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Anyone else seen this.

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  Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-03 16:21 +0100
    Re: Anyone else seen this. Andy Burns <usenet@andyburns.uk> - 2026-07-03 16:37 +0100
      Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-03 22:10 +0100
    Re: Anyone else seen this. [Draytek rebooting] jkn <jkn+nin@nicorp.co.uk> - 2026-07-03 16:45 +0100
      Re: Anyone else seen this. [Draytek rebooting] jkn <jkn+nin@nicorp.co.uk> - 2026-07-03 18:52 +0100
        Re: Anyone else seen this. [Draytek rebooting] The Natural Philosopher <tnp@invalid.invalid> - 2026-07-03 22:17 +0100
      Re: Anyone else seen this. [Draytek rebooting] The Natural Philosopher <tnp@invalid.invalid> - 2026-07-03 22:16 +0100
        Re: Anyone else seen this. [Draytek rebooting] jkn <jkn+nin@nicorp.co.uk> - 2026-07-03 22:29 +0100
          Re: Anyone else seen this. [Draytek rebooting] Theo <theom+news@chiark.greenend.org.uk> - 2026-07-04 00:33 +0100
            Re: Anyone else seen this. [Draytek rebooting] jkn <jkn+nin@nicorp.co.uk> - 2026-07-04 07:45 +0100
              Re: Anyone else seen this. [Draytek rebooting] The Natural Philosopher <tnp@invalid.invalid> - 2026-07-04 12:39 +0100
    Re: Anyone else seen this. Theo <theom+news@chiark.greenend.org.uk> - 2026-07-03 17:43 +0100
      Re: Anyone else seen this. Richard Kettlewell <invalid@invalid.invalid> - 2026-07-03 22:09 +0100
        Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-03 22:46 +0100
        Re: Anyone else seen this. Pancho <Pancho.Jones@protonmail.com> - 2026-07-03 23:14 +0100
      Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-03 22:20 +0100
    Re: Anyone else seen this. Adrian <diy@ku.gro.lioff> - 2026-07-03 17:51 +0100
      Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-03 22:26 +0100
    Re: Anyone else seen this. Pancho <Pancho.Jones@protonmail.com> - 2026-07-03 19:28 +0100
      Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-03 22:28 +0100
    Re: Anyone else seen this. "Jeff Gaines" <jgnewsid@outlook.com> - 2026-07-03 19:38 +0000
    Re: Anyone else seen this. John Rumm <see.my.signature@nowhere.null> - 2026-07-03 21:15 +0100
      Re: Anyone else seen this. jkn <jkn+nin@nicorp.co.uk> - 2026-07-03 22:32 +0100
        Re: Anyone else seen this. John Rumm <see.my.signature@nowhere.null> - 2026-07-04 00:30 +0100
          Re: Anyone else seen this. jkn <jkn+nin@nicorp.co.uk> - 2026-07-04 08:55 +0100
            Re: Anyone else seen this. John Rumm <see.my.signature@nowhere.null> - 2026-07-04 12:36 +0100
    Re: Anyone else seen this. Rich <rich@example.invalid> - 2026-07-04 05:30 +0000
    Re: Anyone else seen this. alan_m <junk@admac.myzen.co.uk> - 2026-07-04 11:23 +0100
      Re: Anyone else seen this. Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-07-04 17:06 +0000
        Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-04 19:08 +0100
        Re: Anyone else seen this. c186282 <c186282@nnada.net> - 2026-07-05 02:36 -0400
      Re: Anyone else seen this. tony sayer <tony@bancom.co.uk> - 2026-07-04 22:05 +0100
        Re: Anyone else seen this. jkn <jkn+nin@nicorp.co.uk> - 2026-07-04 23:19 +0100
          Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-05 10:28 +0100
            Re: Anyone else seen this. jkn <jkn+nin@nicorp.co.uk> - 2026-07-05 10:38 +0100
              Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-05 10:53 +0100
                Re: Anyone else seen this. jkn <jkn+nin@nicorp.co.uk> - 2026-07-05 19:24 +0100
                  Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-05 23:55 +0100
            Re: Anyone else seen this. alan_m <junk@admac.myzen.co.uk> - 2026-07-05 12:05 +0100
              Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-05 13:57 +0100
          Re: Anyone else seen this. tony sayer <tony@bancom.co.uk> - 2026-07-06 13:01 +0100
            Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-06 13:15 +0100
              Re: Anyone else seen this. Rich <rich@example.invalid> - 2026-07-06 14:15 +0000
                Re: Anyone else seen this. "Carlos E. R." <robin_listas@es.invalid> - 2026-07-06 20:00 +0200
                  Re: Anyone else seen this. Rich <rich@example.invalid> - 2026-07-06 19:55 +0000
                Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-07 09:12 +0100
        Re: Anyone else seen this. alan_m <junk@admac.myzen.co.uk> - 2026-07-05 09:18 +0100
          Re: Anyone else seen this. jkn <jkn+nin@nicorp.co.uk> - 2026-07-05 10:40 +0100
            Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-05 10:54 +0100
              Re: Anyone else seen this. tony sayer <tony@bancom.co.uk> - 2026-07-06 13:06 +0100
                Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-06 13:18 +0100
            Re: Anyone else seen this. alan_m <junk@admac.myzen.co.uk> - 2026-07-05 12:32 +0100
              Re: Anyone else seen this. jkn <jkn+nin@nicorp.co.uk> - 2026-07-05 17:24 +0100
          Re: Anyone else seen this. c186282 <c186282@nnada.net> - 2026-07-06 00:49 -0400
            Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-06 12:24 +0100
    Re: Anyone else seen this. "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2026-07-04 21:52 +0800
      Re: Anyone else seen this. c186282 <c186282@nnada.net> - 2026-07-04 23:34 -0400
        Re: Anyone else seen this. The Natural Philosopher <tnp@invalid.invalid> - 2026-07-05 10:50 +0100

Page 1 of 3  [1] 2 3  Next page →

#88607 — Anyone else seen this.

Recently my router (Draytek 2726) has been spontaneously rebooting.

Examination of the logs show a kernel panic caused by 'attempt to 
execute an illegal instruction'.

My assumption, possibly erroneous, is that the actual firmware code is 
corrupted
The router is rated only to +45°C but that is the recommended limit for 
flash memory, and the room temperature has been up towards 40°C. which 
doesn't leave a great deal of margin for router internal heat production.
My query is whether anyone else has seen issues with flash memory in the 
recent hear wave.

Surely phones get hotter than this?

Genuinely interested in other's experiences.

-- 
Karl Marx said religion is the opium of the people.
But Marxism is the crack cocaine.

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#88608

The Natural Philosopher wrote:

> Recently my router (Draytek 2726) has been spontaneously rebooting.

Don't think my 2865 has, have you been keeping up with recent firmware 
fixes?

> Examination of the logs show a kernel panic caused by 'attempt to 
> execute an illegal instruction'.
> 
> My assumption, possibly erroneous, is that the actual firmware code is 
> corrupted
> The router is rated only to +45°C but that is the recommended limit for 
> flash memory, and the room temperature has been up towards 40°C. which 
> doesn't leave a great deal of margin for router internal heat production.
> My query is whether anyone else has seen issues with flash memory in the 
> recent hear wave.
> 
> Surely phones get hotter than this?

I sat my phone on my thunderbolt dock while it was charging, and it 
complained the battery was getting too hot and stopped the charge.

> Genuinely interested in other's experiences.


Just checked, uptime is nearly 2 months, which roughly corresponds to 
the most recent draytek downloads on my laptop.

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#88617

On 03/07/2026 16:37, Andy Burns wrote:
> The Natural Philosopher wrote:
> 
>> Recently my router (Draytek 2726) has been spontaneously rebooting.
> 
> Don't think my 2865 has, have you been keeping up with recent firmware 
> fixes?
> 
Yes

>> Examination of the logs show a kernel panic caused by 'attempt to 
>> execute an illegal instruction'.
>>
>> My assumption, possibly erroneous, is that the actual firmware code is 
>> corrupted
>> The router is rated only to +45°C but that is the recommended limit 
>> for flash memory, and the room temperature has been up towards 40°C. 
>> which doesn't leave a great deal of margin for router internal heat 
>> production.
>> My query is whether anyone else has seen issues with flash memory in 
>> the recent hear wave.
>>
>> Surely phones get hotter than this?
> 
> I sat my phone on my thunderbolt dock while it was charging, and it 
> complained the battery was getting too hot and stopped the charge.
> 
>> Genuinely interested in other's experiences.
> 
> 
> Just checked, uptime is nearly 2 months, which roughly corresponds to 
> the most recent draytek downloads on my laptop.
> 
> 

Normally that router is flawless. stays up till the next power cut of 
system upgrade.

Ive reflashed the same firmware. Its the latest. We will see.


-- 
“The ultimate result of shielding men from the effects of folly is to 
fill the world with fools.”

Herbert Spencer

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#88609 — Re: Anyone else seen this. [Draytek rebooting]

On 03/07/2026 16:21, The Natural Philosopher wrote:
> Recently my router (Draytek 2726) has been spontaneously rebooting.
> 
> Examination of the logs show a kernel panic caused by 'attempt to 
> execute an illegal instruction'.
> 
> My assumption, possibly erroneous, is that the actual firmware code is 
> corrupted
> The router is rated only to +45°C but that is the recommended limit for 
> flash memory, and the room temperature has been up towards 40°C. which 
> doesn't leave a great deal of margin for router internal heat production.
> My query is whether anyone else has seen issues with flash memory in the 
> recent hear wave.
> 
> Surely phones get hotter than this?
> 
> Genuinely interested in other's experiences.
> 

I have a Draytek 2927 series - it is not new to me, but was previously 
used in a commercial environment with no issues AFAIK.

I have noticed a situation with mine where the connection both wired and 
wireless) appears to drop momentarily, on occasion (couple of times a week?)

I recently looked at the log, and saw something similar to what you 
describe - the router was in fact rebooting, and the log shows something 
like:

 > sys ver dbg

Router Model: Vigor2927ax    Version: 4.5.2 English
Profile version: 4.0.0    Status: 1 (0x9de71d0f)
Router IP: 192.168.0.1    Netmask: 255.255.255.0
Firmware Build Date/Time: Feb 12 2026 17:45:01
Router Name: DrayTek
Revision: 6562_fd593bfca2 drayos2015
Router serial no: None

---------firmware exception debug info on cpu0-----------------------------

# etc.

There are a few Draytek support pages around this, and typically they 
want to blame the PSU. My PSU is not the original Draytek, but can 
supply substantially more current - 4.5A IIRC, so I doubt that is the
issue.

My router is not in one of the hotter places in the house. I have just 
felt it now, it is pretty warm though. I may try to lift it up off the 
shelf it sits one, for more airflow, to see if that makes a difference

(I should say that I think my issue has pre-dated the recent heatwaves)

     J^n

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#88612 — Re: Anyone else seen this. [Draytek rebooting]

PS:
	my router rebooting seems to happen more often when I power up a 
laptop, ie. new WiFi connection(s) have to be made.

This lends some credence to the idea of it being a PSU issue, at least 
in my case. But as I say, I have an overrated PSU connected. Perhaps I 
will try the original Draytek one, as an experiment...

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#88619 — Re: Anyone else seen this. [Draytek rebooting]

On 03/07/2026 18:52, jkn wrote:
> PS:
>      my router rebooting seems to happen more often when I power up a 
> laptop, ie. new WiFi connection(s) have to be made.
> 
> This lends some credence to the idea of it being a PSU issue, at least 
> in my case. But as I say, I have an overrated PSU connected. Perhaps I 
> will try the original Draytek one, as an experiment...
> 

Well I reflashed my firmware. We will see. The router was not doing 
anything special at the time.

-- 
In todays liberal progressive conflict-free education system, everyone 
gets full Marx.

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#88618 — Re: Anyone else seen this. [Draytek rebooting]

On 03/07/2026 16:45, jkn wrote:
> On 03/07/2026 16:21, The Natural Philosopher wrote:
>> Recently my router (Draytek 2726) has been spontaneously rebooting.
>>
>> Examination of the logs show a kernel panic caused by 'attempt to 
>> execute an illegal instruction'.
>>
>> My assumption, possibly erroneous, is that the actual firmware code is 
>> corrupted
>> The router is rated only to +45°C but that is the recommended limit 
>> for flash memory, and the room temperature has been up towards 40°C. 
>> which doesn't leave a great deal of margin for router internal heat 
>> production.
>> My query is whether anyone else has seen issues with flash memory in 
>> the recent hear wave.
>>
>> Surely phones get hotter than this?
>>
>> Genuinely interested in other's experiences.
>>
> 
> I have a Draytek 2927 series - it is not new to me, but was previously 
> used in a commercial environment with no issues AFAIK.
> 
> I have noticed a situation with mine where the connection both wired and 
> wireless) appears to drop momentarily, on occasion (couple of times a 
> week?)
> 
> I recently looked at the log, and saw something similar to what you 
> describe - the router was in fact rebooting, and the log shows something 
> like:
> 
>  > sys ver dbg
> 
> Router Model: Vigor2927ax    Version: 4.5.2 English
> Profile version: 4.0.0    Status: 1 (0x9de71d0f)
> Router IP: 192.168.0.1    Netmask: 255.255.255.0
> Firmware Build Date/Time: Feb 12 2026 17:45:01
> Router Name: DrayTek
> Revision: 6562_fd593bfca2 drayos2015
> Router serial no: None
> 
> ---------firmware exception debug info on cpu0-----------------------------
> 
> # etc.
> 
Yes. that is significant. Its the next bit of the log before the 
registers dump that is significant

Mine said (in shorthand) 'The CPU tried to execute an instruction that 
does not exist'

My tentative conclusion was that the firmware in flash was corrupted.


> There are a few Draytek support pages around this, and typically they 
> want to blame the PSU. My PSU is not the original Draytek, but can 
> supply substantially more current - 4.5A IIRC, so I doubt that is the
> issue.
>

  Mine is original and has given no trouble before

> My router is not in one of the hotter places in the house. I have just 
> felt it now, it is pretty warm though. I may try to lift it up off the 
> shelf it sits one, for more airflow, to see if that makes a difference
> 
> (I should say that I think my issue has pre-dated the recent heatwaves)
> 
Although I am on FTTP mine is still plugged into the phone line - there 
have been storms...

>      J^n
> 

-- 
In todays liberal progressive conflict-free education system, everyone 
gets full Marx.

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#88623 — Re: Anyone else seen this. [Draytek rebooting]

On 03/07/2026 22:16, The Natural Philosopher wrote:
> On 03/07/2026 16:45, jkn wrote:
>> On 03/07/2026 16:21, The Natural Philosopher wrote:
>>> Recently my router (Draytek 2726) has been spontaneously rebooting.
>>>
>>> Examination of the logs show a kernel panic caused by 'attempt to 
>>> execute an illegal instruction'.
>>>
>>> My assumption, possibly erroneous, is that the actual firmware code 
>>> is corrupted
>>> The router is rated only to +45°C but that is the recommended limit 
>>> for flash memory, and the room temperature has been up towards 40°C. 
>>> which doesn't leave a great deal of margin for router internal heat 
>>> production.
>>> My query is whether anyone else has seen issues with flash memory in 
>>> the recent hear wave.
>>>
>>> Surely phones get hotter than this?
>>>
>>> Genuinely interested in other's experiences.
>>>
>>
>> I have a Draytek 2927 series - it is not new to me, but was previously 
>> used in a commercial environment with no issues AFAIK.
>>
>> I have noticed a situation with mine where the connection both wired 
>> and wireless) appears to drop momentarily, on occasion (couple of 
>> times a week?)
>>
>> I recently looked at the log, and saw something similar to what you 
>> describe - the router was in fact rebooting, and the log shows 
>> something like:
>>
>>  > sys ver dbg
>>
>> Router Model: Vigor2927ax    Version: 4.5.2 English
>> Profile version: 4.0.0    Status: 1 (0x9de71d0f)
>> Router IP: 192.168.0.1    Netmask: 255.255.255.0
>> Firmware Build Date/Time: Feb 12 2026 17:45:01
>> Router Name: DrayTek
>> Revision: 6562_fd593bfca2 drayos2015
>> Router serial no: None
>>
>> ---------firmware exception debug info on 
>> cpu0-----------------------------
>>
>> # etc.
>>
> Yes. that is significant. Its the next bit of the log before the 
> registers dump that is significant
> 
> Mine said (in shorthand) 'The CPU tried to execute an instruction that 
> does not exist'
> 

Yes, my log has:

---------firmware exception debug info on cpu0-----------------------------
  EPC=60034b60, Cause=00800014, Status=1100fc03, BadAddr=00000000, 
RetAddr=60034a58
  exception id=5(ADES: Address Error Store)
  exception occured in TASK Level
  task_id=161, SP=0x629390b8(3188 bytes free, 5664 used bytes)
  system tick =26381273
  CURRENT_VERSION : 4.5.2_RC5
  get from address : 60017000
  Dump CPU0 registers:
...


but if you look eg. here:

https://www.draytek.co.uk/support/guides/kb-troubleshoot-reboot

they list a log like this - this seems a 'normal' feature of reboot 
issues, without considering flash failure.

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#88628 — Re: Anyone else seen this. [Draytek rebooting]

In uk.d-i-y jkn <jkn+nin@nicorp.co.uk> wrote:
> On 03/07/2026 22:16, The Natural Philosopher wrote:
> > On 03/07/2026 16:45, jkn wrote:
> >> On 03/07/2026 16:21, The Natural Philosopher wrote:
> >>> Recently my router (Draytek 2726) has been spontaneously rebooting.
> >>>
> >>> Examination of the logs show a kernel panic caused by 'attempt to 
> >>> execute an illegal instruction'.
> >>>
> >>> My assumption, possibly erroneous, is that the actual firmware code 
> >>> is corrupted
> >>> The router is rated only to +45°C but that is the recommended limit 
> >>> for flash memory, and the room temperature has been up towards 40°C. 
> >>> which doesn't leave a great deal of margin for router internal heat 
> >>> production.
> >>> My query is whether anyone else has seen issues with flash memory in 
> >>> the recent hear wave.
> >>>
> >>> Surely phones get hotter than this?
> >>>
> >>> Genuinely interested in other's experiences.
> >>>
> >>
> >> I have a Draytek 2927 series - it is not new to me, but was previously 
> >> used in a commercial environment with no issues AFAIK.
> >>
> >> I have noticed a situation with mine where the connection both wired 
> >> and wireless) appears to drop momentarily, on occasion (couple of 
> >> times a week?)
> >>
> >> I recently looked at the log, and saw something similar to what you 
> >> describe - the router was in fact rebooting, and the log shows 
> >> something like:
> >>
> >>  > sys ver dbg
> >>
> >> Router Model: Vigor2927ax    Version: 4.5.2 English
> >> Profile version: 4.0.0    Status: 1 (0x9de71d0f)
> >> Router IP: 192.168.0.1    Netmask: 255.255.255.0
> >> Firmware Build Date/Time: Feb 12 2026 17:45:01
> >> Router Name: DrayTek
> >> Revision: 6562_fd593bfca2 drayos2015
> >> Router serial no: None
> >>
> >> ---------firmware exception debug info on 
> >> cpu0-----------------------------
> >>
> >> # etc.
> >>
> > Yes. that is significant. Its the next bit of the log before the 
> > registers dump that is significant
> > 
> > Mine said (in shorthand) 'The CPU tried to execute an instruction that 
> > does not exist'
> > 
> 
> Yes, my log has:
> 
> ---------firmware exception debug info on cpu0-----------------------------
>   EPC=60034b60, Cause=00800014, Status=1100fc03, BadAddr=00000000, 
> RetAddr=60034a58
>   exception id=5(ADES: Address Error Store)
>   exception occured in TASK Level
>   task_id=161, SP=0x629390b8(3188 bytes free, 5664 used bytes)
>   system tick =26381273
>   CURRENT_VERSION : 4.5.2_RC5
>   get from address : 60017000
>   Dump CPU0 registers:
> ...
> 
> 
> but if you look eg. here:
> 
> https://www.draytek.co.uk/support/guides/kb-troubleshoot-reboot
> 
> they list a log like this - this seems a 'normal' feature of reboot 
> issues, without considering flash failure.

That looks like MIPS. The Cause register bits 2-6 gives you the type of
exception. For yours:

Cause[6:2] = 5 which means 'Store to illegal address'

TNP's has:

Cause[6:2] = 10 which means 'Reserved instruction'

codes from:
http://www.cs.iit.edu/~virgil/cs470/Labs/Lab7.pdf

They are different types of exception, even if the information is presented
in the same way.

Theo

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#88632 — Re: Anyone else seen this. [Draytek rebooting]

On 04/07/2026 00:33, Theo wrote:
> In uk.d-i-y jkn <jkn+nin@nicorp.co.uk> wrote:
>> On 03/07/2026 22:16, The Natural Philosopher wrote:
>>> On 03/07/2026 16:45, jkn wrote:
>>>> On 03/07/2026 16:21, The Natural Philosopher wrote:
>>>>> Recently my router (Draytek 2726) has been spontaneously rebooting.
>>>>>
>>>>> Examination of the logs show a kernel panic caused by 'attempt to
>>>>> execute an illegal instruction'.
>>>>>
>>>>> My assumption, possibly erroneous, is that the actual firmware code
>>>>> is corrupted
>>>>> The router is rated only to +45°C but that is the recommended limit
>>>>> for flash memory, and the room temperature has been up towards 40°C.
>>>>> which doesn't leave a great deal of margin for router internal heat
>>>>> production.
>>>>> My query is whether anyone else has seen issues with flash memory in
>>>>> the recent hear wave.
>>>>>
>>>>> Surely phones get hotter than this?
>>>>>
>>>>> Genuinely interested in other's experiences.
>>>>>
>>>>
>>>> I have a Draytek 2927 series - it is not new to me, but was previously
>>>> used in a commercial environment with no issues AFAIK.
>>>>
>>>> I have noticed a situation with mine where the connection both wired
>>>> and wireless) appears to drop momentarily, on occasion (couple of
>>>> times a week?)
>>>>
>>>> I recently looked at the log, and saw something similar to what you
>>>> describe - the router was in fact rebooting, and the log shows
>>>> something like:
>>>>
>>>>   > sys ver dbg
>>>>
>>>> Router Model: Vigor2927ax    Version: 4.5.2 English
>>>> Profile version: 4.0.0    Status: 1 (0x9de71d0f)
>>>> Router IP: 192.168.0.1    Netmask: 255.255.255.0
>>>> Firmware Build Date/Time: Feb 12 2026 17:45:01
>>>> Router Name: DrayTek
>>>> Revision: 6562_fd593bfca2 drayos2015
>>>> Router serial no: None
>>>>
>>>> ---------firmware exception debug info on
>>>> cpu0-----------------------------
>>>>
>>>> # etc.
>>>>
>>> Yes. that is significant. Its the next bit of the log before the
>>> registers dump that is significant
>>>
>>> Mine said (in shorthand) 'The CPU tried to execute an instruction that
>>> does not exist'
>>>
>>
>> Yes, my log has:
>>
>> ---------firmware exception debug info on cpu0-----------------------------
>>    EPC=60034b60, Cause=00800014, Status=1100fc03, BadAddr=00000000,
>> RetAddr=60034a58
>>    exception id=5(ADES: Address Error Store)
>>    exception occured in TASK Level
>>    task_id=161, SP=0x629390b8(3188 bytes free, 5664 used bytes)
>>    system tick =26381273
>>    CURRENT_VERSION : 4.5.2_RC5
>>    get from address : 60017000
>>    Dump CPU0 registers:
>> ...
>>
>>
>> but if you look eg. here:
>>
>> https://www.draytek.co.uk/support/guides/kb-troubleshoot-reboot
>>
>> they list a log like this - this seems a 'normal' feature of reboot
>> issues, without considering flash failure.
> 
> That looks like MIPS. The Cause register bits 2-6 gives you the type of
> exception. For yours:
> 
> Cause[6:2] = 5 which means 'Store to illegal address'
> 
> TNP's has:
> 
> Cause[6:2] = 10 which means 'Reserved instruction'
> 
> codes from:
> http://www.cs.iit.edu/~virgil/cs470/Labs/Lab7.pdf
> 
> They are different types of exception, even if the information is presented
> in the same way.
> 
> Theo

Agreed - but my point was, PSU issues could cause any or all of these...

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#88637 — Re: Anyone else seen this. [Draytek rebooting]

On 04/07/2026 07:45, jkn wrote:
> Agreed - but my point was, PSU issues could cause any or all of these...

PSU is original and I have no particular reason to think its degraded

However, point taken.

-- 
“Progress is precisely that which rules and regulations did not foresee,”

  – Ludwig von Mises

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#88610

In uk.d-i-y The Natural Philosopher <tnp@invalid.invalid> wrote:
> Recently my router (Draytek 2726) has been spontaneously rebooting.
> 
> Examination of the logs show a kernel panic caused by 'attempt to 
> execute an illegal instruction'.
> 
> My assumption, possibly erroneous, is that the actual firmware code is 
> corrupted
> The router is rated only to +45°C but that is the recommended limit for 
> flash memory, and the room temperature has been up towards 40°C. which 
> doesn't leave a great deal of margin for router internal heat production.
> My query is whether anyone else has seen issues with flash memory in the 
> recent hear wave.
> 
> Surely phones get hotter than this?
> 
> Genuinely interested in other's experiences.

You can get bit flips from cosmic rays.  That's a reason servers have ECC
memory:

https://en.wikipedia.org/wiki/Soft_error

Not sure to what extent flash is affected, but many routers nowadays copy
their OS into RAM before execution: 'execute in place' is still possible,
but sometimes they store a compressed image in flash to reduce flash cost
and decompress into RAM on boot.

It could also be a RAM chip on the way out.

Theo

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#88616

Theo <theom+news@chiark.greenend.org.uk> writes:
> In uk.d-i-y The Natural Philosopher <tnp@invalid.invalid> wrote:
>> Recently my router (Draytek 2726) has been spontaneously rebooting.
>> 
>> Examination of the logs show a kernel panic caused by 'attempt to 
>> execute an illegal instruction'.
>> 
>> My assumption, possibly erroneous, is that the actual firmware code is 
>> corrupted
>> The router is rated only to +45°C but that is the recommended limit for 
>> flash memory, and the room temperature has been up towards 40°C. which 
>> doesn't leave a great deal of margin for router internal heat production.
>> My query is whether anyone else has seen issues with flash memory in the 
>> recent hear wave.
>> 
>> Surely phones get hotter than this?
>> 
>> Genuinely interested in other's experiences.

No computer misbehavior here.

> You can get bit flips from cosmic rays.  That's a reason servers have ECC
> memory:
>
> https://en.wikipedia.org/wiki/Soft_error

If the behavior is consistent across reboot that suggests a problem
somewhere more persistent than RAM. Flash corruption would be my first
guess.

> Not sure to what extent flash is affected, but many routers nowadays copy
> their OS into RAM before execution: 'execute in place' is still possible,
> but sometimes they store a compressed image in flash to reduce flash cost
> and decompress into RAM on boot.

Page caching can make RAM corruption very persistent (albeit not across
a reboot). A while back chiark’s /bin/cat developed a single-bit error
in the cached copy of the code section, which was used (without
reloading) every time it is executed.

> It could also be a RAM chip on the way out.

-- 
https://www.greenend.org.uk/rjk/

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#88625

On 03/07/2026 22:09, Richard Kettlewell wrote:
> If the behavior is consistent across reboot that suggests a problem
> somewhere more persistent than RAM. Flash corruption would be my first
> guess.

Yes. This is the debug output
This error seems not uncommon found half a dozen examples of it reported

 From the  console:

Type ? for command help
 > sys ver dbg

Router Model: Vigor2762Vac    Version: 3.9.9.5_BT English
Profile version: 3.0.0    Status: 1 (0xb1d7bc56)
Router IP: 192.168.0.254    Netmask: 255.255.255.0
Firmware Build Date/Time: Nov 12 2025 11:09:16
Router Name: DrayTek
Revision: 24438_1228_23c13bbb0d V385
Current ADSL Firmware Version: 07-07-03-0F-00-01 Annex A
ADSL Firmware Version: 07-07-03-0F-00-01 Annex A
VDSL2 Firmware Version: 07-07-09-05-01-07
Router serial no: 185003615566

---------firmware exception debug info-----------------------------
  EPC=80b3397c, Cause=80800028, Status=1100fc03, BadAddr=0000000c, 
RetAddr=80b3397c
  exception id=10(RI: Reserved Instruction)
  exception occured in IdleTask Timeout
  task_id=110, SP=0x81de1980(3178 bytes free, 5704 used bytes)
  system tick =3060436
  CURRENT_VERSION : 3.9.9.5_B
  get from address : 80004000
  Dump CPU registers:
-----------------------------------------
  $ 0: 00000000 fffffffe 846f7c00 00000d85
  $ 4: 00000d85 00000001 00000700 00000004
  $ 8: 81de1340 00000001 00000002 afbf0000
  $12: 81de1958 80ff2000 00000000 653a3230
  $16: 0000000c 000003a6 83687680 00001438
  $20: 83960200 81de1e58 824f9573 00000000
  $24: 00000010 00000030 000003a6 00000000
  $28: 815e2e40 81de1980 00000230 80b3397c
List a possible caller functions:
----------------------------------
  func( 0)=80b318b0
  func( 1)=8097d660
  func( 2)=8097fde8
List backtrace functions:
----------------------------------
  func( 0)=80b3397c
  func( 1)=80b318b0
  func( 2)=8097d660
  func( 3)=8097fde8
 >
-- 
"It is an established fact to 97% confidence limits that left wing 
conspirators see right wing conspiracies everywhere"

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#88626

On 7/3/26 22:09, Richard Kettlewell wrote:
ed image in flash to reduce flash cost
>> and decompress into RAM on boot.
> 
> Page caching can make RAM corruption very persistent (albeit not across
> a reboot). A while back chiark’s /bin/cat developed a single-bit error
> in the cached copy of the code section, which was used (without
> reloading) every time it is executed.
> 

vmtouch?

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#88620

On 03/07/2026 17:43, Theo wrote:
> In uk.d-i-y The Natural Philosopher <tnp@invalid.invalid> wrote:
>> Recently my router (Draytek 2726) has been spontaneously rebooting.
>>
>> Examination of the logs show a kernel panic caused by 'attempt to
>> execute an illegal instruction'.
>>
>> My assumption, possibly erroneous, is that the actual firmware code is
>> corrupted
>> The router is rated only to +45°C but that is the recommended limit for
>> flash memory, and the room temperature has been up towards 40°C. which
>> doesn't leave a great deal of margin for router internal heat production.
>> My query is whether anyone else has seen issues with flash memory in the
>> recent hear wave.
>>
>> Surely phones get hotter than this?
>>
>> Genuinely interested in other's experiences.
> 
> You can get bit flips from cosmic rays.  That's a reason servers have ECC
> memory:
> 
> https://en.wikipedia.org/wiki/Soft_error
> 
> Not sure to what extent flash is affected, but many routers nowadays copy
> their OS into RAM before execution: 'execute in place' is still possible,
> but sometimes they store a compressed image in flash to reduce flash cost
> and decompress into RAM on boot.

Well its rebooted and then done it again a few hours later. That doesn't 
rule out dodgy RAM but it inclines towards Flash,,,
> 
> It could also be a RAM chip on the way out.
> 
Very interesting possibility..

> Theo

-- 
“it should be clear by now to everyone that activist environmentalism 
(or environmental activism) is becoming a general ideology about humans, 
about their freedom, about the relationship between the individual and 
the state, and about the manipulation of people under the guise of a 
'noble' idea. It is not an honest pursuit of 'sustainable development,' 
a matter of elementary environmental protection, or a search for 
rational mechanisms designed to achieve a healthy environment. Yet 
things do occur that make you shake your head and remind yourself that 
you live neither in Joseph Stalin’s Communist era, nor in the Orwellian 
utopia of 1984.”

Vaclav Klaus

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#88611

In message <1128k1p$3fgrb$1@dont-email.me>, The Natural Philosopher 
<tnp@invalid.invalid> writes
>Recently my router (Draytek 2726) has been spontaneously rebooting.
>
>Examination of the logs show a kernel panic caused by 'attempt to 
>execute an illegal instruction'.
>
>My assumption, possibly erroneous, is that the actual firmware code is 
>corrupted
>The router is rated only to +45°C but that is the recommended limit for 
>flash memory, and the room temperature has been up towards 40°C. which 
>doesn't leave a great deal of margin for router internal heat 
>production.
>My query is whether anyone else has seen issues with flash memory in 
>the recent hear wave.
>
>Surely phones get hotter than this?
>
>Genuinely interested in other's experiences.
>

I've got a Vigor 2865 which rebooted a week or so back, there wasn't a 
power cut, so I'm assuming that the router did it itself.  I thought I 
had logging turned on, but apparently not.

The room it is in doesn't get that warm (upper 20s at the time).

Adrian
-- 
To Reply :
replace "diy" with "news" and reverse the domain

If you are reading this from a web interface e.g. DIY Banter or DIY Forum,
please be aware this is NOT a forum, and you are merely using a web portal
to a USENET group. Many people block posters coming from web portals due to
perceieved SPAM or inaneness.
For a better method of access, please see:

http://wiki.diyfaq.org.uk/index.php?title=Usenet

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#88621

On 03/07/2026 17:51, Adrian wrote:
> In message <1128k1p$3fgrb$1@dont-email.me>, The Natural Philosopher 
> <tnp@invalid.invalid> writes
>> Recently my router (Draytek 2726) has been spontaneously rebooting.
>>
>> Examination of the logs show a kernel panic caused by 'attempt to 
>> execute an illegal instruction'.
>>
>> My assumption, possibly erroneous, is that the actual firmware code is 
>> corrupted
>> The router is rated only to +45°C but that is the recommended limit 
>> for flash memory, and the room temperature has been up towards 40°C. 
>> which doesn't leave a great deal of margin for router internal heat 
>> production.
>> My query is whether anyone else has seen issues with flash memory in 
>> the recent hear wave.
>>
>> Surely phones get hotter than this?
>>
>> Genuinely interested in other's experiences.
>>
> 
> I've got a Vigor 2865 which rebooted a week or so back, there wasn't a 
> power cut, so I'm assuming that the router did it itself.  I thought I 
> had logging turned on, but apparently not.
> 
You can use the systems internal crash log..

full instructions here
https://www.draytek.co.uk/support/guides/kb-troubleshoot-reboot

> The room it is in doesn't get that warm (upper 20s at the time).
> 
Could be Tham Thar Kosmik Rays...

Aren't we (solar system) moving into  an area of higher galactic radiation?

> Adrian

It's comforting to know that other people have had this happen.
-- 
The difference bweteen a psychopath and a saint is that the psychpoath 
takes what he can and gives only what he must, but the saint gives 
everything he can and takes only what he needs.

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#88613

On 7/3/26 16:21, The Natural Philosopher wrote:
> Recently my router (Draytek 2726) has been spontaneously rebooting.
> 
> Examination of the logs show a kernel panic caused by 'attempt to 
> execute an illegal instruction'.
> 
> My assumption, possibly erroneous, is that the actual firmware code is 
> corrupted
> The router is rated only to +45°C but that is the recommended limit for 
> flash memory, and the room temperature has been up towards 40°C. which 
> doesn't leave a great deal of margin for router internal heat production.
> My query is whether anyone else has seen issues with flash memory in the 
> recent hear wave.
> 
> Surely phones get hotter than this?
> 
> Genuinely interested in other's experiences.
> 

Dunno about any of that but my VDSL modem crashes in warm weather. 
Taking the board out of the plastic case and blowing a USB desk fan 
across it seems to sort it out.

This year it pissed me off enough to order FTTH.

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#88622

On 03/07/2026 19:28, Pancho wrote:
> On 7/3/26 16:21, The Natural Philosopher wrote:
>> Recently my router (Draytek 2726) has been spontaneously rebooting.
>>
>> Examination of the logs show a kernel panic caused by 'attempt to 
>> execute an illegal instruction'.
>>
>> My assumption, possibly erroneous, is that the actual firmware code is 
>> corrupted
>> The router is rated only to +45°C but that is the recommended limit 
>> for flash memory, and the room temperature has been up towards 40°C. 
>> which doesn't leave a great deal of margin for router internal heat 
>> production.
>> My query is whether anyone else has seen issues with flash memory in 
>> the recent hear wave.
>>
>> Surely phones get hotter than this?
>>
>> Genuinely interested in other's experiences.
>>
> 
> Dunno about any of that but my VDSL modem crashes in warm weather. 

Mine used to crash and stay crashed after local thinderstoms

> Taking the board out of the plastic case and blowing a USB desk fan 
> across it seems to sort it out.
> 
> This year it pissed me off enough to order FTTH.
I've had one genuine outage on mine. In a couple of years. Sometimes it 
flaps for a second or two, but compared to ADSL its magic

-- 
It is the folly of too many to mistake the echo of a London coffee-house 
for the voice of the kingdom.

Jonathan Swift

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