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Re: Anyone else seen this. [Draytek rebooting]

From jkn <jkn+nin@nicorp.co.uk>
Newsgroups comp.os.linux.misc, uk.d-i-y
Subject Re: Anyone else seen this. [Draytek rebooting]
Date 2026-07-04 07:45 +0100
Message-ID <narog4Fmk5tU3@mid.individual.net> (permalink)
References <1128k1p$3fgrb$1@dont-email.me> <naq3o2FolriU1@mid.individual.net> <11298qj$3mlcf$2@dont-email.me> <naqntkFmk5tU1@mid.individual.net> <vIu*0gHKA@news.chiark.greenend.org.uk>

Cross-posted to 2 groups.

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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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Thread

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. 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. 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. "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

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