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Re: crash by cdc_acm driver in kernels 4.8-rc1/5

From Wim Osterholt <wim@djo.tudelft.nl>
Newsgroups linux.kernel
Subject Re: crash by cdc_acm driver in kernels 4.8-rc1/5
Date 2016-09-22 20:00 +0200
Message-ID <skgrU-10r-43@gated-at.bofh.it> (permalink)
References (5 earlier) <sjt7P-3qP-19@gated-at.bofh.it> <sjvsZ-4Ti-1@gated-at.bofh.it> <sjOOZ-vu-1@gated-at.bofh.it> <sjSSC-2Xx-19@gated-at.bofh.it> <skdu2-7CL-23@gated-at.bofh.it>
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> >Please look up the bConfigurationValue for your device
> >in sysfs.

I didn't explicitly say that this was done under kernel-4.7.4, otherwise
it may have been impossible under 4.8 .

On Thu, Sep 22, 2016 at 04:40:50PM +0200, Oliver Neukum wrote:
> 
> OK. Strange. Please do
> 
> dmesg -c
> echo 9 > /proc/sysrq-trigger
> modprobe cdc_acm
> echo "module cdc_acm +mpf" > /sys/kernel/debug/dynamic_debug/control
> 
> [plug your device in]
> 
> and provide the full output of dmesg after that.

You don't state if this must be done in a safe 4.7.4 or a crashable 4.8.
(if I get that far to retrieve dmesg to a file).

Anyway, echo "module cdc_acm +mpf" > /sys/kernel/debug/dynamic_debug/control
results in 'No such file or directory' because there is no 'dynamic_debug'.

The kernel option DYNAMIC_DEBUG was not set.
A new kernel is compiling now..



Groeten, Wim.

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Thread

Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Wim Osterholt <wim@djo.tudelft.nl> - 2016-09-12 04:50 +0200
  Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Oliver Neukum <oneukum@suse.com> - 2016-09-20 15:20 +0200
    Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Wim Osterholt <wim@djo.tudelft.nl> - 2016-09-20 17:50 +0200
      Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Oliver Neukum <oneukum@suse.com> - 2016-09-21 14:30 +0200
        Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Wim Osterholt <wim@djo.tudelft.nl> - 2016-09-21 18:30 +0200
        Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Wim Osterholt <wim@djo.tudelft.nl> - 2016-09-21 18:50 +0200
          Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Oliver Neukum <oneukum@suse.com> - 2016-09-22 16:50 +0200
            Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Wim Osterholt <wim@djo.tudelft.nl> - 2016-09-22 20:00 +0200
            Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Wim Osterholt <wim@djo.tudelft.nl> - 2016-09-22 21:30 +0200
            Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Wim Osterholt <wim@djo.tudelft.nl> - 2016-09-23 12:10 +0200

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