wifi driver crashes openwrt device

wifi driver crashes openwrt device

[andy]

hello, every body.
  I developed an openwrt device based on git clone 
git://git.openwrt.org/15.05/openwrt.git.
  I found that my device rebooted during wifi initializing sometimes, maybe 
one in twenty. 
  The wifi driver is compat-wireless-2016-01-10.tar.bz2.
  Could somebody give some hint or help me to resolve this wired issue?
  Thank you very much.

Re: wifi driver crashes openwrt device

[Bob Copeland]

On Tue, May 10, 2016 at 03:17:25PM +0000, andy wrote:
> hello, every body.
>   I developed an openwrt device based on git clone 
> git://git.openwrt.org/15.05/openwrt.git.
>   I found that my device rebooted during wifi initializing sometimes, maybe 
> one in twenty. 
>   The wifi driver is compat-wireless-2016-01-10.tar.bz2.
>   Could somebody give some hint or help me to resolve this wired issue?
>   Thank you very much.

Hi Andy,

You will probably need to capture a stack trace from the device in order
for someone to be able to help, otherwise we can only guess.  A serial
console can help with that.

-- 
Bob Copeland %% http://bobcopeland.com/

Re: wifi driver crashes openwrt device

[Kalle Valo]

Bob Copeland <me@bobcopeland.com> writes:

> On Tue, May 10, 2016 at 03:17:25PM +0000, andy wrote:
>> hello, every body.
>>   I developed an openwrt device based on git clone 
>> git://git.openwrt.org/15.05/openwrt.git.
>>   I found that my device rebooted during wifi initializing sometimes, maybe 
>> one in twenty. 
>>   The wifi driver is compat-wireless-2016-01-10.tar.bz2.
>>   Could somebody give some hint or help me to resolve this wired issue?
>>   Thank you very much.
>
> Hi Andy,
>
> You will probably need to capture a stack trace from the device in order
> for someone to be able to help, otherwise we can only guess.  A serial
> console can help with that.

Didn't openwrt have a some sort ramoops facility to collect the last
kernel logs before a crash? I don't recall the name right now but I'm
pretty sure I used it with one of our APs few years back. That might
help (or not).

-- 
Kalle Valo

Re: wifi driver crashes openwrt device

[Sven Eckelmann]

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On Monday 16 May 2016 14:46:07 Kalle Valo wrote:
[...]
> Didn't openwrt have a some sort ramoops facility to collect the last
> kernel logs before a crash? I don't recall the name right now but I'm
> pretty sure I used it with one of our APs few years back. That might
> help (or not).

He can just check if /sys/kernel/debug/crashlog exists after the device
crashed+rebooted.

I would also be good to have CONFIG_KERNEL_KALLSYMS=y set and compile the
kernel+modules with "KBUILD_CFLAGS	+= -fno-optimize-sibling-calls" to get
a (slightly) readable calltrace on things like MIPS.

Kind regards,
	Sven

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