linux-kernel - Re: 3.13.5 : rm -rf running forever, one cpu at approx 100%

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Message-Id: <201402270630.05236.gheskett@wdtv.com>
Date:	Thu, 27 Feb 2014 06:30:04 -0500
From:	Gene Heskett <gheskett@...v.com>
To:	Mike Galbraith <bitbucket@...ine.de>
Cc:	Ken Moffat <zarniwhoop@...world.com>, linux-kernel@...r.kernel.org
Subject: Re: 3.13.5 : rm -rf running forever, one cpu at approx 100%

On Wednesday 26 February 2014, Mike Galbraith wrote:
>On Thu, 2014-02-27 at 03:45 +0000, Ken Moffat wrote:
>> On Thu, Feb 27, 2014 at 04:26:35AM +0100, Mike Galbraith wrote:
>> > I would start with strace to see if a task is looping in userspace,
>> > then move on to perf top -g -p <pid> (or perf record/report) to peek
>> > at what it's up to in the kernel.  Once you have the where,
>> > trace_printk() is the best thing since sliced bread (which ranks
>> > just below printk()).
>> > 
>> > -Mike
>>  
>>  Thanks.  I'll need to build perf.
>
>You may want to build the kernel with frame-pointers too, for easy gdb
>list *0x(hexnum) of *func()+0x(hexoffset) use.  Crash is also pretty
>handy both for rummaging live via crash vmlinux /proc/kcore, and for
>leisurely postmortem analysis if you set the box up to crashdump in
>advance, and force a dump (poke sysrq-c or echo c > /proc/sysrq-trigger)
>when you see the bad thing happen.  Crash has all kinds of goodies,
>including invocation of gdb.
>
>-Mike

It doesn't look as if I'll have to guys.  Amanda is about 1/2 done and 
running normally by switching from tar-1.22 to tar-1.27.  So I'm going to 
toddle off in the general direction of a bed and let amanda send me an 
email when its done.

And it did, including some "strange" reports I have yet to decipher. Diffs 
in the tar's probably.  But it did not hang.

Cheers, Gene
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>

NOTICE: Will pay 100 USD for an HP-4815A defective but
complete probe assembly.

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