From: Richard Weinberger <richard@nod.at>
To: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: viro@zeniv.linux.org.uk, akpm@linux-foundation.org,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH][Resend v2] Fix infinite loop in search_binary_handler()
Date: Tue, 5 Jul 2011 00:17:29 +0200 [thread overview]
Message-ID: <201107050017.30365.richard@nod.at> (raw)
In-Reply-To: <201107050703.EGJ13561.OFQHOOVMJtLFSF@I-love.SAKURA.ne.jp>
Am Dienstag 05 Juli 2011, 00:03:47 schrieb Tetsuo Handa:
> Richard Weinberger wrote:
> > Am Montag 04 Juli 2011, 16:59:32 schrieb Richard Weinberger:
> > > Here the second boot log:
> > > http://userweb.kernel.org/~rw/boot2.log
> > >
> > > The interesting part is:
> > > ---cut---
> > > VFS: Mounted root (ext2 filesystem) readonly on device 98:0.
> > > Calling request_module() swapper 1 /sbin/init 1 3
> > > Calling request_module() kworker/u:0 211 /sbin/modprobe 4 3
> > > ...
> > > Calling request_module() kworker/u:0 8741 /sbin/modprobe 4 3
> > > ---cut---
> > >
> > > After the last "Calling request_module..." message no more messages
> > > appear and the kernel seems to loop for ever.
> >
> > Please ignore this.
> > The "Calling request_module..." messages continue for ever.
> > In the first case my terminal locked up...
> > current->pid also wraps around.
>
> Please note that the each PID is printed for twice.
> This means that each thread within the loop tries to create a thread.
> Therefore, it will repeat for (1 << MAX_KMOD_CONCURRENT) times.
> It is large enough to wrap the PID.
> Well, try with smaller MAX_KMOD_CONCURRENT (e.g. 3).
>
With MAX_KMOD_CONCURRENT=3 it takes only a few seconds until
the modprobe storm ends.
How shall we proceed?
Applying my ad-hoc patch
or lowering MAX_KMOD_CONCURRENT?
Thanks,
//richard
next prev parent reply other threads:[~2011-07-04 22:17 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-04 11:30 [PATCH][Resend v2] Fix infinite loop in search_binary_handler() Richard Weinberger
2011-07-04 11:51 ` Tetsuo Handa
2011-07-04 11:57 ` Richard Weinberger
2011-07-04 12:10 ` Tetsuo Handa
2011-07-04 12:20 ` Richard Weinberger
2011-07-04 14:42 ` Tetsuo Handa
2011-07-04 14:59 ` Richard Weinberger
2011-07-04 15:07 ` Richard Weinberger
2011-07-04 22:03 ` Tetsuo Handa
2011-07-04 22:17 ` Richard Weinberger [this message]
2011-07-05 1:24 ` Tetsuo Handa
2011-07-05 9:55 ` Richard Weinberger
2011-07-05 12:02 ` Tetsuo Handa
2011-07-05 12:21 ` Richard Weinberger
2011-07-06 11:28 ` Tetsuo Handa
2011-07-06 11:36 ` Richard Weinberger
2011-07-06 20:21 ` Andrew Morton
2011-07-07 4:04 ` Tetsuo Handa
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