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Date: Mon, 1 Dec 2014 09:53:16 -0800 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Will Deacon <will.deacon@....com>, Tejun Heo <tj@...nel.org> Cc: Dave Jones <davej@...hat.com>, Andy Lutomirski <luto@...capital.net>, Don Zickus <dzickus@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Linux Kernel <linux-kernel@...r.kernel.org>, "the arch/x86 maintainers" <x86@...nel.org>, Peter Zijlstra <peterz@...radead.org> Subject: Re: frequent lockups in 3.18rc4 On Mon, Dec 1, 2014 at 9:10 AM, Will Deacon <will.deacon@....com> wrote: > > So I don't even have binfmt-misc compiled in. The two handlers I have are > BINFMT_ELF and BINFMT_SCRIPT, but they both check for headers that we won't > get back from oom_score afaict. Hmm. So I can't even get that "oom_score" file to be executable in the first place, which should mean that execve() should terminate very quickly with an EACCES error. The fact that you have a "flush_work()" that is waiting for completion is interesting. Maybe the odd new thread is a worker thread for some modprobe or similar, and we . There's that whole request_module("binfmt-%04x", *(ushort *)(bprm->buf + 2)) which ends up creating a new work. Maybe the flush_work() is waiting for that whole mess. Adding Tejun to the cc, since there *were* changes to workqueues etc since 3.16.. Tejun, full thread on lkml, I'm assuming you can find it in your mail archives.. Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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