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Message-ID: <20171221031606.GA4636@codemonkey.org.uk> Date: Wed, 20 Dec 2017 22:16:06 -0500 From: Dave Jones <davej@...emonkey.org.uk> To: "Eric W. Biederman" <ebiederm@...ssion.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Al Viro <viro@...iv.linux.org.uk>, Linux Kernel <linux-kernel@...r.kernel.org>, syzkaller-bugs@...glegroups.com, Gargi Sharma <gs051095@...il.com>, Alexey Dobriyan <adobriyan@...il.com> Subject: Re: proc_flush_task oops On Wed, Dec 20, 2017 at 12:25:52PM -0600, Eric W. Biederman wrote: > > > > > > If the warning triggers it means the bug is in alloc_pid and somehow > > > something has gotten past the is_child_reaper check. > > > > You're onto something. > > > I am not seeing where things go wrong, but that puts the recent pid bitmap, bit > hash to idr change in the suspect zone. > > Can you try reverting that change: > > e8cfbc245e24 ("pid: remove pidhash") > 95846ecf9dac ("pid: replace pid bitmap implementation with IDR API") > > While keeping the warning in place so we can see if this fixes the > allocation problem? So I can't trigger this any more with those reverted. I seem to hit a bunch of other long-standing bugs first. I'll keep running it overnight, but it looks like this is where the problem lies. Dave
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