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Date: Wed, 20 Feb 2019 19:41:53 -0500
From: Rich Felker <dalias@...c.org>
To: Alexey Izbyshev <izbyshev@...ras.ru>
Cc: musl@...ts.openwall.com
Subject: Re: __synccall: deadlock and reliance on racy /proc/self/task
On Tue, Feb 12, 2019 at 01:48:49PM -0500, Rich Felker wrote:
> On Sun, Feb 03, 2019 at 12:40:39AM +0300, Alexey Izbyshev wrote:
> > Hello!
> >
> > I've discovered that setuid() deadlocks on a simple stress test
> > (attached: test-setuid.c) that creates threads concurrently with
> > setuid(). (Tested on 1.1.21 on x86_64, kernel 4.15.x and 4.4.x). The
> > gdb output:
>
> FYI I just posted the start of a new thread describing the possible
> thread list design:
>
> https://www.openwall.com/lists/musl/2019/02/12/14
>
> If you want to reply into it the message-id for replies is,
>
> Message-ID: <20190212182625.GA24199@...ghtrain.aerifal.cx>
>
> (still wish the openwall archive showed those...)
I believe this issue should be entirely fixed now in git master.
When you have time to test, the relevant commits are
e4235d70672d9751d7718ddc2b52d0b426430768 and the few leading up to it.
Rich
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