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Date: Tue, 12 Feb 2019 13:48:49 -0500
From: Rich Felker <>
To: Alexey Izbyshev <>
Subject: Re: __synccall: deadlock and reliance on racy /proc/self/task

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:

If you want to reply into it the message-id for replies is,

Message-ID: <>

(still wish the openwall archive showed those...)


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