linux-kernel - Re: UBSAN: Undefined behaviour in kernel/time/posix-timers.c:705

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Message-ID: <alpine.DEB.2.21.1806241507590.8650@nanos.tec.linutronix.de>
Date:   Sun, 24 Jun 2018 15:10:23 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     air icy <icytxw@...il.com>
cc:     linux-kernel@...r.kernel.org
Subject: Re: UBSAN: Undefined behaviour in kernel/time/posix-timers.c:705

On Fri, 22 Jun 2018, air icy wrote:
> ================================================================================
> UBSAN: Undefined behaviour in kernel/time/posix-timers.c:705:20
> signed integer overflow:
> -1863446814 + -1863446813 cannot be represented in type 'int'

Yuck. Both numbers are bogus if I looked at the correct place.

> bugzilla url:https://bugzilla.kernel.org/show_bug.cgi?id=200189
> 
> This bug can be repro, if you need this, please me.

Reproducer please.

Thanks,

	tglx