linux-kernel - Re: Several tst-robust* tests time out with recent Linux kernel

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Date:   Wed, 15 Nov 2023 01:11:20 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "peterz@...radead.org" <peterz@...radead.org>,
        "fweimer@...hat.com" <fweimer@...hat.com>
CC:     "xry111@...111.site" <xry111@...111.site>,
        "andrealmeid@...lia.com" <andrealmeid@...lia.com>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "libc-alpha@...rceware.org" <libc-alpha@...rceware.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: Re: Several tst-robust* tests time out with recent Linux kernel

On Tue, 2023-11-14 at 21:14 +0100, Peter Zijlstra wrote:
> Urgh, thanks!
> 
> Confirmed, the below cures things. Although I should probably make
> that
> FLAGS_SIZE_32 | FLAGS_SHARED against Linus' tree.
> 
> Let me go do a proper patch.

I saw these fail on the glibc shadow stack branch today, and I also saw
this one failing:
FAIL: nptl/tst-robustpi8

It spit out:
mutex_timedlock of 41 in thread 1 failed with 22
child did not die of a signal in round 1

After the fix here I saw the others pass, but still not tst-robustpi8.
Not sure if it is some shadow stack complication. I can try to dig in
tomorrow if the problem doesn't jump out.