From: Haakon Bugge <haakon.bugge@oracle.com>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Will Deacon <will@kernel.org>,
Boqun Feng <boqun@kernel.org>, Waiman Long <longman@redhat.com>,
Chris Wilson <chris@chris-wilson.co.uk>,
Guenter Roeck <linux@roeck-us.net>
Cc: John Stultz <jstultz@google.com>, Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH v3 3/3] test-ww_mutex: Handle transient -EDEADLK in test_cycle_work
Date: Tue, 18 Aug 2026 08:35:27 +0000 [thread overview]
Message-ID: <8531DF64-A324-45DA-BEAC-1A0CCB6CBBAE@oracle.com> (raw)
In-Reply-To: <20260804163139.3121781-4-haakon.bugge@oracle.com>
> On 4 Aug 2026, at 18:31, Håkon Bugge <Haakon.Bugge@oracle.com> wrote:
>
> There is a timing issue in test_cycle_work(), in the sense that
> acquiring *a_mutex* after deadlock has been detected on the *b_mutex*,
> may not succeed immediately. This may lead to false negatives, which
> shows up in the log as:
>
> cyclic deadlock not resolved, ret[77/93] = -35
>
> We re-factor the inner part test_cycle_work(), where we loop a few
> times attempting to acquire the mutexes in BAAB order. If the first A
> succeeds or the last B succeeds, we break out of the loop.
>
> Fixes: d1b42b800e5d ("locking/ww_mutex: Add kselftests for resolving ww_mutex cyclic deadlocks")
> Fixes: e4a02ed2aaf4 ("locking/ww_mutex: Fix runtime warning in the WW mutex selftest")
> Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>
> Acked-by: John Stultz <jstultz@google.com>
A gentle ping on the v3 of this series.
Thxs, Håkon
prev parent reply other threads:[~2026-08-18 8:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-04 16:31 [PATCH v3 0/3] test-ww_mutex: Miscellaneous fixes Håkon Bugge
2026-08-04 16:31 ` [PATCH v3 1/3] test-ww_mutex: Fix module cleanup Håkon Bugge
2026-08-04 16:31 ` [PATCH v3 2/3] test-ww_mutex: Report errors from stress workers Håkon Bugge
2026-08-04 16:31 ` [PATCH v3 3/3] test-ww_mutex: Handle transient -EDEADLK in test_cycle_work Håkon Bugge
2026-08-18 8:35 ` Haakon Bugge [this message]
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