linux-kernel - [bisected] system hang after boot

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Date:   Wed, 22 Nov 2017 18:46:01 +0100 (CET)
From:   Sebastian Ott <sebott@...ux.vnet.ibm.com>
To:     Will Deacon <will.deacon@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>
cc:     Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        linux-kernel@...r.kernel.org
Subject: [bisected] system hang after boot

Hi,

One of my test systems (s390) hangs after boot. One of the cpus is idle
the other is in arch_spin_relax. Bisect pointed to this one:

a8a217c22116eff6c120d753c9934089fb229af0 is the first bad commit
commit a8a217c22116eff6c120d753c9934089fb229af0
Author: Will Deacon <will.deacon@....com>
Date:   Tue Oct 3 19:25:27 2017 +0100

    locking/core: Remove {read,spin,write}_can_lock()

    Outside of the locking code itself, {read,spin,write}_can_lock() have no
    users in tree. Apparmor (the last remaining user of write_can_lock()) got
    moved over to lockdep by the previous patch.

    This patch removes the use of {read,spin,write}_can_lock() from the
    BUILD_LOCK_OPS macro, deferring to the trylock operation for testing the
    lock status, and subsequently removes the unused macros altogether. They
    aren't guaranteed to work in a concurrent environment and can give
    incorrect results in the case of qrwlock.

    Signed-off-by: Will Deacon <will.deacon@....com>
    Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
    Cc: Linus Torvalds <torvalds@...ux-foundation.org>
    Cc: Peter Zijlstra <peterz@...radead.org>
    Cc: Thomas Gleixner <tglx@...utronix.de>
    Cc: paulmck@...ux.vnet.ibm.com
    Link: http://lkml.kernel.org/r/1507055129-12300-2-git-send-email-will.deacon@arm.com
    Signed-off-by: Ingo Molnar <mingo@...nel.org>


Bisect log and config attached. The same config but with lockdep enabled
works ok.

Sebastian
View attachment "bisect.log" of type "text/plain" (2849 bytes)

View attachment "config" of type "text/plain" (57564 bytes)