linux-kernel - Unexpected lockdep selftest failures

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Message-ID: <9025e912-7151-4a1e-b1ba-91eafde12179@acm.org>
Date: Fri, 22 Nov 2024 12:18:40 -0800
From: Bart Van Assche <bvanassche@....org>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>
Cc: linux-kernel@...r.kernel.org
Subject: Unexpected lockdep selftest failures

Hi,

With the for-next branch of this tree: git://git.kernel.dk/linux-block
(commit 12ab2c13ca77 ("Merge branch 'for-6.13/block' into for-next")) I
see the following:


[    0.887603][    T0] 
--------------------------------------------------------------------------
[    0.888763][    T0]   | Wound/wait tests |
[    0.889310][    T0]   ---------------------
[    0.889867][    T0]                   ww api failures:  ok  |FAILED| 
ok  |
[    0.892597][    T0]                ww contexts mixing:  ok  |  ok  |
[    0.894638][    T0]              finishing ww context:  ok  |  ok  | 
ok  |  ok  |
[    0.898020][    T0]                locking mismatches:  ok  |  ok  | 
ok  |
[    0.900689][    T0]                  EDEADLK handling:  ok  |  ok  | 
ok  |  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
[    0.908172][    T0]            spinlock nest unlocked:  ok  |
[    0.909484][    T0]                spinlock nest test:  ok  |
[    0.910902][    T0] 
-----------------------------------------------------
[    0.911824][    T0]                                  |block | try 
|context|
[    0.912970][    T0] 
-----------------------------------------------------
[    0.913890][    T0]                           context:  ok  |  ok  | 
ok  |
[    0.916613][    T0]                               try:  ok  |  ok  | 
ok  |
[    0.919235][    T0]                             block:  ok  |  ok  | 
ok  |
[    0.921852][    T0]                          spinlock:  ok  |  ok 
|FAILED|
[    0.924666][    T0] 
--------------------------------------------------------------------------
[    0.925852][    T0]   | queued read lock tests |
[    0.926506][    T0]   ---------------------------
[    0.927132][    T0]       hardirq read-lock/lock-read:  ok  |
[    0.928496][    T0]       hardirq lock-read/read-lock:  ok  |
[    0.929860][    T0]                 hardirq inversion:  ok  |
[    0.931269][    T0]   --------------------
[    0.931827][    T0]   | fs_reclaim tests |
[    0.932383][    T0]   --------------------
[    0.932932][    T0]                   correct nesting:  ok  |
[    0.934252][    T0]                     wrong nesting:  ok  |
[    0.935518][    T0]                 protected nesting:  ok  |
[    0.936784][    T0] 
--------------------------------------------------------------------------
[    0.937936][    T0]   | wait context tests |
[    0.938516][    T0] 
--------------------------------------------------------------------------
[    0.939661][    T0]                                  | rcu  | raw  | 
spin |mutex |
[    0.940646][    T0] 
--------------------------------------------------------------------------
[    0.941798][    T0]                in hardirq context:  ok  |  ok  | 
ok  |  ok  |
[    0.944946][    T0] in hardirq context (not threaded):  ok  |  ok  | 
ok  |  ok  |
[    0.948072][    T0]                in softirq context:  ok  |  ok  | 
ok  |  ok  |
[    0.951206][    T0]                    in RCU context:  ok  |  ok  | 
ok  |  ok  |
[    0.954345][    T0]                 in RCU-bh context:  ok  |  ok  | 
ok  |  ok  |
[    0.957477][    T0]              in RCU-sched context:  ok  |  ok  | 
ok  |  ok  |
[    0.960612][    T0]           in RAW_SPINLOCK context:  ok  |  ok  | 
ok  |  ok  |
[    0.963927][    T0]               in SPINLOCK context:  ok  |  ok  | 
ok  |  ok  |
[    0.967252][    T0]                  in MUTEX context:  ok  |  ok  | 
ok  |  ok  |
[    0.970571][    T0] 
--------------------------------------------------------------------------
[    0.971702][    T0]   | local_lock tests |
[    0.972422][    T0]   ---------------------
[    0.972965][    T0]           local_lock inversion  2:  ok  |
[    0.974319][    T0]           local_lock inversion 3A:  ok  |
[    0.975708][    T0]           local_lock inversion 3B:  ok  |
[    0.977106][    T0]       hardirq_unsafe_softirq_safe:  ok  |
[    0.978595][    T0] 
--------------------------------------------------------------------------
[    0.979723][    T0]   | lockdep_set_subclass() name test|
[    0.980424][    T0]   -----------------------------------
[    0.981123][    T0]     compare name before and after:  ok  |
[    0.982423][    T0] 
-----------------------------------------------------------------
[    0.983434][    T0] BUG:   2 unexpected failures (out of 395) - 
debugging disabled! |
[    0.984441][    T0] 
-----------------------------------------------------------------


Is this a known issue?

Thanks,

Bart.