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| author | Luis Claudio R. Goncalves <lgoncalv@redhat.com> | 2024-07-30 19:45:47 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2024-08-05 16:54:41 +0200 |
| commit | 7886a61ebc1f3998df5950299cbe17272bf32c59 (patch) | |
| tree | 519c896924ea3f6d1f90e326c057f1e1fdf65ec3 /kernel | |
| parent | locking/atomic/x86: Redeclare x86_32 arch_atomic64_{add,sub}() as void (diff) | |
| download | linux-7886a61ebc1f3998df5950299cbe17272bf32c59.tar.xz linux-7886a61ebc1f3998df5950299cbe17272bf32c59.zip | |
lockdep: suggest the fix for "lockdep bfs error:-1" on print_bfs_bug
When lockdep fails while performing the Breadth-first-search operation
due to lack of memory, hint that increasing the value of the config
switch LOCKDEP_CIRCULAR_QUEUE_BITS should fix the warning.
Preface the scary backtrace with the suggestion:
[ 163.849242] Increase LOCKDEP_CIRCULAR_QUEUE_BITS to avoid this warning:
[ 163.849248] ------------[ cut here ]------------
[ 163.849250] lockdep bfs error:-1
[ 163.849263] WARNING: CPU: 24 PID: 2454 at kernel/locking/lockdep.c:2091 print_bfs_bug+0x27/0x40
...
Signed-off-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Reviewed-by: Waiman Long <longman@redhat.com>
Link: https://lkml.kernel.org/r/Zqkmy0lS-9Sw0M9j@uudg.org
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/locking/lockdep.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 726b22ce7d0b..fee21f3c3b99 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -2067,6 +2067,9 @@ static noinline void print_bfs_bug(int ret) /* * Breadth-first-search failed, graph got corrupted? */ + if (ret == BFS_EQUEUEFULL) + pr_warn("Increase LOCKDEP_CIRCULAR_QUEUE_BITS to avoid this warning:\n"); + WARN(1, "lockdep bfs error:%d\n", ret); } |