diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2021-02-01 11:55:38 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-02-05 17:20:15 +0100 |
| commit | 7f82e631d236cafd28518b998c6d4d8dc2ef68f6 (patch) | |
| tree | 4ea7c080dd68f093e113c0b526d9e96b613cbf86 /kernel | |
| parent | 442187f3c2de40bab13b8f9751b37925bede73b0 (diff) | |
locking/lockdep: Avoid unmatched unlock
Commit f6f48e180404 ("lockdep: Teach lockdep about "USED" <- "IN-NMI"
inversions") overlooked that print_usage_bug() releases the graph_lock
and called it without the graph lock held.
Fixes: f6f48e180404 ("lockdep: Teach lockdep about "USED" <- "IN-NMI" inversions")
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Waiman Long <longman@redhat.com>
Link: https://lkml.kernel.org/r/YBfkuyIfB1+VRxXP@hirez.programming.kicks-ass.net
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/locking/lockdep.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index ad9afd8c7eb9..5104db0e23e4 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -3773,7 +3773,7 @@ static void print_usage_bug(struct task_struct *curr, struct held_lock *this, enum lock_usage_bit prev_bit, enum lock_usage_bit new_bit) { - if (!debug_locks_off_graph_unlock() || debug_locks_silent) + if (!debug_locks_off() || debug_locks_silent) return; pr_warn("\n"); @@ -3814,6 +3814,7 @@ valid_state(struct task_struct *curr, struct held_lock *this, enum lock_usage_bit new_bit, enum lock_usage_bit bad_bit) { if (unlikely(hlock_class(this)->usage_mask & (1 << bad_bit))) { + graph_unlock(); print_usage_bug(curr, this, bad_bit, new_bit); return 0; } |