Messages in this thread | | | Date | Tue, 30 Apr 2019 16:15:01 +0200 | From | Oleg Nesterov <> | Subject | Re: [RT WARNING] DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current) with fsfreeze (4.19.25-rt16) |
| |
Sorry, I don't understand...
On 04/30, Peter Zijlstra wrote: > > Thaw then does the reverse, frobs lockdep
Yes, in particular it does
lockdep_sb_freeze_acquire() percpu_rwsem_acquire() sem->rw_sem.owner = current;
> and then does: percpu_up_write(). > > percpu_up_write() on up_write(). And note how __up_write() has: > > DEBUG_RWSEMS_WARN_ON(sem->owner != current, sem);
and everything looks correct, sem->owner == current by the time thaw_super_locked() does percpu_up_write/up_write.
Oleg.
| |