fscache: check consistency does not decrement refcount
__fscache_check_consistency() does not decrement the count of operations
active after it finishes in the success case. This leads to a hung tasks on
cookie de-registration (commonly in inode eviction).
INFO: task kworker/1:2:4214 blocked for more than 120 seconds.
kworker/1:2 D ffff880443513fc0 0 4214 2 0x00000000
Workqueue: ceph-msgr con_work [libceph]
...
Call Trace:
[<ffffffff81569fc6>] ? _raw_spin_unlock_irqrestore+0x16/0x20
[<ffffffffa0016570>] ? fscache_wait_bit_interruptible+0x30/0x30 [fscache]
[<ffffffff81568d09>] schedule+0x29/0x70
[<ffffffffa001657e>] fscache_wait_atomic_t+0xe/0x20 [fscache]
[<ffffffff815665cf>] out_of_line_wait_on_atomic_t+0x9f/0xe0
[<ffffffff81083560>] ? autoremove_wake_function+0x40/0x40
[<ffffffffa0015a9c>] __fscache_relinquish_cookie+0x15c/0x310 [fscache]
[<ffffffffa00a4fae>] ceph_fscache_unregister_inode_cookie+0x3e/0x50 [ceph]
[<ffffffffa007e373>] ceph_destroy_inode+0x33/0x200 [ceph]
[<ffffffff811c13ae>] ? __fsnotify_inode_delete+0xe/0x10
[<ffffffff8119ba1c>] destroy_inode+0x3c/0x70
[<ffffffff8119bb69>] evict+0x119/0x1b0
Signed-off-by: Milosz Tanski <milosz@adfin.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Sage Weil <sage@inktank.com>
1 file changed