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authorTejun Heo <tj@kernel.org>2011-12-27 18:52:16 +0100
committerJens Axboe <axboe@kernel.dk>2011-12-27 18:52:16 +0100
commitc98b2cc29af8e84e7364b53e9bb4cc7cfaf62555 (patch)
treeed6e9642bb32fe53f5c036c66df4b6692228d0a9 /block
parentfd63836811d6e5b5f5f608abf865bc9e91762c8c (diff)
downloadlinux-linaro-stable-c98b2cc29af8e84e7364b53e9bb4cc7cfaf62555.tar.gz
block: remove WARN_ON_ONCE() in exit_io_context()
6e736be7 "block: make ioc get/put interface more conventional and fix race on alloction" added WARN_ON_ONCE() in exit_io_context() which triggers if !PF_EXITING. All tasks hitting exit_io_context() from task exit should have PF_EXITING set but task struct tearing down after fork failure calls into the function without PF_EXITING, triggering the condition. WARNING: at block/blk-ioc.c:234 exit_io_context+0x40/0x92() Pid: 17090, comm: trinity Not tainted 3.2.0-rc6-next-20111222-sasha-dirty #77 Call Trace: [<ffffffff810b69a3>] warn_slowpath_common+0x8f/0xb2 [<ffffffff810b6a77>] warn_slowpath_null+0x18/0x1a [<ffffffff8181a7a2>] exit_io_context+0x40/0x92 [<ffffffff810b58c9>] copy_process+0x126f/0x1453 [<ffffffff810b5c1b>] do_fork+0x120/0x3e9 [<ffffffff8106242f>] sys_clone+0x26/0x28 [<ffffffff82425803>] stub_clone+0x13/0x20 ---[ end trace a2e4eb670b375238 ]--- Reported-by: Sasha Levin <levinsasha928@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-ioc.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/block/blk-ioc.c b/block/blk-ioc.c
index 33fae7df16a0..27a06e00eaec 100644
--- a/block/blk-ioc.c
+++ b/block/blk-ioc.c
@@ -230,9 +230,6 @@ void exit_io_context(struct task_struct *task)
{
struct io_context *ioc;
- /* PF_EXITING prevents new io_context from being attached to @task */
- WARN_ON_ONCE(!(current->flags & PF_EXITING));
-
task_lock(task);
ioc = task->io_context;
task->io_context = NULL;