diff options
| author | Pavel Begunkov <[email protected]> | 2021-01-26 23:35:10 +0000 |
|---|---|---|
| committer | Jens Axboe <[email protected]> | 2021-01-26 19:36:55 -0700 |
| commit | 907d1df30a51cc1a1d25414a00cde0494b83df7b (patch) | |
| tree | 4f4c77ff3eab78ccc44536dc01c21b6b8000127c /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | ca70f00bed6cb255b7a9b91aa18a2717c9217f70 (diff) | |
io_uring: fix wqe->lock/completion_lock deadlock
Joseph reports following deadlock:
CPU0:
...
io_kill_linked_timeout // &ctx->completion_lock
io_commit_cqring
__io_queue_deferred
__io_queue_async_work
io_wq_enqueue
io_wqe_enqueue // &wqe->lock
CPU1:
...
__io_uring_files_cancel
io_wq_cancel_cb
io_wqe_cancel_pending_work // &wqe->lock
io_cancel_task_cb // &ctx->completion_lock
Only __io_queue_deferred() calls queue_async_work() while holding
ctx->completion_lock, enqueue drained requests via io_req_task_queue()
instead.
Cc: [email protected] # 5.9+
Reported-by: Joseph Qi <[email protected]>
Tested-by: Joseph Qi <[email protected]>
Signed-off-by: Pavel Begunkov <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions