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| author | Pavel Begunkov <[email protected]> | 2021-01-26 23:35:10 +0000 |
|---|---|---|
| committer | Jens Axboe <[email protected]> | 2021-01-27 02:36:55 +0000 |
| commit | 907d1df30a51cc1a1d25414a00cde0494b83df7b (patch) | |
| tree | 4f4c77ff3eab78ccc44536dc01c21b6b8000127c /scripts/gcc-plugins/cyc_complexity_plugin.c | |
| parent | io_uring: fix cancellation taking mutex while TASK_UNINTERRUPTIBLE (diff) | |
| download | kernel-907d1df30a51cc1a1d25414a00cde0494b83df7b.tar.gz kernel-907d1df30a51cc1a1d25414a00cde0494b83df7b.zip | |
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 'scripts/gcc-plugins/cyc_complexity_plugin.c')
0 files changed, 0 insertions, 0 deletions