io_uring: fix unprotected iopoll overflow
[ 71.490669] WARNING: CPU: 3 PID: 17070 at io_uring/io_uring.c:769
io_cqring_event_overflow+0x47b/0x6b0
[ 71.498381] Call Trace:
[ 71.498590] <TASK>
[ 71.501858] io_req_cqe_overflow+0x105/0x1e0
[ 71.502194] __io_submit_flush_completions+0x9f9/0x1090
[ 71.503537] io_submit_sqes+0xebd/0x1f00
[ 71.503879] __do_sys_io_uring_enter+0x8c5/0x2380
[ 71.507360] do_syscall_64+0x39/0x80
We decoupled CQ locking from ->task_complete but haven't fixed up places
forcing locking for CQ overflows.
Fixes: ec26c225f06f5 ("io_uring: merge iopoll and normal completion paths")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 file changed
