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io_uring: fix lazy work init

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Don't leave garbage in req.work before punting async on -EAGAIN
in io_iopoll_queue().

[  140.922099] general protection fault, probably for non-canonical
     address 0xdead000000000100: 0000 [#1] PREEMPT SMP PTI
...
[  140.922105] RIP: 0010:io_worker_handle_work+0x1db/0x480
...
[  140.922114] Call Trace:
[  140.922118]  ? __next_timer_interrupt+0xe0/0xe0
[  140.922119]  io_wqe_worker+0x2a9/0x360
[  140.922121]  ? _raw_spin_unlock_irqrestore+0x24/0x40
[  140.922124]  kthread+0x12c/0x170
[  140.922125]  ? io_worker_handle_work+0x480/0x480
[  140.922126]  ? kthread_park+0x90/0x90
[  140.922127]  ret_from_fork+0x22/0x30

Fixes: 7cdaf587de ("io_uring: avoid whole io_wq_work copy for requests completed inline")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-06-15 16:36:30 +03:00 committed by Jens Axboe
parent b3a9e3b962
commit 59960b9deb
1 changed files with 1 additions and 0 deletions
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1
fs/io_uring.c
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@ -1087,6 +1087,7 @@ static inline void io_prep_async_work(struct io_kiocb *req,
req->work.flags |= IO_WQ_WORK_UNBOUND;
}
io_req_init_async(req);
io_req_work_grab_env(req, def);
*link = io_prep_linked_timeout(req);