linux-kernel - Re: [PATCH 1/1] io_uring: fix lazy work init

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Message-ID: <eaeab71d-6a53-95e8-03d3-5e22d7e6de49@kernel.dk>
Date:   Mon, 15 Jun 2020 08:38:57 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Pavel Begunkov <asml.silence@...il.com>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     jiufei.xue@...ux.alibaba.com
Subject: Re: [PATCH 1/1] io_uring: fix lazy work init

On 6/15/20 7:36 AM, Pavel Begunkov wrote:
> 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

Applied, thanks.

-- 
Jens Axboe