From: Andrew Morton <akpm@linux-foundation.org>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Qian Cai <cai@lca.pw>,
axboe@kernel.dk, hch@lst.de, peterz@infradead.org,
gkohli@codeaurora.org, mingo@redhat.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, Hugh Dickins <hughd@google.com>
Subject: Re: [PATCH] swap_readpage: avoid blk_wake_io_task() if !synchronous
Date: Thu, 4 Jul 2019 12:32:18 -0700 [thread overview]
Message-ID: <20190704123218.87a763f771efad158e1b0a89@linux-foundation.org> (raw)
In-Reply-To: <20190704160301.GA5956@redhat.com>
On Thu, 4 Jul 2019 18:03:01 +0200 Oleg Nesterov <oleg@redhat.com> wrote:
> swap_readpage() sets waiter = bio->bi_private even if synchronous = F,
> this means that the caller can get the spurious wakeup after return. This
> can be fatal if blk_wake_io_task() does set_current_state(TASK_RUNNING)
> after the caller does set_special_state(), in the worst case the kernel
> can crash in do_task_dead().
I think we need a Fixes: and a cc:stable here?
IIRC, we're fixing 0619317ff8baa2 ("block: add polled wakeup task helper").
next prev parent reply other threads:[~2019-07-04 19:32 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-29 20:25 [PATCH] block: fix a crash in do_task_dead() Qian Cai
2019-05-29 20:31 ` Jens Axboe
2019-05-30 8:03 ` Peter Zijlstra
2019-05-31 21:12 ` Jens Axboe
2019-06-03 12:37 ` Peter Zijlstra
2019-06-03 12:44 ` Peter Zijlstra
2019-06-03 16:09 ` Oleg Nesterov
2019-06-03 16:19 ` Peter Zijlstra
2019-06-03 16:23 ` Jens Axboe
2019-06-05 15:04 ` Jens Axboe
2019-06-07 13:35 ` Peter Zijlstra
2019-06-07 14:23 ` Peter Zijlstra
2019-06-08 8:39 ` Jens Axboe
2019-06-10 13:13 ` Gaurav Kohli
2019-06-10 14:46 ` Oleg Nesterov
2019-06-11 4:39 ` Gaurav Kohli
2019-06-30 23:06 ` Hugh Dickins
2019-07-01 14:22 ` Jens Axboe
2019-07-02 22:06 ` Andrew Morton
2019-07-03 17:35 ` Oleg Nesterov
2019-07-03 17:44 ` Hugh Dickins
2019-07-04 16:00 ` Oleg Nesterov
2019-07-03 17:52 ` Jens Axboe
2019-05-30 11:15 ` Oleg Nesterov
2019-05-31 21:10 ` Jens Axboe
2019-07-04 16:03 ` [PATCH] swap_readpage: avoid blk_wake_io_task() if !synchronous Oleg Nesterov
2019-07-04 19:32 ` Andrew Morton [this message]
2019-07-04 21:15 ` Hugh Dickins
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