From: Jens Axboe <[email protected]>
To: Drew DeVault <[email protected]>, [email protected]
Subject: Re: Consistently reproducible deadlock with simple io_uring program
Date: Sat, 15 Aug 2020 19:40:35 -0700 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <C4Y2LXWFIUZX.47V7HCX3WU5D@homura>
On 8/15/20 7:38 PM, Drew DeVault wrote:
> On Sat Aug 15, 2020 at 10:37 PM EDT, Jens Axboe wrote:
>> This should be fixed by this one:
>>
>> https://git.kernel.dk/cgit/linux-block/commit/?h=io_uring-5.9&id=d4e7cd36a90e38e0276d6ce0c20f5ccef17ec38c
>>
>> which will go into 5.7/5.8 stable shortly. Affected files are the ones
>> that use double waitqueues at the same time for polling, which are
>> mostly just tty...
>
> Thanks, I'll give this patch a try. I can trivially verify that it works
> correctly if stdin is not a TTY, I should have tried that myself. Do you
> know of any userspace workarounds for the problem that I could try on
> older kernels?
Not really any work-arounds, and on earlier 5.7 (and 5.6 and older) the
poll operation would have just failed with -EINVAL.
--
Jens Axboe
next prev parent reply other threads:[~2020-08-16 2:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-16 2:12 Consistently reproducible deadlock with simple io_uring program Drew DeVault
2020-08-16 2:37 ` Jens Axboe
2020-08-16 2:38 ` Drew DeVault
2020-08-16 2:40 ` Jens Axboe [this message]
2020-08-16 2:41 ` Drew DeVault
2020-08-16 15:17 ` Drew DeVault
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