lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Fri, 26 Nov 2021 11:10:09 -0700
From:   Jens Axboe <>
To:     "Kenneth R. Crudup" <>
        Shinichiro Kawasaki <>
Subject: Re: Write I/O queue hangup at random on recent Linus' kernels

On 11/26/21 10:58 AM, Kenneth R. Crudup wrote:
> On Fri, 26 Nov 2021, Jens Axboe wrote:
>> Can you apply this on top of 5.16-rc2 or current -git and see if it fixes
>> it for you?
> Since it's related to writeback throttling, is there anything I can try to
> taunt it? I was thinking "iozone" or "bonnie++", but if there's something
> better, let me know.

I'd just do what you usually do, that's usually the best way to gain
confidence in the fix. But it's related to writeback throttling _and_
racing with eg iostats grabbing a reference to the request, so it would
be more likely to trigger with a heavier combination of those two.

That said, I'm pretty confident in the fix, so if you'd just use it for
a day or two, then with the previous amount of hangs you saw on -rc2 it
should provide a good level of confidence in it.

Jens Axboe

Powered by blists - more mailing lists