linux-kernel - Re: [regression] Bug 216932 - io_uring with libvirt cause kernel NULL pointer dereference since 6.1.5

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Message-ID: <6d075006-7f32-7d39-6d96-4a94d4dbdf40@leemhuis.info>
Date:   Mon, 16 Jan 2023 14:54:16 +0100
From:   "Linux kernel regression tracking (#update)" 
        <regressions@...mhuis.info>
To:     Jens Axboe <axboe@...nel.dk>,
        Linux regressions mailing list <regressions@...ts.linux.dev>
Cc:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        io-uring@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        "Sergey V." <truesmb@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [regression] Bug 216932 - io_uring with libvirt cause kernel NULL pointer dereference since 6.1.5

On 16.01.23 14:42, Jens Axboe wrote:
> On 1/16/23 6:17?AM, Linux kernel regression tracking (Thorsten Leemhuis) wrote:
>> Hi, this is your Linux kernel regression tracker.
>>
>> I noticed a regression report in bugzilla.kernel.org. As many (most?)
>> kernel developer don't keep an eye on it, I decided to forward it by
>> mail. Quoting from https://bugzilla.kernel.org/show_bug.cgi?id=216932 :
> 
> Looks like:
> 
> commit 6d47e0f6a535701134d950db65eb8fe1edf0b575
> Author: Jens Axboe <axboe@...nel.dk>
> Date:   Wed Jan 4 08:52:06 2023 -0700
> 
>     block: don't allow splitting of a REQ_NOWAIT bio
> 
> got picked up by stable, but not the required prep patch:
> 
> 
> commit 613b14884b8595e20b9fac4126bf627313827fbe
> Author: Jens Axboe <axboe@...nel.dk>
> Date:   Wed Jan 4 08:51:19 2023 -0700
> 
>     block: handle bio_split_to_limits() NULL return
> 
> Greg/team, can you pick the latter too? It'll pick cleanly for
> 6.1-stable, not sure how far back the other patch has gone yet.

Jens, many thx for looking so quickly into this!

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
That page also explains what to do if mails like this annoy you.

#regzbot fix: block: handle bio_split_to_limits() NULL return
#regzbot ignore-activity