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: <c5632908-1b0f-af1f-4754-bf1d0027a6dc@kernel.dk>
Date:   Mon, 16 Jan 2023 06:42:28 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     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 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 Axboe