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Message-ID: <aYyHV-wPS0UrL59y@li-dc0c254c-257c-11b2-a85c-98b6c1322444.ibm.com>
Date: Wed, 11 Feb 2026 19:12:47 +0530
From: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To: syzbot <syzbot+ccf1421545dbe5caa20c@...kaller.appspotmail.com>
Cc: linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ext4?] kernel BUG in ext4_es_cache_extent (4)

On Wed, Feb 11, 2026 at 02:03:02AM -0800, syzbot wrote:
> Hello,
> 
> syzbot has tested the proposed patch and the reproducer did not trigger any issue:
> 
> Reported-by: syzbot+ccf1421545dbe5caa20c@...kaller.appspotmail.com
> Tested-by: syzbot+ccf1421545dbe5caa20c@...kaller.appspotmail.com
> 
> Tested on:
> 
> commit:         4f5e8e6f et4: allow zeroout when doing written to unwr..
> git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
> console output: https://syzkaller.appspot.com/x/log.txt?x=17815b22580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a535ad5429f72a2
> dashboard link: https://syzkaller.appspot.com/bug?extid=ccf1421545dbe5caa20c
> compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
> patch:          https://syzkaller.appspot.com/x/patch.diff?x=120cccaa580000
> 
> Note: testing is done by a robot and is best-effort only.

Okay I think adding dump_stack() in the patches is leading to weird
invalid opcodes in syzbot which is hiding the actual issue. 

Lets try again (sorry for the spam, somehow im unable to replicate in my
vm):

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev



View attachment "0001-ext4-add-logging-to-debug-issue.patch" of type "text/plain" (6596 bytes)

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