linux-kernel - [Linux Kernel Bug] WARNING: locking bug in ext4_mb_use

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Message-ID: <CANypQFZ=0P1yPDXe0Gdubqj=SZXav_Zd7Ow=WWKu5YX4V6LFXQ@mail.gmail.com>
Date: Fri, 12 Sep 2025 00:40:23 +0800
From: Jiaming Zhang <r772577952@...il.com>
To: adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org, tytso@....edu
Cc: linux-kernel@...r.kernel.org, syzkaller@...glegroups.com
Subject: [Linux Kernel Bug] WARNING: locking bug in ext4_mb_use_preallocated

Dear Linux kernel developers and maintainers:

We are writing to report a kernel WARNING in ext4_mb_use_preallocated,
discovered with our modified version of syzkaller.

This issue was initially found in kernel v6.17-rc5 (commit
76eeb9b8de9880ca38696b2fb56ac45ac0a25c6c). Unfortunately, we do not
have a stable C or Syz program to reproduce this warning. We are
actively analyzing the root cause and working to create a reliable
reproducer, which we will share as soon as it is available.

Attached are the kernel console output, .config file, and formatted
bug reports (formatted by syz-symbolize) for your analysis. Please let
us know if any further information would be helpful.

Best regards,
Jiaming Zhang

Download attachment "kernel2.log" of type "application/octet-stream" (150078 bytes)

Download attachment ".config" of type "application/xml" (275903 bytes)

Download attachment "kernel1.log" of type "application/octet-stream" (149353 bytes)

Download attachment "kernel0.log" of type "application/octet-stream" (151246 bytes)

Download attachment "report1.log" of type "application/octet-stream" (3302 bytes)

Download attachment "report2.log" of type "application/octet-stream" (3361 bytes)

Download attachment "report0.log" of type "application/octet-stream" (3414 bytes)