linux-kernel - [syzbot] [ext4?] WARNING in ext4_journal_check

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Message-ID: <6711ae3d.050a0220.1e4b4d.000a.GAE@google.com>
Date: Thu, 17 Oct 2024 17:39:25 -0700
From: syzbot <syzbot+b75d75f957975f3d40e3@...kaller.appspotmail.com>
To: adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: [syzbot] [ext4?] WARNING in ext4_journal_check_start (2)

Hello,

syzbot found the following issue on:

HEAD commit:    c964ced77262 Merge tag 'for-linus' of git://git.kernel.org..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=158df45f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cfbd94c114a3d407
dashboard link: https://syzkaller.appspot.com/bug?extid=b75d75f957975f3d40e3
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11361830580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14cc8240580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/45c8600041e4/disk-c964ced7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/71768ca7dfeb/vmlinux-c964ced7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/15d1aaba4355/bzImage-c964ced7.xz
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/cd943498b7b9/mount_0.gz
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/67cd36770cec/mount_2.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b75d75f957975f3d40e3@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 2903 at fs/ext4/ext4_jbd2.c:76 ext4_journal_check_start+0x1f8/0x250 fs/ext4/ext4_jbd2.c:76
Modules linked in:
CPU: 1 UID: 0 PID: 2903 Comm: kworker/u8:6 Not tainted 6.12.0-rc3-syzkaller-00087-gc964ced77262 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: writeback wb_workfn (flush-7:2)
RIP: 0010:ext4_journal_check_start+0x1f8/0x250 fs/ext4/ext4_jbd2.c:76
Code: 5c 41 5d 41 5e 41 5f e9 c1 ca 97 09 e8 01 71 3c ff 41 bf fb ff ff ff eb e2 e8 f4 70 3c ff 90 0f 0b 90 eb d1 e8 e9 70 3c ff 90 <0f> 0b 90 43 80 7c 25 00 00 0f 85 03 ff ff ff e9 06 ff ff ff 89 d9
RSP: 0018:ffffc90009d46c40 EFLAGS: 00010293
RAX: ffffffff82587667 RBX: 0000000000000004 RCX: ffff88802f5a5a00
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004
RBP: 0000000000000001 R08: ffffffff82587564 R09: 1ffff1100f968870
R10: dffffc0000000000 R11: ffffed100f968871 R12: dffffc0000000000
R13: 1ffff1100f9684c7 R14: ffff88807cb42000 R15: ffff88807cb42638
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f60253c26c0 CR3: 000000007ba9e000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __ext4_journal_start_sb+0x181/0x600 fs/ext4/ext4_jbd2.c:105
 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
 ext4_do_writepages+0x112c/0x3d20 fs/ext4/inode.c:2707
 ext4_writepages+0x213/0x3c0 fs/ext4/inode.c:2813
 do_writepages+0x35f/0x870 mm/page-writeback.c:2683
 __writeback_single_inode+0x14f/0x10d0 fs/fs-writeback.c:1658
 writeback_sb_inodes+0x80c/0x1370 fs/fs-writeback.c:1954
 wb_writeback+0x41b/0xbd0 fs/fs-writeback.c:2134
 wb_do_writeback fs/fs-writeback.c:2281 [inline]
 wb_workfn+0x410/0x1090 fs/fs-writeback.c:2321
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa65/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>


---
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