linux-kernel - Re: [syzbot] [ext4?] WARNING in __find_get

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Message-ID: <6760e54e.050a0220.37aaf.0143.GAE@google.com>
Date: Mon, 16 Dec 2024 18:43:26 -0800
From: syzbot <syzbot+3c9f079f8fb1d7d331be@...kaller.appspotmail.com>
To: hirofumi@...l.parknet.co.jp, jack@...e.com, linux-ext4@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: Re: [syzbot] [ext4?] WARNING in __find_get_block (2)

syzbot has found a reproducer for the following issue on:

HEAD commit:    f44d154d6e3d Merge tag 'soc-fixes-6.13' of git://git.kerne..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=14d627e8580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1234f097ee657d8b
dashboard link: https://syzkaller.appspot.com/bug?extid=3c9f079f8fb1d7d331be
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=15e302df980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1265b4f8580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a0fb07264d5d/disk-f44d154d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/adf6a39fbd67/vmlinux-f44d154d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d07b6ebb722e/bzImage-f44d154d.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/2fe321e2e902/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3c9f079f8fb1d7d331be@...kaller.appspotmail.com

------------[ cut here ]------------
VFS: brelse: Trying to free free buffer
WARNING: CPU: 1 PID: 5156 at fs/buffer.c:1229 __brelse fs/buffer.c:1229 [inline]
WARNING: CPU: 1 PID: 5156 at fs/buffer.c:1229 brelse include/linux/buffer_head.h:324 [inline]
WARNING: CPU: 1 PID: 5156 at fs/buffer.c:1229 bh_lru_install fs/buffer.c:1346 [inline]
WARNING: CPU: 1 PID: 5156 at fs/buffer.c:1229 __find_get_block+0x109d/0x1150 fs/buffer.c:1400
Modules linked in:
CPU: 1 UID: 0 PID: 5156 Comm: jbd2/sda1-8 Not tainted 6.13.0-rc3-syzkaller-00017-gf44d154d6e3d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
RIP: 0010:__brelse fs/buffer.c:1229 [inline]
RIP: 0010:brelse include/linux/buffer_head.h:324 [inline]
RIP: 0010:bh_lru_install fs/buffer.c:1346 [inline]
RIP: 0010:__find_get_block+0x109d/0x1150 fs/buffer.c:1400
Code: c7 3c 9a e8 d5 60 dc ff e9 1b f7 ff ff e8 5b 83 78 ff e9 87 f7 ff ff e8 51 83 78 ff 90 48 c7 c7 20 ee 18 8c e8 74 26 39 ff 90 <0f> 0b 90 90 e9 6b f7 ff ff e8 35 83 78 ff 48 c7 c7 40 c8 a8 8e 4c
RSP: 0018:ffffc9001048f440 EFLAGS: 00010246
RAX: 8c4056f058b05800 RBX: 0000000000000000 RCX: ffff888035151e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9001048f570 R08: ffffffff81601962 R09: fffffbfff1cfa210
R10: dffffc0000000000 R11: fffffbfff1cfa210 R12: ffff88807a001828
R13: ffff8880b87398b0 R14: ffff88807f336910 R15: ffff88807f335a58
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1a9566c130 CR3: 000000006602e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __getblk_slow fs/buffer.c:1127 [inline]
 bdev_getblk+0x189/0x670 fs/buffer.c:1431
 __getblk include/linux/buffer_head.h:380 [inline]
 jbd2_journal_get_descriptor_buffer+0x1c3/0x4e0 fs/jbd2/journal.c:968
 journal_submit_commit_record+0x11e/0xa90 fs/jbd2/commit.c:129
 jbd2_journal_commit_transaction+0x3c10/0x6560 fs/jbd2/commit.c:877
 kjournald2+0x41c/0x7b0 fs/jbd2/journal.c:201
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.