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Date:   Sat, 03 Jun 2023 17:35:55 -0700
Message-ID: <00000000000019a97c05fd42f8c8@google.com>
Subject: [syzbot] [nilfs?] kernel BUG in end_buffer_async_write
From:   syzbot <syzbot+5c04210f7c7f897c1e7f@syzkaller.appspotmail.com>
To:     brauner@kernel.org, konishi.ryusuke@gmail.com,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-nilfs@vger.kernel.org, syzkaller-bugs@googlegroups.com,
        viro@zeniv.linux.org.uk
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Hello,

syzbot found the following issue on:

HEAD commit:    51f269a6ecc7 Merge tag 'probes-fixes-6.4-rc4' of git://git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15ed0e7d280000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3da6c5d3e0a6c932
dashboard link: https://syzkaller.appspot.com/bug?extid=5c04210f7c7f897c1e7f
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1336c6b5280000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12c0a5a5280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8a8c8e41a6b0/disk-51f269a6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ffc3737b4233/vmlinux-51f269a6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d49888e5beb1/bzImage-51f269a6.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/99d35f050c12/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5c04210f7c7f897c1e7f@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at fs/buffer.c:391!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.4.0-rc4-syzkaller-00268-g51f269a6ecc7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
RIP: 0010:end_buffer_async_write+0x2db/0x340 fs/buffer.c:391
Code: 65 00 fe 4c 89 ff e8 d4 a3 ff ff be 08 00 00 00 48 89 c7 48 89 c3 e8 b4 31 e0 ff f0 80 4b 01 01 e9 07 fe ff ff e8 45 62 8d ff <0f> 0b e8 3e 62 8d ff 0f 0b 48 89 df e8 34 2b e0 ff e9 d9 fe ff ff
RSP: 0018:ffffc90000147c98 EFLAGS: 00010246

RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000100
RDX: ffff88801664bb80 RSI: ffffffff81f6e3fb RDI: 0000000000000001
RBP: ffff88806fbde570 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff81f6e120 R14: ffff88801e24ee00 R15: ffff88802a45a788
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f42b45b0000 CR3: 000000007b04a000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 end_bio_bh_io_sync+0xde/0x130 fs/buffer.c:2730
 bio_endio+0x5af/0x6c0 block/bio.c:1608
 req_bio_endio block/blk-mq.c:761 [inline]
 blk_update_request+0x5c5/0x1620 block/blk-mq.c:906
 blk_mq_end_request+0x59/0x4c0 block/blk-mq.c:1023
 lo_complete_rq+0x1c6/0x280 drivers/block/loop.c:370
 blk_complete_reqs+0xad/0xe0 block/blk-mq.c:1101
 __do_softirq+0x1d4/0x905 kernel/softirq.c:571
 run_ksoftirqd kernel/softirq.c:939 [inline]
 run_ksoftirqd+0x31/0x60 kernel/softirq.c:931
 smpboot_thread_fn+0x659/0x9e0 kernel/smpboot.c:164
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:end_buffer_async_write+0x2db/0x340 fs/buffer.c:391
Code: 65 00 fe 4c 89 ff e8 d4 a3 ff ff be 08 00 00 00 48 89 c7 48 89 c3 e8 b4 31 e0 ff f0 80 4b 01 01 e9 07 fe ff ff e8 45 62 8d ff <0f> 0b e8 3e 62 8d ff 0f 0b 48 89 df e8 34 2b e0 ff e9 d9 fe ff ff
RSP: 0018:ffffc90000147c98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000100
RDX: ffff88801664bb80 RSI: ffffffff81f6e3fb RDI: 0000000000000001
RBP: ffff88806fbde570 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff81f6e120 R14: ffff88801e24ee00 R15: ffff88802a45a788
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f42b45b0000 CR3: 000000007b04a000 CR4: 0000000000350ef0


---
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