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Date: Sun, 14 Apr 2024 17:11:18 -0700
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Subject: [syzbot] [nilfs?] kernel BUG in submit_bh_wbc
From: syzbot <syzbot+3a841e887ad90c07541a@syzkaller.appspotmail.com>
To: akpm@linux-foundation.org, konishi.ryusuke@gmail.com, 
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, 
	linux-nilfs@vger.kernel.org, syzkaller-bugs@googlegroups.com
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Hello,

syzbot found the following issue on:

HEAD commit:    fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.kernel..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13f8135b180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4d90a36f0cab495a
dashboard link: https://syzkaller.appspot.com/bug?extid=3a841e887ad90c07541a
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=11a7a983180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16c5a29d180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/72ab73815344/disk-fe46a7dd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2d6d6b0d7071/vmlinux-fe46a7dd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/48e275e5478b/bzImage-fe46a7dd.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/12d8fad50ce0/mount_0.gz

The issue was bisected to:

commit 602ce7b8e1343b19c0cf93a3dd1926838ac5a1cc
Author: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Date:   Fri Jan 27 13:22:02 2023 +0000

    nilfs2: prevent WARNING in nilfs_dat_commit_end()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=128df913180000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=118df913180000
console output: https://syzkaller.appspot.com/x/log.txt?x=168df913180000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3a841e887ad90c07541a@syzkaller.appspotmail.com
Fixes: 602ce7b8e134 ("nilfs2: prevent WARNING in nilfs_dat_commit_end()")

NILFS (loop0): discard dirty block: blocknr=18446744073709551615, size=1024
NILFS (loop0): nilfs_get_block (ino=18): a race condition while inserting a data block at offset=0
------------[ cut here ]------------
kernel BUG at fs/buffer.c:2768!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 PID: 5056 Comm: syz-executor429 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:submit_bh_wbc+0x543/0x560 fs/buffer.c:2768
Code: 07 7d ff be 00 10 00 00 48 c7 c7 80 f8 26 8e 4c 89 fa e8 f0 cd be 02 e9 98 fe ff ff e8 86 07 7d ff 90 0f 0b e8 7e 07 7d ff 90 <0f> 0b e8 76 07 7d ff 90 0f 0b e8 6e 07 7d ff 90 0f 0b e8 66 07 7d
RSP: 0018:ffffc9000399f838 EFLAGS: 00010293
RAX: ffffffff8217ecd2 RBX: 0000000000000000 RCX: ffff88807cfe3c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8217e833 R09: 1ffff1100f095cae
R10: dffffc0000000000 R11: ffffed100f095caf R12: 0000000000000000
R13: ffff8880784ae570 R14: 0000000000000000 R15: 1ffff1100f095cae
FS:  00005555917ee380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000066c7e0 CR3: 000000007f430000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 submit_bh fs/buffer.c:2809 [inline]
 __bh_read fs/buffer.c:3074 [inline]
 bh_read_nowait include/linux/buffer_head.h:417 [inline]
 __block_write_begin_int+0x12d0/0x1a70 fs/buffer.c:2134
 __block_write_begin fs/buffer.c:2154 [inline]
 block_write_begin+0x9b/0x1e0 fs/buffer.c:2213
 nilfs_write_begin+0xa0/0x110 fs/nilfs2/inode.c:262
 generic_perform_write+0x322/0x640 mm/filemap.c:3930
 __generic_file_write_iter+0x1b8/0x230 mm/filemap.c:4022
 generic_file_write_iter+0xaf/0x310 mm/filemap.c:4051
 call_write_iter include/linux/fs.h:2108 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa84/0xcb0 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f3d6ccdd9f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc74baec58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0073746e6576652e RCX: 00007f3d6ccdd9f9
RDX: 0000000000000020 RSI: 0000000020000140 RDI: 0000000000000005
RBP: 652e79726f6d656d R08: 00000000000b15f8 R09: 00000000000b15f8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc74baee28 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:submit_bh_wbc+0x543/0x560 fs/buffer.c:2768
Code: 07 7d ff be 00 10 00 00 48 c7 c7 80 f8 26 8e 4c 89 fa e8 f0 cd be 02 e9 98 fe ff ff e8 86 07 7d ff 90 0f 0b e8 7e 07 7d ff 90 <0f> 0b e8 76 07 7d ff 90 0f 0b e8 6e 07 7d ff 90 0f 0b e8 66 07 7d
RSP: 0018:ffffc9000399f838 EFLAGS: 00010293
RAX: ffffffff8217ecd2 RBX: 0000000000000000 RCX: ffff88807cfe3c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8217e833 R09: 1ffff1100f095cae
R10: dffffc0000000000 R11: ffffed100f095caf R12: 0000000000000000
R13: ffff8880784ae570 R14: 0000000000000000 R15: 1ffff1100f095cae
FS:  00005555917ee380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000066c7e0 CR3: 000000007f430000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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