Date: Sat, 04 May 2024 03:20:24 -0700
From: syzbot <syzbot+d3abed1ad3d367fa2627@...kaller.appspotmail.com>
To: konishi.ryusuke@...il.com, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-nilfs@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [nilfs?] kernel BUG in __block_write_begin_int (2)

Hello,

syzbot found the following issue on:

HEAD commit:    9e4bc4bcae01 Merge tag 'nfs-for-6.9-2' of git://git.linux-..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=12f2ae87180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3714fc09f933e505
dashboard link: https://syzkaller.appspot.com/bug?extid=d3abed1ad3d367fa2627
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=150c697f180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=140de537180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b98a742ff5ed/disk-9e4bc4bc.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/207a8191df7c/vmlinux-9e4bc4bc.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7dd86c3ad0ba/bzImage-9e4bc4bc.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/d35001c4b748/mount_0.gz

Bisection is inconclusive: the issue happens on the oldest tested release.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15526d37180000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=17526d37180000
console output: https://syzkaller.appspot.com/x/log.txt?x=13526d37180000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d3abed1ad3d367fa2627@...kaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at fs/buffer.c:2083!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 PID: 5084 Comm: syz-executor283 Not tainted 6.9.0-rc6-syzkaller-00012-g9e4bc4bcae01 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:__block_write_begin_int+0x19a7/0x1a70 fs/buffer.c:2083
Code: 31 ff e8 ac 35 78 ff 48 89 d8 48 25 ff 0f 00 00 74 27 e8 bc 30 78 ff e9 c6 e7 ff ff e8 b2 30 78 ff 90 0f 0b e8 aa 30 78 ff 90 <0f> 0b e8 a2 30 78 ff 90 0f 0b e8 ca 5d 62 09 48 8b 5c 24 08 48 89
RSP: 0018:ffffc90003327760 EFLAGS: 00010293
RAX: ffffffff821ddf06 RBX: 0000000000007b54 RCX: ffff88802eff3c00
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000000007b54
RBP: ffffc900033278c8 R08: ffffffff821dc733 R09: 1ffffd400006f810
R10: dffffc0000000000 R11: fffff9400006f811 R12: 00fff0000000920d
R13: 0000000000000000 R14: 0000000000001000 R15: 0000000000007b54
FS:  000055556494d480(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055838a10d7f0 CR3: 0000000078508000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 nilfs_prepare_chunk fs/nilfs2/dir.c:86 [inline]
 nilfs_set_link+0xc5/0x2a0 fs/nilfs2/dir.c:411
 nilfs_rename+0x5b2/0xaf0 fs/nilfs2/namei.c:416
 vfs_rename+0xbdd/0xf00 fs/namei.c:4880
 do_renameat2+0xd94/0x13f0 fs/namei.c:5037
 __do_sys_rename fs/namei.c:5084 [inline]
 __se_sys_rename fs/namei.c:5082 [inline]
 __x64_sys_rename+0x86/0xa0 fs/namei.c:5082
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa292c67f99
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 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:00007ffd9d3b0198 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa292c67f99
RDX: 00007fa292c67f99 RSI: 0000000020000040 RDI: 0000000020000180
RBP: 0000000000000000 R08: 00007ffd9d3b01d0 R09: 00007ffd9d3b01d0
R10: 0000000000000f69 R11: 0000000000000246 R12: 00007ffd9d3b01d0
R13: 00007ffd9d3b0458 R14: 431bde82d7b634db R15: 00007fa292cb103b
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__block_write_begin_int+0x19a7/0x1a70 fs/buffer.c:2083
Code: 31 ff e8 ac 35 78 ff 48 89 d8 48 25 ff 0f 00 00 74 27 e8 bc 30 78 ff e9 c6 e7 ff ff e8 b2 30 78 ff 90 0f 0b e8 aa 30 78 ff 90 <0f> 0b e8 a2 30 78 ff 90 0f 0b e8 ca 5d 62 09 48 8b 5c 24 08 48 89
RSP: 0018:ffffc90003327760 EFLAGS: 00010293
RAX: ffffffff821ddf06 RBX: 0000000000007b54 RCX: ffff88802eff3c00
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000000007b54
RBP: ffffc900033278c8 R08: ffffffff821dc733 R09: 1ffffd400006f810
R10: dffffc0000000000 R11: fffff9400006f811 R12: 00fff0000000920d
R13: 0000000000000000 R14: 0000000000001000 R15: 0000000000007b54
FS:  000055556494d480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055838a039e38 CR3: 0000000078508000 CR4: 0000000000350ef0


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection

If the report is already addressed, let syzbot know by replying with:
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