syzbot

REISERFS (device loop0): Using r5 hash to sort names
REISERFS warning (device loop0): vs-13060 reiserfs_update_sd_size: stat data of object [1 2 0x0 SD] (nlink == 1) not found (pos 2)
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3541 Comm: syz-executor212 Not tainted 6.1.84-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:do_journal_end+0x1286/0x4870 fs/reiserfs/journal.c:4093
Code: 28 84 c0 0f 85 b8 2f 00 00 4a 8d 5c 32 01 4c 89 e0 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 c5 2f 00 00 41 8b 0f 48 89 d8 31 d2 <48> f7 f1 48 89 d3 48 03 5c 24 40 48 8b 84 24 e8 00 00 00 42 80 3c
RSP: 0018:ffffc90003a8f7e0 EFLAGS: 00010246
RAX: 0000000000000003 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888028e1f000
RBP: ffffc90003a8fa50 R08: dffffc0000000000 R09: ffff888028e1f000
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88807af15017
R13: dffffc0000000000 R14: 0000000000000002 R15: ffff88807af15014
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffb5dafce78 CR3: 000000000ce8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 reiserfs_sync_fs+0xca/0x140 fs/reiserfs/super.c:78
 sync_filesystem+0xe8/0x220 fs/sync.c:56
 generic_shutdown_super+0x6b/0x340 fs/super.c:474
 kill_block_super+0x7a/0xe0 fs/super.c:1459
 deactivate_locked_super+0xa0/0x110 fs/super.c:332
 cleanup_mnt+0x490/0x520 fs/namespace.c:1186
 task_work_run+0x246/0x300 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa73/0x26a0 kernel/exit.c:869
 do_group_exit+0x202/0x2b0 kernel/exit.c:1019
 __do_sys_exit_group kernel/exit.c:1030 [inline]
 __se_sys_exit_group kernel/exit.c:1028 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1028
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ffb5dab2909
Code: Unable to access opcode bytes at 0x7ffb5dab28df.
RSP: 002b:00007ffccc57d278 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007ffb5dab2909
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 00007ffb5db2f2d0 R08: ffffffffffffffb8 R09: 00007ffccc57d350
R10: 00007ffccc57d350 R11: 0000000000000246 R12: 00007ffb5db2f2d0
R13: 0000000000000000 R14: 00007ffb5db30040 R15: 00007ffb5da80e50
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:do_journal_end+0x1286/0x4870 fs/reiserfs/journal.c:4093
Code: 28 84 c0 0f 85 b8 2f 00 00 4a 8d 5c 32 01 4c 89 e0 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 c5 2f 00 00 41 8b 0f 48 89 d8 31 d2 <48> f7 f1 48 89 d3 48 03 5c 24 40 48 8b 84 24 e8 00 00 00 42 80 3c
RSP: 0018:ffffc90003a8f7e0 EFLAGS: 00010246
RAX: 0000000000000003 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888028e1f000
RBP: ffffc90003a8fa50 R08: dffffc0000000000 R09: ffff888028e1f000
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88807af15017
R13: dffffc0000000000 R14: 0000000000000002 R15: ffff88807af15014
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555904e30560 CR3: 000000000ce8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	28 84 c0 0f 85 b8 2f 	sub    %al,0x2fb8850f(%rax,%rax,8)
   7:	00 00                	add    %al,(%rax)
   9:	4a 8d 5c 32 01       	lea    0x1(%rdx,%r14,1),%rbx
   e:	4c 89 e0             	mov    %r12,%rax
  11:	48 c1 e8 03          	shr    $0x3,%rax
  15:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax
  1a:	84 c0                	test   %al,%al
  1c:	0f 85 c5 2f 00 00    	jne    0x2fe7
  22:	41 8b 0f             	mov    (%r15),%ecx
  25:	48 89 d8             	mov    %rbx,%rax
  28:	31 d2                	xor    %edx,%edx
* 2a:	48 f7 f1             	div    %rcx <-- trapping instruction
  2d:	48 89 d3             	mov    %rdx,%rbx
  30:	48 03 5c 24 40       	add    0x40(%rsp),%rbx
  35:	48 8b 84 24 e8 00 00 	mov    0xe8(%rsp),%rax
  3c:	00
  3d:	42                   	rex.X
  3e:	80                   	.byte 0x80
  3f:	3c                   	.byte 0x3c