[reiserfs?] divide error in do_journal_end (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3f8a27f9e27b Linux 4.19.211
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=169d88ed480000
kernel config: https://syzkaller.appspot.com/x/.config?x=9b9277b418617afe
dashboard link: https://syzkaller.appspot.com/bug?extid=aeadcafb8320c83999a8
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14fd2cb9480000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13ecbe1e480000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/98c0bdb4abb3/disk-3f8a27f9.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ea228ff02669/vmlinux-3f8a27f9.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/a1910246b508/mount_0.gz

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

REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
audit: type=1800 audit(1674788210.910:2): pid=8118 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor349" name="bus" dev="loop0" ino=4 res=0
divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8118 Comm: syz-executor349 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
RIP: 0010:do_journal_end+0x15be/0x4840 fs/reiserfs/journal.c:4103
Code: c6 41 84 f0 0f 85 51 2b 00 00 83 e2 07 38 d1 40 0f 9e c6 84 c9 0f 95 c2 40 84 d6 0f 85 3a 2b 00 00 8b 4b 14 48 8d 7d 18 31 d2 <48> f7 f1 4a 8d 34 2a 48 89 fa 48 b8 00 00 00 00 00 fc ff df 48 c1
RSP: 0018:ffff8880b14a7a08 EFLAGS: 00010246
RAX: 0000000000000003 RBX: ffff88809ed7e000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880afc0d458
RBP: ffff8880afc0d440 R08: 0000000000000001 R09: ffffed101606fdff
R10: ffff8880b037effb R11: 0000000000000000 R12: 0000000000001000
R13: 0000000000000000 R14: ffff88808db0dbd0 R15: ffffc90001b22000
FS: 000055555704a300(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5e15eda4f8 CR3: 00000000a110b000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
reiserfs_sync_fs+0xf8/0x120 fs/reiserfs/super.c:78
__sync_filesystem fs/sync.c:39 [inline]
sync_filesystem+0x105/0x250 fs/sync.c:64
generic_shutdown_super+0x70/0x370 fs/super.c:442
kill_block_super+0x97/0xf0 fs/super.c:1185
deactivate_locked_super+0x94/0x160 fs/super.c:329
deactivate_super+0x174/0x1a0 fs/super.c:360
cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098
task_work_run+0x148/0x1c0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0xbf3/0x2be0 kernel/exit.c:870
do_group_exit+0x125/0x310 kernel/exit.c:967
__do_sys_exit_group kernel/exit.c:978 [inline]
__se_sys_exit_group kernel/exit.c:976 [inline]
__x64_sys_exit_group+0x3a/0x50 kernel/exit.c:976
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f5e15e95af9
Code: Bad RIP value.
RSP: 002b:00007fff3de333b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f5e15f0b350 RCX: 00007f5e15e95af9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00007f5e15f05e40
R10: 000000000001ff01 R11: 0000000000000246 R12: 00007f5e15f0b350
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
Modules linked in:
---[ end trace 166482dce4a0b3ea ]---
RIP: 0010:do_journal_end+0x15be/0x4840 fs/reiserfs/journal.c:4103
Code: c6 41 84 f0 0f 85 51 2b 00 00 83 e2 07 38 d1 40 0f 9e c6 84 c9 0f 95 c2 40 84 d6 0f 85 3a 2b 00 00 8b 4b 14 48 8d 7d 18 31 d2 <48> f7 f1 4a 8d 34 2a 48 89 fa 48 b8 00 00 00 00 00 fc ff df 48 c1
RSP: 0018:ffff8880b14a7a08 EFLAGS: 00010246
RAX: 0000000000000003 RBX: ffff88809ed7e000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880afc0d458
RBP: ffff8880afc0d440 R08: 0000000000000001 R09: ffffed101606fdff
R10: ffff8880b037effb R11: 0000000000000000 R12: 0000000000001000
R13: 0000000000000000 R14: ffff88808db0dbd0 R15: ffffc90001b22000
FS: 000055555704a300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f40ac039108 CR3: 00000000b5be1000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: c6 41 84 f0 movb $0xf0,-0x7c(%rcx)
4: 0f 85 51 2b 00 00 jne 0x2b5b
a: 83 e2 07 and $0x7,%edx
d: 38 d1 cmp %dl,%cl
f: 40 0f 9e c6 setle %sil
13: 84 c9 test %cl,%cl
15: 0f 95 c2 setne %dl
18: 40 84 d6 test %dl,%sil
1b: 0f 85 3a 2b 00 00 jne 0x2b5b
21: 8b 4b 14 mov 0x14(%rbx),%ecx
24: 48 8d 7d 18 lea 0x18(%rbp),%rdi
28: 31 d2 xor %edx,%edx
* 2a: 48 f7 f1 div %rcx <-- trapping instruction
2d: 4a 8d 34 2a lea (%rdx,%r13,1),%rsi
31: 48 89 fa mov %rdi,%rdx
34: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
3b: fc ff df
3e: 48 rex.W
3f: c1 .byte 0xc1


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