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Message-ID: <000000000000df10660604b3b2e1@google.com>
Date: Wed, 06 Sep 2023 10:01:46 -0700
From: syzbot <syzbot+b933ce9cda6c5c8ac3f4@...kaller.appspotmail.com>
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
reiserfs-devel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [reiserfs?] divide error in flush_journal_list (2)
Hello,
syzbot found the following issue on:
HEAD commit: 0468be89b3fa Merge tag 'iommu-updates-v6.6' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16bfd224680000
kernel config: https://syzkaller.appspot.com/x/.config?x=3d78b3780d210e21
dashboard link: https://syzkaller.appspot.com/bug?extid=b933ce9cda6c5c8ac3f4
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f3914b539822/disk-0468be89.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6128b0644784/vmlinux-0468be89.xz
kernel image: https://storage.googleapis.com/syzbot-assets/349d98668c3a/bzImage-0468be89.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b933ce9cda6c5c8ac3f4@...kaller.appspotmail.com
divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 6731 Comm: syz-executor.2 Not tainted 6.5.0-syzkaller-10885-g0468be89b3fa #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:flush_journal_list+0x1045/0x1c70 fs/reiserfs/journal.c:1592
Code: c0 0f 85 eb 0a 00 00 4f 8d 7c 3e 02 48 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 4d 89 e6 0f 85 ee 0a 00 00 8b 0b 4c 89 f8 31 d2 <48> f7 f1 48 89 d3 43 0f b6 44 35 00 84 c0 0f 85 f2 0a 00 00 48 8b
RSP: 0018:ffffc9001605f1f8 EFLAGS: 00010246
RAX: 00000000000000bd RBX: ffff888038e84014 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888038e84017 R08: ffffffff8236f8fb R09: 1ffff11007cd8e63
R10: dffffc0000000000 R11: ffffed1007cd8e64 R12: dffffc0000000000
R13: 1ffff11010333c97 R14: dffffc0000000000 R15: 00000000000000bd
FS: 00007f4d273776c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555597d978 CR3: 000000007d829000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
flush_used_journal_lists+0x1256/0x15d0 fs/reiserfs/journal.c:1829
do_journal_end+0x39fb/0x4780
do_journal_begin_r+0x970/0x1020
journal_begin+0x14c/0x360 fs/reiserfs/journal.c:3260
reiserfs_fill_super+0x1853/0x2620 fs/reiserfs/super.c:2104
mount_bdev+0x237/0x300 fs/super.c:1629
legacy_get_tree+0xef/0x190 fs/fs_context.c:638
vfs_get_tree+0x8c/0x280 fs/super.c:1750
do_new_mount+0x28f/0xae0 fs/namespace.c:3335
do_mount fs/namespace.c:3675 [inline]
__do_sys_mount fs/namespace.c:3884 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3861
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f4d2667e1ea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4d27376ee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4d27376f80 RCX: 00007f4d2667e1ea
RDX: 00000000200000c0 RSI: 0000000020000040 RDI: 00007f4d27376f40
RBP: 00000000200000c0 R08: 00007f4d27376f80 R09: 0000000000008000
R10: 0000000000008000 R11: 0000000000000202 R12: 0000000020000040
R13: 00007f4d27376f40 R14: 0000000000001126 R15: 0000000020000300
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:flush_journal_list+0x1045/0x1c70 fs/reiserfs/journal.c:1592
Code: c0 0f 85 eb 0a 00 00 4f 8d 7c 3e 02 48 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 4d 89 e6 0f 85 ee 0a 00 00 8b 0b 4c 89 f8 31 d2 <48> f7 f1 48 89 d3 43 0f b6 44 35 00 84 c0 0f 85 f2 0a 00 00 48 8b
RSP: 0018:ffffc9001605f1f8 EFLAGS: 00010246
RAX: 00000000000000bd RBX: ffff888038e84014 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888038e84017 R08: ffffffff8236f8fb R09: 1ffff11007cd8e63
R10: dffffc0000000000 R11: ffffed1007cd8e64 R12: dffffc0000000000
R13: 1ffff11010333c97 R14: dffffc0000000000 R15: 00000000000000bd
FS: 00007f4d273776c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200016c0 CR3: 000000007d829000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: c0 0f 85 rorb $0x85,(%rdi)
3: eb 0a jmp 0xf
5: 00 00 add %al,(%rax)
7: 4f 8d 7c 3e 02 lea 0x2(%r14,%r15,1),%r15
c: 48 89 e8 mov %rbp,%rax
f: 48 c1 e8 03 shr $0x3,%rax
13: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax
18: 84 c0 test %al,%al
1a: 4d 89 e6 mov %r12,%r14
1d: 0f 85 ee 0a 00 00 jne 0xb11
23: 8b 0b mov (%rbx),%ecx
25: 4c 89 f8 mov %r15,%rax
28: 31 d2 xor %edx,%edx
* 2a: 48 f7 f1 div %rcx <-- trapping instruction
2d: 48 89 d3 mov %rdx,%rbx
30: 43 0f b6 44 35 00 movzbl 0x0(%r13,%r14,1),%eax
36: 84 c0 test %al,%al
38: 0f 85 f2 0a 00 00 jne 0xb30
3e: 48 rex.W
3f: 8b .byte 0x8b
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
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