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@xxxxxxxxxxxxxxxxxxxxxxxxx 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@xxxxxxxxxxxxxxxx. 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
