Hello, syzbot found the following issue on: HEAD commit: 0dd2a6fb1e34 Merge tag 'tty-6.4-rc3' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14343765280000 kernel config: https://syzkaller.appspot.com/x/.config?x=9afc9b1b9107cdcd dashboard link: https://syzkaller.appspot.com/bug?extid=0ad741797f4565e7e2d2 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1746d572280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/df4d9c4d67a3/disk-0dd2a6fb.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/76f164dda927/vmlinux-0dd2a6fb.xz kernel image: https://storage.googleapis.com/syzbot-assets/3f4f63ee8d7e/bzImage-0dd2a6fb.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/420107162e49/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0ad741797f4565e7e2d2@xxxxxxxxxxxxxxxxxxxxxxxxx NILFS (loop1): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds general protection fault, probably for non-canonical address 0xdffffc000000003d: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000001e8-0x00000000000001ef] CPU: 0 PID: 5383 Comm: segctord Not tainted 6.4.0-rc2-syzkaller-00330-g0dd2a6fb1e34 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 RIP: 0010:__lock_acquire+0xdce/0x5df0 kernel/locking/lockdep.c:4942 Code: 00 00 3b 05 04 82 59 0f 0f 87 42 0a 00 00 41 be 01 00 00 00 e9 83 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 19 32 00 00 48 81 3b 20 08 16 90 0f 84 06 f3 ff RSP: 0018:ffffc9000549f618 EFLAGS: 00010012 RAX: dffffc0000000000 RBX: 00000000000001e8 RCX: 0000000000000000 RDX: 000000000000003d RSI: 0000000000000000 RDI: 00000000000001e8 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88802009bb80 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000016b15000 CR4: 0000000000350ef0 Call Trace: <TASK> lock_acquire kernel/locking/lockdep.c:5691 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5656 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:350 [inline] folio_create_empty_buffers+0xb0/0x470 fs/buffer.c:1615 nilfs_lookup_dirty_data_buffers+0x580/0x6f0 fs/nilfs2/segment.c:730 nilfs_segctor_scan_file+0x1b1/0x6f0 fs/nilfs2/segment.c:1075 nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1197 [inline] nilfs_segctor_collect fs/nilfs2/segment.c:1524 [inline] nilfs_segctor_do_construct+0x267f/0x7200 fs/nilfs2/segment.c:2070 nilfs_segctor_construct+0x8e3/0xb30 fs/nilfs2/segment.c:2404 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2512 [inline] nilfs_segctor_thread+0x3c7/0xf30 fs/nilfs2/segment.c:2595 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__lock_acquire+0xdce/0x5df0 kernel/locking/lockdep.c:4942 Code: 00 00 3b 05 04 82 59 0f 0f 87 42 0a 00 00 41 be 01 00 00 00 e9 83 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 19 32 00 00 48 81 3b 20 08 16 90 0f 84 06 f3 ff RSP: 0018:ffffc9000549f618 EFLAGS: 00010012 RAX: dffffc0000000000 RBX: 00000000000001e8 RCX: 0000000000000000 RDX: 000000000000003d RSI: 0000000000000000 RDI: 00000000000001e8 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88802009bb80 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000016b15000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 3b 05 04 82 59 0f cmp 0xf598204(%rip),%eax # 0xf59820c 8: 0f 87 42 0a 00 00 ja 0xa50 e: 41 be 01 00 00 00 mov $0x1,%r14d 14: e9 83 00 00 00 jmpq 0x9c 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 da mov %rbx,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 19 32 00 00 jne 0x324d 34: 48 81 3b 20 08 16 90 cmpq $0xffffffff90160820,(%rbx) 3b: 0f .byte 0xf 3c: 84 06 test %al,(%rsi) 3e: f3 repz 3f: ff .byte 0xff --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to change 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
