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: 3877 Comm: segctord Not tainted 6.1.35-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 RIP: 0010:__lock_acquire+0x69/0x1f80 kernel/locking/lockdep.c:4926 Code: df 0f b6 04 10 84 c0 0f 85 fb 15 00 00 83 3d f1 85 e9 0c 00 0f 84 a8 14 00 00 83 3d c0 79 75 0b 00 74 2b 4c 89 f0 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 f7 e8 39 46 76 00 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc90003e7f0a0 EFLAGS: 00010002 RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 00000000000001e8 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000 R13: ffff888027da5940 R14: 00000000000001e8 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 000000001eaad000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:350 [inline] create_empty_buffers+0xd1/0x7d0 fs/buffer.c:1552 nilfs_lookup_dirty_data_buffers+0x2fc/0x8d0 fs/nilfs2/segment.c:729 nilfs_segctor_scan_file+0x245/0xad0 fs/nilfs2/segment.c:1073 nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1195 [inline] nilfs_segctor_collect fs/nilfs2/segment.c:1522 [inline] nilfs_segctor_do_construct+0x1c1b/0x6cc0 fs/nilfs2/segment.c:2068 nilfs_segctor_construct+0x145/0x8c0 fs/nilfs2/segment.c:2402 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2510 [inline] nilfs_segctor_thread+0x536/0x1130 fs/nilfs2/segment.c:2593 kthread+0x26e/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__lock_acquire+0x69/0x1f80 kernel/locking/lockdep.c:4926 Code: df 0f b6 04 10 84 c0 0f 85 fb 15 00 00 83 3d f1 85 e9 0c 00 0f 84 a8 14 00 00 83 3d c0 79 75 0b 00 74 2b 4c 89 f0 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 f7 e8 39 46 76 00 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc90003e7f0a0 EFLAGS: 00010002 RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 00000000000001e8 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000 R13: ffff888027da5940 R14: 00000000000001e8 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 000000001eaad000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: df 0f fisttps (%rdi) 2: b6 04 mov $0x4,%dh 4: 10 84 c0 0f 85 fb 15 adc %al,0x15fb850f(%rax,%rax,8) b: 00 00 add %al,(%rax) d: 83 3d f1 85 e9 0c 00 cmpl $0x0,0xce985f1(%rip) # 0xce98605 14: 0f 84 a8 14 00 00 je 0x14c2 1a: 83 3d c0 79 75 0b 00 cmpl $0x0,0xb7579c0(%rip) # 0xb7579e1 21: 74 2b je 0x4e 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) <-- trapping instruction 2e: 74 12 je 0x42 30: 4c 89 f7 mov %r14,%rdi 33: e8 39 46 76 00 callq 0x764671 38: 48 rex.W 39: ba 00 00 00 00 mov $0x0,%edx 3e: 00 fc add %bh,%ah