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: 6126 Comm: segctord Not tainted 6.4.0-rc7-syzkaller-00194-g8a28a0b6f1a1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 RIP: 0010:__lock_acquire+0x69/0x2070 kernel/locking/lockdep.c:4956 Code: df 0f b6 04 30 84 c0 0f 85 d8 16 00 00 83 3d 11 b6 0b 0d 00 0f 84 83 11 00 00 83 3d 60 80 94 0b 00 74 2b 4c 89 f0 48 c1 e8 03 <80> 3c 30 00 74 12 4c 89 f7 e8 a9 76 7a 00 48 be 00 00 00 00 00 fc RSP: 0018:ffffc900077e7088 EFLAGS: 00010002 RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 00000000000001e8 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001 R13: 0000000000000000 R14: 00000000000001e8 R15: ffff88802c605940 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1084f87718 CR3: 0000000076950000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1df/0x520 kernel/locking/lockdep.c:5705 __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] folio_create_empty_buffers+0xca/0x740 fs/buffer.c:1615 nilfs_lookup_dirty_data_buffers+0x358/0x980 fs/nilfs2/segment.c:730 nilfs_segctor_scan_file+0x239/0xa00 fs/nilfs2/segment.c:1080 nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1202 [inline] nilfs_segctor_collect fs/nilfs2/segment.c:1529 [inline] nilfs_segctor_do_construct+0x1c1b/0x6dd0 fs/nilfs2/segment.c:2077 nilfs_segctor_construct+0x145/0x8c0 fs/nilfs2/segment.c:2411 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2519 [inline] nilfs_segctor_thread+0x536/0x1130 fs/nilfs2/segment.c:2602 kthread+0x2b0/0x340 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__lock_acquire+0x69/0x2070 kernel/locking/lockdep.c:4956 Code: df 0f b6 04 30 84 c0 0f 85 d8 16 00 00 83 3d 11 b6 0b 0d 00 0f 84 83 11 00 00 83 3d 60 80 94 0b 00 74 2b 4c 89 f0 48 c1 e8 03 <80> 3c 30 00 74 12 4c 89 f7 e8 a9 76 7a 00 48 be 00 00 00 00 00 fc RSP: 0018:ffffc900077e7088 EFLAGS: 00010002 RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 00000000000001e8 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001 R13: 0000000000000000 R14: 00000000000001e8 R15: ffff88802c605940 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1084f87718 CR3: 0000000076950000 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: 30 84 c0 0f 85 d8 16 xor %al,0x16d8850f(%rax,%rax,8) b: 00 00 add %al,(%rax) d: 83 3d 11 b6 0b 0d 00 cmpl $0x0,0xd0bb611(%rip) # 0xd0bb625 14: 0f 84 83 11 00 00 je 0x119d 1a: 83 3d 60 80 94 0b 00 cmpl $0x0,0xb948060(%rip) # 0xb948081 21: 74 2b je 0x4e 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 30 00 cmpb $0x0,(%rax,%rsi,1) <-- trapping instruction 2e: 74 12 je 0x42 30: 4c 89 f7 mov %r14,%rdi 33: e8 a9 76 7a 00 callq 0x7a76e1 38: 48 rex.W 39: be 00 00 00 00 mov $0x0,%esi 3e: 00 fc add %bh,%ah