general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 4128 Comm: syz.2.897 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:3025 [inline] RIP: 0010:update_sit_entry_for_alloc fs/f2fs/segment.c:2399 [inline] RIP: 0010:update_sit_entry+0x4ce/0x1580 fs/f2fs/segment.c:2443 Code: 8b 45 d0 48 8d 58 18 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 0f 1c 8a ff 48 8b 1b 4c 01 fb 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 6f 0f 00 00 44 0f b6 33 44 89 f0 44 08 RSP: 0018:ffffc90000f07158 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: ffff88811e37a880 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000f07230 R08: ffff888130c20006 R09: 1ffff11026184000 R10: dffffc0000000000 R11: ffffed1026184001 R12: 0000000000000080 R13: dffffc0000000000 R14: ffff888130864000 R15: 0000000000000000 FS: 00007f95699aa6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31018ff8 CR3: 0000000131f8f000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: f2fs_allocate_data_block+0x1499/0x3d90 fs/f2fs/segment.c:3515 __allocate_data_block fs/f2fs/data.c:1501 [inline] f2fs_map_blocks+0x14d8/0x4600 fs/f2fs/data.c:1716 f2fs_expand_inode_data+0x6ef/0xb80 fs/f2fs/file.c:1869 f2fs_fallocate+0x3d6/0x750 fs/f2fs/file.c:1970 vfs_fallocate+0x4ca/0x5a0 fs/open.c:324 ioctl_preallocate fs/ioctl.c:290 [inline] file_ioctl fs/ioctl.c:330 [inline] do_vfs_ioctl+0x1947/0x1cd0 fs/ioctl.c:849 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl+0x9f/0x1b0 fs/ioctl.c:856 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856 x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f9568b9f559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f95699aa028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9568e26180 RCX: 00007f9568b9f559 RDX: 0000200000000040 RSI: 0000000040305828 RDI: 0000000000000004 RBP: 00007f9568c36b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9568e26218 R14: 00007f9568e26180 R15: 00007ffd6e1e5888 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:3025 [inline] RIP: 0010:update_sit_entry_for_alloc fs/f2fs/segment.c:2399 [inline] RIP: 0010:update_sit_entry+0x4ce/0x1580 fs/f2fs/segment.c:2443 Code: 8b 45 d0 48 8d 58 18 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 0f 1c 8a ff 48 8b 1b 4c 01 fb 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 6f 0f 00 00 44 0f b6 33 44 89 f0 44 08 RSP: 0018:ffffc90000f07158 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: ffff88811e37a880 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000f07230 R08: ffff888130c20006 R09: 1ffff11026184000 R10: dffffc0000000000 R11: ffffed1026184001 R12: 0000000000000080 R13: dffffc0000000000 R14: ffff888130864000 R15: 0000000000000000 FS: 00007f95699aa6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6836df62f8 CR3: 0000000131f8f000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 8b 45 d0 mov -0x30(%rbp),%eax 3: 48 8d 58 18 lea 0x18(%rax),%rbx 7: 48 89 d8 mov %rbx,%rax a: 48 c1 e8 03 shr $0x3,%rax e: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 13: 74 08 je 0x1d 15: 48 89 df mov %rbx,%rdi 18: e8 0f 1c 8a ff call 0xff8a1c2c 1d: 48 8b 1b mov (%rbx),%rbx 20: 4c 01 fb add %r15,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 6f 0f 00 00 jne 0xfa6 37: 44 0f b6 33 movzbl (%rbx),%r14d 3b: 44 89 f0 mov %r14d,%eax 3e: 44 rex.R 3f: 08 .byte 0x8