F2FS-fs (loop4): invalid crc value
F2FS-fs (loop4): Found nat_bits in checkpoint
F2FS-fs (loop4): Start checkpoint disabled!
F2FS-fs (loop4): Mounted with checkpoint version = 48b305e6
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: 9282 Comm: syz.4.2443 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2946 [inline]
RIP: 0010:update_sit_entry+0x5b4/0xf70 fs/f2fs/segment.c:2256
Code: 00 00 49 8d 5d 18 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 5a 70 90 ff 48 8b 1b 48 03 5d b0 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 a9 08 00 00 44 0f b6 33 44 89 f0 44 8b
RSP: 0018:ffffc90000cff260 EFLAGS: 00010247
RAX: 0000000000000000 RBX: 0000000000000006 RCX: ffff88810d703b40
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000cff2e0 R08: ffff88810d703b40 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000002 R12: dffffc0000000000
R13: ffff88811cdac2a8 R14: 0000000000000000 R15: ffff88811ab58000
FS:  00007fce0c0d46c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f23bca2a000 CR3: 000000010d410000 CR4: 00000000003526a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 f2fs_allocate_data_block+0x15e8/0x3240 fs/f2fs/segment.c:3457
 __allocate_data_block+0x54d/0xa40 fs/f2fs/data.c:1405
 f2fs_map_blocks+0xf01/0x38f0 fs/f2fs/data.c:1577
 expand_inode_data+0x4b6/0x890 fs/f2fs/file.c:1776
 f2fs_fallocate+0x41c/0x880 fs/f2fs/file.c:1879
 vfs_fallocate+0x4b4/0x590 fs/open.c:309
 ioctl_preallocate fs/ioctl.c:294 [inline]
 file_ioctl fs/ioctl.c:334 [inline]
 do_vfs_ioctl+0x19f8/0x1d80 fs/ioctl.c:853
 __do_sys_ioctl fs/ioctl.c:872 [inline]
 __se_sys_ioctl+0x9f/0x1a0 fs/ioctl.c:860
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:860
 x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fce0d679629
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:00007fce0c0d4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fce0d8f2fa0 RCX: 00007fce0d679629
RDX: 00002000000000c0 RSI: 0000000040305828 RDI: 0000000000000008
RBP: 00007fce0d70fb39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fce0d8f3038 R14: 00007fce0d8f2fa0 R15: 00007ffc461ae438
 </TASK>
Modules linked in:
---[ end trace 9b076c1a40352ff8 ]---
RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2946 [inline]
RIP: 0010:update_sit_entry+0x5b4/0xf70 fs/f2fs/segment.c:2256
Code: 00 00 49 8d 5d 18 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 5a 70 90 ff 48 8b 1b 48 03 5d b0 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 a9 08 00 00 44 0f b6 33 44 89 f0 44 8b
RSP: 0018:ffffc90000cff260 EFLAGS: 00010247
RAX: 0000000000000000 RBX: 0000000000000006 RCX: ffff88810d703b40
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000cff2e0 R08: ffff88810d703b40 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000002 R12: dffffc0000000000
R13: ffff88811cdac2a8 R14: 0000000000000000 R15: ffff88811ab58000
FS:  00007fce0c0d46c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff4dbdec80 CR3: 000000010d410000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	49 8d 5d 18          	lea    0x18(%r13),%rbx
   6:	48 89 d8             	mov    %rbx,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 5a 70 90 ff       	call   0xff907076
  1c:	48 8b 1b             	mov    (%rbx),%rbx
  1f:	48 03 5d b0          	add    -0x50(%rbp),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 a9 08 00 00    	jne    0x8e0
  37:	44 0f b6 33          	movzbl (%rbx),%r14d
  3b:	44 89 f0             	mov    %r14d,%eax
  3e:	44                   	rex.R
  3f:	8b                   	.byte 0x8b