F2FS-fs (loop9): invalid crc value
F2FS-fs (loop9): Found nat_bits in checkpoint
F2FS-fs (loop9): Mounted with checkpoint version = 48b305e5
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 2082 Comm: syz.9.482 Not tainted 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:2912 [inline]
RIP: 0010:update_sit_entry+0x58e/0xf50 fs/f2fs/segment.c:2339
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 40 1b 92 ff 48 8b 1b 48 03 5d a8 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 ab 08 00 00 44 0f b6 33 44 89 f0 44 8b
RSP: 0018:ffffc90000c96830 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff88810fbebb40 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000c968b0 R08: ffff88810fbebb40 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88813b6a1b20 R14: ffff8881268f40c0 R15: ffff8881268f4000
FS:  00007f5774b156c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000008000 CR3: 0000000120486000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 f2fs_allocate_data_block+0x159c/0x3a20 fs/f2fs/segment.c:3481
 do_write_page+0x2d9/0x820 fs/f2fs/segment.c:3569
 f2fs_outplace_write_data+0xf6/0x240 fs/f2fs/segment.c:3635
 f2fs_do_write_data_page+0xad4/0x11c0 fs/f2fs/data.c:2716
 f2fs_write_single_data_page+0xa10/0x16e0 fs/f2fs/data.c:2839
 f2fs_write_cache_pages fs/f2fs/data.c:3090 [inline]
 __f2fs_write_data_pages fs/f2fs/data.c:3240 [inline]
 f2fs_write_data_pages+0x1813/0x2950 fs/f2fs/data.c:3267
 do_writepages+0x128/0x280 mm/page-writeback.c:2380
 __filemap_fdatawrite_range+0x2a0/0x350 mm/filemap.c:427
 file_write_and_wait_range+0x8c/0x110 mm/filemap.c:766
 f2fs_do_sync_file+0x404/0x1d80 fs/f2fs/file.c:284
 f2fs_sync_file+0x103/0x150 fs/f2fs/file.c:401
 vfs_fsync_range+0x190/0x1a0 fs/sync.c:202
 generic_write_sync include/linux/fs.h:2920 [inline]
 f2fs_file_write_iter+0x6d9/0x27a0 fs/f2fs/file.c:4933
 call_write_iter include/linux/fs.h:2066 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x758/0xdc0 fs/read_write.c:605
 ksys_write+0x149/0x250 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:667
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f57760ba799
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:00007f5774b15028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f5776333fa0 RCX: 00007f57760ba799
RDX: 0000000000001006 RSI: 00002000000079c0 RDI: 0000000000000007
RBP: 00007f5776150c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5776334038 R14: 00007f5776333fa0 R15: 00007ffde0e5aa68
Modules linked in:
---[ end trace 1a189d8d7da3d1ea ]---
RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2912 [inline]
RIP: 0010:update_sit_entry+0x58e/0xf50 fs/f2fs/segment.c:2339
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 40 1b 92 ff 48 8b 1b 48 03 5d a8 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 ab 08 00 00 44 0f b6 33 44 89 f0 44 8b
RSP: 0018:ffffc90000c96830 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff88810fbebb40 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000c968b0 R08: ffff88810fbebb40 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88813b6a1b20 R14: ffff8881268f40c0 R15: ffff8881268f4000
FS:  00007f5774b156c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6dbe1382f8 CR3: 0000000120486000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
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 40 1b 92 ff       	call   0xff921b5c
  1c:	48 8b 1b             	mov    (%rbx),%rbx
  1f:	48 03 5d a8          	add    -0x58(%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 ab 08 00 00    	jne    0x8e2
  37:	44 0f b6 33          	movzbl (%rbx),%r14d
  3b:	44 89 f0             	mov    %r14d,%eax
  3e:	44                   	rex.R
  3f:	8b                   	.byte 0x8b