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: 5283 Comm: f2fs_ckpt-7:3 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 d0 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:ffffc90000fcec30 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888126232780 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000fcecb0 R08: ffff888126232780 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888122cf3878 R14: ffff88811a4800c0 R15: ffff88811a480000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fab6b2f1000 CR3: 00000001230ab000 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+0xae1/0x16e0 fs/f2fs/data.c:2816
 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
 __filemap_fdatawrite mm/filemap.c:435 [inline]
 filemap_fdatawrite+0x26/0x30 mm/filemap.c:440
 f2fs_sync_dirty_inodes+0x25c/0x7a0 fs/f2fs/checkpoint.c:1118
 block_operations fs/f2fs/checkpoint.c:1251 [inline]
 f2fs_write_checkpoint+0xa39/0x1ee0 fs/f2fs/checkpoint.c:1661
 __write_checkpoint_sync fs/f2fs/checkpoint.c:1778 [inline]
 __checkpoint_and_complete_reqs+0xf1/0x3d0 fs/f2fs/checkpoint.c:1797
 issue_checkpoint_thread+0xd4/0x250 fs/f2fs/checkpoint.c:1828
 kthread+0x346/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Modules linked in:
---[ end trace 8e8012520efeeb5d ]---
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 d0 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:ffffc90000fcec30 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888126232780 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000fcecb0 R08: ffff888126232780 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888122cf3878 R14: ffff88811a4800c0 R15: ffff88811a480000
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c310501 CR3: 0000000117090000 CR4: 00000000003506a0
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 d0 1b 92 ff       	call   0xff921bec
  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