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: 3253 Comm: syz.8.671 Not tainted 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:2914 [inline]
RIP: 0010:update_sit_entry+0x5a4/0xfd0 fs/f2fs/segment.c:2339
Code: 80 3c 08 00 74 08 48 89 df e8 c8 19 92 ff 4c 89 75 b0 48 8b 1b 48 03 5d a8 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 0b 09 00 00 44 0f b6 33 44 89 f0 44 08 e8
RSP: 0018:ffffc90002586db8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: ffff888118cf8000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002586e30 R08: ffff888119d76029 R09: 1ffff110233aec05
R10: dffffc0000000000 R11: ffffed10233aec06 R12: ffff88812586a000
R13: 0000000000000004 R14: ffff88812586a0c0 R15: ffff8881231b9878
FS:  00007f1ceb6646c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1ceb663ff8 CR3: 00000001160bc000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 f2fs_allocate_data_block+0x10c9/0x3880 fs/f2fs/segment.c:3481
 do_write_page+0x2be/0x7e0 fs/f2fs/segment.c:3569
 f2fs_outplace_write_data+0xf6/0x240 fs/f2fs/segment.c:3635
 f2fs_do_write_data_page+0xc88/0x11c0 fs/f2fs/data.c:2716
 f2fs_write_single_data_page+0xdd1/0x1680 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+0x15b0/0x28f0 fs/f2fs/data.c:3267
 do_writepages+0x12e/0x280 mm/page-writeback.c:2380
 __filemap_fdatawrite_range+0x2a0/0x350 mm/filemap.c:427
 filemap_write_and_wait_range+0x65/0x270 mm/filemap.c:660
 f2fs_zero_range+0x204/0x15e0 fs/f2fs/file.c:1546
 f2fs_fallocate+0x470/0x750 fs/f2fs/file.c:1870
 vfs_fallocate+0x4b9/0x590 fs/open.c:310
 ksys_fallocate fs/open.c:333 [inline]
 __do_sys_fallocate fs/open.c:341 [inline]
 __se_sys_fallocate fs/open.c:339 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:339
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f1ceccb1559
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:00007f1ceb664028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f1cecf38450 RCX: 00007f1ceccb1559
RDX: 0000000000000006 RSI: 0000000000000010 RDI: 0000000000000004
RBP: 00007f1cecd48b50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000007000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1cecf384e8 R14: 00007f1cecf38450 R15: 00007ffdb3a8fd58
Modules linked in:
---[ end trace a8cd77e18b6e971e ]---
RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2914 [inline]
RIP: 0010:update_sit_entry+0x5a4/0xfd0 fs/f2fs/segment.c:2339
Code: 80 3c 08 00 74 08 48 89 df e8 c8 19 92 ff 4c 89 75 b0 48 8b 1b 48 03 5d a8 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 0b 09 00 00 44 0f b6 33 44 89 f0 44 08 e8
RSP: 0018:ffffc90002586db8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: ffff888118cf8000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002586e30 R08: ffff888119d76029 R09: 1ffff110233aec05
R10: dffffc0000000000 R11: ffffed10233aec06 R12: ffff88812586a000
R13: 0000000000000004 R14: ffff88812586a0c0 R15: ffff8881231b9878
FS:  00007f1ceb6646c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1ce3427ffb CR3: 00000001160bc000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1)
   4:	74 08                	je     0xe
   6:	48 89 df             	mov    %rbx,%rdi
   9:	e8 c8 19 92 ff       	call   0xff9219d6
   e:	4c 89 75 b0          	mov    %r14,-0x50(%rbp)
  12:	48 8b 1b             	mov    (%rbx),%rbx
  15:	48 03 5d a8          	add    -0x58(%rbp),%rbx
  19:	48 89 d8             	mov    %rbx,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 0b 09 00 00    	jne    0x941
  36:	44 0f b6 33          	movzbl (%rbx),%r14d
  3a:	44 89 f0             	mov    %r14d,%eax
  3d:	44 08 e8             	or     %r13b,%al