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: 4452 Comm: syz.1.1205 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2949 [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 ba 7a 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: 0000:ffffc90000a66918 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88811a790000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000a66998 R08: ffff88811a790000 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88810f1e7878 R14: 0000000000000000 R15: ffff888106bce000
FS:  00007f98b02876c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00001fffffffff00 CR3: 0000000112e7a000 CR4: 00000000003506b0
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
 do_write_page+0x13c/0xab0 fs/f2fs/segment.c:3547
 f2fs_outplace_write_data+0xf6/0x240 fs/f2fs/segment.c:3621
 f2fs_convert_inline_page+0x7e5/0xfc0 fs/f2fs/inline.c:198
 f2fs_convert_inline_inode+0x541/0x5f0 fs/f2fs/inline.c:250
 f2fs_preallocate_blocks fs/f2fs/file.c:4530 [inline]
 f2fs_file_write_iter+0x92a/0x29a0 fs/f2fs/file.c:4771
 __kernel_write+0x510/0x950 fs/read_write.c:539
 __dump_emit+0x246/0x370 fs/coredump.c:880
 dump_emit+0x383/0x3f0 fs/coredump.c:917
 writenote+0x1bd/0x2f0 fs/binfmt_elf.c:1465
 write_note_info fs/binfmt_elf.c:1929 [inline]
 elf_core_dump+0x291c/0x2fd0 fs/binfmt_elf.c:2272
 do_coredump+0x1452/0x2950 fs/coredump.c:831
 get_signal+0x38d/0x1480 kernel/signal.c:2893
 arch_do_signal_or_restart+0xdf/0x11c0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0xa7/0xe0 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:320
 irqentry_exit+0x12/0x40 kernel/entry/common.c:411
 exc_page_fault+0x5e/0xb0 arch/x86/mm/fault.c:1568
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 002b:00002000000002c8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f98b1aa5fa0 RCX: 00007f98b182aeb9
RDX: 0000200000000100 RSI: 00002000000002c0 RDI: 0000000080040000
RBP: 00007f98b1898c1f R08: 0000200000000700 R09: 0000200000000700
R10: 00002000000002c0 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f98b1aa6038 R14: 00007f98b1aa5fa0 R15: 00007ffeedf8f178
 </TASK>
Modules linked in:
---[ end trace 1b6f39169265e207 ]---
RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2949 [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 ba 7a 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: 0000:ffffc90000a66918 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88811a790000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000a66998 R08: ffff88811a790000 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88810f1e7878 R14: 0000000000000000 R15: ffff888106bce000
FS:  00007f98b02876c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d7d48f91f0 CR3: 0000000112e7a000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 00000000000f007a DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 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 ba 7a 90 ff       	call   0xff907ad6
  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