syzbot

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: 377 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2946 [inline]
RIP: 0010:update_sit_entry+0x5a1/0xf40 fs/f2fs/segment.c:2256
Code: 8b 45 c8 48 8d 58 18 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 ac 81 90 ff 48 8b 1b 4c 01 f3 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 86 08 00 00 44 0f b6 33 44 89 f0 44 8b
RSP: 0018:ffffc90000b069e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888111cd0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000b06a60 R08: ffff8881118be029 R09: 1ffff11022317c05
R10: dffffc0000000000 R11: ffffed1022317c06 R12: 1ffff11022317030
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881113de000
FS:  0000555587bf8500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00001ffffffffe00 CR3: 000000012c1aa000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 f2fs_allocate_data_block+0x13b0/0x3140 fs/f2fs/segment.c:3457
 do_write_page+0x12e/0x9f0 fs/f2fs/segment.c:3547
 f2fs_outplace_write_data+0xf6/0x240 fs/f2fs/segment.c:3621
 f2fs_convert_inline_page+0x7eb/0xfc0 fs/f2fs/inline.c:198
 f2fs_convert_inline_inode+0x554/0x610 fs/f2fs/inline.c:250
 f2fs_preallocate_blocks fs/f2fs/file.c:4536 [inline]
 f2fs_file_write_iter+0x933/0x29f0 fs/f2fs/file.c:4777
 __kernel_write+0x521/0x970 fs/read_write.c:539
 __dump_emit+0x255/0x380 fs/coredump.c:880
 dump_emit+0x36a/0x3d0 fs/coredump.c:917
 writenote+0x1bd/0x2f0 fs/binfmt_elf.c:1465
 write_note_info fs/binfmt_elf.c:1929 [inline]
 elf_core_dump+0x2926/0x2ff0 fs/binfmt_elf.c:2272
 do_coredump+0x13c2/0x27d0 fs/coredump.c:831
 get_signal+0x387/0x1430 kernel/signal.c:2893
 arch_do_signal_or_restart+0xe2/0x1100 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:1563
 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:00002000000001c8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f47f8b8ffa0 RCX: 00007f47f8916e59
RDX: 0000200000000200 RSI: 00002000000001c0 RDI: 0000000000001000
RBP: 00007f47f89ace6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f47f8b8ffac R14: 00007f47f8b8ffa0 R15: 00007f47f8b8ffa0
 </TASK>
Modules linked in:
---[ end trace 9cc21f3ca44d76c2 ]---
RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2946 [inline]
RIP: 0010:update_sit_entry+0x5a1/0xf40 fs/f2fs/segment.c:2256
Code: 8b 45 c8 48 8d 58 18 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 ac 81 90 ff 48 8b 1b 4c 01 f3 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 86 08 00 00 44 0f b6 33 44 89 f0 44 8b
RSP: 0018:ffffc90000b069e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888111cd0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000b06a60 R08: ffff8881118be029 R09: 1ffff11022317c05
R10: dffffc0000000000 R11: ffffed1022317c06 R12: 1ffff11022317030
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881113de000
FS:  0000555587bf8500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000003466540 CR3: 000000012c1aa000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	8b 45 c8             	mov    -0x38(%rbp),%eax
   3:	48 8d 58 18          	lea    0x18(%rax),%rbx
   7:	48 89 d8             	mov    %rbx,%rax
   a:	48 c1 e8 03          	shr    $0x3,%rax
   e:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  13:	74 08                	je     0x1d
  15:	48 89 df             	mov    %rbx,%rdi
  18:	e8 ac 81 90 ff       	call   0xff9081c9
  1d:	48 8b 1b             	mov    (%rbx),%rbx
  20:	4c 01 f3             	add    %r14,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 86 08 00 00    	jne    0x8bd
  37:	44 0f b6 33          	movzbl (%rbx),%r14d
  3b:	44 89 f0             	mov    %r14d,%eax
  3e:	44                   	rex.R
  3f:	8b                   	.byte 0x8b