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: 2090 Comm: syz.9.466 Not tainted 6.1.138-syzkaller-00013-gf6c21bc9a693 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2941 [inline]
RIP: 0010:update_sit_entry_for_alloc fs/f2fs/segment.c:2396 [inline]
RIP: 0010:update_sit_entry+0x4f9/0x15a0 fs/f2fs/segment.c:2440
Code: 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 ee 11 8d ff 48 8b 1b 4c 01 f3 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 55 0f 00 00 44 0f b6 23 44 89 e0 44 08 f8
RSP: 0000:ffffc90008c6e780 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: ffff888107418000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90008c6e850 R08: ffff888107418000 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000000
R13: ffff88812213c0c8 R14: 0000000000000000 R15: 0000000000000004
FS:  00007f87e91896c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00001ffffffffe40 CR3: 0000000121f2e000 CR4: 00000000003526b0
DR0: 0000000000000008 DR1: 0000000000000008 DR2: 0000000000000006
DR3: 0000000000000004 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 f2fs_allocate_data_block+0x148c/0x3af0 fs/f2fs/segment.c:3430
 do_write_page+0x297/0xc40 fs/f2fs/segment.c:3532
 f2fs_outplace_write_data+0x14f/0x2d0 fs/f2fs/segment.c:3605
 f2fs_convert_inline_page+0x6ff/0xe90 fs/f2fs/inline.c:179
 f2fs_convert_inline_inode+0x873/0x960 fs/f2fs/inline.c:231
 f2fs_preallocate_blocks fs/f2fs/file.c:4683 [inline]
 f2fs_file_write_iter+0x112c/0x2550 fs/f2fs/file.c:4923
 __kernel_write_iter+0x27e/0x640 fs/read_write.c:517
 __kernel_write+0xec/0x140 fs/read_write.c:537
 __dump_emit+0x1ff/0x300 fs/coredump.c:804
 dump_emit+0xa8/0xc0 fs/coredump.c:841
 writenote+0x1bb/0x2e0 fs/binfmt_elf.c:1489
 write_note_info fs/binfmt_elf.c:1952 [inline]
 elf_core_dump+0x25fe/0x2ef0 fs/binfmt_elf.c:2300
 do_coredump+0x1557/0x21b0 fs/coredump.c:755
 get_signal+0x11db/0x1520 kernel/signal.c:2875
 arch_do_signal_or_restart+0xb0/0x1030 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:210
 irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:316
 irqentry_exit+0x12/0x40 kernel/entry/common.c:419
 exc_page_fault+0x5e/0xb0 arch/x86/mm/fault.c:1525
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 002b:0000200000000228 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f87e85b6160 RCX: 00007f87e838e929
RDX: 0000200000000300 RSI: 0000200000000220 RDI: 0000000000840080
RBP: 00007f87e8410b39 R08: 0000200000000380 R09: 0000200000000380
R10: 0000200000000340 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f87e85b6160 R15: 00007ffd75de9bb8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2941 [inline]
RIP: 0010:update_sit_entry_for_alloc fs/f2fs/segment.c:2396 [inline]
RIP: 0010:update_sit_entry+0x4f9/0x15a0 fs/f2fs/segment.c:2440
Code: 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 ee 11 8d ff 48 8b 1b 4c 01 f3 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 55 0f 00 00 44 0f b6 23 44 89 e0 44 08 f8
RSP: 0000:ffffc90008c6e780 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: ffff888107418000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90008c6e850 R08: ffff888107418000 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000000
R13: ffff88812213c0c8 R14: 0000000000000000 R15: 0000000000000004
FS:  00007f87e91896c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa8ee3e1f8c CR3: 0000000121f2e000 CR4: 00000000003526b0
DR0: 0000000000000008 DR1: 0000000000000008 DR2: 0000000000000006
DR3: 0000000000000004 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 4 bytes skipped:
   0:	df 80 3c 08 00 74    	filds  0x7400083c(%rax)
   6:	08 48 89             	or     %cl,-0x77(%rax)
   9:	df e8                	fucomip %st(0),%st
   b:	ee                   	out    %al,(%dx)
   c:	11 8d ff 48 8b 1b    	adc    %ecx,0x1b8b48ff(%rbp)
  12:	4c 01 f3             	add    %r14,%rbx
  15:	48 89 d8             	mov    %rbx,%rax
  18:	48 c1 e8 03          	shr    $0x3,%rax
  1c:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  23:	fc ff df
* 26:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2a:	84 c0                	test   %al,%al
  2c:	0f 85 55 0f 00 00    	jne    0xf87
  32:	44 0f b6 23          	movzbl (%rbx),%r12d
  36:	44 89 e0             	mov    %r12d,%eax
  39:	44 08 f8             	or     %r15b,%al