syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 411 Comm: syz.3.20 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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 15 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: 0000:ffffc90000f06690 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8881109562c0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000f06710 R08: ffff8881109562c0 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888112b44078 R14: ffff88811226a0c0 R15: ffff88811226a000
FS:  0000555580ce2500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00001ffffffffe00 CR3: 0000000112b88000 CR4: 00000000003506a0
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_convert_inline_page+0x7eb/0xeb0 fs/f2fs/inline.c:197
 f2fs_convert_inline_inode+0x63d/0x700 fs/f2fs/inline.c:247
 f2fs_preallocate_blocks fs/f2fs/file.c:4664 [inline]
 f2fs_file_write_iter+0xe1f/0x27a0 fs/f2fs/file.c:4906
 __kernel_write+0x535/0x910 fs/read_write.c:550
 dump_emit+0x246/0x370 fs/coredump.c:855
 writenote+0x1bd/0x2f0 fs/binfmt_elf.c:1465
 write_note_info+0x1f9/0x320 fs/binfmt_elf.c:1930
 elf_core_dump+0x2788/0x2cc0 fs/binfmt_elf.c:2277
 do_coredump+0x1ba3/0x28e0 fs/coredump.c:817
 get_signal+0xf23/0x12e0 kernel/signal.c:2779
 arch_do_signal_or_restart+0xe2/0x11d0 arch/x86/kernel/signal.c:805
 handle_signal_work kernel/entry/common.c:145 [inline]
 exit_to_user_mode_loop+0xa2/0xe0 kernel/entry/common.c:169
 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199
 irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:287
 irqentry_exit+0x12/0x60 kernel/entry/common.c:375
 exc_page_fault+0x67/0xc0 arch/x86/mm/fault.c:1495
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571
RIP: 0033:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 002b:00002000000001c8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007efd1c9ebfa0 RCX: 00007efd1c772e59
RDX: 0000200000000200 RSI: 00002000000001c0 RDI: 0000000000001000
RBP: 00007efd1c808d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007efd1c9ebfac R14: 00007efd1c9ebfa0 R15: 00007efd1c9ebfa0
Modules linked in:
---[ end trace ad0697c1dc08d5ee ]---
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 15 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: 0000:ffffc90000f06690 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8881109562c0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000f06710 R08: ffff8881109562c0 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888112b44078 R14: ffff88811226a0c0 R15: ffff88811226a000
FS:  0000555580ce2500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00001ffffffffe00 CR3: 0000000112b88000 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 15 92 ff       	call   0xff9215ec
  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