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: 20863 Comm: syz.7.5470 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:f2fs_test_and_clear_bit fs/f2fs/f2fs.h:2927 [inline]
RIP: 0010:update_sit_entry+0x5f7/0xf50 fs/f2fs/segment.c:2382
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 57 df 93 ff 48 8b 1b 48 03 5d a8 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 5c 08 00 00 44 0f b6 33 0f b6 45 bf 44
RSP: 0018:ffffc90000d578e8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
RDX: ffff88812f958000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000d57968 R08: dffffc0000000000 R09: ffffed1022e47010
R10: ffffed1022e47010 R11: 1ffff11022e4700f R12: dffffc0000000000
R13: ffff888121d02878 R14: ffff8881172380c0 R15: ffff888117238000
FS:  00007f91e02706c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000143fd1000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 f2fs_invalidate_blocks+0x267/0x360 fs/f2fs/segment.c:2413
 f2fs_truncate_data_blocks_range+0x7b4/0xec0 fs/f2fs/file.c:667
 f2fs_do_truncate_blocks+0x59f/0x9a0 fs/f2fs/file.c:779
 f2fs_truncate_blocks+0x115/0x310 fs/f2fs/file.c:813
 f2fs_truncate+0x1d7/0x3d0 fs/f2fs/file.c:865
 f2fs_setattr+0x981/0x1010 fs/f2fs/file.c:1036
 notify_change+0xab3/0xe40 fs/attr.c:410
 do_truncate+0x186/0x210 fs/open.c:65
 do_sys_ftruncate+0x495/0x6b0 fs/open.c:196
 __do_sys_ftruncate fs/open.c:206 [inline]
 __se_sys_ftruncate fs/open.c:204 [inline]
 __x64_sys_ftruncate+0x60/0x70 fs/open.c:204
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f91e1829749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f91e0270038 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007f91e1a80090 RCX: 00007f91e1829749
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000005
RBP: 00007f91e18adf91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f91e1a80128 R14: 00007f91e1a80090 R15: 00007ffc8c8e4538
Modules linked in:
---[ end trace 76b9f79820354846 ]---
RIP: 0010:f2fs_test_and_clear_bit fs/f2fs/f2fs.h:2927 [inline]
RIP: 0010:update_sit_entry+0x5f7/0xf50 fs/f2fs/segment.c:2382
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 57 df 93 ff 48 8b 1b 48 03 5d a8 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 5c 08 00 00 44 0f b6 33 0f b6 45 bf 44
RSP: 0018:ffffc90000d578e8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
RDX: ffff88812f958000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000d57968 R08: dffffc0000000000 R09: ffffed1022e47010
R10: ffffed1022e47010 R11: 1ffff11022e4700f R12: dffffc0000000000
R13: ffff888121d02878 R14: ffff8881172380c0 R15: ffff888117238000
FS:  00007f91e02706c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2b51ecdf98 CR3: 0000000143fd1000 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 57 df 93 ff       	call   0xff93df73
  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 5c 08 00 00    	jne    0x893
  37:	44 0f b6 33          	movzbl (%rbx),%r14d
  3b:	0f b6 45 bf          	movzbl -0x41(%rbp),%eax
  3f:	44                   	rex.R