kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 341 Comm: syz-executor242 Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:cgroup_ancestor include/linux/cgroup.h:591 [inline]
RIP: 0010:____bpf_skb_ancestor_cgroup_id net/core/filter.c:4171 [inline]
RIP: 0010:bpf_skb_ancestor_cgroup_id+0x11d/0x280 net/core/filter.c:4160
Code: 02 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 94 42 26 fe 4d 8b 36 49 8d be 1c 01 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 3b 01 00 00 45 8b be 1c 01 00 00 44 89
RSP: 0018:ffff8881d9af7978 EFLAGS: 00010203
RAX: 0000000000000023 RBX: fffffffffffffe00 RCX: 0000000000000000
RDX: ffff8881def10fc0 RSI: 0000000000000080 RDI: 000000000000011c
RBP: ffff8881d9af7998 R08: 0000000000000040 R09: ffffed103e04cd21
R10: ffffed103e04cd21 R11: 1ffff1103e04cd1e R12: dffffc0000000000
R13: ffffc90000036020 R14: 0000000000000000 R15: 0000000000000080
FS:  00005555647bf380(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564227aa0000 CR3: 00000001de73a000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
Modules linked in:
---[ end trace 4b6632d6bae19f05 ]---
RIP: 0010:cgroup_ancestor include/linux/cgroup.h:591 [inline]
RIP: 0010:____bpf_skb_ancestor_cgroup_id net/core/filter.c:4171 [inline]
RIP: 0010:bpf_skb_ancestor_cgroup_id+0x11d/0x280 net/core/filter.c:4160
Code: 02 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 94 42 26 fe 4d 8b 36 49 8d be 1c 01 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 3b 01 00 00 45 8b be 1c 01 00 00 44 89
RSP: 0018:ffff8881d9af7978 EFLAGS: 00010203
RAX: 0000000000000023 RBX: fffffffffffffe00 RCX: 0000000000000000
RDX: ffff8881def10fc0 RSI: 0000000000000080 RDI: 000000000000011c
RBP: ffff8881d9af7998 R08: 0000000000000040 R09: ffffed103e04cd21
R10: ffffed103e04cd21 R11: 1ffff1103e04cd1e R12: dffffc0000000000
R13: ffffc90000036020 R14: 0000000000000000 R15: 0000000000000080
FS:  00005555647bf380(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564227aa0000 CR3: 00000001de73a000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	02 00                	add    (%rax),%al
   2:	00 4c 89 f0          	add    %cl,-0x10(%rcx,%rcx,4)
   6:	48 c1 e8 03          	shr    $0x3,%rax
   a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
   f:	74 08                	je     0x19
  11:	4c 89 f7             	mov    %r14,%rdi
  14:	e8 94 42 26 fe       	call   0xfe2642ad
  19:	4d 8b 36             	mov    (%r14),%r14
  1c:	49 8d be 1c 01 00 00 	lea    0x11c(%r14),%rdi
  23:	48 89 f8             	mov    %rdi,%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 3b 01 00 00    	jne    0x172
  37:	45 8b be 1c 01 00 00 	mov    0x11c(%r14),%r15d
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89