general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 3721 Comm: syz-executor.0 Not tainted 6.0.0-rc4-syzkaller-00451-g0066f1b0e275 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
RIP: 0010:__skb_unlink include/linux/skbuff.h:2313 [inline]
RIP: 0010:skb_unlink+0xb8/0x150 net/core/skbuff.c:3417
Code: 00 49 8d 7c 24 08 48 8b 6b 08 48 b8 00 00 00 00 00 fc ff df 48 c7 43 08 00 00 00 00 48 89 fa 48 c7 03 00 00 00 00 48 c1 ea 03 <80> 3c 02 00 75 56 48 89 ea 49 89 6c 24 08 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc900049af918 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: ffff88807d5aea00 RCX: ffffffff815ff4b0
RDX: 0000000000000001 RSI: 0000000000000293 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003
R10: fffff52000935f11 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88807d892a50 R14: ffffc900049afdf4 R15: 1ffff92000935f2e
FS:  00007f78c5313700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020005030 CR3: 000000007a79b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kcm_recvmsg+0x409/0x500 net/kcm/kcmsock.c:1160
 sock_recvmsg_nosec net/socket.c:995 [inline]
 ____sys_recvmsg+0x536/0x600 net/socket.c:2699
 ___sys_recvmsg+0xf2/0x180 net/socket.c:2743
 do_recvmmsg+0x25e/0x6e0 net/socket.c:2837
 __sys_recvmmsg net/socket.c:2916 [inline]
 __do_sys_recvmmsg net/socket.c:2939 [inline]
 __se_sys_recvmmsg net/socket.c:2932 [inline]
 __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2932
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x461fc9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f78c53131a8 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 0000000000461fc9
RDX: 0400000000000310 RSI: 0000000020003540 RDI: 0000000000000005
RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004f7980 R14: 00000000004b412d R15: 00007f78c53136bc
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__skb_unlink include/linux/skbuff.h:2313 [inline]
RIP: 0010:skb_unlink+0xb8/0x150 net/core/skbuff.c:3417
Code: 00 49 8d 7c 24 08 48 8b 6b 08 48 b8 00 00 00 00 00 fc ff df 48 c7 43 08 00 00 00 00 48 89 fa 48 c7 03 00 00 00 00 48 c1 ea 03 <80> 3c 02 00 75 56 48 89 ea 49 89 6c 24 08 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc900049af918 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: ffff88807d5aea00 RCX: ffffffff815ff4b0
RDX: 0000000000000001 RSI: 0000000000000293 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003
R10: fffff52000935f11 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88807d892a50 R14: ffffc900049afdf4 R15: 1ffff92000935f2e
FS:  00007f78c5313700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020005030 CR3: 000000007a79b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	49 8d 7c 24 08       	lea    0x8(%r12),%rdi
   5:	48 8b 6b 08          	mov    0x8(%rbx),%rbp
   9:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  10:	fc ff df
  13:	48 c7 43 08 00 00 00 	movq   $0x0,0x8(%rbx)
  1a:	00
  1b:	48 89 fa             	mov    %rdi,%rdx
  1e:	48 c7 03 00 00 00 00 	movq   $0x0,(%rbx)
  25:	48 c1 ea 03          	shr    $0x3,%rdx
* 29:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2d:	75 56                	jne    0x85
  2f:	48 89 ea             	mov    %rbp,%rdx
  32:	49 89 6c 24 08       	mov    %rbp,0x8(%r12)
  37:	48                   	rex.W
  38:	b8 00 00 00 00       	mov    $0x0,%eax
  3d:	00 fc                	add    %bh,%ah