kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 2600 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
RIP: 0010:__list_del_entry_valid+0x81/0xf0 lib/list_debug.c:51
Code: 0f 84 30 52 85 04 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 31 52 85 04 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 51 49 8b 14 24 48 39 ea 0f 85 e8 51 85 04 49 8d 7d
RSP: 0018:ffff8880465a74e8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8880983c8900 RCX: ffffffff814bdebb
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880983c8c28
RBP: ffff8880983c8c20 R08: 0000000000000001 R09: fffffbfff15cead8
R10: ffffffff8ae756c3 R11: 0000000005058419 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8880983c8b80 R15: ffff8880983c8c28
FS:  00007f077bd97700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ce2a000 CR3: 00000000b47c4000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del include/linux/list.h:125 [inline]
 cbs_destroy+0x81/0x280 net/sched/sch_cbs.c:448
 qdisc_create+0xb70/0x1130 net/sched/sch_api.c:1204
 tc_modify_qdisc+0xb0f/0x1a80 net/sched/sch_api.c:1555
 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4782
 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2463
 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline]
 netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351
 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xc3/0x120 net/socket.c:661
 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227
 __sys_sendmsg net/socket.c:2265 [inline]
 __do_sys_sendmsg net/socket.c:2274 [inline]
 __se_sys_sendmsg net/socket.c:2272 [inline]
 __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f077d8250c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
RSP: 002b:00007f077bd97168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f077d944f80 RCX: 00007f077d8250c9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000006
RBP: 00007f077d880ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff977c5f0f R14: 00007f077bd97300 R15: 0000000000022000
Modules linked in:
---[ end trace 6fda3b2f61b194c9 ]---
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
RIP: 0010:__list_del_entry_valid+0x81/0xf0 lib/list_debug.c:51
Code: 0f 84 30 52 85 04 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 31 52 85 04 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 51 49 8b 14 24 48 39 ea 0f 85 e8 51 85 04 49 8d 7d
RSP: 0018:ffff8880465a74e8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8880983c8900 RCX: ffffffff814bdebb
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880983c8c28
RBP: ffff8880983c8c20 R08: 0000000000000001 R09: fffffbfff15cead8
R10: ffffffff8ae756c3 R11: 0000000005058419 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8880983c8b80 R15: ffff8880983c8c28
FS:  00007f077bd97700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ce2a000 CR3: 00000000b47c4000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	0f 84 30 52 85 04    	je     0x4855236
   6:	48 b8 00 02 00 00 00 	movabs $0xdead000000000200,%rax
   d:	00 ad de
  10:	49 39 c4             	cmp    %rax,%r12
  13:	0f 84 31 52 85 04    	je     0x485524a
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	4c 89 e2             	mov    %r12,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	75 51                	jne    0x81
  30:	49 8b 14 24          	mov    (%r12),%rdx
  34:	48 39 ea             	cmp    %rbp,%rdx
  37:	0f 85 e8 51 85 04    	jne    0x4855225
  3d:	49                   	rex.WB
  3e:	8d                   	.byte 0x8d
  3f:	7d                   	.byte 0x7d