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: 1 PID: 5227 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:dequeue_head net/sched/sch_fq_codel.c:126 [inline]
RIP: 0010:fq_codel_drop net/sched/sch_fq_codel.c:174 [inline]
RIP: 0010:fq_codel_enqueue+0x8ad/0x1100 net/sched/sch_fq_codel.c:236
Code: 59 8e ca fa 45 39 ec 0f 83 cb 00 00 00 e8 5b 8d ca fa 48 8b 44 24 10 80 38 00 0f 85 69 06 00 00 49 8b 07 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 3d 06 00 00 48 8b 10 48 8d 78 28 49 89 17 48
RSP: 0018:ffff88809f8376d0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8697f775
RDX: 0000000000000000 RSI: ffffffff8697f815 RDI: 0000000000000004
RBP: ffff88809f837890 R08: ffffffff8c665058 R09: 0000000000000400
R10: 0000000000000004 R11: ffffffff8c66505b R12: 0000000000000400
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880362ecb00
FS:  00007f88377ec700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f88377ebd38 CR3: 00000000ab30b000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __dev_xmit_skb net/core/dev.c:3494 [inline]
 __dev_queue_xmit+0x140a/0x2e00 net/core/dev.c:3807
 __netlink_deliver_tap_skb net/netlink/af_netlink.c:303 [inline]
 __netlink_deliver_tap net/netlink/af_netlink.c:321 [inline]
 netlink_deliver_tap+0x8fb/0xb00 net/netlink/af_netlink.c:334
 netlink_deliver_tap_kernel net/netlink/af_netlink.c:343 [inline]
 netlink_unicast_kernel net/netlink/af_netlink.c:1324 [inline]
 netlink_unicast+0x545/0x690 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: 0033:0x7f8838e77049
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f88377ec168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8838f89f60 RCX: 00007f8838e77049
RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000006
RBP: 00007f8838ed108d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc40e9282f R14: 00007f88377ec300 R15: 0000000000022000
Modules linked in:
---[ end trace b737ae71b52d98f3 ]---
RIP: 0010:dequeue_head net/sched/sch_fq_codel.c:126 [inline]
RIP: 0010:fq_codel_drop net/sched/sch_fq_codel.c:174 [inline]
RIP: 0010:fq_codel_enqueue+0x8ad/0x1100 net/sched/sch_fq_codel.c:236
Code: 59 8e ca fa 45 39 ec 0f 83 cb 00 00 00 e8 5b 8d ca fa 48 8b 44 24 10 80 38 00 0f 85 69 06 00 00 49 8b 07 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 3d 06 00 00 48 8b 10 48 8d 78 28 49 89 17 48
RSP: 0018:ffff88809f8376d0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8697f775
RDX: 0000000000000000 RSI: ffffffff8697f815 RDI: 0000000000000004
RBP: ffff88809f837890 R08: ffffffff8c665058 R09: 0000000000000400
R10: 0000000000000004 R11: ffffffff8c66505b R12: 0000000000000400
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880362ecb00
FS:  00007f88377ec700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f88377ebd38 CR3: 00000000ab30b000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	59                   	pop    %rcx
   1:	8e ca                	mov    %edx,%cs
   3:	fa                   	cli
   4:	45 39 ec             	cmp    %r13d,%r12d
   7:	0f 83 cb 00 00 00    	jae    0xd8
   d:	e8 5b 8d ca fa       	callq  0xfaca8d6d
  12:	48 8b 44 24 10       	mov    0x10(%rsp),%rax
  17:	80 38 00             	cmpb   $0x0,(%rax)
  1a:	0f 85 69 06 00 00    	jne    0x689
  20:	49 8b 07             	mov    (%r15),%rax
  23:	48 89 c2             	mov    %rax,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	42 80 3c 32 00       	cmpb   $0x0,(%rdx,%r14,1) <-- trapping instruction
  2f:	0f 85 3d 06 00 00    	jne    0x672
  35:	48 8b 10             	mov    (%rax),%rdx
  38:	48 8d 78 28          	lea    0x28(%rax),%rdi
  3c:	49 89 17             	mov    %rdx,(%r15)
  3f:	48                   	rex.W