Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 UID: 0 PID: 7478 Comm: syz.4.431 Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:qdisc_pkt_len include/net/sch_generic.h:821 [inline]
RIP: 0010:codel_change+0x4b5/0xb40 net/sched/sch_codel.c:149
Code: e0 07 83 c0 03 88 44 24 33 e9 e2 00 00 00 e8 e2 ff 3e f8 49 c7 07 00 00 00 00 e8 d6 ff 3e f8 49 8d 7f 28 48 89 fa 48 c1 ea 03 <0f> b6 0c 2a 48 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 7b
RSP: 0018:ffffc9001c9ff3e8 EFLAGS: 00010206
RAX: 0000000000006879 RBX: ffff888059fa6000 RCX: ffffc9000cd0c000
RDX: 0000000000000005 RSI: ffffffff897c312a RDI: 0000000000000028
RBP: dffffc0000000000 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 00000000000005b0 R14: ffff888059fa6014 R15: 0000000000000000
FS:  00007fbae5c526c0(0000) GS:ffff8881249e4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c33c523 CR3: 0000000058ff7000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 qdisc_change net/sched/sch_api.c:1394 [inline]
 __tc_modify_qdisc net/sched/sch_api.c:1727 [inline]
 tc_modify_qdisc+0x74b/0x2100 net/sched/sch_api.c:1821
 rtnetlink_rcv_msg+0x3c6/0xe90 net/core/rtnetlink.c:6964
 netlink_rcv_skb+0x16a/0x440 net/netlink/af_netlink.c:2534
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg net/socket.c:727 [inline]
 ____sys_sendmsg+0xa95/0xc70 net/socket.c:2566
 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
 __sys_sendmsg+0x16d/0x220 net/socket.c:2652
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbae4d8e969
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:00007fbae5c52038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbae4fb5fa0 RCX: 00007fbae4d8e969
RDX: 0000000000004000 RSI: 0000200000000280 RDI: 0000000000000004
RBP: 00007fbae4e10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fbae4fb5fa0 R15: 00007ffea30a4bc8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:qdisc_pkt_len include/net/sch_generic.h:821 [inline]
RIP: 0010:codel_change+0x4b5/0xb40 net/sched/sch_codel.c:149
Code: e0 07 83 c0 03 88 44 24 33 e9 e2 00 00 00 e8 e2 ff 3e f8 49 c7 07 00 00 00 00 e8 d6 ff 3e f8 49 8d 7f 28 48 89 fa 48 c1 ea 03 <0f> b6 0c 2a 48 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 7b
RSP: 0018:ffffc9001c9ff3e8 EFLAGS: 00010206
RAX: 0000000000006879 RBX: ffff888059fa6000 RCX: ffffc9000cd0c000
RDX: 0000000000000005 RSI: ffffffff897c312a RDI: 0000000000000028
RBP: dffffc0000000000 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 00000000000005b0 R14: ffff888059fa6014 R15: 0000000000000000
FS:  00007fbae5c526c0(0000) GS:ffff8881249e4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c33c523 CR3: 0000000058ff7000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e0 07                	loopne 0x9
   2:	83 c0 03             	add    $0x3,%eax
   5:	88 44 24 33          	mov    %al,0x33(%rsp)
   9:	e9 e2 00 00 00       	jmp    0xf0
   e:	e8 e2 ff 3e f8       	call   0xf83efff5
  13:	49 c7 07 00 00 00 00 	movq   $0x0,(%r15)
  1a:	e8 d6 ff 3e f8       	call   0xf83efff5
  1f:	49 8d 7f 28          	lea    0x28(%r15),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 0c 2a          	movzbl (%rdx,%rbp,1),%ecx <-- trapping instruction
  2e:	48 89 fa             	mov    %rdi,%rdx
  31:	83 e2 07             	and    $0x7,%edx
  34:	83 c2 03             	add    $0x3,%edx
  37:	38 ca                	cmp    %cl,%dl
  39:	7c 08                	jl     0x43
  3b:	84 c9                	test   %cl,%cl
  3d:	0f                   	.byte 0xf
  3e:	85                   	.byte 0x85
  3f:	7b                   	.byte 0x7b