Oops: general protection fault, probably for non-canonical address 0xdffffc000000005d: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000002e8-0x00000000000002ef]
CPU: 1 UID: 0 PID: 30590 Comm: syz.2.25622 Not tainted 6.16.0-rc5-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:hfsc_qlen_notify+0x2e/0x160 net/sched/sch_hfsc.c:1238
Code: 55 41 57 41 56 41 55 41 54 53 48 89 f3 49 bc 00 00 00 00 00 fc ff df e8 e0 74 3d f8 4c 8d b3 ec 02 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 e8 00 00 00 41 8b 2e 31 ff 89 ee e8 f9
RSP: 0018:ffffc90003116fb0 EFLAGS: 00010203
RAX: 000000000000005d RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000d625000 RSI: 0000000000000adf RDI: 0000000000000ae0
RBP: dffffc0000000000 R08: ffff888027838000 R09: 0000000000000002
R10: 00000000ffffffff R11: ffffffff8982b100 R12: dffffc0000000000
R13: ffff888148328000 R14: 00000000000002ec R15: ffff888148328000
FS:  0000000000000000(0000) GS:ffff888125d1d000(0063) knlGS:00000000f5046b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000002ff1cff8 CR3: 00000000729e6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 qdisc_tree_reduce_backlog+0x29c/0x480 net/sched/sch_api.c:811
 fq_change+0x1519/0x1f50 net/sched/sch_fq.c:1147
 fq_init+0x699/0x960 net/sched/sch_fq.c:1201
 qdisc_create+0x7ac/0xea0 net/sched/sch_api.c:1324
 __tc_modify_qdisc net/sched/sch_api.c:1749 [inline]
 tc_modify_qdisc+0x1426/0x2010 net/sched/sch_api.c:1813
 rtnetlink_rcv_msg+0x779/0xb70 net/core/rtnetlink.c:6953
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2534
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x75b/0x8d0 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:727
 ____sys_sendmsg+0x505/0x830 net/socket.c:2566
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620
 __sys_sendmsg+0x164/0x220 net/socket.c:2652
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xb6/0x2b0 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f22539
Code: 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f504655c EFLAGS: 00000206 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000080000280
RDX: 0000000000004000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfsc_qlen_notify+0x2e/0x160 net/sched/sch_hfsc.c:1238
Code: 55 41 57 41 56 41 55 41 54 53 48 89 f3 49 bc 00 00 00 00 00 fc ff df e8 e0 74 3d f8 4c 8d b3 ec 02 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 e8 00 00 00 41 8b 2e 31 ff 89 ee e8 f9
RSP: 0018:ffffc90003116fb0 EFLAGS: 00010203
RAX: 000000000000005d RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000d625000 RSI: 0000000000000adf RDI: 0000000000000ae0
RBP: dffffc0000000000 R08: ffff888027838000 R09: 0000000000000002
R10: 00000000ffffffff R11: ffffffff8982b100 R12: dffffc0000000000
R13: ffff888148328000 R14: 00000000000002ec R15: ffff888148328000
FS:  0000000000000000(0000) GS:ffff888125d1d000(0063) knlGS:00000000f5046b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000002ff1cff8 CR3: 00000000729e6000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	55                   	push   %rbp
   1:	41 57                	push   %r15
   3:	41 56                	push   %r14
   5:	41 55                	push   %r13
   7:	41 54                	push   %r12
   9:	53                   	push   %rbx
   a:	48 89 f3             	mov    %rsi,%rbx
   d:	49 bc 00 00 00 00 00 	movabs $0xdffffc0000000000,%r12
  14:	fc ff df
  17:	e8 e0 74 3d f8       	call   0xf83d74fc
  1c:	4c 8d b3 ec 02 00 00 	lea    0x2ec(%rbx),%r14
  23:	4c 89 f0             	mov    %r14,%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 e8 00 00 00    	jne    0x11f
  37:	41 8b 2e             	mov    (%r14),%ebp
  3a:	31 ff                	xor    %edi,%edi
  3c:	89 ee                	mov    %ebp,%esi
  3e:	e8                   	.byte 0xe8
  3f:	f9                   	stc