general protection fault, probably for non-canonical address 0xdffffc000000001d: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000e8-0x00000000000000ef]
CPU: 0 PID: 8658 Comm: kworker/u4:6 Not tainted 6.5.0-rc3-syzkaller-00283-g12214540ad87 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Workqueue: netns cleanup_net
RIP: 0010:qfq_reset_qdisc+0x117/0x420 net/sched/sch_qfq.c:1459
Code: 46 31 f9 4c 8d 6b 50 4c 89 e8 48 c1 e8 03 80 3c 28 00 0f 85 1a 02 00 00 4c 8b 73 50 49 8d be e8 00 00 00 48 89 f8 48 c1 e8 03 <0f> b6 04 28 84 c0 74 08 3c 03 0f 8e 0f 02 00 00 45 8b be e8 00 00
RSP: 0018:ffffc90006f378b8 EFLAGS: 00010206
RAX: 000000000000001d RBX: ffff8880366bfa00 RCX: 0000000000000000
RDX: ffff888054288000 RSI: ffffffff88552a60 RDI: 00000000000000e9
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000000 R12: ffff88807a9682d0
R13: ffff8880366bfa50 R14: 0000000000000001 R15: ffffed100f52d05a
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000056d35f4c CR3: 000000000c776000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 qdisc_reset+0xd8/0x620 net/sched/sch_generic.c:1022
 __qdisc_destroy+0x91/0x450 net/sched/sch_generic.c:1060
 qdisc_put+0xd1/0xf0 net/sched/sch_generic.c:1090
 dev_shutdown+0x1ce/0x430 net/sched/sch_generic.c:1478
 unregister_netdevice_many_notify+0x5bd/0x19a0 net/core/dev.c:10840
 unregister_netdevice_many net/core/dev.c:10906 [inline]
 default_device_exit_batch+0x584/0x740 net/core/dev.c:11359
 ops_exit_list+0x125/0x170 net/core/net_namespace.c:175
 cleanup_net+0x505/0xb20 net/core/net_namespace.c:614
 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597
 worker_thread+0x687/0x1110 kernel/workqueue.c:2748
 kthread+0x33a/0x430 kernel/kthread.c:389
 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296
RIP: 0000:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:qfq_reset_qdisc+0x117/0x420 net/sched/sch_qfq.c:1459
Code: 46 31 f9 4c 8d 6b 50 4c 89 e8 48 c1 e8 03 80 3c 28 00 0f 85 1a 02 00 00 4c 8b 73 50 49 8d be e8 00 00 00 48 89 f8 48 c1 e8 03 <0f> b6 04 28 84 c0 74 08 3c 03 0f 8e 0f 02 00 00 45 8b be e8 00 00
RSP: 0018:ffffc90006f378b8 EFLAGS: 00010206
RAX: 000000000000001d RBX: ffff8880366bfa00 RCX: 0000000000000000
RDX: ffff888054288000 RSI: ffffffff88552a60 RDI: 00000000000000e9
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000000 R12: ffff88807a9682d0
R13: ffff8880366bfa50 R14: 0000000000000001 R15: ffffed100f52d05a
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdf4e74f5b0 CR3: 000000002cb0d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	46 31 f9             	rex.RX xor %r15d,%ecx
   3:	4c 8d 6b 50          	lea    0x50(%rbx),%r13
   7:	4c 89 e8             	mov    %r13,%rax
   a:	48 c1 e8 03          	shr    $0x3,%rax
   e:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
  12:	0f 85 1a 02 00 00    	jne    0x232
  18:	4c 8b 73 50          	mov    0x50(%rbx),%r14
  1c:	49 8d be e8 00 00 00 	lea    0xe8(%r14),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	0f b6 04 28          	movzbl (%rax,%rbp,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 08                	je     0x3a
  32:	3c 03                	cmp    $0x3,%al
  34:	0f 8e 0f 02 00 00    	jle    0x249
  3a:	45                   	rex.RB
  3b:	8b                   	.byte 0x8b
  3c:	be                   	.byte 0xbe
  3d:	e8                   	.byte 0xe8