general protection fault, probably for non-canonical address 0xdffffc000000001d: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000000e8-0x00000000000000ef]
CPU: 0 PID: 2644 Comm: kworker/u4:6 Not tainted 6.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue: netns cleanup_net
RIP: 0010:qfq_reset_qdisc+0x101/0x240 net/sched/sch_qfq.c:1471
Code: 50 4d 89 fd 49 c1 ed 03 43 80 7c 35 00 00 74 08 4c 89 ff e8 f1 b7 85 f8 49 8b 2f b8 e8 00 00 00 48 01 c5 48 89 e8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 75 7a 8b 6d 00 31 ff 89 ee e8 aa 9e 23 f8 85
RSP: 0000:ffffc900140d76f0 EFLAGS: 00010206
RAX: 000000000000001d RBX: ffff88803fc90500 RCX: ffff88801e483b80
RDX: ffff88801e483b80 RSI: 0000000000000004 RDI: ffff88806f9e82d0
RBP: 00000000000000e9 R08: ffffffff896fd1c6 R09: 1ffffffff1f0acb5
R10: dffffc0000000000 R11: ffffffff896fd170 R12: ffff88806f9e82c0
R13: 1ffff11007f920aa R14: dffffc0000000000 R15: ffff88803fc90550
FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f74b1408 CR3: 000000002db38000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
qdisc_reset+0x103/0x580 net/sched/sch_generic.c:1024
__qdisc_destroy+0x120/0x3e0 net/sched/sch_generic.c:1063
qdisc_put net/sched/sch_generic.c:1094 [inline]
dev_shutdown+0x357/0x440 net/sched/sch_generic.c:1482
unregister_netdevice_many_notify+0x9a2/0x1740 net/core/dev.c:11073
unregister_netdevice_many net/core/dev.c:11139 [inline]
default_device_exit_batch+0x955/0x9d0 net/core/dev.c:11619
ops_exit_list net/core/net_namespace.c:175 [inline]
cleanup_net+0x775/0xb90 net/core/net_namespace.c:618
process_one_work kernel/workqueue.c:2633 [inline]
process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706
worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787
kthread+0x2ef/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:qfq_reset_qdisc+0x101/0x240 net/sched/sch_qfq.c:1471
Code: 50 4d 89 fd 49 c1 ed 03 43 80 7c 35 00 00 74 08 4c 89 ff e8 f1 b7 85 f8 49 8b 2f b8 e8 00 00 00 48 01 c5 48 89 e8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 75 7a 8b 6d 00 31 ff 89 ee e8 aa 9e 23 f8 85
RSP: 0000:ffffc900140d76f0 EFLAGS: 00010206
RAX: 000000000000001d RBX: ffff88803fc90500 RCX: ffff88801e483b80
RDX: ffff88801e483b80 RSI: 0000000000000004 RDI: ffff88806f9e82d0
RBP: 00000000000000e9 R08: ffffffff896fd1c6 R09: 1ffffffff1f0acb5
R10: dffffc0000000000 R11: ffffffff896fd170 R12: ffff88806f9e82c0
R13: 1ffff11007f920aa R14: dffffc0000000000 R15: ffff88803fc90550
FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f74b1408 CR3: 000000002e1a6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 50 push %rax
1: 4d 89 fd mov %r15,%r13
4: 49 c1 ed 03 shr $0x3,%r13
8: 43 80 7c 35 00 00 cmpb $0x0,0x0(%r13,%r14,1)
e: 74 08 je 0x18
10: 4c 89 ff mov %r15,%rdi
13: e8 f1 b7 85 f8 call 0xf885b809
18: 49 8b 2f mov (%r15),%rbp
1b: b8 e8 00 00 00 mov $0xe8,%eax
20: 48 01 c5 add %rax,%rbp
23: 48 89 e8 mov %rbp,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 75 7a jne 0xad
33: 8b 6d 00 mov 0x0(%rbp),%ebp
36: 31 ff xor %edi,%edi
38: 89 ee mov %ebp,%esi
3a: e8 aa 9e 23 f8 call 0xf8239ee9
3f: 85 .byte 0x85