BUG: unable to handle page fault for address: fffffffffffffc10
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD e949067 P4D e949067 PUD e94b067 PMD 0 
Oops: Oops: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 28389 Comm: syz.4.5954 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:strlen+0x39/0x70 lib/string.c:402
Code: ff ff ff 49 be 00 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 11 48 ff c3 49 8d 47 01 <42> 80 7c 3f 01 00 75 de eb 19 89 d9 80 e1 07 38 c1 7c e6 49 89 fc
RSP: 0018:ffffc90003346f38 EFLAGS: 00010286
RAX: 0000000000000000 RBX: fffffffffffffc11 RCX: 0000000000080000
RDX: ffffc900047e9000 RSI: 000000000000031f RDI: fffffffffffffc10
RBP: ffffc90003347068 R08: ffffffff90574837 R09: 1ffffffff20ae906
R10: dffffc0000000000 R11: fffffbfff20ae907 R12: ffff88801b0df700
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffffffffffffffff
FS:  00007ff6da28b6c0(0000) GS:ffff888124f55000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffc10 CR3: 0000000061280000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __fortify_strlen include/linux/fortify-string.h:218 [inline]
 trace_event_get_offsets_drv_net_setup_tc net/mac80211/trace.h:2548 [inline]
 do_trace_event_raw_event_drv_net_setup_tc net/mac80211/trace.h:2539 [inline]
 trace_event_raw_event_drv_net_setup_tc+0x110/0x560 net/mac80211/trace.h:2539
 __do_trace_drv_net_setup_tc net/mac80211/trace.h:2539 [inline]
 trace_drv_net_setup_tc net/mac80211/trace.h:2539 [inline]
 drv_net_setup_tc net/mac80211/driver-ops.h:1706 [inline]
 ieee80211_netdev_setup_tc+0x326/0x360 net/mac80211/iface.c:938
 tcf_block_offload_cmd+0x235/0x3b0 net/sched/cls_api.c:853
 tcf_block_offload_bind net/sched/cls_api.c:890 [inline]
 tcf_block_get_ext+0xfe0/0x17d0 net/sched/cls_api.c:1513
 tcf_block_get+0x67/0xa0 net/sched/cls_api.c:1558
 multiq_init+0x72/0x2b0 net/sched/sch_multiq.c:246
 qdisc_create+0x7b5/0xf00 net/sched/sch_api.c:1346
 __tc_modify_qdisc net/sched/sch_api.c:1780 [inline]
 tc_modify_qdisc+0x17af/0x2390 net/sched/sch_api.c:1844
 rtnetlink_rcv_msg+0x7b9/0xc00 net/core/rtnetlink.c:7085
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x7bb/0x940 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775
 __sock_sendmsg net/socket.c:790 [inline]
 ____sys_sendmsg+0x54e/0x850 net/socket.c:2684
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2738
 __sys_sendmsg net/socket.c:2770 [inline]
 __do_sys_sendmsg net/socket.c:2775 [inline]
 __se_sys_sendmsg net/socket.c:2773 [inline]
 __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2773
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff6d939e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff6da28b028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ff6d9625fa0 RCX: 00007ff6d939e0d9
RDX: 0000000000000000 RSI: 00002000000012c0 RDI: 0000000000000004
RBP: 00007ff6d9435024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff6d9626038 R14: 00007ff6d9625fa0 R15: 00007ffcaddfbed8
 </TASK>
Modules linked in:
CR2: fffffffffffffc10
---[ end trace 0000000000000000 ]---
RIP: 0010:strlen+0x39/0x70 lib/string.c:402
Code: ff ff ff 49 be 00 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 11 48 ff c3 49 8d 47 01 <42> 80 7c 3f 01 00 75 de eb 19 89 d9 80 e1 07 38 c1 7c e6 49 89 fc
RSP: 0018:ffffc90003346f38 EFLAGS: 00010286
RAX: 0000000000000000 RBX: fffffffffffffc11 RCX: 0000000000080000
RDX: ffffc900047e9000 RSI: 000000000000031f RDI: fffffffffffffc10
RBP: ffffc90003347068 R08: ffffffff90574837 R09: 1ffffffff20ae906
R10: dffffc0000000000 R11: fffffbfff20ae907 R12: ffff88801b0df700
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffffffffffffffff
FS:  00007ff6da28b6c0(0000) GS:ffff888124f55000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffc10 CR3: 0000000061280000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	ff 49 be             	decl   -0x42(%rcx)
   3:	00 00                	add    %al,(%rax)
   5:	00 00                	add    %al,(%rax)
   7:	00 fc                	add    %bh,%ah
   9:	ff                   	lcall  (bad)
   a:	df 48 89             	fisttps -0x77(%rax)
   d:	fb                   	sti
   e:	49 89 c7             	mov    %rax,%r15
  11:	48 89 d8             	mov    %rbx,%rax
  14:	48 c1 e8 03          	shr    $0x3,%rax
  18:	42 0f b6 04 30       	movzbl (%rax,%r14,1),%eax
  1d:	84 c0                	test   %al,%al
  1f:	75 11                	jne    0x32
  21:	48 ff c3             	inc    %rbx
  24:	49 8d 47 01          	lea    0x1(%r15),%rax
* 28:	42 80 7c 3f 01 00    	cmpb   $0x0,0x1(%rdi,%r15,1) <-- trapping instruction
  2e:	75 de                	jne    0xe
  30:	eb 19                	jmp    0x4b
  32:	89 d9                	mov    %ebx,%ecx
  34:	80 e1 07             	and    $0x7,%cl
  37:	38 c1                	cmp    %al,%cl
  39:	7c e6                	jl     0x21
  3b:	49 89 fc             	mov    %rdi,%r12