[v6.6] BUG: unable to handle kernel paging request in trace_event_raw_event_drv_net_setup_tc

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: c5596480c50e Linux 6.6.145
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11da92a9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f0bc3d90c30838b5
dashboard link: https://syzkaller.appspot.com/bug?extid=5d2c1c147dcdeef3ae37
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/eb5cda0a8020/disk-c5596480.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ca05ff2fc502/vmlinux-c5596480.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6daf3255b985/bzImage-c5596480.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5d2c1c...@syzkaller.appspotmail.com

BUG: unable to handle page fault for address: fffffffffffffbc8
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD cf35067 P4D cf35067 PUD cf37067 PMD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 10492 Comm: syz.3.1157 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:strlen+0x39/0x70 lib/string.c:425
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:ffffc9000445ebf8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: fffffffffffffbc9 RCX: 0000000000080000
RDX: ffffc9000d72b000 RSI: 0000000000000d84 RDI: fffffffffffffbc8
RBP: ffffc9000445ed28 R08: ffffffff8e8c7caf R09: 1ffffffff1d18f95
R10: dffffc0000000000 R11: fffffbfff1d18f96 R12: dffffc0000000000
R13: ffff888018666680 R14: dffffc0000000000 R15: ffffffffffffffff
FS: 00007fb0ac4ab6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffbc8 CR3: 000000002faf9000 CR4: 00000000003506f0
DR0: 0000000000000008 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__fortify_strlen include/linux/fortify-string.h:228 [inline]
trace_event_get_offsets_drv_net_setup_tc net/mac80211/trace.h:2499 [inline]
do_trace_event_raw_event_drv_net_setup_tc net/mac80211/trace.h:2490 [inline]
trace_event_raw_event_drv_net_setup_tc+0x109/0x4d0 net/mac80211/trace.h:2490
trace_drv_net_setup_tc net/mac80211/trace.h:2490 [inline]
drv_net_setup_tc net/mac80211/driver-ops.h:1538 [inline]
ieee80211_netdev_setup_tc+0x2c2/0x320 net/mac80211/iface.c:873
tcf_block_offload_cmd+0x235/0x3a0 net/sched/cls_api.c:809
tcf_block_offload_bind net/sched/cls_api.c:846 [inline]
tcf_block_get_ext+0xdf2/0x13d0 net/sched/cls_api.c:1458
tcf_block_get+0x68/0xa0 net/sched/cls_api.c:1493
hfsc_init_qdisc+0x11e/0x390 net/sched/sch_hfsc.c:1412
qdisc_create+0x90f/0x1060 net/sched/sch_api.c:1317
tc_modify_qdisc+0xb47/0x1de0 net/sched/sch_api.c:-1
rtnetlink_rcv_msg+0x843/0xf90 net/core/rtnetlink.c:6484
netlink_rcv_skb+0x235/0x4c0 net/netlink/af_netlink.c:2550
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x7b1/0x930 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1899
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x61b/0x980 net/socket.c:2595
___sys_sendmsg+0x2a6/0x360 net/socket.c:2649
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2687 [inline]
__se_sys_sendmsg+0x1d0/0x2c0 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb0ab59de99
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:00007fb0ac4ab028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fb0ab825fa0 RCX: 00007fb0ab59de99
RDX: 0000000020008850 RSI: 00002000000012c0 RDI: 0000000000000005
RBP: 00007fb0ab633eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb0ab826038 R14: 00007fb0ab825fa0 R15: 00007ffd0fdebe78
</TASK>
Modules linked in:
CR2: fffffffffffffbc8
---[ end trace 0000000000000000 ]---
RIP: 0010:strlen+0x39/0x70 lib/string.c:425
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:ffffc9000445ebf8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: fffffffffffffbc9 RCX: 0000000000080000
RDX: ffffc9000d72b000 RSI: 0000000000000d84 RDI: fffffffffffffbc8
RBP: ffffc9000445ed28 R08: ffffffff8e8c7caf R09: 1ffffffff1d18f95
R10: dffffc0000000000 R11: fffffbfff1d18f96 R12: dffffc0000000000
R13: ffff888018666680 R14: dffffc0000000000 R15: ffffffffffffffff
FS: 00007fb0ac4ab6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffbc8 CR3: 000000002faf9000 CR4: 00000000003506f0
DR0: 0000000000000008 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
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


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