[syzbot] [trace?] INFO: task hung in ftrace_set_clr_event

[syzbot <syzbot+1b4a3085f6696737b17c@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    f5bbbfec59b4 Merge tag 'probes-fixes-v7.2-rc7' of git://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12e49079580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=aaf0da806f995318
dashboard link: https://syzkaller.appspot.com/bug?extid=1b4a3085f6696737b17c
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=150d92c6580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/08bbc8b1ab0d/disk-f5bbbfec.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/88902debf200/vmlinux-f5bbbfec.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6cb284c6dea8/bzImage-f5bbbfec.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1b4a3085f6696737b17c@syzkaller.appspotmail.com

INFO: task syz.0.17:6034 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17        state:D stack:27496 pid:6034  tgid:6033  ppid:5744   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7326
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7383
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0x7bf/0x1550 kernel/locking/mutex.c:821
 __ftrace_set_clr_event kernel/trace/trace_events.c:1409 [inline]
 ftrace_set_clr_event+0x3ba/0x5c0 kernel/trace/trace_events.c:1460
 ftrace_event_write+0x1fe/0x2b0 kernel/trace/trace_events.c:1548
 vfs_write+0x296/0xba0 fs/read_write.c:685
 ksys_write+0x150/0x270 fs/read_write.c:739
 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: 0033:0x7fc695d9e0d9
RSP: 002b:00007fc696c90028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fc696025fa0 RCX: 00007fc695d9e0d9
RDX: 0000000000000002 RSI: 0000200000000040 RDI: 0000000000000003
RBP: 00007fc695e35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc696026038 R14: 00007fc696025fa0 R15: 00007ffd5a54d898
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u8:0/12:
4 locks held by kworker/1:0/24:
 #0: ffff88801b02b140 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
 #0: ffff88801b02b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
 #1: ffffc900001e7c40 (reg_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
 #1: ffffc900001e7c40 (reg_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
 #2: ffffffff90027f40 (rtnl_mutex){+.+.}-{4:4}, at: reg_todo+0x1c/0xa40 net/wireless/reg.c:3205
 #3: ffff88806a4807a0 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6884 [inline]
 #3: ffff88806a4807a0 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_process_self_managed_hints+0x8d/0x160 net/wireless/reg.c:3195
1 lock held by khungtaskd/32:


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