INFO: task kworker/0:1:13570 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:1     state:D stack:23824 pid:13570 ppid:2      flags:0x00004000
Workqueue: events __set_printk_clr_event
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5257 [inline]
 __schedule+0x1089/0x4140 kernel/sched/core.c:6584
 schedule+0xb9/0x180 kernel/sched/core.c:6660
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6719
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x562/0xb40 kernel/locking/mutex.c:747
 __ftrace_set_clr_event kernel/trace/trace_events.c:1219 [inline]
 trace_set_clr_event+0xbe/0x130 kernel/trace/trace_events.c:1285
 __set_printk_clr_event+0x1e/0x70 kernel/trace/bpf_trace.c:416
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: task syz.2.3180:16230 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.3180      state:D
 stack:27888 pid:16230 ppid:14854  flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5257 [inline]
 __schedule+0x1089/0x4140 kernel/sched/core.c:6584
 schedule+0xb9/0x180 kernel/sched/core.c:6660
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6719
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x562/0xb40 kernel/locking/mutex.c:747
 trace_array_get kernel/trace/trace.c:461 [inline]
 tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 tracing_open_generic_tr+0x82/0x180 kernel/trace/trace.c:4870
 system_tr_open+0x86/0x110 kernel/trace/trace_events.c:1952
 do_dentry_open+0x7dd/0x10b0 fs/open.c:882
 do_open fs/namei.c:3677 [inline]
 path_openat+0x2674/0x2f10 fs/namei.c:3838
 do_filp_open+0x1ee/0x420 fs/namei.c:3865
 do_sys_openat2+0x14b/0x4f0 fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1347
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7eff125a8f19
RSP: 002b:00007eff134ac028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007eff12825fa0 RCX: 00007eff125a8f19
RDX: 0000000000000001 RSI: 0000200000003d80 RDI: ffffffffffffff9c
RBP: 00007eff12637f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007eff12826038 R14: 00007eff12825fa0 R15: 00007ffc374abb28
 </TASK>
INFO: task syz.7.3245:16437 blocked for more than 145 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.3245      state:D stack:27808 pid:16437 ppid:15658  flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5257 [inline]
 __schedule+0x1089/0x4140 kernel/sched/core.c:6584
 schedule+0xb9/0x180 kernel/sched/core.c:6660
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6719
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x562/0xb40 kernel/locking/mutex.c:747
 event_trigger_regex_open kernel/trace/trace_events_trigger.c:215 [inline]
 event_trigger_open+0x4e/0x2d0 kernel/trace/trace_events_trigger.c:339
 do_dentry_open+0x7dd/0x10b0 fs/open.c:882
 do_open fs/namei.c:3677 [inline]
 path_openat+0x2674/0x2f10 fs/namei.c:3838
 do_filp_open+0x1ee/0x420 fs/namei.c:3865
 do_sys_openat2+0x14b/0x4f0 fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1347
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f14559a8f19
RSP: 002b:00007f145693d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f1455c25fa0 RCX: 00007f14559a8f19
RDX: 0000000000000302 RSI: 0000200000000180 RDI: ffffffffffffff9c
RBP: 00007f1455a37f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1455c26038 R14: 00007f1455c25fa0 R15: 00007ffefd431218
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8db2e3f0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xce0 kernel/rcu/tasks.h:543
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8db2ec30 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xce0 kernel/rcu/tasks.h:543
1 lock held by khungtaskd/27:
 #0: ffffffff8db2daa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #0: ffffffff8db2daa0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #0: ffffffff8db2daa0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6669
2 locks held by getty/4030:
 #0: ffff88814d020098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc9000327e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x430/0x1400 drivers/tty/n_tty.c:2198
2 locks held by kworker/0:7/4362:
 #0: ffff888018472138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #1: ffffc90004a47d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
3 locks held by kworker/u4:8/4767:
4 locks held by kworker/u4:11/4827:
 #0: ffff88801861e938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #1: ffffc9000d0e7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #2: ffffffff8ed5ead0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x148/0xba0 net/core/net_namespace.c:594
 #3: ffffffff8db337b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
 #3: ffffffff8db337b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2ec/0x890 kernel/rcu/tree_exp.h:962
3 locks held by kworker/0:1/13570:
 #0: ffff888018470938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #1: ffffc90004d97d00 (set_printk_work){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #2: ffffffff8db82da8 (event_mutex){+.+.}-{3:3}, at: __ftrace_set_clr_event kernel/trace/trace_events.c:1219 [inline]
 #2: ffffffff8db82da8 (event_mutex){+.+.}-{3:3}, at: trace_set_clr_event+0xbe/0x130 kernel/trace/trace_events.c:1285
5 locks held by syz.1.3085/15930:
1 lock held by syz.2.3180/16230:
 #0: ffffffff8db776c8 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db776c8 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db776c8 (trace_types_lock){+.+.}-{3:3}, at: tracing_open_generic_tr+0x82/0x180 kernel/trace/trace.c:4870
2 locks held by syz.7.3245/16437:
 #0: ffff888144ab4460 (sb_writers#30){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402
 #1: ffffffff8db82da8 (event_mutex){+.+.}-{3:3}, at: event_trigger_regex_open kernel/trace/trace_events_trigger.c:215 [inline]
 #1: ffffffff8db82da8 (event_mutex){+.+.}-{3:3}, at: event_trigger_open+0x4e/0x2d0 kernel/trace/trace_events_trigger.c:339
1 lock held by syz.8.3280/16541:
 #0: ffffffff8db776c8 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db776c8 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db776c8 (trace_types_lock){+.+.}-{3:3}, at: tracing_open_generic_tr+0x82/0x180 kernel/trace/trace.c:4870
1 lock held by syz.5.3792/18373:
2 locks held by sed/18439:

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
 watchdog+0xf0e/0xf50 kernel/hung_task.c:377
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 15930 Comm: syz.1.3085 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:put_dec_trunc8+0x1dd/0x340 lib/vsprintf.c:254
Code: 01 00 00 66 44 89 7b 04 48 83 c3 06 89 e8 4c 8d b4 00 c0 6c d2 8b 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 84 c0 75 3d 45 0f b7 36 <48> 89 d8 48 c1 e8 03 42 0f b6 04 20 84 c0 75 3f 66 44 89 33 bf 0a
RSP: 0018:ffffc90003eaf288 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90003eaf342 RCX: 0000000000080000
RDX: ffffc9000cc31000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 000000000000000c R08: ffffc90003eaf357 R09: ffffc90003eaf340
R10: dffffc0000000000 R11: fffff520007d5e6b R12: dffffc0000000000
R13: 000000000000050d R14: 0000000000003132 R15: ffffc90003eaf342
FS:  00007f789ec456c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000f72030 CR3: 00000000581c0000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 number+0x321/0xef0 lib/vsprintf.c:508
 vsnprintf+0x12d3/0x1c20 lib/vsprintf.c:2871
 sprintf+0xe4/0x140 lib/vsprintf.c:3009
 print_time kernel/printk/printk.c:1274 [inline]
 info_print_prefix+0x168/0x360 kernel/printk/printk.c:1300
 record_print_text+0x17e/0x4a0 kernel/printk/printk.c:1349
 console_emit_next_record+0x5a4/0xb50 kernel/printk/printk.c:2760
 console_flush_all kernel/printk/printk.c:-1 [inline]
 console_unlock+0x223/0x630 kernel/printk/printk.c:2906
 vprintk_emit+0x4b3/0x6a0 kernel/printk/printk.c:2303
 _printk+0xda/0x130 kernel/printk/printk.c:2328
 event_subsystem_dir kernel/trace/trace_events.c:2490 [inline]
 event_create_dir+0xbfe/0xe50 kernel/trace/trace_events.c:2582
 __trace_add_new_event kernel/trace/trace_events.c:3078 [inline]
 __trace_add_event_dirs kernel/trace/trace_events.c:3292 [inline]
 event_trace_add_tracer+0x19b/0x3a0 kernel/trace/trace_events.c:3891
 trace_array_create_dir+0x77/0x120 kernel/trace/trace.c:9498
 trace_array_create+0x724/0xcb0 kernel/trace/trace.c:9556
 instance_mkdir+0xc8/0x120 kernel/trace/trace.c:9591
 tracefs_syscall_mkdir+0xb7/0x110 fs/tracefs/inode.c:87
 vfs_mkdir+0x386/0x570 fs/namei.c:4161
 do_mkdirat+0x1d8/0x440 fs/namei.c:4186
 __do_sys_mkdirat fs/namei.c:4201 [inline]
 __se_sys_mkdirat fs/namei.c:4199 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4199
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f789dda8f19
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:00007f789ec45028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f789e025fa0 RCX: 00007f789dda8f19
RDX: 00000000000001ff RSI: 0000200000000300 RDI: ffffffffffffff9c
RBP: 00007f789de37f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f789e026038 R14: 00007f789e025fa0 R15: 00007fffe76b0958
 </TASK>