INFO: task syz.0.17:4567 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:27472 pid:4567  ppid:4452   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x548/0xae0 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+0x88/0xef0 kernel/trace/trace.c:5003
 do_dentry_open+0x7dd/0x10b0 fs/open.c:882
 do_open fs/namei.c:3677 [inline]
 path_openat+0x2674/0x2f10 fs/namei.c:3834
 do_filp_open+0x1ee/0x420 fs/namei.c:3861
 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: 0033:0x7f5da3b9f559
RSP: 002b:00007f5da4a39028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f5da3e25fa0 RCX: 00007f5da3b9f559
RDX: 000000000000001b RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007f5da3c36b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5da3e26038 R14: 00007f5da3e25fa0 R15: 00007ffd101be5b8
 </TASK>
INFO: task syz.2.19:4571 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.19        state:D stack:26864 pid:4571  ppid:4461   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x548/0xae0 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+0x88/0xef0 kernel/trace/trace.c:5003
 do_dentry_open+0x7dd/0x10b0 fs/open.c:882
 do_open fs/namei.c:3677 [inline]
 path_openat+0x2674/0x2f10 fs/namei.c:3834
 do_filp_open+0x1ee/0x420 fs/namei.c:3861
 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: 0033:0x7fec77b9f559
RSP: 002b:00007fec78a8b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fec77e25fa0 RCX: 00007fec77b9f559
RDX: 000000000000001b RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007fec77c36b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fec77e26038 R14: 00007fec77e25fa0 R15: 00007ffd736ee178
 </TASK>
INFO: task syz.3.20:4576 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.20        state:D stack:27472 pid:4576  ppid:4464   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x548/0xae0 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+0x88/0xef0 kernel/trace/trace.c:5003
 do_dentry_open+0x7dd/0x10b0 fs/open.c:882
 do_open fs/namei.c:3677 [inline]
 path_openat+0x2674/0x2f10 fs/namei.c:3834
 do_filp_open+0x1ee/0x420 fs/namei.c:3861
 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: 0033:0x7fd73939f559
RSP: 002b:00007fd73a30c028 EFLAGS: 00000246
 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fd739625fa0 RCX: 00007fd73939f559
RDX: 000000000000001b RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007fd739436b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd739626038 R14: 00007fd739625fa0 R15: 00007ffd506cef68
 </TASK>
INFO: task syz.4.21:4595 blocked for more than 145 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.21        state:D stack:27472 pid:4595  ppid:4463   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x548/0xae0 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+0x88/0xef0 kernel/trace/trace.c:5003
 do_dentry_open+0x7dd/0x10b0 fs/open.c:882
 do_open fs/namei.c:3677 [inline]
 path_openat+0x2674/0x2f10 fs/namei.c:3834
 do_filp_open+0x1ee/0x420 fs/namei.c:3861
 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: 0033:0x7f66d839f559
RSP: 002b:00007f66d9275028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f66d8625fa0 RCX: 00007f66d839f559
RDX: 000000000000001b RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007f66d8436b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f66d8626038 R14: 00007f66d8625fa0 R15: 00007ffff55d0eb8
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8db2e230 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xef0 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8db2ea50 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xef0 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/27:
 #0: ffffffff8db2d8a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #0: ffffffff8db2d8a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #0: ffffffff8db2d8a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6669
2 locks held by kworker/u4:5/2968:
2 locks held by getty/4030:
 #0: ffff88814d3ab098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41e/0x1360 drivers/tty/n_tty.c:2198
3 locks held by kworker/0:6/4323:
 #0: ffff88814d057d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #1: ffffc90004267d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #2: ffffffff8ed760e8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xc4/0x1500 net/ipv6/addrconf.c:4146
5 locks held by syz.1.18/4561:
1 lock held by syz.0.17/4567:
 #0: 
ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.2.19/4571:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.3.20/4576:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.4.21/4595:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.5.22/4691:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.6.23/4700:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.7.24/4704:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.8.25/4708:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.9.26/4712:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.0.27/4749:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.1.35/4794:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.3.30/4799:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.2.29/4803:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.4.31/4810:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.5.36/4824:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.6.37/4889:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.7.38/4900:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.8.39/4919:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.9.40/4922:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
2 locks held by kworker/u4:8/4969:
1 lock held by syz.0.64/5009:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.1.69/5047:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz-executor/5063:
 #0: ffffffff8ed760e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
 #0: ffffffff8ed760e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x80d/0xfb0 net/core/rtnetlink.c:6163
1 lock held by syz.2.74/5068:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
1 lock held by syz.4.79/5088:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003
8 locks held by syz-executor/5099:
 #0: ffff88807de3c460 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x270/0x9a0 fs/read_write.c:580
 #1: ffff888078d93c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1d8/0x520 fs/kernfs/file.c:343
 #2: ffff8881457b43a8 (kn->active#59){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline]
 #2: ffff8881457b43a8 (kn->active#59){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x232/0x520 fs/kernfs/file.c:344
 #3: ffffffff8e66a988 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd3/0x370 drivers/net/netdevsim/bus.c:209
 #4: ffff88805f49b0e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #4: ffff88805f49b0e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1099 [inline]
 #4: ffff88805f49b0e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xb1/0x7c0 drivers/base/dd.c:1302
 #5: ffff88805f49e2f8 (&devlink->lock_key#18){+.+.}-{3:3}, at: nsim_drv_remove+0x54/0x170 drivers/net/netdevsim/dev.c:1678
 #6: ffffffff8ed760e8 (rtnl_mutex){+.+.}-{3:3}, at: nsim_destroy+0x3b/0x150 drivers/net/netdevsim/netdev.c:381
 #7: ffffffff8db33578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
 #7: ffffffff8db33578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2ec/0x890 kernel/rcu/tree_exp.h:962
2 locks held by syz-executor/5129:
 #0: ffffffff8ed69250 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x324/0x5b0 net/core/net_namespace.c:504
 #1: ffffffff8ed760e8 (rtnl_mutex){+.+.}-{3:3}, at: ip_tunnel_init_net+0x29c/0x7a0 net/ipv4/ip_tunnel.c:1103
1 lock held by syz.3.91/5134:
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
 #0: ffffffff8db77488 (trace_types_lock){+.+.}-{3:3}, at: tracing_open+0x88/0xef0 kernel/trace/trace.c:5003

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 33 Comm: kworker/u4:2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:unwind_next_frame+0x710/0x1fd0 arch/x86/kernel/unwind_orc.c:-1
Code: f2 48 c1 ea 03 0f b6 04 2a 84 c0 0f 85 8a 12 00 00 41 0f b6 45 01 83 e0 03 ff 24 c5 70 88 a9 8a 48 89 54 24 18 4c 89 74 24 50 <4c> 89 7c 24 08 4c 89 64 24 20 48 8d 7b 08 49 89 ff 49 c1 ef 03 41
RSP: 0018:ffffc90000aa7620 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90000aa76c8 RCX: ffffffff8f39d748
RDX: 1ffffffff1f5bb88 RSI: ffffffff8f39d724 RDI: 0000000000000001
RBP: dffffc0000000000 R08: 0000000000000010 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000154ee5 R12: ffffffff8faddc42
R13: ffffffff8faddc46 R14: ffffffff8faddc47 R15: 1ffffffff1f5bb88
FS:  0000000000000000(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555557aaf4e8 CR3: 000000007e67e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 __kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x4b/0x490 mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 kmem_cache_alloc_node+0x1ad/0x310 mm/slub.c:3404
 __alloc_skb+0xf9/0x7d0 net/core/skbuff.c:505
 alloc_skb include/linux/skbuff.h:1303 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
 nsim_dev_trap_report_work+0x24f/0xa80 drivers/net/netdevsim/dev.c:851
 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>