INFO: task syz.2.19:4390 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.19        state:D stack:26960 pid: 4390 ppid:  4336 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
 __mutex_lock_common+0xdf5/0x2400 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 trace_array_get kernel/trace/trace.c:451 [inline]
 tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
 do_dentry_open+0x7f7/0xf90 fs/open.c:826
 do_open fs/namei.c:3659 [inline]
 path_openat+0x2718/0x2fb0 fs/namei.c:3793
 do_filp_open+0x1df/0x400 fs/namei.c:3820
 do_sys_openat2+0x14b/0x500 fs/open.c:1255
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_openat fs/open.c:1287 [inline]
 __se_sys_openat fs/open.c:1282 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1282
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f82a3f0f159
RSP: 002b:00007ffea2fb4a08 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f82a4196fa0 RCX: 00007f82a3f0f159
RDX: 0000000000000000 RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007f82a3fa606b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f82a4196fac R14: 00007f82a4196fa0 R15: 00007f82a4196fa0
 </TASK>
INFO: task syz.1.18:4393 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.18        state:D stack:27120 pid: 4393 ppid:  4333 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
 __mutex_lock_common+0xdf5/0x2400 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 trace_array_get kernel/trace/trace.c:451 [inline]
 tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
 do_dentry_open+0x7f7/0xf90 fs/open.c:826
 do_open fs/namei.c:3659 [inline]
 path_openat+0x2718/0x2fb0 fs/namei.c:3793
 do_filp_open+0x1df/0x400 fs/namei.c:3820
 do_sys_openat2+0x14b/0x500 fs/open.c:1255
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_openat fs/open.c:1287 [inline]
 __se_sys_openat fs/open.c:1282 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1282
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f21b316e159
RSP: 002b:00007ffcf7fa31f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f21b33f5fa0 RCX: 00007f21b316e159
RDX: 0000000000000000 RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007f21b320506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f21b33f5fac R14: 00007f21b33f5fa0 R15: 00007f21b33f5fa0
 </TASK>
INFO: task syz.0.17:4404 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17        state:D stack:27152 pid: 4404 ppid:  4331 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
 __mutex_lock_common+0xdf5/0x2400 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 trace_array_get kernel/trace/trace.c:451 [inline]
 tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
 do_dentry_open+0x7f7/0xf90 fs/open.c:826
 do_open fs/namei.c:3659 [inline]
 path_openat+0x2718/0x2fb0 fs/namei.c:3793
 do_filp_open+0x1df/0x400 fs/namei.c:3820
 do_sys_openat2+0x14b/0x500 fs/open.c:1255
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_openat fs/open.c:1287 [inline]
 __se_sys_openat fs/open.c:1282 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1282
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7ff2945f0159
RSP: 002b:00007ffff621b418 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ff294877fa0 RCX: 00007ff2945f0159
RDX: 0000000000000000 RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007ff29468706b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff294877fac R14: 00007ff294877fa0 R15: 00007ff294877fa0
 </TASK>
INFO: task syz.4.21:4405 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:27120 pid: 4405 ppid:  4342 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
 __mutex_lock_common+0xdf5/0x2400 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 trace_array_get kernel/trace/trace.c:451 [inline]
 tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
 do_dentry_open+0x7f7/0xf90 fs/open.c:826
 do_open fs/namei.c:3659 [inline]
 path_openat+0x2718/0x2fb0 fs/namei.c:3793
 do_filp_open+0x1df/0x400 fs/namei.c:3820
 do_sys_openat2+0x14b/0x500 fs/open.c:1255
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_openat fs/open.c:1287 [inline]
 __se_sys_openat fs/open.c:1282 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1282
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fa17a0a9159
RSP: 002b:00007ffda9b81578 EFLAGS: 00000246
 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fa17a330fa0 RCX: 00007fa17a0a9159
RDX: 0000000000000000 RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007fa17a14006b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa17a330fac R14: 00007fa17a330fa0 R15: 00007fa17a330fa0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8c31ef60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
3 locks held by kworker/u4:2/154:
2 locks held by getty/3939:
 #0: ffff88802cab4098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc90002cf62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x594/0x1a50 drivers/tty/n_tty.c:2158
2 locks held by kworker/0:3/4245:
 #0: ffff888016c72138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: ffffc90002f4fd00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
4 locks held by kworker/u4:7/4299:
 #0: ffff888016c79138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: ffffc9000309fd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
 #2: ffffffff8d44d548 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:251
 #3: ffffffff8c3239e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
 #3: ffffffff8c3239e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2d1/0x750 kernel/rcu/tree_exp.h:845
7 locks held by syz.3.20/4385:
3 locks held by kworker/1:7/4386:
 #0: ffff88802b711138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: ffffc900032ffd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
 #2: 
ffffffff8d44d548 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xc4/0x1530 net/ipv6/addrconf.c:4120
1 lock held by syz.2.19/4390:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.1.18/4393:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.0.17/4404:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.4.21/4405:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.5.22/4427:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.7.24/4480:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.6.23/4481:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.9.26/4503:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.8.25/4504:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.1.30/4588:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.2.32/4599:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.0.39/4614:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.4.41/4619:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.5.73/4684:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.7.78/4717:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.6.85/4735:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.8.90/4750:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.9.113/4776:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.1.126/4820:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.2.132/4841:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz-executor/4857:
 #0: ffffffff8d44d548 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d44d548 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x79f/0xf10 net/core/rtnetlink.c:5695
1 lock held by syz.0.139/4865:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz.4.148/4884:
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:451 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:501 [inline]
 #0: ffffffff8c361568 (trace_types_lock){+.+.}-{3:3}, at: tracing_buffers_open+0x7f/0x4b0 kernel/trace/trace.c:8117
1 lock held by syz-executor/4885:
 #0: ffffffff8d44d548 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d44d548 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x79f/0xf10 net/core/rtnetlink.c:5695
4 locks held by syz.3.179/4907:

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

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 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xe1b/0xe60 kernel/hung_task.c:369
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4299 Comm: kworker/u4:7 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: bat_events batadv_nc_worker
RIP: 0010:trace_lock_release include/trace/events/lock.h:58 [inline]
RIP: 0010:lock_release+0xae/0x8a0 kernel/locking/lockdep.c:5636
Code: 83 fb 08 0f 83 4e 05 00 00 89 d8 c1 e8 06 48 8d 3c c5 e8 1e 8b 8d be 08 00 00 00 e8 5c dc 60 00 89 d8 48 0f a3 05 4a b1 2d 0c <73> 0d e8 5b 47 07 00 84 c0 0f 84 53 05 00 00 48 c7 c0 84 52 8b 8d
RSP: 0018:ffffc9000309fac0 EFLAGS: 00000257
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff815d6d94
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8d8b1ee8
RBP: ffffc9000309fbd0 R08: ffffffff8d8b1eef R09: 1ffffffff1b163dd
R10: dffffc0000000000 R11: fffffbfff1b163de R12: 1ffff92000613f64
R13: dffffc0000000000 R14: ffff88801dc6cc80 R15: ffff88802a37f310
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e563fff CR3: 000000006feaa000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rcu_read_unlock include/linux/rcupdate.h:773 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:416 [inline]
 batadv_nc_worker+0x255/0x5c0 net/batman-adv/network-coding.c:723
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>