INFO: task syz.2.79:6126 blocked for more than 143 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.79        state:D stack:26720 pid:6126  tgid:6119  ppid:5811   task_flags:0x40044c flags:0x00080001
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_timeout+0xc3/0x2c0
 wait_for_completion+0x2cc/0x5e0
 __synchronize_srcu+0x329/0x3e0
 perf_trace_event_unreg+0xc5/0x1c0
 perf_trace_destroy+0xa4/0x150
 __free_event+0x34e/0x7e0
 perf_event_release_kernel+0x45b/0x510
 perf_release+0x38/0x50
 __fput+0x44f/0xa70
 task_work_run+0x1d9/0x270
 do_exit+0x70f/0x23c0
 do_group_exit+0x21b/0x2d0
 get_signal+0x1284/0x1330
 arch_do_signal_or_restart+0xbc/0x830
 exit_to_user_mode_loop+0x86/0x480
 ret_from_fork+0x59d/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task syz.1.80:6122 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.80        state:D stack:25152 pid:6122  tgid:6122  ppid:5806   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 perf_remove_from_owner+0x242/0x4b0
 perf_event_release_kernel+0x83/0x510
 perf_release+0x38/0x50
 __fput+0x44f/0xa70
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xed/0x480
 do_syscall_64+0x32d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2dec19c799
RSP: 002b:00007ffe6781df18 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f2dec417da0 RCX: 00007f2dec19c799
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f2dec417da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f2dec417cb0 R11: 0000000000000246 R12: 0000000000011926
R13: 00007f2dec41609c R14: 0000000000011946 R15: 00007f2dec416090
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/0:0/9:
3 locks held by kworker/u8:0/12:
 #0: ffff8881732b7948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90000117c40 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffffffff8fbceb48 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30
2 locks held by kworker/u10:0/27:
 #0: ffff8881000ac148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffff88823c624588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e5e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
4 locks held by kworker/u11:0/55:
 #0: ffff88816bdad148 ((wq_completion)hci10#2){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90000bf7c40 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff888175a580c0 (&hdev->lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x9b/0x950
 #3: ffffffff8fd5bc28 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x54c/0x950
2 locks held by kworker/u9:3/83:
3 locks held by kworker/u9:5/570:
 #0: ffff8881000ac148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90003d77c40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffffffff8fbceb48 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
3 locks held by kworker/0:2/783:
3 locks held by kworker/1:2/3145:
 #0: ffff88810006b148 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc9000979fc40 ((work_completion)(&fw_work->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffffffff8fbceb48 (rtnl_mutex){+.+.}-{4:4}, at: regdb_fw_cb+0x7d/0x1c0
6 locks held by kworker/u11:1/5198:
 #0: ffff8881b5e05948 ((wq_completion)hci0){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90023f3fc40 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff88816c6d0ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d3/0x400
 #3: ffff88816c6d00c0 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0xa6f/0x1190
 #4: ffffffff8fd5bc28 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x165/0x340
 #5: ffff888110bfd2f8 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5c0
2 locks held by getty/5631:
 #0: ffff8881730970a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
5 locks held by kworker/u11:2/5809:
 #0: ffff8881b5e03948 ((wq_completion)hci2){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc9000628fc40 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff88816cdbcec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d3/0x400
 #3: ffff88816cdbc0c0 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0xa6f/0x1190
 #4: ffffffff8fd5bc28 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x165/0x340
4 locks held by kworker/u11:3/5815:
 #0: ffff8881b4b6c148 ((wq_completion)hci9#2){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc900062cfc40 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff888175f700c0 (&hdev->lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x9b/0x950
 #3: ffffffff8fd5bc28 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x54c/0x950
3 locks held by kworker/0:4/5860:
 #0: ffff888100069d48 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc900065dfc40 ((reg_check_chans).work){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffffffff8fbceb48 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0xa5/0xfe0
2 locks held by kworker/1:5/5874:
 #0: ffff88810006b148 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc9000663fc40 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
1 lock held by syz.2.79/6126:
 #0: ffffffff8e7ceb68 (event_mutex){+.+.}-{4:4}, at: perf_trace_destroy+0x2e/0x150
1 lock held by syz.1.80/6122:
 #0: ffff8881701ecf88 (&child->perf_event_mutex/1){+.+.}-{4:4}, at: perf_remove_from_owner+0x242/0x4b0
2 locks held by syz.1.80/6123:
1 lock held by syz-executor/6161:
 #0: ffffffff8fbc03d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
2 locks held by dhcpcd/6163:
 #0: ffff8881b9aec408 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x9b/0x240
 #1: ffffffff8e764878 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by dhcpcd/6164:
 #0: ffff88811ec52008 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x9b/0x240
1 lock held by dhcpcd/6165:
 #0: ffff88811ec50e08 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x9b/0x240
1 lock held by dhcpcd/6166:
 #0: ffff88811ec57408 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x9b/0x240
1 lock held by dhcpcd/6167:
 #0: ffff88811ec52608 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x9b/0x240
1 lock held by dhcpcd/6168:
 #0: ffff88811ec4f408 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x9b/0x240
1 lock held by syz-executor/6171:
 #0: ffffffff8fbceb48 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/6172:
 #0: ffffffff8fbceb48 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/6179:
 #0: ffffffff8fbceb48 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/6185:
 #0: ffffffff8fbceb48 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/6189:
 #0: ffffffff8fbceb48 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
4 locks held by kworker/u11:5/6191:
 #0: ffff888116139148 ((wq_completion)hci11#2){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc9000692fc40 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff8881b5cd40c0 (&hdev->lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x9b/0x950
 #3: ffffffff8fd5bc28 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x54c/0x950
1 lock held by syz-executor/6193:
 #0: ffffffff8fbceb48 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6123 Comm: syz.1.80 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:kasan_byte_accessible+0x16/0x30
Code: 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df 0f b6 04 07 <3c> 08 0f 92 c0 c3 cc cc cc cc cc 66 66 66 66 66 66 2e 0f 1f 84 00
RSP: 0018:ffffc90000007560 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffffffff81767eb2 RCX: 0000000000000102
RDX: 0000000000000000 RSI: ffffffff81767eb2 RDI: 1ffffffff1cebcbc
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff81b0c390 R12: 0000000000000002
R13: ffffffff8e75e5e0 R14: ffffffff8e75e5e0 R15: 0000000000000000
FS:  00007f2ded0886c0(0000) GS:ffff88818de5a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6788ec8035 CR3: 000000011531c000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __kasan_check_byte+0x12/0x40
 lock_acquire+0x79/0x2e0
 unwind_next_frame+0xc2/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x384/0x690
 __alloc_skb+0x1d0/0x7d0
 ndisc_alloc_skb+0x9f/0x480
 ndisc_send_rs+0x2b5/0x630
 addrconf_rs_timer+0x395/0x6d0
 call_timer_fn+0x192/0x640
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x22a/0x870
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__mutex_unlock_slowpath+0x6e3/0x7d0
Code: ff ff ff 43 c6 44 2c 04 f8 bf 01 00 00 00 e8 b4 ac e3 f5 48 8b 7c 24 10 48 8b 74 24 30 e8 15 30 01 00 48 8d 9c 24 80 00 00 00 <48> 89 df e8 d5 c7 e3 f5 48 c7 84 24 80 00 00 00 01 00 00 00 48 8b
RSP: 0018:ffffc900075afbe0 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffc900075afc60 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffffffff8def8e53 RDI: 00000000ffffffff
RBP: ffffc900075afcf0 R08: ffffffff9011b4b7 R09: 1ffffffff2023696
R10: dffffc0000000000 R11: fffffbfff2023697 R12: 1ffff92000eb5f84
R13: dffffc0000000000 R14: ffff88816995d7c0 R15: ffff8881701ecf20
 __se_sys_perf_event_open+0x1ab3/0x1d60
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2dec19c799
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:00007f2ded088028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f2dec415fa0 RCX: 00007f2dec19c799
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000000c0
RBP: 00007f2dec232c99 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2dec416038 R14: 00007f2dec415fa0 R15: 00007ffe6781ddb8
 </TASK>
