INFO: task syz.4.5702:27028 blocked for more than 144 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.5702      state:D stack:25600 pid:27028 tgid:27028 ppid:26765  task_flags:0x40044c flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 exit_mm+0x73/0x220
 do_exit+0x6a2/0x23c0
 do_group_exit+0x21b/0x2d0
 get_signal+0x1284/0x1330
 arch_do_signal_or_restart+0xbc/0x830
 irqentry_exit+0x176/0x620
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f360de71096
RSP: 002b:00007fffbd55ddc0 EFLAGS: 00010202
RAX: 000000110c3b0000 RBX: ffffffff8535e55e RCX: 0000000000000003
RDX: 000000000000055e RSI: 0000000000001795 RDI: 0000000000000008
RBP: 0000000000000000 R08: 00007f360e200000 R09: 00007f360e202000
R10: 000000008535e562 R11: 000000000000000d R12: 00007f360e216038
R13: 000000000000737f R14: ffffffff8535e55e R15: 00007f360ed45720
 </TASK>
INFO: task syz.4.5702:27041 blocked for more than 144 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.5702      state:D stack:23704 pid:27041 tgid:27028 ppid:26765  task_flags:0x40054c flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 exit_mm+0x73/0x220
 do_exit+0x6a2/0x23c0
 do_group_exit+0x21b/0x2d0
 get_signal+0x1284/0x1330
 arch_do_signal_or_restart+0xbc/0x830
 exit_to_user_mode_loop+0x86/0x480
 do_syscall_64+0x32d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f360df9c799
RSP: 002b:00007f360eda70e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f360e216098 RCX: 00007f360df9c799
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f360e216098
RBP: 00007f360e216090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f360e216128 R14: 00007fffbd55dc40 R15: 00007fffbd55dd28
 </TASK>

Showing all locks held in the system:
5 locks held by kworker/u8:1/13:
 #0: ffff8881012ae148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9ea/0x1830
 #1: ffffc90000127c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa25/0x1830
 #2: ffffffff8fbbe630 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800
 #3: ffffffff8fbccdc8 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x940
 #4: ffffffff8e764678 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
1 lock held by khungtaskd/35:
 #0: ffffffff8e75e3e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by dhcpcd/5552:
 #0: ffffffff8fbccdc8 (rtnl_mutex){+.+.}-{4:4}, at: devinet_ioctl+0x32b/0x1b30
2 locks held by getty/5634:
 #0: ffff8881113010a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
2 locks held by sshd/5743:
3 locks held by kworker/1:7/10097:
 #0: ffff88810006b148 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9ea/0x1830
 #1: ffffc90007787c40 ((fqdir_free_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa25/0x1830
 #2: ffffffff8e764540 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x580
3 locks held by kworker/u10:4/22925:
 #0: ffff8881000ac148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9ea/0x1830
 #1: ffffc90003fd7c40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa25/0x1830
 #2: ffffffff8fbccdc8 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
1 lock held by syz.4.5702/27028:
 #0: ffff88819852ccc0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mm+0x73/0x220
7 locks held by syz.4.5702/27030:
1 lock held by syz.4.5702/27041:
 #0: ffff88819852ccc0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mm+0x73/0x220
2 locks held by syz-executor/27157:
 #0: ffffffff8fbbe630 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
 #1: ffffffff8e764540 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x580
2 locks held by syz-executor/27175:
 #0: ffffffff8f330288 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250
 #1: ffffffff8fbccdc8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a1/0x1be0
1 lock held by syz-executor/27181:
 #0: ffffffff8fbccdc8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a1/0x1be0
1 lock held by syz-executor/27184:
 #0: ffffffff8fbccdc8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a1/0x1be0

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 27030 Comm: syz.4.5702 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:native_apic_msr_write+0x39/0x50
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 e9 50 e0 3b 0a cc 89 f6 31 d2 e9 36 c3 76 03 66 0f 1f 44 00
RSP: 0018:ffffc90000a07fb0 EFLAGS: 00000046
RAX: 00000000000001ec RBX: ffff88823c623e40 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 00000000000001ec RDI: 0000000000000838
RBP: 0000000000000000 R08: ffffffff81d15fa2 R09: ffffffff8e75e3e0
R10: 3e2d735f5f5f5f26 R11: ffffffff8173caf0 R12: 000000000fffe37a
R13: dffffc0000000000 R14: 00000000000001ec R15: 0000000000000020
FS:  00007f360edc86c0(0000) GS:ffff8882a9463000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f96d56de866 CR3: 00000001a87fa000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x1c9/0x350
 hrtimer_interrupt+0xb08/0x1010
 __sysvec_apic_timer_interrupt+0x102/0x460
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x20b/0x2e0
Code: e9 30 ff ff ff e8 35 69 0c 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 b1 46 7a 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 16 4f 0f 0a cc 48 8d 3d 3e 55 73
RSP: 0018:ffffc90000a08220 EFLAGS: 00000292
RAX: 7c481f3102657e00 RBX: 0000000000000246 RCX: 0000000000000102
RDX: 000000007f45ee1d RSI: ffffffff8e165502 RDI: ffffffff8c27b400
RBP: 0000000000000000 R08: ffffffff81d15fa2 R09: ffffffff8e75e3e0
R10: dffffc0000000000 R11: fffff91fffdc4405 R12: 0000000000000002
R13: ffffffff8e75e3e0 R14: 0000000000000000 R15: 0000000000000000
 trace_call_bpf+0xe3/0xb70
 perf_trace_run_bpf_submit+0x78/0x170
 perf_trace_lock+0x32d/0x410
 lock_release+0x392/0x3d0
 unwind_next_frame+0x1aaa/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
 __netdev_alloc_skb+0xc1/0x810
 __ieee80211_beacon_get+0xc06/0x1880
 ieee80211_beacon_get_tim+0xbd/0x2c0
 mac80211_hwsim_beacon_tx+0x3c5/0x870
 __iterate_interfaces+0x2ab/0x590
 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180
 mac80211_hwsim_beacon+0xbb/0x180
 __hrtimer_run_queues+0x53a/0xcc0
 hrtimer_run_softirq+0x182/0x5a0
 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:__schedule+0x17c/0x52d0
Code: 10 48 8d 58 20 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 93 1c 81 f6 48 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 30 00 <74> 08 48 89 df e8 7a 1c 81 f6 48 81 3b 9d 6e ac 57 0f 85 8a 1a 00
RSP: 0018:ffffc90008f46e60 EFLAGS: 00000246
RAX: 1ffff920011e8000 RBX: ffffc90008f40000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8c27b3e0 RDI: ffffffff8c27b3a0
RBP: ffffc90008f47060 R08: ffffffff90118bb7 R09: 1ffffffff2023176
R10: dffffc0000000000 R11: fffffbfff2023177 R12: ffff8882a9463000
R13: 0000000000000001 R14: dffffc0000000000 R15: 1ffff110478c75b3
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x599/0x620
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_release+0x392/0x3d0
Code: 54 79 08 00 48 8b 1d ad 16 da 0c 65 48 ff 03 48 8b 05 72 06 5a 0e 48 85 c0 74 0f 48 8b 78 08 4c 89 e6 4c 89 fa e8 ae 18 ff ff <48> c7 c0 ff e1 7b 8e 48 3d 00 10 00 00 4d 89 fd 4d 89 e6 0f 82 7f
RSP: 0018:ffffc90008f47190 EFLAGS: 00000246
RAX: 7c481f3102657e00 RBX: ffffffff931c6140 RCX: 0000000000000000
RDX: ffffc90024207000 RSI: 000000000006c0e8 RDI: 000000000006c0e9
RBP: dffffc0000000000 R08: ffffc90008f46faf R09: 0000000000000000
R10: ffffc90008f46fa0 R11: ffffffffa0001e08 R12: ffffffff8e75e3e0
R13: ffffffff81767de5 R14: ffffffff8e75e3e0 R15: ffffffff81767de5
 unwind_next_frame+0x1aaa/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 kmem_cache_free+0x426/0x630
 __put_anon_vma+0x12b/0x2d0
 anon_vma_fork+0x246/0x570
 dup_mmap+0x991/0x1d90
 copy_mm+0x13b/0x4b0
 copy_process+0x18b6/0x3cf0
 kernel_clone+0x248/0x8e0
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f360df9c799
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:00007f360edc7fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f360e215fa0 RCX: 00007f360df9c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f360e032c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f360e216038 R14: 00007f360e215fa0 R15: 00007fffbd55dd28
 </TASK>
