INFO: task dhcpcd:5574 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:19992 pid:5574  tgid:5574  ppid:5573   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 devinet_ioctl+0x32b/0x1b30
 inet_ioctl+0x42a/0x560
 sock_do_ioctl+0x101/0x320
 sock_ioctl+0x5c6/0x7f0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0f44c9cd49
RSP: 002b:00007ffd5eb8d218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0f44bce6c0 RCX: 00007f0f44c9cd49
RDX: 00007ffd5eb9d408 RSI: 0000000000008914 RDI: 000000000000001e
RBP: 00007ffd5ebad5c8 R08: 00007ffd5eb9d3c8 R09: 00007ffd5eb9d378
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd5eb9d408 R14: 0000000000000028 R15: 0000000000008914
 </TASK>
INFO: task kworker/u8:5:6002 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:5    state:D stack:21984 pid:6002  tgid:6002  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 rtnl_net_dev_lock+0x257/0x2f0
 unregister_netdevice_notifier_dev_net+0x96/0x440
 nsim_destroy+0xd9/0x680
 __nsim_dev_port_del+0x14d/0x1b0
 nsim_dev_reload_destroy+0x288/0x490
 nsim_dev_reload_down+0x8a/0xc0
 devlink_reload+0x1d1/0x8e0
 devlink_pernet_pre_exit+0x1e6/0x3f0
 ops_undo_list+0x187/0x940
 cleanup_net+0x4df/0x7b0
 process_scheduled_works+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task kworker/u10:0:1890 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u10:0   state:D stack:24568 pid:1890  tgid:1890  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound linkwatch_event
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 linkwatch_event+0xe/0x60
 process_scheduled_works+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task syz-executor:4899 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22392 pid:4899  tgid:4899  ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 del_device_store+0xd7/0x370
 kernfs_fop_write_iter+0x3af/0x540
 vfs_write+0x61d/0xb90
 ksys_write+0x150/0x270
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f16eb35b58e
RSP: 002b:00007ffc83820008 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000055558173f500 RCX: 00007f16eb35b58e
RDX: 0000000000000001 RSI: 00007ffc83820090 RDI: 0000000000000005
RBP: 00007f16eb408a60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc83820090 R14: 00007f16ec144620 R15: 0000000000000003
 </TASK>
INFO: task syz-executor:4906 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22392 pid:4906  tgid:4906  ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 del_device_store+0xd7/0x370
 kernfs_fop_write_iter+0x3af/0x540
 vfs_write+0x61d/0xb90
 ksys_write+0x150/0x270
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f225195b58e
RSP: 002b:00007ffcd566dfb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000055555b194500 RCX: 00007f225195b58e
RDX: 0000000000000001 RSI: 00007ffcd566e040 RDI: 0000000000000005
RBP: 00007f2251a08a60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffcd566e040 R14: 00007f2252744620 R15: 0000000000000003
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e35a3a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by dhcpcd/5574:
 #0: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: devinet_ioctl+0x32b/0x1b30
2 locks held by getty/5653:
 #0: ffff88816daef0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900033802f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
6 locks held by kworker/u8:5/6002:
 #0: ffff888100ef7948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90005e07bc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f79a910 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xfe/0x7b0
 #3: ffff8881130010e8 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x117/0x3f0
 #4: ffff888113002250 (&devlink->lock_key#29){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x129/0x3f0
 #5: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_dev_lock+0x257/0x2f0
3 locks held by kworker/1:8/10155:
 #0: ffff888100076948 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc900057e7bc0 ((reg_check_chans).work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0xa5/0xf40
3 locks held by kworker/u8:0/838:
 #0: ffff88810fb6c948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc900085afbc0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30
3 locks held by kworker/u10:0/1890:
 #0: ffff888100089948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc9000971fbc0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
4 locks held by syz.6.12443/4886:
4 locks held by syz-executor/4899:
 #0: ffff88817076e420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x227/0xb90
 #1: ffff888110f5e488 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1de/0x540
 #2: ffff88810a7aca58 (kn->active#53){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x231/0x540
 #3: ffffffff8f021268 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd7/0x370
4 locks held by syz-executor/4906:
 #0: ffff88817076e420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x227/0xb90
 #1: ffff88816e231488 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1de/0x540
 #2: ffff88810a7aca58 (kn->active#53){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x231/0x540
 #3: ffffffff8f021268 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd7/0x370
7 locks held by syz-executor/4911:
 #0: ffff88817076e420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x227/0xb90
 #1: ffff888171c3e888 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1de/0x540
 #2: ffff88810a7aca58 (kn->active#53){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x231/0x540
 #3: ffffffff8f021268 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd7/0x370
 #4: ffff8881105a80e8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb6/0x800
 #5: ffff8881046b9250 (&devlink->lock_key#25){+.+.}-{4:4}, at: nsim_drv_remove+0x50/0x160
 #6: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_dev_lock+0x257/0x2f0
1 lock held by syz-executor/4969:
 #0: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/4972:
 #0: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/4974:
 #0: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/4981:
 #0: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/4983:
 #0: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/4985:
 #0: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0

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

NMI backtrace for cpu 1
CPU: 1 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+0xf90/0xfe0
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 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: 4886 Comm: syz.6.12443 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:__local_bh_disable_ip+0x0/0xd0
Code: 5d c3 cc cc cc cc cc e8 3e 8b f2 09 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 41 56 53 89 f3 65 8b 05 50 4d 49 11 a9 00 00 0f 00 0f
RSP: 0018:ffffc90000007640 EFLAGS: 00000286
RAX: 1ffff92000000f8e RBX: ffff88811dfc9728 RCX: ffff88816acaba80
RDX: 0000000000000100 RSI: 0000000000000201 RDI: ffffffff8af116bf
RBP: ffffc90000007910 R08: ffffc90000007aa7 R09: 0000000000000000
R10: ffffc90000007a60 R11: fffff52000000f55 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff8af116bf R15: ffff88811b617b00
FS:  00007f389566e6c0(0000) GS:ffff88818e328000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8703f3b000 CR3: 000000011b67a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 _raw_spin_lock_bh+0x1c/0x50
 ieee80211_rx_handlers+0xff/0xba20
 ieee80211_prepare_and_rx_handle+0x25a1/0x67e0
 ieee80211_rx_list+0x266e/0x3050
 ieee80211_rx_napi+0x1b1/0x3e0
 ieee80211_handle_queued_frames+0xe8/0x1e0
 tasklet_action_common+0x2da/0x4b0
 handle_softirqs+0x22a/0x7c0
 __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:preempt_schedule_irq+0x48/0xa0
Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 83 f2 17 f6 e8 9e 7a 50 f6 fb bf 01 00 00 00 <e8> e3 a9 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 24 7c 50 f6 bf 01
RSP: 0018:ffffc9000246f2d0 EFLAGS: 00000206
RAX: 000000000068dc05 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000006 RSI: ffffffff8dad379b RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff8fced577 R09: 1ffffffff1f9daae
R10: dffffc0000000000 R11: fffffbfff1f9daaf R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
 irqentry_exit+0x597/0x620
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unwind_next_frame+0x73a/0x23c0
Code: 53 16 00 00 0f b7 1e c1 eb 0b 80 e3 01 48 8b 44 24 28 0f b6 04 28 84 c0 4c 8b 7c 24 78 0f 85 5d 16 00 00 48 8b 44 24 18 88 18 <0f> b7 1e 83 e3 0f 83 fb 05 0f 8f 85 00 00 00 83 fb 03 0f 8f 01 01
RSP: 0018:ffffc9000246f3f8 EFLAGS: 00000246
RAX: ffffc9000246f4fd RBX: 0000000000000000 RCX: ffffffff90217460
RDX: ffffffff90bb0390 RSI: ffffffff90bb0394 RDI: ffffffff8be73ea0
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff8e35a3a0
R10: ffffc9000246f518 R11: ffffffff81ae5bd0 R12: ffffffff90bb0395
R13: ffffc9000246f518 R14: ffffc9000246f4c8 R15: ffffc9000246f500
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_node_track_caller_noprof+0x558/0x7f0
 kmemdup_noprof+0x2b/0x70
 neigh_sysctl_register+0xae/0xa90
 addrconf_sysctl_register+0xb3/0x1c0
 ipv6_add_dev+0xd26/0x13a0
 addrconf_notify+0x771/0x1050
 notifier_call_chain+0x19d/0x3a0
 register_netdevice+0x15e8/0x1a90
 ppp_dev_configure+0x8a4/0xb10
 ppp_ioctl+0x6de/0x1ab0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f389479acb9
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:00007f389566e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3894a15fa0 RCX: 00007f389479acb9
RDX: 000000110e22fff6 RSI: 00000000c004743e RDI: 0000000000000008
RBP: 00007f3894808bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3894a16038 R14: 00007f3894a15fa0 R15: 00007ffd9b4570b8
 </TASK>
