INFO: task kworker/0:3:1287 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:3     state:D stack:22728 pid:1287  tgid:1287  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_power_efficient reg_check_chans_work
Call Trace:
 <TASK>
 __schedule+0x17db/0x58f0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7c1/0x1550
 reg_check_chans_work+0x1a1/0x1110
 process_scheduled_works+0xc3d/0x1630
 worker_thread+0xa47/0xfb0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task kworker/u8:2:5461 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:2    state:D stack:23608 pid:5461  tgid:5461  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: ipv6_addrconf addrconf_verify_work
Call Trace:
 <TASK>
 __schedule+0x17db/0x58f0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7c1/0x1550
 addrconf_verify_work+0x19/0x30
 process_scheduled_works+0xc3d/0x1630
 worker_thread+0xa47/0xfb0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Showing all locks held in the system:
locks held by kworker/u8:0/12: 2, last CPU#0:
 #0: ffff888170a99140 ((wq_completion)bond9){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90000117c40 ((work_completion)(&(&bond->ad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
locks held by kworker/u8:1/13: 4, last CPU#0:
 #0: ffff8881bf143140 ((wq_completion)krds_cp_wq#15/0){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90000127c40 ((work_completion)(&(&cp->cp_conn_w)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffff8881754b6180 (&tc->t_conn_path_lock){+.+.}-{4:4}, at: rds_tcp_conn_path_connect+0x1cc/0x920
 #3: ffffffff8eeac370 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60
locks held by kworker/1:0/25: 3, on CPU#1:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc900001f7c40 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff902527c0 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20
locks held by khungtaskd/34: 1, last CPU#0:
 #0: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
locks held by kworker/0:2/128: 4, last CPU#0:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc9000303fc40 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff905c27e0 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x2f/0xe0
 #3: ffffffff8eeac370 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60
locks held by kworker/0:3/1287: 4, on CPU#0:
 #0: ffff888100069d40 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90006ea7c40 ((reg_check_chans).work){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff902527c0 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0xac/0x1110
 #3: ffff88810c9c07a0 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_check_chans_work+0x1a1/0x1110
locks held by jbd2/sda1-8/5005: 2, last CPU#1:
 #0: ffffffff8eeac370 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60
 #1: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550
locks held by syslogd/5025: 2, last CPU#0:
 #0: ffffffff8eeac370 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60
 #1: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: __update_page_owner_free_handle+0x2e/0x4a0
locks held by udevd/5043: 4, last CPU#1:
 #0: ffffffff8ee36330 (dup_mmap_sem){++++}-{0:0}, at: copy_mm+0x10f/0x480
 #1: ffff88810ffa9078 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x195/0x1dc0
 #2: ffff888173ccdcf8 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x221/0x1dc0
 #3: ffffffff8eeac370 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60
locks held by dhcpcd/5338: 2, last CPU#0:
 #0: ffffffff8f4f0f78 (tomoyo_ss){.+.+}-{0:0}, at: tomoyo_path_number_perm+0x219/0x5f0
 #1: ffffffff8eeac370 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60
locks held by dhcpcd/5339: 1, last CPU#1:
 #0: ffffffff8eeac370 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60
locks held by getty/5420: 2, on CPU#1:
 #0: ffff88810c4c00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034762e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
locks held by kworker/u8:2/5461: 3, on CPU#1:
 #0: ffff888172a8d940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc9000415fc40 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff902527c0 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30
locks held by syz-executor/5597: 1, on CPU#1:
 #0: ffffffff902527c0 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
locks held by syz-executor/5601: 4, last CPU#0:
 #0: ffffffff8ee36330 (dup_mmap_sem){++++}-{0:0}, at: copy_mm+0x10f/0x480
 #1: ffff888116619d38 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x195/0x1dc0
 #2: ffff88816e4f36b8 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x221/0x1dc0
 #3: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550
locks held by syz-executor/5606: 2, last CPU#1:
 #0: ffffffff905fc4c0 (uevent_sock_mutex){+.+.}-{4:4}, at: kobject_uevent_net_broadcast+0x27e/0x560
 #1: ffffffff8eeac370 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60
locks held by kworker/1:4/5665: 2, last CPU#1:
 #0: ffff888100069d40 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90004d37c40 ((work_completion)(&(&tbl->gc_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
locks held by kworker/u10:5/5882: 2, last CPU#1:
 #0: ffff888169491140 ((wq_completion)wg-kex-wg0#5){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90006adfc40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
locks held by kworker/u10:9/5887: 3, last CPU#0:
 #0: ffff8881000ac140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90006b3fc40 ((work_completion)(&rdev->wiphy_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffff88810c9c07a0 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: cfg80211_wiphy_work+0xb4/0x420
locks held by kworker/u10:19/8151: 3, last CPU#0:
 #0: ffff8881000ac140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc9000f0afc40 ((work_completion)(&rdev->wiphy_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffff8881be6707a0 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: cfg80211_wiphy_work+0xb4/0x420
locks held by kworker/0:6/9844: 5, last CPU#0:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90021cefc40 ((work_completion)(&helper->damage_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffc90021cef770 (crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_atomic_helper_dirtyfb+0x106/0xfd0
 #3: ffffc90021cef798 (crtc_ww_class_mutex){+.+.}-{4:4}, at: drm_atomic_helper_dirtyfb+0x106/0xfd0
 #4: ffffffff8eeac370 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60
locks held by kworker/u8:5/10613: 4, last CPU#1:
 #0: ffff88816bdea940 ((wq_completion)krds_cp_wq#4/0){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc9000353fc40 ((work_completion)(&(&cp->cp_conn_w)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffff8881754b7980 (&tc->t_conn_path_lock){+.+.}-{4:4}, at: rds_tcp_conn_path_connect+0x1cc/0x920
 #3: ffff8881b0d4c360 (k-sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sock_set_nodelay+0x2a/0x180
locks held by kworker/u10:31/12156: 3, last CPU#0:
 #0: ffff8881000ac140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90003b9fc40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffff888171618258 (&devlink->lock_key){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x57/0xb40
locks held by kworker/u8:6/16812: 2, last CPU#1:
 #0: ffff888106752940 ((wq_completion)bond22){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90021e27c40 ((work_completion)(&(&bond->ad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
locks held by kworker/u8:8/25113: 2, last CPU#0:
 #0: ffff888172f5b940 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc9000606fc40 ((work_completion)(&(&bat_priv->tt.work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
locks held by kworker/u8:9/25114: 4, last CPU#0:
 #0: ffff888113d42140 ((wq_completion)krds_cp_wq#16/0){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc9000f0dfc40 ((work_completion)(&(&cp->cp_conn_w)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffff888113a7b980 (&tc->t_conn_path_lock){+.+.}-{4:4}, at: rds_tcp_conn_path_connect+0x1cc/0x920
 #3: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550
locks held by kworker/u8:10/25116: 4, last CPU#1:
 #0: ffff8881148d5940 ((wq_completion)krds_cp_wq#2/0){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc9000ef3fc40 ((work_completion)(&(&cp->cp_conn_w)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffff888170f0d280 (&tc->t_conn_path_lock){+.+.}-{4:4}, at: rds_tcp_conn_path_connect+0x1cc/0x920
 #3: ffff8881b0d4dd60 (k-sk_lock-AF_INET){+.+.}-{0:0}, at: rds_tcp_tune+0x220/0x920
locks held by kworker/u8:11/25117: 4, last CPU#0:
 #0: ffff8881140ca940 ((wq_completion)krds_cp_wq#6/0){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc9000f03fc40 ((work_completion)(&(&cp->cp_conn_w)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffff88811cc01280 (&tc->t_conn_path_lock){+.+.}-{4:4}, at: rds_tcp_conn_path_connect+0x1cc/0x920
 #3: ffff888115223660 (k-sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sock_set_nodelay+0x2a/0x180
locks held by kworker/1:3/25119: 3, last CPU#1:
 #0: ffff888100069d40 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc9000f0efc40 ((work_completion)(&(&gc_work->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: gc_worker+0x274/0x1890
locks held by syz-executor/25122: 2, last CPU#0:
 #0: ffff88816e4f69b8 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1dd/0x4e0
 #1: ffffffff8eeac370 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60
locks held by kworker/u8:13/25123: 2, last CPU#0:
 #0: ffff8881bd230140 ((wq_completion)bond3#3){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc9000f13fc40 ((work_completion)(&(&bond->ad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
locks held by dhcpcd/25124: 1, last CPU#0:
 #0: ffffffff8eeac370 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60

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

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+0x17d/0x390
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 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: 25113 Comm: kworker/u8:8 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
Workqueue: bat_events batadv_tt_purge
RIP: 0010:check_preemption_disabled+0x1e/0xd0
Code: 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 53 65 8b 05 db bd af 07 65 48 8b 0d ab bd af 07 85 c9 74 0c 5b 41 5e 41 5f <5d> c3 cc cc cc cc cc 9c 59 f7 c1 00 02 00 00 74 ea 65 4c 8b 3d 81
RSP: 0018:ffffc90000006e28 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000206 RCX: 8000000000000101
RDX: ffffc90000006f01 RSI: ffffffff8e6ff3f4 RDI: ffffffff8c6d9c80
RBP: ffff8881a1658c28 R08: ffffc90000007070 R09: 0000000000000000
R10: ffffc90000006f98 R11: fffff52000000df5 R12: 0000000000000003
R13: 0000000000000003 R14: ffffffff8ed5c8a0 R15: ffff8881a1658000
FS:  0000000000000000(0000) GS:ffff88818d6d1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005628c63e4020 CR3: 0000000174400000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lock_release+0x263/0x3c0
 unwind_next_frame+0x1baa/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x2b9/0x600
 skb_clone+0x212/0x3a0
 br_flood+0x613/0x8d0
 br_handle_frame_finish+0x1119/0x1950
 br_nf_hook_thresh+0x3dd/0x4c0
 br_nf_pre_routing_finish_ipv6+0x90c/0xc40
 br_nf_pre_routing_ipv6+0x382/0x6f0
 br_handle_frame+0x1329/0x1600
 __netif_receive_skb_core+0x989/0x30c0
 process_backlog+0x727/0x18b0
 __napi_poll+0xaa/0x330
 net_rx_action+0x61d/0xf50
 handle_softirqs+0x226/0x860
 do_softirq+0x77/0xd0
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x140
 batadv_tt_local_purge+0x2c1/0x340
 batadv_tt_purge+0x35/0xa10
 process_scheduled_works+0xc3d/0x1630
 worker_thread+0xa47/0xfb0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
