INFO: task kworker/1:3:5666 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:3     state:D stack:22944 pid:5666  tgid:5666  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events ovs_dp_masks_rebalance
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 ovs_dp_masks_rebalance+0x2f/0xe0
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task kworker/0:6:5719 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:6     state:D stack:25408 pid:5719  tgid:5719  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events ovs_dp_masks_rebalance
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 ovs_dp_masks_rebalance+0x2f/0xe0
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task kworker/0:2:20405 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:2     state:D stack:24424 pid:20405 tgid:20405 ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events ovs_dp_masks_rebalance
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 ovs_dp_masks_rebalance+0x2f/0xe0
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Showing all locks held in the system:
2 locks held by init/1:
 #0: ffff888174440518 (mapping.invalidate_lock#2){++++}-{4:4}, at: page_cache_ra_order+0xb37/0xee0
 #1: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
2 locks held by kthreadd/2:
 #0: ffffffff8ea848a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310
 #1: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
5 locks held by kworker/u8:0/12:
 #0: ffff88802992f940 ((wq_completion)krds_cp_wq#21/0){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90000117c40 ((work_completion)(&(&cp->cp_conn_w)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffff88801b5f1b80 (&tc->t_conn_path_lock){+.+.}-{4:4}, at: rds_tcp_conn_path_connect+0x1cc/0x920
 #3: ffffffff8ea848a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310
 #4: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
3 locks held by kworker/1:1/31:
 #0: ffff888100069940 ((wq_completion)events_freezable_pwr_efficient){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90000a67c40 ((work_completion)(&(&ev->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
1 lock held by khungtaskd/35:
 #0: ffffffff8e959c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by jbd2/sda1-8/5021:
 #0: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
3 locks held by klogd/5048:
 #0: ffff888174440518 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_fault+0xa55/0x13b0
 #1: ffffffff8ea848a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310
 #2: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
3 locks held by udevd/5059:
 #0: ffff8881147fb6b8 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x36/0x340
 #1: ffffffff8ea848a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310
 #2: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
2 locks held by dhcpcd/5354:
 #0: ffff888116c217d8 (mapping.invalidate_lock#2){++++}-{4:4}, at: page_cache_ra_order+0xb37/0xee0
 #1: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
2 locks held by getty/5440:
 #0: ffff88811322d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
3 locks held by sshd/5592:
 #0: ffff8881740d5cf8 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x36/0x340
 #1: ffffffff8ea848a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310
 #2: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
4 locks held by syz-executor/5608:
 #0: ffff8881bedb3268 (&tsk->futex.exit_mutex){+.+.}-{4:4}, at: futex_exit_release+0x33/0x1d0
 #1: ffff88810a381d38 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x36/0x340
 #2: ffffffff8ea848a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310
 #3: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
4 locks held by syz-executor/5610:
 #0: ffff8881bc5f6de8 (&tsk->futex.exit_mutex){+.+.}-{4:4}, at: futex_exit_release+0x33/0x1d0
 #1: ffff888112e3c378 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x36/0x340
 #2: ffffffff8ea848a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310
 #3: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
3 locks held by syz-executor/5615:
 #0: ffff888116c36c38 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_fault+0xa55/0x13b0
 #1: ffffffff8ea848a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310
 #2: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
3 locks held by syz-executor/5619:
 #0: ffff888169d9c0b8 (&hdev->lock){+.+.}-{4:4}, at: hci_unregister_dev+0x2ff/0x5b0
 #1: ffffffff8ea848a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310
 #2: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
3 locks held by kworker/1:3/5666:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90004697c40 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9015c8e0 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x2f/0xe0
5 locks held by kworker/0:5/5674:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90004707c40 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9015c8e0 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x2f/0xe0
 #3: ffffffff8ea848a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310
 #4: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
3 locks held by kworker/0:6/5719:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90004acfc40 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9015c8e0 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x2f/0xe0
5 locks held by kworker/u8:4/7336:
 #0: ffff8881991ae940 ((wq_completion)krds_cp_wq#11/0){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc900041f7c40 ((work_completion)(&(&cp->cp_conn_w)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffff8881aa235280 (&tc->t_conn_path_lock){+.+.}-{4:4}, at: rds_tcp_conn_path_connect+0x1cc/0x920
 #3: ffffffff8ea848a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310
 #4: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
5 locks held by kworker/u8:5/7337:
 #0: ffff888111434140 ((wq_completion)krds_cp_wq#3/0){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc900041e7c40 ((work_completion)(&(&cp->cp_conn_w)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffff8881114d7980 (&tc->t_conn_path_lock){+.+.}-{4:4}, at: rds_tcp_conn_path_connect+0x1cc/0x920
 #3: ffffffff8ea848a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310
 #4: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
3 locks held by kworker/1:13/10188:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc9000341fc40 (drain_vmap_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: drain_vmap_area_work+0x17/0x40
5 locks held by kworker/u8:6/14944:
 #0: ffff8881aa77b140 ((wq_completion)krds_cp_wq#18/0){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc9000366fc40 ((work_completion)(&(&cp->cp_conn_w)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffff88816c0fb980 (&tc->t_conn_path_lock){+.+.}-{4:4}, at: rds_tcp_conn_path_connect+0x1cc/0x920
 #3: ffffffff8ea848a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310
 #4: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
2 locks held by syz-executor/19801:
 #0: ffff88817446e2d8 (mapping.invalidate_lock#2){++++}-{4:4}, at: page_cache_ra_order+0xb37/0xee0
 #1: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
5 locks held by kworker/u8:7/26417:
 #0: ffff888027adb940 ((wq_completion)krds_cp_wq#17/0){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90005b6fc40 ((work_completion)(&(&cp->cp_conn_w)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffff8881114d6180 (&tc->t_conn_path_lock){+.+.}-{4:4}, at: rds_tcp_conn_path_connect+0x1cc/0x920
 #3: ffffffff8ea848a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310
 #4: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
3 locks held by kworker/0:2/20405:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90005997c40 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9015c8e0 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x2f/0xe0
4 locks held by kworker/u9:3/27197:
 #0: ffff8881000aa940 ((wq_completion)kvfree_rcu_reclaim){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90005fafc40 ((work_completion)(&(&krcp->page_cache_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff8ea848a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310
 #3: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90
2 locks held by kworker/u9:5/27199:
 #0: ffff8881000ac140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90005ee7c40 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
3 locks held by syz.1.15540/12752:
 #0: ffff88817446e2d8 (mapping.invalidate_lock#2){++++}-{4:4}, at: page_cache_ra_order+0xb37/0xee0
 #1: ffff88817446dfd8 (&ei->i_data_sem#2){++++}-{4:4}, at: ext4_map_blocks+0x436/0x1240
 #2: ffffffff8ea804c0 (vmap_purge_lock){+.+.}-{4:4}, at: vmap_node_shrink_scan+0x18/0x90

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

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/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 0 Comm: swapper/1 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:pv_native_safe_halt+0xf/0x20
Code: 0c 75 02 e9 13 05 03 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d 53 0a 14 00 fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0000:ffffc90000197e40 EFLAGS: 00000202
RAX: 000000000069d379 RBX: ffffffff819aa450 RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8dfe3d84 RDI: ffffffff8c2ab880
RBP: ffffc90000197f10 R08: ffff88823c6338db R09: 1ffff110478c671b
R10: dffffc0000000000 R11: ffffed10478c671c R12: 0000000000000000
R13: 1ffff1102c09e000 R14: 1ffff92000032fd0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8882a921c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e6b6bb287f CR3: 000000000e746000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 default_idle+0x9/0x20
 default_idle_call+0x72/0xb0
 do_idle+0x2e0/0x540
 cpu_startup_entry+0x43/0x60
 start_secondary+0x101/0x110
 common_startup_64+0x13e/0x157
 </TASK>
