INFO: task kworker/0:3:5681 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:3     state:D stack:22368 pid:5681  tgid:5681  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events ovs_dp_masks_rebalance
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7f7/0x1550
 ovs_dp_masks_rebalance+0x2f/0xe0
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x389/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task kworker/0:0:8475 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:0     state:D stack:22008 pid:8475  tgid:8475  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events ovs_dp_masks_rebalance
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7f7/0x1550
 ovs_dp_masks_rebalance+0x2f/0xe0
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x389/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task kworker/0:2:8478 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:2     state:D stack:25848 pid:8478  tgid:8478  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events ovs_dp_masks_rebalance
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7f7/0x1550
 ovs_dp_masks_rebalance+0x2f/0xe0
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x389/0x470
 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:
2 locks held by kthreadd/2:
4 locks held by kworker/u8:0/12:
4 locks held by kworker/u8:1/13:
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by jbd2/sda1-8/5022:
3 locks held by klogd/5049:
4 locks held by udevd/5060:
2 locks held by dhcpcd/5356:
3 locks held by dhcpcd/5358:
2 locks held by getty/5443:
 #0: ffff8881769910a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
2 locks held by sshd/5540:
3 locks held by syz-executor/5608:
3 locks held by syz-executor/5610:
3 locks held by syz-executor/5611:
1 lock held by syz-executor/5621:
5 locks held by kworker/u8:2/5646:
3 locks held by kworker/0:3/5681:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc900051efc40 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffffffff901418e0 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x2f/0xe0
3 locks held by kworker/1:18/6892:
3 locks held by kworker/0:0/8475:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc90008e9fc40 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffffffff901418e0 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x2f/0xe0
3 locks held by kworker/0:2/8478:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc90008e0fc40 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffffffff901418e0 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x2f/0xe0
3 locks held by kworker/u8:4/10213:
 #0: ffff888171a47140 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc90028d5fc40 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffffffff8fdd2400 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30
5 locks held by kworker/0:4/22516:
4 locks held by syz.0.12413/24543:

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

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+0xfd3/0x1030
 kthread+0x389/0x470
 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: 1 Comm: init 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:folio_mapping+0xf5/0x1f0
Code: 00 75 07 e8 1d 70 b6 ff eb 69 43 80 3c 3c 00 74 08 4c 89 f7 e8 6c b0 21 00 4d 8b 36 4c 89 f6 48 83 e6 01 31 ff e8 db 74 b6 ff <49> 83 e6 01 0f 85 cf 00 00 00 48 89 df be 08 00 00 00 e8 b4 b2 21
RSP: 0018:ffffc90000066148 EFLAGS: 00000293
RAX: ffffffff820f54c5 RBX: ffffea00068bc300 RCX: ffff8881026f5880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000020000 R08: ffffea00068bc307 R09: 1ffffd4000d17860
R10: dffffc0000000000 R11: fffff94000d17861 R12: 1ffffd4000d17861
R13: 1ffffd4000d17860 R14: dead000000000100 R15: dffffc0000000000
FS:  00007fba09ac5380(0000) GS:ffff88818dc76000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff94d3ea540 CR3: 0000000170e76000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 shrink_folio_list+0x21d1/0x52a0
 evict_folios+0x4998/0x5ac0
 try_to_shrink_lruvec+0xbca/0x1050
 shrink_one+0x25c/0x710
 shrink_node+0x31bf/0x3ae0
 do_try_to_free_pages+0x6a2/0x1990
 try_to_free_pages+0x8f2/0xe30
 __alloc_pages_direct_reclaim+0x148/0x310
 __alloc_pages_slowpath+0x57d/0xd40
 __alloc_frozen_pages_noprof+0x322/0x380
 alloc_pages_mpol+0x235/0x490
 folio_alloc_mpol_noprof+0x39/0x160
 swap_cache_alloc_folio+0xd5/0x240
 swap_cluster_readahead+0x523/0x670
 swapin_readahead+0x196/0xc50
 do_swap_page+0x555/0x5120
 handle_mm_fault+0x12d4/0x3170
 do_user_addr_fault+0x75b/0x1340
 exc_page_fault+0x6a/0xc0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:__rseq_handle_slowpath+0x2b1/0x6a0
Code: ff 45 39 e5 0f 85 3a 01 00 00 e8 4a 31 c4 ff 49 bd 00 00 00 00 00 fc ff df eb 0f e8 39 31 c4 ff e9 ed 00 00 00 e8 2f 31 c4 ff <45> 89 3e 45 89 7e 04 8b 44 24 04 41 89 46 14 41 89 6e 18 4d 8b 66
RSP: 0018:ffffc90000067e58 EFLAGS: 00010293
RAX: ffffffff82019391 RBX: ffff8881026f5880 RCX: ffff8881026f5880
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff903135f7 R09: 1ffffffff20626be
R10: dffffc0000000000 R11: fffffbfff20626bf R12: 0000000000000001
R13: dffffc0000000000 R14: 00007fba09ac5d20 R15: 0000000000000001
 exit_to_user_mode_loop+0xd6/0x4d0
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fba09b8a23c
Code: Unable to access opcode bytes at 0x7fba09b8a212.
RSP: 002b:00007ffddef1e2d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000080
RAX: 0000000000000011 RBX: 00007fba09dc013c RCX: 00007fba09b8a23c
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fba09dc54a8
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffddef1e338 R14: 000055c3a3976169 R15: 00007fba09dfea80
 </TASK>
