INFO: task kworker/u4:0:7 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.0'.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:0    D25128     7      2 0x80000000
PF_BRIDGE: br_mdb_parse() with invalid ifindex
Workqueue: netns cleanup_net
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
PF_BRIDGE: br_mdb_parse() with invalid ifindex
 schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1794
 do_wait_for_common kernel/sched/completion.c:83 [inline]
 __wait_for_common kernel/sched/completion.c:104 [inline]
 wait_for_common+0x29c/0x470 kernel/sched/completion.c:115
 flush_workqueue+0x40b/0x13e0 kernel/workqueue.c:2713
 flush_scheduled_work include/linux/workqueue.h:599 [inline]
 tipc_exit_net+0x38/0x60 net/tipc/core.c:100
 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:153
 cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:554
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Showing all locks held in the system:
3 locks held by kworker/u4:0/7:
 #0: 00000000ba37413c ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124
 #1: 000000002e9578c7 (net_cleanup_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128
 #2: 00000000ddb09105 (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:521
1 lock held by khungtaskd/1570:
 #0: 00000000b3e576fa (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441
2 locks held by kworker/1:2/4789:
 #0: 00000000ad8dbc34 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124
 #1: 00000000c4a940a7 ((work_completion)(&m->rq)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128
1 lock held by kworker/u4:3/12406:
 #0: 00000000dca56b49 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline]
 #0: 00000000dca56b49 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
3 locks held by kworker/u4:5/12873:
2 locks held by kworker/0:1/22814:
 #0: 000000000e0bf161 ((wq_completion)"rcu_gp"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124
 #1: 00000000803ba0ea ((work_completion)(&rew.rew_work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128
2 locks held by syz-executor.5/26668:
 #0: 00000000a8e166ba (&sb->s_type->i_mutex_key#13){+.+.}, at: inode_lock include/linux/fs.h:748 [inline]
 #0: 00000000a8e166ba (&sb->s_type->i_mutex_key#13){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:598
 #1: 000000004f61ce7d (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline]
 #1: 000000004f61ce7d (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x256/0x6f0 kernel/rcu/tree_exp.h:667
2 locks held by syz-executor.4/26669:
 #0: 000000005adc1856 (&sb->s_type->i_mutex_key#13){+.+.}, at: inode_lock include/linux/fs.h:748 [inline]
 #0: 000000005adc1856 (&sb->s_type->i_mutex_key#13){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:598
 #1: 000000004f61ce7d (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline]
 #1: 000000004f61ce7d (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x256/0x6f0 kernel/rcu/tree_exp.h:667
3 locks held by syz-executor.2/26699:
3 locks held by syz-executor.0/26705:
1 lock held by syz-executor.1/26706:
 #0: 000000005466b869 (&runtime->oss.params_lock){+.+.}, at: snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1400 [inline]
 #0: 000000005466b869 (&runtime->oss.params_lock){+.+.}, at: snd_pcm_oss_write+0x380/0x910 sound/core/oss/pcm_oss.c:2786

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

NMI backtrace for cpu 0
CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
 watchdog+0x991/0xe60 kernel/hung_task.c:287
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4695 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:784 [inline]
RIP: 0010:check_preemption_disabled+0x4f/0x280 lib/smp_processor_id.c:18
Code: e3 ff ff ff 7f 31 ff 89 de e8 bd 68 eb fd 85 db 74 18 e8 44 67 eb fd e8 3f 67 eb fd 44 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 <e8> 2c 67 eb fd 48 c7 c0 80 82 f1 89 48 ba 00 00 00 00 00 fc ff df
RSP: 0018:ffff8880a093f8e8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff83771e23
RDX: 0000000000000000 RSI: ffff8880a0936640 RDI: 0000000000000005
RBP: ffffffff88b3e160 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff8871ebe0 R14: ffff88813fffb6c0 R15: 000000000002ea68
FS:  00007fe241bab8c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9bdc495718 CR3: 00000000a0c22000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __mod_zone_page_state+0x5f/0xf0 mm/vmstat.c:325
 __mod_zone_freepage_state include/linux/vmstat.h:382 [inline]
 rmqueue mm/page_alloc.c:3039 [inline]
 get_page_from_freelist+0x254b/0x4170 mm/page_alloc.c:3373
 __alloc_pages_nodemask+0x387/0x2890 mm/page_alloc.c:4399
 __alloc_pages include/linux/gfp.h:496 [inline]
 __alloc_pages_node include/linux/gfp.h:509 [inline]
 kmem_getpages mm/slab.c:1412 [inline]
 cache_grow_begin+0xa4/0x8a0 mm/slab.c:2682
 cache_alloc_refill+0x273/0x340 mm/slab.c:3049
 ____cache_alloc mm/slab.c:3132 [inline]
 __do_cache_alloc mm/slab.c:3354 [inline]
 slab_alloc mm/slab.c:3389 [inline]
 kmem_cache_alloc+0x346/0x370 mm/slab.c:3557
 getname_flags+0xce/0x590 fs/namei.c:140
 getname fs/namei.c:211 [inline]
 user_path_create fs/namei.c:3696 [inline]
 do_mkdirat+0x8d/0x2d0 fs/namei.c:3834
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fe240e66687
Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007ffe1413c278 EFLAGS: 00000293 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007ffe1413f2e0 RCX: 00007fe240e66687
RDX: 0000000000000000 RSI: 00000000000001ed RDI: 000055a307f4c8a0
RBP: 00007ffe1413c2b0 R08: 000055a3073003e5 R09: 0000000000000018
R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 000055a307f4c8a0 R15: 00007ffe1413c8f0
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.0'.