INFO: task syz.0.47:6190 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.47        state:D stack:27384 pid:6190  tgid:6178  ppid:5829   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x149b/0x4fd0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x872/0xfe0
 down_write+0x1ab/0x1f0
 process_measurement+0x3d8/0x1a70
 ima_file_check+0xd9/0x130
 security_file_post_open+0xbb/0x290
 path_openat+0x3456/0x3dd0
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xec/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1313f8f7c9
RSP: 002b:00007f1314eca038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f13141e6090 RCX: 00007f1313f8f7c9
RDX: 0000000000000042 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007f1313ff297f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000020 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f13141e6128 R14: 00007f13141e6090 R15: 00007ffe5f750c28
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_exp_gp_kthr/18:
 #0: ffff88823c63a918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
1 lock held by ksoftirqd/1/23:
3 locks held by kworker/1:0/24:
1 lock held by khungtaskd/35:
 #0: ffffffff8df41a20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/1:2/62:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770
 #1: ffffc9000158fbc0 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770
 #2: ffffffff8f311c48 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20
2 locks held by getty/5645:
 #0: ffff88810fa8e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x449/0x1460
2 locks held by syz.0.47/6179:
1 lock held by syz.0.47/6190:
 #0: ffff8881159abdd8 (&sb->s_type->i_mutex_key#34){+.+.}-{4:4}, at: process_measurement+0x3d8/0x1a70
4 locks held by kworker/u8:5/7782:
 #0: ffff888100ef7948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770
 #1: ffffc90003f57bc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770
 #2: ffffffff8f304bb0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf7/0x7a0
 #3: ffffffff8f311c48 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x990
3 locks held by kworker/0:10/8892:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770
 #1: ffffc90003d37bc0 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770
 #2: ffffffff8df47578 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x36e/0x6e0
1 lock held by syz-executor/9292:
 #0: ffffffff8df47578 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x36e/0x6e0
1 lock held by syz.0.528/9900:
2 locks held by syz-executor/9902:
 #0: ffffffff8f304bb0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x3cc/0x570
 #1: ffffffff8f311c48 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x990
2 locks held by dhcpcd-run-hook/9908:

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

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/0x300
 sys_info+0x135/0x170
 watchdog+0xf95/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x510/0xa50
 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: 7782 Comm: kworker/u8:5 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: netns cleanup_net
RIP: 0010:serial8250_console_write+0x165e/0x1b60
Code: 18 09 a7 fc 49 bd 00 00 00 00 00 fc ff df e9 1d fb ff ff e8 04 09 a7 fc e9 0e ed ff ff e8 fa 08 a7 fc c7 44 24 14 00 00 00 00 <49> bd 00 00 00 00 00 fc ff df 4c 8b 7c 24 08 4c 8b 64 24 20 e9 95
RSP: 0018:ffffc90003f570c0 EFLAGS: 00000093
RAX: ffffffff8519dc08 RBX: 1ffffffff3381074 RCX: ffff88817501ba80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003f57230 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520007eae04 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff99c083a0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8882a9e21000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555c36d27131 CR3: 0000000113a08000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 console_flush_all+0x713/0xb00
 console_unlock+0xbb/0x190
 vprintk_emit+0x47b/0x550
 _printk+0xcf/0x120
 netdev_info+0x10a/0x160
 __dev_set_promiscuity+0x2e7/0x710
 netif_set_promiscuity+0x50/0xe0
 dev_set_promiscuity+0x126/0x260
 del_nbp+0x12c/0xa60
 br_dev_delete+0x6e/0x110
 br_net_exit_rtnl+0xb1/0x120
 ops_undo_list+0x350/0x990
 cleanup_net+0x4d8/0x7a0
 process_scheduled_works+0xad1/0x1770
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x510/0xa50
 ret_from_fork_asm+0x1a/0x30
 </TASK>
