INFO: task syz.3.4791:18416 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.4791      state:D stack:25640 pid:18416 tgid:18416 ppid:6138   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d4/0x5820
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7c1/0x1550
 ima_file_free+0x18a/0x5d0
 security_file_release+0x85/0x110
 __fput+0x380/0xa50
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0x204/0x770
 do_syscall_64+0x328/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9b54b9e159
RSP: 002b:00007fffe79a5268 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f9b54e27da0 RCX: 00007f9b54b9e159
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f9b54e27da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f9b54e27cb0 R11: 0000000000000246 R12: 0000000000090feb
R13: 00007f9b54e2609c R14: 0000000000090d35 R15: 00007f9b54e26090
 </TASK>

Showing all locks held in the system:
locks held by pr/ttyS0/16: 1, last CPU#1:
 #0: ffffffff8ec36278 (console_srcu){....}-{0:0}, at: console_srcu_read_lock+0x30/0x60
locks held by khungtaskd/34: 1, last CPU#1:
 #0: ffffffff8ed5c6a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
locks held by getty/5446: 2, on CPU#0:
 #0: ffff88816e9050a0 (&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/1:8/14396: 3, last CPU#1:
 #0: ffff88810006a140 ((wq_completion)events_freezable){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc900039b7c40 ((work_completion)(&hcd->wakeup_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffff88810f9131d8 (&dev->mutex){....}-{4:4}, at: usb_remote_wakeup+0x23/0x120
locks held by syz.1.4470/17537: 3, on CPU#1:
 #0: ffff888199b584f0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff88816aa02460 (sb_writers#45){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #2: ffffffff8f09ba20 (nfsd_mutex){+.+.}-{4:4}, at: write_threads+0x3b1/0x610
locks held by syz.3.4791/18416: 1, on CPU#1:
 #0: ffff8881aa7929a8 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: ima_file_free+0x18a/0x5d0
locks held by syz.3.4791/18417: 1, last CPU#1:
 #0: ffff8881aa7929a8 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: process_measurement+0x7d0/0x1c10
locks held by syz-executor/18909: 2, on CPU#1:
 #0: ffff88819a0d60e8 (&type->s_umount_key#87){++++}-{4:4}, at: deactivate_super+0xac/0xe0
 #1: ffffffff8f09ba20 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x4e/0xd0
locks held by syz.4.5230/19725: 1, on CPU#1:
 #0: ffff88819a0d60e8 (&type->s_umount_key#87){++++}-{4:4}, at: super_lock+0x2d6/0x3d0

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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: 0 Comm: swapper/0 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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: 8c 92 02 c3 cc cc cc cc 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 d3 c0 27 00 fb f4 <e9> 4c 0b 03 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8ea07ca0 EFLAGS: 00000202
RAX: 00000000006ae3fb RBX: ffffffff819b9c40 RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8e4732d7 RDI: ffffffff8c6d6d80
RBP: ffffffff8ea07d78 R08: ffff888121033a1b R09: 1ffff11024206743
R10: dffffc0000000000 R11: ffffed1024206744 R12: 0000000000000000
R13: 1ffffffff1d51df0 R14: 1ffffffff1d40f9c R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88818d6e4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3899a6b440 CR3: 000000000eb48000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 default_idle+0x9/0x20
 default_idle_call+0x72/0xb0
 do_idle+0x2e0/0x540
 cpu_startup_entry+0x43/0x60
 rest_init+0x378/0x3a0
 start_kernel+0x392/0x3e0
 x86_64_start_reservations+0x24/0x30
 x86_64_start_kernel+0x137/0x1b0
 common_startup_64+0x13e/0x157
 </TASK>
