audit: type=1400 audit(1555864194.067:5): avc:  denied  { associate } for  pid=2192 comm="syz-executor.0" name="syz0" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1
INFO: task syz-executor.1:3220 blocked for more than 140 seconds.
      Not tainted 4.9.170+ #45
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D28976  3220   2197 0x80000000
 ffff8801c22097c0 ffff8801cc224d00 ffff8801db721000 ffff8801ca4817c0
 ffff8801db721018 ffff8801c221fba0 ffffffff8280185e 0000000041b58ab3
 ffff8801c22097c0 00ff8801c221faf0 ffff8801db7218f0 1ffff10038443f63
Call Trace:
 [<00000000fbab91a4>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
 [<00000000de965f82>] rwsem_down_read_failed+0x258/0x3e0 kernel/locking/rwsem-xadd.c:267
 [<0000000012f8ca16>] call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 [<00000000a106361f>] __down_read arch/x86/include/asm/rwsem.h:65 [inline]
 [<00000000a106361f>] down_read+0x52/0xb0 kernel/locking/rwsem.c:24
 [<00000000b193f95f>] exit_mm kernel/exit.c:480 [inline]
 [<00000000b193f95f>] do_exit+0x3b7/0x2aa0 kernel/exit.c:828
 [<00000000a099079d>] do_group_exit+0x111/0x300 kernel/exit.c:945
 [<000000009d297b84>] SYSC_exit_group kernel/exit.c:956 [inline]
 [<000000009d297b84>] SyS_exit_group+0x1d/0x20 kernel/exit.c:954
 [<00000000c716f72c>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
 [<000000006e0be097>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<000000000f73e8f2>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline]
 #0:  (rcu_read_lock){......}, at: [<000000000f73e8f2>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263
 #1:  (tasklist_lock){.+.+..}, at: [<00000000a5b69982>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339
2 locks held by getty/2042:
 #0:  (&tty->ldisc_sem){++++++}, at: [<0000000065efb59c>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<000000009d931d7f>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
1 lock held by syz-executor.1/3220:
 #0:  (&mm->mmap_sem){++++++}, at: [<00000000b193f95f>] exit_mm kernel/exit.c:480 [inline]
 #0:  (&mm->mmap_sem){++++++}, at: [<00000000b193f95f>] do_exit+0x3b7/0x2aa0 kernel/exit.c:828
1 lock held by syz-executor.1/3226:
 #0:  (&mm->mmap_sem){++++++}, at: [<00000000b193f95f>] exit_mm kernel/exit.c:480 [inline]
 #0:  (&mm->mmap_sem){++++++}, at: [<00000000b193f95f>] do_exit+0x3b7/0x2aa0 kernel/exit.c:828

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.170+ #45
 ffff8801d98d7cc8 ffffffff81b4fb21 0000000000000001 0000000000000000
 0000000000000001 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00
 ffffffff81b5adbc 0000000000000001 0000000000000000 0000000000000001
Call Trace:
 [<000000003c82f97f>] __dump_stack lib/dump_stack.c:15 [inline]
 [<000000003c82f97f>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<000000007549d5c9>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
 [<0000000023cfd08f>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
 [<000000003cda3f0c>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<0000000018ebdc30>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<0000000018ebdc30>] check_hung_task kernel/hung_task.c:126 [inline]
 [<0000000018ebdc30>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline]
 [<0000000018ebdc30>] watchdog+0x670/0xaf0 kernel/hung_task.c:263
 [<0000000091e02785>] kthread+0x278/0x310 kernel/kthread.c:211
 [<00000000b86ff3e7>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3234 Comm: syz-executor.1 Not tainted 4.9.170+ #45
task: 000000005ecc2b47 task.stack: 0000000059b3f9b4
RIP: 0010:[<ffffffff8124452a>] 
c [<00000000c629874f>] debug_lockdep_rcu_enabled.part.0+0x2a/0x60 kernel/rcu/update.c:265
RSP: 0018:ffff8801d1b67a98  EFLAGS: 00000a03
RAX: dffffc0000000000 RBX: ffff8801d0a297c0 RCX: 1ffffffff063f7a4
RDX: 0000000000000000 RSI: 000000000000026c RDI: ffff8801d0a2a06c
RBP: ffff8801d1b67aa0 R08: 0000000000000000 R09: ffff8801d0a2a090
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82a50b20
R13: 000000000000026c R14: 0000000000000000 R15: ffff8801d2622d60
FS:  00007ff3d7100700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002572308 CR3: 00000001d18f9000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000000
c ffff8801d1b67ab0
c ffffffff812445d1
c ffff8801d1b67ae8
c
 ffffffff81166eea
c ffff8801d0a297c0
c ffffffff82a50b20
c 000000000000026c
c
 0000000000000000
c ffff8801d2622d60
c ffff8801d1b67b28
c ffffffff811671e5
c
Call Trace:
 [<0000000071df10a9>] debug_lockdep_rcu_enabled+0x71/0xa0 kernel/rcu/update.c:264
 [<00000000f8d4f8f6>] ___might_sleep+0x1a/0x280 kernel/sched/core.c:7951
 [<0000000034d046ba>] __might_sleep+0x95/0x1a0 kernel/sched/core.c:7942
 [<000000005c179460>] mutex_lock_nested+0x87/0x920 kernel/locking/mutex.c:620
 [<00000000bdb067fe>] perf_mmap+0x4d9/0x1580 kernel/events/core.c:5278
 [<00000000c44447b7>] mmap_region+0x7e7/0xfa0 mm/mmap.c:1726
 [<00000000ddeeb210>] do_mmap+0x539/0xbc0 mm/mmap.c:1505
 [<000000005da31dc1>] do_mmap_pgoff include/linux/mm.h:2034 [inline]
 [<000000005da31dc1>] vm_mmap_pgoff+0x179/0x1c0 mm/util.c:329
 [<000000005658d19b>] SYSC_mmap_pgoff mm/mmap.c:1555 [inline]
 [<000000005658d19b>] SyS_mmap_pgoff+0xfa/0x1b0 mm/mmap.c:1513
 [<00000000fe72c21e>] SYSC_mmap arch/x86/kernel/sys_x86_64.c:96 [inline]
 [<00000000fe72c21e>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:87
 [<00000000c716f72c>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
 [<000000006e0be097>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c