lowmem_reserve[]: 0 3505 3505
Normal free:2387080kB min:5580kB low:9168kB high:12756kB active_anon:583364kB inactive_anon:200kB active_file:37660kB inactive_file:41740kB unevictable:0kB writepending:48kB present:4718592kB managed:3589316kB mlocked:0kB slab_reclaimable:19804kB slab_unreclaimable:249312kB kernel_stack:9984kB pagetables:19936kB bounce:0kB free_pcp:488kB local_pcp:192kB free_cma:0kB
INFO: task syz-executor2:23726 blocked for more than 140 seconds.
      Not tainted 4.9.126+ #90
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2   D28832 23726   2091 0x00000004
 ffff8801cbc6c740 ffff8801d628e880 ffff88018fb88580 ffff8801943d0000
 ffff8801db621018 ffff88019076f978 ffffffff8277d952 0000000000000002
 ffff8801cbc6cff0 ffffed003978d9fd 00ff8801cbc6c740 ffff8801db6218f0
Call Trace:
 [<ffffffff8277ee7f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff8277f803>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff82781486>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff82781486>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff819c5bda>] sel_write_load+0xba/0xfa0 security/selinux/selinuxfs.c:498
 [<ffffffff814e8a35>] __vfs_write+0x115/0x580 fs/read_write.c:507
 [<ffffffff814eb547>] vfs_write+0x187/0x520 fs/read_write.c:557
 [<ffffffff814ef379>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff814ef379>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff8100554f>] do_syscall_64+0x19f/0x480 arch/x86/entry/common.c:282
 [<ffffffff8278ca53>] 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: [<ffffffff81309d0c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81309d0c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813e6e4c>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/1893:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8154c66c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/2020:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff8278ab22>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81cdd9a2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
3 locks held by syz-executor2/23726:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8154c66c>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff814eb7ab>] file_start_write include/linux/fs.h:2640 [inline]
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff814eb7ab>] vfs_write+0x3eb/0x520 fs/read_write.c:556
 #2:  (sel_mutex){+.+.+.}, at: [<ffffffff819c5bda>] sel_write_load+0xba/0xfa0 security/selinux/selinuxfs.c:498

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.126+ #90
 ffff8801d9907d08 ffffffff81af1049 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810967d0 ffff8801d9907d40
 ffffffff81afbda9 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81af1049>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81af1049>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81afbda9>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81afbd3c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff810968d4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8130a29d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8130a29d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8130a29d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8130a29d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff8113dc9d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8278cc1c>] 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: 14028 Comm: syz-executor0 Not tainted 4.9.126+ #90
task: ffff8801943d0000 task.stack: ffff8801c54d0000
RIP: 0010:[<ffffffff811f823b>] 
c [<ffffffff811f823b>] arch_local_save_flags arch/x86/include/asm/paravirt.h:763 [inline]
RIP: 0010:[<ffffffff811f823b>] 
c [<ffffffff811f823b>] trace_hardirqs_off_caller+0xdb/0x280 kernel/locking/lockdep.c:2763
RSP: 0018:ffff8801c54d7f78  EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffff8801943d0000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: 0000000000000000 RDI: ffffffff83fe9840
RBP: ffff8801c54d7f98 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: ffff8801943d0000
R13: ffffffff8278ca0d R14: 00007f56ab3829c0 R15: 0000000000000000
FS:  00007f56ab382700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3c5dc50000 CR3: 00000001c8917000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000046
c 00000000009300a8
c 00000000009300ac
c 0000000000a3fb9f
c
 ffff8801c54d7ff0
c ffffffff81002286
c 0000000000000246
c 0000000000000000
c
 0000000000000000
c 0000000000000000
c 00000000000000ca
c 00000000004572d9
c
Call Trace:
 [<ffffffff81002286>] trace_hardirqs_off_thunk+0x1a/0x1c
 [<ffffffff8278ca0d>] entry_SYSCALL_64_after_swapgs+0x17/0xdb
Code: 
c48 
c89 
cfa 
c48 
cc1 
cea 
c03 
c0f 
cb6 
c14 
c02 
c48 
c89 
cf8 
c83 
ce0 
c07 
c83 
cc0 
c03 
c38 
cd0 
c7c 
c08 
c84 
cd2 
c0f 
c85 
c66 
c01 
c00 
c00 
c8b 
c0d 
c0a 
c16 
cdf 
c02 
c85 
cc9 
c75 
c10 
c9c 
c<58> 
c0f 
c1f 
c44 
c00 
c00 
cf6 
cc4 
c02 
c0f 
c85 
ce1 
c00 
c00 
c00 
c48 
c8d 
cbb 
c78 
c08 
c00 
c