Free swap  = 0kB
Total swap = 0kB
1965979 pages RAM
0 pages HighMem/MovableOnly
313617 pages reserved
INFO: task syz-executor864:5578 blocked for more than 140 seconds.
      Not tainted 4.9.141+ #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor864 D29672  5578   2226 0x00000004
 ffff8801c53a5f00 ffff8801c68f4200 ffff8801c68f4200 ffff8801d8c78000
 ffff8801db621018 ffff8801d849fa08 ffffffff828075c2 0000000000000000
 ffff8801c53a67b0 ffffed0038a74cf5 00ff8801c53a5f00 ffff8801db6218f0
Call Trace:
 [<ffffffff82808aef>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff828094a3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff8280b51d>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8280b51d>] mutex_lock_nested+0x38d/0x900 kernel/locking/mutex.c:621
 [<ffffffff81524a93>] pipe_lock_nested fs/pipe.c:66 [inline]
 [<ffffffff81524a93>] pipe_lock fs/pipe.c:74 [inline]
 [<ffffffff81524a93>] pipe_wait+0x1a3/0x1d0 fs/pipe.c:122
 [<ffffffff815250e7>] pipe_write+0x4e7/0xd50 fs/pipe.c:475
 [<ffffffff81508347>] new_sync_write fs/read_write.c:496 [inline]
 [<ffffffff81508347>] __vfs_write+0x3d7/0x580 fs/read_write.c:509
 [<ffffffff8150ab97>] vfs_write+0x187/0x520 fs/read_write.c:557
 [<ffffffff8150e9c9>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff8150e9c9>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82817893>] 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: [<ffffffff8131c0cc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c0cc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813fe63f>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/1902:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8156cc7c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/2029:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82815952>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d37362>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor864/5578:
 #0:  (&pipe->mutex/1){+.+.+.}, at: [<ffffffff81524a93>] pipe_lock_nested fs/pipe.c:66 [inline]
 #0:  (&pipe->mutex/1){+.+.+.}, at: [<ffffffff81524a93>] pipe_lock fs/pipe.c:74 [inline]
 #0:  (&pipe->mutex/1){+.+.+.}, at: [<ffffffff81524a93>] pipe_wait+0x1a3/0x1d0 fs/pipe.c:122
1 lock held by init/18475:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver drivers/tty/tty_io.c:2052 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2130
1 lock held by init/18476:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver drivers/tty/tty_io.c:2052 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2130
1 lock held by init/18477:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver drivers/tty/tty_io.c:2052 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2130
1 lock held by init/18478:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver drivers/tty/tty_io.c:2052 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2130
1 lock held by init/18479:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver drivers/tty/tty_io.c:2052 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2130
1 lock held by init/18480:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver drivers/tty/tty_io.c:2052 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2130

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.141+ #1
 ffff8801d9907d08 ffffffff81b42e79 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810983b0 ffff8801d9907d40
 ffffffff81b4df89 0000000000000001 0000000000000000 0000000000000002
Call Trace:
 [<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81b4df89>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b4df1c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff810984b4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131c65d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131c65d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131c65d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131c65d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff81142c3d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff82817a5c>] 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: 20116 Comm: syz-executor864 Not tainted 4.9.141+ #1
task: ffff880100018000 task.stack: ffff880100008000
RIP: 0010:[<ffffffff82816ef2>] 
c [<ffffffff82816ef2>] __raw_spin_unlock include/linux/spinlock_api_smp.h:154 [inline]
RIP: 0010:[<ffffffff82816ef2>] 
c [<ffffffff82816ef2>] _raw_spin_unlock+0x22/0x50 kernel/locking/spinlock.c:183
RSP: 0018:ffff88010000f588  EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff880171c666c0 RCX: 0000000000000002
RDX: 1ffff1002e38ccd9 RSI: 0000000000000002 RDI: ffff880171c666c0
RBP: ffff88010000f590 R08: ffff880100018920 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff8801cbbc1700 R14: ffff880171c65f00 R15: 0000000000001000
FS:  00007f1bcabed700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f585e702060 CR3: 000000018e858000 CR4: 00000000001606b0
Stack:
 ffff880171c65f00
c ffff88010000f640
c ffffffff821f01d6
c ffffffff821efede
c
 ffff88010000f5e8
c ffffffff81ba7d7b
c 0000000000000246
c ffff880100018000
c
 ffffffff830cc2e0
c ffff88010000f718
c fffffbfff0601200
c 000000000000f608
c
Call Trace:
 [<ffffffff821f01d6>] spin_unlock include/linux/spinlock.h:347 [inline]
 [<ffffffff821f01d6>] task_unlock include/linux/sched.h:3262 [inline]
 [<ffffffff821f01d6>] lowmem_scan+0x546/0xaf0 drivers/staging/android/lowmemorykiller.c:146
 [<ffffffff81449cc6>] do_shrink_slab mm/vmscan.c:398 [inline]
 [<ffffffff81449cc6>] shrink_slab.part.8+0x3c6/0xa00 mm/vmscan.c:501
 [<ffffffff814557fd>] shrink_slab mm/vmscan.c:465 [inline]
 [<ffffffff814557fd>] shrink_node+0x1ed/0x740 mm/vmscan.c:2602
 [<ffffffff814560c7>] shrink_zones mm/vmscan.c:2749 [inline]
 [<ffffffff814560c7>] do_try_to_free_pages mm/vmscan.c:2791 [inline]
 [<ffffffff814560c7>] try_to_free_pages+0x377/0xb80 mm/vmscan.c:3002
 [<ffffffff81428a01>] __perform_reclaim mm/page_alloc.c:3324 [inline]
 [<ffffffff81428a01>] __alloc_pages_direct_reclaim mm/page_alloc.c:3345 [inline]
 [<ffffffff81428a01>] __alloc_pages_slowpath mm/page_alloc.c:3697 [inline]
 [<ffffffff81428a01>] __alloc_pages_nodemask+0x981/0x1bd0 mm/page_alloc.c:3862
 [<ffffffff810d3100>] __alloc_pages include/linux/gfp.h:433 [inline]
 [<ffffffff810d3100>] __alloc_pages_node include/linux/gfp.h:446 [inline]
 [<ffffffff810d3100>] alloc_pages_node include/linux/gfp.h:460 [inline]
 [<ffffffff810d3100>] alloc_thread_stack_node kernel/fork.c:212 [inline]
 [<ffffffff810d3100>] dup_task_struct kernel/fork.c:492 [inline]
 [<ffffffff810d3100>] copy_process.part.8+0x280/0x6a10 kernel/fork.c:1534
 [<ffffffff810d9d12>] copy_process kernel/fork.c:1505 [inline]
 [<ffffffff810d9d12>] _do_fork+0x1b2/0xd30 kernel/fork.c:1972
 [<ffffffff810da967>] SYSC_clone kernel/fork.c:2084 [inline]
 [<ffffffff810da967>] SyS_clone+0x37/0x50 kernel/fork.c:2078
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82817893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c