Free memory is -13276kB above reserved
lowmemorykiller: Killing 'syz-executor4' (15211) (tgid 15192), adj 1000,
   to free 12kB on behalf of 'udevd' (15638) because
   cache 392kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13292kB above reserved
INFO: task init:15562 blocked for more than 140 seconds.
      Not tainted 4.9.140+ #68
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init            D28888 15562      1 0x00000000
 ffff8801d20697c0 ffff8801d4547900 ffff8801d1200b00 ffff8801cea197c0
 ffff8801db621018 ffff8801d76a7580 ffffffff82807402 ffff8801d76a7618
 ffffffff830c5278 ffff8801d76a7528 00ffffff81ba7f5c ffff8801db6218f0
Call Trace:
 [<ffffffff8280892f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff82814115>] schedule_timeout+0x735/0xe20 kernel/time/timer.c:1771
 [<ffffffff82810701>] __down_common kernel/locking/semaphore.c:221 [inline]
 [<ffffffff82810701>] __down+0x191/0x2b0 kernel/locking/semaphore.c:238
 [<ffffffff811fcbfe>] down+0x5e/0x80 kernel/locking/semaphore.c:61
 [<ffffffff812223ac>] console_lock+0x2c/0x80 kernel/printk/printk.c:2217
 [<ffffffff8122793c>] console_device+0x1c/0xc0 kernel/printk/printk.c:2554
 [<ffffffff81d2be15>] tty_lookup_driver drivers/tty/tty_io.c:2008 [inline]
 [<ffffffff81d2be15>] tty_open_by_driver drivers/tty/tty_io.c:2053 [inline]
 [<ffffffff81d2be15>] tty_open+0x6f5/0xdf0 drivers/tty/tty_io.c:2130
 [<ffffffff81517bdd>] chrdev_open+0x22d/0x5c0 fs/char_dev.c:392
 [<ffffffff81501e3f>] do_dentry_open+0x3ef/0xc90 fs/open.c:766
 [<ffffffff8150576c>] vfs_open+0x11c/0x210 fs/open.c:879
 [<ffffffff8153c542>] do_last fs/namei.c:3410 [inline]
 [<ffffffff8153c542>] path_openat+0x542/0x2790 fs/namei.c:3534
 [<ffffffff81541617>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8150617d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8150645d>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8150645d>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff828176d3>] 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/1893:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8156cc7c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/2021:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82815792>] 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-executor1/11576:
 #0:  (&sig->cred_guard_mutex){+.+.+.}, at: [<ffffffff81520d73>] prepare_bprm_creds+0x53/0x110 fs/exec.c:1369
1 lock held by blkid/15421:
 #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff810b29a2>] __do_page_fault+0x272/0xa60 arch/x86/mm/fault.c:1335
1 lock held by blkid/15493:
 #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff810b29a2>] __do_page_fault+0x272/0xa60 arch/x86/mm/fault.c:1335
1 lock held by blkid/15550:
 #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff810b29a2>] __do_page_fault+0x272/0xa60 arch/x86/mm/fault.c:1335
1 lock held by init/15562:
 #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/15563:
 #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/15564:
 #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/15565:
 #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/15566:
 #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/15567:
 #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 blkid/15584:
 #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff810b29a2>] __do_page_fault+0x272/0xa60 arch/x86/mm/fault.c:1335
1 lock held by blkid/15650:
 #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff810b29a2>] __do_page_fault+0x272/0xa60 arch/x86/mm/fault.c:1335
1 lock held by blkid/15662:
 #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff810b29a2>] __do_page_fault+0x272/0xa60 arch/x86/mm/fault.c:1335
1 lock held by blkid/15676:
 #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff810b29a2>] __do_page_fault+0x272/0xa60 arch/x86/mm/fault.c:1335

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.140+ #68
 ffff8801d9907d08 ffffffff81b42e79 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810983b0 ffff8801d9907d40
 ffffffff81b4df89 0000000000000001 0000000000000000 0000000000000003
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
 [<ffffffff8281789c>] 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: 15427 Comm: blkid Not tainted 4.9.140+ #68
task: ffff8801d53f2f80 task.stack: ffff88019f2d8000
RIP: 0010:[<ffffffff811675ab>] 
c [<ffffffff811675ab>] __preempt_count_add arch/x86/include/asm/preempt.h:69 [inline]
RIP: 0010:[<ffffffff811675ab>] 
c [<ffffffff811675ab>] preempt_count_add+0x6b/0x1c0 kernel/sched/core.c:3241
RSP: 0018:ffff88019f2df2e8  EFLAGS: 00000282
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 1ffffffff083d708 RSI: ffffffff8141a052 RDI: 0000000000000001
RBP: ffff88019f2df2f8 R08: ffff8801d53f38f0 R09: 1092a66f7fecc0e7
R10: ffff8801d53f2f80 R11: 0000000000000001 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff8801a24087c0 R15: ffff8801a2408738
FS:  00007fb91ab6d740(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2299265000 CR3: 00000001c82c6000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffff8801a24087c0
c ffff8801a2408000
c ffff88019f2df318
c ffffffff82816a46
c
 ffff88019f2df318
c ffff8801a2408000
c ffff88019f2df360
c ffffffff8141a061
c
 ffffffff81419f70
c ffffed00344810e7
c ffff8801a2408000
c dffffc0000000000
c
Call Trace:
 [<ffffffff82816a46>] __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
 [<ffffffff82816a46>] _raw_spin_lock+0x16/0x50 kernel/locking/spinlock.c:151
 [<ffffffff8141a061>] spin_lock include/linux/spinlock.h:302 [inline]
 [<ffffffff8141a061>] task_lock include/linux/sched.h:3257 [inline]
 [<ffffffff8141a061>] find_lock_task_mm+0xf1/0x270 mm/oom_kill.c:115
 [<ffffffff821efe8f>] lowmem_scan+0x34f/0xaf0 drivers/staging/android/lowmemorykiller.c:134
 [<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
 [<ffffffff8143564a>] __alloc_pages include/linux/gfp.h:433 [inline]
 [<ffffffff8143564a>] __alloc_pages_node include/linux/gfp.h:446 [inline]
 [<ffffffff8143564a>] alloc_pages_node include/linux/gfp.h:460 [inline]
 [<ffffffff8143564a>] __page_cache_alloc include/linux/pagemap.h:208 [inline]
 [<ffffffff8143564a>] __do_page_cache_readahead+0x21a/0x8b0 mm/readahead.c:183
 [<ffffffff81415534>] ra_submit mm/internal.h:59 [inline]
 [<ffffffff81415534>] do_sync_mmap_readahead mm/filemap.c:2066 [inline]
 [<ffffffff81415534>] filemap_fault+0x924/0x1110 mm/filemap.c:2143
 [<ffffffff816e7721>] ext4_filemap_fault+0x71/0xa0 fs/ext4/inode.c:5853
 [<ffffffff81492ef3>] __do_fault+0x223/0x500 mm/memory.c:2833
 [<ffffffff814a3696>] do_read_fault mm/memory.c:3180 [inline]
 [<ffffffff814a3696>] do_fault mm/memory.c:3315 [inline]
 [<ffffffff814a3696>] handle_pte_fault mm/memory.c:3516 [inline]
 [<ffffffff814a3696>] __handle_mm_fault mm/memory.c:3603 [inline]
 [<ffffffff814a3696>] handle_mm_fault+0x1326/0x2350 mm/memory.c:3640
 [<ffffffff810b2b33>] __do_page_fault+0x403/0xa60 arch/x86/mm/fault.c:1406
 [<ffffffff810b31e7>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1469
 [<ffffffff828186f5>] page_fault+0x25/0x30 arch/x86/entry/entry_64.S:951
Code: 
c03 
c85 
cc9 
c75 
c07 
c65 
c8b 
c05 
c04 
c08 
ceb 
c7e 
c48 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c48 
c89 
cda 
c83 
ce3 
c07 
c48 
cc1 
cea 
c03 
c83 
cc3 
c03 
c65 
c44 
c01 
c25 
ce5 
c07 
ceb 
c7e 
c<0f> 
cb6 
c04 
c02 
c38 
cc3 
c7c 
c08 
c84 
cc0 
c0f 
c85 
c0b 
c01 
c00 
c00 
c8b 
c15 
c7f 
c42 
c08 
c