Free memory is -13352kB above reserved
lowmemorykiller: Killing 'syz-executor.5' (9040) (tgid 9040), adj 1000,
   to free 34844kB on behalf of 'blkid' (24219) because
   cache 908kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13352kB above reserved
INFO: task init:23983 blocked for more than 140 seconds.
      Not tainted 4.9.189+ #3
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init            D28168 23983      1 0x00000000
 0000000000000087 ffff8801cd13c740 ffff8801d3dbcd00 ffff8801db621000
 ffff8801d43b97c0 ffff8801db621018 ffff8801d6a07758 ffffffff82818d1e
 ffff8801cd13d008 ffff8801cd13cfe0 00ff8801cd13d010 ffff8801db6218f0
Call Trace:
 [<00000000476d2fe2>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
 [<00000000025c0c21>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579
 [<000000008fae1777>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<000000008fae1777>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621
 [<00000000262112cd>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline]
 [<00000000262112cd>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140
 [<00000000c60156aa>] chrdev_open+0x230/0x630 fs/char_dev.c:398
 [<0000000074f8bfb1>] do_dentry_open+0x422/0xd20 fs/open.c:791
 [<00000000431c47ce>] vfs_open+0x105/0x230 fs/open.c:904
 [<00000000f750492f>] do_last fs/namei.c:3457 [inline]
 [<00000000f750492f>] path_openat+0xbf5/0x2f60 fs/namei.c:3581
 [<00000000f3bcfd06>] do_filp_open+0x1a1/0x280 fs/namei.c:3615
 [<0000000086d8e879>] do_sys_open+0x2f0/0x610 fs/open.c:1097
 [<000000003ae7a0e0>] SYSC_open fs/open.c:1115 [inline]
 [<000000003ae7a0e0>] SyS_open+0x2d/0x40 fs/open.c:1110
 [<000000003cde5576>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<000000008b96a13f>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.189+ #3
 ffff8801d98d7cc8 ffffffff81b65c01 0000000000000001 0000000000000000
 0000000000000001 ffffffff81099a01 dffffc0000000000 ffff8801d98d7d00
 ffffffff81b70e9c 0000000000000001 0000000000000000 0000000000000001
Call Trace:
 [<000000009067178f>] __dump_stack lib/dump_stack.c:15 [inline]
 [<000000009067178f>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<00000000ef304718>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
 [<0000000035480c05>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
 [<00000000bf3a6550>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<00000000b1adbb31>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<00000000b1adbb31>] check_hung_task kernel/hung_task.c:126 [inline]
 [<00000000b1adbb31>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline]
 [<00000000b1adbb31>] watchdog+0x670/0xaf0 kernel/hung_task.c:263
 [<000000003f7dab9b>] kthread+0x278/0x310 kernel/kthread.c:211
 [<00000000ffebd0c5>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 24497 Comm: udevd Not tainted 4.9.189+ #3
task: 00000000d821e59d task.stack: 00000000964d48bb
RIP: 0010:[<ffffffff81322396>] 
c [<00000000f04ec377>] __sanitizer_cov_trace_pc+0x26/0x50 kernel/kcov.c:100
RSP: 0000:ffff88003e76f3b0  EFLAGS: 00000246
RAX: ffff8801af7d0000 RBX: ffffffff83139bc0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff814dba92 RDI: ffffffff8334d760
RBP: ffff88003e76f3b0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000013d6f R15: ffffffff8334d760
FS:  00007f9a39b1a7a0(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f235d00ea30 CR3: 000000003e75d000 CR4: 00000000001606b0
DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffff88003e76f3d8
c ffffffff814dba92
c 00000000000000b3
c 0000000000028c80
c
 0000000000000080
c ffff88003e76f488
c ffffffff822121c3
c ffffffff822122ef
c
 ffffffff822063ef
c ffff880100000001
c 0000000000000000
c ffff8801af7d0000
c
Call Trace:
 [<00000000c2b51d04>] total_swapcache_pages+0x22/0x60 mm/swap_state.c:60
 [<0000000099f6d573>] lowmem_scan+0x113/0xb70 drivers/staging/android/lowmemorykiller.c:257
 [<000000007a103868>] do_shrink_slab mm/vmscan.c:399 [inline]
 [<000000007a103868>] shrink_slab.part.0+0x3cf/0xa20 mm/vmscan.c:502
 [<00000000bac7733b>] shrink_slab mm/vmscan.c:466 [inline]
 [<00000000bac7733b>] shrink_node+0x1ed/0x750 mm/vmscan.c:2604
 [<000000001428898c>] shrink_zones mm/vmscan.c:2751 [inline]
 [<000000001428898c>] do_try_to_free_pages mm/vmscan.c:2793 [inline]
 [<000000001428898c>] try_to_free_pages+0x397/0xbd0 mm/vmscan.c:3004
 [<000000000b06f9dc>] __perform_reclaim mm/page_alloc.c:3332 [inline]
 [<000000000b06f9dc>] __alloc_pages_direct_reclaim mm/page_alloc.c:3354 [inline]
 [<000000000b06f9dc>] __alloc_pages_slowpath mm/page_alloc.c:3704 [inline]
 [<000000000b06f9dc>] __alloc_pages_nodemask+0x930/0x1a80 mm/page_alloc.c:3861
 [<00000000c4d6c715>] __alloc_pages include/linux/gfp.h:433 [inline]
 [<00000000c4d6c715>] __alloc_pages_node include/linux/gfp.h:446 [inline]
 [<00000000c4d6c715>] alloc_pages_node include/linux/gfp.h:460 [inline]
 [<00000000c4d6c715>] __page_cache_alloc include/linux/pagemap.h:208 [inline]
 [<00000000c4d6c715>] __do_page_cache_readahead+0x21d/0x880 mm/readahead.c:183
 [<0000000081af2bd2>] ra_submit mm/internal.h:61 [inline]
 [<0000000081af2bd2>] do_sync_mmap_readahead mm/filemap.c:2239 [inline]
 [<0000000081af2bd2>] filemap_fault+0xd7f/0x1360 mm/filemap.c:2328
 [<0000000013a459aa>] ext4_filemap_fault+0x72/0xa0 fs/ext4/inode.c:5854
 [<000000006c53c518>] __do_fault+0x2a8/0x6c0 mm/memory.c:2855
 [<00000000b3e5bf62>] do_read_fault mm/memory.c:3202 [inline]
 [<00000000b3e5bf62>] do_fault mm/memory.c:3338 [inline]
 [<00000000b3e5bf62>] handle_pte_fault mm/memory.c:3547 [inline]
 [<00000000b3e5bf62>] __handle_mm_fault mm/memory.c:3634 [inline]
 [<00000000b3e5bf62>] handle_mm_fault+0x11bc/0x2420 mm/memory.c:3671
 [<000000004118313d>] __do_page_fault+0x3f0/0xa60 arch/x86/mm/fault.c:1404
 [<000000004536e611>] do_page_fault+0x28/0x30 arch/x86/mm/fault.c:1467
 [<00000000294a43f3>] page_fault+0x25/0x30 arch/x86/entry/entry_64.S:956
Code: 
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c