lowmemorykiller: Killing 'syz-executor.3' (28444) (tgid 28438), adj 1000,
   to free 4kB on behalf of 'blkid' (28655) because
   cache 488kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13264kB above reserved
INFO: task blkid:28457 blocked for more than 140 seconds.
      Not tainted 4.9.194+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid           D29272 28457   3069 0x00000000
 0000000000000083 ffff8801a1d18000 ffff8801c604f900 ffff8801db621000
 ffff8801a045df00 ffff8801db621018 ffff8801cd467a28 ffffffff8281af8e
 ffffffff82e2fb90 ffffffff8120d100 000000000000023d ffff8801db6218f0
Call Trace:
 [<000000002f18facf>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
 [<000000009cb2c080>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579
 [<000000009791a755>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<000000009791a755>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621
 [<000000007fb0818f>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404
 [<00000000452de319>] __blkdev_driver_ioctl block/ioctl.c:294 [inline]
 [<00000000452de319>] blkdev_ioctl+0xe14/0x19e0 block/ioctl.c:590
 [<000000001c36555e>] block_ioctl+0xde/0x120 fs/block_dev.c:1696
 [<0000000015e37230>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<0000000015e37230>] file_ioctl fs/ioctl.c:493 [inline]
 [<0000000015e37230>] do_vfs_ioctl+0xb87/0x11d0 fs/ioctl.c:677
 [<000000001810657e>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<000000001810657e>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<00000000e0d7f957>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<0000000021095e4f>] 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 4.9.194+ #0
 ffff8801d98d7cc8 ffffffff81b67001 0000000000000001 0000000000000000
 0000000000000001 ffffffff81099d01 dffffc0000000000 ffff8801d98d7d00
 ffffffff81b7229c 0000000000000001 0000000000000000 0000000000000001
Call Trace:
 [<00000000b7b6266d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<00000000b7b6266d>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<0000000073c00f94>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
 [<00000000a9d34f73>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
 [<000000001014ef72>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<0000000070ed4e01>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<0000000070ed4e01>] check_hung_task kernel/hung_task.c:126 [inline]
 [<0000000070ed4e01>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline]
 [<0000000070ed4e01>] watchdog+0x670/0xaf0 kernel/hung_task.c:263
 [<00000000baebbfca>] kthread+0x278/0x310 kernel/kthread.c:211
 [<0000000092bc6080>] 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: 28618 Comm: blkid Not tainted 4.9.194+ #0
task: 000000005e7a42cf task.stack: 000000001b7768af
RIP: 0010:[<ffffffff82214123>] 
c [<000000000b582d6a>] lowmem_scan+0x433/0xb70 drivers/staging/android/lowmemorykiller.c:284
RSP: 0000:ffff8801ce5276f0  EFLAGS: 00000246
RAX: 1ffff1003a91e37b RBX: ffff8801d48f3398 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff82214103 RDI: ffff8801d48f1bd8
RBP: ffff8801ce527790 R08: ffff8801d48f1f80 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8801d48f17c0 R14: ffff8801d6599140 R15: 000000000000fc18
FS:  00007fd701595740(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc47065a000 CR3: 00000001d800a000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffffffff82213f2f
c ffffffff8220802f
c ffff880100000001
c 0000000000000000
c
 ffff8801d2e40000
c ffff8801d674d6d8
c ffff8801d674d730
c ffff8801ce527860
c
 fffffbfff0601200
c 000174c500000600
c ffff8801d48f1f80
c ffff8801d0d52f80
c
Call Trace:
 [<00000000aa7f52bc>] do_shrink_slab mm/vmscan.c:399 [inline]
 [<00000000aa7f52bc>] shrink_slab.part.0+0x3cf/0xa20 mm/vmscan.c:502
 [<00000000e0bf093b>] shrink_slab mm/vmscan.c:466 [inline]
 [<00000000e0bf093b>] shrink_node+0x1ed/0x750 mm/vmscan.c:2604
 [<00000000b825082f>] shrink_zones mm/vmscan.c:2751 [inline]
 [<00000000b825082f>] do_try_to_free_pages mm/vmscan.c:2793 [inline]
 [<00000000b825082f>] try_to_free_pages+0x397/0xbd0 mm/vmscan.c:3004
 [<00000000f5062c38>] __perform_reclaim mm/page_alloc.c:3332 [inline]
 [<00000000f5062c38>] __alloc_pages_direct_reclaim mm/page_alloc.c:3354 [inline]
 [<00000000f5062c38>] __alloc_pages_slowpath mm/page_alloc.c:3704 [inline]
 [<00000000f5062c38>] __alloc_pages_nodemask+0x930/0x1a80 mm/page_alloc.c:3861
 [<00000000ae50485b>] __alloc_pages include/linux/gfp.h:433 [inline]
 [<00000000ae50485b>] __alloc_pages_node include/linux/gfp.h:446 [inline]
 [<00000000ae50485b>] alloc_pages_node include/linux/gfp.h:460 [inline]
 [<00000000ae50485b>] alloc_zeroed_user_highpage_movable include/linux/highmem.h:183 [inline]
 [<00000000ae50485b>] do_anonymous_page mm/memory.c:2761 [inline]
 [<00000000ae50485b>] handle_pte_fault mm/memory.c:3545 [inline]
 [<00000000ae50485b>] __handle_mm_fault mm/memory.c:3634 [inline]
 [<00000000ae50485b>] handle_mm_fault+0x12e1/0x2420 mm/memory.c:3671
 [<00000000d0be545b>] __do_page_fault+0x3f0/0xa60 arch/x86/mm/fault.c:1401
 [<0000000028d36309>] do_page_fault+0x28/0x30 arch/x86/mm/fault.c:1464
 [<000000004828e395>] page_fault+0x25/0x30 arch/x86/entry/entry_64.S:956
Code: 
c75 
cac 
c48 
c89 
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cb8 
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ce5 
c10 
cff 
c49 
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c18 
c04 
c00 
c00 
c48 
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c48 
cc1 
ce8 
c03 
c42 
c80 
c3c 
c20 
c00 
c0f 
c85 
c86 
c05 
c00 
c00 
c49 
c8b 
c9d 
c18 
c04 
c00 
c00 
c<4c> 
c8d 
cab 
ce8 
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cff 
cff 
c48 
c81 
cfb 
c98 
c15 
c03 
c83 
c0f 
c84 
c22 
c01 
c00 
c00 
ce8 
c