lowmemorykiller: Killing 'syz-executor.3' (6235) (tgid 6235), adj 1000,
   to free 34860kB on behalf of 'kthreadd' (2) because
   cache 7744kB is below limit 8192kB for oom_score_adj 1
   Free memory is -13372kB above reserved
------------[ cut here ]------------
WARNING: CPU: 0 PID: 27702 at arch/x86/mm/pat.c:1019 untrack_pfn+0x242/0x290 arch/x86/mm/pat.c:1019
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 27702 Comm: kworker/0:20 Not tainted 4.9.141+ #1
Workqueue: events mmput_async_fn
 ffff8801cc08f858 ffffffff81b42e79 ffffffff82a38ce0 00000000ffffffff
 ffffffff82a34000 0000000000000000 0000000000000009 ffff8801cc08f918
 ffffffff813f7125 0000000041b58ab3 ffffffff82e2b62b ffffffff813f6f66
Call Trace:
 [<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff813f7125>] panic+0x1bf/0x39f kernel/panic.c:179
 [<ffffffff813f7362>] __warn.cold.8+0x2f/0x2f kernel/panic.c:542
 [<ffffffff810dc02c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff810be9c2>] untrack_pfn+0x242/0x290 arch/x86/mm/pat.c:1019
 [<ffffffff8149a471>] unmap_single_vma+0x141/0x170 mm/memory.c:1315
 [<ffffffff8149ab51>] unmap_vmas+0x81/0xd0 mm/memory.c:1366
 [<ffffffff814b0c2c>] exit_mmap+0x1cc/0x3a0 mm/mmap.c:3021
 [<ffffffff810d230b>] __mmput kernel/fork.c:884 [inline]
 [<ffffffff810d230b>] mmput_async_fn+0xab/0x330 kernel/fork.c:914
 [<ffffffff81131001>] process_one_work+0x831/0x15f0 kernel/workqueue.c:2092
 [<ffffffff81131e96>] worker_thread+0xd6/0x1140 kernel/workqueue.c:2226
 [<ffffffff81142c3d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff82817a5c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Kernel Offset: disabled
Rebooting in 86400 seconds..