------------[ cut here ]------------
WARNING: CPU: 1 PID: 10120 at mm/page_alloc.c:3544 __alloc_pages_slowpath+0x1136/0x1d90 mm/page_alloc.c:3544
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 10120 Comm: syz-executor6 Not tainted 4.9.84-ge7f51a5 #53
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d45ef668 ffffffff81d956b9 ffffffff83a480c0 ffff8801d45ef740
 ffffffff83aa5400 ffffffff81452f46 0000000000000009 ffff8801d45ef730
 ffffffff8142f571 0000000041b58ab3 ffffffff8418b2c0 ffffffff8142f3b5
Call Trace:
 [<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142f571>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff811311c4>] __warn+0x1c4/0x1e0 kernel/panic.c:542
 [<ffffffff8113142c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff81452f46>] __alloc_pages_slowpath+0x1136/0x1d90 mm/page_alloc.c:3544
 [<ffffffff81453edb>] __alloc_pages_nodemask+0x33b/0x6b0 mm/page_alloc.c:3851
 [<ffffffff814a76ba>] __alloc_pages include/linux/gfp.h:433 [inline]
 [<ffffffff814a76ba>] __alloc_pages_node include/linux/gfp.h:446 [inline]
 [<ffffffff814a76ba>] alloc_pages_node include/linux/gfp.h:460 [inline]
 [<ffffffff814a76ba>] kmalloc_order+0x2a/0x70 mm/slab_common.c:1043
 [<ffffffff814a771f>] kmalloc_order_trace+0x1f/0x190 mm/slab_common.c:1054
 [<ffffffff815398bd>] kmalloc_large include/linux/slab.h:422 [inline]
 [<ffffffff815398bd>] __kmalloc+0x19d/0x310 mm/slub.c:3730
 [<ffffffff82a7d06e>] kmalloc include/linux/slab.h:495 [inline]
 [<ffffffff82a7d06e>] kzalloc include/linux/slab.h:636 [inline]
 [<ffffffff82a7d06e>] keychord_write+0xce/0xbc0 drivers/input/misc/keychord.c:281
 [<ffffffff8156e5f3>] __vfs_write+0x103/0x680 fs/read_write.c:510
 [<ffffffff815702d9>] vfs_write+0x189/0x530 fs/read_write.c:560
 [<ffffffff81573dc9>] SYSC_write fs/read_write.c:607 [inline]
 [<ffffffff81573dc9>] SyS_write+0xd9/0x1b0 fs/read_write.c:599
 [<ffffffff81006f95>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006f95>] do_fast_syscall_32+0x2f5/0x870 arch/x86/entry/common.c:387
 [<ffffffff838b6b10>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..