------------[ cut here ]------------
WARNING: CPU: 0 PID: 6094 at mm/page_alloc.c:3550 __alloc_pages_slowpath+0x1136/0x1d90 mm/page_alloc.c:3550
device lo entered promiscuous mode
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6094 Comm: syz-executor6 Not tainted 4.9.75-g5f5e5d4 #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c7a6f6e0 ffffffff81d93049 ffffffff83a47180 ffff8801c7a6f7b8
 ffffffff83aa4400 ffffffff81451c26 0000000000000009 ffff8801c7a6f7a8
 ffffffff8142e281 0000000041b58ab3 ffffffff84189648 ffffffff8142e0c5
Call Trace:
 [<ffffffff81d93049>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d93049>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142e281>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff81130054>] __warn+0x1c4/0x1e0 kernel/panic.c:542
 [<ffffffff811302bc>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff81451c26>] __alloc_pages_slowpath+0x1136/0x1d90 mm/page_alloc.c:3550
 [<ffffffff81452bbb>] __alloc_pages_nodemask+0x33b/0x6b0 mm/page_alloc.c:3857
 [<ffffffff814a5f8a>] __alloc_pages include/linux/gfp.h:433 [inline]
 [<ffffffff814a5f8a>] __alloc_pages_node include/linux/gfp.h:446 [inline]
 [<ffffffff814a5f8a>] alloc_pages_node include/linux/gfp.h:460 [inline]
 [<ffffffff814a5f8a>] kmalloc_order+0x2a/0x70 mm/slab_common.c:1043
 [<ffffffff814a5fef>] kmalloc_order_trace+0x1f/0x190 mm/slab_common.c:1054
 [<ffffffff8153816d>] kmalloc_large include/linux/slab.h:422 [inline]
 [<ffffffff8153816d>] __kmalloc+0x19d/0x310 mm/slub.c:3730
 [<ffffffff82a7a56e>] kmalloc include/linux/slab.h:495 [inline]
 [<ffffffff82a7a56e>] kzalloc include/linux/slab.h:636 [inline]
 [<ffffffff82a7a56e>] keychord_write+0xce/0xbc0 drivers/input/misc/keychord.c:281
 [<ffffffff8156cd43>] __vfs_write+0x103/0x680 fs/read_write.c:510
 [<ffffffff8156ea29>] vfs_write+0x189/0x530 fs/read_write.c:560
 [<ffffffff8157289f>] SYSC_pwrite64 fs/read_write.c:649 [inline]
 [<ffffffff8157289f>] SyS_pwrite64+0x13f/0x170 fs/read_write.c:636
 [<ffffffff838b0aa8>] entry_SYSCALL_64_fastpath+0x23/0xe2
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..