------------[ cut here ]------------
WARNING: CPU: 0 PID: 15536 at mm/page_alloc.c:3556 __alloc_pages_slowpath mm/page_alloc.c:3556 [inline]
WARNING: CPU: 0 PID: 15536 at mm/page_alloc.c:3556 __alloc_pages_nodemask+0x13a0/0x1bd0 mm/page_alloc.c:3862
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 15536 Comm: syz-executor.4 Not tainted 4.9.141+ #1
 ffff8801863d6f88 ffffffff81b42e79 ffffffff82a38ce0 00000000ffffffff
 ffffffff82a96600 0000000000000000 0000000000000009 ffff8801863d7048
 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
 [<ffffffff81429420>] __alloc_pages_slowpath mm/page_alloc.c:3556 [inline]
 [<ffffffff81429420>] __alloc_pages_nodemask+0x13a0/0x1bd0 mm/page_alloc.c:3862
 [<ffffffff8147936a>] __alloc_pages include/linux/gfp.h:433 [inline]
 [<ffffffff8147936a>] __alloc_pages_node include/linux/gfp.h:446 [inline]
 [<ffffffff8147936a>] alloc_pages_node include/linux/gfp.h:460 [inline]
 [<ffffffff8147936a>] kmalloc_order+0x2a/0x70 mm/slab_common.c:1043
 [<ffffffff814793cf>] kmalloc_order_trace+0x1f/0x190 mm/slab_common.c:1054
 [<ffffffff814ee36e>] kmalloc_large include/linux/slab.h:422 [inline]
 [<ffffffff814ee36e>] __kmalloc+0x1ae/0x310 mm/slub.c:3730
 [<ffffffff81a20c19>] kmalloc include/linux/slab.h:495 [inline]
 [<ffffffff81a20c19>] str_read+0x39/0x150 security/selinux/ss/policydb.c:1100
 [<ffffffff81a2217a>] user_read+0x23a/0x3e0 security/selinux/ss/policydb.c:1566
 [<ffffffff81a2b1ea>] policydb_serialport: VM disconnected.