syzbot

[ 6530]     0  6530     5549      329      13       3        0         -1000 udevd
[ 6531]     0  6531     2097       25      10       3        0         -1000 blkid
[ 6532]     0  6532     2097       25      10       3        0         -1000 blkid
[ 6533]     0  6533       84        1       5       3        0         -1000 blkid
[ 6534]     0  6534     5550      327      13       3        0         -1000 udevd
Kernel panic - not syncing: Out of memory and no killable processes...

CPU: 0 PID: 6356 Comm: blkid Not tainted 4.14.68+ #4
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x11b lib/dump_stack.c:53
 panic+0x1bf/0x3a4 kernel/panic.c:181
 out_of_memory.cold.11+0x20/0x63 mm/oom_kill.c:1072
 __alloc_pages_may_oom mm/page_alloc.c:3356 [inline]
 __alloc_pages_slowpath mm/page_alloc.c:4066 [inline]
 __alloc_pages_nodemask+0x1949/0x2300 mm/page_alloc.c:4222
 __alloc_pages include/linux/gfp.h:461 [inline]
 __alloc_pages_node include/linux/gfp.h:474 [inline]
 alloc_pages_node include/linux/gfp.h:488 [inline]
 __page_cache_alloc include/linux/pagemap.h:226 [inline]
 page_cache_read mm/filemap.c:2286 [inline]
 filemap_fault+0xcdd/0x14a0 mm/filemap.c:2470
 ext4_filemap_fault+0x7d/0xb0 fs/ext4/inode.c:6173
 __do_fault+0x80/0x210 mm/memory.c:3203
 do_read_fault mm/memory.c:3613 [inline]
 do_fault mm/memory.c:3713 [inline]
 handle_pte_fault mm/memory.c:3943 [inline]
 __handle_mm_fault+0xe04/0x23a0 mm/memory.c:4067
 handle_mm_fault+0x2f2/0x6eb mm/memory.c:4104
 __do_page_fault+0x45d/0xb60 arch/x86/mm/fault.c:1427
 page_fault+0x42/0x50 arch/x86/entry/entry_64.S:1104
RIP: 0001:0xa2d8b8
RSP: 0000:0000000000a2da76 EFLAGS: 00a2da76
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: 0x4400000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
Rebooting in 86400 seconds..