kernel panic: Out of memory and no killable processes...

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 38f2b4a8 Merge 4.9.132 into android-4.9
git tree: android-4.9
console output: https://syzkaller.appspot.com/x/log.txt?x=13c554a5400000
kernel config: https://syzkaller.appspot.com/x/.config?x=912079d9e892f390
dashboard link: https://syzkaller.appspot.com/bug?extid=2981b22a8383249f90c0
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13cf395e400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1585d335400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+2981b2...@syzkaller.appspotmail.com

[ 2072] 0 2072 4380 0 5 2 0
0 syz-executor625
[ 2075] 0 2075 4380 0 5 2 0
0 syz-executor625
[ 2076] 0 2076 4380 0 5 2 0
0 syz-executor625
[ 2077] 0 2077 4380 0 5 2 0
0 syz-executor625
[ 2078] 0 2078 4380 0 5 2 0
0 syz-executor625
Kernel panic - not syncing: Out of memory and no killable processes...

CPU: 0 PID: 1 Comm: init Not tainted 4.9.132+ #103
ffff8801da607760 ffffffff81b371b9 ffffffff82a96100 00000000ffffffff
ffffffff83029100 0000000000000000 dffffc0000000000 ffff8801da607820
ffffffff813f6be5 0000000041b58ab3 ffffffff82e2996b ffffffff813f6a26
Call Trace:
[<ffffffff81b371b9>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81b371b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
[<ffffffff813f6be5>] panic+0x1bf/0x39f kernel/panic.c:179
[<ffffffff814fc707>] out_of_memory.cold.11+0x1e/0x5d mm/oom_kill.c:1058
[<ffffffff814299fe>] __alloc_pages_may_oom mm/page_alloc.c:3135 [inline]
[<ffffffff814299fe>] __alloc_pages_slowpath mm/page_alloc.c:3751 [inline]
[<ffffffff814299fe>] __alloc_pages_nodemask+0x18ee/0x1bd0
mm/page_alloc.c:3862
[<ffffffff81415831>] __alloc_pages include/linux/gfp.h:433 [inline]
[<ffffffff81415831>] __alloc_pages_node include/linux/gfp.h:446 [inline]
[<ffffffff81415831>] alloc_pages_node include/linux/gfp.h:460 [inline]
[<ffffffff81415831>] __page_cache_alloc include/linux/pagemap.h:208
[inline]
[<ffffffff81415831>] page_cache_read mm/filemap.c:2007 [inline]
[<ffffffff81415831>] filemap_fault+0xaf1/0x1110 mm/filemap.c:2192
[<ffffffff816e78d1>] ext4_filemap_fault+0x71/0xa0 fs/ext4/inode.c:5853
[<ffffffff81492fb3>] __do_fault+0x223/0x500 mm/memory.c:2833
[<ffffffff814a3756>] do_read_fault mm/memory.c:3180 [inline]
[<ffffffff814a3756>] do_fault mm/memory.c:3315 [inline]
[<ffffffff814a3756>] handle_pte_fault mm/memory.c:3516 [inline]
[<ffffffff814a3756>] __handle_mm_fault mm/memory.c:3603 [inline]
[<ffffffff814a3756>] handle_mm_fault+0x1326/0x2350 mm/memory.c:3640
[<ffffffff810b2c53>] __do_page_fault+0x403/0xa60 arch/x86/mm/fault.c:1406
[<ffffffff810b3307>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1469
[<ffffffff82804975>] page_fault+0x25/0x30 arch/x86/entry/entry_64.S:951
Kernel Offset: disabled
Rebooting in 86400 seconds..


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