Hello,

syzbot hit the following crash on net-next commit
6bb46bc57c8e9ce947cc605e555b7204b44d2b10 (Fri Jan 26 16:00:23 2018 +0000)
Merge branch 'cxgb4-fix-dump-collection-when-firmware-crashed'

C reproducer is attached.
syzkaller reproducer is attached.
Raw console output is attached.
compiler: gcc (GCC) 7.1.1 20170620
.config is attached.

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Reported-by: syzbot+8630e35fc7287b392aac@syzkaller.appspotmail.com
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[ 3685]     0  3685    17821        1   184320        0             0 sshd
[ 3692]     0  3692     4376        0    32768        0             0  
syzkaller025682
[ 3695]     0  3695     4376        0    36864        0             0  
syzkaller025682
Kernel panic - not syncing: Out of memory and no killable processes...

CPU: 0 PID: 1 Comm: init Not tainted 4.15.0-rc9+ #212
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:17 [inline]
  dump_stack+0x194/0x257 lib/dump_stack.c:53
  panic+0x1e4/0x41c kernel/panic.c:183
  out_of_memory+0xc56/0x1220 mm/oom_kill.c:1076
  __alloc_pages_may_oom mm/page_alloc.c:3395 [inline]
  __alloc_pages_slowpath+0x1d1b/0x2d00 mm/page_alloc.c:4096
  __alloc_pages_nodemask+0x9fb/0xd80 mm/page_alloc.c:4252
  alloc_pages_current+0xb6/0x1e0 mm/mempolicy.c:2036
  alloc_pages include/linux/gfp.h:492 [inline]
  __page_cache_alloc+0x334/0x500 mm/filemap.c:946
  page_cache_read mm/filemap.c:2388 [inline]
  filemap_fault+0xefc/0x1c20 mm/filemap.c:2572
  ext4_filemap_fault+0x82/0xad fs/ext4/inode.c:6164
  __do_fault+0xeb/0x30f mm/memory.c:3202
  do_read_fault mm/memory.c:3612 [inline]
  do_fault mm/memory.c:3712 [inline]
  handle_pte_fault mm/memory.c:3943 [inline]
  __handle_mm_fault+0x1d8f/0x3ce0 mm/memory.c:4067
  handle_mm_fault+0x334/0x8d0 mm/memory.c:4104
  __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1430
  do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1505
  page_fault+0x4c/0x60 arch/x86/entry/entry_64.S:1260
RIP: 0033:0x7ffa5f1e1410
RSP: 002b:00007ffe0fa32248 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 00007ffe0fa329b0 RCX: 00007ffa5f299dd3
RDX: 00007ffe0fa32280 RSI: 00007ffe0fa323b0 RDI: 0000000000000011
RBP: 00007ffe0fa32b60 R08: 00007ffe0fa32be0 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00007ffe0fa32f40 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled


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