BUG: Bad page state in process blkid  pfn:651b1
page:ffffea0001946c40 count:0 mapcount:0 mapping:ffff888093479300 index:0x81
shmem_aops 
name:"memfd:cgroup2" 
flags: 0x1fffc000008000e(referenced|uptodate|dirty|swapbacked)
raw: 01fffc000008000e ffff88805e2af878 ffff88805e2af878 ffff888093479300
raw: 0000000000000081 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: non-NULL mapping
Modules linked in:
CPU: 0 PID: 7955 Comm: blkid Not tainted 5.0.0-rc8-next-20190228 #45
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 bad_page.cold+0xda/0xff mm/page_alloc.c:586
 free_pages_check_bad+0x142/0x1a0 mm/page_alloc.c:1013
 free_pages_check mm/page_alloc.c:1022 [inline]
 free_pages_prepare mm/page_alloc.c:1112 [inline]
 free_pcp_prepare mm/page_alloc.c:1137 [inline]
 free_unref_page_prepare mm/page_alloc.c:3001 [inline]
 free_unref_page_list+0x31d/0xc40 mm/page_alloc.c:3070
 release_pages+0x60d/0x1940 mm/swap.c:794
 pagevec_lru_move_fn+0x218/0x2a0 mm/swap.c:213
 activate_page_drain mm/swap.c:297 [inline]
 lru_add_drain_cpu+0x3b1/0x520 mm/swap.c:596
 lru_add_drain+0x20/0x60 mm/swap.c:647
 unmap_region+0xdf/0x3f0 mm/mmap.c:2602
 __do_munmap+0x637/0xef0 mm/mmap.c:2824
 do_munmap mm/mmap.c:2835 [inline]
 mmap_region+0x227/0x1770 mm/mmap.c:1729
 do_mmap+0x8e2/0x1080 mm/mmap.c:1559
 do_mmap_pgoff include/linux/mm.h:2374 [inline]
 vm_mmap_pgoff+0x1c5/0x230 mm/util.c:362
 ksys_mmap_pgoff+0x4aa/0x630 mm/mmap.c:1609
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
 __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f742c5583ea
Code: 48 8d 3d 81 69 00 00 b2 84 e8 52 ec ff ff f7 d8 89 05 ae ad 20 00 eb c6 90 90 90 90 90 90 90 90 49 89 ca b8 09 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d 8a ad 20 00 31 d2 48 29 c2 89
RSP: 002b:00007fff777a8ca8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f742c7604c8 RCX: 00007f742c5583ea
RDX: 0000000000000003 RSI: 0000000000004000 RDI: 00007f742c53e000
RBP: 00007fff777a8f70 R08: 0000000000000003 R09: 0000000000023000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007fff777a9058
R13: 0000000000000002 R14: 00007fff777a8d20 R15: 00007fff777a8cf0