BUG: Bad page state in process syz-executor.4  pfn:772b1
page:ffffea0001dcac40 count:0 mapcount:0 mapping:ffff888092935860 index:0xf
shmem_aops 
name:"memfd:" 
flags: 0x1fffc000008000c(uptodate|dirty|swapbacked)
raw: 01fffc000008000c ffffea0001a15708 ffff8880571bf600 ffff888092935860
raw: 000000000000000f 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: non-NULL mapping
Modules linked in:
CPU: 1 PID: 305 Comm: syz-executor.4 Not tainted 5.0.0-rc7-next-20190220 #39
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:1014
 free_pages_check mm/page_alloc.c:1023 [inline]
 free_pages_prepare mm/page_alloc.c:1113 [inline]
 free_pcp_prepare mm/page_alloc.c:1138 [inline]
 free_unref_page_prepare mm/page_alloc.c:3003 [inline]
 free_unref_page_list+0x31d/0xc40 mm/page_alloc.c:3072
 release_pages+0x60d/0x1940 mm/swap.c:794
 pagevec_lru_move_fn+0x218/0x2a0 mm/swap.c:213
 __pagevec_lru_add mm/swap.c:920 [inline]
 __lru_cache_add+0x1c4/0x2d0 mm/swap.c:404
 lru_cache_add_anon+0x1e2/0x360 mm/swap.c:416
 shmem_getpage_gfp+0x79c/0x2500 mm/shmem.c:1872
 shmem_getpage mm/shmem.c:139 [inline]
 shmem_file_read_iter+0x30a/0xbc0 mm/shmem.c:2546
 call_read_iter include/linux/fs.h:1851 [inline]
 generic_file_splice_read+0x4b4/0x800 fs/splice.c:306
 do_splice_to+0x12a/0x190 fs/splice.c:876
 splice_direct_to_actor+0x2d2/0x970 fs/splice.c:953
 do_splice_direct+0x1da/0x2a0 fs/splice.c:1062
 do_sendfile+0x597/0xd00 fs/read_write.c:1442
 __do_sys_sendfile64 fs/read_write.c:1503 [inline]
 __se_sys_sendfile64 fs/read_write.c:1489 [inline]
 __x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1489
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457e29
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc8d0ca4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457e29
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000102000000 R11: 0000000000000246 R12: 00007fc8d0ca56d4
R13: 00000000004c4dce R14: 00000000004d8a58 R15: 00000000ffffffff
BUG: Bad page state in process syz-executor.4  pfn:6855c
page:ffffea0001a15700 count:0 mapcount:0 mapping:ffff888092935860 index:0xe
shmem_aops 
name:"memfd:" 
flags: 0x1fffc000008000c(uptodate|dirty|swapbacked)
raw: 01fffc000008000c ffff8880571bf600 ffff8880571bf600 ffff888092935860
raw: 000000000000000e 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: non-NULL mapping
Modules linked in:
CPU: 1 PID: 305 Comm: syz-executor.4 Tainted: G    B             5.0.0-rc7-next-20190220 #39
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:1014
 free_pages_check mm/page_alloc.c:1023 [inline]
 free_pages_prepare mm/page_alloc.c:1113 [inline]
 free_pcp_prepare mm/page_alloc.c:1138 [inline]
 free_unref_page_prepare mm/page_alloc.c:3003 [inline]
 free_unref_page_list+0x31d/0xc40 mm/page_alloc.c:3072
 release_pages+0x60d/0x1940 mm/swap.c:794
 pagevec_lru_move_fn+0x218/0x2a0 mm/swap.c:213
 __pagevec_lru_add mm/swap.c:920 [inline]
 __lru_cache_add+0x1c4/0x2d0 mm/swap.c:404
 lru_cache_add_anon+0x1e2/0x360 mm/swap.c:416
 shmem_getpage_gfp+0x79c/0x2500 mm/shmem.c:1872
 shmem_getpage mm/shmem.c:139 [inline]
 shmem_file_read_iter+0x30a/0xbc0 mm/shmem.c:2546
 call_read_iter include/linux/fs.h:1851 [inline]
 generic_file_splice_read+0x4b4/0x800 fs/splice.c:306
 do_splice_to+0x12a/0x190 fs/splice.c:876
 splice_direct_to_actor+0x2d2/0x970 fs/splice.c:953
 do_splice_direct+0x1da/0x2a0 fs/splice.c:1062
 do_sendfile+0x597/0xd00 fs/read_write.c:1442
 __do_sys_sendfile64 fs/read_write.c:1503 [inline]
 __se_sys_sendfile64 fs/read_write.c:1489 [inline]
 __x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1489
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457e29
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc8d0ca4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457e29
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000102000000 R11: 0000000000000246 R12: 00007fc8d0ca56d4
R13: 00000000004c4dce R14: 00000000004d8a58 R15: 00000000ffffffff