==================================================================
BUG: KASAN: stack-out-of-bounds in __debug_check_no_obj_freed lib/debugobjects.c:775 [inline]
BUG: KASAN: stack-out-of-bounds in debug_check_no_obj_freed+0x467/0x595 lib/debugobjects.c:815
Read of size 8 at addr ffff8801bf2c00a8 by task blkid/17346

CPU: 1 PID: 17346 Comm: blkid Not tainted 4.18.0-rc3+ #48
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+0x1c9/0x2b4 lib/dump_stack.c:113
PANIC: double fault, error_code: 0x0
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
CPU: 0 PID: 17324 Comm: syz-executor4 Not tainted 4.18.0-rc3+ #48
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
RIP: 0010:__lock_acquire+0x2e/0x5020 kernel/locking/lockdep.c:3294
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
Code: 
 __debug_check_no_obj_freed lib/debugobjects.c:775 [inline]
 debug_check_no_obj_freed+0x467/0x595 lib/debugobjects.c:815
41 57 
41 
89 
 kmem_cache_free+0x216/0x2d0 mm/slab.c:3755
cf 41 
 remove_vma+0x164/0x1b0 mm/mmap.c:185
56 
 exit_mmap+0x365/0x5b0 mm/mmap.c:3116
41 
55 
 __mmput kernel/fork.c:970 [inline]
 mmput+0x265/0x620 kernel/fork.c:991
49 
89 
fd 
41 
54 
45 89 
cc 
53 65 
 exit_mm kernel/exit.c:544 [inline]
 do_exit+0xea9/0x2750 kernel/exit.c:852
4c 
8b 
34 
25 
40 ee 
01 00 
48 
83 e4 
f0 
48 
81 
ec 
60 
03 
00 00 
48 
8b 
45 
10 
<89> 
94 
24 
80 
00 
00 
00 48 
ba 
00 00 
00 00 
00 
fc 
ff df 
48 
89 
84 
24 98 
RSP: 0018:ffff8801b8dffe90 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 1ffff100371c004e RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620
RBP: ffff8801b8e00218 R08: 0000000000000000 R09: 0000000000000000
 do_group_exit+0x177/0x440 kernel/exit.c:968
R10: ffff8801bf3ff1b8 R11: ffff8801dae236b3 R12: 0000000000000000
R13: ffffffff88f92620 R14: ffff8801c9f36040 R15: 0000000000000002
FS:  00007fce9fb05700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8801b8dffe88 CR3: 00000001ccf70000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000020000000
 get_signal+0x88e/0x1970 kernel/signal.c:2468
DR3: 0000000020000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace: