==================================================================
PANIC: double fault, error_code: 0x0
BUG: KASAN: stack-out-of-bounds in ptrace_reparented include/linux/ptrace.h:92 [inline]
BUG: KASAN: stack-out-of-bounds in wait_consider_task+0x3792/0x39b0 kernel/exit.c:1374
CPU: 1 PID: 17795 Comm: syz-executor6 Not tainted 4.18.0-rc3+ #45
Read of size 8 at addr ffff880192484668 by task syz-executor6/4454
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__lock_acquire+0x2e/0x5020 kernel/locking/lockdep.c:3294

Code: 
CPU: 0 PID: 4454 Comm: syz-executor6 Not tainted 4.18.0-rc3+ #45
41 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
57 41 
Call Trace:
89 cf 
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
41 56 
41 55 
49 89 
fd 41 
54 45 
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
89 cc 
53 65 
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
4c 8b 
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
34 25 
 ptrace_reparented include/linux/ptrace.h:92 [inline]
 wait_consider_task+0x3792/0x39b0 kernel/exit.c:1374
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 
 do_wait_thread kernel/exit.c:1451 [inline]
 do_wait+0x477/0xb80 kernel/exit.c:1522
00 
00 00 
00 fc 
ff df 
48 89 
84 24 
98 
 kernel_wait4+0x247/0x3f0 kernel/exit.c:1665
RSP: 0018:ffff880192455f70 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 1ffff1003248ac6b RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620
RBP: ffff880192456300 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000000 R12: 0000000000000000
 __do_sys_wait4+0x137/0x150 kernel/exit.c:1677
R13: ffffffff88f92620 R14: ffff8801ccf20540 R15: 0000000000000002
FS:  00007f45350e8700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff880192455f68 CR3: 0000000008e6a000 CR4: 00000000001406e0
DR0: 00000000200001c0 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace: