==================================================================
BUG: KASAN: stack-out-of-bounds in futex_wake+0x6b9/0x760 kernel/futex.c:1538
Read of size 8 at addr ffff88019b3f77b0 by task syz-executor5/25829
PANIC: double fault, error_code: 0x0

CPU: 0 PID: 25814 Comm: syz-executor1 Not tainted 4.18.0-rc3+ #45
CPU: 1 PID: 25829 Comm: syz-executor5 Not tainted 4.18.0-rc3+ #45
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
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Code: 41 
Call Trace:
57 41 
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
89 cf 
41 
56 41 
55 49 
89 fd 
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
41 54 
45 89 
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
cc 53 
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
65 
 futex_wake+0x6b9/0x760 kernel/futex.c:1538
4c 8b 
34 25 
 do_futex+0x300/0x27d0 kernel/futex.c:3531
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 
 __do_sys_futex kernel/futex.c:3587 [inline]
 __se_sys_futex kernel/futex.c:3555 [inline]
 __x64_sys_futex+0x472/0x6a0 kernel/futex.c:3555
RSP: 0018:ffff88019a1fbea0 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 1ffff1003343f850 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620
RBP: ffff88019a1fc228 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000000 R12: 0000000000000000
R13: ffffffff88f92620 R14: ffff880199628680 R15: 0000000000000002
FS:  00007f633152e700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88019a1fbe98 CR3: 00000001a3801000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000020000000
DR3: 0000000020000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace: