==================================================================
BUG: KASAN: stack-out-of-bounds in unmap_page_range+0x1f21/0x2220 mm/memory.c:1503
PANIC: double fault, error_code: 0x0
Read of size 8 at addr ffff8801bf5307f8 by task syz-executor4/24200
CPU: 1 PID: 24194 Comm: syz-executor7 Not tainted 4.18.0-rc3+ #58

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
CPU: 0 PID: 24200 Comm: syz-executor4 Not tainted 4.18.0-rc3+ #58
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
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 unmap_page_range+0x1f21/0x2220 mm/memory.c:1503
 unmap_single_vma+0x1a0/0x310 mm/memory.c:1553
 unmap_vmas+0x120/0x1f0 mm/memory.c:1583
 exit_mmap+0x2c2/0x5b0 mm/mmap.c:3105
 __mmput kernel/fork.c:970 [inline]
 mmput+0x265/0x620 kernel/fork.c:991
 exit_mm kernel/exit.c:544 [inline]
 do_exit+0xea9/0x2750 kernel/exit.c:852
Code: 41 
57 41 89 
cf 41 
56 41 
55 49 
89 fd 
41 54 
45 89 
cc 53 
65 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 
 do_group_exit+0x177/0x440 kernel/exit.c:968
00 00 
00 
48 ba 
00 00 
00 
 get_signal+0x88e/0x1970 kernel/signal.c:2468
00 
00 fc 
ff 
df 48 
89 84 
24 98 
RSP: 0018:ffff8801be5feec0 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 1ffff10037cbfe54 RCX: 0000000000000002
 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620
RBP: ffff8801be5ff248 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000000 R12: 0000000000000000
R13: ffffffff88f92620 R14: ffff8801a93be640 R15: 0000000000000002
FS:  0000000001de6940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8801be5feeb8 CR3: 000000019e719000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace: