KASAN: stack-out-of-bounds Read in unmap_page

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: stack-out-of-bounds Read in unmap_page_range mm				1	2121d	2121d	0/26	closed as invalid on 2018/07/07 11:48
upstream	KASAN: stack-out-of-bounds Read in unmap_page_range (2) mm				1	2120d	2120d	0/26	closed as invalid on 2018/07/08 10:08

================================================================== 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: