overlayfs: unrecognized mount option "%¬mý÷Ã#wšŽ¶ŸÖç" or missing value
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BUG: KASAN: stack-out-of-bounds in __read_once_size include/linux/compiler.h:183 [inline]
BUG: KASAN: stack-out-of-bounds in update_stack_state+0x6ea/0x700 arch/x86/kernel/unwind_frame.c:270
Read of size 8 at addr ffff8801c3dbe1d8 by task syz-executor3/23686

CPU: 0 PID: 23686 Comm: syz-executor3 Not tainted 4.16.0-rc1+ #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report+0x23b/0x360 mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 __read_once_size include/linux/compiler.h:183 [inline]
 update_stack_state+0x6ea/0x700 arch/x86/kernel/unwind_frame.c:270
 __unwind_start+0xfd/0x330 arch/x86/kernel/unwind_frame.c:404
 unwind_start arch/x86/include/asm/unwind.h:54 [inline]
 perf_callchain_kernel+0x2fb/0x610 arch/x86/events/core.c:2350
 get_perf_callchain+0x48f/0xa50 kernel/events/callchain.c:205
 perf_callchain kernel/events/core.c:6003 [inline]
 perf_prepare_sample+0x118b/0x16f0 kernel/events/core.c:6029
 __perf_event_output kernel/events/core.c:6143 [inline]
 perf_event_output_forward+0xef/0x260 kernel/events/core.c:6161
 __perf_event_overflow+0x207/0x490 kernel/events/core.c:7397
 perf_swevent_overflow+0x20c/0x2c0 kernel/events/core.c:7473
 perf_swevent_event+0x10e/0x270 kernel/events/core.c:7506
 do_perf_sw_event kernel/events/core.c:7614 [inline]
 ___perf_sw_event+0x491/0x6d0 kernel/events/core.c:7645
 perf_sw_event_sched include/linux/perf_event.h:1044 [inline]
 perf_event_task_sched_out include/linux/perf_event.h:1082 [inline]
 prepare_task_switch kernel/sched/core.c:2638 [inline]
 context_switch kernel/sched/core.c:2815 [inline]
 __schedule+0xd53/0x2040 kernel/sched/core.c:3435
 preempt_schedule_common+0x22/0x60 kernel/sched/core.c:3574
 _cond_resched+0x1d/0x30 kernel/sched/core.c:4919
 zap_pmd_range mm/memory.c:1443 [inline]
 zap_pud_range mm/memory.c:1470 [inline]
 zap_p4d_range mm/memory.c:1491 [inline]
 unmap_page_range+0x872/0x22e0 mm/memory.c:1512
 unmap_single_vma+0x15f/0x2d0 mm/memory.c:1557
 unmap_vmas+0xf1/0x1b0 mm/memory.c:1587
 exit_mmap+0x23a/0x500 mm/mmap.c:3020
 __mmput kernel/fork.c:971 [inline]
 mmput+0x223/0x6c0 kernel/fork.c:992
 exit_mm kernel/exit.c:544 [inline]
 do_exit+0x90a/0x1ad0 kernel/exit.c:852
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x73a/0x16d0 kernel/signal.c:2469
 do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x6ed/0x940 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x26/0x9b
RIP: 0033:0x453da9
RSP: 002b:00007f57ba010ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bec8 RCX: 0000000000453da9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bec8
RBP: 000000000072bec8 R08: 0000000000000000 R09: 000000000072bea0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd5c67bedf R14: 00007f57ba0119c0 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea00070f6f80 count:0 mapcount:0 mapping:          (null) index:0xffff8801c3dbeac0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 ffff8801c3dbeac0 00000000ffffffff
raw: dead000000000100 dead000000000200 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c3dbe080: 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00
 ffff8801c3dbe100: 00 00 00 00 00 00 00 00 f2 f3 f3 f3 f3 00 00 00
>ffff8801c3dbe180: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f2
                                                    ^
 ffff8801c3dbe200: f2 f2 f2 f2 f2 f2 f8 f2 f2 f2 f2 f2 f2 f2 00 00
 ffff8801c3dbe280: 00 f2 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00
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