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SubjectKASAN: user-memory-access Read in vdso_fault

syzbot found the following issue on:

HEAD commit: eb5f95f1 Merge tag 's390-5.9-6' of git://
git tree: upstream
console output:
kernel config:
dashboard link:
compiler: clang version 10.0.0 ( c2443155a0fb245c8f17f2c1c72b6ea391e86e81)

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:

BUG: KASAN: user-memory-access in vdso_fault+0xc1/0x1b0 arch/x86/entry/vdso/vma.c:67
Read of size 8 at addr 000000001953fc48 by task systemd-udevd/9883

CPU: 0 PID: 9883 Comm: systemd-udevd Not tainted 5.9.0-rc5-syzkaller #0
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+0x1d6/0x29e lib/dump_stack.c:118
__kasan_report mm/kasan/report.c:517 [inline]
kasan_report+0x151/0x1d0 mm/kasan/report.c:530
vdso_fault+0xc1/0x1b0 arch/x86/entry/vdso/vma.c:67
__do_fault+0x138/0x3b0 mm/memory.c:3450
do_read_fault+0x5a6/0x9e0 mm/memory.c:3843
do_fault mm/memory.c:3971 [inline]
handle_pte_fault mm/memory.c:4211 [inline]
__handle_mm_fault mm/memory.c:4346 [inline]
handle_mm_fault+0x1d73/0x29a0 mm/memory.c:4444
do_user_addr_fault+0x515/0xa90 arch/x86/mm/fault.c:1372
handle_page_fault arch/x86/mm/fault.c:1429 [inline]
exc_page_fault+0x129/0x240 arch/x86/mm/fault.c:1482
asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538
RIP: 0033:0x7ffedaddb630
Code: Bad RIP value.
RSP: 002b:00007ffedad997b8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000015
RDX: 0000000058585858 RSI: 0000000000000000 RDI: 00007ffedad997e0
RBP: 0000000000000000 R08: 000000000000fefe R09: 0000000000000030
R10: 0000000000000000 R11: 0000000000000206 R12: 000055e855d83675
R13: 00007ffedad99938 R14: 0000000000080000 R15: 000055e855d83660

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