KASAN: out-of-bounds Read in trace_raw_output_kvm_update_master_clock

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: c0cc2711 Merge tag 'modules-for-v5.7' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17a063e7e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=23c5a352e32a1944
dashboard link: https://syzkaller.appspot.com/bug?extid=1710ad5d47a00f94b962
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

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

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+1710ad...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: out-of-bounds in trace_raw_output_kvm_update_master_clock+0x147/0x170 include/trace/../../arch/x86/kvm/trace.h:827
Read of size 1 at addr ffffc90005206fb8 by task syz-executor.5/28000

CPU: 0 PID: 28000 Comm: syz-executor.5 Not tainted 5.6.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x188/0x20d lib/dump_stack.c:118
print_address_description.constprop.0.cold+0x5/0x315 mm/kasan/report.c:382
__kasan_report.cold+0x35/0x4d mm/kasan/report.c:511
kasan_report+0x33/0x50 mm/kasan/common.c:625
trace_raw_output_kvm_update_master_clock+0x147/0x170 include/trace/../../arch/x86/kvm/trace.h:827
</IRQ>


Memory state around the buggy address:
ffffc90005206e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffffc90005206f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc90005206f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
^
ffffc90005207000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffffc90005207080: 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1
==================================================================


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.