KASAN: user-memory-access Read in syscall_trace_enter

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: c578ddb3 Merge tag 'linux-kselftest-5.7-rc3' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=165c7d78100000
kernel config: https://syzkaller.appspot.com/x/.config?x=b7a70e992f2f9b68
dashboard link: https://syzkaller.appspot.com/bug?extid=08bbb3a3d0e1835855fe
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
userspace arch: i386
CC: [b...@alien8.de h...@zytor.com linux-...@vger.kernel.org lu...@kernel.org mi...@redhat.com tg...@linutronix.de x...@kernel.org]

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+08bbb3...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: user-memory-access in syscall_trace_enter+0xbcb/0xd10 arch/x86/entry/common.c:99
Read of size 8 at addr 000000c014a3aa50 by task syz-fuzzer/7033

CPU: 0 PID: 7033 Comm: syz-fuzzer Not tainted 5.7.0-rc2-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+0x188/0x20d lib/dump_stack.c:118
__kasan_report.cold+0x5/0x4d mm/kasan/report.c:515
kasan_report+0x33/0x50 mm/kasan/common.c:625
syscall_trace_enter+0xbcb/0xd10 arch/x86/entry/common.c:99
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 7033 Comm: syz-fuzzer Tainted: G B 5.7.0-rc2-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+0x188/0x20d lib/dump_stack.c:118
panic+0x2e3/0x75c kernel/panic.c:221
end_report+0x4d/0x53 mm/kasan/report.c:103
__kasan_report.cold+0xd/0x4d mm/kasan/report.c:518
kasan_report+0x33/0x50 mm/kasan/common.c:625
syscall_trace_enter+0xbcb/0xd10 arch/x86/entry/common.c:99
Shutting down cpus with NMI
Kernel Offset: disabled


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[syzbot]

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