From: syzbot <syzbot+4a946e65aa25edfdb55f@syzkaller.appspotmail.com>
To: bp@alien8.de, hpa@zytor.com, jmattson@google.com,
joro@8bytes.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, mingo@redhat.com,
pbonzini@redhat.com, sean.j.christopherson@intel.com,
syzkaller-bugs@googlegroups.com, tglx@linutronix.de,
vkuznets@redhat.com, wanpengli@tencent.com, x86@kernel.org
Subject: KASAN: null-ptr-deref Read in init_emulate_ctxt
Date: Sun, 12 Apr 2020 07:11:12 -0700 [thread overview]
Message-ID: <000000000000f2ecd605a31889d0@google.com> (raw)
Hello,
syzbot found the following crash on:
HEAD commit: f5e94d10 Merge tag 'drm-next-2020-04-08' of git://anongit...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17e6d61be00000
kernel config: https://syzkaller.appspot.com/x/.config?x=ca75979eeebf06c2
dashboard link: https://syzkaller.appspot.com/bug?extid=4a946e65aa25edfdb55f
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+4a946e65aa25edfdb55f@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: null-ptr-deref in init_emulate_ctxt+0x497/0x4a0 arch/x86/kvm/x86.c:6424
Read of size 8 at addr 0000000000000005 by task syz-executor.2/9707
CPU: 1 PID: 9707 Comm: syz-executor.2 Not tainted 5.6.0-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
init_emulate_ctxt+0x497/0x4a0 arch/x86/kvm/x86.c:6424
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 9707 Comm: syz-executor.2 Tainted: G B 5.6.0-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
init_emulate_ctxt+0x497/0x4a0 arch/x86/kvm/x86.c:6424
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See:
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reply other threads:[~2020-04-12 14:11 UTC|newest]
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