From: syzbot <syzbot+76004d8cdf5443dcd8e7@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 Write in kvm_vcpu_halt
Date: Sun, 21 Jun 2020 22:27:11 -0700 [thread overview]
Message-ID: <0000000000009fc59f05a8a57efd@google.com> (raw)
Hello,
syzbot found the following crash on:
HEAD commit: 7ae77150 Merge tag 'powerpc-5.8-1' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17d9bfa9100000
kernel config: https://syzkaller.appspot.com/x/.config?x=be4578b3f1083656
dashboard link: https://syzkaller.appspot.com/bug?extid=76004d8cdf5443dcd8e7
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
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+76004d8cdf5443dcd8e7@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: null-ptr-deref in kvm_vcpu_halt+0xea/0x110 arch/x86/kvm/x86.c:7546
Write of size 4 at addr 0000000000000000 by task syz-executor.0/11111
CPU: 1 PID: 11111 Comm: syz-executor.0 Not tainted 5.7.0-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+0x1e9/0x30e lib/dump_stack.c:118
__kasan_report mm/kasan/report.c:517 [inline]
kasan_report+0x151/0x1d0 mm/kasan/report.c:530
kvm_vcpu_halt+0xea/0x110 arch/x86/kvm/x86.c:7546
</IRQ>
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 11111 Comm: syz-executor.0 Tainted: G B 5.7.0-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+0x1e9/0x30e lib/dump_stack.c:118
panic+0x264/0x7a0 kernel/panic.c:221
end_report mm/kasan/report.c:104 [inline]
__kasan_report mm/kasan/report.c:520 [inline]
kasan_report+0x1c9/0x1d0 mm/kasan/report.c:530
kvm_vcpu_halt+0xea/0x110 arch/x86/kvm/x86.c:7546
</IRQ>
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:[~2020-06-22 5:27 UTC|newest]
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