lkml.org 
[lkml]   [2020]   [May]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: kernel BUG at arch/x86/kvm/mmu/mmu.c:LINE! (2)
On Tue, May 26, 2020 at 02:13:19PM -0700, syzbot wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: c11d28ab Add linux-next specific files for 20200522
> git tree: linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=153b5016100000
> kernel config: https://syzkaller.appspot.com/x/.config?x=3f6dbdea4159fb66
> dashboard link: https://syzkaller.appspot.com/bug?extid=904752567107eefb728c
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11510cba100000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=129301e2100000
>
> The bug was bisected to:
>
> commit 63d04348371b7ea4a134bcf47c79763d969e9168
> Author: Paolo Bonzini <pbonzini@redhat.com>
> Date: Tue Mar 31 22:42:22 2020 +0000
>
> KVM: x86: move kvm_create_vcpu_debugfs after last failure point
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1226e8ee100000
> final crash: https://syzkaller.appspot.com/x/report.txt?x=1126e8ee100000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1626e8ee100000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+904752567107eefb728c@syzkaller.appspotmail.com
> Fixes: 63d04348371b ("KVM: x86: move kvm_create_vcpu_debugfs after last failure point")
>
> L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.
> ------------[ cut here ]------------
> kernel BUG at arch/x86/kvm/mmu/mmu.c:3722!

The bisection has a completely different signature, it's likely a different
bug. I'll take a look at both.

\
 
 \ /
  Last update: 2020-05-27 02:13    [W:0.038 / U:0.856 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site