linux-kernel - Re: WARNING in arch_install_hw

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Message-ID: <20190327151725.GH32571@zn.tnic>
Date:   Wed, 27 Mar 2019 16:17:25 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+370a6b0f11867bf13515@...kaller.appspotmail.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        the arch/x86 maintainers <x86@...nel.org>
Subject: Re: WARNING in arch_install_hw_breakpoint

On Wed, Mar 27, 2019 at 02:45:24PM +0100, Dmitry Vyukov wrote:
> And run this program:
> https://syzkaller.appspot.com/text?tag=ReproC&x=15439f27200000

Yap, that worked in my guest, after segfaulting a lot first:

[  101.600512][ T7333] Code: Bad RIP value.
[  101.606103][ T7337] repro[7337]: segfault at 155555585 ip 0000000155555585 sp 00007ffff7fdaf10 error 14 in repro[555555554000+1000]
[  101.606248][ T7338] repro[7338]: segfault at 25555554e ip 000000025555554e sp 00007ffff7fdaf10 error 14 in repro[555555554000+1000]
[  101.608498][ T7337] Code: Bad RIP value.
[  101.610442][ T7338] Code: Bad RIP value.
[  101.611417][ T7341] repro[7341]: segfault at 0 ip 0000000000000000 sp 00000000200002c8 error 14
[  101.613342][ T7341] Code: Bad RIP value.
[  101.613798][ T7345] repro[7345]: segfault at 0 ip 0000000000000000 sp 00000000200002c8 error 14
[  101.614292][ T7342] repro[7342]: segfault at 45555554e ip 000000045555554e sp 00007ffff7f98f10 error 14 in repro[555555554000+1000]
[  101.615809][ T7345] Code: Bad RIP value.
[  101.616777][ T7348] repro[7348]: segfault at 155555585 ip 0000000155555585 sp 00007ffff7fdaf10 error 14 in repro[555555554000+1000]
[  101.616802][ T7348] Code: Bad RIP value.
[  101.617733][ T7342] Code: Bad RIP value.
[  105.321676][T11024] ------------[ cut here ]------------
[  105.324183][T11024] Can't find any breakpoint slot
[  105.324229][T11024] WARNING: CPU: 0 PID: 11024 at arch/x86/kernel/hw_breakpoint.c:121 arch_install_hw_breakpoint+0x2d1/0x3a0
...

Thx.

-- 
Regards/Gruss,
    Boris.

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