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Message-ID: <CANaxB-xkUKgcYQR0n0dOPTKJOxqsxC=PHwB00hCchwB6VhY45A@mail.gmail.com> Date: Mon, 23 May 2016 22:30:02 -0700 From: Andrei Vagin <avagin@...il.com> To: LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>, Andy Lutomirski <luto@...nel.org>, Oleg Nesterov <oleg@...hat.com>, Cyrill Gorcunov <gorcunov@...nvz.org> Subject: Re: x86: A process doesn't stop on hw breakpoints sometimes On Mon, May 23, 2016 at 6:28 PM, Andrei Vagin <avagin@...il.com> wrote: > On Mon, May 23, 2016 at 4:05 PM, Andrei Vagin <avagin@...il.com> wrote: >> Hi, >> >> We use breakpoints on CRIU to stop a processes before calling >> rt_sigreturn and we found that sometimes a process runs through a >> break-point without stopping on it. >> >> https://github.com/xemul/criu/issues/162 >> >> >> A small reproducer is attached. It forks a child, stops it, sets a >> breakpoint, executes a child, waits when it stops on the breakpoint. I >> execute it a few times concurrently and wait a few minutes. >> >> https://asciinema.org/a/006l3u5v82ubbkfy9fto07agd > > I reproduced this issue on 4.4.9-300.fc23.x86_64 Oops. I can't reproduce this issue on 4.6 and 4.5. Looks like it was fixed between 4.4 and 4.5. Sorry for the noise. > >> >> I know that it can be reproduced on: >> AMD A10 Micro-6700T >> Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz >> Intel(R) Core(TM) i7-4600U CPU @ 2.10GHz >> >> so It doesn't look like a bug in a processor. >> >> Thanks, >> Andrew
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