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Re: BUG: unable to handle kernel paging request from pty_write [was: Linux 4.4.2]

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On Thu, 25 Feb 2016 11:09:35 -0800
Linus Torvalds <torvalds@linux-foundation.org> wrote:


> Jiri, were you messing around with tracing when this happened? Or
> maybe shutting down CPU's? There was a RCU locking problem with CPU
> shutdown, maybe this is one of the symptoms. The fix for that is
> recent, and not in 4.4.2.
> 
> Adding Steven Rostedt to the cc. Steven, does that look like a possible case?

Possible: yes. Likely: no

The recent fix would require shutting down a CPU at the same time as a
tracepoint is enabled or disabled. Rather difficult to hit, but easier
on a virtual machine. If Jiri was not enabling/disabling tracepoints or
shutting down CPUs, then it would not be the bug.

But as the comm of the bug is gdb and this running on a virtual
machine, I think the bug may be elsewhere. Corrupt stack possibly?

-- Steve

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Thread

BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Jiri Slaby <jslaby@suse.cz> - 2016-02-25 11:20 +0100
  Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Peter Hurley <peter@hurleysoftware.com> - 2016-02-25 19:50 +0100
    Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Linus Torvalds <torvalds@linux-foundation.org> - 2016-02-25 20:10 +0100
      Re: BUG: unable to handle kernel paging request from pty_write  [was: Linux 4.4.2] Steven Rostedt <rostedt@goodmis.org> - 2016-02-25 20:30 +0100
        Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Jiri Slaby <jslaby@suse.cz> - 2016-02-26 09:30 +0100
      Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Peter Hurley <peter@hurleysoftware.com> - 2016-02-25 21:40 +0100
        Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Linus Torvalds <torvalds@linux-foundation.org> - 2016-02-25 22:00 +0100
          Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Jiri Slaby <jslaby@suse.cz> - 2016-02-25 22:40 +0100
            Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Peter Hurley <peter@hurleysoftware.com> - 2016-02-25 23:40 +0100
              Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Peter Hurley <peter@hurleysoftware.com> - 2016-02-26 01:40 +0100
                Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Jiri Slaby <jslaby@suse.cz> - 2016-02-26 09:50 +0100
            Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Linus Torvalds <torvalds@linux-foundation.org> - 2016-02-26 01:40 +0100
              Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Jiri Slaby <jslaby@suse.cz> - 2016-02-26 10:00 +0100
                Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Jiri Slaby <jslaby@suse.cz> - 2016-02-26 10:30 +0100
                Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Jiri Slaby <jslaby@suse.cz> - 2016-02-26 11:00 +0100
                Re: BUG: unable to handle kernel paging request from pty_write [was: Linux 4.4.2] Greg KH <gregkh@linuxfoundation.org> - 2016-02-26 18:00 +0100
                Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Linus Torvalds <torvalds@linux-foundation.org> - 2016-02-26 18:20 +0100
                Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Paolo Bonzini <pbonzini@redhat.com> - 2016-02-29 16:50 +0100
                Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Peter Hurley <peter@hurleysoftware.com> - 2016-02-26 19:00 +0100
          Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Peter Hurley <peter@hurleysoftware.com> - 2016-02-25 22:50 +0100
          Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Jiri Kosina <jikos@kernel.org> - 2016-02-25 23:10 +0100
            Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Jiri Slaby <jslaby@suse.cz> - 2016-02-26 09:40 +0100
    Re: BUG: unable to handle kernel paging request from pty_write [was:  Linux 4.4.2] Jiri Slaby <jslaby@suse.cz> - 2016-02-26 09:20 +0100

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