Messages in this thread | | | Date | Thu, 25 Feb 2016 14:23:38 -0500 | From | Steven Rostedt <> | Subject | 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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