On Thu, 25 Feb 2016 11:09:35 -0800 Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> 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 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html