Am 16.08.2013 18:28, schrieb Tejun Heo: > On Fri, Aug 16, 2013 at 06:15:07PM +0200, Richard Weinberger wrote: >> On UML I hit the case that pwq is NULL. >> Then we oops at &pwq->wq... > > Hmmm? I'm confused. &pwq->wq is pwq's pointer + wq's offset in pwq. > It doesn't involve dereferencing pwq->wq. Maybe uml isn't > implementing probe_kernel_thread()? Now that I think about it, I'm > not sure how it could. > > cc'ing uml people. Hey, guys, workqueue uses proble_kernel_read() to > print out workqueue related information during oops because those > events are completely asynchronous and workqueue states may not be > consistently accessible. It seems like uml doesn't implement > probe_kernel_read() and tries direct derference of incorrect pointers > leading to its own oops. Maybe uml should check whether the memory is > mapped from probe_kernel_read()?
You are already talking to UML people. ;) Anyway, I'll investigate into that. What I see so far is that pwq is NULL after probe_kernel_read(). Thanks, //richard ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite! It's a free troubleshooting tool designed for production. Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
