On 19/05/15 17:39, Richard Weinberger wrote: > On Tue, May 19, 2015 at 6:19 PM, Anton Ivanov > <anton.iva...@kot-begemot.co.uk> wrote: >> Same story. >> >> Overall works quite well, the moment I give it the "dselect upgrade >> test" the userspace hangs. >> >> Kernel continues to work - forwarding, icmp, uml_mconsole are fine. > Do you know where it hangs? > Maybe the kernel does not get any scheduler tick and does not schedule a > task..,
Kernel continues to get ticks, timers increment, io also works. If I strace the kernel I see a mix of SIGALRM (or in the oder version -USR2), SIGIO and SIGCHLD. Nothing out of the ordinary. Uml mconsole works. I cannot get meaningful information because trying to invoke backtraces I get "SIGSEGV in SIGSEGV handler" for all processes. Memory looks OK too - 500MB+ free on a 1GB UML. Syncronous vs asynchronous FS does not change it so it is not a variety of the writeout bug. If I could get a bt for the userspace task and/or its stub we could have nailed it. I suspect it is spinning in skas/process.c for some reason. No idea why, but it takes 100% CPU. A. > ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
