Am Samstag, den 31.10.2015, 16:30 +0100 schrieb Richard Weinberger: > Am 31.10.2015 um 16:24 schrieb Thomas Meyer: > > Am Samstag, den 31.10.2015, 16:21 +0100 schrieb Richard Weinberger: > > > Am 31.10.2015 um 16:16 schrieb Thomas Meyer: > > > > mhh. strange. I didn't see this behaviour on my machine, but my > > > > machine > > > > is a rare single core system so, likely a race condition while > > > > relaying > > > > the timer interrupt to the userspace process. > > > > > > Here I can trigger it by starting UML, logging in and waiting > > > ~5min. > > > Then i try to run "top" --> top hangs forever. > > > > > > > But I'm out of ideas how this could happen! > > > > > > Maybe some stupid timeslice over/underflow. > > > > > > > what happens when you send the hanging process a SIGVTALRM > > > > signal? > > > > does > > > > it proceed correctly? > > > > > > You mean sending SIGVTALRM to the UML host process? > > > > No, to the hanging userspace process, maybe the uml host process > > did > > receive a timer interrupt, but failed to relay this signal to the > > correct userspace process. > > Well, this is not what top expects and dies. > signal 26 (VTALRM) was caught by top, please > see http://www.debian.org/Bugs/Reporting >
So you did send a VTALARM in the UML system to the top process? When yes then this was a misunderstanding! I wanted you to send a SIGVTALRM on the uml host system to the hanging pid. does this resolve the hang? > The problem is within UML's scheduler it does not wake top > after the nanosleep() expires. > Maybe the new clock is too imprecise, dunno. > > Thanks, > //richard > > --------------------------------------------------------------------- > --------- > _______________________________________________ > User-mode-linux-devel mailing list > User-mode-linux-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel ------------------------------------------------------------------------------ _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
