[Xenomai] Weird behavior during debug

Lange Norbert norbert.lange at andritz.com
Tue Dec 19 09:56:37 CET 2017


Hello Jan,

My follow-up post was done after running the latest ipipe-4.9.y patch, with your fix added on top.

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 834e6117f5f8..b9f6121c8530 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -83,7 +83,7 @@ config X86
        select HAVE_AOUT                        if X86_32
        select HAVE_ARCH_AUDITSYSCALL
        select HAVE_ARCH_HUGE_VMAP              if X86_64 || X86_PAE
-       select HAVE_ARCH_JUMP_LABEL
+       select HAVE_ARCH_JUMP_LABEL             if !IPIPE
        select HAVE_ARCH_KASAN                  if X86_64 && SPARSEMEM_VMEMMAP
        select HAVE_ARCH_KGDB
        select HAVE_ARCH_KMEMCHECK

Norbert

 >-----Original Message-----
 >From: Jan Kiszka [mailto:jan.kiszka at siemens.com]
 >Sent: Dienstag, 19. Dezember 2017 08:16
 >To: Lange Norbert; Xenomai (xenomai at xenomai.org)
 >Subject: Re: Weird behavior during debug
 >
 >EMAIL from a NON-ANDRITZ SOURCE: as a security measure, please exercise
 >caution with email content and any links or attachments.
 >
 >
 >On 2017-12-18 15:49, Lange Norbert wrote:
 >> Same issue with latest ipipe. Threads look like this (when the instance is
 >halted in the debugger).
 >> Somehow, atleast the RT Tasks will block waiting on a timerfd when one task
 >is in state XT (whatever that means)
 >>
 >> # cat /proc/xenomai/sched/threads
 >> CPU  PID    CLASS  TYPE      PRI   TIMEOUT       STAT       NAME
 >>   0  0      idle   core       -1   -             R          [ROOT/0]
 >>   1  0      idle   core       -1   -             R          [ROOT/1]
 >>   2  0      idle   core       -1   -             R          [ROOT/2]
 >>   3  0      idle   core       -1   -             R          [ROOT/3]
 >>   2  264    rt     cobalt     20   -             XT         packetfilter
 >>   1  279    rt     cobalt     20   -             W          packetfilter
 >>
 >
 >Philippe reverted a number of commits in ipipe-4.9.y some days ago.
 >Please retry either with the latest version or the last release
 >(ipipe-core-4.9.51-x86-4).
 >
 >Jan
 >
 >>  >-----Original Message-----
 >>  >From: Lange Norbert
 >>  >Sent: Montag, 18. Dezember 2017 14:43
 >>  >To: Xenomai (xenomai at xenomai.org)
 >>  >Subject: Weird behavior during debug
 >>  >
 >>  >Hello,
 >>  >
 >>  >I tried debugging a cobalt application, and when I hit a breakpoint most of
 >the
 >>  >system freezes.
 >>  >If I run for example top over Serial or SSH, then the display won`t be
 >refreshed
 >>  >anymore,
 >>  >A separate program running as RT Task, waiting for an timer-event
 >(occurring
 >>  >10 times a second) will block aswell.
 >>  >
 >>  >So the debug session seems to block a rather big amount of events.
 >>  >
 >>  >I am using a 4.9 kernel with ipipe at "x86/ipipe: fix detection of unhandled
 >>  >faults over the head domain".
 >>  >Looking at the logs and other threads there seems to be a bigger rework in
 >>  >progress?
 >>  >I will retry with master, and report back.
 >>  >
 >>  >Kind regards
 >>  >
 >>  >Norbert Lange
 >>
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