[Xenomai] Weird behavior during debug

Lange Norbert norbert.lange at andritz.com
Tue Dec 19 14:44:42 CET 2017


Problem persists in ipipe-core-4.9.51-x86-4, ipipe-4.4 kernel crashes at boot (likely no good support for this SOC).
Used program is attached, it is being executed twice, once directly via serial or ssh, once via gdbserver or gdb (tested various combinations).

The directly executed program will stop (supposedly at read), as soon as the debugged program is halted.

Norbert

 >-----Original Message-----
 >From: Jan Kiszka [mailto:jan.kiszka at siemens.com]
 >Sent: Dienstag, 19. Dezember 2017 10:35
 >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 2017-12-19 09:56, Lange Norbert wrote:
 >> 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
 >>
 >
 >Does the problem persist with
 >- ipipe-core-4.9.51-x86-4
 >- ipipe-4.4
 >?
 >
 >Jan
 >
 >> 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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 >>  >Siemens AG, Corporate Technology, CT RDA ITP SES-DE
 >>  >Corporate Competence Center Embedded Linux
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 >> Firmensitz/ Registered seat: Wien
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 >Siemens AG, Corporate Technology, CT RDA ITP SES-DE
 >Corporate Competence Center Embedded Linux
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ANDRITZ HYDRO GmbH


Rechtsform/ Legal form: Gesellschaft mit beschränkter Haftung / Corporation

Firmensitz/ Registered seat: Wien

Firmenbuchgericht/ Court of registry: Handelsgericht Wien

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DVR: 0605077

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