[LTP] Issue 3 - ptrace06 hung for 7 hours

[LTP] Issue 3 - ptrace06 hung for 7 hours

[Garrett Cooper]

Hi all,
    Ran into another issue. When I was running ptrace06 in the
syscalls test I noticed that it had been hung for over 7 hours -- is
this a known issue?
    strace'ing the child proc didn't help (got ENOPERM), and
strace'ing the parent proc returned nada. I'm going to attach gdb and
figure out what the issue is, but I was wondering whether or not
anyone else knew.
Thanks,
-Garrett

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Re: [LTP] Issue 3 - ptrace06 hung for 7 hours

[Mike Frysinger]

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On Tuesday 06 October 2009 06:07:40 Garrett Cooper wrote:
>     Ran into another issue. When I was running ptrace06 in the
> syscalls test I noticed that it had been hung for over 7 hours -- is
> this a known issue?
>     strace'ing the child proc didn't help (got ENOPERM), and
> strace'ing the parent proc returned nada. I'm going to attach gdb and
> figure out what the issue is, but I was wondering whether or not
> anyone else knew.

you wont be able to strace the child because it's already attached with ptrace 
from the parent.  most likely the parent is sleeping and awaiting a signal 
from the child as there was some race that caused a mismatch.

the test probably could do with a alarm() to prevent such hangs -- in the 
normal case, it should execute in a few seconds if that.
-mike

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Re: [LTP] Issue 3 - ptrace06 hung for 7 hours

[Garrett Cooper]

On Tue, Oct 6, 2009 at 3:43 AM, Mike Frysinger <vapier@gentoo.org> wrote:
> On Tuesday 06 October 2009 06:07:40 Garrett Cooper wrote:
>>     Ran into another issue. When I was running ptrace06 in the
>> syscalls test I noticed that it had been hung for over 7 hours -- is
>> this a known issue?
>>     strace'ing the child proc didn't help (got ENOPERM), and
>> strace'ing the parent proc returned nada. I'm going to attach gdb and
>> figure out what the issue is, but I was wondering whether or not
>> anyone else knew.
>
> you wont be able to strace the child because it's already attached with ptrace
> from the parent.  most likely the parent is sleeping and awaiting a signal
> from the child as there was some race that caused a mismatch.
>
> the test probably could do with a alarm() to prevent such hangs -- in the
> normal case, it should execute in a few seconds if that.

    Looks like it wasn't a well documented known issue:

Index: testcases/kernel/syscalls/ptrace/Makefile
===================================================================
RCS file: /cvsroot/ltp/ltp/testcases/kernel/syscalls/ptrace/Makefile,v
retrieving revision 1.6
diff -u -r1.6 Makefile
--- testcases/kernel/syscalls/ptrace/Makefile   15 Oct 2008 17:07:36
-0000      1.6
+++ testcases/kernel/syscalls/ptrace/Makefile   7 Oct 2009 05:57:23 -0000
@@ -16,16 +16,8 @@
 #  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #

-SRCS    = $(wildcard *[^6].c)
-TARGETS = $(patsubst ptrace%.c,ptrace%,$(SRCS))

    I'm going to yank it from the runtest file (comment it out) and
leave a pointer back to the Makefile / this thread.
Thanks,
-Garrett

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