Date: Thu, 25 Sep 2014 21:22:55 -0700 From: madhava gaikwad <alex_madhava@yahoo.com> To: "freebsd-dtrace@freebsd.org" <freebsd-dtrace@freebsd.org> Subject: [freebsd 9.2] dtrace causes hung process when called for strlen Message-ID: <1411705375.19660.YahooMailNeo@web122002.mail.ne1.yahoo.com>
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Hello Experts,
I am a freebsd newbie and having a strange issue on freebsd 9.2 (It is AMD64
machine).I am not able to dtrace few libc functions. For example I am able to
dtrace strdup, but calling dtrace for strlen causes hung process. It is 100 % percent repro-able. Is it
expected?
Problem: high cpu, and hung process under dtrace when
calling for strlen. Somehow my sample program don’t crash, but the real
application crashes when I send ctrl+C to application running under dtrace.
PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND
25264 root 2 85 0 61268K 15244K RUN 0:26 43.99% dtrace
25265 root 1 47 0 10136K 1368K STOP 0:18 31.98% sample
Sample program
$ cat sample.c
#include <stdio.h>
#include <string.h>
int main (void) {
int i = 0;
for (; i < 3; i++) {
printf("calling strlen: %d\n", strlen("foobar"));
printf("calling strdup: %s\n", strdup("foobar"));
}
return 0;
}
The sample Makefile
$cat Makefile
CFLAGS=-I.
CFLAGS+=-fno-omit-frame-pointer -g
samplemake: sample.c
gcc -o
sample sample.c -I.
$
The sample D files
$ cat strdup.d
pid$target::strdup:return
{
trace (arg1);
}
$ cat strlen.d
pid$target::strlen:entry
{
trace (arg0);
}
$ date; dtrace -s strdup.d -c
/tmp/sample; date
Fri Sep 26 03:53:57 GMT 2014
dtrace: script 'strdup.d' matched 1 probe
calling strlen: 6
calling strdup: foobar
calling strlen: 6
calling strdup: foobar
calling strlen: 6
calling strdup: foobar
dtrace: pid 26100 has exited
CPU ID FUNCTION:NAME
0 32060 strdup:return 34372624480
0 32060 strdup:return 34372624488
0 32060 strdup:return 34372624496
Fri Sep 26 03:53:57 GMT 2014
$ date ; dtrace -s strlen.d -c /tmp/sample
; date
Fri Sep 26 03:54:04 GMT 2014
dtrace: script 'strlen.d' matched 1 probe
calling strlen: 6
CPU ID FUNCTION:NAME
0 32060 strlen:entry 4196103
^C
Fri Sep 26 03:56:42 GMT 2014
Any help will be really appreciated. I am having dtrace related
patches from firefox email chain < https://lists.freebsd.org/pipermail/freebsd-dtrace/2013-October/000107.html>.
This is an enterprise application and we cannot move to 10.0
release of freebsd at least for now
Thank you.
Madhava
From owner-freebsd-dtrace@FreeBSD.ORG Fri Sep 26 07:08:38 2014
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Date: Fri, 26 Sep 2014 00:08:31 -0700
From: Mark Johnston <markj@FreeBSD.org>
To: madhava gaikwad <alex_madhava@yahoo.com>
Subject: Re: [freebsd 9.2] dtrace causes hung process when called for strlen
Message-ID: <20140926070831.GA56476@charmander.Belkin>
References: <1411705375.19660.YahooMailNeo@web122002.mail.ne1.yahoo.com>
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On Thu, Sep 25, 2014 at 09:22:55PM -0700, madhava gaikwad via freebsd-dtrace wrote:
> Hello Experts,
>
> I am a freebsd newbie and having a strange issue on freebsd 9.2 (It is AMD64
> machine).I am not able to dtrace few libc functions. For example I am able to
> dtrace strdup, but calling dtrace for strlen causes hung process. It is 100 % percent repro-able. Is it
> expected?
Hi,
I'm not sure what the exact problem is in your case, but 9.2 is missing
a large number of fixes that have gone into userland DTrace support. Without
them, I don't expect it to work reliably. I suggest trying 9.3 or the
soon-to-be-released 10.1 instead. If you continue to run into problems
after upgrading, please let us know.
Thanks,
-Mark
>
> Problem: high cpu, and hung process under dtrace when
> calling for strlen. Somehow my sample program don’t crash, but the real
> application crashes when I send ctrl+C to application running under dtrace.
>
> PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND
> 25264 root 2 85 0 61268K 15244K RUN 0:26 43.99% dtrace
> 25265 root 1 47 0 10136K 1368K STOP 0:18 31.98% sample
>
> Sample program
> $ cat sample.c
> #include <stdio.h>
> #include <string.h>
>
> int main (void) {
> int i = 0;
> for (; i < 3; i++) {
> printf("calling strlen: %d\n", strlen("foobar"));
> printf("calling strdup: %s\n", strdup("foobar"));
> }
> return 0;
> }
>
> The sample Makefile
> $cat Makefile
> CFLAGS=-I.
> CFLAGS+=-fno-omit-frame-pointer -g
>
> samplemake: sample.c
> gcc -o
> sample sample.c -I.
> $
>
> The sample D files
> $ cat strdup.d
> pid$target::strdup:return
> {
> trace (arg1);
> }
> $ cat strlen.d
> pid$target::strlen:entry
> {
> trace (arg0);
> }
>
>
> $ date; dtrace -s strdup.d -c
> /tmp/sample; date
> Fri Sep 26 03:53:57 GMT 2014
> dtrace: script 'strdup.d' matched 1 probe
> calling strlen: 6
> calling strdup: foobar
> calling strlen: 6
> calling strdup: foobar
> calling strlen: 6
> calling strdup: foobar
> dtrace: pid 26100 has exited
> CPU ID FUNCTION:NAME
> 0 32060 strdup:return 34372624480
> 0 32060 strdup:return 34372624488
> 0 32060 strdup:return 34372624496
>
> Fri Sep 26 03:53:57 GMT 2014
> $ date ; dtrace -s strlen.d -c /tmp/sample
> ; date
> Fri Sep 26 03:54:04 GMT 2014
> dtrace: script 'strlen.d' matched 1 probe
> calling strlen: 6
> CPU ID FUNCTION:NAME
> 0 32060 strlen:entry 4196103
> ^C
>
> Fri Sep 26 03:56:42 GMT 2014
>
> Any help will be really appreciated. I am having dtrace related
> patches from firefox email chain < https://lists.freebsd.org/pipermail/freebsd-dtrace/2013-October/000107.html>.
>
> This is an enterprise application and we cannot move to 10.0
> release of freebsd at least for now
> Thank you.
> Madhava
> _______________________________________________
> freebsd-dtrace@freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-dtrace
> To unsubscribe, send any mail to "freebsd-dtrace-unsubscribe@freebsd.org"
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