Date: Fri, 26 Sep 2014 06:58:44 -0700 From: madhava gaikwad <alex_madhava@yahoo.com> To: Mark Johnston <markj@FreeBSD.org> Cc: "freebsd-dtrace@freebsd.org" <freebsd-dtrace@freebsd.org> Subject: Re: [freebsd 9.2] dtrace causes hung process when called for strlen Message-ID: <1411739924.65670.YahooMailNeo@web122006.mail.ne1.yahoo.com> In-Reply-To: <20140926070831.GA56476@charmander.Belkin> References: <1411705375.19660.YahooMailNeo@web122002.mail.ne1.yahoo.com> <20140926070831.GA56476@charmander.Belkin>
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Thanks for the reply Mark. So in Nutshell, 9.2 is not the version completel=
y supporting dtrace functionality. I am not sure if I can get next freebsd =
version for my product that quick. I will try to add more debugs into those=
functions and will see if I can get anything in short time. =0A=0AAgain t=
hanks for your help and pointers.=0A=0ACheers,=0AMadhava=0A=0A=0AOn Friday,=
September 26, 2014 12:38 PM, Mark Johnston <markj@FreeBSD.org> wrote:=0A =
=0A=0A=0AOn Thu, Sep 25, 2014 at 09:22:55PM -0700, madhava gaikwad via free=
bsd-dtrace wrote:=0A> Hello Experts,=0A> =0A> I am a freebsd newbie and ha=
ving a strange issue on freebsd 9.2 (It is AMD64=0A> machine).I am not able=
to dtrace few libc functions. For example I am able to=0A> dtrace strdup, =
but calling dtrace for strlen causes hung process. It is 100 % percent repr=
o-able. Is it=0A> expected?=0A=0AHi,=0A=0AI'm not sure what the exact probl=
em is in your case, but 9.2 is missing=0Aa large number of fixes that have =
gone into userland DTrace support. Without=0Athem, I don't expect it to wor=
k reliably. I suggest trying 9.3 or the=0Asoon-to-be-released 10.1 instead.=
If you continue to run into problems=0Aafter upgrading, please let us know=
.=0A=0AThanks,=0A-Mark=0A=0A=0A> =0A> Problem: high cpu, and hung process =
under dtrace when=0A> calling for strlen. Somehow my sample program don=E2=
=80=99t crash, but the real=0A> application crashes when I send ctrl+C to a=
pplication running under dtrace.=0A> =0A> PID USERNAME THR PRI NIC=
E SIZE RES STATE TIME WCPU COMMAND=0A> 25264 root 2 =
85 0 61268K 15244K RUN 0:26 43.99% dtrace=0A> 25265 root =
1 47 0 10136K 1368K STOP 0:18 31.98% sample=0A> =0A> Sample pro=
gram =0A> $ cat sample.c=0A> #include <stdio.h>=0A> #include <string.h>=0A>=
=0A> int main (void) {=0A> int i =3D 0;=0A> for (; i < 3; i++) {=0A> =
printf("calling strlen: %d\n", strlen("foobar"));=0A> printf("c=
alling strdup: %s\n", strdup("foobar"));=0A> }=0A> return 0;=0A> }=
=0A> =0A> The sample Makefile=0A> $cat Makefile=0A> CFLAGS=3D-I.=0A> CFLAG=
S+=3D-fno-omit-frame-pointer -g=0A> =0A> samplemake: sample.c=0A> =
gcc -o=0A> sample sample.c -I.=0A> $=0A> =0A> The sample D files=0A> =
$ cat strdup.d=0A> pid$target::strdup:return=0A> {=0A> trace (arg1);=0A>=
}=0A> $ cat strlen.d=0A> pid$target::strlen:entry=0A> {=0A> trace (arg0=
);=0A> }=0A> =0A> =0A> $ date; dtrace -s strdup.d -c=0A> /tmp/sample; dat=
e=0A> Fri Sep 26 03:53:57 GMT 2014=0A> dtrace: script 'strdup.d' matched 1 =
probe=0A> calling strlen: 6=0A> calling strdup: foobar=0A> calling strlen: =
6=0A> calling strdup: foobar=0A> calling strlen: 6=0A> calling strdup: foob=
ar=0A> dtrace: pid 26100 has exited=0A> CPU ID FUNCT=
ION:NAME=0A> 0 32060 strdup:return 34372624480=
=0A> 0 32060 strdup:return 34372624488=0A> 0 =
32060 strdup:return 34372624496=0A> =0A> Fri Sep=
26 03:53:57 GMT 2014=0A> $ date ; dtrace -s strlen.d -c /tmp/sample=0A> ; =
date=0A> Fri Sep 26 03:54:04 GMT 2014=0A> dtrace: script 'strlen.d' matched=
1 probe=0A> calling strlen: 6=0A> CPU ID FUNCTION:N=
AME=0A> 0 32060 strlen:entry 4196103=0A> ^=
C=0A> =0A> Fri Sep 26 03:56:42 GMT 2014=0A> =0A> Any help will be really =
appreciated. I am having dtrace related=0A> patches from firefox email chai=
n < https://lists.freebsd.org/pipermail/freebsd-dtrace/2013-October/000107.=
html>. =0A> =0A> This is an enterprise application and we cannot move to 1=
0.0=0A> release of freebsd at least for now=0A> Thank you.=0A> Madhava=0A> =
_______________________________________________=0A> freebsd-dtrace@freebsd.=
org mailing list=0A> https://lists.freebsd.org/mailman/listinfo/freebsd-dtr=
ace=0A> To unsubscribe, send any mail to "freebsd-dtrace-unsubscribe@freebs=
d.org=0A"
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From: "George Neville-Neil" <gnn@neville-neil.com>
To: "Mark Johnston" <markj@FreeBSD.org>
Subject: Re: WITH_CTF vs -g
Date: Fri, 26 Sep 2014 17:52:24 +0300
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On 26 Sep 2014, at 1:51, Mark Johnston wrote:
> On Wed, Sep 10, 2014 at 08:23:21PM +0300, Andriy Gapon wrote:
>>
>> In my opinion WITH_CTF should imply -g in CFLAGS otherwise, as far as I can see,
>> there is nothing to generate CTF data from. Forcing an end-user to remember to
>> additionally pass -g is not nice.
>>
>> Also, I think that we can always have -g in CTFFLAGS, because the stripping step
>> takes care of the original DWARF data in any case. But I am not 100% sure about
>> this.
>>
>> What do you think?
>> Thanks!
>
> Hi Andriy,
>
> Are you planning to go through with this? I was just about to post this
> exact question, but then I remembered that you already have. :)
>
> FWIW, the diff I have in mind is below. It also removes some checks that
> I think are unnecessary from bsd.{lib,prog}.mk. It is not fully tested,
> but seems to work for me. I'm also not sure about unconditionally
> passing -g to ctfconvert and ctfmerge.
>
Mark,
Can you put this up in Phabricator? reviews.freebsd.org
Best,
George
> Thanks,
> -Mark
>
> diff --git a/share/mk/bsd.lib.mk b/share/mk/bsd.lib.mk
> index f0acf16..c6b689d 100644
> --- a/share/mk/bsd.lib.mk
> +++ b/share/mk/bsd.lib.mk
> @@ -36,7 +36,7 @@ NO_WERROR=
> .if defined(DEBUG_FLAGS)
> CFLAGS+= ${DEBUG_FLAGS}
>
> -.if ${MK_CTF} != "no" && ${DEBUG_FLAGS:M-g} != ""
> +.if ${MK_CTF} != "no"
> CTFFLAGS+= -g
> .endif
> .else
> diff --git a/share/mk/bsd.own.mk b/share/mk/bsd.own.mk
> index 486914b..32556a1 100644
> --- a/share/mk/bsd.own.mk
> +++ b/share/mk/bsd.own.mk
> @@ -128,6 +128,7 @@ __<bsd.own.mk>__:
>
> .if ${MK_CTF} != "no"
> CTFCONVERT_CMD= ${CTFCONVERT} ${CTFFLAGS} ${.TARGET}
> +DEBUG_FLAGS?= -g
> .elif defined(.PARSEDIR) || (defined(MAKE_VERSION) && ${MAKE_VERSION} >= 5201111300)
> CTFCONVERT_CMD=
> .else
> diff --git a/share/mk/bsd.prog.mk b/share/mk/bsd.prog.mk
> index 340950a..e4f7104 100644
> --- a/share/mk/bsd.prog.mk
> +++ b/share/mk/bsd.prog.mk
> @@ -20,7 +20,7 @@ NO_WERROR=
> CFLAGS+=${DEBUG_FLAGS}
> CXXFLAGS+=${DEBUG_FLAGS}
>
> -.if ${MK_CTF} != "no" && ${DEBUG_FLAGS:M-g} != ""
> +.if ${MK_CTF} != "no"
> CTFFLAGS+= -g
> .endif
> .endif
> _______________________________________________
> freebsd-dtrace@freebsd.org mailing list
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