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,=0A =0AI am a freebsd newbie and having a strange issue on fr= eebsd 9.2 (It is AMD64=0Amachine).I am not able to dtrace few libc function= s. For example I am able to=0Adtrace strdup, but calling dtrace for strlen = causes hung process. It is 100 % percent repro-able. Is it=0Aexpected?=0A = =0AProblem: high cpu, and hung process under dtrace when=0Acalling for strl= en. Somehow my sample program don=E2=80=99t crash, but the real=0Aapplicati= on crashes when I send ctrl+C to application running under dtrace.=0A =0A = PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND= =0A25264 root 2 85 0 61268K 15244K RUN 0:26 43.99% dtr= ace=0A25265 root 1 47 0 10136K 1368K STOP 0:18 31.98% = sample=0A =0ASample program =0A$ cat sample.c=0A#include <stdio.h>=0A#inclu= de <string.h>=0A =0Aint main (void) {=0Aint i =3D 0;=0Afor (; i < 3; i++) {= =0A printf("calling strlen: %d\n", strlen("foobar"));=0A prin= tf("calling strdup: %s\n", strdup("foobar"));=0A }=0A return 0;=0A}= =0A =0AThe sample Makefile=0A$cat Makefile=0ACFLAGS=3D-I.=0ACFLAGS+=3D-fno-= omit-frame-pointer -g=0A =0Asamplemake: sample.c=0A gcc -o=0Asa= mple sample.c -I.=0A$=0A =0AThe sample D files=0A$ cat strdup.d=0Apid$targe= t::strdup:return=0A{=0A trace (arg1);=0A}=0A$ cat strlen.d=0Apid$target::= strlen:entry=0A{=0A trace (arg0);=0A}=0A =0A =0A$ date; dtrace -s strdup.= d -c=0A/tmp/sample; date=0AFri Sep 26 03:53:57 GMT 2014=0Adtrace: script 's= trdup.d' matched 1 probe=0Acalling strlen: 6=0Acalling strdup: foobar=0Acal= ling strlen: 6=0Acalling strdup: foobar=0Acalling strlen: 6=0Acalling strdu= p: foobar=0Adtrace: pid 26100 has exited=0ACPU ID FU= NCTION:NAME=0A 0 32060 strdup:return 34372624480= =0A 0 32060 strdup:return 34372624488=0A 0 320= 60 strdup:return 34372624496=0A =0AFri Sep 26 03:5= 3:57 GMT 2014=0A$ date ; dtrace -s strlen.d -c /tmp/sample=0A; date=0AFri S= ep 26 03:54:04 GMT 2014=0Adtrace: script 'strlen.d' matched 1 probe=0Acalli= ng strlen: 6=0ACPU ID FUNCTION:NAME=0A 0 32060 = strlen:entry 4196103=0A^C=0A =0AFri Sep 26 03:56= :42 GMT 2014=0A =0AAny help will be really appreciated. I am having dtrace = related=0Apatches from firefox email chain < https://lists.freebsd.org/pipe= rmail/freebsd-dtrace/2013-October/000107.html>. =0A =0AThis is an enterpris= e application and we cannot move to 10.0=0Arelease of freebsd at least for = now=0AThank you.=0AMadhava=0A From owner-freebsd-dtrace@FreeBSD.ORG Fri Sep 26 07:08:38 2014 Return-Path: <owner-freebsd-dtrace@FreeBSD.ORG> Delivered-To: freebsd-dtrace@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 2DCCF659 for <freebsd-dtrace@freebsd.org>; Fri, 26 Sep 2014 07:08:38 +0000 (UTC) Received: from mail-pd0-x229.google.com (mail-pd0-x229.google.com [IPv6:2607:f8b0:400e:c02::229]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id F3E03823 for <freebsd-dtrace@freebsd.org>; Fri, 26 Sep 2014 07:08:37 +0000 (UTC) Received: by mail-pd0-f169.google.com with SMTP id p10so430181pdj.0 for <freebsd-dtrace@freebsd.org>; Fri, 26 Sep 2014 00:08:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:content-transfer-encoding :in-reply-to:user-agent; bh=JWVqRJmSTitQyD/P/W3qhxY0b+or+ltdKMwkqgUkNp0=; b=Jy6UeezNGCv9D8DhGTeXP/NTmm3r0lkfJztERB/EZyG5/6Pu0ldIFMGtRN+4jWsoSx FPqZ3csWqKreX1rzQ8x9eWZRYfrAgonxZtM9vnB74xK3XiQSv/XrvavowuhIu/w/Wxur wQL73ERw5TzeVVziDXSr8eTr9jR5StNCOUOVHbEGDMB7yxiQr0V2V4Q5cyLv3VLYIfvz w7IvL+WAl3+51yIM/Ij5EFVO/pBQ/brdAiip5bF85KFQ9z1fI77bNUcgxDN3/sr2P3cy noYjDDJJP+UXdyBF5Fk0/sNTIhsYwjb7aKgD4hHNUcNOO4OsNH9YFEteXtdCRKHoyMx3 3JEg== X-Received: by 10.69.29.43 with SMTP id jt11mr15297338pbd.92.1411715317344; Fri, 26 Sep 2014 00:08:37 -0700 (PDT) Received: from charmander.Belkin (c-66-235-3-150.sea.wa.customer.broadstripe.net. [66.235.3.150]) by mx.google.com with ESMTPSA id ah7sm3993546pbd.52.2014.09.26.00.08.36 for <multiple recipients> (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 26 Sep 2014 00:08:36 -0700 (PDT) Sender: Mark Johnston <markjdb@gmail.com> 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> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1411705375.19660.YahooMailNeo@web122002.mail.ne1.yahoo.com> User-Agent: Mutt/1.5.23 (2014-03-12) Cc: "freebsd-dtrace@freebsd.org" <freebsd-dtrace@freebsd.org> X-BeenThere: freebsd-dtrace@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "A discussion list for developers working on DTrace in FreeBSD." <freebsd-dtrace.freebsd.org> List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-dtrace>, <mailto:freebsd-dtrace-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-dtrace/> List-Post: <mailto:freebsd-dtrace@freebsd.org> List-Help: <mailto:freebsd-dtrace-request@freebsd.org?subject=help> List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-dtrace>, <mailto:freebsd-dtrace-request@freebsd.org?subject=subscribe> X-List-Received-Date: Fri, 26 Sep 2014 07:08:38 -0000 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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