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[perl #118305] dtrace sub-entry probe against lexical sub segfaults

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From:
Ricardo SIGNES
Date:
June 4, 2013 18:49
Subject:
[perl #118305] dtrace sub-entry probe against lexical sub segfaults
Message ID:
rt-3.6.HEAD-2552-1370371718-125.118305-75-0@perl.org
# New Ticket Created by  Ricardo SIGNES 
# Please include the string:  [perl #118305]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=118305 >


This is a bug report for perl from rjbs@cpan.org,
generated with the help of perlbug 1.39 running under perl 5.19.1.


-----------------------------------------------------------------
[Please describe your issue here]

I have compiled blead (929c6ecf) -Dusedtrace and run:

  ./perl -Ilib  -E 'use feature "lexical_subs"; my sub x { say 1 }
    while (1) { sleep 1; x; }'

This starts emitting a slow steady stream of ones.  It is just fine.

After a while, I run:

  sudo dtrace -Zn 'perl::sub-entry /execname == "perl"/ { }'
  dtrace: description 'perl::sub-entry ' matched 4 probes

The original perl program segfaults within a second.

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=medium
---
Site configuration information for perl 5.19.1:

Configured by rjbs at Tue Jun  4 13:37:13 CDT 2013.

Summary of my perl5 (revision 5 version 19 subversion 1) configuration:
  Commit id: 929c6ecf94db1e29600848f3d1acc64c825d9fc7
  Platform:
    osname=darwin, osvers=12.3.0, archname=darwin-2level
    uname='darwin walrus.local 12.3.0 darwin kernel version 12.3.0: sun jan 6 22:37:10 pst 2013; root:xnu-2050.22.13~1release_x86_64 x86_64 '
    config_args='-des -Dusedevel -Dusedtrace'
    hint=previous, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-fno-common -DPERL_DARWIN -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -I/opt/local/include',
    optimize='-O3',
    cppflags='-fno-common -DPERL_DARWIN -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -I/opt/local/include -fno-common -DPERL_DARWIN -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -I/opt/local/include'
    ccversion='', gccversion='4.2.1 Compatible Apple Clang 4.0 ((tags/Apple/clang-421.0.57))', gccosandvers=''
    intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='env MACOSX_DEPLOYMENT_TARGET=10.3 cc', ldflags =' -fstack-protector -L/usr/local/lib -L/opt/local/lib'
    libpth=/usr/local/lib /opt/local/lib /usr/lib
    libs=-lgdbm -ldbm -ldl -lm -lutil -lc
    perllibs=-ldl -lm -lutil -lc
    libc=, so=dylib, useshrplib=false, libperl=libperl.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=bundle, d_dlsymun=undef, ccdlflags=' '
    cccdlflags=' ', lddlflags=' -bundle -undefined dynamic_lookup -L/usr/local/lib -L/opt/local/lib -fstack-protector'

Locally applied patches:
    

---
@INC for perl 5.19.1:
    lib
    /Users/rjbs/.perlbrew/libs/19.0@std/lib/perl5/darwin-2level
    /Users/rjbs/.perlbrew/libs/19.0@std/lib/perl5
    /usr/local/lib/perl5/site_perl/5.19.1/darwin-2level
    /usr/local/lib/perl5/site_perl/5.19.1
    /usr/local/lib/perl5/5.19.1/darwin-2level
    /usr/local/lib/perl5/5.19.1
    .

---
Environment for perl 5.19.1:
    DYLD_LIBRARY_PATH (unset)
    HOME=/Users/rjbs
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/Users/rjbs/.perlbrew/libs/19.0@std/bin:/Users/rjbs/perl5/perlbrew/bin:/Users/rjbs/perl5/perlbrew/perls/19.0/bin:/Users/rjbs/bin:/opt/local/bin:/opt/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/X11/bin:/Users/rjbs/code/hla
    PERL5LIB=/Users/rjbs/.perlbrew/libs/19.0@std/lib/perl5
    PERLBREW_BASHRC_VERSION=0.63
    PERLBREW_HOME=/Users/rjbs/.perlbrew
    PERLBREW_LIB=std
    PERLBREW_MANPATH=/Users/rjbs/.perlbrew/libs/19.0@std/man:/Users/rjbs/perl5/perlbrew/perls/19.0/man
    PERLBREW_PATH=/Users/rjbs/.perlbrew/libs/19.0@std/bin:/Users/rjbs/perl5/perlbrew/bin:/Users/rjbs/perl5/perlbrew/perls/19.0/bin
    PERLBREW_PERL=19.0
    PERLBREW_ROOT=/Users/rjbs/perl5/perlbrew
    PERLBREW_VERSION=0.63
    PERLDOC=-n/opt/local/bin/groff
    PERL_AUTOINSTALL=--skipdeps
    PERL_BADLANG (unset)
    PERL_LOCAL_LIB_ROOT=/Users/rjbs/.perlbrew/libs/19.0@std
    PERL_MAILERS=sendmail:/Users/rjbs/bin/sendmail
    PERL_MB_OPT=--install_base /Users/rjbs/.perlbrew/libs/19.0@std
    PERL_MM_OPT=INSTALL_BASE=/Users/rjbs/.perlbrew/libs/19.0@std
    SHELL=/opt/local/bin/zsh


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