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[perl #127774] segfault in caller()
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From:
James E Keenan via RT
Date:
March 24, 2016 00:39
Subject:
[perl #127774] segfault in caller()
Message ID:
rt-4.0.18-6659-1458779937-1657.127774-15-0@perl.org
On Wed Mar 23 17:25:11 2016, mauke- wrote:
>
> This is a bug report for perl from l.mai@web.de,
> generated with the help of perlbug 1.40 running under perl 5.22.1.
>
>
> -----------------------------------------------------------------
> [Please describe your issue here]
>
> $ perl -e 'END { caller 1 } eval("sub { die }")->()'
> Died at (eval 1) line 1.
> Segmentation fault (core dumped)
>
> A threaded/debugging 5.22.1 segfaults at pp_ctl.c:1797:
> assert(CopSTASH(cx->blk_oldcop));
> because oldcop is NULL.
>
> This seems to be fixed in blead (probably due to the context stack
> overhaul?).
>
Confirmed that blead looks okay on non-threaded, non-debugging builds.
#####
$ ./perl -v | head -2 | tail -1
This is perl 5, version 23, subversion 10 (v5.23.10 (v5.23.9-14-g2ebde1c)) built for x86_64-linux
$ ./perl -e 'END { caller 1 } eval("sub { die }")->()'
Died at (eval 1) line 1.
#####
> If I used bisect.pl right, the crash was introduced with commit
> 515abc43ad7e359e9f2f1fedb73378c13fd16348 (Set PL_curcop to NULL in
> op.c:S_cop_free) between 5.18 and 5.20. ("Introduced" is probably
> wrong; more
> like "exposed".)
>
> It seems to consistently crash 5.20 and 5.22.
>
Ditto for me (unthreaded, non-debugging)
> [Please do not change anything below this line]
> -----------------------------------------------------------------
> ---
> Flags:
> category=core
> severity=low
> ---
> Site configuration information for perl 5.22.1:
>
> Configured by mauke at Tue Dec 29 15:36:05 CET 2015.
>
> Summary of my perl5 (revision 5 version 22 subversion 1)
> configuration:
>
> Platform:
> osname=linux, osvers=4.2.5-1-arch, archname=i686-linux
> uname='linux simplicio 4.2.5-1-arch #1 smp preempt tue oct 27
> 08:28:41 cet 2015 i686 gnulinux '
> config_args=''
> hint=recommended, useposix=true, d_sigaction=define
> useithreads=undef, usemultiplicity=undef
> use64bitint=undef, use64bitall=undef, uselongdouble=undef
> usemymalloc=n, bincompat5005=undef
> Compiler:
> cc='cc', ccflags ='-fwrapv -fno-strict-aliasing -pipe -fstack-
> protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE
> -D_FILE_OFFSET_BITS=64',
> optimize='-O2',
> cppflags='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-
> strong -I/usr/local/include'
> ccversion='', gccversion='5.3.0', gccosandvers=''
> intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234,
> doublekind=3
> d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12,
> longdblkind=3
> ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t',
> lseeksize=8
> alignbytes=4, prototype=define
> Linker and Libraries:
> ld='cc', ldflags =' -fstack-protector-strong -L/usr/local/lib'
> libpth=/usr/local/lib /usr/lib/gcc/i686-pc-linux-gnu/5.3.0/include-
> fixed /usr/lib /lib
> libs=-lpthread -lnsl -lnm -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc
> -lgdbm_compat
> perllibs=-lpthread -lnsl -lnm -ldl -lm -lcrypt -lutil -lc
> libc=libc-2.22.so, so=so, useshrplib=false, libperl=libperl.a
> gnulibc_version='2.22'
> Dynamic Linking:
> dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
> cccdlflags='-fPIC', lddlflags='-shared -O2 -L/usr/local/lib -fstack-
> protector-strong'
>
>
> ---
> @INC for perl 5.22.1:
> /home/mauke/usr/lib/perl5/site_perl/5.22.1/i686-linux
> /home/mauke/usr/lib/perl5/site_perl/5.22.1
> /home/mauke/usr/lib/perl5/5.22.1/i686-linux
> /home/mauke/usr/lib/perl5/5.22.1
> .
>
> ---
> Environment for perl 5.22.1:
> HOME=/home/mauke
> LANG=en_US.UTF-8
> LANGUAGE=en_US
> LC_COLLATE=C
> LC_MONETARY=de_DE.UTF-8
> LC_TIME=de_DE.UTF-8
> LD_LIBRARY_PATH (unset)
> LOGDIR (unset)
> PATH=/home/mauke/perl5/perlbrew/bin:/home/mauke/bin:/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl
> PERLBREW_BASHRC_VERSION=0.73
> PERLBREW_HOME=/home/mauke/.perlbrew
> PERLBREW_ROOT=/home/mauke/perl5/perlbrew
> PERL_BADLANG (unset)
> PERL_UNICODE=SAL
> SHELL=/bin/bash
--
James E Keenan (jkeenan@cpan.org)
---
via perlbug: queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=127774
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