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Report information
Id: 131859
Status: open
Priority: 0/
Queue: perl5

Owner: Nobody
Requestors: zefram [at] fysh.org
Cc:
AdminCc:

Operating System: (no value)
PatchStatus: (no value)
Severity: low
Type: core
Perl Version: 5.27.3
Fixed In: (no value)



To: perlbug [...] perl.org
Date: Tue, 08 Aug 2017 14:18:55 +0100
CC: zefram [...] fysh.org
From: zefram [...] fysh.org
Subject: bad core sub usage yields op assertion
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This is a bug report for perl from zefram@fysh.org, generated with the help of perlbug 1.40 running under perl 5.27.3. ----------------------------------------------------------------- [Please describe your issue here] $ perl -lwe 'BEGIN { *foo = \&CORE::uc; } print foo("wibble", "wobble")' perl: op.c:2696: S_finalize_op: Assertion `kid->op_sibparent == o' failed. zsh: abort perl -lwe Calls with the proper number of arguments work fine, calls with too many arguments produce the correct runtime error if compile-time checking is suppressed, and calls with too many arguments produce the correct compile-time error if they refer directly to CORE::uc(). The above problem only arises with compile-time checking via this indirection that reifies the CV. [Please do not change anything below this line] ----------------------------------------------------------------- --- Flags: category=core severity=low --- Site configuration information for perl 5.27.3: Configured by zefram at Tue Aug 8 11:38:55 BST 2017. Summary of my perl5 (revision 5 version 27 subversion 3) configuration: Derived from: 64bea4994c8916adaa922f965cf54badcd77fccb Platform: osname=linux osvers=3.16.0-4-amd64 archname=x86_64-linux-thread-multi uname='linux barba.rous.org 3.16.0-4-amd64 #1 smp debian 3.16.43-2+deb8u2 (2017-06-26) x86_64 gnulinux ' config_args='-des -Dprefix=/home/zefram/usr/perl/perl_install/perl-git-blead-i64-f52 -Duselargefiles -Dusethreads -Uafs -Ud_csh -Uusesfio -Uusenm -Duseshrplib -Dusedevel -Uversiononly -Ui_db -DDEBUGGING' hint=recommended useposix=true d_sigaction=define useithreads=define usemultiplicity=define use64bitint=define use64bitall=define uselongdouble=undef usemymalloc=n default_inc_excludes_dot=define bincompat5005=undef Compiler: cc='cc' ccflags ='-D_REENTRANT -D_GNU_SOURCE -fwrapv -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2' optimize='-O2 -g' cppflags='-D_REENTRANT -D_GNU_SOURCE -fwrapv -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include' ccversion='' gccversion='4.9.2' gccosandvers='' intsize=4 longsize=8 ptrsize=8 doublesize=8 byteorder=12345678 doublekind=3 d_longlong=define longlongsize=8 d_longdbl=define longdblsize=16 longdblkind=3 ivtype='long' ivsize=8 nvtype='double' nvsize=8 Off_t='off_t' lseeksize=8 alignbytes=8 prototype=define Linker and Libraries: ld='cc' ldflags =' -fstack-protector-strong -L/usr/local/lib' libpth=/usr/local/lib /usr/lib/gcc/x86_64-linux-gnu/4.9/include-fixed /usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib libs=-lpthread -lnsl -ldb -ldl -lm -lcrypt -lutil -lc perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc libc=libc-2.19.so so=so useshrplib=true libperl=libperl.so gnulibc_version='2.19' Dynamic Linking: dlsrc=dl_dlopen.xs dlext=so d_dlsymun=undef ccdlflags='-Wl,-E -Wl,-rpath,/home/zefram/usr/perl/perl_install/perl-git-blead-i64-f52/lib/5.27.3/x86_64-linux-thread-multi/CORE' cccdlflags='-fPIC' lddlflags='-shared -O2 -g -L/usr/local/lib -fstack-protector-strong' Locally applied patches: uncommitted-changes --- @INC for perl 5.27.3: /home/zefram/usr/perl/pg/lib /home/zefram/usr/perl/perl_install/perl-git-blead-i64-f52/lib/site_perl/5.27.3/x86_64-linux-thread-multi /home/zefram/usr/perl/perl_install/perl-git-blead-i64-f52/lib/site_perl/5.27.3 /home/zefram/usr/perl/perl_install/perl-git-blead-i64-f52/lib/5.27.3/x86_64-linux-thread-multi /home/zefram/usr/perl/perl_install/perl-git-blead-i64-f52/lib/5.27.3 /home/zefram/usr/perl/perl_install/perl-git-blead-i64-f52/lib/site_perl/5.27.2 /home/zefram/usr/perl/perl_install/perl-git-blead-i64-f52/lib/site_perl --- Environment for perl 5.27.3: HOME=/home/zefram LANG (unset) LANGUAGE (unset) LD_LIBRARY_PATH=/home/zefram/usr/perl/pg LOGDIR (unset) PATH=/home/zefram/usr/perl/util:/home/zefram/pub/x86_64-unknown-linux-gnu/bin:/home/zefram/pub/common/bin:/usr/bin:/bin:/usr/local/bin:/usr/games PERLDOC=-oman PERL_BADLANG (unset) SHELL=/usr/bin/zsh
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On Tue, 08 Aug 2017 06:19:14 -0700, zefram@fysh.org wrote: Show quoted text
> > This is a bug report for perl from zefram@fysh.org, > generated with the help of perlbug 1.40 running under perl 5.27.3. > > > ----------------------------------------------------------------- > [Please describe your issue here] > > $ perl -lwe 'BEGIN { *foo = \&CORE::uc; } print foo("wibble", > "wobble")' > perl: op.c:2696: S_finalize_op: Assertion `kid->op_sibparent == o' > failed. > zsh: abort perl -lwe > > Calls with the proper number of arguments work fine, calls with too > many > arguments produce the correct runtime error if compile-time checking > is suppressed, and calls with too many arguments produce the correct > compile-time error if they refer directly to CORE::uc(). The above > problem only arises with compile-time checking via this indirection > that > reifies the CV.
Interestingly, it only happens for unary ops, not nullary, or those with multiple arguments. -- Father Chrysostomos


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