perl segfaults when parsing script

amphiplex has asked for the wisdom of the Perl Monks concerning the following question:

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Re: perl segfaults when parsing script by Joost (Canon) on Jun 27, 2002 at 14:13 UTC
I tried `perl -e'chop string;'` [download] This segfaults with `5.6.1 / i386-linux` but not on `5.8.0 RC2 / i686-linux-thread-multi-64all-ld` On that machine it (rightly) gives: `Can't modify constant item in chop at -e line 1, near "string;"` [download] So, yes it is a bug, and in fact it is 2 bugs: you should ofcourse be using `chop $string;` `-- Joost downtime n. The period during which a system is error-free and immune from user input.` [download]	[reply] [d/l] [select]
Re: perl segfaults when parsing script by ariels (Curate) on Jun 27, 2002 at 12:14 UTC
No, I've not. In fact, I just tried it with both perl 5.005_03 and perl 5.6.1 on sun4-solaris, and could get no segfault: `<bioserv 117 [15:14] ~ >perl -e 'chop $x' <bioserv 118 [15:14] ~ >perl -e 'chop FOO' Can't modify constant item in chop at -e line 1, at EOF Execution of -e aborted due to compilation errors. <bioserv 119 [15:14] ~ >perl -e 'chop "BAR"' Can't modify constant item in chop at -e line 1, at EOF Execution of -e aborted due to compilation errors. <bioserv 120 [15:14] ~ >perl -v This is perl, version 5.005_03 built for sun4-solaris` [download] (Similar results for 5.6.1 dropped) Of course, I didn't have access to your program which segfaults perl. It could be helpful to give a minimal example which fails (= something I can try to run on my machine), as well as the output of "`perl -V`".	[reply] [d/l] [select]
Re: Re: perl segfaults when parsing script by amphiplex (Monk) on Jun 27, 2002 at 12:31 UTC
That's interesting. Some cases where I get segfaults: ======= v5.6.1 built for i586-linux, on Linux central 2.4.18 #9 SMP `kurt@central:~> perl -e 'chop foo' Segmentation fault` [download] ======= v5.6.1 built for sun4-solaris, on SunOS xxxx 5.8 Generic_108528-14 sun4u sparc SUNW,Sun-Fire `[xxxxx: ~] perl -e 'chop foo' Modification of a read-only value attempted. Segmentation Fault (core dumped)` [download] ======= v5.6.1 built for alpha-dec_osf, on OSF1 xxxx V4.0 1229 alpha `[xxxxx: ~] perl -e 'chop foo' Segmentation fault (core dumped)` [download] ======= v5.6.1 built for PA-RISC1.1, on HP-UX xxxx B.11.11 U 9000/800 `yyyy@xxxx:¨> perl -e 'chop foo' Modification of a read-only value attempted. Bus error(coredump)` [download] ----- kurt	[reply] [d/l] [select]
Re: Re: Re: perl segfaults when parsing script by ariels (Curate) on Jun 27, 2002 at 12:39 UTC
Strange... "`perl -e 'chop foo'`" dumps core on "perl, v5.6.1 built for i686-linux", "perl, v5.6.1 built for IP27-irix", and "perl, v5.6.1 built for alpha-dec_osf" (except there it also manages to print an error message "Modification of a read-only value attempted." before it dies horribly). Not on "perl, v5.6.1 built for sun4-solaris", though. I've compared configs, and I can't find anything distinctively different that would cause sun4-solaris to survive. perlbug.	[reply] [d/l]
Re: perl segfaults when parsing script by demerphq (Chancellor) on Jun 27, 2002 at 13:27 UTC
Doesnt seem to affect the AS/Win32 builds.... `D:\Development>perl -v This is perl, v5.6.1 built for MSWin32-x86-multi-thread (with 1 registered patch, see perl -V for more detail) Copyright 1987-2001, Larry Wall Binary build 633 provided by ActiveState Corp. http://www.ActiveState. +com Built 21:33:05 Jun 17 2002 ... D:\Development>perl -e "chop string;" Can't modify constant item in chop at -e line 1, near "string;" Execution of -e aborted due to compilation errors.` [download] and `E:\>perl58 -v This is perl, v5.8.0 built for MSWin32-x86-multi-thread (with 1 registered patch, see perl -V for more detail) ... E:\>perl58 -e "chop string" Can't modify constant item in chop at -e line 1, at EOF Execution of -e aborted due to compilation errors.` [download] Yves / DeMerphq --- Writing a good benchmark isnt as easy as it might look.	[reply] [d/l] [select]