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Assertion failure in Perl_sv_sethek (sv.c:5038) #16866

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p5pRT opened this issue Mar 3, 2019 · 1 comment
Open

Assertion failure in Perl_sv_sethek (sv.c:5038) #16866

p5pRT opened this issue Mar 3, 2019 · 1 comment

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@p5pRT
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p5pRT commented Mar 3, 2019

Migrated from rt.perl.org#133884 (status was 'new')

Searchable as RT133884$

@p5pRT
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p5pRT commented Mar 3, 2019

From @dur-randir

Created by @dur-randir

While fuzzing perl v5.29.8-21-gde59f38ed9 built with afl and run
under libdislocator, I found the following program

s/((?{caller}))//;foreach $_ (0){foo()}sub foo{//}

to cause an assertion failure​:

perl​: sv.c​:5038​: void Perl_sv_sethek(SV *const, const HEK *const)​:
Assertion `sv' failed.

GDB stack trace is following​:

#0 __GI_raise (sig=sig@​entry=6) at ../sysdeps/unix/sysv/linux/raise.c​:50
#1 0x00007ffff7c25535 in __GI_abort () at abort.c​:79
#2 0x00007ffff7c2540f in __assert_fail_base (fmt=0x7ffff7d87ee0
"%s%s%s​:%u​: %s%sAssertion `%s' failed.\n%n", assertion=0x555555a892ce
"sv",
  file=0x555555a89860 "sv.c", line=5038, function=<optimized out>)
at assert.c​:92
#3 0x00007ffff7c330f2 in __GI___assert_fail (assertion=0x555555a892ce
"sv", file=0x555555a89860 "sv.c", line=5038,
  function=0x555555a9c2b8 <__PRETTY_FUNCTION__.20568>
"Perl_sv_sethek") at assert.c​:101
#4 0x00005555557951ca in Perl_sv_sethek (sv=0x0, hek=0x555555b383d8)
at sv.c​:5038
#5 0x000055555581b80f in Perl_pp_caller () at pp_ctl.c​:1909
#6 0x00005555556f692d in Perl_runops_debug () at dump.c​:2537
#7 0x00005555558a701e in S_regmatch (reginfo=0x7fffffffdd00,
startpos=0x555555b53510 "0", prog=0x555555b533dc) at regexec.c​:7321
#8 0x0000555555899513 in S_regtry (reginfo=0x7fffffffdd00,
startposp=0x7fffffffdac8) at regexec.c​:3933
#9 0x0000555555898e7e in Perl_regexec_flags (rx=0x555555b4b520,
stringarg=0x555555b53510 "0", strend=0x555555b53511 "",
strbeg=0x555555b53510 "0",
  minend=0, sv=0x555555b4b5c8, data=0x0, flags=97) at regexec.c​:3790
#10 0x0000555555754e89 in Perl_pp_match () at pp_hot.c​:3018
#11 0x00005555556f692d in Perl_runops_debug () at dump.c​:2537
#12 0x00005555555da124 in S_run_body (oldscope=1) at perl.c​:2692
#13 0x00005555555d96a2 in perl_run (my_perl=0x555555b24260) at perl.c​:2615
#14 0x000055555558e12e in main (argc=2, argv=0x7fffffffe1e8,
env=0x7fffffffe200) at perlmain.c​:127

This is a regression between 5.18 and 5.20, bisect points to

commit ce0d59f
Author​: Father Chrysostomos <sprout@​cpan.org>
Date​: Tue Jul 2 13​:07​:45 2013 -0700

  [perl #7508] Use NULL for nonexistent array elems

  This commit fixes bug #7508 and provides the groundwork for fixing
  several other bugs.

Perl Info

Flags:
    category=core
    severity=low

Site configuration information for perl 5.29.9:

Configured by dur-randir at Wed Feb 27 14:51:01 MSK 2019.

Summary of my perl5 (revision 5 version 29 subversion 9) configuration:
  Commit id: c1e47bad34ce1d9c84ed57c9b8978bcbd5a02e98
  Platform:
    osname=darwin
    osvers=13.4.0
    archname=darwin-thread-multi-2level
    uname='darwin isengard.local 13.4.0 darwin kernel version 13.4.0:
mon jan 11 18:17:34 pst 2016; root:xnu-2422.115.15~1release_x86_64
x86_64 '
    config_args='-de -Dusedevel -DDEBUGGING -Dusethreads'
    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 ='-fno-common -DPERL_DARWIN -mmacosx-version-min=10.9
-DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector
-I/usr/local/include -DPERL_USE_SAFE_PUTENV'
    optimize='-O3 -g'
    cppflags='-fno-common -DPERL_DARWIN -mmacosx-version-min=10.9
-DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector
-I/usr/local/include'
    ccversion=''
    gccversion='4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.56)'
    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 =' -mmacosx-version-min=10.9 -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/6.0/lib
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib
/usr/lib
    libs=-lpthread -lgdbm -ldbm -ldl -lm -lutil -lc
    perllibs=-lpthread -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=' -mmacosx-version-min=10.9 -bundle -undefined
dynamic_lookup -L/usr/local/lib -fstack-protector'



@INC for perl 5.29.9:
    lib
    /usr/local/lib/perl5/site_perl/5.29.9/darwin-thread-multi-2level
    /usr/local/lib/perl5/site_perl/5.29.9
    /usr/local/lib/perl5/5.29.9/darwin-thread-multi-2level
    /usr/local/lib/perl5/5.29.9


Environment for perl 5.29.9:
    DYLD_LIBRARY_PATH (unset)
    HOME=/Users/dur-randir
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/Users/dur-randir/perlbrew/bin:/Users/dur-randir/perlbrew/perls/perl-5.22.1/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/texbin
    PERLBREW_HOME=/Users/dur-randir/.perlbrew
    PERLBREW_MANPATH=/Users/dur-randir/perlbrew/perls/perl-5.22.1/man
    PERLBREW_PATH=/Users/dur-randir/perlbrew/bin:/Users/dur-randir/perlbrew/perls/perl-5.22.1/bin
    PERLBREW_PERL=perl-5.22.1
    PERLBREW_ROOT=/Users/dur-randir/perlbrew
    PERLBREW_SHELLRC_VERSION=0.84
    PERLBREW_VERSION=0.84
    PERL_BADLANG (unset)
    SHELL=/usr/local/bin/zsh

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