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[perl #134045] Assertion failure in S_maybe_multideref (op.c:14912)
From:
Sergey Aleynikov
Date:
April 18, 2019 16:51
Subject:
[perl #134045] Assertion failure in S_maybe_multideref (op.c:14912)
Message ID:
rt-4.0.24-12230-1555606272-1029.134045-75-0@perl.org
# New Ticket Created by Sergey Aleynikov
# Please include the string: [perl #134045]
# in the subject line of all future correspondence about this issue.
# <URL: https://rt.perl.org/Ticket/Display.html?id=134045 >
This is a bug report for perl from sergey.aleynikov@gmail.com,
generated with the help of perlbug 1.41 running under perl 5.29.9.
-----------------------------------------------------------------
[Please describe your issue here]
While fuzzing perl v5.29.9-63-g2496d8f3f7 built with afl and run
under libdislocator, I found the following program
0for%{scalar local$0[0]}
to cause an assertion failure
perl: op.c:14912: void S_maybe_multideref(OP *, OP *, UV, U8):
Assertion `n && n->op_type == OP_LEAVE' 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=0x55555592a9c3 "n && n->op_type == OP_LEAVE",
file=0x5555559247ae "op.c", line=14892, function=<optimized out>) at
assert.c:92
#3 0x00007ffff7c330f2 in __GI___assert_fail (assertion=0x55555592a9c3
"n && n->op_type == OP_LEAVE", file=0x5555559247ae "op.c", line=14892,
function=0x55555592ccc0 <__PRETTY_FUNCTION__.22939>
"S_maybe_multideref") at assert.c:101
#4 0x00005555555deedc in S_maybe_multideref (start=0x555555b79648,
orig_o=0x555555b795c8, orig_action=6, hints=0 '\000') at op.c:14892
#5 0x00005555555e0146 in Perl_rpeep (o=0x555555b79648) at op.c:15545
#6 0x00005555555e37da in Perl_peep (o=0x555555b7b358) at op.c:16627
#7 0x00005555555ac110 in S_process_optree (cv=0x0,
optree=0x555555b7b390, start=0x555555b7b358) at op.c:3459
#8 0x00005555555b3f02 in Perl_newPROG (o=0x555555b7b390) at op.c:5413
#9 0x000055555566c1b0 in Perl_yyparse (gramtype=258) at perly.y:125
#10 0x00005555555ec726 in S_parse_body (env=0x0, xsinit=0x5555555a11f8
<xs_init>) at perl.c:2531
#11 0x00005555555ea9f8 in perl_parse (my_perl=0x555555b4e260,
xsinit=0x5555555a11f8 <xs_init>, argc=3, argv=0x7fffffffe1b8, env=0x0)
at perl.c:1822
#12 0x00005555555a113b in main (argc=3, argv=0x7fffffffe1b8,
env=0x7fffffffe1d8) at perlmain.c:126
This is a regression between 5.20 and 5.22, bisect points to
commit fedf30e1c349130b23648c022f5f3cb4ad7928f3
Author: David Mitchell <davem@iabyn.com>
Date: Fri Oct 24 16:26:38 2014 +0100
Add OP_MULTIDEREF
This op is an optimisation for any series of one or more array or hash
lookups and dereferences, where the key/index is a simple constant or
package/lexical variable. If the first-level lookup is of a simple
array/hash variable or scalar ref, then that is included in the op too.
[Please do not change anything below this line]
-----------------------------------------------------------------
---
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
-
[perl #134045] Assertion failure in S_maybe_multideref (op.c:14912)
by Sergey Aleynikov