| CC: | ajs [...] ajs.com |
| Subject: | Math::BigInt::GMP vs threads segfault |
The following example demonstrates Math::BigInt::GMP causing a segfault
when run in multiple threads on my Ubuntu 9.04 system with perl 5.10.0
built for i486-linux-gnu-thread-multi:
$ perl -MMath::BigInt=lib,GMP -Mthreads -le 'async {
$n=Math::BigInt->new(2)->bexp(100)->bmodpow(2,80); } for 1..10; map
{$_->join()} threads->list(threads::joinable) while threads->list() > 0'
Segmentation fault
This seems to alternate between segfaults and a glibc error in a
non-deterministic way:
*** glibc detected *** perl: double free or corruption (!prev):
0x09873710 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7dda604]
/lib/tls/i686/cmov/libc.so.6(cfree+0x96)[0xb7ddc5b6]
/usr/lib/perl5/auto/Math/BigInt/GMP/GMP.so(XS_Math__BigInt__GMP_DESTROY+0x182)[0xb7c06272]
perl(Perl_pp_entersub+0x552)[0x80b3c92]
perl(Perl_call_sv+0x508)[0x80afc18]
perl(Perl_sv_clear+0x136)[0x80c6226]
perl(Perl_sv_free2+0x4a)[0x80c696a]
perl(Perl_sv_clear+0x3c4)[0x80c64b4]
perl(Perl_sv_free2+0x4a)[0x80c696a]
perl(Perl_hv_free_ent+0x33)[0x80a40c3]
perl[0x80a5277]
perl(Perl_hv_undef+0x141)[0x80a6fd1]
perl(Perl_sv_clear+0x5c6)[0x80c66b6]
perl(Perl_sv_free2+0x4a)[0x80c696a]
perl(Perl_sv_clear+0x3c4)[0x80c64b4]
perl(Perl_sv_free2+0x4a)[0x80c696a]
perl(Perl_free_tmps+0x52)[0x80e1492]
perl(Perl_pp_nextstate+0x45)[0x80b50b5]
perl(Perl_runops_standard+0x19)[0x80b2069]
perl(perl_run+0x2e0)[0x80b04d0]
perl(main+0xed)[0x8063ebd]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5)[0xb7d81775]
perl[0x8063d31]
======= Memory map: ========
08048000-0817c000 r-xp 00000000 08:02 8151 /usr/bin/perl
0817c000-0817d000 r--p 00133000 08:02 8151 /usr/bin/perl
0817d000-0817f000 rw-p 00134000 08:02 8151 /usr/bin/perl
09560000-0a020000 rw-p 09560000 00:00 0 [heap]
b1800000-b1821000 rw-p b1800000 00:00 0
b1821000-b1900000 ---p b1821000 00:00 0
b1a00000-b1a26000 rw-p b1a00000 00:00 0
b1a26000-b1b00000 ---p b1a26000 00:00 0
b1bff000-b1c00000 ---p b1bff000 00:00 0
b1c00000-b2400000 rw-p b1c00000 00:00 0
b2400000-b2500000 rw-p b2400000 00:00 0
b25ff000-b2600000 ---p b25ff000 00:00 0
b2600000-b2e00000 rw-p b2600000 00:00 0
b2e00000-b2f00000 rw-p b2e00000 00:00 0
b2fff000-b3000000 ---p b2fff000 00:00 0
b3000000-b3800000 rw-p b3000000 00:00 0
b3800000-b3900000 rw-p b3800000 00:00 0
b39ff000-b3a00000 ---p b39ff000 00:00 0
b3a00000-b4200000 rw-p b3a00000 00:00 0
b4200000-b4300000 rw-p b4200000 00:00 0
b43fe000-b43ff000 ---p b43fe000 00:00 0
b43ff000-b4bff000 rw-p b43ff000 00:00 0
b4bff000-b4c00000 ---p b4bff000 00:00 0
b4c00000-b5400000 rw-p b4c00000 00:00 0
b5400000-b5500000 rw-p b5400000 00:00 0
b55ff000-b5600000 ---p b55ff000 00:00 0
b5600000-b5e00000 rw-p b5600000 00:00 0
b5e00000-b5f00000 rw-p b5e00000 00:00 0
b5fff000-b6000000 ---p b5fff000 00:00 0
b6000000-b6800000 rw-p b6000000 00:00 0
b6800000-b6900000 rw-p b6800000 00:00 0
b69ff000-b6a00000 ---p b69ff000 00:00 0
b6a00000-b7200000 rw-p b6a00000 00:00 0
b7200000-b7300000 rw-p b7200000 00:00 0
b7387000-b7394000 r-xp 00000000 08:02 893 /lib/libgcc_s.so.1
b7394000-b7395000 r--p 0000c000 08:02 893 /lib/libgcc_s.so.1
b7395000-b7396000 rw-p 0000d000 08:02 893 /lib/libgcc_s.so.1
b73a6000-b73a7000 ---p b73a6000 00:00 0
b73a7000-b7ba7000 rw-p b73a7000 00:00 0
b7ba7000-b7bec000 r-xp 00000000 08:02 15537 /usr/lib/libgmp.so.3.4.4
b7bec000-b7bed000 r--p 00044000 08:02 15537 /usr/lib/libgmp.so.3.4.4
b7bed000-b7bee000 rw-p 00045000 08:02 15537 /usr/lib/libgmp.so.3.4.4
b7bf2000-b7bfc000 r-xp 00000000 08:02 9172
/usr/lib/perl/5.10.0/auto/threads/threads.so
b7bfc000-b7bfd000 r--p 00009000 08:02 9172
/usr/lib/perl/5.10.0/auto/threads/threads.so
b7bfd000-b7bfe000 rw-p 0000a000 08:02 9172
/usr/lib/perl/5.10.0/auto/threads/threads.so
b7bfe000-b7c0b000 r-xp 00000000 08:02 176168
/usr/lib/perl5/auto/Math/BigInt/GMP/GMP.so
b7c0b000-b7c0d000 rw-p 0000c000 08:02 176168
/usr/lib/perl5/auto/Math/BigInt/GMP/GMP.so
b7c0d000-b7c4c000 r--p 00000000 08:02 5607
/usr/lib/locale/en_US.utf8/LC_CTYPE
b7c4c000-b7c4d000 r--p 00000000 08:02 11414
/usr/lib/locale/en_US.utf8/LC_NUMERIC
b7c4d000-b7d38000 r--p 00000000 08:02 11416
/usr/lib/locale/en_US.utf8/LC_COLLATE
b7d38000-b7d39000 rw-p b7d38000 00:00 0
b7d39000-b7d42000 r-xp 00000000 08:02 7444
/lib/tls/i686/cmov/libcrypt-2.9.so
b7d42000-b7d43000 r--p 00008000 08:02 7444
/lib/tls/i686/cmov/libcrypt-2.9.so
b7d43000-b7d44000 rw-p 00009000 08:02 7444
/lib/tls/i686/cmov/libcrypt-2.9.so
b7d44000-b7d6b000 rw-p b7d44000 00:00 0
b7d6b000-b7ec7000 r-xp 00000000 08:02 7442
/lib/tls/i686/cmov/libc-2.9.so
b7ec7000-b7ec8000 ---p 0015c000 08:02 7442
/lib/tls/i686/cmov/libc-2.9.so
b7ec8000-b7eca000 r--p 0015c000 08:02 7442
/lib/tls/i686/cmov/libc-2.9.so
b7eca000-b7ecb000 rw-p 0015e000 08:02 7442
/lib/tls/i686/cmov/libc-2.9.so
b7ecb000-b7ece000 rw-p b7ecb000 00:00 0
b7ece000-b7ee3000 r-xp 00000000 08:02 7456
/lib/tls/i686/cmov/libpthread-2.9.so
b7ee3000-b7ee4000 r--p 00014000 08:02 7456
/lib/tls/i686/cmov/libpthread-2.9.so
b7ee4000-b7ee5000 rw-p 00015000 08:02 7456
/lib/tls/i686/cmov/libpthread-2.9.so
b7ee5000-b7ee8000 rw-p b7ee5000 00:00 0
b7ee8000-b7f0c000 r-xp 00000000 08:02 7446
/lib/tls/i686/cmov/libm-2.9.so
b7f0c000-b7f0d000 r--p 00023000 08:02 7446
/lib/tls/i686/cmov/libm-2.9.so
b7f0d000-b7f0e000 rw-p 00024000 08:02 7446
/lib/tls/i686/cmov/libm-2.9.so
b7f0e000-b7f10000 r-xp 00000000 08:02 7445
/lib/tls/i686/cmov/libdl-2.9.so
b7f10000-b7f11000 r--p 00001000 08:02 7445
/lib/tls/i686/cmov/libdl-2.9.so
b7f11000-b7f12000 rw-p 00002000 08:02 7445
/lib/tls/i686/cmov/libdl-2.9.so
b7f12000-b7f13000 r--p 00000000 08:02 11415
/usr/lib/locale/en_US.utf8/LC_TIME
b7f13000-b7f14000 r--p 00000000 08:02 11417
/usr/lib/locale/en_US.utf8/LC_MONETARY
b7f14000-b7f15000 r--p 00000000 08:02 11419
/usr/lib/locale/en_US.utf8/LC_MESSAGES/SYS_LC_MESSAGES
b7f15000-b7f16000 r--p 00000000 08:02 11420
/usr/lib/locale/en_US.utf8/LC_PAPER
b7f16000-b7f17000 r--p 00000000 08:02 11421
/usr/lib/locale/en_US.utf8/LC_NAME
b7f17000-b7f18000 r--p 00000000 08:02 11422
/usr/lib/locale/en_US.utf8/LC_ADDRESS
b7f18000-b7f19000 r--p 00000000 08:02 11423
/usr/lib/locale/en_US.utf8/LC_TELEPHONE
b7f19000-b7f1a000 r--p 00000000 08:02 11424
/usr/lib/locale/en_US.utf8/LC_MEASUREMENT
b7f1a000-b7f21000 r--s 00000000 08:02 882
/usr/lib/gconv/gconv-modules.cache
b7f21000-b7f22000 r--p 00000000 08:02 11425
/usr/lib/locale/en_US.utf8/LC_IDENTIFICATION
b7f22000-b7f24000 rw-p b7f22000 00:00 0
b7f24000-b7f25000 r-xp b7f24000 00:00 0 [vdso]
b7f25000-b7f41000 r-xp 00000000 08:02 1229 /lib/ld-2.9.so
b7f41000-b7f42000 r--p 0001b000 08:02 1229 /lib/ld-2.9.so
b7f42000-b7f43000 rw-p 0001c000 08:02 1229 /lib/ld-2.9.so
bf92e000-bf943000 rw-p bffeb000 00:00 0 [stack]
Aborted