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Subject: Re: [devel] =?utf-8?b?0L/RgNC+0LHQu9C10LzQsCDRgSBib29zdDo6c3Bpcml0?=
 =?utf-8?b?INC90LAgaTU4NiDQuCBhcm1o?=
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On 12/16/20 5:28 PM, Ivan A. Melnikov wrote:
> On Sun, Dec 13, 2020 at 03:35:57AM +0300, Vladislav Zavjalov wrote:
>> Обнаружил странную регрессию в одной из своих программ:
>> на 32-битных архитектурах начались падения (Segmentation fault)
>> где-то в районе boost::spirit (очень смешная библиотека для
>> синтаксического разбора, когда-то давно она меня радовала).
>> Судя по всему, произошло это одновременно с переходом на gcc-10,
>> до этого пакет нормально пересобирался.
>>
>> Сделал тестовый пакет с каким-то минимальным кодом, пытался отлаживать
>> на сборочнице, но точное место поймать пока не смог. Как только правила
>> spirit становятся достаточно длинными - начинает падать.
>> Зато выяснил, что падения лечатся убиранием флага -O2.
>> Может быть, кому-нибудь такой рецепт поможет.
>>
>> Если кто-то захочет покопаться, то код есть тут:
>> http://git.altlinux.org/tasks/263387/gears/2200/git
>> А типичный лог на сборочнице выглядит так:
>> http://git.altlinux.org/tasks/263387/build/2200/i586/log
>> Собираю и запускаю программу дважды: без флага -O2 и с ним.
>> Первый раз все работает, второй - падает.
>> На armh - то же самое.
> 
> 
> Я просто оставлю здесь то, что успел (пока) увидеть:
> 
> [builder@localhost fig]$ g++ -O2 main.cpp fig_mask.cpp   -o main && ./main
> Segmentation fault (core dumped)
> [builder@localhost fig]$ g++ -O2 -fno-tree-sra  main.cpp fig_mask.cpp   -o main && ./main
> OK
> [builder@localhost fig]$ g++-9 -O2 main.cpp fig_mask.cpp   -o main && ./main
> OK
> 
Подтверждаю падение i386 бинарника, собранного g++-10 (неважно - кросс-компилятором, или "родным").
Достаточно даже не -O2, а просто -O.

Программу удалось несколько ужать до

#include <boost/spirit/include/classic_core.hpp>
#include <boost/spirit/include/classic_assign_actor.hpp>
using namespace boost::spirit::classic;

int main() {
         const char str[] = " 1 2 3 4 5 6 7 8";
         int f[8] = { 0, -1, -2, -3, -4, -5, -6, -7 };
         rule<> myrule =
                    +blank_p >> (ch_p('*') | int_p[assign_a(f[0])])
                 >> +blank_p >> (ch_p('*') | int_p[assign_a(f[1])])
                 >> +blank_p >> (ch_p('*') | int_p[assign_a(f[2])])
                 >> +blank_p >> (ch_p('*') | int_p[assign_a(f[3])])
                 >> +blank_p >> (ch_p('*') | int_p[assign_a(f[4])])
                 >> +blank_p >> (ch_p('*') | int_p[assign_a(f[5])])
                 >> +blank_p >> (ch_p('*') | int_p[assign_a(f[6])])
                 >> +blank_p >> (ch_p('*') | int_p[assign_a(f[7])])
                 ;
         if (!parse(str, myrule).full){
                 return 1;
         }
         return 0;
}

Если кому интересно - backtrace в приложении.

(gdb) frame 20
(gdb) print p.subj.first_.subj.first_.subj.first_.subj.first_.subj.first_.subj.first_.subj.first_.subj.first_.subj.first_.subj.first_.subj.first_.subj.first_.subj.first_.subj.first_.subj.seco
nd_.subj.second_.actor
{<boost::spirit::classic::assign_action> = {<No data fields>}, ref = @0x0}



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#0  ref_value_actor<int, assign_action>::operator()<int> (val_=3D@0xffffc=
e08: 1, this=3D0x5655ebc0) at /usr/include/boost/spirit/home/classic/acto=
r/ref_value_actor.hpp:60
#1  attributed_action_policy<int const>::call<ref_value_actor<int, assign=
_action>, char const*> (val=3D@0xffffce08: 1, actor=3D...) at /usr/includ=
e/boost/spirit/home/classic/core/scanner/scanner.hpp:131
#2  action_policy::do_action<ref_value_actor<int, assign_action>, int con=
st, char const*> (last=3D@0xffffcefc: 0xffffcf2d " 2 3 4 5 6 7 8", first=3D=
<synthetic pointer>: <optimized out>, val=3D@0xffffce08: 1, actor=3D..., =
this=3D0xffffcf00) at /usr/include/boost/spirit/home/classic/core/scanner=
/scanner.hpp:162
#3  action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_actio=
n>>::parse<scanner<char const*, scanner_policies<iteration_policy, match_=
policy, action_policy>>> (this=3D0x5655ebbc, scan=3D...) at /usr/include/=
boost/spirit/home/classic/core/composite/actions.hpp:117
#4  0x565566c4 in alternative<chlit<char>, action<int_parser<int, 10, 1u,=
 -1>, ref_value_actor<int, assign_action>>>::parse<scanner<char const*, s=
canner_policies<iteration_policy, match_policy, action_policy>>> (scan=3D=
=2E.., this=3D0x5655ebb8) at /usr/include/boost/detail/compressed_pair.hp=
p:385
#5  sequence<positive<blank_parser>, alternative<chlit<char>, action<int_=
parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>::parse<sc=
anner<char const*, scanner_policies<iteration_policy, match_policy, actio=
n_policy>>> (scan=3D..., this=3D0x5655ebb4) at /usr/include/boost/spirit/=
home/classic/core/composite/sequence.hpp:61
#6  sequence<sequence<positive<blank_parser>, alternative<chlit<char>, ac=
tion<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>,=
 positive<blank_parser>>::parse<scanner<char const*, scanner_policies<ite=
ration_policy, match_policy, action_policy>>> (scan=3D..., this=3D0x5655e=
bb4) at /usr/include/boost/spirit/home/classic/core/composite/sequence.hp=
p:60
#7  sequence<sequence<sequence<positive<blank_parser>, alternative<chlit<=
char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_ac=
tion>>>>, positive<blank_parser>>, alternative<chlit<char>, action<int_pa=
rser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>::parse<scan=
ner<char const*, scanner_policies<iteration_policy, match_policy, action_=
policy>>> (scan=3D..., this=3D0x5655ebb4) at /usr/include/boost/spirit/ho=
me/classic/core/composite/sequence.hpp:60
#8  sequence<sequence<sequence<sequence<positive<blank_parser>, alternati=
ve<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, =
assign_action>>>>, positive<blank_parser>>, alternative<chlit<char>, acti=
on<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, p=
ositive<blank_parser>>::parse<scanner<char const*, scanner_policies<itera=
tion_policy, match_policy, action_policy>>> (scan=3D..., this=3D0x5655ebb=
4) at /usr/include/boost/spirit/home/classic/core/composite/sequence.hpp:=
60
#9  sequence<sequence<sequence<sequence<sequence<positive<blank_parser>, =
alternative<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_ac=
tor<int, assign_action>>>>, positive<blank_parser>>, alternative<chlit<ch=
ar>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_acti=
on>>>>, positive<blank_parser>>, alternative<chlit<char>, action<int_pars=
er<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>::parse<scanne=
r<char const*, scanner_policies<iteration_policy, match_policy, action_po=
licy>>> (scan=3D..., this=3D0x5655ebb4) at /usr/include/boost/spirit/home=
/classic/core/composite/sequence.hpp:60
#10 sequence<sequence<sequence<sequence<sequence<sequence<positive<blank_=
parser>, alternative<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref=
_value_actor<int, assign_action>>>>, positive<blank_parser>>, alternative=
<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, as=
sign_action>>>>, positive<blank_parser>>, alternative<chlit<char>, action=
<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, pos=
itive<blank_parser>>::parse<scanner<char const*, scanner_policies<iterati=
on_policy, match_policy, action_policy>>> (scan=3D..., this=3D0x5655ebb4)=
 at /usr/include/boost/spirit/home/classic/core/composite/sequence.hpp:60=

#11 sequence<sequence<sequence<sequence<sequence<sequence<sequence<positi=
ve<blank_parser>, alternative<chlit<char>, action<int_parser<int, 10, 1u,=
 -1>, ref_value_actor<int, assign_action>>>>, positive<blank_parser>>, al=
ternative<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_acto=
r<int, assign_action>>>>, positive<blank_parser>>, alternative<chlit<char=
>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action=
>>>>, positive<blank_parser>>, alternative<chlit<char>, action<int_parser=
<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>::parse<scanner<=
char const*, scanner_policies<iteration_policy, match_policy, action_poli=
cy>>> (scan=3D..., this=3D0x5655ebb4) at /usr/include/boost/spirit/home/c=
lassic/core/composite/sequence.hpp:60
#12 sequence<sequence<sequence<sequence<sequence<sequence<sequence<sequen=
ce<positive<blank_parser>, alternative<chlit<char>, action<int_parser<int=
, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, positive<blank_par=
ser>>, alternative<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_v=
alue_actor<int, assign_action>>>>, positive<blank_parser>>, alternative<c=
hlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assi=
gn_action>>>>, positive<blank_parser>>, alternative<chlit<char>, action<i=
nt_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, posit=
ive<blank_parser>>::parse<scanner<char const*, scanner_policies<iteration=
_policy, match_policy, action_policy>>> (this=3D0x5655ebb4, scan=3D...) a=
t /usr/include/boost/spirit/home/classic/core/composite/sequence.hpp:60
#13 0x565569c0 in sequence<sequence<sequence<sequence<sequence<sequence<s=
equence<sequence<sequence<positive<blank_parser>, alternative<chlit<char>=
, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>=
>>>, positive<blank_parser>>, alternative<chlit<char>, action<int_parser<=
int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, positive<blank_=
parser>>, alternative<chlit<char>, action<int_parser<int, 10, 1u, -1>, re=
f_value_actor<int, assign_action>>>>, positive<blank_parser>>, alternativ=
e<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, a=
ssign_action>>>>, positive<blank_parser>>, alternative<chlit<char>, actio=
n<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>::pa=
rse<scanner<char const*, scanner_policies<iteration_policy, match_policy,=
 action_policy>>> (scan=3D..., this=3D0x5655ebb4) at /usr/include/boost/d=
etail/compressed_pair.hpp:382
#14 sequence<sequence<sequence<sequence<sequence<sequence<sequence<sequen=
ce<sequence<sequence<positive<blank_parser>, alternative<chlit<char>, act=
ion<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, =
positive<blank_parser>>, alternative<chlit<char>, action<int_parser<int, =
10, 1u, -1>, ref_value_actor<int, assign_action>>>>, positive<blank_parse=
r>>, alternative<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_val=
ue_actor<int, assign_action>>>>, positive<blank_parser>>, alternative<chl=
it<char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign=
_action>>>>, positive<blank_parser>>, alternative<chlit<char>, action<int=
_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, positiv=
e<blank_parser>>::parse<scanner<char const*, scanner_policies<iteration_p=
olicy, match_policy, action_policy>>> (scan=3D..., this=3D0x5655ebb4) at =
/usr/include/boost/spirit/home/classic/core/composite/sequence.hpp:60
#15 sequence<sequence<sequence<sequence<sequence<sequence<sequence<sequen=
ce<sequence<sequence<sequence<positive<blank_parser>, alternative<chlit<c=
har>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_act=
ion>>>>, positive<blank_parser>>, alternative<chlit<char>, action<int_par=
ser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, positive<bl=
ank_parser>>, alternative<chlit<char>, action<int_parser<int, 10, 1u, -1>=
, ref_value_actor<int, assign_action>>>>, positive<blank_parser>>, altern=
ative<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<in=
t, assign_action>>>>, positive<blank_parser>>, alternative<chlit<char>, a=
ction<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>=
, positive<blank_parser>>, alternative<chlit<char>, action<int_parser<int=
, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>::parse<scanner<char=
 const*, scanner_policies<iteration_policy, match_policy, action_policy>>=
> (scan=3D..., this=3D0x5655ebb4) at /usr/include/boost/spirit/home/class=
ic/core/composite/sequence.hpp:60
#16 sequence<sequence<sequence<sequence<sequence<sequence<sequence<sequen=
ce<sequence<sequence<sequence<sequence<positive<blank_parser>, alternativ=
e<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, a=
ssign_action>>>>, positive<blank_parser>>, alternative<chlit<char>, actio=
n<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, po=
sitive<blank_parser>>, alternative<chlit<char>, action<int_parser<int, 10=
, 1u, -1>, ref_value_actor<int, assign_action>>>>, positive<blank_parser>=
>, alternative<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value=
_actor<int, assign_action>>>>, positive<blank_parser>>, alternative<chlit=
<char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_a=
ction>>>>, positive<blank_parser>>, alternative<chlit<char>, action<int_p=
arser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, positive<=
blank_parser>>::parse<scanner<char const*, scanner_policies<iteration_pol=
icy, match_policy, action_policy>>> (this=3D0x5655ebb4, scan=3D...) at /u=
sr/include/boost/spirit/home/classic/core/composite/sequence.hpp:60
#17 0x56556b7f in sequence<sequence<sequence<sequence<sequence<sequence<s=
equence<sequence<sequence<sequence<sequence<sequence<sequence<positive<bl=
ank_parser>, alternative<chlit<char>, action<int_parser<int, 10, 1u, -1>,=
 ref_value_actor<int, assign_action>>>>, positive<blank_parser>>, alterna=
tive<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int=
, assign_action>>>>, positive<blank_parser>>, alternative<chlit<char>, ac=
tion<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>,=
 positive<blank_parser>>, alternative<chlit<char>, action<int_parser<int,=
 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, positive<blank_pars=
er>>, alternative<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_va=
lue_actor<int, assign_action>>>>, positive<blank_parser>>, alternative<ch=
lit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assig=
n_action>>>>, positive<blank_parser>>, alternative<chlit<char>, action<in=
t_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>::parse<=
scanner<char const*, scanner_policies<iteration_policy, match_policy, act=
ion_policy>>> (scan=3D..., this=3D0x5655ebb4) at /usr/include/boost/detai=
l/compressed_pair.hpp:382
#18 sequence<sequence<sequence<sequence<sequence<sequence<sequence<sequen=
ce<sequence<sequence<sequence<sequence<sequence<sequence<positive<blank_p=
arser>, alternative
<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, as=
sign_action>>>>, positive<blank_parser>>, alternative<chlit<char>, action=
<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, pos=
itive<blank_parser>>, alternative<chlit<char>, action<int_parser<int, 10,=
 1u, -1>, ref_value_actor<int, assign_action>>>>, positive<blank_parser>>=
, alternative<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_=
actor<int, assign_action>>>>, positive<blank_parser>>, alternative<chlit<=
char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_ac=
tion>>>>, positive<blank_parser>>, alternative<chlit<char>, action<int_pa=
rser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, positive<b=
lank_parser>>, alternative<chlit<char>, action<int_parser<int, 10, 1u, -1=
>, ref_value_actor<int, assign_action>>>>, positive<blank_parser>>::parse=
<scanner<char const*, scanner_policies<iteration_policy, match_policy, ac=
tion_policy>>> (scan=3D..., this=3D0x5655ebb4) at /usr/include/boost/spir=
it/home/classic/core/composite/sequence.hpp:60
#19 sequence<sequence<sequence<sequence<sequence<sequence<sequence<sequen=
ce<sequence<sequence<sequence<sequence<sequence<sequence<sequence<positiv=
e<blank_parser>, alternative<chlit<char>, action<int_parser<int, 10, 1u, =
-1>, ref_value_actor<int, assign_action>>>>, positive<blank_parser>>, alt=
ernative<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor=
<int, assign_action>>>>, positive<blank_parser>>, alternative<chlit<char>=
, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>=
>>>, positive<blank_parser>>, alternative<chlit<char>, action<int_parser<=
int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, positive<blank_=
parser>>, alternative<chlit<char>, action<int_parser<int, 10, 1u, -1>, re=
f_value_actor<int, assign_action>>>>, positive<blank_parser>>, alternativ=
e<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, a=
ssign_action>>>>, positive<blank_parser>>, alternative<chlit<char>, actio=
n<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, po=
sitive<blank_parser>>, alternative<chlit<char>, action<int_parser<int, 10=
, 1u, -1>, ref_value_actor<int, assign_action>>>>::parse<scanner<char con=
st*, scanner_policies<iteration_policy, match_policy, action_policy>>> (s=
can=3D..., this=3D0x5655ebb4) at /usr/include/boost/spirit/home/classic/c=
ore/composite/sequence.hpp:60
#20 impl::concrete_parser<sequence<sequence<sequence<sequence<sequence<se=
quence<sequence<sequence<sequence<sequence<sequence<sequence<sequence<seq=
uence<sequence<positive<blank_parser>, alternative<chlit<char>, action<in=
t_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, positi=
ve<blank_parser>>, alternative<chlit<char>, action<int_parser<int, 10, 1u=
, -1>, ref_value_actor<int, assign_action>>>>, positive<blank_parser>>, a=
lternative<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_act=
or<int, assign_action>>>>, positive<blank_parser>>, alternative<chlit<cha=
r>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_actio=
n>>>>, positive<blank_parser>>, alternative<chlit<char>, action<int_parse=
r<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, positive<blan=
k_parser>>, alternative<chlit<char>, action<int_parser<int, 10, 1u, -1>, =
ref_value_actor<int, assign_action>>>>, positive<blank_parser>>, alternat=
ive<chlit<char>, action<int_parser<int, 10, 1u, -1>, ref_value_actor<int,=
 assign_action>>>>, positive<blank_parser>>, alternative<chlit<char>, act=
ion<int_parser<int, 10, 1u, -1>, ref_value_actor<int, assign_action>>>>, =
scanner<char const*, scanner_policies<iteration_policy, match_policy, act=
ion_policy>>, nil_t>::do_parse_virtual (this=3D0x5655ebb0, scan=3D...) at=
 /usr/include/boost/spirit/home/classic/core/non_terminal/impl/rule.ipp:2=
41
#21 0x56556367 in impl::rule_base<rule<nil_t, nil_t, nil_t>, rule<nil_t, =
nil_t, nil_t> const&, nil_t, nil_t, nil_t>::parse_main<scanner<char const=
*, scanner_policies<iteration_policy, match_policy, action_policy>>> (sca=
n=3D..., this=3D0xffffcef8) at /usr/include/boost/spirit/home/classic/cor=
e/impl/match.ipp:66
#22 impl::rule_base<rule<nil_t, nil_t, nil_t>, rule<nil_t, nil_t, nil_t> =
const&, nil_t, nil_t, nil_t>::parse<scanner<char const*, scanner_policies=
<iteration_policy, match_policy, action_policy>>> (scan=3D..., this=3D0xf=
fffcef8) at /usr/include/boost/spirit/home/classic/core/non_terminal/impl=
/rule.ipp:174
#23 parse<char const*, rule<nil_t, nil_t, nil_t>> (p=3D..., last=3D<synth=
etic pointer>: <optimized out>, first_=3D<synthetic pointer>: <optimized =
out>) at /usr/include/boost/spirit/home/classic/core/impl/parser.ipp:30
#24 parse<char, rule<nil_t, nil_t, nil_t>> (p=3D..., str=3D0xffffcf2b " 1=
 2 3 4 5 6 7 8") at /usr/include/boost/spirit/home/classic/core/impl/pars=
er.ipp:47
#25 main () at main.cpp:18

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