Hi, is the bug #355721 a compiler bug? I've inspected the program with valgrind, but couldn't find any clue of a bug in the code.
I've took a look on it with gdb and this is the code after the return:
here the return value 0 gets loaded:
<crm_expr_markov_classify+10748>: li r9,0
<crm_expr_markov_classify+10752>: addis r7,r31,5
<crm_expr_markov_classify+10756>: stw r9,-10184(r7)
<crm_expr_markov_classify+10760>: addis r7,r31,5
<crm_expr_markov_classify+10764>: lwz r0,-10184(r7)
<crm_expr_markov_classify+10768>: mr r3,r0
<crm_expr_markov_classify+10772>: lwz r11,0(r1)
<crm_expr_markov_classify+10776>: lwz r0,4(r11)
here the return address register gets overwritten:
<crm_expr_markov_classify+10780>: mtlr r0
<crm_expr_markov_classify+10784>: lwz r27,-36(r11)
<crm_expr_markov_classify+10788>: lwz r28,-32(r11)
<crm_expr_markov_classify+10792>: lwz r29,-28(r11)
<crm_expr_markov_classify+10796>: lwz r31,-20(r11)
<crm_expr_markov_classify+10800>: lfd f30,-16(r11)
<crm_expr_markov_classify+10804>: lfd f31,-8(r11)
<crm_expr_markov_classify+10808>: mr r1,r11
and here the SIGSEG raises:
<crm_expr_markov_classify+10812>: blr
The sigseg raises at the end of a really big function (~1500 line of code)
which alloces heavily locale variables. Is it possible gcc overwrites
neccessary data within the function while calling a subfunction?
The sigseg does not occur (with the message used in the bug report, but
with another mail) when I remove the last parameter of the sprintf call
in crm_markovian.c:2078
sprintf (buf,
"#%ld (%s):"\
" features: %ld, hits: %ld, prob: %3.2e,\n",
k,
hashname[k],
fcounts[k],
totalhits[k],
ptc[k]
);
I find this really, really confusing. What can I do to catch this bug?
Kind regards, Jörg.
--
Wer eher stirbt ist länger tot.
(Un B. Kant)
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