My program is evidently writing into a forbidden area of memory, as it
segfaults in the Standard Library std::string code, attempting to access memory
below the stack pointer. Memcheck 3.11 isn't finding anything significant,
except that it prints these warning messages at the beginning of the run:
--27820-- warning: addVar: in range 0x0 .. 0x179 outside all rx mapped areas
(this)
--27820-- warning: addVar: in range 0x0 .. 0x179 outside all rx mapped areas
(__k)
--27820-- warning: addVar: in range 0x0 .. 0x167 outside all rx mapped areas
(__x)
--27820-- warning: addVar: in range 0x0 .. 0x167 outside all rx mapped areas
(__y)
--27820-- warning: addVar: in range 0x0 .. 0x167 outside all rx mapped areas
(__comp)
--27820-- warning: addVar: in range 0x0 .. 0x167 outside all rx mapped areas
(__j)
Do those give any clue as to the source of my error? Also, Memcheck prints
out few messages like the following right at the beginning, with no other
information. Any ideas on this?
--27820-- free(0x0)
My O/S is CentOS 6.6. Here are my Memcheck arguments:
valgrind --gen-suppressions=all --error-markers=BEGIN_MARK,END_MARK
--free-fill=FF --malloc-fill=FF --trace-malloc=yes --trace-children=yes
--track-origins=yes --read-var-info=yes --partial-loads-ok=no
--log-file=vg2.out --suppressions=./vg2_suppressions.supp <my_program>
Thanks for any help.
Kurt
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