------- Additional Comments From loose at astron dot nl 2010-03-03 11:26
-------
Hi Nick,
Segfaults remain, though they occur at different places now. Again, they have to
do with not checking the return value of bfd_zalloc. This still happens in a LOT
of places. Is this a deliberate choice of speed over robustness? Or is it just
sloppiness? Here's a sample backtrace of the first few stack frames (using
binutils-2.20.51.20100301, the CVS HEAD of March 1st):
#0 0x00007ffff7b09880 in scan_unit_for_symbols (unit=0x668270)
at ./dwarf2.c:1976
amt = 56
bytes_read = 1
i = 8
abbrev = 0x6677b0
func = 0x0
var = 0x0
low_pc = 0
abbrev_number = 30
attr = {
name = DW_AT_const_value,
form = DW_FORM_data2,
u = {
str = 0x100 <Address 0x100 out of bounds>,
blk = 0x100,
val = 256,
sval = 256
}
}
high_pc = 0
abfd = 0x60e9c0
info_ptr = 0x63d57b "N\n"
nesting_level = 3
nested_funcs = 0x671030
nested_funcs_size = 32
__PRETTY_FUNCTION__ = "scan_unit_for_symbols"
#1 0x00007ffff7b0a4de in comp_unit_find_nearest_line (unit=0x668270,
addr=4225314, filename_ptr=0x7fffffffd338,
functionname_ptr=0x7fffffffd340, linenumber_ptr=0x7fffffffd348,
stash=0x6204b0) at ./dwarf2.c:2359
line_p = 6718064
func_p = 0
function = 0x407922
#2 0x00007ffff7b0bec8 in find_line (abfd=0x60e9c0, section=0x61cce0,
offset=6914, symbol=0x0, symbols=0x60fb00, filename_ptr=0x7fffffffd338,
functionname_ptr=0x7fffffffd340, linenumber_ptr=0x7fffffffd348,
addr_size=4, pinfo=0x60ef10) at ./dwarf2.c:3288
length = 20818
offset_size = 4
info_ptr_unit = 0x63cf55 "RQ"
stash = 0x6204b0
addr = 4225314
each = 0x668270
found = 0
do_line = 0
__PRETTY_FUNCTION__ = "find_line"
#3 0x00007ffff7b0c019 in _bfd_dwarf2_find_nearest_line (abfd=0x60e9c0,
section=0x61cce0, symbols=0x60fb00, offset=6914,
filename_ptr=0x7fffffffd338, functionname_ptr=0x7fffffffd340,
linenumber_ptr=0x7fffffffd348, addr_size=0, pinfo=0x60ef10)
at ./dwarf2.c:3323
No locals.
#4 0x00007ffff7b2c719 in _bfd_elf_find_nearest_line (abfd=0x60e9c0,
section=0x61cce0, symbols=0x60fb00, offset=6914,
filename_ptr=0x7fffffffd338, functionname_ptr=0x7fffffffd340,
line_ptr=0x7fffffffd348) at elf.c:7254
found = 0
--
http://sourceware.org/bugzilla/show_bug.cgi?id=11302
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