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bug#20614: Segmentation fault when building on Power8 Little Endian
From: |
Petr Hracek |
Subject: |
bug#20614: Segmentation fault when building on Power8 Little Endian |
Date: |
Mon, 5 Oct 2015 09:40:15 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 |
On 10/02/2015 03:46 PM, Eli Zaretskii wrote:
Cc: 20614@debbugs.gnu.org
From: Petr Hracek <phracek@redhat.com>
Date: Fri, 2 Oct 2015 14:58:56 +0200
On 10/02/2015 10:49 AM, Eli Zaretskii wrote:
Cc: 20614@debbugs.gnu.org
From: Petr Hracek <phracek@redhat.com>
Date: Fri, 2 Oct 2015 10:36:27 +0200
What does this GDB command display in frame #1:
(gdb) p old_section_names + NEW_SECTION_H (nn).sh_name
?
It is a really strange.
in our unexelf.c is NEW_SECTION_H defined as
#define NEW_SECTION_H(n) \
(*(ElfW (Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
Paul Eggert did a some patch 1 or 2 year ago and modify it to
#define NEW_SECTION_H(n) \
(*(ElfW (Shdr) *) entry_address (new_section_h, n, new_file_h->e_shentsize))
(gdb) frame 1
#1 0x00000000102e3724 in unexec (new_name=0x116387e8
"/home/phracek/rpmbuild/BUILD/emacs-24.3/src/emacs", old_name=0x11638838
"/home/phracek/rpmbuild/BUILD/emacs-24.3/src/temacs")
at unexelf.c:1258
1258 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data")
(gdb) p old_section_names
$1 = 0x3fffab1dbfcc ""
(gdb) p old_section_names + NEW_SECTION_H (nn).sh_name
No symbol "NEW_SECTION_H" in current context.
Use the expansion of that macro instead to display the value.
How to use the expansion.
Just type it by hand:
(gdb) p old_section_names + (*(ElfW (Shdr) *) ((byte *) new_section_h +
new_file_h->e_shentsize * (nn)))
Are you connected on freenode #emacs.
No.
First of all thank you for your time.
Well,
(gdb) p (*(ElfW (Shdr) *) ((byte *) new_section_h +
new_file_h->e_shentsize * (nn)))
No symbol "ElfW" in current context.
(gdb)
Also ElfBitsW does not exists.
(gdb) p ElfBitsW
No symbol "ElfBitsW" in current context.
(gdb)
I tried to find out what could be used from elf.h header file
but no any idea.
I guess that ELFSIZE should be defined from unexec.h, right?
http://git.savannah.gnu.org/cgit/emacs.git/tree/src/unexelf.c?h=emacs-24#n513
(gdb) p ELFSIZE
No symbol "ELFSIZE" in current context.
(gdb)
(gdb) frame 1
#1 0x00000000102e4174 in unexec (new_name=0x115c2868
"/home/phracek/rpmbuild/BUILD/emacs-24.3/src/emacs", old_name=0x115c28b8
"/home/phracek/rpmbuild/BUILD/emacs-24.3/src/temacs")
at unexelf.c:1257
1257 if (!strcmp (old_section_names + NEW_SECTION_H
(nn).sh_name, ".data")
(gdb) i locals
section = {sh_name = 122, sh_type = 4, sh_flags = 2, sh_addr =
268483520, sh_offset = 48064, sh_size = 768, sh_link = 5, sh_info = 0,
sh_addralign = 8, sh_entsize = 24}
new_file = 10
old_file = 9
new_file_size = 30325149
new_break = 0x11690000
old_base = 0x3fffaa7a0000 "\177ELF\002\001\001"
new_base = 0x3fffa8ab0000 "\177ELF\002\001\001"
old_file_h = 0x3fffaa7a0000
new_file_h = 0x3fffa8ab0000
old_program_h = 0x3fffaa7a0040
new_program_h = 0x3fffa8ab0040
old_section_h = 0x3fffab17a798
new_section_h = 0x3fffaa72a798
old_section_names = 0x3fffab17a657 ""
old_bss_addr = 272564224
new_bss_addr = 292093952
old_bss_size = 563096
new_data2_size = 19529728
new_data2_offset = 4063232
new_data2_addr = 272564224
old_bss_offset = 4063232
new_data2_incr = 19529728
n = 9
nn = 0
old_bss_index = 22
old_sbss_index = -1
old_plt_index = 20
old_data_index = 21
new_data2_index = 20
stat_buf = {st_dev = 2050, st_ino = 5119868, st_nlink = 1, st_mode =
33261, st_uid = 20582, st_gid = 20582, __pad2 = 0, st_rdev = 0, st_size
= 10795357, st_blksize = 4096,
st_blocks = 20976, st_atim = {tv_sec = 1444028953, tv_nsec =
509013261}, st_mtim = {tv_sec = 1444028953, tv_nsec = 379013248},
st_ctim = {tv_sec = 1444028953, tv_nsec = 379013248},
__unused4 = 0, __unused5 = 0, __unused6 = 0}
old_file_size = 10795357
(gdb)
It seems like some compilation directives are missing. But of course I
am guessing.
Local exec file:
`/home/phracek/rpmbuild/BUILD/emacs-24.3/src/temacs', file type
elf64-powerpcle.
Entry point: 0x10016100
0x0000000010000238 - 0x0000000010000249 is .interp
0x000000001000024c - 0x000000001000026c is .note.ABI-tag
0x000000001000026c - 0x0000000010000290 is .note.gnu.build-id
0x0000000010000290 - 0x000000001000036c is .gnu.hash
0x0000000010000370 - 0x0000000010006790 is .dynsym
0x0000000010006790 - 0x000000001000b204 is .dynstr
0x000000001000b204 - 0x000000001000ba5c is .gnu.version
0x000000001000ba60 - 0x000000001000bbc0 is .gnu.version_r
0x000000001000bbc0 - 0x000000001000bec0 is .rela.toc
0x000000001000bec0 - 0x0000000010011ff8 is .rela.plt
0x0000000010012000 - 0x000000001001204c is .init
0x0000000010012060 - 0x000000001037d398 is .text
0x000000001037d398 - 0x000000001037d3bc is .fini
0x000000001037d3c0 - 0x00000000103a08e2 is .rodata
0x00000000103a08e4 - 0x00000000103a9178 is .eh_frame_hdr
0x00000000103a9178 - 0x00000000103d0258 is .eh_frame
0x00000000103ef100 - 0x00000000103ef530 is .data.rel.ro
0x00000000103ef530 - 0x00000000103ef970 is .dynamic
0x00000000103ef970 - 0x00000000103f0000 is .got
0x00000000103f0000 - 0x00000000103f2078 is .plt
0x00000000103f2078 - 0x00000000106b91b8 is .data
0x00000000106b91c0 - 0x00000000107408e0 is .bss
0x00003fffb7fb0200 - 0x00003fffb7fb0224 is .note.gnu.build-id in
/lib64/ld64.so.2
0x00003fffb7fb0228 - 0x00003fffb7fb02e4 is .hash in /lib64/ld64.so.2
--
Petr Hracek
Software Engineer
Developer Experience
Red Hat, Inc
Mob: +420777056169
email: phracek@redhat.com
- bug#20614: Segmentation fault when building on Power8 Little Endian, (continued)
- bug#20614: Segmentation fault when building on Power8 Little Endian, Petr Hracek, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Petr Hracek, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Petr Hracek, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Eli Zaretskii, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Petr Hracek, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Eli Zaretskii, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Petr Hracek, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Eli Zaretskii, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Petr Hracek, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Eli Zaretskii, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian,
Petr Hracek <=
- bug#20614: Segmentation fault when building on Power8 Little Endian, Eli Zaretskii, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Petr Hracek, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Eli Zaretskii, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Petr Hracek, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Eli Zaretskii, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Petr Hracek, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Eli Zaretskii, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Petr Hracek, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Petr Hracek, 2015/10/08
- bug#20614: Segmentation fault when building on Power8 Little Endian, Eli Zaretskii, 2015/10/08