On Wed, Jul 27, 2011 at 12:06 PM, Jerry James <loganjerry@xxxxxxxxx> wrote:
> It isn't strip. If I run strip on the version of libmtcp.so left in
> the build dir and copy it over /usr/lib64/dmtcp/libmtcp.so, then it
> also works. But that version is different from the one installed by
> rpm. Watch this:
>
> $ ldd -r /usr/lib64/dmtcp/libmtcp.so
> linux-vdso.so.1 => (0x00007fff7d7c3000)
> libdl.so.2 => /lib64/libdl.so.2 (0x00007f913f396000)
> libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f913f17b000)
> libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f913ef65000)
> libc.so.6 => /lib64/libc.so.6 (0x00007f913ebcc000)
> /lib64/ld-linux-x86-64.so.2 (0x0000003520600000)
> undefined symbol: mtcp_restore_start (/usr/lib64/dmtcp/libmtcp.so)
> undefined symbol: dmtcp_exists (/usr/lib64/dmtcp/libmtcp.so)
> undefined symbol: mtcp_restore_argv_start_addr (/usr/lib64/dmtcp/libmtcp.so)
> undefined symbol: mtcp_sys_errno (/usr/lib64/dmtcp/libmtcp.so)
> undefined symbol: mtcp_get_thread_sysinfo (/usr/lib64/dmtcp/libmtcp.so)
> undefined symbol: mtcp_no (/usr/lib64/dmtcp/libmtcp.so)
> undefined symbol: mtcp_dump_tls (/usr/lib64/dmtcp/libmtcp.so)
> undefined symbol: mtcp_readdec (/usr/lib64/dmtcp/libmtcp.so)
> undefined symbol: test_and_prepare_for_forked_ckpt (/usr/lib64/dmtcp/libmtcp.so)
> undefined symbol: write_ckpt_to_file (/usr/lib64/dmtcp/libmtcp.so)
> undefined symbol: mtcp_readchar (/usr/lib64/dmtcp/libmtcp.so)
> $ ldd -r /tmp/libmtcp-stripped.so
> linux-vdso.so.1 => (0x00007fffcd3ff000)
> libdl.so.2 => /lib64/libdl.so.2 (0x00007f02082b3000)
> libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f0208098000)
> libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f0207e82000)
> libc.so.6 => /lib64/libc.so.6 (0x00007f0207ae9000)
> /lib64/ld-linux-x86-64.so.2 (0x0000003520600000)
>
> The program /usr/lib/rpm/debugedit is used to extract debug
> information from ELF objects when building RPMs. It looks like it is
> damaging the shared object somehow.
Hmmmm, the dmtcp project is patching the default linker script:
make[1]: Entering directory
`/home/jamesjer/rpmbuild/BUILD/dmtcp-1.2.3+svn1214/mtcp'
rm -f mtcp.t
ld -shared --verbose > mtcp.t
sed -i -e '1,/========================/ d' mtcp.t
sed -i -e '/========================/,$ d' mtcp.t
rm -f mtcp.t-fail
if test x86_64 = x86_64; then \
if patch mtcp.t mtcp.t.patch-x86_64; then \
:; \
else \
mv mtcp.t mtcp.t-fail; false; \
fi \
else \
if patch mtcp.t mtcp.t.patch-i386; then \
:; \
else \
mv mtcp.t mtcp.t-fail; false; \
fi \
fi
patching file mtcp.t
Hunk #1 succeeded at 6 with fuzz 2.
Hunk #2 succeeded at 189 (offset 14 lines).
...
gcc -shared -fPIC -T mtcp.t -Wl,-Map,mtcp.map -o libmtcp.so \
mtcp.o mtcp_restart_nolibc.o mtcp_maybebpt.o mtcp_printf.o
mtcp_util.o mtcp_safemmap.o mtcp_safe_open.o mtcp_state.o
mtcp_check_vdso.o mtcp_sigaction.o mtcp_ptrace.o mtcp_fastckpt.o -ldl
-lpthread
Here's the diff against the default linker script:
--- linker.default 2011-07-27 12:09:30.492379093 -0600
+++ mtcp.t 2011-07-27 11:48:10.803379078 -0600
@@ -1,12 +1,3 @@
-GNU ld version 2.21.51.0.6-6.fc15 20110118
- Supported emulations:
- elf_x86_64
- elf32_x86_64
- elf_i386
- i386linux
- elf_l1om
-using internal linker script:
-==================================================
/* Script for --shared -z combreloc: shared library, combine & sort relocs */
OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64",
"elf64-x86-64")
@@ -15,6 +6,9 @@
SEARCH_DIR("/usr/x86_64-redhat-linux/lib64");
SEARCH_DIR("/usr/local/lib64"); SEARCH_DIR("/lib64");
SEARCH_DIR("/usr/lib64"); SEARCH_DIR("/usr/x86_64-redhat-linux/lib");
SEARCH_DIR("/usr/lib64"); SEARCH_DIR("/usr/local/lib");
SEARCH_DIR("/lib"); SEARCH_DIR("/usr/lib");
SECTIONS
{
+ .the.begin : {
+ *(__shareable_begin)
+ }
/* Read-only sections, merged into text segment: */
. = SEGMENT_START("text-segment", 0) + SIZEOF_HEADERS;
.note.gnu.build-id : { *(.note.gnu.build-id) }
@@ -195,6 +189,9 @@
*(.ldata .ldata.* .gnu.linkonce.l.*)
. = ALIGN(. != 0 ? 64 / 8 : 1);
}
+ .the.end : {
+ *(__shareable_end)
+ }
. = ALIGN(64 / 8);
_end = .; PROVIDE (end = .);
. = DATA_SEGMENT_END (.);
@@ -239,4 +236,3 @@
}
-==================================================
That may or may not have something to do with your problem, but it
probably bears looking into.
--
Jerry James
http://www.jamezone.org/
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