Hello Mark,
Thank you!
devel/libelf was linked to the postgres binary
[0]lacey@talizorah:~$ ldd /usr/local/bin/postgres
/usr/local/bin/postgres:
libelf.so.0 => /usr/local/lib/libelf.so.0 (0x800d89000)
libintl.so.8 => /usr/local/lib/libintl.so.8 (0x800fa2000)
libxml2.so.2 => /usr/local/lib/libxml2.so.2 (0x8011ad000)
libpam.so.5 => /usr/lib/libpam.so.5 (0x801541000)
libicuuc.so.53 => /usr/local/lib/libicuuc.so.53 (0x80174d000)
libicui18n.so.53 => /usr/local/lib/libicui18n.so.53 (0x801adf000)
libssl.so.7 => /usr/lib/libssl.so.7 (0x801f51000)
libcrypto.so.7 => /lib/libcrypto.so.7 (0x8021bc000)
libm.so.5 => /lib/libm.so.5 (0x8025af000)
libthr.so.3 => /lib/libthr.so.3 (0x8027d7000)
libc.so.7 => /lib/libc.so.7 (0x8029fc000)
libz.so.6 => /lib/libz.so.6 (0x802da5000)
liblzma.so.5 => /usr/lib/liblzma.so.5 (0x802fbb000)
libicudata.so.53 => /usr/local/lib/libicudata.so.53 (0x8031e0000)
libc++.so.1 => /usr/lib/libc++.so.1 (0x8048c3000)
libcxxrt.so.1 => /lib/libcxxrt.so.1 (0x804b83000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x804d9f000)
[0]lacey@talizorah:~$
Once I removed that, and rebuilt PostgreSQL, per your suggestions, I
have 462 dtrace probes. =)
Many thanks for your clear and prompt reply. =)
Regards,
Lacey
On 12/21/2014 15:58, Mark Johnston wrote:
On Sun, Dec 21, 2014 at 03:22:25PM -0800, Lacey Powers wrote:
Hello Everyone,
I was attempting to build and use PostgreSQL with dtrace on FreeBSD 10.1 on
my home workstation.
It builds, and the binary works, but fails to register any probes.
After double checking that I had the dtraceall kernel module loaded,
changing permissions on /dev/dtrace/helper (0666), verifying that
devel/libelf was loaded, and digging around source code and Google for debug
flags, I'm at a loss for what else to do.
Here is the error:
[pgsql@talizorah ~]$ DTRACE_DOF_INIT_DEBUG=1 /usr/local/bin/postgres -D
/usr/local/pgsql/9.4/data
dtrace DOF postgres: elf_begin failed
LOG: ending log output to stderr
HINT: Future log output will go to log destination "syslog".
dtrace DOF postgres: DTrace ioctl failed to remove DOF (-1)
dtrace DOF postgres: DTrace ioctl failed to remove DOF (-1)
dtrace DOF postgres: DTrace ioctl failed to remove DOF (-1)
^Cdtrace DOF postgres: dtrace DOF postgres: DTrace ioctl failed to remove
DOF (-1)
DTrace ioctl failed to remove DOF (-1)
dtrace DOF postgres: DTrace ioctl failed to remove DOF (-1)
dtrace DOF postgres: DTrace ioctl failed to remove DOF (-1)
dtrace DOF postgres: DTrace ioctl failed to remove DOF (-1)
dtrace DOF postgres: DTrace ioctl failed to remove DOF (-1)
[pgsql@talizorah ~]$
Hi Lacey,
I've never seen this particular problem before. Could you post the
output of "ldd /usr/local/bin/postgres"? I've never tried using libelf
from ports, so perhaps there's a problem with it, assuming it is indeed
being used (as opposed to the base system's libelf).
If the ports libelf is being used (/usr/local/lib/libelf.so will show up
in the ldd ouput if so), could you try deleting devel/libelf, rebuilding
postgres, and trying again? If not, or if other packages require
devel/libelf on your system, could you apply the patch below, rebuild drti,
rebuild postgres (in that order), and try again?
To rebuild drti, cd to /usr/src/cddl/lib/drti and run
"make && make install".
Thanks!
-Mark
diff --git a/cddl/contrib/opensolaris/lib/libdtrace/common/drti.c
b/cddl/contrib/opensolaris/lib/libdtrace/common/drti.c
index ccd4f9b..eafc4c6 100644
--- a/cddl/contrib/opensolaris/lib/libdtrace/common/drti.c
+++ b/cddl/contrib/opensolaris/lib/libdtrace/common/drti.c
@@ -158,7 +158,7 @@ dtrace_dof_init(void)
return;
}
if ((e = elf_begin(efd, ELF_C_READ, NULL)) == NULL) {
- dprintf(1, "elf_begin failed\n");
+ dprintf(1, "elf_begin failed: %s\n", elf_errmsg(elf_errno()));
close(efd);
return;
}
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