[MDEV-8664] plugins.show_all_plugins --embedded fails in buildbot Created: 2015-08-22  Updated: 2023-11-29  Resolved: 2023-11-29

Status: Closed
Project: MariaDB Server
Component/s: Plugins, Tests
Affects Version/s: 10.1
Fix Version/s: N/A

Type: Bug Priority: Minor
Reporter: Elena Stepanova Assignee: Unassigned
Resolution: Won't Fix Votes: 0
Labels: None

Issue Links:
Relates
relates to MDEV-7069 Fix buildbot failures in main server ... Stalled

 Description   

http://buildbot.askmonty.org/buildbot/builders/kvm-fulltest/builds/4697/steps/test_5/logs/stdio

plugins.show_all_plugins                 w1 [ fail ]
 
        Test ended at 2015-08-21 22:11:44
 
 
 
CURRENT_TEST: plugins.show_all_plugins
 
mysqltest got signal 6
 
read_command_buf (0x13e1ce0): 
conn->name (0x37604e8): 
conn->cur_query (0x3850878): select variable_value > 10 from information_schema.global_status where variable_name like '%libraries%'
 
Attempting backtrace...
 
stack_bottom = 0x0 thread_stack 0x48000
 
mysys/stacktrace.c:247(my_print_stacktrace)[0x55778b]
 
bits/stdio2.h:99(dump_backtrace)[0x53bce9]
 
/lib/x86_64-linux-gnu/libpthread.so.0(+0xfcb0)[0x7fd7dbdb7cb0]
 
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35)[0x7fd7da7b3445]
 
/lib/x86_64-linux-gnu/libc.so.6(abort+0x17b)[0x7fd7da7b6bab]
 
/lib/x86_64-linux-gnu/libc.so.6(+0x73e2e)[0x7fd7da7f0e2e]
 
/lib/x86_64-linux-gnu/libc.so.6(__libc_fatal+0x1e)[0x7fd7da7f0efe]
 
/lib/x86_64-linux-gnu/libpthread.so.0(+0x10491)[0x7fd7dbdb8491]
 
/lib/x86_64-linux-gnu/libpthread.so.0(+0x1057c)[0x7fd7dbdb857c]
 
/lib/x86_64-linux-gnu/libpthread.so.0(__pthread_unwind+0x40)[0x7fd7dbdb66a0]
 
/lib/x86_64-linux-gnu/libpthread.so.0(+0x8ff5)[0x7fd7dbdb0ff5]
 
client/mysqltest.cc:907(connection_thread)[0x53be3f]
 
/lib/x86_64-linux-gnu/libpthread.so.0(+0x7e9a)[0x7fd7dbdafe9a]
 
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fd7da86f4bd]
 
Writing a core file...
 
 
 
 - saving '/mnt/buildbot/build/mariadb-10.1.6/mysql-test/var/1/log/plugins.show_all_plugins/' to '/mnt/buildbot/build/mariadb-10.1.6/mysql-test/var/log/plugins.show_all_plugins/'
 
 
 
Retrying test plugins.show_all_plugins, attempt(2/3)...
 
 
 
worker[1] > Restart  - not started
 
libgcc_s.so.1 must be installed for pthread_cancel to work

I can reproduce it on my local machine if I build the server the same way buildbot does (including the message about libgcc_s.so.1 which I don't understand, as I have the library).

 Comments   
Comment by Elena Stepanova [ 2015-08-22 ]

According to the cross-reference report, it started happening around here: http://buildbot.askmonty.org/buildbot/builders/kvm-fulltest/builds/4569

Comment by Sergei Golubchik [ 2015-08-22 ]

Just for the reference, what I've found so far.
The culprit here is Mroonga. The test doesn't install it, but it dlopen()'s ha_mroonga.so and that's enough. In --embedded test run this seem to somehow corrupt internal dynamic linker data sructures (?) and later, it thinks that libgcc_s.so.1 failed to load.

Comment by Sergey Vojtovich [ 2015-09-17 ]

See also:
http://stackoverflow.com/questions/6591389/dlopen-works-second-time-on-bad-shared-library-on-ubuntu-11-04-does-the-right-t
https://sourceware.org/bugzilla/show_bug.cgi?id=14577

Micro test that triggers similar problem:

#include <stdio.h>
 
#include <dlfcn.h>
 
 
 
#define LIB "var/plugins/ha_innodb.so"
 
 
 
int main(void)
 
{
 
  void *handle= dlopen(LIB, RTLD_NOW);
 
  fprintf(stderr, "handle= %p, error= %s\n", handle, dlerror());
 
  handle= dlopen(LIB, RTLD_NOW);
 
  fprintf(stderr, "handle= %p, error= %s\n", handle, dlerror());
 
  return 0;
 
}

Comment by Sergey Vojtovich [ 2015-09-17 ]

I also managed to crash debug build with the following test:

mtr --embedded
 
--error 1126
 
INSTALL SONAME 'ha_mroonga';
 
--error 1126
 
INSTALL SONAME 'ha_mroonga';

Comment by Sergey Vojtovich [ 2015-09-17 ]

serg, please review patch for this bug.

Comment by Elena Stepanova [ 2015-09-22 ]

https://github.com/MariaDB/server/commit/ff03b96b0605ed054849bde343b40bde581d035d

svoj,

Please push the test change for now.
I don't know how much hope there is for the dlopen bug to be fixed (reported 3 years ago, modified 1+ year ago?), I'd vote for looking into possible workarounds on our side.

Comment by Sergey Vojtovich [ 2015-09-22 ]

Disabled plugins.show_all_plugins in embedded mode until dynamic linker is fixed.

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