| Bug #81215 | Memory leak in main.udf | ||
|---|---|---|---|
| Submitted: | 27 Apr 2016 20:42 | Modified: | 28 Jun 2016 9:38 |
| Reporter: | Manuel Ung | Email Updates: | |
| Status: | Can't repeat | Impact on me: | |
| Category: | MySQL Server: User-defined functions ( UDF ) | Severity: | S3 (Non-critical) |
| Version: | 5.6 | OS: | Linux |
| Assigned to: | CPU Architecture: | Any | |
[28 Apr 2016 10:37]
MySQL Verification Team
Thank you for the bug report.
LEAK SUMMARY:
definitely lost: 0 bytes in 0 blocks
indirectly lost: 0 bytes in 0 blocks
possibly lost: 576 bytes in 1 blocks
still reachable: 72,704 bytes in 1 blocks
suppressed: 67,917,725 bytes in 1,373 blocks
For counts of detected and suppressed errors, rerun with: -v
ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 324 from 324)
valgrind_report [ fail ]
Test ended at 2016-04-27 19:36:16
[28 Jun 2016 9:38]
Arun Kuruvila
This bug is not reproducible on 5.6. Hence closing this bug as "Can't repeat". However the issue was seen in 5.7 which was fixed in 5.7.4
Description: The main.udf test occasionally fails in valgrind when calling dlclose on the loaded so file. 32 bytes in 1 blocks are still reachable in loss record 4 of 8 at 0x4C2D08A: calloc (in /lib/valgrind/vgpreload_memcheck-amd64-linux.so) by 0x66277BE: _dlerror_run (in /lib/libdl-2.20.so) by 0x662716E: dlclose (in /lib/libdl-2.20.so) by 0xD0229B: udf_free() (sql_udf.cc:273) by 0xA8A37B: clean_up(bool) (mysqld.cc:2094) by 0xA89F3D: unireg_end() (mysqld.cc:1951) by 0xA89E88: kill_server(void*) (mysqld.cc:1879) by 0xA89EA5: kill_server_thread (mysqld.cc:1902) by 0x529A7F0: start_thread (in /lib/libpthread-2.20.so) by 0x6F7046C: clone (in /lib/libc-2.20.so) It seems like the same problem was occurring for unloaded plugins as well. There should be an analogous fix for udfs. https://github.com/mysql/mysql-server/blob/5.7/mysql-test/valgrind.supp#L919-L931 The same bug was reported here: https://bugs.mysql.com/bug.php?id=35590 However, it was committed to 6.0 and for some reason, it was not backported to the 5.x releases. How to repeat: It's hard to repro, but: ./mtr --valgrind main.udf Suggested fix: Backport this fix: http://lists.mysql.com/commits/44571