Bug was reproduced on Fedora x86_64 release vesrsion
oleg.tsarev (0) /storage/dev/percona/5.5.12/Percona-Server-release/mysql-test$ ./mysql-test-run main.percona_xtradb_bug317074 --valgrind
Logging: /storage/dev/percona/5.5.12/Percona-Server/mysql-test/mysql-test-run.pl main.percona_xtradb_bug317074 --valgrind
110602 18:25:11 [Note] Flashcache bypass: disabled
110602 18:25:11 [Note] Flashcache setup error is : open flash device failed

MySQL Version 5.5.12
Turning on valgrind for all executables
Running valgrind with options " --show-reachable=yes "
Checking supported features...
 - skipping ndbcluster
 - skipping SSL, mysqld not compiled with SSL
Collecting tests...
vardir: /storage/dev/percona/5.5.12/Percona-Server-release/mysql-test/var
Removing old var directory...
Creating var directory '/storage/dev/percona/5.5.12/Percona-Server-release/mysql-test/var'...
Installing system database...
Using server port 48481

==============================================================================

TEST RESULT TIME (ms) or COMMENT
--------------------------------------------------------------------------

worker[1] Using MTR_BUILD_THREAD 300, with reserved ports 13000..13009
main.percona_xtradb_bug317074 [ pass ] 255714
worker[1] Valgrind report from /storage/dev/percona/5.5.12/Percona-Server-release/mysql-test/var/log/mysqld.1.err after tests:
 main.percona_xtradb_bug317074
--------------------------------------------------------------------------
HEAP SUMMARY:
    in use at exit: 30,570,344 bytes in 207 blocks
  total heap usage: 1,464,025 allocs, 1,463,818 frees, 7,849,406,315 bytes allocated

128 bytes in 1 blocks are possibly lost in loss record 107 of 136
   at 0x4A05E46: malloc (vg_replace_malloc.c:195)
   by 0x932408: mem_area_alloc (mem0pool.c:385)
   by 0x93168E: mem_heap_create_block (mem0mem.c:333)
   by 0x89F23E: btr_search_sys_create (mem0mem.ic:443)
   by 0x8A9B23: buf_pool_init (buf0buf.c:1902)
   by 0x85D4DA: innobase_start_or_create_for_mysql (srv0start.c:1511)
   by 0x82068C: innobase_init(void*) (ha_innodb.cc:2858)
   by 0x688197: ha_initialize_handlerton(st_plugin_int*) (handler.cc:462)
   by 0x58A889: plugin_initialize(st_plugin_int*) (sql_plugin.cc:1063)
   by 0x58FA87: plugin_init(int*, char**, int) (sql_plugin.cc:1349)
   by 0x50EE25: init_server_components() (mysqld.cc:3962)
   by 0x51259C: mysqld_main(int, char**) (mysqld.cc:4634)
   by 0x37E701EE5C: (below main) (libc-start.c:226)

128 bytes in 1 blocks are definitely lost in loss record 109 of 136
   at 0x4A05E46: malloc (vg_replace_malloc.c:195)
   by 0x932408: mem_area_alloc (mem0pool.c:385)
   by 0x93168E: mem_heap_create_block (mem0mem.c:333)
   by 0x89F2CF: btr_search_sys_create (mem0mem.ic:443)
   by 0x8A9B23: buf_pool_init (buf0buf.c:1902)
   by 0x85D4DA: innobase_start_or_create_for_mysql (srv0start.c:1511)
   by 0x82068C: innobase_init(void*) (ha_innodb.cc:2858)
   by 0x688197: ha_initialize_handlerton(st_plugin_int*) (handler.cc:462)
   by 0x58A889: plugin_initialize(st_plugin_int*) (sql_plugin.cc:1063)
   by 0x58FA87: plugin_init(int*, char**, int) (sql_plugin.cc:1349)
   by 0x50EE25: init_server_components() (mysqld.cc:3962)
   by 0x51259C: mysqld_main(int, char**) (mysqld.cc:4634)
   by 0x37E701EE5C: (below main) (libc-start.c:226)

LEAK SUMMARY:
   definitely lost: 128 bytes in 1 blocks
   indirectly lost: 0 bytes in 0 blocks
     possibly lost: 128 bytes in 1 blocks
   still reachable: 0 bytes in 0 blocks
        suppressed: 30,570,088 bytes in 205 blocks

For counts of detected and suppressed errors, rerun with: -v
ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 103 from 103)

--------------------------------------------------------------------------
The servers were restarted 0 times
Spent 255.714 of 278 seconds executing testcases

Completed: All 1 tests were successful.