I faced this issue in Percona 5.5.32


InnoDB: Warning: a long semaphore wait:
--Thread 1383676224 has waited at buf0buf.c line 2513 for 911.00 seconds the semaphore:
S-lock on RW-latch at 0x1c7781c8 '&buf_pool->page_hash_latch'
number of readers 0, waiters flag 0, lock_word: 100000
Last time read locked in file buf0buf.c line 2513
Last time write locked in file /mnt/workspace/percona-server-5.5-rpms/label_exp/centos5-64/target/BUILD/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0lru.c lin
e 1902
InnoDB: Warning: a long semaphore wait:
--Thread 1401514304 has waited at buf0buf.c line 2513 for 953.00 seconds the semaphore:
S-lock on RW-latch at 0x1c7781c8 '&buf_pool->page_hash_latch'
number of readers 0, waiters flag 0, lock_word: 100000
Last time read locked in file buf0buf.c line 2513
Last time write locked in file /mnt/workspace/percona-server-5.5-rpms/label_exp/centos5-64/target/BUILD/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0lru.c lin
e 1902
InnoDB: Warning: a long semaphore wait:
--Thread 1401248064 has waited at buf0buf.c line 2513 for 1033.0 seconds the semaphore:
S-lock on RW-latch at 0x1c7781c8 '&buf_pool->page_hash_latch'
number of readers 0, waiters flag 0, lock_word: 100000
Last time read locked in file buf0buf.c line 2513
Last time write locked in file /mnt/workspace/percona-server-5.5-rpms/label_exp/centos5-64/target/BUILD/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0lru.c line 1902
InnoDB: Warning: a long semaphore wait:
--Thread 1382877504 has waited at buf0buf.c line 2513 for 1033.0 seconds the semaphore:
S-lock on RW-latch at 0x1c7781c8 '&buf_pool->page_hash_latch'
number of readers 0, waiters flag 0, lock_word: 100000
Last time read locked in file buf0buf.c line 2513
Last time write locked in file /mnt/workspace/percona-server-5.5-rpms/label_exp/centos5-64/target/BUILD/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0lru.c line 1902
InnoDB: Warning: a long semaphore wait:
--Thread 1416689984 has waited at buf0buf.c line 2513 for 1026.0 seconds the semaphore:
S-lock on RW-latch at 0x1c7781c8 '&buf_pool->page_hash_latch'
number of readers 0, waiters flag 0, lock_word: 100000
Last time read locked in file buf0buf.c line 2513
Last time write locked in file /mnt/workspace/percona-server-5.5-rpms/label_exp/centos5-64/target/BUILD/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0lru.c line 1902
InnoDB: Warning: a long semaphore wait:
--Thread 1390598464 has waited at buf0buf.c line 2513 for 961.00 seconds the semaphore:
S-lock on RW-latch at 0x1c7781c8 '&buf_pool->page_hash_latch'
number of readers 0, waiters flag 0, lock_word: 100000
Last time read locked in file buf0buf.c line 2513
Last time write locked in file /mnt/workspace/percona-server-5.5-rpms/label_exp/centos5-64/target/BUILD/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0lru.c line 1902
InnoDB: Warning: a long semaphore wait:
--Thread 1393260864 has waited at buf0buf.c line 2513 for 1013.0 seconds the semaphore:
S-lock on RW-latch at 0x1c7781c8 '&buf_pool->page_hash_latch'
number of readers 0, waiters flag 0, lock_word: 100000
Last time read locked in file buf0buf.c line 2513
Last time write locked in file /mnt/workspace/percona-server-5.5-rpms/label_exp/centos5-64/target/BUILD/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0lru.c line 1902
InnoDB: Warning: a long semaphore wait:
--Thread 1375689024 has waited at buf0buf.c line 2513 for 989.00 seconds the semaphore:
S-lock on RW-latch at 0x1c7781c8 '&buf_pool->page_hash_latch'
number of readers 0, waiters flag 0, lock_word: 100000
Last time read locked in file buf0buf.c line 2513
Last time write locked in file /mnt/workspace/percona-server-5.5-rpms/label_exp/centos5-64/target/BUILD/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0lru.c line 1902
InnoDB: Warning: a long semaphore wait:
--Thread 1392195904 has waited at buf0buf.c line 2513 for 960.00 seconds the semaphore:
S-lock on RW-latch at 0x1c7781c8 '&buf_pool->page_hash_latch'
number of readers 0, waiters flag 0, lock_word: 100000
Last time read locked in file buf0buf.c line 2513
Last time write locked in file /mnt/workspace/percona-server-5.5-rpms/label_exp/centos5-64/target/BUILD/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0lru.c line 1902
InnoDB: Warning: a long semaphore wait:
--Thread 1408969024 has waited at buf0buf.c line 2513 for 971.00 seconds the semaphore:
S-lock on RW-latch at 0x1c7781c8 '&buf_pool->page_hash_latch'
number of readers 0, waiters flag 0, lock_word: 100000
Last time read locked in file buf0buf.c line 2513
Last time write locked in file /mnt/workspace/percona-server-5.5-rpms/label_exp/centos5-64/target/BUILD/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0lru.c line 1902
InnoDB: Warning: a long semaphore wait:
--Thread 1408702784 has waited at buf0buf.c line 2513 for 959.00 seconds the semaphore:
S-lock on RW-latch at 0x1c7781c8 '&buf_pool->page_hash_latch'
number of readers 0, waiters flag 0, lock_word: 100000
Last time read locked in file buf0buf.c line 2513
Last time write locked in file /mnt/workspace/percona-server-5.5-rpms/label_exp/centos5-64/target/BUILD/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0lru.c line 1902
InnoDB: Warning: a long semaphore wait:
--Thread 1410033984 has waited at buf0buf.c line 2513 for 959.00 seconds the semaphore:
S-lock on RW-latch at 0x1c7781c8 '&buf_pool->page_hash_latch'
number of readers 0, waiters flag 0, lock_word: 100000
Last time read locked in file buf0buf.c line 2513
Last time write locked in file /mnt/workspace/percona-server-5.5-rpms/label_exp/centos5-64/target/BUILD/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0lru.c line 1902
InnoDB: Warning: a long semaphore wait: