--Thread 158813 has waited at btr0cur.c line 402 for 272.00 seconds the semaphore:
S-lock on RW-latch at 0x931cad8 created in file buf0buf.c line 469
a writer (thread id 165988) has reserved it in mode  exclusive
number of readers 0, waiters flag 1
Last time read locked in file btr0sea.c line 767
Last time write locked in file buf0buf.c line 1674
InnoDB: ###### Starts InnoDB Monitor for 30 secs to print diagnostic info:
InnoDB: Pending preads 0, pwrites 0
InnoDB: ###### Diagnostic info printed to the standard error stream
InnoDB: Warning: a long semaphore wait:
--Thread 168038 has waited at btr0cur.c line 402 for 306.00 seconds the semaphore:
S-lock on RW-latch at 0x931cad8 created in file buf0buf.c line 469
a writer (thread id 165988) has reserved it in mode  exclusive
number of readers 0, waiters flag 1
Last time read locked in file btr0sea.c line 767
Last time write locked in file buf0buf.c line 1674
InnoDB: Warning: a long semaphore wait:
--Thread 164963 has waited at btr0cur.c line 402 for 306.00 seconds the semaphore:
S-lock on RW-latch at 0x931cad8 created in file buf0buf.c line 469
a writer (thread id 165988) has reserved it in mode  exclusive
number of readers 0, waiters flag 1
Last time read locked in file btr0sea.c line 767
Last time write locked in file buf0buf.c line 1674
InnoDB: Warning: a long semaphore wait:
--Thread 165988 has waited at btr0cur.c line 402 for 304.00 seconds the semaphore:
S-lock on RW-latch at 0x931cad8 created in file buf0buf.c line 469
a writer (thread id 165988) has reserved it in mode  exclusive
number of readers 0, waiters flag 1
Last time read locked in file btr0sea.c line 767
Last time write locked in file buf0buf.c line 1674
InnoDB: Warning: a long semaphore wait:
--Thread 158813 has waited at btr0cur.c line 402 for 304.00 seconds the semaphore:
S-lock on RW-latch at 0x931cad8 created in file buf0buf.c line 469
a writer (thread id 165988) has reserved it in mode  exclusive
number of readers 0, waiters flag 1
Last time read locked in file btr0sea.c line 767
Last time write locked in file buf0buf.c line 1674
InnoDB: ###### Starts InnoDB Monitor for 30 secs to print diagnostic info:
InnoDB: Pending preads 0, pwrites 0
InnoDB: ###### Diagnostic info printed to the standard error stream