Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Fixed
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10.0, 10.1, 10.2, 10.3, 10.4, 10.5
Description
The write-heavy test innodb_zip.wl6501_scale_1 timed out on 10.2 60d7011c5f6ebda057d3e730c6f67519a1fb7f0c for me. Out of os_aio_n_segments=6, 5 are waiting for an event in os_aio_simulated_handler(). One thread is waiting for a write to complete in buf_dblwr_add_to_batch(), but that will never happen, because nothing is waking up the simulated AIO handler threads. The following patch should fix it:
diff --git a/storage/innobase/buf/buf0dblwr.cc b/storage/innobase/buf/buf0dblwr.cc
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index 36054dbf9fe..32b4399b41d 100644
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--- a/storage/innobase/buf/buf0dblwr.cc
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+++ b/storage/innobase/buf/buf0dblwr.cc
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@@ -1,7 +1,7 @@
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/*****************************************************************************
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Copyright (c) 1995, 2017, Oracle and/or its affiliates. All Rights Reserved.
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-Copyright (c) 2013, 2019, MariaDB Corporation.
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+Copyright (c) 2013, 2020, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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@@ -963,6 +963,7 @@ buf_dblwr_flush_buffered_writes(void)
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ib_int64_t sig_count = os_event_reset(buf_dblwr->b_event);
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mutex_exit(&buf_dblwr->mutex);
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+ os_aio_simulated_wake_handler_threads();
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os_event_wait_low(buf_dblwr->b_event, sig_count);
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goto try_again;
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}
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@@ -1096,6 +1097,7 @@ buf_dblwr_add_to_batch(
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checkpoint. */
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ib_int64_t sig_count = os_event_reset(buf_dblwr->b_event);
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mutex_exit(&buf_dblwr->mutex);
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+ os_aio_simulated_wake_handler_threads();
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os_event_wait_low(buf_dblwr->b_event, sig_count);
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goto try_again; |
(And the same for XtraDB in 10.1.)
This hang appears to have been introduced in MySQL 5.6.12.