memcached closes the connection after std::bad_alloc when `/mcctl set trace.config` provides the empty list for disabled-categories.
[root@172-23-96-117 bin]# ./mcctl -h localhost:11210 -u Administrator -P password set trace.config 'buffer-mode:ring;buffer-size:20971520;enabled-categories:*;disabled-categories:mutex'
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[root@172-23-96-117 bin]# ./mcctl -h localhost:11210 -u Administrator -P password set trace.config 'buffer-mode:ring;buffer-size:20971520;enabled-categories:*;disabled-categories:'
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MemcachedConnection::readPlain: failed to read data: Connection reset by peer
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[root@172-23-96-117 bin]# ./mcctl -h localhost:11210 -u Administrator -P password get trace.config
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buffer-mode:ring;buffer-size:20971520;enabled-categories:*;disabled-categories:mutex
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Seen on http://perf.jenkins.couchbase.com/job/hera/1829. From memcached.log:
2018-07-04T10:07:54.750273Z WARNING 282: exception occurred in runloop during packet execution. Cookie info: {"connection":"[ 127.0.0.1:46108 - 127.0.0.1:11210 (<ud>Administrator</ud>) ]","packet":{"bodylen":91,"
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cas":0,"datatype":"raw","extlen":0,"keylen":12,"magic":"ClientRequest","opaque":3735928559,"opcode":"IOCTL_SET","vbucket":0}} - closing connection: std::bad_alloc
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UPDATE 2018/07/06
A temporary workaround to remove everything from the disabled-categories list is to set a single not-existing category:
[root@172-23-96-117 bin]# ./mcctl -h localhost:11210 -u Administrator -P password set trace.config 'buffer-mode:ring;buffer-size:20971520;enabled-categories:*;disabled-categories:fake-category'
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[root@172-23-96-117 bin]# ./mcctl -h localhost:11210 -u Administrator -P password get trace.config
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buffer-mode:ring;buffer-size:20971520;enabled-categories:*;disabled-categories:fake-category
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[root@172-23-96-117 bin]# ./kv_trace_dump --mcctl ./mcctl -H localhost:11210 -u Administrator -P password ./trace.json
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[root@172-23-96-117 bin]# grep "mutex" trace.json | wc -l
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884
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Minor