perl ./mtr connect.json --valgrind-mysqld
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==15874== Thread 4:
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==15874== Conditional jump or move depends on uninitialised value(s)
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==15874== at 0x4C2D1EF: strcpy (mc_replace_strmem.c:443)
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==15874== by 0xCDB9495: AllocateValue(_global*, VALUE*, int, int) (value.cpp:447)
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==15874== by 0xCD94B65: JSONCOL::ParseJpath(_global*) (tabjson.cpp:543)
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==15874== by 0xCD939D0: TDBJSN::MakeCol(_global*, COLDEF*, COLBLK*, int) (tabjson.cpp:172)
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==15874== by 0xCD986C3: TDBASE::ColDB(_global*, char*, int) (table.cpp:246)
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==15874== by 0xCD46D03: CntOpenTable(_global*, TDB*, MODE, char*, char*, bool, ha_connect*) (connect.cc:280)
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==15874== by 0xCD35CEC: ha_connect::OpenTable(_global*, bool) (ha_connect.cc:1735)
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==15874== by 0xCD3B2B2: ha_connect::rnd_init(bool) (ha_connect.cc:3460)
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==15874== by 0x5F11C2: handler::ha_rnd_init(bool) (handler.h:2626)
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==15874== by 0x85E280: handler::ha_rnd_init_with_error(bool) (handler.cc:2711)
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==15874== by 0x99201E: init_read_record(READ_RECORD*, THD*, TABLE*, SQL_SELECT*, int, bool, bool) (records.cc:278)
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==15874== by 0x6C049E: join_init_read_record(st_join_table*) (sql_select.cc:18665)
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==15874== by 0x6BE500: sub_select(JOIN*, st_join_table*, bool) (sql_select.cc:17775)
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==15874== by 0x6BDDE2: do_select(JOIN*, List<Item>*, TABLE*, Procedure*) (sql_select.cc:17440)
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==15874== by 0x69984D: JOIN::exec_inner() (sql_select.cc:3081)
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==15874== by 0x696AED: JOIN::exec() (sql_select.cc:2370)
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- relates to
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MDEV-7069
Fix buildbot failures in main server trees
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-
Stalled
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Bug
The problem was not in AllocateValue but in the constructor of TYPVAL<PSZ> The new strg was widely uninitialised just by setting a terminated null char. Now the whole string is zero'ed.