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<p>Happened again, it appears that code_server is wedged:</p>
<p><br>
</p>
<p></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;">admin@plexxi:~$ doErlangFun "erlang:process_info(whereis(code_server))."</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;">[{registered_name,code_server},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {current_function,{code_server,cpc_recv,4}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {initial_call,{erlang,apply,2}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {status,waiting},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {message_queue_len,23},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {messages,[{code_call,<6805.4097.0>,{ensure_loaded,switch_type_module}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.4146.0>,{ensure_loaded,switch_type_module}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.941.0>,{ensure_loaded,pc_port_autoneg}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.541.0>,{ensure_loaded,plexxiStatistics_types}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.520.0>,{ensure_loaded,switch_type_module}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.5123.0>,{ensure_loaded,secondary_erlang_node}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.5122.0>,{ensure_loaded,secondary_erlang_node}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.5162.0>,{ensure_loaded,icmp}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.5321.0>,</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {ensure_loaded,mac_entries_record_handler}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.5483.0>,{ensure_loaded,icmp}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.6647.0>,{ensure_loaded,icmp}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.7232.0>,{ensure_loaded,icmp}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.7274.0>,{ensure_loaded,icmp}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.7304.0>,{ensure_loaded,icmp}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.8889.0>,</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {ensure_loaded,mac_entries_record_handler}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.8951.0>,</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {ensure_loaded,mac_entries_record_handler}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.576.0>,</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {ensure_loaded,cross_connect_unicast_utils}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.19300.12>,{ensure_loaded,shell}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.20313.12>,{ensure_loaded,shell}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.21339.12>,{ensure_loaded,dbg}},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.31109.13>,get_mode},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {code_call,<6805.1255.14>,get_mode},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {system,{<6805.2521.14>,#Ref<6805.0.23.35356>},get_status}]},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {links,[<6805.11.0>]},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {dictionary,[{any_native_code_loaded,false}]},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {trap_exit,true},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {error_handler,error_handler},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {priority,normal},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {group_leader,<6805.9.0>},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {total_heap_size,86071},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {heap_size,10958},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {stack_size,25},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {reductions,13172282},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {garbage_collection,[{min_bin_vheap_size,46422},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {min_heap_size,233},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {fullsweep_after,65535},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {minor_gcs,71}]},</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;"> {suspending,[]}]</span></p>
<p style="margin: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo;">
<span style="font-variant-ligatures: no-common-ligatures;">admin@plexxi:~$ </span></p>
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<p></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> erlang-questions-bounces@erlang.org <erlang-questions-bounces@erlang.org> on behalf of Matthew Evans <mattevans123@hotmail.com><br>
<b>Sent:</b> Friday, December 9, 2016 9:56 AM<br>
<b>To:</b> Erlang/OTP discussions<br>
<b>Subject:</b> [erlang-questions] R17 - Possible wedged scheduler</font>
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<p>Hi,</p>
<p><br>
</p>
<p>We just hit a situation where it appeared that 1 scheduler was wedged. Some parts of our application were working, but others appeared to be stuck. I could connect via a cnode application and an escript, but I couldn't connect via the Erlang shell. We have
an escript that does rpc calls, some worked, others (e.g. anything to the code server or tracing failed) failed. </p>
<p><br>
</p>
<p>CPU load was minimal at the time, and heart didn't complain. We only have a single NIF, but this is not called on this hardware variant. We do use CNODE to talk to C applications.</p>
<p><br>
</p>
<p>We are running R17, Intel quad core CPU on Debian.</p>
<p><br>
</p>
<p>This is the first time this has been seen, so the questions are:</p>
<p><br>
</p>
<p>1. Has anyone seen this before?</p>
<p>2. What can we do if we hit this condition in the future to debug?</p>
<p>3. Since heart doesn't detect this can anyone think of any alternative mechanisms?</p>
<p><br>
</p>
<p>Thanks</p>
<p><br>
</p>
<p>Matt</p>
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