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I noticed that running an R16B03-1 node on an overloaded host produced
log entries like the following ones:
```
2014-08-22 21:52:31 =ERROR REPORT====
Error in process <0.24112.3> on node '[email protected]' with exit value: {{case_clause,{data,4711}},[{cpu_sup,get_uint32_measurement,2,[{file,"cpu_sup.erl"},{line,227}]},{cpu_sup,measurement_server_loop,1,[{file,"cpu_sup.erl"},{line,585}]}]}
```
```
===== ALIVE Fri Aug 22 21:50:14 CEST 2014
[os_mon] cpu supervisor port (cpu_sup): Erlang has closed
[os_mon] cpu supervisor port (cpu_sup): Erlang has closed
[os_mon] cpu supervisor port (cpu_sup): Erlang has closed
[os_mon] cpu supervisor port (cpu_sup): Erlang has closed
===== ALIVE Fri Aug 22 22:07:46 CEST 2014
```
I performed a code inspection on the `cpu_sup` module and I concluded
that the `case_clause` error shows a small issue in the `cpu_sup`
module, that happens when the port used in `cpu_sup` is slow to start
- as it may happen on an overloaded node.
The `cpu_sup` `gen_server` process keeps in its state the pid of an
unlinked process (called "measurement server" - see `cpu_sup:init/1`),
in order to do dirty stuff (e.g. reading the filesystem, running OS
commands) and start_link-ing & managing the connected process to a
port (called "port server" - see `measurement_server_init/0`). So the
process organization looks like this:
```
cpu_sup - measurement server - port server - port
```
When the measurement server start_links the port server (see
`port_server_start/0`) it sends a `{self(), ?ping}` message to it and
expects an answer within 6s, otherwise it returns `{error, timeout}`
rather than the pid. This has two issues:
* The measurement server keeps `{error, ...}` in its state as if it
were a pid - that makes no sense;
* A late `{Pid, {data,4711}}` response may arrive in the mailbox of
the measurement server, that will believe it to be a request to be
processed, causing a `case_clause` error.
This commit teaches the measurement server to check the success of the
initialization of the port server by matching on the return value of
`port_server_start/0` (renamed to `port_server_start_link/0` for the
sake of clarity) in order to fail earlier and with an error clearer
than `{case_clause,{data,4711}}`. In such case I expect the
measurement server to be restarted by the `cpu_sup` `gen_server` (see
`handle_call/3`) - as before.
BTW It is not clear to me when the `handle_info({'EXIT', _Port,
Reason}, State)` may be called (the `cpu_sup` `gen_server` does not
link to the measurement server) but I am leaving it.
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* ia/public_key/PBES2/OTP-11915:
public_key: Add encodeing functionality for PBES1 and PBES2
public_key: Add PBES1 decoding support
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OTP-12121
* vladdu/jinterface_fun_equals:
jinterface: fix bug in equality for OtpErlangFun
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* ia/inets/ipv6-tests:
inets: Enable ipv6 tests for httpd
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* marcus/OTP-17.2.1/mergefix:
Updated OTP version
Update release notes
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* egil/proc_lib-optimizations/OTP-12060:
stdlib: Update dependencies to erts-6.2
erts: Update preloaded erlang.beam
stdlib: Use erlang:fun_info_mfa/1 in proc_lib:init_p/3
erts: Test erlang:fun_info_mfa/1
erts: Introduce erlang:fun_info_mfa/1
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* nox/reedr-logging/OTP-12115:
Add number of entries to mnesia copy debug message
Add thread index to allocator enomem dump slogan
Add run queue index to process dump info
Add missing error string to syslog logging in epmd
Demote rare debug slogan of message discarding to debug build
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* ia/ssl/dialyzer-certificate_requests:
ssl: Fix boolean expression
ssl: Fix broken contract
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* lucafavatella/accept-ip-in-net_adm-names:
Refactor erl_epmd:names/1
Accept inet:ip_address() in net_adm:names/1
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Also fixed some cases where Dialyzer could crash due to reaching
system limits.
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Sometimes bogus warnings were generated for parametrized types.
Thanks to Krzesimir Sarnecki for pointing the bug out.
Also corrected warnings where the structure of opaque types were
exposed (thanks to Kostis for pointing the bug out).
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Simplify erl_epmd:names/1, keeping the same functionalities, relying
on inet:gethostbyname/1 being able to handle both atoms and strings.
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This change also simplifies the code avoiding a double (conditional)
call to inet:gethostbyname/1 (in net_adm:names/1 and then
erl_epmd:names/1).
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Now checks that if we have max_session sessions we could close one session and open a new one. That is checked both for parallel and non-parallel logins.
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maint
* ia/ssl/certificate_types/certificate_requests/OTP-12026:
public_key: Updated User Guide with ECC records
ssl: Make sure the correct ROOT-cert is used
ssl: Test ECDSA and improve test suite maintainability
public_key: Correct ASN1-type EcpkParameters in PEM handling
public_key: Correct ASN-1 spec
ssl: Correct handling of certificate_types in Certificate Requests
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* pascalchap/observer_issue:
correction of huge status bar
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When dealing with older certificates that does not indicate its signer
with a certificate extension, we must search the database for the issure.
Finding the issuer is not enough, we need to verify the signature
with the key in the found issuer cert.
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Use generated certs instead of hard coded
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OTP-12081
* tuncer/sanitizers:
Implement --enable-sanitizers[=sanitizers]
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FROM TLS 1.2 RFC:
The interaction of the certificate_types and
supported_signature_algorithms fields is somewhat complicated.
certificate_types has been present in TLS since SSLv3, but was
somewhat underspecified. Much of its functionality is superseded by
supported_signature_algorithms. The following rules apply:
- Any certificates provided by the client MUST be signed using a
hash/signature algorithm pair found in
supported_signature_algorithms.
- The end-entity certificate provided by the client MUST contain a
key that is compatible with certificate_types. If the key is a
signature key, it MUST be usable with some hash/signature
algorithm pair in supported_signature_algorithms.
- For historical reasons, the names of some client certificate types
include the algorithm used to sign the certificate. For example,
in earlier versions of TLS, rsa_fixed_dh meant a certificate
signed with RSA and containing a static DH key. In TLS 1.2, this
functionality has been obsoleted by the
supported_signature_algorithms, and the certificate type no longer
restricts the algorithm used to sign the certificate. For
example, if the server sends dss_fixed_dh certificate type and
{{sha1, dsa}, {sha1, rsa}} signature types, the client MAY reply
with a certificate containing a static DH key, signed with RSA-
SHA1.
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following the last evolution - use wxStatusBar:new(Frame) then wxFrame:setStatusBar(Frame, StatusBar), the status bar use the full space available in frame.
move the creation of the status bar after the creation of the notebook and the mainsizer.
it is ok on windows 7 64bits, no other test done so far.
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* refs/heads/fetch-and-merge.maint-17-opu/FETCH_HEAD/54676: (46 commits)
Fix error printouts to not crash
Improve ct_snmp test cases
Fix misspelled community in manager
Rearrange test suite group structure
Fix testcase for really dual ip
Adjust test cases for daily builds
Fix call to non-existent function
Fix test manager in agent tests for IPv6
Call new Net-SNMP test suite from top suite
Improve external snmp commands args
Test inform to dual transports
Write list of trap targets
Improve dual stack test suite
Use {ipv6_v6only, true}
Remove commented out code
Add dual_ip tests in snmp_to_snmpnet_SUITE
Silence logging from agent net_if at shutdown
Rewrite agent for IPv4 + IPv6
snmp: Add inform test
snmp: Add new test suite
...
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* lars/orber/dual_ipv6_and_ipv4:
[orber] Fix bug in testcase
[orber] Fix malformed macros
[orber] Add test suite for ORB with dual ipv4/ipv6 configuration
[orber] Update documentation and fix testcase for IPv4/IPv6
[orber] Update testcases and fixed some minor faults
[orber] Remove unused file corba_request.erl
[orber] Remove a define of ORBVSN when compiling orbers erlang modules
[orber] Add possibilty to configure orber to run in both IPv4 and IPv6
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* lukas/os_mon/testfixes/OTP-12053:
os_mon: Fix so that all testcases are run
os_mon: Ignore posix_only on windows and solaris
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For some reason only a new testcases were run on the majority of
platforms. After this change all tests are run on all unix and win32
platforms.
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The sha of the original change is 52810718b
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