Re: set -a leads to truncated output from ps

[alex xmb sw ratchev]

try the ps arg w for full length ps output

why u set -a ?

On Thu, Jun 13, 2024, 3:29 PM Alain BROSSARD via Bug reports for the GNU
Bourne Again SHell <bug-bash@gnu.org> wrote:

> Configuration Information [Automatically generated, do not change]:
> Machine: x86_64
> OS: linux-gnu
> Compiler: gcc
> Compilation CFLAGS: -g -O2 -flto=auto -ffat-lto-objects -flto=auto
> -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security
> -Wall
> uname output: Linux admu01-rgr-gva 5.15.0-107-generic #117-Ubuntu SMP Fri
> Apr 26 12:26:49 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
> Machine Type: x86_64-pc-linux-gnu
>
> Bash Version: 5.1
> Patch Level: 16
> Release Status: release
>
> Description:
>
>    I encountered this bug while tracing an issue within a third-party bash
> script.
> The following command wasn't detecting that the Neo4j Java application was
> running:
>
> ps ax | grep java | grep -i
> "com.neo4j.server.enterprise.EnterpriseEntryPoint" | grep -v grep | awk
> '{print $1}'
>
>    In practice,   ps ax | grep java is sufficient to illustrate the issue
> as shown below.
>
>
> host:/$ set -a
>        #  first execution of ps works fine as shown next
> host:/$ ps ax | grep java | grep -v grep
> 645101 pts/2    Sl     8:14 /usr/lib/jvm/java-17-openjdk-amd64/bin/java
> -cp
> /icos/acm/apps/neo4j/plugins/*:/icos/acm/config/neo4j/*:/icos/acm/apps/neo4j/lib/*
> -XX:+UseG1GC -XX:-OmitStackTraceInFastThrow -XX:+AlwaysPreTouch
> -XX:+UnlockExperimentalVMOptions -XX:+TrustFinalNonStaticFields
> -XX:+DisableExplicitGC -Djdk.nio.maxCachedBufferSize=1024
> -Dio.netty.tryReflectionSetAccessible=true
> -Djdk.tls.ephemeralDHKeySize=2048
> -Djdk.tls.rejectClientInitiatedRenegotiation=true
> -XX:FlightRecorderOptions=stackdepth=256 -XX:+UnlockDiagnosticVMOptions
> -XX:+DebugNonSafepoints --add-opens=java.base/java.nio=ALL-UNNAMED
> --add-opens=java.base/java.io=ALL-UNNAMED 
> --add-opens=java.base/sun.nio.ch=ALL-UNNAMED
> -Dlog4j2.disable.jmx=true
> -Xlog:gc*,safepoint,age*=trace:file=/icos/acm/logs/neo4j/gc.log::filecount=5,filesize=20480k
> -Dfile.encoding=UTF-8 -Xms4194304k -Xmx8388608k
> com.neo4j.server.enterprise.EnterpriseEntryPoint
> --home-dir=/icos/acm/apps/neo4j --config-dir=/icos/acm/config/neo4j
>
>        # however, the second one has truncated output to the terminal width
> host:/$ ps ax | grep java | grep -v grep
> 645101 pts/2    Sl     8:14 /usr/lib/jvm/java-17-openjdk-amd64/bin/java
> -cp /icos/acm/apps/neo4j/plug
>
>      At this stage, only a restart of the bash shell seems to fix the
> issue. All output from ps is now truncated even when passed through a
> pipe.  I haven't found a work-around once this bug is triggered. I’ve
> compared the environment variables before and after and same for output
> from stty -a and found no difference.
>
>      Assigning to a variable within an 'if' or after either '||' or '&&'
> also triggers the problem. Example, the following code triggers the bug:
>
> icos%cobfm03-uat-gva[167] bash
>    # ps output is good
> host:/$ ps ax | grep java | grep -v grep
> 645101 pts/2    Sl     8:16 /usr/lib/jvm/java-17-openjdk-amd64/bin/java
> -cp
> /icos/acm/apps/neo4j/plugins/*:/icos/acm/config/neo4j/*:/icos/acm/apps/neo4j/lib/*
> -XX:+UseG1GC -XX:-OmitStackTraceInFastThrow -XX:+AlwaysPreTouch
> -XX:+UnlockExperimentalVMOptions -XX:+TrustFinalNonStaticFields
> -XX:+DisableExplicitGC -Djdk.nio.maxCachedBufferSize=1024
> -Dio.netty.tryReflectionSetAccessible=true
> -Djdk.tls.ephemeralDHKeySize=2048
> -Djdk.tls.rejectClientInitiatedRenegotiation=true
> -XX:FlightRecorderOptions=stackdepth=256 -XX:+UnlockDiagnosticVMOptions
> -XX:+DebugNonSafepoints --add-opens=java.base/java.nio=ALL-UNNAMED
> --add-opens=java.base/java.io=ALL-UNNAMED 
> --add-opens=java.base/sun.nio.ch=ALL-UNNAMED
> -Dlog4j2.disable.jmx=true
> -Xlog:gc*,safepoint,age*=trace:file=/icos/acm/logs/neo4j/gc.log::filecount=5,filesize=20480k
> -Dfile.encoding=UTF-8 -Xms4194304k -Xmx8388608k
> com.neo4j.server.enterprise.EnterpriseEntryPoint
> --home-dir=/icos/acm/apps/neo4j --config-dir=/icos/acm/config/neo4j
> host:/$ set -a
> host:/$ echo $PATH | grep -q reyl/scripts || PATH=${PATH}:/reyl/scripts
>    # ps output is now always truncated, even if/after we call ‘unset +a’.
> host:/$ ps ax | grep java | grep -v grep
> 645101 pts/2    Sl     8:16 /usr/lib/jvm/java-17-openjdk-amd64/bin/java
> -cp /icos/acm/apps/neo4j/plug
>
>    replace PATH= by  { PATH=... } also triggers the bug.  Using 'if' also
> triggers it.
>
> host:/$ ps ax | grep java | grep -v grep
> 645101 pts/2    Sl     8:17 /usr/lib/jvm/java-17-openjdk-amd64/bin/java
> -cp
> /icos/acm/apps/neo4j/plugins/*:/icos/acm/config/neo4j/*:/icos/acm/apps/neo4j/lib/*
> -XX:+UseG1GC -XX:-OmitStackTraceInFastThrow -XX:+AlwaysPreTouch
> -XX:+UnlockExperimentalVMOptions -XX:+TrustFinalNonStaticFields
> -XX:+DisableExplicitGC -Djdk.nio.maxCachedBufferSize=1024
> -Dio.netty.tryReflectionSetAccessible=true
> -Djdk.tls.ephemeralDHKeySize=2048
> -Djdk.tls.rejectClientInitiatedRenegotiation=true
> -XX:FlightRecorderOptions=stackdepth=256 -XX:+UnlockDiagnosticVMOptions
> -XX:+DebugNonSafepoints --add-opens=java.base/java.nio=ALL-UNNAMED
> --add-opens=java.base/java.io=ALL-UNNAMED 
> --add-opens=java.base/sun.nio.ch=ALL-UNNAMED
> -Dlog4j2.disable.jmx=true
> -Xlog:gc*,safepoint,age*=trace:file=/icos/acm/logs/neo4j/gc.log::filecount=5,filesize=20480k
> -Dfile.encoding=UTF-8 -Xms4194304k -Xmx8388608k
> com.neo4j.server.enterprise.EnterpriseEntryPoint
> --home-dir=/icos/acm/apps/neo4j --config-dir=/icos/acm/config/neo4j
> host:/$ set -a
> host:/$ if echo $PATH | grep -q java ; then
> > PATH=${PATH}:/reyl/scripts
> > fi
> host:/$ ps ax | grep java | grep -v grep
> 645101 pts/2    Sl     8:17 /usr/lib/jvm/java-17-openjdk-amd64/bin/java
> -cp /icos/acm/apps/neo4j/plug
> host:/$ exit
>
>
>       Work-around that works is to assign a variable within $( ) and set
> +a :
> host:/$ ps ax | grep java | grep -v grep
> 645101 pts/2    Sl     8:18 /usr/lib/jvm/java-17-openjdk-amd64/bin/java
> -cp
> /icos/acm/apps/neo4j/plugins/*:/icos/acm/config/neo4j/*:/icos/acm/apps/neo4j/lib/*
> -XX:+UseG1GC -XX:-OmitStackTraceInFastThrow -XX:+AlwaysPreTouch
> -XX:+UnlockExperimentalVMOptions -XX:+TrustFinalNonStaticFields
> -XX:+DisableExplicitGC -Djdk.nio.maxCachedBufferSize=1024
> -Dio.netty.tryReflectionSetAccessible=true
> -Djdk.tls.ephemeralDHKeySize=2048
> -Djdk.tls.rejectClientInitiatedRenegotiation=true
> -XX:FlightRecorderOptions=stackdepth=256 -XX:+UnlockDiagnosticVMOptions
> -XX:+DebugNonSafepoints --add-opens=java.base/java.nio=ALL-UNNAMED
> --add-opens=java.base/java.io=ALL-UNNAMED 
> --add-opens=java.base/sun.nio.ch=ALL-UNNAMED
> -Dlog4j2.disable.jmx=true
> -Xlog:gc*,safepoint,age*=trace:file=/icos/acm/logs/neo4j/gc.log::filecount=5,filesize=20480k
> -Dfile.encoding=UTF-8 -Xms4194304k -Xmx8388608k
> com.neo4j.server.enterprise.EnterpriseEntryPoint
> --home-dir=/icos/acm/apps/neo4j --config-dir=/icos/acm/config/neo4j
> host:/$ set -a
> host:/$ opta_is_set=$(echo $- | grep -q a && echo 1 )
>       # record whether -a is set or not, this must be done within $( ) or
> the bug gets triggered
> host:/$ set +a
>       #  change the PATH as required after unseting -a
> host:/$ echo $PATH | grep -q reyl/scripts ||  PATH=${PATH}:/reyl/scripts
>       #   no bug, ps output isn't truncated
> host:/$ ps ax | grep java | grep -v grep
> 645101 pts/2    Sl     8:19 /usr/lib/jvm/java-17-openjdk-amd64/bin/java
> -cp
> /icos/acm/apps/neo4j/plugins/*:/icos/acm/config/neo4j/*:/icos/acm/apps/neo4j/lib/*
> -XX:+UseG1GC -XX:-OmitStackTraceInFastThrow -XX:+AlwaysPreTouch
> -XX:+UnlockExperimentalVMOptions -XX:+TrustFinalNonStaticFields
> -XX:+DisableExplicitGC -Djdk.nio.maxCachedBufferSize=1024
> -Dio.netty.tryReflectionSetAccessible=true
> -Djdk.tls.ephemeralDHKeySize=2048
> -Djdk.tls.rejectClientInitiatedRenegotiation=true
> -XX:FlightRecorderOptions=stackdepth=256 -XX:+UnlockDiagnosticVMOptions
> -XX:+DebugNonSafepoints --add-opens=java.base/java.nio=ALL-UNNAMED
> --add-opens=java.base/java.io=ALL-UNNAMED 
> --add-opens=java.base/sun.nio.ch=ALL-UNNAMED
> -Dlog4j2.disable.jmx=true
> -Xlog:gc*,safepoint,age*=trace:file=/icos/acm/logs/neo4j/gc.log::filecount=5,filesize=20480k
> -Dfile.encoding=UTF-8 -Xms4194304k -Xmx8388608k
> com.neo4j.server.enterprise.EnterpriseEntryPoint
> --home-dir=/icos/acm/apps/neo4j --config-dir=/icos/acm/config/neo4j
>       #    as part of the work-around, we reset -a to its prior state and
> continue
> host:/$ [ $opta_is_set == 1 ] && set -a
> host:/$ unset -v opta_is_set
>
>
> Repeat-By:
>
> set -a
> ps as | grep 'find a long line'
> # next ps output gets truncated and all subsequent executions until we
> exit the shell
> ps as | grep 'find a long line'
>
>
>
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> Alain BROSSARD
> System & Network Administrator
> Technology
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