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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abross...@reyl.com<mailto:abross...@reyl.com>
REYL & Cie SA
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