Dear Masahiro: 1. The cause of the problem When I am doing RCU torture test: #git clone https://kernel.source.codeaurora.cn/pub/scm/linux/kernel/git/paulmck/linux-rcu.git #cd linux-rcu #git checkout remotes/origin/pmladek.2022.06.15a #./tools/testing/selftests/rcutorture/bin/torture.sh The kernel building report error something in both Dell PowerEdge R720 and Thinkpad T14 (Amd). For example: /mnt/rcu/linux-rcu/tools/testing/selftests/rcutorture/res/2022.06.27-10.42.37-torture# find . -name Make.out|xargs grep Error ./results-rcutorture-kasan/RUDE01/Make.out:make[2]: *** [scripts/Makefile.build:257: kernel/trace/power-traces.o] Error 255 2. I trace the problem to check-local-export I add some echo statement in Makefile.build diff --git a/scripts/Makefile.build b/scripts/Makefile.build index 1f01ac65c0cd..0d48a2d3efff 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -227,13 +227,21 @@ cmd_check_local_export = $(srctree)/scripts/check-local-export $@ define rule_cc_o_c $(call cmd_and_fixdep,cc_o_c) + echo "after fixdep $$? $<" $(call cmd,gen_ksymdeps) + echo "after gen_ksymdeps $$? $<" $(call cmd,check_local_export) + echo "after check_local_export $$? $<" $(call cmd,checksrc) + echo "after checksrc $$? $<" $(call cmd,checkdoc) + echo "after checkdoc $$? $<" $(call cmd,gen_objtooldep) + echo "after gen_objtooldep $$? $<" $(call cmd,gen_symversions_c) + echo "after gen_symversions $$? $<" $(call cmd,record_mcount) + echo "after record_mcount $$? $<" endef Then I rerun the torture.sh The result show it is check_local_export did not continue in all failed builds. 3. I trace into wait statement in check-local-export diff --git a/scripts/check-local-export b/scripts/check-local-export index da745e2743b7..d35477d95bdc 100755 --- a/scripts/check-local-export +++ b/scripts/check-local-export @@ -12,7 +12,7 @@ declare -A symbol_types declare -a export_symbols exit_code=0 - +echo "check-local-export L15 ${0} ${1}" while read value type name do # Skip the line if the number of fields is less than 3. @@ -50,9 +50,10 @@ do # done < <(${NM} --quiet ${1}) done < <(${NM} ${1} 2>/dev/null || { echo "${0}: ${NM} failed" >&2; false; } ) +echo "check-local-export L53 ${0} ${1}" # Catch error in the process substitution wait $! - +echo "check-local-export L56 ${0} ${1} $! $?" for name in "${export_symbols[@]}" do # nm(3) says "If lowercase, the symbol is usually local" @@ -61,5 +62,9 @@ do exit_code=1 fi done - +if [ ${exit_code} -ne 0 ] ; then + echo "Zhouyi Zhou" + echo ${exit_code} +fi +echo "check-local-export L69 $? ${exit_code}" exit ${exit_code} Then I rerun the torture.sh The result show it is wait $! in all failed builds because in all failed cases, there is L53, but no L56 4. I look into source code of wait command #wget http://ftp.gnu.org/gnu/bash/bash-5.0.tar.gz #tar zxf tar zxf bash-5.0.tar.gz I found that there are QUIT statements in realization of function wait_for 5. My Guess wait statement in check-local-export may cause bash to quit I am very interested in this problem, but I am a rookie, I am very glad to proceed the investigation with your further directions. Sorry to have brought you so much trouble. Kind Regard Thank you very much Zhouyi
