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rcutorture: Add --kill-previous option to terminate previous kvm.sh runs

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When kvm.sh is killed, its child processes (make, gcc, qemu, etc.) may
continue running. This prevents new kvm.sh instances from starting even
though the parent is gone.

Add a --kill-previous option that uses fuser(1) to terminate all
processes holding the flock file before attempting to acquire it. This
provides a clean way to recover from stale/zombie kvm.sh runs which
sometimes may have lots of qemu and compiler processes still disturbing.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Tested-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
This commit is contained in:
Joel Fernandes 2026-01-01 11:34:17 -05:00 committed by Boqun Feng
parent a590a79d19
commit cf587c6ff2
1 changed files with 24 additions and 1 deletions
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25
tools/testing/selftests/rcutorture/bin/kvm.sh
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@ -80,6 +80,7 @@ usage () {
echo " --kasan"
echo " --kconfig Kconfig-options"
echo " --kcsan"
echo " --kill-previous"
echo " --kmake-arg kernel-make-arguments"
echo " --mac nn:nn:nn:nn:nn:nn"
echo " --memory megabytes|nnnG"
@ -206,6 +207,9 @@ do
--kcsan)
TORTURE_KCONFIG_KCSAN_ARG="$debuginfo CONFIG_KCSAN=y CONFIG_KCSAN_STRICT=y CONFIG_KCSAN_REPORT_ONCE_IN_MS=100000 CONFIG_KCSAN_VERBOSE=y CONFIG_DEBUG_LOCK_ALLOC=y CONFIG_PROVE_LOCKING=y"; export TORTURE_KCONFIG_KCSAN_ARG
;;
--kill-previous)
TORTURE_KILL_PREVIOUS=1
;;
--kmake-arg|--kmake-args)
checkarg --kmake-arg "(kernel make arguments)" $# "$2" '.*' '^error$'
TORTURE_KMAKE_ARG="`echo "$TORTURE_KMAKE_ARG $2" | sed -e 's/^ *//' -e 's/ *$//'`"
@ -278,6 +282,25 @@ done
# Prevent concurrent kvm.sh runs on the same source tree. The flock
# is automatically released when the script exits, even if killed.
TORTURE_LOCK="$RCUTORTURE/.kvm.sh.lock"
# Terminate any processes holding the lock file, if requested.
if test -n "$TORTURE_KILL_PREVIOUS"
then
if test -e "$TORTURE_LOCK"
then
echo "Killing processes holding $TORTURE_LOCK..."
if fuser -k "$TORTURE_LOCK" >/dev/null 2>&1
then
sleep 2
echo "Previous kvm.sh processes killed."
else
echo "No processes were holding the lock."
fi
else
echo "No lock file exists, nothing to kill."
fi
fi
if test -z "$dryrun"
then
# Create a file descriptor and flock it, so that when kvm.sh (and its
@ -287,7 +310,7 @@ then
then
echo "ERROR: Another kvm.sh instance is already running on this tree."
echo " Lock file: $TORTURE_LOCK"
echo " To run kvm.sh, kill all existing kvm.sh runs first."
echo " To run kvm.sh, kill all existing kvm.sh runs first (--kill-previous)."
exit 1
fi
fi