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ctdb-scripts: Factor out function dump_stacks()

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Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
This commit is contained in:
Martin Schwenke 2021-02-12 19:14:12 +11:00 committed by Amitay Isaacs
parent f753e2f7ac
commit 55d4b3438f
1 changed files with 39 additions and 25 deletions
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64
ctdb/config/debug_locks.sh
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@ -28,6 +28,44 @@ fi
# Load/cache database options from configuration file
ctdb_get_db_options
dump_stack ()
{
_pid="$1"
echo "----- Stack trace for PID=${_pid} -----"
# x is intentionally ignored
# shellcheck disable=SC2034
read x x state x <"/proc/${_pid}/stat"
if [ "$state" = "D" ] ; then
# Don't run gstack on a process in D state since
# gstack will hang until the process exits D state.
# Although it is possible for a process to transition
# to D state after this check, it is unlikely because
# if a process is stuck in D state then it is probably
# the reason why this script was called. Note that a
# kernel stack almost certainly won't help diagnose a
# deadlock... but it will probably give us someone to
# blame!
echo "----- Process in D state, printing kernel stack only"
cat "/proc/${_pid}/stack"
else
gstack "$_pid"
fi
}
dump_stacks ()
{
_pids="$1"
# Use word splitting to squash whitespace
# shellcheck disable=SC2086
_pids=$(echo $_pids | tr ' ' '\n' | sort -u)
for _pid in $_pids; do
dump_stack "$_pid"
done
}
(
flock -n 9 || exit 1
@ -61,32 +99,8 @@ ctdb_get_db_options
pids=$(echo "$out" | grep -v "W$" | grep "$db" | grep -v ctdbd | awk '{print $1}')
all_pids="$all_pids $pids"
done
# Use word splitting to squash whitespace
# shellcheck disable=SC2086
pids=$(echo $all_pids | tr ' ' '\n' | sort -u)
# For each process waiting, log stack trace
for pid in $pids ; do
echo "----- Stack trace for PID=$pid -----"
# x is intentionally ignored
# shellcheck disable=SC2034
read x x state x <"/proc/${pid}/stat"
if [ "$state" = "D" ] ; then
# Don't run gstack on a process in D state since
# gstack will hang until the process exits D state.
# Although it is possible for a process to transition
# to D state after this check, it is unlikely because
# if a process is stuck in D state then it is probably
# the reason why this script was called. Note that a
# kernel stack almost certainly won't help diagnose a
# deadlock... but it will probably give us someone to
# blame!
echo "----- Process in D state, printing kernel stack only"
cat "/proc/${pid}/stack"
else
gstack "$pid"
fi
done
dump_stacks "$all_pids"
fi
echo "===== End of debug locks PID=$$ ====="