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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0+
#
# Extract any RCU CPU stall warnings present in specified file.
# Filter out clocksource lines. Note that preceding-lines excludes the
# initial line of the stall warning but trailing-lines includes it.
#
# Usage: extract-stall.sh dmesg-file [ preceding-lines [ trailing-lines ] ]
echo $1
preceding_lines="${2-3}"
trailing_lines="${3-10}"
awk -v preceding_lines="$preceding_lines" -v trailing_lines="$trailing_lines" '
suffix <= 0 {
for (i = preceding_lines; i > 0; i--)
last[i] = last[i - 1];
last[0] = $0;
}
suffix > 0 {
print $0;
suffix--;
if (suffix <= 0)
print "";
}
suffix <= 0 && /detected stall/ {
for (i = preceding_lines; i >= 0; i--)
if (last[i] != "")
print last[i];
suffix = trailing_lines;
}' < "$1" | tr -d '\015' | grep -v clocksource
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