Created
April 16, 2013 02:16
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Print multi thread process backtrace.
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#!/bin/sh | |
if test $# -ne 1; then | |
echo "Usage: `basename $0 .sh` <process-id>" 1>&2 | |
exit 1 | |
fi | |
if test ! -r /proc/$1; then | |
echo "Process $1 not found." 1>&2 | |
exit 1 | |
fi | |
# GDB doesn't allow "thread apply all bt" when the process isn't | |
# threaded; need to peek at the process to determine if that or the | |
# simpler "bt" should be used. | |
backtrace="bt" | |
if test -d /proc/$1/task ; then | |
# Newer kernel; has a task/ directory. | |
if test `/bin/ls /proc/$1/task | /usr/bin/wc -l` -gt 1 2>/dev/null ; then | |
backtrace="thread apply all bt" | |
fi | |
elif test -f /proc/$1/maps ; then | |
# Older kernel; go by it loading libpthread. | |
if /bin/grep -e libpthread /proc/$1/maps > /dev/null 2>&1 ; then | |
backtrace="thread apply all bt" | |
fi | |
fi | |
GDB=${GDB:-/usr/bin/gdb} | |
if $GDB -nx --quiet --batch --readnever > /dev/null 2>&1; then | |
readnever=--readnever | |
else | |
readnever= | |
fi | |
# Run GDB, strip out unwanted noise. | |
$GDB --quiet $readnever -nx /proc/$1/exe $1 <<EOF 2>&1 | | |
set width 0 | |
set height 0 | |
set pagination no | |
$backtrace | |
EOF | |
/bin/sed -n \ | |
-e 's/^\((gdb) \)*//' \ | |
-e '/^#/p' \ | |
-e '/^Thread/p' |
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