#!/bin/bash
#
# Here's how to use this:
#
# This script is used to help find functions that are being traced by function
# tracer or function graph tracing that causes the machine to reboot, hang, or
# crash. Here's the steps to take.
#
# First, determine if function tracing is working with a single function:
#
#   (note, if this is a problem with function_graph tracing, then simply
#    replace "function" with "function_graph" in the following steps).
#
#  # cd /sys/kernel/debug/tracing
#  # echo schedule > set_ftrace_filter
#  # echo function > current_tracer
#
# If this works, then we know that something is being traced that shouldn't be.
#
#  # echo nop > current_tracer
#
#  # cat available_filter_functions > ~/full-file
#  # ftrace-bisect ~/full-file ~/test-file ~/non-test-file
#  # cat ~/test-file > set_ftrace_filter
#
# *** Note *** this will take several minutes. Setting multiple functions is
# an O(n^2) operation, and we are dealing with thousands of functions. So go
# have  coffee, talk with your coworkers, read facebook. And eventually, this
# operation will end.
#
#  # echo function > current_tracer
#
# If it crashes, we know that ~/test-file has a bad function.
#
#   Reboot back to test kernel.
#
#     # cd /sys/kernel/debug/tracing
#     # mv ~/test-file ~/full-file
#
# If it didn't crash.
#
#     # echo nop > current_tracer
#     # mv ~/non-test-file ~/full-file
#
# Get rid of the other test file from previous run (or save them off somewhere).
#  # rm -f ~/test-file ~/non-test-file
#
# And start again:
#
#  # ftrace-bisect ~/full-file ~/test-file ~/non-test-file
#
# The good thing is, because this cuts the number of functions in ~/test-file
# by half, the cat of it into set_ftrace_filter takes half as long each
# iteration, so don't talk so much at the water cooler the second time.
#
# Eventually, if you did this correctly, you will get down to the problem
# function, and all we need to do is to notrace it.
#
# The way to figure out if the problem function is bad, just do:
#
#  # echo <problem-function> > set_ftrace_notrace
#  # echo > set_ftrace_filter
#  # echo function > current_tracer
#
# And if it doesn't crash, we are done.
#
# If it does crash, do this again (there's more than one problem function)
# but you need to echo the problem function(s) into set_ftrace_notrace before
# enabling function tracing in the above steps. Or if you can compile the
# kernel, annotate the problem functions with "notrace" and start again.
#


if [ $# -ne 3 ]; then
  echo 'usage: ftrace-bisect full-file test-file  non-test-file'
  exit
fi

full=$1
test=$2
nontest=$3

x=`cat $full | wc -l`
if [ $x -eq 1 ]; then
	echo "There's only one function left, must be the bad one"
	cat $full
	exit 0
fi

let x=$x/2
let y=$x+1

if [ ! -f $full ]; then
	echo "$full does not exist"
	exit 1
fi

if [ -f $test ]; then
	echo -n "$test exists, delete it? [y/N]"
	read a
	if [ "$a" != "y" -a "$a" != "Y" ]; then
		exit 1
	fi
fi

if [ -f $nontest ]; then
	echo -n "$nontest exists, delete it? [y/N]"
	read a
	if [ "$a" != "y" -a "$a" != "Y" ]; then
		exit 1
	fi
fi

sed -ne "1,${x}p" $full > $test
sed -ne "$y,\$p" $full > $nontest
nux/net-next.git/commit/tools/arch/xtensa/include?id=f5a0aab84b74de68523599817569c057c7ac1622'>include</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='f5a0aab84b74de68523599817569c057c7ac1622'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>David Ahern &lt;dsa@cumulusnetworks.com&gt;</td><td class='right'>2016-12-29 15:29:03 -0800</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2016-12-29 22:27:23 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/arch/xtensa/include?id=f5a0aab84b74de68523599817569c057c7ac1622'>f5a0aab84b74de68523599817569c057c7ac1622</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/arch/xtensa/include?id=f5a0aab84b74de68523599817569c057c7ac1622'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=f5a0aab84b74de68523599817569c057c7ac1622'>321a7119a443d99853b4d3e747db583ad3a39912</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/arch/xtensa/include?id=f5a0aab84b74de68523599817569c057c7ac1622'>tools/arch/xtensa/include</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/arch/xtensa/include?id=2344ef3c86a7fe41f97bf66c7936001b6132860b'>2344ef3c86a7fe41f97bf66c7936001b6132860b</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/arch/xtensa/include?id=f5a0aab84b74de68523599817569c057c7ac1622&amp;id2=2344ef3c86a7fe41f97bf66c7936001b6132860b'>diff</a>)</td></tr></table>
<div class='commit-subject'>net: ipv4: dst for local input routes should use l3mdev if relevant</div><div class='commit-msg'>IPv4 output routes already use l3mdev device instead of loopback for dst's
if it is applicable. Change local input routes to do the same.

This fixes icmp responses for unreachable UDP ports which are directed
to the wrong table after commit 9d1a6c4ea43e4 because local_input
routes use the loopback device. Moving from ingress device to loopback
loses the L3 domain causing responses based on the dst to get to lost.

Fixes: 9d1a6c4ea43e4 ("net: icmp_route_lookup should use rt dev to
		       determine L3 domain")
Signed-off-by: David Ahern &lt;dsa@cumulusnetworks.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=f5a0aab84b74de68523599817569c057c7ac1622'>Diffstat</a> (limited to 'tools/arch/xtensa/include')</div><table summary='diffstat' class='diffstat'>