d5c5e46aa7
The 'perf test' case "probe libc's inet_pton & backtrace it with ping"
fails on s390x. The reason is the 'realpath /lib64/ld*.so.* | uniq' line
which returns 2 libraries:
root@s35lp76 shell]# realpath /lib64/ld*.so.* | uniq
/usr/lib64/ld-2.26.so
/usr/lib64/ld_pre_smc.so.1.0.1
[root@s35lp76 shell]
This output makes the "perf probe" command lines invalid.
Use ldd tool to find out the libraries required by "bash" and check if
symbol "inet_pton" is part of the "libc" library. Some distros do not
have a /lib64 directory.
I have also added a check for the existence of an IPv6 network interface
before it is being used.
Committer changes:
We can't really use ldd for libc, as in some systems, such as x86_64, it
has hardlinks and then ldd sees one and the kernel the other, so grep
for libc in /proc/self/maps to get the one we'll receive from
PERF_RECORD_MMAP.
Thomas checked this change and acked it.
Signed-off-by: Thomas-Mich Richter <tmricht@linux.vnet.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Suggested-by: Hendrik Brückner <brueckner@linux.vnet.ibm.com>
Reviewed-by: Hendrik Brückner <brueckner@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20171114133409.GN8836@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
50 lines
1.6 KiB
Bash
Executable File
50 lines
1.6 KiB
Bash
Executable File
# probe libc's inet_pton & backtrace it with ping
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# Installs a probe on libc's inet_pton function, that will use uprobes,
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# then use 'perf trace' on a ping to localhost asking for just one packet
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# with the a backtrace 3 levels deep, check that it is what we expect.
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# This needs no debuginfo package, all is done using the libc ELF symtab
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# and the CFI info in the binaries.
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# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017
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. $(dirname $0)/lib/probe.sh
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libc=$(grep -w libc /proc/self/maps | head -1 | sed -r 's/.*[[:space:]](\/.*)/\1/g')
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nm -g $libc 2>/dev/null | fgrep -q inet_pton || exit 254
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trace_libc_inet_pton_backtrace() {
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idx=0
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expected[0]="PING.*bytes"
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expected[1]="64 bytes from ::1.*"
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expected[2]=".*ping statistics.*"
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expected[3]=".*packets transmitted.*"
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expected[4]="rtt min.*"
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expected[5]="[0-9]+\.[0-9]+[[:space:]]+probe_libc:inet_pton:\([[:xdigit:]]+\)"
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expected[6]=".*inet_pton[[:space:]]\($libc\)$"
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expected[7]="getaddrinfo[[:space:]]\($libc\)$"
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expected[8]=".*\(.*/bin/ping.*\)$"
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perf trace --no-syscalls -e probe_libc:inet_pton/max-stack=3/ ping -6 -c 1 ::1 2>&1 | grep -v ^$ | while read line ; do
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echo $line
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echo "$line" | egrep -q "${expected[$idx]}"
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if [ $? -ne 0 ] ; then
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printf "FAIL: expected backtrace entry %d \"%s\" got \"%s\"\n" $idx "${expected[$idx]}" "$line"
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exit 1
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fi
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let idx+=1
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[ $idx -eq 9 ] && break
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done
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}
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# Check for IPv6 interface existence
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ip a sh lo | fgrep -q inet6 || exit 2
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skip_if_no_perf_probe && \
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perf probe -q $libc inet_pton && \
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trace_libc_inet_pton_backtrace
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err=$?
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rm -f ${file}
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perf probe -q -d probe_libc:inet_pton
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exit $err
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