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74f8e22c15
In debian/ubuntu, libc.so is located at a different place, /lib/x86_64-linux-gnu/libc-2.23.so, so it outputs like this when testing: PING ::1(::1) 56 data bytes 64 bytes from ::1: icmp_seq=1 ttl=64 time=0.040 ms --- ::1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.040/0.040/0.040/0.000 ms 0.000 probe_libc:inet_pton:(7f0e2db741c0)) __GI___inet_pton (/lib/x86_64-linux-gnu/libc-2.23.so) getaddrinfo (/lib/x86_64-linux-gnu/libc-2.23.so) [0xffffa9d40f34ff4d] (/bin/ping) Fix up the libc path to make sure this test works in more OSes. Committer testing: When this test fails one can use 'perf test -v', i.e. in verbose mode, where it'll show the expected backtrace, so, after applying this test: On Fedora 26: # perf test -v ping 62: probe libc's inet_pton & backtrace it with ping : --- start --- test child forked, pid 23322 PING ::1(::1) 56 data bytes 64 bytes from ::1: icmp_seq=1 ttl=64 time=0.058 ms --- ::1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.058/0.058/0.058/0.000 ms 0.000 probe_libc:inet_pton:(7fe344310d80)) __GI___inet_pton (/usr/lib64/libc-2.25.so) getaddrinfo (/usr/lib64/libc-2.25.so) _init (/usr/bin/ping) test child finished with 0 ---- end ---- probe libc's inet_pton & backtrace it with ping: Ok # Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Kim Phillips <kim.phillips@arm.com> Cc: Li Zhijian <lizhijian@cn.fujitsu.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Philip Li <philip.li@intel.com> Link: http://lkml.kernel.org/r/1508315649-18836-1-git-send-email-lizhijian@cn.fujitsu.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
47 lines
1.4 KiB
Bash
Executable File
47 lines
1.4 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 $0)/lib/probe.sh
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ld=$(realpath /lib64/ld*.so.* | uniq)
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libc=$(echo $ld | sed 's/ld/libc/g')
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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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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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