perf srcline: Add a timeout to reading from addr2line

addr2line may fail to send expected values causing perf to wait
indefinitely. Add a 1 second timeout (twice the timeout for reading from
/proc/pid/maps) so that such reads don't cause perf to appear to lock
up.

There are already checks that the file for addr2line contains a debug
section but this isn't always sufficient. The problem was observed when
a valid elf file would set the configuration for binutils addr2line,
then a later read of vmlinux with ELF debug sections would cause a
failing write/read which would block indefinitely.

As a service to future readers, if the io hits eof or an error, cleanup
the addr2line process.

Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Yang Jihong <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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