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perf callchain: Fix double mapping al->addr for children without self period

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Milian Wolff found a problem he described in [1] and that for him would
get fixed:

"Note how most of the large offset values are now gone. Most notably, we
get proper srcline resolution for the random.h and complex headers."

Then Namhyung found the root cause:

"I looked into it and found a bug handling cumulative (children)
entries.  For children entries that have no self period, the al->addr (so
he->ip) ends up having an doubly-mapped address.

It seems to be there from the beginning but only affects entries that
have no srclines - finding srcline itself is done using a different
address but it will show the invalid address if no srcline was found.  I
think we should fix the commit c7405d85d7 ("perf tools: Update cpumode
for each cumulative entry")."

[1] https://lkml.kernel.org/r/[email protected]

Reported-by: Milian Wolff <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
Tested-by: Milian Wolff <[email protected]>
Cc: Jin Yao <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: [email protected]
Fixes: c7405d85d7 ("perf tools: Update cpumode for each cumulative entry")
Link: https://lkml.kernel.org/r/20171020051533.GA2746@sejong
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Namhyung Kim 2017-10-20 14:15:33 +09:00 • committed by Arnaldo Carvalho de Melo
commit d6332a176b
1 changed files with 1 additions and 4 deletions
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5
tools/perf/util/callchain.c
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@ -1091,10 +1091,7 @@ int fill_callchain_info(struct addr_location *al, struct callchain_cursor_node *
al->map = node->map;
al->sym = node->sym;
al->srcline = node->srcline;
if (node->map)
al->addr = node->map->map_ip(node->map, node->ip);
else
al->addr = node->ip;
al->addr = node->ip;
if (al->sym == NULL) {
if (hide_unresolved)