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perf callchain: Reference count maps
If dso__load_kcore frees all of the existing maps, but one has already
been attached to a callchain cursor node, then we can get a SIGSEGV in
any function that happens to try to use this invalid cursor. Use the
existing map refcount mechanism to forestall cleanup of a map until the
cursor iterates past the node.
Signed-off-by: Krister Johansen <kjlx@templeofstupid.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: stable@kernel.org
Fixes: 84c2cafa28
("perf tools: Reference count struct map")
Link: http://lkml.kernel.org/r/20170106062331.GB2707@templeofstupid.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
parent
c0621acf45
commit
9c68ae98c6
@ -449,7 +449,7 @@ fill_node(struct callchain_node *node, struct callchain_cursor *cursor)
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}
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call->ip = cursor_node->ip;
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call->ms.sym = cursor_node->sym;
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call->ms.map = cursor_node->map;
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call->ms.map = map__get(cursor_node->map);
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if (cursor_node->branch) {
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call->branch_count = 1;
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@ -489,6 +489,7 @@ add_child(struct callchain_node *parent,
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list_for_each_entry_safe(call, tmp, &new->val, list) {
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list_del(&call->list);
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map__zput(call->ms.map);
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free(call);
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}
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free(new);
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@ -773,6 +774,7 @@ merge_chain_branch(struct callchain_cursor *cursor,
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list->ms.map, list->ms.sym,
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false, NULL, 0, 0);
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list_del(&list->list);
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map__zput(list->ms.map);
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free(list);
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}
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@ -823,7 +825,8 @@ int callchain_cursor_append(struct callchain_cursor *cursor,
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}
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node->ip = ip;
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node->map = map;
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map__zput(node->map);
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node->map = map__get(map);
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node->sym = sym;
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node->branch = branch;
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node->nr_loop_iter = nr_loop_iter;
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@ -1154,11 +1157,13 @@ static void free_callchain_node(struct callchain_node *node)
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list_for_each_entry_safe(list, tmp, &node->parent_val, list) {
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list_del(&list->list);
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map__zput(list->ms.map);
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free(list);
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}
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list_for_each_entry_safe(list, tmp, &node->val, list) {
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list_del(&list->list);
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map__zput(list->ms.map);
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free(list);
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}
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@ -1222,6 +1227,7 @@ int callchain_node__make_parent_list(struct callchain_node *node)
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goto out;
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*new = *chain;
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new->has_children = false;
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map__get(new->ms.map);
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list_add_tail(&new->list, &head);
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}
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parent = parent->parent;
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@ -1242,6 +1248,7 @@ int callchain_node__make_parent_list(struct callchain_node *node)
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out:
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list_for_each_entry_safe(chain, new, &head, list) {
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list_del(&chain->list);
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map__zput(chain->ms.map);
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free(chain);
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}
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return -ENOMEM;
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@ -5,6 +5,7 @@
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#include <linux/list.h>
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#include <linux/rbtree.h>
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#include "event.h"
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#include "map.h"
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#include "symbol.h"
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#define HELP_PAD "\t\t\t\t"
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@ -184,8 +185,13 @@ int callchain_merge(struct callchain_cursor *cursor,
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*/
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static inline void callchain_cursor_reset(struct callchain_cursor *cursor)
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{
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struct callchain_cursor_node *node;
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cursor->nr = 0;
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cursor->last = &cursor->first;
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for (node = cursor->first; node != NULL; node = node->next)
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map__zput(node->map);
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}
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int callchain_cursor_append(struct callchain_cursor *cursor, u64 ip,
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@ -1,6 +1,7 @@
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#include "util.h"
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#include "build-id.h"
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#include "hist.h"
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#include "map.h"
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#include "session.h"
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#include "sort.h"
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#include "evlist.h"
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@ -1019,6 +1020,10 @@ int hist_entry_iter__add(struct hist_entry_iter *iter, struct addr_location *al,
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int max_stack_depth, void *arg)
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{
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int err, err2;
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struct map *alm = NULL;
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if (al && al->map)
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alm = map__get(al->map);
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err = sample__resolve_callchain(iter->sample, &callchain_cursor, &iter->parent,
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iter->evsel, al, max_stack_depth);
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@ -1058,6 +1063,8 @@ out:
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if (!err)
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err = err2;
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map__put(alm);
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return err;
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}
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