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memleak: make sure we catch children which are also "notleak".

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By not recursing into "notleak" children, we could miss other "notleak"
pointers:

```
2022-03-15T05:25:33.9759500Z lightningd-1: 2022-03-15T05:00:15.998Z **BROKEN** connectd: MEMLEAK: 0x55b29c3d0cc8
2022-03-15T05:25:33.9759901Z lightningd-1: 2022-03-15T05:00:16.003Z **BROKEN** connectd:   label=common/timeout.c:22:struct oneshot **NOTLEAK**
2022-03-15T05:25:33.9760195Z lightningd-1: 2022-03-15T05:00:16.003Z **BROKEN** connectd:   backtrace:
2022-03-15T05:25:33.9760555Z lightningd-1: 2022-03-15T05:00:16.003Z **BROKEN** connectd:     ccan/ccan/tal/tal.c:442 (tal_alloc_)
2022-03-15T05:25:33.9760905Z lightningd-1: 2022-03-15T05:00:16.003Z **BROKEN** connectd:     common/timeout.c:22 (new_reltimer_)
2022-03-15T05:25:33.9761272Z lightningd-1: 2022-03-15T05:00:16.003Z **BROKEN** connectd:     connectd/multiplex.c:558 (set_closing_timer)
2022-03-15T05:25:33.9761647Z lightningd-1: 2022-03-15T05:00:16.003Z **BROKEN** connectd:     connectd/multiplex.c:586 (write_to_peer)
2022-03-15T05:25:33.9761986Z lightningd-1: 2022-03-15T05:00:16.003Z **BROKEN** connectd:     ccan/ccan/io/io.c:59 (next_plan)
2022-03-15T05:25:33.9762335Z lightningd-1: 2022-03-15T05:00:16.004Z **BROKEN** connectd:     ccan/ccan/io/io.c:435 (io_do_always)
2022-03-15T05:25:33.9762692Z lightningd-1: 2022-03-15T05:00:16.004Z **BROKEN** connectd:     ccan/ccan/io/poll.c:304 (handle_always)
2022-03-15T05:25:33.9763035Z lightningd-1: 2022-03-15T05:00:16.004Z **BROKEN** connectd:     ccan/ccan/io/poll.c:385 (io_loop)
2022-03-15T05:25:33.9763376Z lightningd-1: 2022-03-15T05:00:16.004Z **BROKEN** connectd:     connectd/connectd.c:2131 (main)
2022-03-15T05:25:33.9763645Z lightningd-1: 2022-03-15T05:00:16.004Z **BROKEN** connectd:   parents:
2022-03-15T05:25:33.9764020Z lightningd-1: 2022-03-15T05:00:16.004Z **BROKEN** connectd:     ccan/ccan/io/io.c:91:struct io_conn **NOTLEAK**
2022-03-15T05:25:33.9764471Z lightningd-1: 2022-03-15T05:00:16.004Z **BROKEN** connectd:     connectd/connectd.c:2104:struct daemon
```

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2022-03-16 09:39:19 +10:30
parent 92fd97627d
commit 278ea6c8ac
1 changed files with 18 additions and 14 deletions
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32
common/memleak.c
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@ -267,21 +267,25 @@ static void call_memleak_helpers(struct htable *memtable, const tal_t *p)
for (i = tal_first(p); i; i = tal_next(i)) {
const char *name = tal_name(i);
if (name && strends(name, "struct memleak_helper")) {
const struct memleak_helper *mh = i;
mh->cb(memtable, p);
} else if (name && strends(name, " **NOTLEAK**")) {
pointer_referenced(memtable, i);
memleak_remove_region(memtable, i, tal_bytelen(i));
} else if (name && strends(name, " **NOTLEAK_IGNORE_CHILDREN**")) {
remove_with_children(memtable, i);
memleak_remove_region(memtable, i, tal_bytelen(i));
} else if (name && strends(name, "_notleak")) {
pointer_referenced(memtable, i);
call_memleak_helpers(memtable, i);
} else {
call_memleak_helpers(memtable, i);
if (name) {
if (strends(name, "struct memleak_helper")) {
const struct memleak_helper *mh = i;
mh->cb(memtable, p);
} else if (strends(name, " **NOTLEAK**")
|| strends(name, "_notleak")) {
pointer_referenced(memtable, i);
memleak_remove_region(memtable, i,
tal_bytelen(i));
} else if (strends(name,
" **NOTLEAK_IGNORE_CHILDREN**")) {
remove_with_children(memtable, i);
memleak_remove_region(memtable, i,
tal_bytelen(i));
}
}
/* Recurse down looking for "notleak" children */
call_memleak_helpers(memtable, i);
}
}