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Properly handle tdata deletion race

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This commit is contained in:
Yinan Zhang 2020-01-16 20:38:46 -08:00
parent d331208560
commit 84b28c6a13
1 changed files with 16 additions and 14 deletions
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26
src/prof_data.c
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@ -1315,6 +1315,7 @@ static void
prof_tdata_destroy_locked(tsd_t *tsd, prof_tdata_t *tdata,
bool even_if_attached) {
malloc_mutex_assert_owner(tsd_tsdn(tsd), &tdatas_mtx);
malloc_mutex_assert_not_owner(tsd_tsdn(tsd), tdata->lock);
tdata_tree_remove(&tdatas, tdata);
@ -1432,10 +1433,6 @@ prof_tctx_should_destroy(tsd_t *tsd, prof_tctx_t *tctx) {
static void
prof_tctx_destroy(tsd_t *tsd, prof_tctx_t *tctx) {
prof_tdata_t *tdata = tctx->tdata;
prof_gctx_t *gctx = tctx->gctx;
bool destroy_tdata, destroy_tctx, destroy_gctx;
malloc_mutex_assert_owner(tsd_tsdn(tsd), tctx->tdata->lock);
assert(tctx->cnts.curobjs == 0);
@ -1444,9 +1441,21 @@ prof_tctx_destroy(tsd_t *tsd, prof_tctx_t *tctx) {
assert(tctx->cnts.accumobjs == 0);
assert(tctx->cnts.accumbytes == 0);
prof_gctx_t *gctx = tctx->gctx;
{
prof_tdata_t *tdata = tctx->tdata;
tctx->tdata = NULL;
ckh_remove(tsd, &tdata->bt2tctx, &gctx->bt, NULL, NULL);
destroy_tdata = prof_tdata_should_destroy(tsd_tsdn(tsd), tdata, false);
bool destroy_tdata = prof_tdata_should_destroy(tsd_tsdn(tsd),
tdata, false);
malloc_mutex_unlock(tsd_tsdn(tsd), tdata->lock);
if (destroy_tdata) {
prof_tdata_destroy(tsd, tdata, false);
}
}
bool destroy_tctx, destroy_gctx;
malloc_mutex_lock(tsd_tsdn(tsd), gctx->lock);
switch (tctx->state) {
@ -1493,13 +1502,6 @@ prof_tctx_destroy(tsd_t *tsd, prof_tctx_t *tctx) {
if (destroy_gctx) {
prof_gctx_try_destroy(tsd, prof_tdata_get(tsd, false), gctx);
}
malloc_mutex_assert_not_owner(tsd_tsdn(tsd), tctx->tdata->lock);
if (destroy_tdata) {
prof_tdata_destroy(tsd, tdata, false);
}
if (destroy_tctx) {
idalloctm(tsd_tsdn(tsd), tctx, NULL, NULL, true, true);
}