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RED-31295 - redis: avoid race between dlopen and thread creation

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It seeems that since I added the creation of the jemalloc thread redis
sometimes fails to start with the following error:

Inconsistency detected by ld.so: dl-tls.c: 493: _dl_allocate_tls_init: Assertion `listp->slotinfo[cnt].gen <= GL(dl_tls_generation)' failed!

This seems to be due to a race bug in ld.so, in which TLS creation on the
thread, collide with dlopen.

Move the creation of BIO and jemalloc threads to after modules are loaded.

plus small bugfix when trying to disable the jemalloc thread at runtime
This commit is contained in:
Oran Agra
2019-09-09 14:35:06 +03:00
parent 09f99c2a92
commit 2e19b94113
2 changed files with 12 additions and 4 deletions
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6
src/zmalloc.c
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@ -332,10 +332,8 @@ int zmalloc_get_allocator_info(size_t *allocated,
void set_jemalloc_bg_thread(int enable) {
/* let jemalloc do purging asynchronously, required when there's no traffic
* after flushdb */
if (enable) {
char val = 1;
je_mallctl("background_thread", NULL, 0, &val, 1);
}
char val = !!enable;
je_mallctl("background_thread", NULL, 0, &val, 1);
}
int jemalloc_purge() {