Crash in curl_multi_perform add_next_timeout

[Gangadhar Hariharan via curl-library]

Hi,

i observe crash in curl_multi_perform add_next_timeout

​Similar to

https://curl.haxx.se/mail/lib-2016-01/0102.html
https://curl.haxx.se/mail/lib-2017-10/0011.html

i have 2 threads which share the multi-handler
In the main thread, i have curl_multi_add_handle(mh, curl)
In a pthread, i have curl_multi_perform(mh, &still_running)

I protect both functions by a binary semaphore. semaphore is initted to 1

main thread():
.
.
sem_wait(&mh_sem);
curl_multi_add_handle(mh, curl)
sem_post(&mh_sem)
.
.

pthread:

while (1) {
    do {
        sem_wait(&mh_sem);
        mret = curl_multi_perform(mh, &still_running);
        sem_post(&mh_sem)
    }while (still_running && (mret == CURLM_CALL_MULTI_PERFORM));
}

Something i am doing wrong here that the crash still happens?

Thanks,
-gangadhar

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