Tim Chubb

BUG: freeing already freed pointer (0x7f19a3edec68), called from tls: tls_init.c with random core dumps

11

### Description Im getting frequent log entries like this: `CRITICAL: [core/mem/q_malloc.c:519]: qm_free(): BUG: freeing already freed pointer (0x7f19a3edec68), called from tls: tls_init.c: ser_free(323), first free tls: tls_init.c: ser_free(323) - ignoring`...

https://github.com/grafana/loki/issues/1839 duration strings now no longer accept just 0, but need to be 0s