什么是m =表示Go程序何时收到SIGABRT

My Go program has received a SIGABRT error. Go dumped the error followed by go-routine dump

runtime/cgo: pthread_create failed: Resource temporarily unavailable
SIGABRT: abort
PC=0x7f9b19a2a1f7 m=2

What does the value "m=2" indicate. Is it the return value of the pthread_create call?