XCSBuilderService Connection die, something progress was block?

I have 80+ bots on Xcode Server. We use reset API to create our bots, and active once the integration of all bots.

Later the Xcode Server was die away.

when I restart XcodeServer (which had 2 integration tasks on the CouchDB), the 2 task was active and run success. and later XcodeServer entry died away again.

I was collect some logs from XCSBuilderService.

Dispatch Thread Soft Limit: 64 reached in 2156 of 2156 samples -- too many dispatch threads blocked in synchronous operations

Call graph:
    2156 Thread_680651   DispatchQueue_1: com.apple.main-thread  (serial)
    + 2156 start  (in dyld) + 520  [0x102ca508c]
    +   2156 main  (in XCSBuilderService) + 92  [0x102b3c15c]
    +     2156 -[NSXPCListener resume]  (in Foundation) + 344  [0x18d969eac]
    +       2156 xpc_main  (in libxpc.dylib) + 108  [0x18c6d71d0]
    +         2156 _xpc_objc_main  (in libxpc.dylib) + 876  [0x18c6d78b4]
    +           2156 -[NSRunLoop(NSRunLoop) run]  (in Foundation) + 92  [0x18d9d8464]
    +             2156 -[NSRunLoop(NSRunLoop) runMode:beforeDate:]  (in Foundation) + 236  [0x18d9480c0]
    +               2156 CFRunLoopRunSpecific  (in CoreFoundation) + 600  [0x18ca62a84]
    +                 2156 __CFRunLoopRun  (in CoreFoundation) + 1180  [0x18ca636c0]
    +                   2156 __CFRunLoopServiceMachPort  (in CoreFoundation) + 372  [0x18ca65210]
    +                     2156 mach_msg  (in libsystem_kernel.dylib) + 76  [0x18c95ad20]
    +                       2156 mach_msg_trap  (in libsystem_kernel.dylib) + 8  [0x18c95a8b0]
    2156 Thread_680717: com.apple.NSURLConnectionLoader
    + 2156 thread_start  (in libsystem_pthread.dylib) + 8  [0x18c99308c]
    +   2156 _pthread_start  (in libsystem_pthread.dylib) + 148  [0x18c99826c]
    +     2156 __NSThread__start__  (in Foundation) + 808  [0x18d9405cc]
    +       2156 ???  (in CFNetwork)  load address 0x1915ef000 + 0x26b638  [0x19185a638]
    +         2156 CFRunLoopRunSpecific  (in CoreFoundation) + 600  [0x18ca62a84]
    +           2156 __CFRunLoopRun  (in CoreFoundation) + 1180  [0x18ca636c0]
    +             2156 __CFRunLoopServiceMachPort  (in CoreFoundation) + 372  [0x18ca65210]
    +               2156 mach_msg  (in libsystem_kernel.dylib) + 76  [0x18c95ad20]
    +                 2156 mach_msg_trap  (in libsystem_kernel.dylib) + 8  [0x18c95a8b0]
    2156 Thread_954093   DispatchQueue_46513: -[DVTSourceControlWorkspaceBlueprint init] (QOS: UNSPECIFIED)  (concurrent)

More file:

By the way, if apple did not support it. can you open Source this code of XCS's all files?

Thanks