go - 运行时/ cgo：pthread_create失败：资源暂时不可用

我目前拥有此功能，该功能通过ffmpeg传递多个youtubedl命令，然后将ffmpeg的输出传递给HTTP客户端。

func pipeThruFfmpegToMp4(vi *VideoInfo, rw web.ResponseWriter) error {
    var ffmpeg *exec.Cmd
    ffmpeg = exec.Command(
        "ffmpeg",
        "-i", "-",
        "-i", "pipe:3",
        "-c:v", "copy", "-c:a", "copy",
        "-preset", "veryfast",
        "-metadata", fmt.Sprintf(`title=%s`, vi.GetTitle()),
        "-movflags", "frag_keyframe+empty_moov",
        "-f", "mp4",
        "-")


    youtubevideo := exec.Command(YoutubeDLPath, "-c", "-f", fmt.Sprintf("%s/bestvideo[ext=mp4]/bestvideo/best", vi.GetFormat()), "--no-cache-dir", "--restrict-filenames", "--hls-prefer-native", "-o", "-", fmt.Sprintf("%s", vi.GetVideoUrl()))
    fmt.Println(youtubevideo)

    youtube := exec.Command(YoutubeDLPath, "-c", "-f", "bestaudio[ext=m4a]/bestaudio/best", "--no-cache-dir", "--restrict-filenames", "--hls-prefer-native", "-o", "-", fmt.Sprintf("%s", vi.GetVideoUrl()))
    fmt.Println(youtube)

    var ytvbuf, ytbuf, ffbuf bytes.Buffer
    youtubevideo.Stderr = &ytvbuf
    youtube.Stderr = &ytbuf
    ffmpeg.Stderr = &ffbuf

    video, err := youtubevideo.StdoutPipe()
    if err != nil {
        log.Printf("pipeThruFfmpegToMp4: %v\n", err)
        return err
    }

    pipe3, err := youtube.StdoutPipe()
    if err != nil {
        log.Printf("pipeThruFfmpegToMp4: %v\n", err)
        return err
    }

    ffmpeg.Stdin = video
    ffmpeg.ExtraFiles = []*os.File{pipe3.(*os.File)}
    ffmpeg.Stdout = rw

    // Headers sent, no turning back now
    rw.Header().Set("Content-Type", "video/mp4")
    rw.Header().Set("Content-Disposition", fmt.Sprintf("attachment;filename=\"%s.mp4\"", vi.GetSlug()))
    rw.Flush()

    ffmpeg.Start()
    youtubevideo.Start()
    youtube.Start()
    ffmpeg.Wait()
    youtubevideo.Wait()
    youtube.Wait()

    // check ytvbuf, ytbuf, ffbuf for stderr errors

    if ffbuf.Len() != 0 {
        rollbar.Error(rollbar.ERR, err, &rollbar.Field{"stderr", ffbuf.String()})
        log.Printf("pipeThruFfmpegToMp4: %v\n", ffbuf.String())
    }
    if ytvbuf.Len() != 0 {
        rollbar.Error(rollbar.ERR, err, &rollbar.Field{"stderr", ytvbuf.String()})
        log.Printf("pipeThruYouTubevDLToMp4: %v\n", ytvbuf.String())
    }
    if ytbuf.Len() != 0 {
        rollbar.Error(rollbar.ERR, err, &rollbar.Field{"stderr", ytbuf.String()})
        log.Printf("pipeThruYouTubeDLToMp4: %v\n", ytbuf.String())
    }

    return nil
}

问题是一切运行正常，但过一会儿ram开始在服务器上填满，直到出现错误提示 runtime/cgo: pthread_create failed: Resource temporarily unavailable

我不确定这是否是内存泄漏，或者youtube-dl的任一实例关闭不正确，或者ffmpeg关闭不正确，并且随着程序运行的增加而消耗越来越多的ram，直到程序因此错误而崩溃

runtime/cgo: pthread_create failed: Resource temporarily unavailable
SIGABRT: abort
PC=0x7f083501fe97 m=128 sigcode=18446744073709551610

goroutine 0 [idle]:
runtime: unknown pc 0x7f083501fe97
stack: frame={sp:0x7f05ff7fd7d0, fp:0x0} stack=[0x7f05feffe288,0x7f05ff7fde88)
00007f05ff7fd6d0:  00007f05ff7fd700  0000ffff00001fa0
00007f05ff7fd6e0:  00007f05ff7fdbe0  00007f05f8000da0
00007f05ff7fd6f0:  0000000000000000  000000000093032c
00007f05ff7fd700:  0000000000000000  00007f0835600ec3
00007f05ff7fd710:  0000000000000005  0000000000000000
00007f05ff7fd720:  000000c0000ce120  00007f0834ff1ce0
00007f05ff7fd730:  00007f05ff7fdaf0  00007f083560870a
00007f05ff7fd740:  0000000000000000  0000000000000000
00007f05ff7fd750:  0000000000000000  00007f05ff7fdbe0
00007f05ff7fd760:  2525252525252525  2525252525252525
00007f05ff7fd770:  000000ffffffffff  0000000000000000
00007f05ff7fd780:  000000ffffffffff  0000000000000000
00007f05ff7fd790:  000000c00010d1a0  000000c000953740
00007f05ff7fd7a0:  000000c0000ce120  000000c000cf2300
00007f05ff7fd7b0:  000000c00010d260  000000c001f4e180
00007f05ff7fd7c0:  000000c001f4e000  000000c00169f680
00007f05ff7fd7d0: <0000000000000000  000000c001f34180
00007f05ff7fd7e0:  6e75720000000000  6f67632f656d6974
00007f05ff7fd7f0:  0000000000000000  0000000000000000
00007f05ff7fd800:  000000c000cf2300  000000c00010d260
00007f05ff7fd810:  000000c001f4e180  000000c001f4e000
00007f05ff7fd820:  000000c00169f680  000000c00169f500
00007f05ff7fd830:  000000c001f34180  000000c001f34000
00007f05ff7fd840:  000000c000c92780  000000c001ec2600
00007f05ff7fd850:  fffffffe7fffffff  ffffffffffffffff
00007f05ff7fd860:  ffffffffffffffff  ffffffffffffffff
00007f05ff7fd870:  ffffffffffffffff  ffffffffffffffff
00007f05ff7fd880:  ffffffffffffffff  ffffffffffffffff
00007f05ff7fd890:  ffffffffffffffff  ffffffffffffffff
00007f05ff7fd8a0:  ffffffffffffffff  ffffffffffffffff
00007f05ff7fd8b0:  ffffffffffffffff  ffffffffffffffff
00007f05ff7fd8c0:  ffffffffffffffff  ffffffffffffffff
runtime: unknown pc 0x7f083501fe97
stack: frame={sp:0x7f05ff7fd7d0, fp:0x0} stack=[0x7f05feffe288,0x7f05ff7fde88)
00007f05ff7fd6d0:  00007f05ff7fd700  0000ffff00001fa0
00007f05ff7fd6e0:  00007f05ff7fdbe0  00007f05f8000da0
00007f05ff7fd6f0:  0000000000000000  000000000093032c
00007f05ff7fd700:  0000000000000000  00007f0835600ec3
00007f05ff7fd710:  0000000000000005  0000000000000000

我也尝试过构建二进制文件，CGO_ENABLED=0即使我什至没有，import "c"但最终也会出错

runtime: failed to create new OS thread (have 21 already; errno=11)
runtime: may need to increase max user processes (ulimit -u)
fatal error: newosproc

我的限制已经很宽泛了，也许这可能是个问题？还是我必须增加管道尺寸？

$ ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 192907
max locked memory       (kbytes, -l) 16384
max memory size         (kbytes, -m) unlimited
open files                      (-n) 100000
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 65536
cpu time               (seconds, -t) unlimited
max user processes              (-u) 63883
virtual memory          (kbytes, -v) unlimited

无论哪种方式，我都对在此方面获得的所有帮助表示赞赏。这是整个程序的链接，这是golang-nuts论坛中有关此问题的主题