Golang 源码分析 - coredump
2017-05-23
/usr/local/go/src/runtime/runtime1.go:387
...
setTraceback(gogetenv("GOTRACEBACK"))
...
//go:linkname setTraceback runtime/debug.SetTraceback
func setTraceback(level string) {
var t uint32
switch level {
case "none":
t = 0
case "single", "":
t = 1 << tracebackShift
case "all":
t = 1<<tracebackShift | tracebackAll
case "system":
t = 2<<tracebackShift | tracebackAll
case "crash":
t = 2<<tracebackShift | tracebackAll | tracebackCrash
default:
t = uint32(atoi(level))<<tracebackShift | tracebackAll
}
// when C owns the process, simply exit'ing the process on fatal errors
// and panics is surprising. Be louder and abort instead.
if islibrary || isarchive {
t |= tracebackCrash
}
t |= traceback_env
atomic.Store(&traceback_cache, t)
}
// gotraceback returns the current traceback settings.
//
// If level is 0, suppress all tracebacks.
// If level is 1, show tracebacks, but exclude runtime frames.
// If level is 2, show tracebacks including runtime frames.
// If all is set, print all goroutine stacks. Otherwise, print just the current goroutine.
// If crash is set, crash (core dump, etc) after tracebacking.
//
//go:nosplit
func gotraceback() (level int32, all, crash bool) {
_g_ := getg()
all = _g_.m.throwing > 0
if _g_.m.traceback != 0 {
level = int32(_g_.m.traceback)
return
}
t := atomic.Load(&traceback_cache)
crash = t&tracebackCrash != 0
all = all || t&tracebackAll != 0
level = int32(t >> tracebackShift)
return
}
- 增加环境变量 GOTRACEBACK=crash
- 修改 core 文件保存的路径
- 默认生成的 core 文件保存在可执行文件所在的目录下，文件名就为 core。
- 通过修改 /proc/sys/kernel/core_uses_pid 文件可以让生成 core 文件名是否自动加上 pid 号。
- 例如 echo 1 > /proc/sys/kernel/core_uses_pid ，生成的 core 文件名将会变成 core.pid，其中 pid 表示该进程的 PID。
- 还可以通过修改 /proc/sys/kernel/core_pattern 来控制生成 core 文件保存的位置以及文件名格式。例如可以用 echo “/tmp/corefile-%e-%p-%t” > /proc/sys/kernel/core_pattern 设置生成的 core 文件保存在 “/tmp/corefile” 目录下，文件名格式为 “core-命令名-pid-时间戳”。这里有更多详细的说明！
