| Jordan_U | There is a user in #ubuntu who appears to have a defunct process whose parent is init, am I correct in thinking that shouldn't be possible? Am I correct in having them submit a bug report against upstart? | 07:51 |
|---|---|---|
| Jordan_U | Output of "ps aux" showing that the process is defunct: http://paste.ubuntu.com/1349958/ output of "pstree" showing that it's owned by init, http://paste.ubuntu.com/1349935/ . | 07:52 |
| chris| | Jordan_U, no, it is entirely possible to have a defunct process under init | 07:58 |
| chris| | Jordan_U, I imagine you assume that all processes under init are controlled by upstart, but that is not the case | 08:00 |
| Jordan_U | I did assume that, apparently incorrectly :) | 08:00 |
| Jordan_U | Is PID 1 not upstart? | 08:01 |
| chris| | Jordan_U, imagine, for example, you run a process from the shell that daemonizes into the background, thus detaching from the shell process. Because the parent process is gone, init will then "adopt" the process. | 08:03 |
| chris| | Jordan_U, that does not mean however that the same rules apply for those processes that would apply for processes run by upstart | 08:04 |
| Jordan_U | chris|: Is PID 1 not upstart? | 08:05 |
| chris| | Jordan_U, pid 1 is upstart | 08:06 |
| Jordan_U | chris|: Is it not the responsibility of PID 1 to reap its children? Are there times when a child cannot be reaped? Am I misunderstanding something fundamental? | 08:10 |
| SpamapS | wow | 08:28 |
| SpamapS | I googled for 'upstart reap defunct' and your bug came up Jordan_U | 08:28 |
| SpamapS | "33 minutes ago" | 08:28 |
| SpamapS | Jordan_U: its possible, perhaps even likely, that the defunct process is stuck in a syscall | 08:29 |
| SpamapS | Jordan_U: BTW I would expect upstart to reap zombies yes | 08:38 |
| SpamapS | Jordan_U: finding where it actually does so in the code, however, is eluding me | 08:38 |
| * SpamapS heads to bed | 08:38 | |
| Jordan_U | SpamapS: I though that would leave it in a "D" state rather than a "Z" state (as shown in ps). | 08:39 |
| SpamapS | Jordan_U: agreed, Z should just mean that it has exitted, and init should be calling waitpid on it to let it die | 15:46 |
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