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SubjectRe: OOps in exec_usermodehelper
Petr Vandrovec wrote:
>
> Hi,
> I have one small problem with 2.4.0-test11 and exec_usermodehelper.
> When vmware modules shutdown (specifically vmnet-netifup), kernel tries
> to load some module through call_usermodehelper, but unfortunately
> from task which has current->files == NULL.
>
> So it prints message:
>
> waitpid(19457) failed, -512
>
> and then it oopses in
>
> for (i = 0; i < current->files->max_fds; i++) {
> if (current->files->fd[i]) close(i);
> }
>
> (In log, there is first waitpid, and then oopses from current->files == NULL,
> which I do not quite understand).
>
> Should I look into this more deeply, or is correct fix just add
>
> if (current->files) {
> for (i = 0; ..... ) ...
> }
>
> into exec_usermodehelper?

No. Then it just blows up somewhere else.

The root cause here is that we're starting a kernel thread
from within a half-exitted parent. I'll be coding a fix
later today.
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