Re: [uml-devel] 2.6.9-bb3 on 2.6.9 host problem - triggering a hostbug?

[Bodo Stroesser]

Blaisorblade wrote:
> On Monday 29 November 2004 23:15, Blaisorblade wrote:
>
> However, I've now discovered that it only happens when CONFIG_STATIC_LINK is 
> enabled - that makes the kernel die. The interesting thing is that it becomes 
> unkillable
Have found the reason for the task to become unkillable, i.e. state 'D'.

There is a bug in 2.6.9 and up in fs/exec.c

If the kernel does coredump_wait(), it tries to kill all other threads, that are
running on the same mm. Therefore it calls "force_sig_specific(SIGKILL, p)".
But if one of the threads is on a ptrace-stop, SIGKILL has no effect.
The killing thread will wait forever in "D".

Bodo
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