threads/119920: fork broken in libpthread

[Julian Elischer]

Landon Fuller wrote:
> 
> On Jan 31, 2008, at 11:25, Julian Elischer wrote:
> 
>> Landon Fuller wrote:
>>> On Jan 31, 2008, at 10:44, Julian Elischer wrote:
>>>> the releng 6 and releng 7 versions of this patch are at:
>>>>
>>>> http://www.freebsd.org/~julian/kse-6.diff
>>>>
>>>> and
>>>>
>>>> http://www.freebsd.org/~julian/kse-7.diff
>>>>
>>>>
>>>> but the one for 7 is just speculative.
>>>>
>>>> I don't have a 7.x system to test.
>>>>
>>>>
>>>> Landon, what is your test case?
>>>>
>>> Inlined below. On our 8-core 6.3 system without this patch, the 
>>> fork() threads wedge and spin in <2 minutes. With the patch, works as 
>>> expected.
>>
>> when you say "wedge and spin"  what do you see in top?
>>
>> which is it , wedge, or spin?
> 
> The children processes spin (in either sigprocmask() or 
> _lockuser_reinit()), and the parent process thread wedges on waitpid().

so if the children show up in top at all (usually they are already 
exited by the time top looks) then the problem has been hit. right?