Re: Fw: 2.5.61 oops running SDET

[Manfred Spraul <manfred@colorfullife.com>]

Linus Torvalds wrote:

>On Sun, 16 Feb 2003, Manfred Spraul wrote:
>  
>
>>AFAICS both exec and exit rely on write_lock_irq(tasklist_lock) for 
>>synchronization of changes to tsk->sig{,hand}.
>>    
>>
>
>Yeah, as I sent out in my last email this does seem to be true right now, 
>but it's really not correct. It's disgusting that we use such a 
>fundamental global lock to protect something so trivially local to the one 
>process, where the local per-process lock really should be more than 
>enough.
>
The difference between the tasklist_lock and task_lock is that task_lock 
is not an interrupt lock.
Think about signal delivery during exec.

Do you want to replace tasklist_lock with task_lock in exit_sighand() 
and during exec, or do you want to add task_lock to tasklist_lock?

Hmm.
Someone removed the read_lock(tasklist_lock) around 
send_specific_sig_info() - which lock synchronizes exec and signal delivery?

--
    Manfred