[openib-general] kdapl locking problem

[Itamar Rabenstein]

Hi Hal,
I am trying to understand what is going here and i still dont see how this
happan .

This prints are only set in UP mode .(is this your system UP?)
the code is (function: dapl_evd_connection_callback):
spin_lock_irqsave(&ep->common.lock, ep->common.flags);
case on the event type
disconnect:  dapl_ib_disconnect_clean(ep, TRUE);
spin_unlock_irqrestore(&ep->common.lock, ep->common.flags);

from some reason in the middle between the lock and the unlock there is a
call to consumer 
function (dat_ep_disconnetc) that try to disconnect the same ep and the lock
fail.

the evd_cb function is either an interupt from the CM so i dont see how the
consumer can call 
dat_ib_disconnect in the middle 
or the user called twice to dat_ib_disconnect on the same ep and youe kernel
give preemption

i dont understand both (;-)

can you try to run it with some debug?
at least ot know who called to dapl_evd_connection_callback ?

 Itamar 


> -----Original Message-----
> From: Hal Rosenstock [mailto:halr at voltaire.com]
> Sent: Tuesday, June 14, 2005 8:37 PM
> To: James Lentini
> Cc: openib-general at openib.org
> Subject: [openib-general] kdapl locking problem
> 
> 
> Hi,
> 
> When running in loopback mode (client and server on same 
> machine (x86)):
> kdapltest -T T -s <IP addr> -D mthca0a -d -t 2 -w 8 -i 20 
> client SR server SR
> I see the following locking problem:
> 
> Jun 14 13:30:08 localhost kernel: 
> drivers/infiniband/ulp/dat-provider/dapl_ep.c:1111: 
> spin_lock(drivers/infiniband/ulp/dat-provider/dapl_ep.c:c44b1c
> 18) already locked by 
> drivers/infiniband/ulp/dat-provider/dapl_evd.c/756
> Jun 14 13:30:08 localhost kernel: 
> drivers/infiniband/ulp/dat-provider/dapl_evd.c:797: 
> spin_unlock(drivers/infiniband/ulp/dat-provider/dapl_ep.c:c44b
> 1c18) not locked
> 
> -- Hal
> 
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