[ewg] Crash in iw_cxgb3 (Chelsio) in OFED 1.4.1

[Viral Mehta]

There is a comment above the code...
"
/*               * Now rptr is the index for the (last) cqe that was
                * in-flight at the time the HW rearmed the CQ.  We
                * spin until that CQE is valid.
                */
"

It is waiting for CQE to be valid which was in-flight when CQ was armed. 
And beneath that printk says, RNIC is stalled and which looks the case 
here..
Anyway, Chelsio people will have the solution. But, I have a point if 
printk is valid, it should be shifted above BUG_ON(1) to print one more 
appropriate message.

Thanks,
Viral Mehta,
Embedded Software Engineer,
Tel. No. 91 79 26563705, Ext. 423
www.einfochips.com <http://www.einfochips.com>


pandit ib wrote:
> We are seeing a kernel panic in iw_cxgb3 in OFED 1.4.1 (attached screen shot)
>
> The problem seems to be happening at....
>
> ofa_kernel-1.4.1/drivers/infiniband/hw/cxgb3/cxio_hal.c:112
>
>
>  109                 while (!CQ_VLD_ENTRY(rptr, cq->size_log2, cqe)) {
>  110                         udelay(1);
>  111                         if (i++ > 1000000) {
>  112               -------->        BUG_ON(1);
>  113                                 printk(KERN_ERR "%s: stalled rnic\n",
>  114                                        rdev_p->dev_name);
>  115                                 return -EIO;
>  116                         }
>  117                 }
>
>
> Any ideas?
> Is it a known issue and if so is there a fix or workaround?
>
>
> Thanks,
> Ranjit
>
>
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