***SPAM*** Re: [ofa-general] ib_reg_phys_mr( ) results in crash

[neutron]

I'm using Mellanox HCA 'mthca0' type: MT25208, kernel version:
2.6.18-53.1.14.el5,  ofed 1.3.1.

The failed function call is like:

{

ctx->send_buf = dma_alloc_coherent(ctx->ib_dev->dma_device, MAX_SIZE,
                &dma_addr, GFP_KERNEL);

ctx->phy_buf[0].addr = dma_addr;
ctx->phy_buf[0].size = MAX_SIZE;
ctx->iovstart = (u64) ctx->send_buf;

printk("pd=%p, phy_buf[0].addr=%p,size=%d, iovstart=%llx\n",
       ctx->pd, ctx->phy_buf[0].addr, ctx->phy_buf[0].size, ctx->iovstart );

send_mr = ib_reg_phys_mr( ctx->pd, &ctx->phy_buf[0], 1,
                        IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_READ
                         | IB_ACCESS_LOCAL_WRITE, &(ctx->iovstart));
}

The phy_buf[0] is a "ib_phys_buf" corresponding to "ctx->send_buf".

Below is /var/log/messages output around the crash.
----------------
Feb 19 12:50:22 wci30 kernel:  pd=ffff8101da3ddce0,
phy_buf[0].addr=00000001bbe4b000,size=1024, iovstart=ffff8101bbe4b000

Feb 19 12:50:22 wci30 kernel: Unable to handle kernel NULL pointer
dereference at 0000000000000000
 RIP:
Feb 19 12:50:22 wci30 kernel:  [<0000000000000000>] _stext+0x7ffff000/0x1000
Feb 19 12:50:22 wci30 kernel: PGD 1c06d5067 PUD 1c9dcd067 PMD 0
Feb 19 12:50:22 wci30 kernel: Oops: 0010 [1] SMP
Feb 19 12:50:22 wci30 kernel: last sysfs file: /module/libata/version
Feb 19 12:50:22 wci30 kernel: CPU 0
Feb 19 12:54:05 wci30 syslogd 1.4.1: restart.
Feb 19 12:54:05 wci30 kernel: klogd 1.4.1, log source = /proc/kmsg started.
Feb 19 12:54:05 wci30 kernel: Linux version 2.6.18-53.1.14.el5
(brewbuilder at hs20-bc2-3.build.redha
t.com) (gcc version 4.1.2 20070626 (Red Hat 4.1.2-14)) #1 SMP Tue Feb
19 07:18:46 EST 2008
Feb 19 12:54:05 wci30 kernel: Command line: ro root=LABEL=/ rhgb quiet

====================
It's strange that the kernel doesn't print out the function call stack
before crashing.

Any hints?  Thanks a lot!

On Wed, Feb 18, 2009 at 7:40 PM, Roland Dreier <rdreier at cisco.com> wrote:
>  > Before calling ib_reg_phys_mr,  printk() shows that all its arguments
>  > are valid.  But the system always crashes immediately after entering
>  > the function ib_reg_phys_mr( ).    Any possible reasons ?  Thanks!!
>
> What do you mean by "immediately after entering ib_reg_phys_mr()"?  Do
> you get an oops message?  If so that would be very important info for
> debugging this.
>
> - R.
>