general protection fault

[Bernd Schubert <bschubert@xxxxxxxxx>]

Hi,

I'm trying to debug an infiniband problem and so I add several printk's to
the code to trace it. Now I have the problem that those printk's cause a
general protection fault. 

I only need to know the address of qp->s_cur_sge->sge.vaddr.

Any idea how a printk could cause this error and how to workaround it?


Thanks in advance for any help,
Bernd


static int ipath_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
                           struct ib_send_wr **bad_wr)
{
        struct ipath_qp *qp = to_iqp(ibqp);
        int err = 0;

        /* Check that state is OK to post send. */
        if (!(ib_ipath_state_ops[qp->state] & IPATH_POST_SEND_OK)) {
                *bad_wr = wr;
                err = -EINVAL;
                goto bail;
        }

        printk ("%s():%d: addr = %p\n", __func__, __LINE__, (u32 *)
qp->s_cur_sge->sge.vaddr);


Starting Infiniband initialization: [   96.731281] general protection fault:
0000 [1] SMP

Entering kdb (current=0xffff81007c17b140, pid 2421) on processor 0 Oops:
<NULL>
due to oops @ 0xffffffff88073c70
     r15 = 0xffff81007ddd5cf8      r14 = 0xffff810078223b50
     r13 = 0x0000000000000000      r12 = 0xffff810119c3b238
     rbp = 0xffff810078223b30      rbx = 0xffff81007d674bd0
     r11 = 0x0000000000000006      r10 = 0x0000000000000000
      r9 = 0x0000000000000000       r8 = 0x0000000000000000
     rax = 0x5a5a5a5a5a5a5a5a      rcx = 0x0000000000000001
     rdx = 0x00000000000000fa      rsi = 0xffffffff8807aac0
     rdi = 0xffffffff88080eab orig_rax = 0xffffffffffffffff
     rip = 0xffffffff88073c70       cs = 0x0000000000000010
  eflags = 0x0000000000010002      rsp = 0xffff810078223b00
      ss = 0x0000000000000018 &regs = 0xffff810078223a68
[0]kdb> bt
Stack traceback for pid 2421
0xffff81007c17b140     2421       19  1    0   R  0xffff81007c17b400 *ipoib
rsp                rip                Function (args)
0xffff810078223ae8 0xffffffff88073c70 [ib_ipath]ipath_post_send+0x53
0xffff810078223b38 0xffffffff880efa4b [ib_mad]ib_send_mad+0x10c



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