One stupid but useful way to narrow this down would be to reproduce
the crash with the following patch applied on top...
Index: linux-kernel/infiniband/ulp/srp/ib_srp.c
===================================================================
--- linux-kernel.orig/infiniband/ulp/srp/ib_srp.c 2006-04-12
12:24:37.398566000 -0700
+++ linux-kernel/infiniband/ulp/srp/ib_srp.c 2006-04-13 13:57:45.793412000
-0700
@@ -428,7 +428,12 @@
target->state = SRP_TARGET_CONNECTING;
spin_unlock_irq(target->scsi_host->host_lock);
+ printk(KERN_ERR "%s/%d: about to disconnect...\n", __func__, __LINE__);
+
srp_disconnect_target(target);
+
+ printk(KERN_ERR "%s/%d: disconnected...\n", __func__, __LINE__);
+
/*
* Now get a new local CM ID so that we avoid confusing the
* target in case things are really fouled up.
@@ -442,23 +447,33 @@
ib_destroy_cm_id(target->cm_id);
target->cm_id = new_cm_id;
+ printk(KERN_ERR "%s/%d: got a new CM ID...\n", __func__, __LINE__);
+
qp_attr.qp_state = IB_QPS_RESET;
ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
if (ret)
goto err;
+ printk(KERN_ERR "%s/%d: Reset QP...\n", __func__, __LINE__);
+
ret = srp_init_qp(target, target->qp);
if (ret)
goto err;
+ printk(KERN_ERR "%s/%d: Init QP...\n", __func__, __LINE__);
+
while (ib_poll_cq(target->cq, 1, &wc) > 0)
; /* nothing */
+ printk(KERN_ERR "%s/%d: cleared CQ...\n", __func__, __LINE__);
+
list_for_each_entry(req, &target->req_queue, list) {
req->scmnd->result = DID_RESET << 16;
req->scmnd->scsi_done(req->scmnd);
}
+ printk(KERN_ERR "%s/%d: cleared request queue...\n", __func__,
__LINE__);
+
target->rx_head = 0;
target->tx_head = 0;
target->tx_tail = 0;
@@ -468,10 +483,14 @@
target->req_ring[SRP_SQ_SIZE - 1].next = -1;
INIT_LIST_HEAD(&target->req_queue);
+ printk(KERN_ERR "%s/%d: reinited req ring...\n", __func__, __LINE__);
+
ret = srp_connect_target(target);
if (ret)
goto err;
+ printk(KERN_ERR "%s/%d: connected target...\n", __func__, __LINE__);
+
spin_lock_irq(target->scsi_host->host_lock);
if (target->state == SRP_TARGET_CONNECTING) {
ret = 0;
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