As an addendum to crash commit 5fe78861ea1589084f6a2956a6ff63677c9269e1,
this patch for the ppc64 "bt" command prevents an invalid error message
from being displayed when an active non-panic task is interrupted while
running in user space. Without the patch, the command correctly indicates
"Task is running in user space", dumps the user-space exception frame, but
then prints the invalid error message "bt: invalid kernel virtual address:
ffffffffffffff90 type: Regs NIP value".
The patch has been ACK'd offline by Hari Bathini.
Thanks,
Dave
diff --git a/ppc64.c b/ppc64.c
index 03fecd3..8badcde 100644
--- a/ppc64.c
+++ b/ppc64.c
@@ -2254,6 +2254,7 @@ ppc64_vmcore_stack_frame(struct bt_info *bt_in, ulong *nip, ulong *ksp)
{
struct ppc64_pt_regs *pt_regs;
unsigned long unip;
+ int in_user_space = FALSE;
pt_regs = (struct ppc64_pt_regs *)bt_in->machdep;
if (!pt_regs || !pt_regs->gpr[1]) {
@@ -2272,10 +2273,11 @@ ppc64_vmcore_stack_frame(struct bt_info *bt_in, ulong *nip, ulong *ksp)
FAULT_ON_ERROR);
*nip = unip;
} else {
- if (IN_TASK_VMA(bt_in->task, *ksp))
+ if (IN_TASK_VMA(bt_in->task, *ksp)) {
fprintf(fp, "%0lx: Task is running in user space\n",
bt_in->task);
- else
+ in_user_space = TRUE;
+ } else
fprintf(fp, "%0lx: Invalid Stack Pointer %0lx\n",
bt_in->task, *ksp);
*nip = pt_regs->nip;
@@ -2289,6 +2291,8 @@ ppc64_vmcore_stack_frame(struct bt_info *bt_in, ulong *nip, ulong *ksp)
* Print the collected regs for the active task
*/
ppc64_print_regs(pt_regs);
+ if (in_user_space)
+ return TRUE;
if (!IS_KVADDR(*ksp))
return FALSE;
--
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