[Xen-devel] [PATCH] xen/arm: Don't dump stack when the VCPU is offline

[Julien Grall <julien.grall@xxxxxxxxxx>]

When a VCPU is not yet online, the registers contain garbagge. This will result
to call randomly BUG() in show_guest_stack.

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
---
 xen/arch/arm/traps.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 02c7e28..36fd411 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -614,6 +614,12 @@ static void show_guest_stack(struct vcpu *v, struct 
cpu_user_regs *regs)
     void *mapped;
     unsigned long *stack, addr;
 
+    if ( test_bit(_VPF_down, &v->pause_flags) )
+    {
+        printk("No stack trace, VCPU offline\n");
+        return;
+    }
+
     switch ( regs->cpsr & PSR_MODE_MASK )
     {
     case PSR_MODE_USR:
-- 
1.7.10.4


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