Hi Michal.
On 9/17/26 7:45 PM, Shrikanth Hegde wrote:
Hi Michal,
Give it a try.
I am suspecting both lockup, stack corruptions are secondary symptoms here.
While recreate, I have different type of traces.
Yes, it does work for the crash I see.
Thanks. Give me sometime to see further on that. Didn't get any time today.
This is going to be the fix IMO. It passes all the recreates i have as of now.
(Please ignore the whitespace mangling if any)
Let me write changelog and send it across.
---
diff --git a/arch/powerpc/kernel/trace/ftrace_entry.S
b/arch/powerpc/kernel/trace/ftrace_entry.S
index 6599fe3c6234..54c8727b48cd 100644
--- a/arch/powerpc/kernel/trace/ftrace_entry.S
+++ b/arch/powerpc/kernel/trace/ftrace_entry.S
@@ -220,7 +220,9 @@
/* Restore gprs */
.if \allregs == 1
- REST_GPRS(2, 31, r1)
+ REST_GPRS(2, 12, r1)
+ /* Do not restore a stale PACA pointer if the task migrated */
+ REST_GPRS(14, 31, r1)
.else
REST_GPRS(3, 10, r1)
#if defined(CONFIG_LIVEPATCH_64) || defined(CONFIG_PPC_FTRACE_OUT_OF_LINE)
