On 2025/9/11 下午9:44, Miroslav Benes wrote:
Hi,
On Tue, 9 Sep 2025, Tiezhu Yang wrote:
When testing the kernel live patching with "modprobe livepatch-sample",
there is a timeout over 15 seconds from "starting patching transition"
to "patching complete", dmesg shows "unreliable stack" for user tasks
in debug mode. When executing "rmmod livepatch-sample", there exists
the similar issue.
Like x86, arch_stack_walk_reliable() should return 0 for user tasks.
It is necessary to set regs->csr_prmd as task->thread.csr_prmd first,
then use user_mode() to check whether the task is in userspace.
it is a nice optimization for sure, but "unreliable stack" messages point
to a fact that the unwinding of these tasks is probably suboptimal and
could be improved, no?
Yes, makes sense, I will fix "unreliable stack" in the next version.
It would also be nice to include these messages (not for all tasks) to the
commit message.
OK, will do it.
Thanks,
Tiezhu
