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? It would also be nice to include these messages (not for all tasks) to the commit message. Regards Miroslav
