(In reply to Michael from comment #459) > I think this bug is mostly about the official AMD Errata 1109 "MWAIT > Instruction May Hang a Thread". > > This is described here ( > https://developer.amd.com/wp-content/resources/55449_1.12.pdf ) as: > > "Under a highly specific and detailed set of internal timing conditions, the > MWAIT instruction may cause a > thread to hang in SMT (Simultaneous Multithreading) Mode." > > Since this is a nofix for AMD, this must be fixed by the OS. The AMD > document states: > > "Suggested Workaround > System software may contain the workaround for this erratum." > > So, unfortunately AMD will never solve that hardware error. I suggest they > change the first two letters of their company name ;) > > This in fact leaves every linux system with a Ryzen CPU instable, so this > should be considered serious. > > I didn't read a comment from any kernel developer in the history of this bug > report. Did I overlook something? > > Question: Will the Linux kernel ever implement a workaround (as suggested by > AMD??
idle=nomwait kernel option fixed all hangs for me -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1690085 Title: Ryzen 1800X freeze - rcu_sched detected stalls on CPUs/tasks To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1690085/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
