Differences

This shows you the differences between two versions of the page.

--- new_server [2017/12/17 11:58] – josh
+++ new_server [2018/01/16 10:35] (current) – josh
@@ Line 191: / Line 191: @@
 Now ''nvme get-feature -f 0x0c -H /dev/nvme0n1'' shows APST is disabled.
+Turned "C6 Mode" back on but have not observed the M.2 drive disappearing problem again with APST disabled.
+===== BUG: soft lockup =====
+A few times after fixing the M.2 drive disappearing issue, my server has frozen. One of the times I caught the console output which listed several messages like "watchdog: BUG: soft lockup - CPU#10 stuck for 22s! [worker:14788]", and one "INFO: rcu_sched detected stalls on CPUs/tasks:" ... "rcu_sched kthread starved for 19150377 jiffies!". I'm not sure what is causing this.
+On 2018-01-08, I upgraded from kernel 4.14.4 to 4.14.11 and added "consoleblank=0" to the kernel command line so if this happens again hopefully I will not lose console output.
+-01-09: Igor seems to be experiencing the same bug and pointed me to https://bugzilla.kernel.org/show_bug.cgi?id=196683. I will probably disable C6 in UEFI setup again.
+-01-15: Got the freeze again after disabling C6 mode in setup. I looked deeper in setup options and found the buried "Global C-State Control" option that Igor and Mike had disabled so I disabled that as well. No freezes since then.