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--- linux:general:troubleshooting [2019/01/24 17:01] – lunetikk
+++ linux:general:troubleshooting [2019/10/07 18:06] – lunetikk
@@ Line 166: / Line 166: @@
 \\
-==== Cant mount Windowsshares (CIFS) on Linux ====
+==== Bug: soft lockup in messages ====
 === Description ===
-Mounting your share leads to the following error
+You can find multiple "Bug: soft lockup" entries in /var/log/messages or journalctl
 <code>
-mount error(9): Bad file descriptor
+May 25 07:23:59 XXXXXXX kernel: [13445315.881356] BUG: soft lockup - CPU#16 stuck for 23s! [yyyyyyy:81602]
 </code>
 === Reason ===
-Microsoft released an Update (January 8, 2019 (Monthly Rollup)) which broke smb2.0 and 2.1 connections.\\
+>A 'soft lockup' is defined as a bug that causes the kernel to loop in kernel mode for more than 20 seconds without giving other tasks a chance to run. The watchdog daemon will send an non-maskable interrupt (NMI) to all CPUs in the system who, in turn, print the stack traces of their currently running tasks.
+-SUSE KB [[https://www.suse.com/support/kb/doc/?id=7017652|7017652]]
-The issue affect Windows 7 and Windows Server 2008 (R2).
+=== Fix ===
-[[https://www.theregister.co.uk/2019/01/09/windows_7_network_broken/|https://www.theregister.co.uk/2019/01/09/windows_7_network_broken/]]
+__Solution 1:__
-[[https://serverfault.com/questions/948263/kb-4480970-and-or-kb-4480960-breaks-smb2-connections-to-windows-7-shares|https://serverfault.com/questions/948263/kb-4480970-and-or-kb-4480960-breaks-smb2-connections-to-windows-7-shares]]
+Restart your system and/ or decrease your CPU load.
-=== Fix ===
+__Solution 2:__
-Microsoft released a fix to fix their update... m(
+Increase the time (default 10) before soft lockups are fired.
-<code>
-update-grub
-This update resolves the issue where local users who are part of the local “Administrators“ group may not be able to remotely access shares on Windows 7 SP1 and Windows Server 2008 R2 machines after installing the January 8th, 2019 security updates. This does not affect domain accounts in the local "Administrators" group.
-</code>
-Download KB4487345 and install the fix: [[http://www.catalog.update.microsoft.com/Search.aspx?q=KB4487345|KB4487345]]
+<code bash >echo 20 > /proc/sys/kernel/watchdog_thresh</code>
+or
+<code bash>
+echo "kernel.watchdog_thresh=20" > /etc/sysctl.d/99-watchdog_thresh.conf
+sysctl -p  /etc/sysctl.d/99-watchdog_thresh.conf
+</code>
 \\
 \\

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