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--- docs:vserver [2015-04-14 19:02]
glen [Installing Vserver host on PLD Linux]
+++ docs:vserver [2015-10-05 14:25]
arekm
@@ Line 713: / Line 713: @@
 You need ''CAP_AUDIT_CONTROL'' in ''bcapabilities'' and lower ''priority_boost'' to ''0'' in ''/etc/audit/auditd.conf''
+==== XFS filesystem - kernel upgrade causes xfs related oops (xfs_filestream_lookup_ag) ====
+After upgrading from 2.6-3.4 kernels (possibly other versions) to 3.18 (tested, possibly other versions) kernel ooppses
+almost immediately after accessing some files on xfs filesystem with ''xfs_filestream_lookup_ag'' visible in stack trace
+(or other filestream related function).
+That's because vserver patch for kernels earlier than 2.6.23 patched xfs filesystem to introduce new flag:
+<file>
+#define XFS_XFLAG_BARRIER     0x00004000      /* chroot() barrier */
+</file>
+Starting with kernel 2.6.23 kernel introduced filestreams which are using 0x00004000 bit, thus causing conflict with vserver.
+<file>
+#define XFS_XFLAG_FILESTREAM   0x00004000      /* use filestream allocator */
+</file>
+Vserver stopped adding such xfs xflag in 3.13 BUT your existing filesystem can still have XFS_XFLAG_BARRIER (0x00004000) set
+causing oops in newer kernels.
 ===== Debian or Ubuntu guest installation =====

PLD Linux Distribution