Tainted kernel flags:GW F18

[Dave Jones]

On Thu, Jan 03, 2013 at 12:53:08PM +0000, Frank Murphy wrote:
 > KVM F18.386 Guest instance is not crashing, 
 > as fedora default-kernel but,
 > with dracut.conf 
 > # dracut modules to omit
 > omit_dracutmodules+="plymouth"
 > 
 > just abrt supplying non-reportable kernel crashes
 > repeating the following:
 > 
 > [60233.769804] ------------[ cut here ]------------
 > [60233.769807] WARNING: at lib/list_debug.c:62
 > __list_del_entry+0x86/0xe0() [60233.769808] Hardware name: Bochs
 > [60233.769809] list_del corruption. next->prev should be f5a60734,
 > but was f1765df4 [60233.769810] Modules linked in: nfsv3 nfsv4 nfs
 > dns_resolver fscache nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack
 > nf_conntrack microcode 8139too i2c_piix4 8139cp i2c_core
 > virtio_balloon mii nfsd auth_rpcgss nfs_acl lockd sunrpc xts gf128mul
 > dm_crypt virtio_blk [60233.769823] Pid: 8479, comm: umount.nfs
 > Tainted: G        W    3.6.11-3.fc18.i686 #1 [60233.769824] Call
 > Trace: [60233.769827]  [<c043c642>] warn_slowpath_common+0x72/0xa0
 > [60233.769830]  [<c067ce86>] ? __list_del_entry+0x86/0xe0
 > [60233.769833]  [<c067ce86>] ? __list_del_entry+0x86/0xe0
 > [60233.769835]  [<c043c713>] warn_slowpath_fmt+0x33/0x40
 > [60233.769838]  [<c067ce86>] __list_del_entry+0x86/0xe0
 > [60233.769841]  [<c067ceeb>] list_del+0xb/0x20 [60233.769843]
 > [<c050019e>] release_pages+0x7e/0x210 [60233.769846]  [<c0500d0d>]
 > __pagevec_release+0x1d/0x30 [60233.769849]  [<c05015a3>]
 > truncate_inode_pages_range+0x1d3/0x3b0 [60233.769852]  [<c050185f>]
 > truncate_inode_pages+0x1f/0x30 [60233.769858]  [<f7ee46ba>]
 > nfs_evict_inode+0x1a/0x30 [nfs] [60233.769861]  [<c055ab68>]
 > evict+0x88/0x150 [60233.769863]  [<c055ac61>] dispose_list+0x31/0x40
 > [60233.769866]  [<c055b4ff>] evict_inodes+0x8f/0xc0 [60233.769868]
 > [<c0545c06>] generic_shutdown_super+0x46/0xd0 [60233.769871]
 > [<c0545d11>] kill_anon_super+0x11/0x20 [60233.769877]  [<f7ee663e>]
 > nfs_kill_super+0x1e/0x40 [nfs] [60233.769880]  [<c054606c>]
 > deactivate_locked_super+0x4c/0x80 [60233.769882]  [<c0546a57>]
 > deactivate_super+0x47/0x60 [60233.769884]  [<c055dba7>]
 > mntput_no_expire+0xb7/0x110 [60233.769887]  [<c055e909>]
 > sys_umount+0x69/0x340 [60233.769889]  [<c055ebfe>]
 > sys_oldumount+0x1e/0x20 [60233.769892]  [<c096249f>]
 > sysenter_do_call+0x12/0x28 [60233.769893] ---[ end trace
 > 17e57a02dbb01932 ]--- [60233.769895] 
 > ------------[ cut here]------------
 > 
 > Trying to get a better understanding of whats happening?

In this particular trace, NFS walked a linked list and found
the pointers weren't pointing where they should be. Could be
memory corruption by something other than NFS, or it could be
a bug in NFS. Hard to say.

The 'Tainted: G W' part means something else occurred before this
trace (The W specifically). That may be more enlightening.

	Dave