<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> <title></title> </head> <body bgcolor="#ffffff" text="#000000"> I have been struggling to update my machines to fedora 7 with the latest kernel. We are getting a crash of the kernel as shown below. This happens when we run a "yum upgrade" operation. Our repositories are available on the local LAN segment and mounted via Autofs 5 over NFS4. The system is generally stable using this configuration for other purposes although we occasionally see the same failure when other operations are running. I have been unable to find any reference to this failure in association with this version of the kernel, although similar failures were reported about six months ago for 2.6.17 pre-release kernels. Does anybody have any idea what is causing the failure, whether this is something that there is a fix for, and whether other people are seeing it and if so what work rounds they have used. Traceback on the console is as follows: <blockquote>BUG: unable to handle kernel NULL pointer dereference at virtual address 0000000 c printing eip: f8cea941 *pde = 24fd0067 *pte = 00000000 Oops: 0000 [#1] SMP last sysfs file: /kernel/uevent_seqnum Modules linked in: appletalk nfs nfsd exportfs lockd nfs_acl autofs4 rpcsec_gss_ krb5 auth_rpcgss des sunrpc bonding ipv6 ext2 loop video sbs button dock battery ac sr_mod cdrom ata_generic e100 mii parport_pc parport ata_piix i2c_piix4 seri o_raw rtc_cmos libata i2c_core e1000 floppy sg dm_snapshot dm_zero dm_mirror dm_ mod sym53c8xx scsi_transport_spi sd_mod scsi_mod raid456 xor raid1 ext3 jbd mbca che ehci_hcd ohci_hcd uhci_hcd CPU: 2 EIP: 0060:[<f8cea941>] Not tainted VLI EFLAGS: 00210246 (2.6.22.1-41.fc7 #1) EIP is at nfs_update_inode+0xba/0x649 [nfs] eax: 00000000 ebx: 000081a4 ecx: 000081a4 edx: 00008000 esi: e999eb40 edi: f40ccab0 ebp: edd108c8 esp: deb91de4 ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068 Process umount.nfs4 (pid: 22737, ti=deb91000 task=f5058c00 task.ti=deb91000) Stack: c300034c eddc9740 00000004 00000000 f5058c00 c0436fe2 deb91dfc 00000000 f40ccab0 edd10798 00cd4f8f c042f18c eddc96c0 00000000 edd108c8 f40ccab0 eddc96c0 edd108c8 f8cebf0d f40cca00 00000000 f8cf8465 f40cca00 df2fd010 Call Trace: [<c0436fe2>] wake_bit_function+0x0/0x3c [<c042f18c>] sigprocmask+0xa1/0xbe [<f8cebf0d>] nfs_post_op_update_inode+0x27/0x33 [nfs] [<f8cf8465>] nfs4_proc_delegreturn+0x131/0x172 [nfs] [<f8d02b85>] nfs_do_return_delegation+0xf/0x1d [nfs] [<f8ce9364>] nfs_dentry_iput+0x1d/0x60 [nfs] [<c0487922>] shrink_dcache_for_umount_subtree+0x194/0x1de [<c04742f2>] add_partial+0x19/0x20 [<c0474fbb>] __slab_free+0x5c/0x235 [<c04774e8>] percpu_depopulate+0x10/0x1a [<c048834a>] shrink_dcache_for_umount+0x2a/0x36 [<c047a8ee>] generic_shutdown_super+0x15/0xb7 [<c047a9b4>] kill_anon_super+0x9/0x2f [<f8ceca03>] nfs_kill_super+0xc/0x14 [nfs] [<c047aa43>] deactivate_super+0x52/0x65 [<c048b983>] expire_mount_list+0xf0/0x125 [<c048c8c3>] shrink_submounts+0x32/0xab [<c048baab>] sys_umount+0xf3/0x21a [<c04527db>] audit_syscall_entry+0x10d/0x137 [<c048bbe9>] sys_oldumount+0x17/0x1a [<c0404f8e>] syscall_call+0x7/0xb ======================= Code: 20 0f b7 5d 6e 89 c8 89 da 25 00 f0 00 00 81 e2 00 f0 00 00 39 c2 0f 85 92 04 00 00 8b 85 9c 00 00 00 8b b0 64 01 00 00 8b 40 38 <3b> 68 0c 75 52 83 c7 44 89 7c 24 30 8b 7c 24 20 8d 46 78 89 44 EIP: [<f8cea941>] nfs_update_inode+0xba/0x649 [nfs] SS:ESP 0068:deb91de4 </blockquote> Regards, Howard <div class="moz-signature">-- <title>Signature</title> <div class="Section1"> <table class="MsoNormalTable" style="width: 100%;" border="0" cellpadding="0" width="100%"> <tbody> <tr style=""> <td style="padding: 1.5pt;" valign="top"> Howard Wilkinson </td> <td style="padding: 1.5pt;" valign="top"> Phone: </td> <td style="padding: 1.5pt;" valign="top"> +44(20)76907075 </td> </tr> <tr style=""> <td style="padding: 1.5pt;" valign="top"> Coherent Technology Limited </td> <td style="padding: 1.5pt;" valign="top"> Fax: </td> <td style="padding: 1.5pt;" valign="top"> </td> </tr> <tr style=""> <td style="padding: 1.5pt;" valign="top"> 23 Northampton Square, </td> <td style="padding: 1.5pt;" valign="top"> Mobile: </td> <td style="padding: 1.5pt;" valign="top"> +44(7980)639379 </td> </tr> <tr style=""> <td style="padding: 1.5pt;" valign="top"> United Kingdom, EC1V 0HL </td> <td style="padding: 1.5pt;" valign="top"> Email: </td> <td style="padding: 1.5pt;" valign="top"> <a name="howardcohtech.com"></a><a class="moz-txt-link-abbreviated" href="mailto:howard@cohtech.com">howard@cohtech.com</a> </td> </tr> </tbody> </table> </div> </div> </body> </html>