From: Quentin Godfroy <godfroy@clipper.ens.fr>
Subject: NFSD3 : oops with sec=krb5 and RPCSEC_GSS_KRB5 not compiled in
Date: Tue, 30 Oct 2007 00:35:30 +0100
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Hi,

on a 2.6.22.6, when trying to change an already mounted nfsv3 export from
sec=sys to sec=krb5, with CONFIG_RPCSEC_GSS_KRB5 not compiled in (which
meant that the rps.svcgssd service was refusing to run), i got the
following oops on the server side :

>BUG: unable to handle kernel NULL pointer dereference at virtual address
>00000008
> printing eip:
>d0af084b
>*pde = 00000000
>Oops: 0000 [#1]
>Modules linked in: nfsd exportfs lockd nfs_acl sunrpc ipt_LOG ipt_recent
>ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables ipv6 ebtable_broute
>ebtable_nat ebtable_filter ebtables tcp_diag inet_diag floppy uhci_hcd
>iTCO_wdt usbcore
>CPU:    0
>EIP:    0060:[<d0af084b>]    Not tainted VLI
>EFLAGS: 00010246   (2.6.22.6-pluton #1)
>EIP is at encode_fsid+0x7b/0xa0 [nfsd]
>eax: c58ed0e0   ebx: c9ebb004   ecx: 00000000   edx: 00000002
>esi: c1f58048   edi: c9ebb0ec   ebp: c9ebb004   esp: c599ff18
>ds: 007b   es: 007b   fs: 0000  gs: 0000  ss: 0068
>Process nfsd (pid: 13237, ti=c599e000 task=cbea9a50 task.ti=c599e000)
>Stack: 00000000 c1f58038 d0af0922 c9d7cb40 d0aeeeef 00000000 c9ec4000
>d0af1e30 
>       d0b0f464 c1f58014 d0af1e50 c9ebb0ec c9ec4000 d0ae327f c9ec4000
>cb01a504 
>       c9ec4000 c1f58000 c9ec4000 00000000 c9ebb138 cab1f480 d0a89a34
>c9ec4000 
>Call Trace:
> [<d0af0922>] encode_fattr3+0xb2/0x140 [nfsd]
> [<d0aeeeef>] nfsd3_proc_getattr+0xff/0x110 [nfsd]
> [<d0af1e30>] nfs3svc_encode_attrstat+0x0/0x40 [nfsd]
> [<d0af1e50>] nfs3svc_encode_attrstat+0x20/0x40 [nfsd]
> [<d0ae327f>] nfsd_dispatch+0xef/0x200 [nfsd]
> [<d0a89a34>] svc_process+0x444/0x7e0 [sunrpc]
> [<c010496b>] common_interrupt+0x23/0x28
> [<d0ae3895>] nfsd+0x155/0x260 [nfsd]
> [<d0ae3740>] nfsd+0x0/0x260 [nfsd]
> [<c0104aeb>] kernel_thread_helper+0x7/0x1c
> =======================
>Code: c3 8b 83 88 00 00 00 8b 48 30 89 cb c1 fb 1f 89 d8 0f c8 89 06 89 c8
>0f c8 89 46 04 8d 46 08 5b 5e c3 8b 83 88 00 00 00 8b 48 34 <8b> 59 08 8b 01
>8b 51 04 31 d8 8b 59 0c 0f c8 89 46 04 8d 46 08 
>EIP: [<d0af084b>] encode_fsid+0x7b/0xa0 [nfsd] SS:ESP 0068:c599ff18


Moreover, all the other exported mounts freezed instantly, and the only
solution was to reboot the server.

The configure file is on
http://www.eleves.ens.fr/home/godfroy/config-2.6.22.6

Quentin Godfroy

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