Bug#607604: linux-image-2.6.32-5-openvz-amd64: nfsd oops after 'exportfs -ra'
Hi Steven
Thanks for your report. Could you try this with an unpatched kernel as
this could be due to that the IPv6 actually works now.
Just to check.
Thanks in advance,
// Ola
On Mon, Dec 20, 2010 at 07:30:28AM +0000, Steven Chamberlain wrote:
> Hi,
>
> This was readily reproducible just now after a reboot, on the same
> server and same kernel.
>
> Upon boot, four exports of /var/lib/tftpboot were loaded from /etc/exports.
>
> I then did:
>
> # mount --bind /home/whatever /var/lib/tftpboot
> # exportfs -ra
>
> I hadn't actually altered /etc/exports since boot, so I wasn't
> adding/removing any exports.
>
> This did not immediately trigger an oops. The oops occurred as soon as
> I tried to mount the nfs export from a remote system:
>
> [ 524.907772] BUG: unable to handle kernel NULL pointer dereference at
> 0000000000000008
> [ 524.911696] IP: [<ffffffffa0664601>] exportfs_decode_fh+0x40/0x213
> [exportfs]
> [ 524.911696] PGD 7e49d067 PUD 7e5bd067 PMD 0
> [ 524.911696] Oops: 0000 [#1] SMP
> [ 524.911696] last sysfs file:
> /sys/devices/pci0000:00/0000:00:19.3/temp3_input
> [ 524.911696] CPU 1
> [ 524.911696] Modules linked in: vzethdev vznetdev simfs vzrst vzcpt
> vzdquota vzmon vzdev ip6t_frag xt_DSCP xt_owner xt_length xt_hl
> xt_tcpmss xt_TCPMSS xt_dscp nfsd exportfs nfs lockd fscache nfs_acl
> auth_rpcgss sunrpc sit tunnel4 ip6t_LOG ip6t_REJECT ip6table_filter
> bridge ip6table_mangle ip6_tables xt_limit ipt_REJECT xt_state
> iptable_filter iptable_mangle ipt_LOG ipt_MASQUERADE xt_tcpudp
> xt_hashlimit xt_multiport act_police cls_u32 sch_ingress iptable_nat
> nf_nat nf_conntrack_ipv4 sch_htb nf_conntrack nf_defrag_ipv4 ip_tables
> x_tables aufs(C) 8021q garp stp powernow_k8 ipmi_si ipmi_devintf
> ipmi_msghandler loop snd_pcm snd_timer snd soundcore snd_page_alloc
> amd64_edac_mod i2c_amd756 i2c_core psmouse container serio_raw evdev
> button edac_core pcspkr edac_mce_amd amd_rng shpchp processor k8temp
> rng_core pci_hotplug reiserfs sha256_generic aes_x86_64 aes_generic cbc
> dm_crypt dm_mod raid456 async_raid6_recov async_pq raid6_pq async_xor
> xor async_memcpy async_tx raid1 md_mod sd_mod crc_t10dif usbhid hid sg
> sr_mod cdrom ata_generic mptspi mptscsih ohci_hcd tg3 mptbase pata_amd
> qla2xxx libata floppy libphy aic7xxx ehci_hcd scsi_transport_spi
> scsi_transport_fc scsi_tgt thermal thermal_sys scsi_mod usbcore nls_base
> [last unloaded: scsi_wait_scan]
> [ 524.911696] Pid: 2301, comm: nfsd Tainted: G C
> 2.6.32-5-openvz-amd64 #1 dzhanibekov Sun Fire V20z
> [ 524.911696] RIP: 0010:[<ffffffffa0664601>] [<ffffffffa0664601>]
> exportfs_decode_fh+0x40/0x213 [exportfs]
> [ 524.911696] RSP: 0018:ffff88007ed91ba0 EFLAGS: 00010246
> [ 524.911696] RAX: 0000000000000000 RBX: 0000000000000000 RCX:
> 0000000000000003
> [ 524.911696] RDX: 0000000000000003 RSI: ffff88007ed10028 RDI:
> ffff8800be16f800
> [ 524.911696] RBP: 0000000000000003 R08: ffffffffa066ce44 R09:
> ffff8800beeb9700
> [ 524.911696] R10: 0000000000000000 R11: 7800000000000000 R12:
> ffff88007ed10028
> [ 524.911696] R13: ffff8800bef20f00 R14: 0000000000000003 R15:
> ffff88007ed10028
> [ 524.911696] FS: 00007f0a4baf1720(0000) GS:ffff880001900000(0000)
> knlGS:00000000b732f6c0
> [ 524.911696] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
> [ 524.911696] CR2: 0000000000000008 CR3: 000000007da2b000 CR4:
> 00000000000006e0
> [ 524.911696] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> [ 524.911696] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
> 0000000000000400
> [ 524.911696] Process nfsd (pid: 2301, veid=0, threadinfo
> ffff88007ed90000, task ffff88007da79000)
> [ 524.911696] Stack:
> [ 524.911696] ffff8800beeb9700 ffffffffa066ce44 ffff88007ed91c20
> 000000000000000b
> [ 524.911696] <0> ffff88007ed91c6c ffffffffa05a72a9 ffff8800a19e4ac0
> ffff8800a19e4ac0
> [ 524.911696] <0> ffff88007ed10010 ffff8800bef20f00 ffff880094854a20
> ffff88005b28b018
> [ 524.911696] Call Trace:
> [ 524.911696] [<ffffffffa066ce44>] ? nfsd_acceptable+0x0/0x10c [nfsd]
> [ 524.911696] [<ffffffffa05a72a9>] ? cache_check+0x5f/0x2e3 [sunrpc]
> [ 524.911696] [<ffffffffa0671c7b>] ? exp_find_key+0x69/0x7e [nfsd]
> [ 524.911696] [<ffffffff8103faa1>] ? update_curr+0xa2/0x10e
> [ 524.911696] [<ffffffff8103fe23>] ? check_preempt_wakeup+0x1cd/0x268
> [ 524.911696] [<ffffffff8109996a>] ? rcu_start_gp+0x197/0x1c0
> [ 524.911696] [<ffffffffa066d2e7>] ? fh_verify+0x31b/0x574 [nfsd]
> [ 524.911696] [<ffffffff8103a7e6>] ? __wake_up_common+0x44/0x73
> [ 524.911696] [<ffffffff8103f716>] ? __wake_up+0x30/0x44
> [ 524.911696] [<ffffffffa066db85>] ? nfsd_access+0x29/0xff [nfsd]
> [ 524.911696] [<ffffffffa0675b9b>] ? nfsd3_proc_access+0x70/0x7d [nfsd]
> [ 524.911696] [<ffffffffa066a329>] ? nfsd_dispatch+0xdd/0x1b9 [nfsd]
> [ 524.911696] [<ffffffffa059ebd1>] ? svc_process+0x3f5/0x619 [sunrpc]
> [ 524.911696] [<ffffffffa066a772>] ? nfsd+0x0/0x12e [nfsd]
> [ 524.911696] [<ffffffffa066a857>] ? nfsd+0xe5/0x12e [nfsd]
> [ 524.911696] [<ffffffff8106650e>] ? kthread+0xc0/0xca
> [ 524.911696] [<ffffffff81011c6a>] ? child_rip+0xa/0x20
> [ 524.911696] [<ffffffff8106644e>] ? kthread+0x0/0xca
> [ 525.326092] [<ffffffff81011c60>] ? child_rip+0x0/0x20
> [ 525.328027] Code: 48 81 ec 28 01 00 00 65 48 8b 04 25 28 00 00 00 48
> 89 84 24 18 01 00 00 31 c0 4c 89 44 24 08 4c 89 0c 24 48 8b 7f 28 48 8b
> 5f 50 <ff> 53 08 48 85 c0 49 89 c4 75 0c 49 c7 c4 8c ff ff ff e9 8d 01
> [ 525.352026] RIP [<ffffffffa0664601>] exportfs_decode_fh+0x40/0x213
> [exportfs]
> [ 525.352026] RSP <ffff88007ed91ba0>
> [ 525.352026] CR2: 0000000000000008
> [ 525.373343] ---[ end trace 16befdc2c233113f ]---
>
> Regards,
> --
> Steven Chamberlain
> steven@pyro.eu.org
>
>
>
> --
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>
>
--
--------------------- Ola Lundqvist ---------------------------
/ opal@debian.org Annebergsslingan 37 \
| ola@inguza.com 654 65 KARLSTAD |
| http://inguza.com/ +46 (0)70-332 1551 |
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