[OpenAFS] BUG: unable to handle kernel paging request at 0000000000004f62

[Jose Manuel dos Santos Calhariz]

I have a virtual machine that since I have upgrade it to Debian wheezy=20
(v7.0), Linux kernel 3.2, it started to give BUG messages.
This machine runs every night, tar commands to do, backups of the files=20
of AFS.  Usually at the second night I get this BUG messages
and some of the running tar stops.

The openafs kernel module is the same version previous and after the=20
upgrade.  So this can be a possible incompatibility between
kernel 3.2 and openafs 1.6.5., where the kernel 2.6.32 worked fine.

I want to collect more information before doing a proper bug report=20
against Debian openafs-client and openafs-modules-dkms.

The stack strace of the BUG error.

[76628.451414] BUG: unable to handle kernel paging request at=20
0000000000004f62
[76628.452165] IP: [<ffffffffa037988c>] lock_page+0x13/0x2c [openafs]
[76628.452840] PGD 2f60e067 PUD 83828067 PMD 0
[76628.453432] Oops: 0002 [#1] SMP
[76628.453979] CPU 3
[76628.454079] Modules linked in: lp parport_pc parport joydev st sr_mod =

cdrom openafs(P) nfsd nfs nfs_acl auth_rpcgss fscache lockd sunrpc loop=20
snd_pcm snd_page_alloc snd_timer snd evdev psmouse serio_raw i2c_piix4=20
i2c_core soundcore pcspkr virtio_balloon processor thermal_sys button=20
xfs dm_mod sg sd_mod crc_t10dif virtio_net ata_generic floppy virtio_pci =

virtio_ring virtio ata_piix libata uhci_hcd ehci_hcd usbcore scsi_mod=20
usb_common [last unloaded: parport_pc]
[76628.454827]
[76628.454827] Pid: 14919, comm: tar Tainted: P           O=20
3.2.0-4-amd64 #1 Debian 3.2.51-1 Bochs Bochs
[76628.454827] RIP: 0010:[<ffffffffa037988c>]  [<ffffffffa037988c>]=20
lock_page+0x13/0x2c [openafs]
[76628.454827] RSP: 0018:ffff880004d57a68  EFLAGS: 00010246
[76628.454827] RAX: 0000000000000000 RBX: ffffea0003c57da0 RCX:=20
00000000fffffffa
[76628.454827] RDX: 0000000000000000 RSI: 0000000000000050 RDI:=20
0000000000004f62
[76628.454827] RBP: ffff880004d57b28 R08: 0000000000004f62 R09:=20
0000000000000012
[76628.454827] R10: ffff880112cf1280 R11: ffff880112cf1280 R12:=20
ffff880002164f40
[76628.454827] R13: ffff880115abd480 R14: 0000000000004f62 R15:=20
0000000000000050
[76628.454827] FS:  00007f7c9a380700(0000) GS:ffff88011fcc0000(0000)=20
knlGS:0000000000000000
[76628.454827] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[76628.454827] CR2: 0000000000004f62 CR3: 000000000871c000 CR4:=20
00000000000006e0
[76628.454827] DR0: 0000000000000000 DR1: 0000000000000000 DR2:=20
0000000000000000
[76628.454827] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:=20
0000000000000400
[76628.454827] Process tar (pid: 14919, threadinfo ffff880004d56000,=20
task ffff8801177eef20)
[76628.454827] Stack:
[76628.454827]  ffff880004d57b28 0000000000004f62 ffff880115abd480=20
ffffffffa037aad0
[76628.454827]  ffffea0003920308 0000000000000000 0000000000000000=20
ffffc900021f3300
[76628.454827]  ffff88004b1f9440 ffff880112cf1280 ffff8801177eef20=20
ffffea0003c57da0
[76628.454827] Call Trace:
[76628.454827]  [<ffffffffa037aad0>] ?=20
afs_linux_read_cache.isra.19+0x14b/0x24d [openafs]
[76628.454827]  [<ffffffffa037bc10>] ? afs_linux_readpages+0x471/0x5c6=20
[openafs]
[76628.454827]  [<ffffffff810bd5bd>] ? __do_page_cache_readahead+0x11e/0x=
1c3
[76628.454827]  [<ffffffff810bd8ba>] ? ra_submit+0x19/0x1d
[76628.454827]  [<ffffffff810b616b>] ? generic_file_aio_read+0x2be/0x5cf
[76628.454827]  [<ffffffff81036628>] ? should_resched+0x5/0x23
[76628.454827]  [<ffffffffa037a574>] ? afs_linux_aio_read+0x114/0x1d5=20
[openafs]
[76628.454827]  [<ffffffff810fa140>] ? do_sync_read+0xb4/0xec
[76628.454827]  [<ffffffff810fa832>] ? vfs_read+0xa6/0xe6
[76628.454827]  [<ffffffff810fa8b7>] ? sys_read+0x45/0x6b
[76628.454827]  [<ffffffff81354212>] ? system_call_fastpath+0x16/0x1b
[76628.454827] Code: fb f6 c4 80 74 09 e8 4b 4c d4 e0 84 c0 75 07 8b 43=20
1c f0 ff 43 1c 5b c3 48 83 ec 18 48 89 7c 24 08 e8 5e 46 fd e0 48 8b 7c=20
24 08 <f0> 0f ba 2f 00 19 c0 85 c0 74 09 48 83 c4 18 e9 d5 b1 d3 e0 48
[76628.454827] RIP  [<ffffffffa037988c>] lock_page+0x13/0x2c [openafs]
[76628.454827]  RSP <ffff880004d57a68>
[76628.454827] CR2: 0000000000004f62
[76628.487894] ---[ end trace 7723dedac22da92d ]---



--=20
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A maior de todas as =C3=A1rvores nasce de uma pequena semente.

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