I have a virtual machine that since I have upgrade it to Debian wheezy
(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
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
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
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
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
snd_pcm snd_page_alloc snd_timer snd evdev psmouse serio_raw i2c_piix4
i2c_core soundcore pcspkr virtio_balloon processor thermal_sys button
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
usb_common [last unloaded: parport_pc]
[76628.454827]
[76628.454827] Pid: 14919, comm: tar Tainted: P O
3.2.0-4-amd64 #1 Debian 3.2.51-1 Bochs Bochs
[76628.454827] RIP: 0010:[<ffffffffa037988c>] [<ffffffffa037988c>]
lock_page+0x13/0x2c [openafs]
[76628.454827] RSP: 0018:ffff880004d57a68 EFLAGS: 00010246
[76628.454827] RAX: 0000000000000000 RBX: ffffea0003c57da0 RCX:
00000000fffffffa
[76628.454827] RDX: 0000000000000000 RSI: 0000000000000050 RDI:
0000000000004f62
[76628.454827] RBP: ffff880004d57b28 R08: 0000000000004f62 R09:
0000000000000012
[76628.454827] R10: ffff880112cf1280 R11: ffff880112cf1280 R12:
ffff880002164f40
[76628.454827] R13: ffff880115abd480 R14: 0000000000004f62 R15:
0000000000000050
[76628.454827] FS: 00007f7c9a380700(0000) GS:ffff88011fcc0000(0000)
knlGS:0000000000000000
[76628.454827] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[76628.454827] CR2: 0000000000004f62 CR3: 000000000871c000 CR4:
00000000000006e0
[76628.454827] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[76628.454827] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[76628.454827] Process tar (pid: 14919, threadinfo ffff880004d56000,
task ffff8801177eef20)
[76628.454827] Stack:
[76628.454827] ffff880004d57b28 0000000000004f62 ffff880115abd480
ffffffffa037aad0
[76628.454827] ffffea0003920308 0000000000000000 0000000000000000
ffffc900021f3300
[76628.454827] ffff88004b1f9440 ffff880112cf1280 ffff8801177eef20
ffffea0003c57da0
[76628.454827] Call Trace:
[76628.454827] [<ffffffffa037aad0>] ?
afs_linux_read_cache.isra.19+0x14b/0x24d [openafs]
[76628.454827] [<ffffffffa037bc10>] ? afs_linux_readpages+0x471/0x5c6
[openafs]
[76628.454827] [<ffffffff810bd5bd>] ? __do_page_cache_readahead+0x11e/0x1c3
[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
[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
1c f0 ff 43 1c 5b c3 48 83 ec 18 48 89 7c 24 08 e8 5e 46 fd e0 48 8b 7c
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 ]---
--
--
A maior de todas as árvores nasce de uma pequena semente.
--Anônimo
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