[Xen-users] Kernel Ooops when shutting down DomU

[Gareth Bult <gareth@xxxxxxxxxxxxx>]

Hi,

I've tried to migrate a couple of DomU's from the "file" driver to the "tap:aio" driver. It seems to work Ok, but when I shutdown the DomU I get a kernel Ooops.
(everything seems to continue Ok, but it's a little worrying)

Here it is;

Jan 19 14:35:41 nodeb kernel: [57422.245160] Unable to handle kernel NULL pointer dereference at 0000000000000090 RIP: 
Jan 19 14:35:41 nodeb kernel: [57422.245172]  [zap_page_range+125/288] zap_page_range+0x7d/0x120
Jan 19 14:35:41 nodeb kernel: [57422.245192] PGD 50dc067 PUD 176e7067 PMD 0 
Jan 19 14:35:41 nodeb kernel: [57422.245202] Oops: 0000 [11] SMP 
Jan 19 14:35:41 nodeb kernel: [57422.245209] CPU 1 
Jan 19 14:35:41 nodeb kernel: [57422.245214] Modules linked in: iptable_raw xt_physdev af_packet bridge tun nf_conntrack_ftp nf_conntrack_irc ipt_LOG xt_limit xt_tcpudp xt_state nf_conntrack_ipv4 nf_conntrack nfnetlink iptable_filter ip_tables x_tables parport_pc lp parport loop 8250_pnp 8250 serial_core serio_raw iTCO_wdt iTCO_vendor_support pcspkr psmouse shpchp pci_hotplug e752x_edac edac_mc ipv6 evdev ext3 jbd mbcache sg sd_mod ata_piix ata_generic libata scsi_mod e1000 ehci_hcd uhci_hcd usbcore raid10 raid456 xor raid1 raid0 multipath linear md_mod dm_mirror dm_snapshot dm_mod thermal processor fan fuse apparmor commoncap
Jan 19 14:35:41 nodeb kernel: [57422.245321] Pid: 27834, comm: tapdisk Not tainted 2.6.22-14-xen #1
Jan 19 14:35:41 nodeb kernel: [57422.245327] RIP: e030:[zap_page_range+125/288]  [zap_page_range+125/288] zap_page_range+0x7d/0x120
Jan 19 14:35:41 nodeb kernel: [57422.245338] RSP: e02b:ffff88000e59bea8  EFLAGS: 00010246
Jan 19 14:35:41 nodeb kernel: [57422.245345] RAX: 0000000000000000 RBX: ffff880001ba6420 RCX: 0000000000000000
Jan 19 14:35:41 nodeb kernel: [57422.245354] RDX: 0101010101010101 RSI: 00002b01657f0000 RDI: 0000000000000000
Jan 19 14:35:41 nodeb kernel: [57422.245359] RBP: 0000000000000000 R08: ffffffff80547710 R09: 0000000000000000
Jan 19 14:35:41 nodeb kernel: [57422.245365] R10: 0000000000000000 R11: ffffffffff5f9040 R12: 00002b01657f0000
Jan 19 14:35:41 nodeb kernel: [57422.245371] R13: ffff8800177ca738 R14: 0000000000161000 R15: 0000000000000000
Jan 19 14:35:41 nodeb kernel: [57422.245381] FS:  00002b0166d46f40(0000) GS:ffffffff80575080(0000) knlGS:0000000000000000
Jan 19 14:35:41 nodeb kernel: [57422.245386] CS:  e033 DS: 0000 ES: 0000
Jan 19 14:35:41 nodeb kernel: [57422.245392] Process tapdisk (pid: 27834, threadinfo ffff88000e59a000, task ffff88001f29c000)
Jan 19 14:35:41 nodeb kernel: [57422.245397] Stack:  ffff8800177ca738 0000000000000000 ffff880001ba6420 ffff880017468f00
Jan 19 14:35:41 nodeb kernel: [57422.245410]  ffff88001a651200 ffff880012a060c0 ffff880012a060c0 ffff88001e614e00
Jan 19 14:35:41 nodeb kernel: [57422.245421]  ffff88000464c0d0 ffffffff8039af3e 0000000000000008 ffffffff80290f41
Jan 19 14:35:41 nodeb kernel: [57422.245431] Call Trace:
Jan 19 14:35:41 nodeb kernel: [57422.245466]  [blktap_release+142/208] blktap_release+0x8e/0xd0
Jan 19 14:35:41 nodeb kernel: [57422.245479]  [__fput+193/480] __fput+0xc1/0x1e0
Jan 19 14:35:41 nodeb kernel: [57422.245506]  [filp_close+84/144] filp_close+0x54/0x90
Jan 19 14:35:41 nodeb kernel: [57422.245522]  [sys_close+150/240] sys_close+0x96/0xf0
Jan 19 14:35:41 nodeb kernel: [57422.245539]  [system_call+134/139] system_call+0x86/0x8b
Jan 19 14:35:41 nodeb kernel: [57422.245560]  [system_call+0/139] system_call+0x0/0x8b
Jan 19 14:35:41 nodeb kernel: [57422.245590] 
Jan 19 14:35:41 nodeb kernel: [57422.245593] 
Jan 19 14:35:41 nodeb kernel: [57422.245595] Code: 48 8b 95 90 00 00 00 48 8b 85 98 00 00 00 48 8d 04 02 48 3b 
Jan 19 14:35:41 nodeb kernel: [57422.245620] RIP  [zap_page_range+125/288] zap_page_range+0x7d/0x120
Jan 19 14:35:41 nodeb kernel: [57422.245629]  RSP <ffff88000e59bea8>
Jan 19 14:35:41 nodeb kernel: [57422.245634] CR2: 0000000000000090

Stock Ubuntu/Gutsy Xen3.1 kernel.

Here's the .cfg;

kernel        = '/boot/vmlinuz-2.6.22-14-xen'
ramdisk       = '/boot/initrd.img-2.6.22-14-xen'
memory        = '200'
root          = '/dev/xvda ro'
disk          = [ 'tap:aio:/vols/images/domains/ndb2/disk.img,xvda,w', 'tap:aio:/vols/images/domains/ndb2/swap.img,xvdb,w' ]
name          = 'ndb2'
vif           = [ 'ip=10.0.0.17,mac=00:00:10:00:00:17,bridge=xenbr0' ]
on_poweroff   = 'destroy'
on_reboot     = 'restart'
on_crash      = 'restart'
serial_device = 'xvc0'
extra         = "clock=jiffies selinux=0 raid=noautodetect"

Can anyone comment / help?
Is this likely to cause a problem / is there a fix?

(no errors using the "file" driver)

..
Gareth.


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