I can confirm this bug - although I did not explicitly switch to tap
devices. My VM came "preconfigured" with tap (created by ConVirt)

2.6.22-14-xen #1 SMP Tue Feb 12 09:27:26 UTC 2008 i686 GNU/Linux

[ 1944.442170] BUG: unable to handle kernel NULL pointer dereference at virtual 
address 00000010
[ 1944.442247]  printing eip:
[ 1944.442268] c016049d
[ 1944.442273] 2c6f8000 -> *pde = 00000000:51196001
[ 1944.442298] 2c196000 -> *pme = 00000000:00000000
[ 1944.442325] Oops: 0000 [#1]
[ 1944.442346] SMP
[ 1944.442377] Modules linked in: xt_physdev iptable_filter ip_tables x_tables 
binfmt_misc bridge af_packet nfsd exportfs lockd sunrpc ext2 nf_nat_irc 
nf_nat_ftp nf_nat nf_conntrack_irc nf_conntrack_ftp nf_conntrack_ipv4 
nf_conntrack nfnetlink psmouse parport_pc lp parport ipv6 snd_intel8x0 
snd_ac97_codec ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy 
snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer 
snd_seq_device pcspkr snd soundcore snd_page_alloc shpchp i2c_nforce2 
pci_hotplug i2c_core nvidia_agp agpgart evdev ext3 jbd mbcache ide_disk amd74xx 
ide_core ata_generic libata scsi_mod ehci_hcd forcedeth ohci_hcd usbcore 
dm_mirror dm_snapshot dm_mod thermal processor fan capability commoncap fuse
[ 1944.442946] CPU:    0
[ 1944.442947] EIP:    0061:[<c016049d>]    Not tainted VLI
[ 1944.442949] EFLAGS: 00210206   (2.6.22-14-xen #1)
[ 1944.443024] EIP is at unmap_vmas+0x1bd/0xbf0
[ 1944.443049] eax: b7c9efff   ebx: bfffffff   ecx: 00000010   edx: b7c9f000
[ 1944.443077] esi: ec1b0f78   edi: b7b3e000   ebp: ec1b0d10   esp: ec1a1e4c
[ 1944.443105] ds: 007b   es: 007b   fs: 00d8  gs: 0033  ss: 0069
[ 1944.443133] Process tapdisk (pid: 5622, ti=ec1a0000 task=ec652f90 
task.ti=ec1a0000)
[ 1944.443161] Stack: 00000000 00000000 c01181ee 00000000 00000000 b7c9efff 
00000061 80000000
[ 1944.443245]        51135067 00000000 51135067 b7c9efff 51135067 00000000 
0005ac95 00000000
[ 1944.443329]        5ac95000 00000000 0005ac95 00000000 5ac95000 00000000 
b7b3e000 ec1b0d10
[ 1944.443413] Call Trace:
[ 1944.443453]  [<c01181ee>] kunmap_atomic+0x3e/0x60
[ 1944.443509]  [<c016364c>] free_pgd_range+0x24c/0x350
[ 1944.443553]  [<c0160f64>] zap_page_range+0x94/0xf0
[ 1944.443590]  [<c02698ff>] blktap_release+0x4f/0x90
[ 1944.443627]  [<c017ba2d>] __fput+0xad/0x1a0
[ 1944.443664]  [<c0178e07>] filp_close+0x47/0x80
[ 1944.443697]  [<c017a22b>] sys_close+0x6b/0xd0
[ 1944.443730]  [<c01055a2>] syscall_call+0x7/0xb
[ 1944.443772]  =======================
[ 1944.443795] Code: 89 5c 24 7c 83 eb 01 39 c3 89 9c 24 bc 00 00 00 72 12 8b 
94 24 c4 00 00 00 89 84 24 bc 00 00 00 89 54 24 7c 8b 8c 24 80 00 00 00 <8b> 31 
8b 79 04 89 f0 83 e0 01 85 c0 74 4a 89 fa 89 f0 0f ac d0
[ 1944.444168] EIP: [<c016049d>] unmap_vmas+0x1bd/0xbf0 SS:ESP 0069:ec1a1e4c

-- 
Kernel Ooops using File-backed VBDs
https://bugs.launchpad.net/bugs/184412
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