[Xen-devel] Udev oder XEN bug?

[Stephan Seitz <stse+xen@xxxxxxxxxxxxxxxxxxx>]

Hi!

Iâm usingen Debian/Testing with xen-hypervisor-4.0-amd64. Kernel for Dom0 
is 2.6.34 with xen-patches-2.6.34-1.tar.bz2, kernel for DomU is the 
standard 2.6.34.
With all udev version since 153-2, I canât start my DomU. The following 
oops is happening:
<1>1 2010-06-19T10:05:09.833919+02:00 osgiliath kernel - - - [  966.651574] 
BUG: unable to handle kernel NULL pointer dereference at 0000000000000110
<1>1 2010-06-19T10:05:09.833927+02:00 osgiliath kernel - - - [  966.652006] IP: 
[<ffffffff812a1818>] netback_uevent+0x74/0x98
<4>1 2010-06-19T10:05:09.833929+02:00 osgiliath kernel - - - [  966.652006] PGD c7b8a067 PUD d1dff067 PMD 0 
<0>1 2010-06-19T10:05:09.833932+02:00 osgiliath kernel - - - [  966.652006] Oops: 0000 [#1] SMP 
<0>1 2010-06-19T10:05:09.833934+02:00 osgiliath kernel - - - [  966.652006] last sysfs file: /sys/devices/xen-backend/vif-1-1/uevent
<4>1 2010-06-19T10:05:09.833936+02:00 osgiliath kernel - - - [  966.652006] CPU 0 
<4>1 2010-06-19T10:05:09.833945+02:00 osgiliath kernel - - - [  966.652006] Modules linked in: microcode nfsd exportfs nfs lockd auth_rpcgss sunrpc fus
e lrw gf128mul it87 hwmon_vid coretemp joydev saa7134_alsa snd_pcm_oss 
snd_mixer_oss snd_hda_codec_atihdmi tuner tea5767 tda8290 tuner_xc2028 xc5000 td
a9887 tuner_simple tuner_types mt20xx snd_hda_intel tea5761 snd_hda_codec snd_pcm snd_seq_dummy saa7134 snd_seq_oss ir_common snd_seq_midi v4l2_common 
snd_rawmidi videodev snd_seq_midi_event v4l1_compat snd_seq v4l2_compat_ioctl32 videobuf_dma_sg videobuf_core 8250_pnp snd_timer snd_seq_device 8250 ir
_core serial_core tveeprom floppy snd r8169 mii soundcore i2c_i801 
snd_page_alloc
<4>1 2010-06-19T10:05:09.833948+02:00 osgiliath kernel - - - [  966.652006] 
<4>1 2010-06-19T10:05:09.833951+02:00 osgiliath kernel - - - [  966.652006] Pid: 12051, comm: udevd Not tainted 2.6.34-Dom0 #1 EP45-DS3/EP45-DS3
<4>1 2010-06-19T10:05:09.833954+02:00 osgiliath kernel - - - [  966.652006] RIP: 
e030:[<ffffffff812a1818>]  [<ffffffff812a1818>] netback_uevent+0x74/0x
98
<4>1 2010-06-19T10:05:09.833956+02:00 osgiliath kernel - - - [  966.652006] 
RSP: e02b:ffff8800d151dda8  EFLAGS: 00010246
<4>1 2010-06-19T10:05:09.833959+02:00 osgiliath kernel - - - [  966.652006] 
RAX: ffff880001fa2b80 RBX: ffff8800dda72000 RCX: ffffffff812a1815
<4>1 2010-06-19T10:05:09.833961+02:00 osgiliath kernel - - - [  966.652006] 
RDX: ffff880001f9b000 RSI: ffff880005784b30 RDI: ffff8800c5c4e000
<4>1 2010-06-19T10:05:09.833964+02:00 osgiliath kernel - - - [  966.652006] 
RBP: ffff8800d151ddc8 R08: 0000000000000073 R09: 000000000000000a
<4>1 2010-06-19T10:05:09.833966+02:00 osgiliath kernel - - - [  966.652006] 
R10: 00000000ffffffff R11: 00000000ffffffff R12: ffff8800c5c4e000
<4>1 2010-06-19T10:05:09.833969+02:00 osgiliath kernel - - - [  966.652006] 
R13: 0000000000000000 R14: ffff8800ddbea400 R15: ffff8800c7a05000
<4>1 2010-06-19T10:05:09.833972+02:00 osgiliath kernel - - - [  966.671383] FS: 
 00007f3830cac7a0(0000) GS:ffff880001f9b000(0000) knlGS:000000000000000
0
<4>1 2010-06-19T10:05:09.833974+02:00 osgiliath kernel - - - [  966.672401] CS: 
 e033 DS: 0000 ES: 0000 CR0: 000000008005003b
<4>1 2010-06-19T10:05:09.833977+02:00 osgiliath kernel - - - [  966.673157] 
CR2: 0000000000000110 CR3: 00000000c14cc000 CR4: 0000000000002660
<4>1 2010-06-19T10:05:09.833979+02:00 osgiliath kernel - - - [  966.673157] 
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
<4>1 2010-06-19T10:05:09.833982+02:00 osgiliath kernel - - - [  966.673157] 
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
<4>1 2010-06-19T10:05:09.833984+02:00 osgiliath kernel - - - [  966.673157] 
Process udevd (pid: 12051, threadinfo ffff8800d151c000, task ffff8800bfc31e
00)
<0>1 2010-06-19T10:05:09.833986+02:00 osgiliath kernel - - - [  966.673157] 
Stack:
<4>1 2010-06-19T10:05:09.833989+02:00 osgiliath kernel - - - [  966.680349]  
ffff8800dda72048 ffff8800c5c4e000 ffff8800dda72000 ffff8800dda72058
<4>1 2010-06-19T10:05:09.833992+02:00 osgiliath kernel - - - [  966.680349] <0> 
ffff8800d151ddf8 ffffffff812919c8 ffff880001fa39b0 ffff8800dda72048
<4>1 2010-06-19T10:05:09.833994+02:00 osgiliath kernel - - - [  966.680349] <0> 
ffff8800c5c4e000 ffff8800dfc06060 ffff8800d151de28 ffffffff81280939
<0>1 2010-06-19T10:05:09.833996+02:00 osgiliath kernel - - - [  966.680349] 
Call Trace:
<4>1 2010-06-19T10:05:09.833999+02:00 osgiliath kernel - - - [  966.680349]  
[<ffffffff812919c8>] xenbus_uevent_backend+0x86/0x99
<4>1 2010-06-19T10:05:09.834002+02:00 osgiliath kernel - - - [  966.680349]  
[<ffffffff81280939>] dev_uevent+0x102/0x146
<4>1 2010-06-19T10:05:09.834004+02:00 osgiliath kernel - - - [  966.680349]  
[<ffffffff81280a82>] show_uevent+0x8c/0xe1
<4>1 2010-06-19T10:05:09.834007+02:00 osgiliath kernel - - - [  966.680349]  
[<ffffffff812805fb>] dev_attr_show+0x22/0x49
<4>1 2010-06-19T10:05:09.834010+02:00 osgiliath kernel - - - [  966.680349]  
[<ffffffff81074924>] ? __get_free_pages+0x12/0x49
<4>1 2010-06-19T10:05:09.834013+02:00 osgiliath kernel - - - [  966.680349]  
[<ffffffff810ef4a7>] sysfs_read_file+0xac/0x12e
<4>1 2010-06-19T10:05:09.834015+02:00 osgiliath kernel - - - [  966.680349]  
[<ffffffff810a2178>] vfs_read+0xaa/0x14b
<4>1 2010-06-19T10:05:09.834018+02:00 osgiliath kernel - - - [  966.680349]  
[<ffffffff810a22d2>] sys_read+0x45/0x6c
<4>1 2010-06-19T10:05:09.834020+02:00 osgiliath kernel - - - [  966.680349]  
[<ffffffff81004278>] system_call_fastpath+0x16/0x1b
<4>1 2010-06-19T10:05:09.834023+02:00 osgiliath kernel - - - [  966.701922]  
[<ffffffff81004210>] ? system_call+0x0/0x52
<0>1 2010-06-19T10:05:09.834027+02:00 osgiliath kernel - - - [  966.704097] Code: 48 
89 df 31 c0 e8 4d cf fe ff eb 37 48 89 c2 48 c7 c6 52 f7 52 81 4c 89 e7 31 c0 e8 5b 39 ed 
ff 4c 89 f7 e8 81 b7 df ff 4c 89 e7 <49> 8b 95 10 01 00 00 48 c7 c6 5c f7 52 81 31 c0 
45 31 e4 e8 38
<1>1 2010-06-19T10:05:09.834030+02:00 osgiliath kernel - - - [  966.706254] RIP  
[<ffffffff812a1818>] netback_uevent+0x74/0x98
<4>1 2010-06-19T10:05:09.834032+02:00 osgiliath kernel - - - [  966.706254]  RSP 
<ffff8800d151dda8>
<0>1 2010-06-19T10:05:09.834034+02:00 osgiliath kernel - - - [  966.706254] 
CR2: 0000000000000110
<4>1 2010-06-19T10:05:09.834037+02:00 osgiliath kernel - - - [  966.706386] 
---[ end trace cdf4f473842f756c ]---

Going back to 153-2 resolves the problem. Is this a bug in udev or in 
XEN?
Shade and sweet water!

        Stephan

--
| Stephan Seitz             E-Mail: stse@xxxxxxxxxxxxxxxxxxx |
| PGP Public Keys: http://fsing.rootsland.net/~stse/pgp.html |

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