[Unionfs] sporadic oops during diskless boot

[Hans-Peter Jansen]

Hi,

during diskless boot on module load, I harvest _sporadic_ oopses
like this one with unionfs snapshot 20060221-0341:

Unable to handle kernel NULL pointer dereference at virtual address 00000008
 printing eip:
f9033c9b
*pde = 00000000
Oops: 0000 [#1]
Modules linked in: via_agp agpgart via_ircc irda crc_ccitt via82cxxx ide_core
 ehci_hcd snd_via82xx gameport snd_ac97_codec snd_pcm snd_timer snd_page_alloc
 snd_mpu401_uart snd_rawmidi snd_seq_device snd soundcore ohci1394 ieee1394 
 uhci_hcd usbcore unionfs af_packet 3c59x via_rhine 8139
too mii e1000
CPU:    0
EIP:    0060:[<f9033c9b>]    Tainted: G     U VLI
EFLAGS: 00010202   (2.6.11.4-21.12.lisa.1-default) 
EIP is at unionfs_link+0x27b/0x880 [unionfs]
eax: f7200a60   ebx: f7c64294   ecx: 00000000   edx: 00000000
esi: f72096c8   edi: 00000000   ebp: f728adbc   esp: f74b3ec4
ds: 007b   es: 007b   ss: 0068
Process blkid (pid: 4136, threadinfo=f74b2000 task=f7860560)
Stack: 00000000 f9035430 00000003 00000000 f7c79c48 f7c26b40 00000002 0000004d 
       f7258f40 f728af30 f728adbc 00000000 f728aecc f7c79c74 f71e7a04 f9044840 
       f9033a20 f7c79c74 f71e7a04 c015f860 f728aecc f728aecc f7f1e000 f74b3f70 
Call Trace:
 [<f9035430>] unionfs_permission+0x1b0/0x2c0 [unionfs]
 [<f9033a20>] unionfs_link+0x0/0x880 [unionfs]
 [<c015f860>] vfs_link+0xe0/0x1b0
 [<c015f9f1>] sys_link+0xc1/0xf0
 [<c0116537>] recalc_task_prio+0x127/0x280
 [<c015f4e6>] sys_unlink+0xe6/0x130
 [<c0102ca7>] syscall_call+0x7/0xb
Code: ff 85 c9 0f 88 b4 05 00 00 8b 54 24 38 8b 42 44 8b 80 60 01 00 00 8b 50 18 
89 c8 c1 e0 04 f6 44 02 0c 02 74 15 8b 46 24 8b 14 88 <8b> 72 
08 8b 96 94 00 00 00 f6 42 34 01 74 05 bf e2 ff ff ff 85 
 
Should I simply file a bugzilla issue report, or does it ring
somebodies bell?

Cheers,
Pete