xen_blk: can't get major 8 with name sd

xen_blk: can't get major 8 with name sd

[Ted Kaczmarek]

This happens randomly, more often than not the next xm create will
succeed. Don't think kernel config is related as I use almost identical
setup on my UP machine, but I use the work around for dev designations
on all the vm configs. With that setup I get 100% success on creation of
domU's with changeset: 7353:29db5bded574, this changeset would not boot
dom0 on the SMP machine.


Tyan 2462 SMP , FC4 dom0

changeset:   7369:92c6021f23e4
tag:         tip
parent:      7368:7b9547485703
parent:      7367:10c93f58b041
user:        emellor@leeni.uk.xensource.com
date:        Thu Oct 13 10:26:44 2005 +0100
summary:     Merge.



register_blkdev: cannot get major 8 for sd
xen_blk: can't get major 8 with name sd
Unable to handle kernel NULL pointer dereference at virtual address
00000104
 printing eip:
c0254428
*pde = ma 00000000 pa 55555000
Oops: 0002 [#1]
SMP
Modules linked in:
CPU:    0
EIP:    0061:[<c0254428>]    Not tainted VLI
EFLAGS: 00010286   (2.6.12-xenU)
EIP is at blk_start_queue+0x8/0x60
eax: 00000000   ebx: 00000000   ecx: 00000000   edx: fbffc000
esi: c12e0004   edi: c12b2d85   ebp: c119bf9c   esp: c119bf28
ds: 007b   es: 007b   ss: 0069
Process xenwatch (pid: 10, threadinfo=c119a000 task=c006e580)
Stack: c0264862 c12e0000 c0266a8e 00000000 c12e0000 c026759c c12e0000
00000000
       00000802 00000000 00000200 c12e0000 c02f8387 c119bf78 c03056b9
c02f6db2
       c119bf70 00000000 00000200 00080000 00000000 c02674b0 c12b2a60
c119a000
Call Trace:
 [<c0264862>] xenbus_dev_ok+0x32/0x60
 [<c0266a8e>] kick_pending_request_queues+0x1e/0x40
 [<c026759c>] watch_for_status+0xec/0x140
 [<c02674b0>] watch_for_status+0x0/0x140
 [<c0264e77>] xenwatch_thread+0x87/0x140
 [<c01363c0>] autoremove_wake_function+0x0/0x60
 [<c0264df0>] xenwatch_thread+0x0/0x140
 [<c0135ea7>] kthread+0xc7/0xd0
 [<c0135de0>] kthread+0x0/0xd0
 [<c010782d>] kernel_thread_helper+0x5/0x18
Code: 00 00 00 8b 44 24 04 8b 48 60 ff e1 8d b4 26 00 00 00 00 81 44 24
04 a0 00 00 00 e9 e3 26 00 00 8d 76 00 53 83 ec 04 8b 5c 24 0c <f0> 0f
ba b3 04 01 00 00 02 f0 0f ba ab 04 01 00 00 06 19 c0 85
 <6>IP: routing cache hash table of 1024 buckets, 8Kbyte


Going to run tests on same box and changset with Centos 4.1 as well
tomorrow.


Regards,
Ted