[Xen-bugs] [Bug 304] New: oops with 4k kernel stack

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=304

           Summary: oops with 4k kernel stack
           Product: Xen
           Version: unstable
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: Guest-OS
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: tedkaz@xxxxxxxxxxxxx


changeset:   7268:2144de6eabcc
tag:         tip
user:        kaf24@xxxxxxxxxxxxxxxxxxxx
date:        Sat Oct  8 14:19:27 2005 +0100
summary:     Make libxenstore thread-safe. It also spawns an internal

Dom0 is a UP Dell Precision 330, P1.7 running CentOS 4.1.

Registering block device major 8
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 00000008
 printing eip:
c0234a4d
*pde = ma 00000000 pa 55555000
Oops: 0002 [#1]
Modules linked in:
CPU:    0
EIP:    0061:[<c0234a4d>]    Not tainted VLI
EFLAGS: 00010286   (2.6.12-xenU)
EIP is at xlbd_get_major_info+0x2f/0xb7
eax: 00000000   ebx: 00000001   ecx: 000009b6   edx: 00000000
esi: c11f2a80   edi: 00000001   ebp: 00000200   esp: c03cce9c
ds: 007b   es: 007b   ss: 0069
Process kxbwatch (pid: 6, threadinfo=c03cc000 task=c03b70a0)
Stack: 00000008 00000001 0000000a 00000801 c0234bbd 00000801 c11f2ae4 c0157cef
       c11f2ae4 c11e110c 00000200 00000801 c11f2a80 00000001 00000200 c0234daf
       00000001 00c00000 00000000 00000801 00000000 00000200 c0044000 00000000
Call Trace:
 [<c0234bbd>] xlvbd_alloc_gendisk+0x25/0x1a4
 [<c0157cef>] bdget+0xdc/0xe1
 [<c0234daf>] xlvbd_add+0x73/0x87
 [<c0234220>] watch_for_status+0xbe/0x11b
 [<c02324a8>] watch_thread+0x104/0x180
 [<c0129f15>] autoremove_wake_function+0x0/0x4b
 [<c0129f15>] autoremove_wake_function+0x0/0x4b
 [<c02323a4>] watch_thread+0x0/0x180
 [<c0129adc>] kthread+0x90/0xba
 [<c0129a4c>] kthread+0x0/0xba
 [<c010690d>] kernel_thread_helper+0x5/0xb
Code: 8b 44 24 14 89 c1 0f b6 d8 c1 f9 08 8d 51 fd 83 fa 58 77 07 ff 24 95 28 d8
 2a c0 ba 13 00 00 00 8b 04 95 80 f9 35 c0 85 c0 74 09 <83> 40 08 01 83 c4 0c 5b
 c3 89 54 24 08 89 5c 24 04 89 0c 24 e8

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