Re: [Xen-devel] Another dom0 crash (Unable to handle kernel NULL pointer dereference)

["Christopher S. Aker" <caker@xxxxxxxxxxxx>]

Two more today... This happened immediately after hdparm -t /dev/sda 
completed running in dom0.  It appeared as though the rest of the 
domains remained up, at least for a few moments.
Unable to handle kernel NULL pointer dereference at virtual address 00000028
 printing eip:
c042e60d
0e3f0000 -> *pde = 00000001:f4676001
0b076000 -> *pme = 00000000:00000000
Oops: 0000 [#1]
SMP
Modules linked in:
CPU:    0
EIP:    0061:[<c042e60d>]    Not tainted VLI
EFLAGS: 00210292   (2.6.16-xen0 #1)
EIP is at sock_poll+0x1d/0x30
eax: 00000000   ebx: 00000008   ecx: c75bb600   edx: c6afe3c0
esi: 00400000   edi: 00000036   ebp: 0000000a   esp: cd82bea4
ds: 007b   es: 007b   ss: 0069
Process xenstored (pid: 5099, threadinfo=cd82a000 task=c073a030)
Stack: <0>c75bb600 c6afe3c0 00000000 c75bb600 c017a79a c75bb600 00000000 
c85b88c0
       00000000 c85b88dc c85b88e4 c85b88ec c85b88c8 c85b88d0 c85b88d8 
3fffffff
       00000000 00000000 3fffffff 00000000 00000000 00000000 00000000 
00000304
Call Trace:
 [<c017a79a>] do_select+0x23a/0x4a0
 [<c017a490>] __pollwait+0x0/0xd0
 [<c017b2a6>] core_sys_select+0x1f6/0x2f0
 [<c017b71f>] sys_select+0x4f/0x1d0
 [<c0166bab>] sys_write+0x4b/0x80
 [<c0105141>] syscall_call+0x7/0xb
Code: 00 c3 8d b6 00 00 00 00 8d bf 00 00 00 00 53 83 ec 0c 8b 4c 24 14 
8b 44 24 18 8b 51 78 8b 5a 08 89 44 24 08 89 54 24 04 89 0c 24 <ff> 53 
20 83 c4 0c 5b c3 8d 74 26 00 8d bc 27 00 00 00 00 53 83
<1>Unable to handle kernel NULL pointer dereference at virtual address 
00000014
 printing eip:
c0160dce
0e7bd000 -> *pde = 00000001:f11be001
0e7be000 -> *pme = 00000000:00000000
Oops: 0002 [#2]
SMP
Modules linked in:
CPU:    1
EIP:    0061:[<c0160dce>]    Not tainted VLI
EFLAGS: 00010016   (2.6.16-xen0 #1)
EIP is at free_block+0x6e/0xe0
eax: 00000001   ebx: c6afe040   ecx: c6afe240   edx: 00000010
esi: c0670440   edi: c00e0d40   ebp: 00000000   esp: c00d9ed8
ds: 007b   es: 007b   ss: 0069
Process events/1 (pid: 7, threadinfo=c00d8000 task=cfb6a550)
Stack: <0>0000000b c06161d4 c06161d4 c06161c0 0000000b c00e0d40 c0160ea8 
00000000
       c00f5418 00000000 cfb68a50 c0670440 c00e0d40 c00e0da8 c0160f92 
00000000
       c00d8000 cfb68a50 c067046c 00000004 c00d8000 c121de80 c121de84 
cfb68cc0
Call Trace:
 [<c0160ea8>] drain_array_locked+0x68/0xc0
 [<c0160f92>] cache_reap+0x92/0x1e0
 [<c0130390>] run_workqueue+0x70/0xf0
 [<c0160f00>] cache_reap+0x0/0x1e0
 [<c0130640>] worker_thread+0x120/0x160
 [<c0119e70>] default_wake_function+0x0/0x20
 [<c0133f0f>] kthread+0xff/0x110
 [<c0130520>] worker_thread+0x0/0x160
 [<c0133e10>] kthread+0x0/0x110
 [<c0102cc5>] kernel_thread_helper+0x5/0x10
Code: 00 8b 44 24 04 8b 15 68 64 5e c0 8b 0c a8 8d 81 00 00 00 40 c1 e8 
0c c1 e0 05 8b 5c 10 1c 8b 44 24 1c 8b 13 8b 74 87 30 8b 43 04 <89> 42 
04 89 10 31 d2 2b 4b 0c c7 03 00 01 10 00 c7 43 04 00 02
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