[Xen-devel] balloon_process backtrace with stable.2.6.32.x and xen 4.0

[M A Young <m.a.young@xxxxxxxxxxxx>]

I was booting a new guest on a low memory i686 machine and got the 
backtrace below, and the xen system froze.
        Michael Young

BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<c0632871>] balloon_process+0x3e5/0x596
*pdpt = 0000000000aab001 *pde = 0000000000000000 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/system/xen_memory/xen_memory0/info/current_kb
Modules linked in: ipt_MASQUERADE iptable_nat nf_nat bridge stp llc nfs lockd 
fscache nfs_acl auth_rpcgss autofs4 sunrpc ipv6 xen_evtchn xenfs uinput 
snd_intel8x0 snd_ac97_codec ac97_bus ppdev snd_seq snd_seq_device parport_pc 
snd_pcm parport e100 mii snd_timer snd soundcore snd_page_alloc iTCO_wdt 
iTCO_vendor_support i2c_i801 i915 drm_kms_helper drm i2c_algo_bit i2c_core 
video output [last unloaded: scsi_wait_scan]
Pid: 9, comm: events/0 Not tainted (2.6.32.13-1.2.104.xendom0.fc12.i686.PAE #1) 
EIP: 0061:[<c0632871>] EFLAGS: 00010046 CPU: 0
EIP is at balloon_process+0x3e5/0x596
EAX: c25c5000 EBX: 000129a6 ECX: c289fdd8 EDX: 00000000
ESI: 00000000 EDI: 0000c15e EBP: dbcb3f6c ESP: dbcb3f08
DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0069
Process events/0 (pid: 9, ti=dbcb2000 task=dbc8f2c0 task.ti=dbcb2000)
Stack:
dbcb3f38 dbcb3f4c c0ab0288 00000000 00000001 ffffc15e 00000000 0000c15e
 000129a6 00000000 00000261 00000000 c0407250 c2990004 c2998b04 c2990004
 c0407247 00000000 00000000 00000000 00000000 00007ff0 c299c460 c09d92dc
Call Trace:
[<c0407250>] ? check_events+0x8/0xc
[<c0407247>] ? xen_restore_fl_direct_end+0x0/0x1
[<c0458d19>] ? worker_thread+0x140/0x1b9
[<c063248c>] ? balloon_process+0x0/0x596
[<c045c7a5>] ? autoremove_wake_function+0x0/0x34
[<c0458bd9>] ? worker_thread+0x0/0x1b9
[<c045c56d>] ? kthread+0x64/0x69
[<c045c509>] ? kthread+0x0/0x69
[<c040ac07>] ? kernel_thread_helper+0x7/0x10
Code: ff 25 ff ff ff 7f 8b 55 c8 39 f8 89 04 95 e0 6e b6 c0 b8 01 00 00 00 0f 44 45 a8 83 ca ff 89 45 a8 89 d8 e8 bd 3d dd ff 8b 55 b4 <8b> 02 c1 e8 1e 69 c0 00 0b 00 00 05 c0 f3 9e c0 2b 80 ec 0a 00 
EIP: [<c0632871>] balloon_process+0x3e5/0x596 SS:ESP 0069:dbcb3f08
CR2: 0000000000000000

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