[Xen-users] Xen 3.1.0 / Centos 5.1 / Kernel Bug 1055 - I can reprod. it any time

["Schober Walter" <Walter.Schober@xxxxxxxxx>]

Hi!

8 GB RAM, HP DL360G5, 2 Core2Duo, 3,2GHz, CentOS 5.1, latest update, 2.6.18-53.1.14.el5xen, x86_64

-> PV guest (32 PAE) kernel crashes anytime it seems to use a lot of buffers. It crashes always on a large query to a Postres server, remotely connected via SSH tunnel, using Perl DBD::Pg and postgresql-8.1.11-1.el5_1.1.

I found:
http://lists.xensource.com/archives/html/xen-bugs/2007-10/msg00004.html
http://www.redhat.com/archives/fedora-xen/2007-May/msg00078.html

and some others pointing to Xen Bug 1055. It seems no one followed that up yet. Maybe due to not reproducability?

So if anybody could tell me please, what I should do while crashing my domU, I could provide information for that Bug.

Needless to say, that I'd like to stay on some RPM kernel version. I tried Xen 3.1.0 from xensource, which worked perfectly. Drawback is that it is not working in the CentOS environment w/o major adaptations. And the main reason to go to the CentOS kernel was GFS, which we couldn't make it run on the Xen 3.1.0.

I can reproduce the kernel bug in any other DomU on that HP, but not on my 2GB RAM test machine in the office. Someting related to the 8 GB?

Any hint/help much appreciated ;-)

Cheers
Walter

BUG: unable to handle kernel NULL pointer dereference at virtual address 00000088
 printing eip:
c0456c7d
2cc5f000 -> *pde = 00000001:64188027
2cf7f000 -> *pme = 00000001:633ad067
29d5a000 -> *pte = 00000000:00000000
Oops: 0000 [#1]
SMP
last sysfs file: /block/ram0/range
Modules linked in: ipv6 i2c_dev i2c_core nls_utf8 cifs xennet ib_iser rdma_cm ib_cm iw_cm ib_addr ib_local_sa ib_sa ib_mad ib_core iscsi_tcp libiscsi scsi_transport_iscsi scsi_mod dm_mirror dm_multipath dm_mod parport_pc lp parport pcspkr xenblk ext3 jbd ehci_hcd ohci_hcd uhci_hcd

CPU:    0
EIP:    0061:[<c0456c7d>]    Not tainted VLI
EFLAGS: 00210206   (2.6.18-53.1.14.el5xen #1)
EIP is at __handle_mm_fault+0x271/0x104e
eax: 00000088   ebx: 00000000   ecx: 00000000   edx: f5416000
esi: 00000088   edi: 00000000   ebp: c1000000   esp: ebb98e30
ds: 007b   es: 007b   ss: 0069
Process export.pl (pid: 1831, ti=ebb98000 task=c0fc0550 task.ti=ebb98000)
Stack: 00000000 00000001 0b411a94 ecefe0cc ecec33c0 00000000 00000000 00000000
       00000000 00000000 00000000 ecf7f2d0 00000088 ebb98f28 00004000 003f44d2
       00000040 ebb98f28 00004000 c0406dd2 ebb98e90 00000088 ebb98ec0 c0406dad
Call Trace:
 [<c0406dd2>] do_softirq+0x1c/0xae
 [<c0406dad>] do_IRQ+0xa5/0xae
 [<c059c36c>] sys_recvfrom+0xcf/0x137
 [<c0406dd2>] do_softirq+0x1c/0xae
 [<c0541911>] evtchn_do_upcall+0x64/0x9b
 [<c0405515>] hypervisor_callback+0x3d/0x48
 [<c045961b>] vma_adjust+0x1a9/0x387
 [<c05fe609>] do_page_fault+0x6d5/0xbd8
 [<c0459b81>] vma_merge+0xdb/0x15f
 [<c045a06f>] do_brk+0x13a/0x1dc
 [<c043f6fa>] audit_syscall_exit+0x2b8/0x2d4
 [<c05fdf34>] do_page_fault+0x0/0xbd8
 [<c04054d3>] error_code+0x2b/0x30
 =======================
Code: 89 f0 c1 e0 05 8d 44 05 00 e8 6c bb ff ff 8b 74 24 08 c1 ee 09 81 e6 f8 0f 00 00 01 f0 89 74 24 54 89 44 24 30 0f 84 71 0d 00 00 <8b> 38 8b 68 04 89 bc 24 e0 00 00 00 f6 84 24 e0 00 00 00 81 0f

EIP: [<c0456c7d>] __handle_mm_fault+0x271/0x104e SS:ESP 0069:ebb98e30
 <0>Kernel panic - not syncing: Fatal exception

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