[Xen-devel] experienced unstability

["jon.hart" <jon.hart@xxxxxx>]

Hello,

with xen 3.4.0-rc2-pre and linux-2.6-xen (push2/xen/dom0/master tree) I
experienced an unstability which leads to crashing domUs.

At the moment I'm not sure what causes the processes to crash. One of
the two domU's crash every 24h, some kind of cron initiated remote
access seem to bring this domU down. The other domU crashes after 24-48
hours of uptime.

My first idea was that this has something to do with ram cosumption
because I noticed that the crash never happens  as long as the swap
space is unused.

The hardware consists of an intel core 2 quad (2.8GHz) with 8GB ram
which is alloted as follows:
dom0: 2vcpus 512MB
dumU 1: 4vcpus 2GB
dumU 2: 4vcpus 2GB

If a domU crash happens all I can do is to destroy this guest because it
is unaccessable in this state.

My questions are: is there an other kernel tree I can try? What can I do
to figure out what the problem is or to fix this?


This is a part of what the console spits out if a domU crashes:

Pid: 27918, comm: sh Tainted: G      D    (2.6.29-tip #1)
EIP: 0061:[<c01013a7>] EFLAGS: 00000202 CPU: 2
EIP is at _stext+0x3a7/0x1001
EAX: 00000000 EBX: 00000003 ECX: e190dee4 EDX: 00020010
ESI: 0000001d EDI: e200c3aa EBP: 00000000 ESP: e190dee0
 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0069
CR0: 8005003b CR2: b7f39890 CR3: 0f4c1000 CR4: 00002660
DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
DR6: ffff0ff0 DR7: 00000400
Call Trace:
 [<c0216835>] ? xen_poll_irq+0x4a/0x59
 [<c0105c91>] ? xen_spin_lock_slow+0x7f/0xd5
 [<c0105d57>] ? xen_spin_lock+0x2f/0x58
 [<c02c0197>] ? _spin_lock+0x5/0x7
 [<c0163b95>] ? vma_link+0x22/0x72
 [<c01642a4>] ? mmap_region+0x22f/0x338
 [<c010a47d>] ? sys_mmap2+0x59/0x77
 [<c010720d>] ? syscall_call+0x7/0xb
BUG: soft lockup - CPU#3 stuck for 61s! [nagios:27916]
Modules linked in: ipv6 authenc xfrm4_mode_transport xfrm4_mode_tunnel
xfrm_user xfrm4_tunnel tunnel4 ipcomp xfrm_ipcomp esp4 ah4 deflate
zlib_deflate zlib_inflate twofish twofish_common serpent aes_i586
aes_generic blowfish des_generic cbc sha256_generic sha1_generic
crypto_null af_key pcspkr rtc_core rtc_lib

Pid: 27916, comm: nagios Tainted: G      D    (2.6.29-tip #1)
EIP: 0061:[<c01013a7>] EFLAGS: 00000202 CPU: 3
EIP is at _stext+0x3a7/0x1001
EAX: 00000000 EBX: 00000003 ECX: cf555e94 EDX: 00030016
ESI: 00000023 EDI: e200c3aa EBP: 00000000 ESP: cf555e90
 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0069
CR0: 8005003b CR2: b7c4ee74 CR3: 00380000 CR4: 00002660
DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
DR6: ffff0ff0 DR7: 00000400
Call Trace:
 [<c0216835>] ? xen_poll_irq+0x4a/0x59
 [<c0105c91>] ? xen_spin_lock_slow+0x7f/0xd5
 [<c0105d57>] ? xen_spin_lock+0x2f/0x58
 [<c02c0197>] ? _spin_lock+0x5/0x7
 [<c0163411>] ? unlink_file_vma+0x1d/0x36
 [<c0166b1c>] ? anon_vma_unlink+0x38/0x55
 [<c01617c1>] ? free_pgtables+0x4e/0x76
 [<c01631f3>] ? exit_mmap+0xb8/0x108
 [<c0126dc5>] ? mmput+0x20/0x82
 [<c012a025>] ? exit_mm+0xd7/0xdf
 [<c014777a>] ? acct_collect+0x150/0x155
 [<c012b26c>] ? do_exit+0x14e/0x64e
 [<c012b7d0>] ? do_group_exit+0x64/0x8b
 [<c012b804>] ? sys_exit_group+0xd/0x10
 [<c010720d>] ? syscall_call+0x7/0xb


Greetings
jon



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