Re: Kernel BUG at "arch/xen/x86_64/mm/hypervisor.c":198

["Jan Beulich" <JBeulich@novell.com>]

>From all I can tell this problem will only be fixed with the next SL10 kernel update; I can't, however, tell you when
this can be expected. Jan

>>> Harald Koenig <H.Koenig@science-computing.de> 10.01.06 17:54:22 >>>
Hello Xen developers!

I finally managed to get my first real box for Xen -- and now I'm in trouble ;-)

run Xen-3.0 on an Dual-Opteron Dual-Core box with SUSE 10.0 kernel/xen RPMs 
from current yast online update packages I get the following system crash 
quite easy within a few minutes (~1-5 min) with only dom0 and running 
~4-5 processes with just a cpu loop ("while (1) ;")

here is the most complete information I got from syslog so far:

	kernel: ----------- [cut here ] --------- [please bite here ] ---------
	kernel: Kernel BUG at "arch/xen/x86_64/mm/hypervisor.c":198
	kernel: invalid operand: 0000 [1] 
	kernel: CPU 0 
	kernel: Modules linked in: bridge ipv6 button battery ac af_packet tg3 ohci_hcd usbcore i2c_amd8111 i2c_amd756
i2c_core hw_random generic parport_pc lp parport ext3 jbd dm_mod reiserfs fan thermal processor sg ide_cd cdrom aic79xx
scsi_transport_spi amd74xx sd_mod scsi_mod ide_disk ide_core
	kernel: Pid: 7082, comm: mybuffer Not tainted 2.6.13-15-xen
	kernel: RIP: e030:[<ffffffff8011f987>] <ffffffff8011f987>{xen_pgd_pin+71}
	kernel: RSP: e02b:ffff88000f9b7b28  EFLAGS: 00010282
	kernel: RAX: 00000000ffffffea RBX: ffff88001f08a040 RCX: ffffffff8011f983
	kernel: RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88000f9b7b28
	kernel: RBP: ffff88000f9b7c08 R08: 0000000000000003 R09: 0000000000000000
	kernel: R10: 0000000000007ff0 R11: 0000000000000246 R12: ffff88001d3d0e80
	kernel: R13: ffff8800016d77f0 R14: 000000ae03419fd2 R15: ffff88001a2eb8f8
	kernel: FS:  00002aaaac4001a0(0000) GS:ffffffff804bbe80(0000) knlGS:00000000556ac6c0
	kernel: CS:  e033 DS: 0000 ES: 0000
	kernel: Process mybuffer (pid: 7082, threadinfo ffff88000f9b6000, task ffff88001a2eb6e0)
	kernel: Stack: ffff880000000003 00000000000b5eb6 ffff8800016d77f0 000000ae03419fd2 
	kernel:        ffff88001a2eb8f8 ffffffff8011ea75 ffff88001f08a040 ffffffff80348ddd 
	kernel:        00000000000010da ffff88001a2eb6e0 
	kernel: Call Trace:<ffffffff8011ea75>{mm_pin+325} <ffffffff80348ddd>{schedule+1261}
	kernel:        <ffffffff801572e0>{sync_page+0} <ffffffff803490af>{io_schedule+15}
	kernel:        <ffffffff8015731b>{sync_page+59} <ffffffff80349bb1>{__wait_on_bit_lock+65}
	kernel:        <ffffffff8015740f>{__lock_page+95} <ffffffff801488c0>{wake_bit_function+0}
	kernel:        <ffffffff80157685>{find_get_page+21} <ffffffff80158f5f>{do_generic_mapping_read+479}
	kernel:        <ffffffff80157860>{file_read_actor+0} <ffffffff80159a90>{__generic_file_aio_read+384}
	kernel:        <ffffffff80159c8b>{generic_file_read+187} <ffffffff80156184>{__do_IRQ+244}
	kernel:        <ffffffff80115369>{do_IRQ+57} <ffffffff8010de16>{evtchn_do_upcall+118}
	kernel:        <ffffffff80148760>{autoremove_wake_function+0} <ffffffff8017ace5>{vfs_read+229}
	kernel:        <ffffffff8017b4c3>{sys_read+83} <ffffffff8012101b>{ia32_sysret+0}
	kernel:        <ffffffff80120fa8>{ia32_syscall+0} 
	kernel: 
	kernel: Code: 0f 0b a3 58 81 36 80 ff ff ff ff c2 c6 00 48 83 c4 28 c3 66 
	kernel: RIP <ffffffff8011f987>{xen_pgd_pin+71} RSP <ffff88000f9b7b28>


unfortuneately I didn't yet manage to get the _full_ crash info for both 
the hypervisor _and_ the dom0 kernel in syslog, and I'm still wrestling
with the serial console when using xen.  right now I only have a "real" 
screen shot (4 Mpixel;) which shows both information, if this is needed...

system setup:

	dual-cpu dual-core AMD Opteron 
	8 GB ram
	SUSE 10.0 x86_64 + online update


running 32bit SUSE 10.0 xen-3.0 doesn't show this crash, only the x86_64 system.



which other information do you need ?  
thanks for any pointer & help,

Harald Koenig
-- 
"I hope to die                                      ___       _____
before I *have* to use Microsoft Word.",           0--,|    /OOOOOOO\
Donald E. Knuth, 02-Oct-2001 in Tuebingen.        <_/  /  /OOOOOOOOOOO\
                                                    \  \/OOOOOOOOOOOOOOO\
                                                      \ OOOOOOOOOOOOOOOOO|//
Harald Koenig                                          \/\/\/\/\/\/\/\/\/
science+computing ag                                    //  /     \\  \
koenig@science-computing.de                            ^^^^^       ^^^^^

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