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xen-devel
[Xen-devel] Re: dom0 pvops crash when used as domU kernel
On 01/26/2010 05:50 AM, Ian Jackson wrote:
Is the dom0 pvops kernel supposed to be useable for a PV guest ?
Yep.
If so, it doesn't work on amd64. See attached console output from the
guest.
The host and guest are both xen-unstable x86_64 with the dom0 pvops
kernel. The host and guest operating system are Debian lenny amd64.
The guest is installed with Debian's xen-create-image, which uses
debootstrap on the host to construct the guest's filesystem in an LV
and set it up ready to be booted PV.
The backtrace is strange; sshd doing statfs shouldn't be hitting any
Xen-specific paths. That suggests something else has gone wrong earlier.
The problem occurs during or shortly after save/restore. My test
system did this:
Hm, save/restore got pretty bitrotted for a while. IanC has done a mass
of work on it lately, but its possible there are still some issues. Are
you actually using an AMD processor? They tend to be undertested.
J
LOG executing ssh ... root@xxxxxxxxxxxxx xm list
LOG executing ssh ... root@xxxxxxxxxxxxx xm save one.guest.osstest image
LOG ping 10.80.249.241 down
LOG executing ssh ... root@xxxxxxxxxxxxx xm restore image
LOG ping 10.80.249.241 up
LOG await tcp one.guest.osstest 22: waiting 5s...
LOG await tcp one.guest.osstest 22: ok. (0s)
LOG executing ssh ... root@xxxxxxxxxxxxx echo guest one.guest.osstest:
restored
ssh_exchange_identification: Connection closed by remote host
status 65280 at Osstest.pm line 190.
Ian.
[ 19.662648] Grant tables using version 2 layout.
[ 23.870414] ------------[ cut here ]------------
[ 23.870439] kernel BUG at
/home/osstest/build.1142.build-amd64/xen-unstable/linux-2.6-pvops.git/include/linux/dcache.h:336!
[ 23.870458] invalid opcode: 0000 [#1] SMP
[ 23.870474] last sysfs file: /sys/kernel/uevent_seqnum
[ 23.870485] CPU 0
[ 23.870497] Modules linked in: [last unloaded: scsi_wait_scan]
[ 23.870518] Pid: 1438, comm: sshd Not tainted 2.6.31.6 #1
[ 23.870529] RIP: e030:[<ffffffff81106c70>] [<ffffffff81106c70>]
__follow_mount+0x4f/0x76
[ 23.870555] RSP: e02b:ffff88001ed53c18 EFLAGS: 00010246
[ 23.870566] RAX: 0000000000000000 RBX: ffff88001e84ca00 RCX: 0000000000000002
[ 23.870580] RDX: ffff88001f4826c0 RSI: 0000000000000001 RDI: ffff88001f5ad840
[ 23.870594] RBP: ffff88001ed53c38 R08: 0000000000000000 R09: 0000000000000000
[ 23.870607] R10: 0000000000000007 R11: 0000000000100000 R12: 0000000000000000
[ 23.870620] R13: ffff88001ed53ca8 R14: ffff88001ed53d68 R15: 0000000000000001
[ 23.870638] FS: 00007f0ee1912790(0000) GS:ffffc90000000000(0000)
knlGS:0000000000000000
[ 23.870654] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 23.870666] CR2: 00007f0edf52fca0 CR3: 000000001f146000 CR4: 0000000000002660
[ 23.870680] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 23.870695] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 23.870709] Process sshd (pid: 1438, threadinfo ffff88001ed52000, task
ffff88001edc8f20)
[ 23.870723] Stack:
[ 23.870731] ffff88001ed53d68 ffff88001f5ad840 ffff88001ed53d68
ffff88001ed53ca8
[ 23.870752]<0> ffff88001ed53c88 ffffffff81106de4 ffff88001ed53ca8
ffff88001ed53c98
[ 23.870778]<0> ffff88001e955200 ffff88001ed541ed ffff88001ed53d68
ffff88001ed53ca8
[ 23.870807] Call Trace:
[ 23.870821] [<ffffffff81106de4>] do_lookup+0x61/0x15d
[ 23.870849] [<ffffffff811079fd>] __link_path_walk+0x61a/0x770
[ 23.870866] [<ffffffff81107d9a>] path_walk+0x69/0xd4
[ 23.870881] [<ffffffff811081e5>] do_path_lookup+0x2a/0x86
[ 23.870895] [<ffffffff8110a72f>] user_path_at+0x52/0x8c
[ 23.870910] [<ffffffff810cf02e>] ? unlock_page+0x22/0x26
[ 23.870925] [<ffffffff811001e7>] ? file_free+0x31/0x35
[ 23.870939] [<ffffffff810fe9e4>] sys_statfs+0x29/0x95
[ 23.870954] [<ffffffff8102f0f1>] ? xen_force_evtchn_callback+0xd/0xf
[ 23.870974] [<ffffffff8102f822>] ? check_events+0x12/0x20
[ 23.870989] [<ffffffff8102f80f>] ? xen_restore_fl_direct_end+0x0/0x1
[ 23.871007] [<ffffffff81576dd9>] ? _spin_unlock_irqrestore+0x34/0x36
[ 23.871013] [<ffffffff811ffc5a>] ? __up_read+0x92/0x9c
[ 23.871013] [<ffffffff81084c5b>] ? up_read+0x9/0xb
[ 23.871013] [<ffffffff8157959b>] ? do_page_fault+0x2d5/0x307
[ 23.871013] [<ffffffff81577245>] ? page_fault+0x25/0x30
[ 23.871013] [<ffffffff81033cc2>] system_call_fastpath+0x16/0x1b
[ 23.871013] Code: 45 49 8b 7d 08 e8 78 8d 00 00 45 85 e4 74 09 49 8b 7d 00 e8 97
fe ff ff 49 89 5d 00 48 8b 53 20 48 85 d2 74 0d 8b 02 85 c0 75 04<0f> 0b eb fe
3e ff 02 49 89 55 08 41 bc 01 00 00 00 49 8b 45 08
[ 23.871013] RIP [<ffffffff81106c70>] __follow_mount+0x4f/0x76
[ 23.871013] RSP<ffff88001ed53c18>
[ 23.871013] ---[ end trace d3d7603d6373c307 ]---
[ 23.893521] ------------[ cut here ]------------
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