[Xen-devel] dom0 pvops crash when used as domU kernel

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Is the dom0 pvops kernel supposed to be useable for a PV guest ?
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 problem occurs during or shortly after save/restore.  My test
system did this:

 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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