[Xen-devel] Crash with 3.0.3 on domain creation

[Jacob Gorm Hansen <jacobg@xxxxxxx>]

hi,

I am trying to find the cause of a crash I am seeing with using my
domain creation tool 'buscreate' from the migrationtools package, and
the just release xen 3.0.3 (sorry for not being able to test this
earlier on, I could not risk hosing my debug machine as I was working
remotely and I don't have remote power cycling hardware).

I first call      xc_domain_create(xc, ACM_DEFAULT_SSID, xen_handle,
&domid);

 then             xc_domain_setmaxmem(xc,domid, maxmem_mb << 10);
                  xc_domain_memory_increase_reservation(xc,domid, mem_mb
<< 8, 0,0,0);

                  rconsole =
xc_evtchn_alloc_unbound(xc,domid,DOMID_SELF);
                  rstore = xc_evtchn_alloc_unbound(xc,domid,DOMID_SELF);

and finally:      xc_linux_build(xc, domid, kernel, ramdisk,
cmdline ,NULL, 0,
                     rstore, &mfn_store, rconsole, &mfn_console)

which prints the following:

Supported features  = { 0000001f }.
Required features   = { 00000000 }.
VIRTUAL MEMORY ARRANGEMENT:
 Loaded kernel:    0xc0100000->0xc029e7cc
 Initial ramdisk:  0xc029f000->0xc058d000
 Phys-Mach map:    0xc058d000
 Start info:       0xc0595000
 Store page:       0xc0596000
 Console page:     0xc0597000
 Page tables:      0xc0598000
 Boot stack:       0xc059b000
 TOTAL:            0xc0000000->0xc0800000
 ENTRY ADDRESS:    0xc0100000

but before the call returns, Xen crashes like this:

(XEN) ----[ Xen-3.0.3-0  x86_32  debug=n  Not tainted ]----
(XEN) CPU:    0
(XEN) EIP:    e008:[<ff11a62d>] arch_do_domctl+0x6d/0xdd0
(XEN) EFLAGS: 00010246   CONTEXT: hypervisor
(XEN) eax: 00000000   ebx: ff1abe50   ecx: ff188080   edx: 00000003
(XEN) esi: ff188080   edi: b7fc75f0   ebp: 00002000   esp: ff1abd8c
(XEN) cr0: 8005003b   cr4: 000006d0   cr3: 18364000   cr2: 00000300
(XEN) ds: e010   es: e010   fs: 0000   gs: 0033   ss: e010   cs: e008
(XEN) Xen stack trace from esp=ff1abd8c:
(XEN)    00000002 00000000 00000000 00000000 00000000 00000000 00000000
00000000
(XEN)    00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000
(XEN)    00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000
(XEN)    00000000 00000000 00000000 00000000 00000000 00000000 00000000
fffffff3
(XEN)    bfcc69c0 b7fc75f0 ceb1c000 ff102fd0 ff1abe50 bfcc69c0 0000008c
00000000
(XEN)    00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000
(XEN)    00000000 00000006 00000003 0afa0002 00002000 00000000 b7f61ff4
b7ea6ac7
(XEN)    08052808 b7eac4ce b7e9b150 b7f624c0 00000000 00000000 b7ea6795
b7f624c0
(XEN)    b7fb3000 b7f63560 b7f63558 b7f63158 00008018 b7f61ff4 00008008
00000076
(XEN)    bfcc6a28 b7f7d60c b7fb43e0 b7fcffd8 b7fb4680 00000001 bfcc6a70
b7fc2119
(XEN)    b7fb4828 00000000 00000001 00000001 00000073 ff1abef4 ff1abef0
fe800034
(XEN)    ffbf8080 000187b3 fc64b8c8 187b3067 fe020164 00000001 fe020164
ff127fd1
(XEN)    00000000 ffbf8080 ff1abfc8 b7eae401 0001805f ffbf8080 187b3067
b7eae3fa
(XEN)    b7eae3fc 187b3067 00000000 ffbf8080 fe020164 ffbf8080 fe020164
ff12835c
(XEN)    ff186024 ff1abfb4 ff10d704 1f413030 00000000 16b0ffff 187b3067
00000000
(XEN)    ff186024 00000000 ff1abfb4 0805a80c 1805f067 0001805f 00000006
ff18b080
(XEN)    08052808 b7fc75f0 ceb1c000 ff1562f1 bfcc69c0 0000f19c b7f7c188
08052808
(XEN)    b7fc75f0 ceb1c000 bfcc69c0 0000f19c b7f7c188 08052808 b7fc75f0
ceb1c000
(XEN)    00000024 000e0006 c0101487 00000061 00000282 ceb1ded0 00000069
0000007b
(XEN)    0000007b 00000000 00000033 00000000 ff18b080
(XEN) Xen call trace:
(XEN)    [<ff11a62d>] arch_do_domctl+0x6d/0xdd0
(XEN)    [<ff102fd0>] do_domctl+0xf0/0xd20
(XEN)    [<ff127fd1>] mod_l1_entry+0x101/0x3b0
(XEN)    [<ff12835c>] do_update_va_mapping+0xdc/0x320
(XEN)    [<ff10d704>] do_multicall+0xc4/0x2a0
(XEN)    [<ff1562f1>] hypercall+0x71/0x78
(XEN)    
(XEN) Pagetable walk from 00000300:
(XEN)  L2[0x000] = 00000000 ffffffff 
(XEN) 
(XEN) ****************************************
(XEN) Panic on CPU 0:
(XEN) CPU0 FATAL PAGE FAULT
(XEN) [error_code=0000]
(XEN) Faulting linear address: 00000300
(XEN) ****************************************
(XEN) 
(XEN) Reboot in five seconds...

I have tried switching xen-3.0.2 compat. mode on and of in dom0 and
domU, but that has zero effect. The guest kernel is a vanilla domU,
compiled from the same xen tree as xen and domU. I have verified that I
am not using stale .so versions or anything like that. xenstored and
xenconsoled are both running. Things worked fine in xen 3.0.2.

Jacob


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