[Xen-users] domU crashes when given 4g or more of ram

[Phil Susi <psusi@xxxxxxxxxx>]

I have a domU that has been running just fine for the last year with 
2048m of ram.  I changed the config to give it 4096m of ram, and now 
when I start it up, it crashes without any output to the console at all. 
 It doesn't even make it to the grub loader screen.  What could be the 
cause?  It might be worth mentioning that the host is 64 bit but the 
guest is only 32 bit.
My cfg is:

name="devserv"
memory=3000
disk = [ '/dev/hyper1/devserv,,xvda' ]
vcpus="8"
kernel = "/home/psusi/core.elf"
vif = [ '' ]
on_crash = "preserve"

And I also noticed that xl dmesg shows this:

(XEN) d4:v0: unhandled page fault (ec=0002)
(XEN) Pagetable walk from 00000000ff7f4fff:
(XEN)  L4[0x000] = 0000000067289027 00000000000ff7f5
(XEN)  L3[0x003] = 0000000067285007 00000000000ff7f9
(XEN)  L2[0x1fb] = 0000000000000000 ffffffffffffffff
(XEN) domain_crash_sync called from entry.S: fault at ffff82d08021abf0 
compat_create_bounce_frame+0xc6/0xde
(XEN) Domain 4 (vcpu#0) crashed on cpu#7:
(XEN) ----[ Xen-4.4.1  x86_64  debug=n  Not tainted ]----
(XEN) CPU:    7
(XEN) RIP:    e019:[<0000000000006f4c>]
(XEN) RFLAGS: 0000000000000287   EM: 1   CONTEXT: pv guest
(XEN) rax: 00000000ff7f4000   rbx: 00000000fffff000   rcx: 0000000000000fff
(XEN) rdx: 000000000092b000   rsi: 00000000ff7f5000   rdi: 00000000ff7f4000
(XEN) rbp: 000000000040ae38   rsp: 000000000040ae18   r8:  ffff830827060000
(XEN) r9:  ffffffffffff8000   r10: ffff83083f110000   r11: ffff83083f110000
(XEN) r12: ffff830827078068   r13: 00000073b55351c8   r14: ffff830827078060
(XEN) r15: ffff82d0802e2620   cr0: 000000008005003b   cr4: 00000000001526f0
(XEN) cr3: 000000083f94d000   cr2: 00000000ff7f4fff
(XEN) ds: e021   es: e021   fs: e021   gs: e021   ss: e021   cs: e019
(XEN) Guest stack trace from esp=0040ae18:
(XEN)   00000002 00006f4c 0001e019 00010087 fffff000 00000000 ff7f4000 
00000000
(XEN)   0040afb8 0000113c 00000000 00000000 00000008 3f8b8007 00100000 
00000000
(XEN)   00100000 00000000 000ff7fa 00000000 00000000 00000000 0000092e 
00000000
(XEN)   00000000 00000000 000ff7f5 00000000 00000800 00000000 00000937 
00000000
(XEN)   00000000 00449000 000ff7fa 00000000 00000937 00000000 00000800 
00000000
(XEN)   00100000 000001ff 00000000 00000000 00000001 00000000 00007ff0 
00000001
(XEN)   00000000 0040c000 00000800 00000000 00000004 00000000 00000001 
00000000
(XEN)   00000000 00000002 00067289 00000000 00000005 00067289 00000000 
00000004
(XEN)   0072f68b 00000000 66a83001 00000000 0000092c 00000000 2f68d001 
00000007
(XEN)   000ffffb 00000000 66a84001 00000000 0000092d 00000000 2f68c001 
00000007
(XEN)   000ffffa 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 0092b000 
00000000
(XEN)   0040aff8 00006b10 00000000 00000000 00000000 00000000 00000000 
00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 0092b000 
00000000
(XEN)   00000000 00000011 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 
00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
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