[Xen-bugs] [Bug 903] New: Xen Guest fails to boot when physical memory is not limited to less than 4 GB.

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=903

           Summary: Xen Guest fails to boot when physical memory is not
                    limited to less than 4 GB.
           Product: Xen
           Version: unstable
          Platform: x86
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: hawklan@xxxxxxxxxxx


I am using Xen 3.0.3 on Fedora Core 6 32-bit.
The hardware is a Dell PowerEdge 2950, Xeon 5110 dual-processor, dual-core with
8GB of RAM.

If I limit the memory available using mem=4000M in grub.conf, the guest OS will
boot without a problem.  If I use more than 4GB of RAM, the guest OS will not
boot up.  This is 100% reproducable, and has been verified with numberous guest
OS images, although all of the guest images are Fedora Core 6 based and
constucted with xenguest-install and virt-install on the Dom0.

The information provided by the guest OS follows:

------------[ cut here ]------------
kernel BUG at arch/i386/mm/hypervisor.c:70!
invalid opcode: 0000 [#1]
SMP 
last sysfs file: /block/ram0/dev
Modules linked in: dm_snapshot dm_zero dm_mirror dm_mod xenblk ext3 jbd
ehci_hcd ohci_hcd uhci_hcd
CPU:    0
EIP:    0061:[<c0414625>]    Not tainted VLI
EFLAGS: 00010282   (2.6.18-1.2798.fc6xen #1) 
EIP is at xen_l2_entry_update+0x7c/0x8b
eax: ffffffea   ebx: c0920d10   ecx: 00000001   edx: 00000000
esi: 00007ff0   edi: 00000000   ebp: 00000aed   esp: c0920d08
ds: 007b   es: 007b   ss: 0069
Process lvm (pid: 248, ti=c0920000 task=c0923870 task.ti=c0920000)
Stack: c7d84067 00000000 170c9df8 00000002 c7d84067 00000000 00000000 c7d84067 
       00000000 c045356c ffffffff ffffffff c09a8df8 c0764840 00000061 80000000 
       000009a8 00000000 00000000 00000001 c04537ad c115d365 c0cf6f40 00000063 
Call Trace:
 [<c045356c>] __pte_alloc+0x1a2/0x21d
 [<c04537ad>] __handle_mm_fault+0x1c6/0x10bf
 [<c060a17f>] do_page_fault+0x6f6/0xc3c
 [<c040502b>] error_code+0x2b/0x30
DWARF2 unwinder stuck at error_code+0x2b/0x30

Leftover inexact backtrace:

 [<c041007b>] do_sys_vm86+0x26d/0x38b
 [<c04df660>] __copy_to_user_ll+0xcf/0xda
 [<c0482119>] seq_read+0x1e4/0x277
 [<c0481f35>] seq_read+0x0/0x277
 [<c04665ec>] vfs_read+0xa6/0x157
 [<c0466a5b>] sys_read+0x41/0x67
 [<c0404ea7>] syscall_call+0x7/0xb
 =======================
Code: 01 00 00 00 89 44 24 0c 8b 04 24 8d 5c 24 08 89 74 24 08 be f0 7f 00 00
89 54 24 14 31 d2 89 44 24 10 e8 ff c9 fe ff 85 c0 79 08 <0f> 0b 46 00 58 41 62
c0 83 c4 18 5b 5e 5f c3 57 05 00 00 00 40 
EIP: [<c0414625>] xen_l2_entry_update+0x7c/0x8b SS:ESP 0069:c0920d08
 <3>BUG: soft lockup detected on CPU#0!
 [<c040571a>] dump_trace+0x69/0x1af
 [<c0405878>] show_trace_log_lvl+0x18/0x2c
 [<c0405e18>] show_trace+0xf/0x11
 [<c0405e47>] dump_stack+0x15/0x17
 [<c0441961>] softlockup_tick+0xad/0xc4
 [<c0409290>] timer_interrupt+0x54b/0x593
 [<c0441be6>] handle_IRQ_event+0x27/0x51
 [<c0441ca6>] __do_IRQ+0x96/0xf2
 [<c0406ca8>] do_IRQ+0x9e/0xbc
 =======================
BUG: spinlock lockup on CPU#0, lvm/248, c0764894 (Not tainted)
 [<c040571a>] dump_trace+0x69/0x1af
 [<c0405878>] show_trace_log_lvl+0x18/0x2c
 [<c0405e18>] show_trace+0xf/0x11
 [<c0405e47>] dump_stack+0x15/0x17
 [<c04e04a7>] _raw_spin_lock+0xbf/0xdc
 [<c041195d>] mm_unpin+0x17/0x2b
 [<c0411adc>] _arch_exit_mmap+0x16b/0x173
 [<c0457436>] exit_mmap+0x1c/0xf6
 [<c041a441>] mmput+0x34/0x7a
 [<c041ee6d>] do_exit+0x20b/0x776
 [<c0405db9>] die+0x289/0x2ae
 [<c04063c2>] do_invalid_op+0xa2/0xab
 [<c040502b>] error_code+0x2b/0x30
DWARF2 unwinder stuck at error_code+0x2b/0x30

Leftover inexact backtrace:

 [<c0414625>] xen_l2_entry_update+0x7c/0x8b
 [<c045356c>] __pte_alloc+0x1a2/0x21d
 [<c04537ad>] __handle_mm_fault+0x1c6/0x10bf
 [<c0608c2a>] _read_unlock_irq+0x5/0xa
 [<c044722f>] find_get_page+0x36/0x3b
 [<c0449d44>] filemap_nopage+0x19a/0x33e
 [<c060a17f>] do_page_fault+0x6f6/0xc3c
 [<c04b714a>] avc_has_perm+0x4e/0x58
 [<c04b77cb>] inode_has_perm+0x5b/0x63
 [<c047a3be>] __d_path+0xc5/0x156
 [<c0609a89>] do_page_fault+0x0/0xc3c
 [<c040502b>] error_code+0x2b/0x30
 [<c041007b>] do_sys_vm86+0x26d/0x38b
 [<c04df660>] __copy_to_user_ll+0xcf/0xda
 [<c0482119>] seq_read+0x1e4/0x277
 [<c0481f35>] seq_read+0x0/0x277
 [<c04665ec>] vfs_read+0xa6/0x157
 [<c0466a5b>] sys_read+0x41/0x67
 [<c0404ea7>] syscall_call+0x7/0xb
 =======================


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