[Fedora-xen] RHEL4 DomU Update Problem

[Chris Lalancette]

Jim Klein wrote:
> 
> Kernel panics (lots of them, all the same):
> kernel BUG at arch/i386/mm/pgtable-xen.c:306!
> invalid operand: 0000 [#1]
> SMP
> Modules linked in: ext3 jbd dm_mod xenblk sd_mod scsi_mod
> CPU:    0
> EIP:    0061:[<c011163a>]    Not tainted VLI
> EFLAGS: 00010282   (2.6.9-55.0.9.ELxenU)
> EIP is at pgd_ctor+0x1d/0x26
> eax: fffffff4   ebx: 00000000   ecx: f5392000   edx: 00000000
> esi: c19fdd80   edi: eca6aaa0   ebp: 00000001   esp: ecb3cd6c
> ds: 007b   es: 007b   ss: 0068
> Process 10-udev.hotplug (pid: 398, threadinfo=ecb3c000 task=ecb2a070)
> Stack: c0141b69 ecb4b000 c19fdd80 00000001 ecb4b000 eca6aaa0 c19fdd80
> c19fde40
>        c0141ceb c19fdd80 eca6aaa0 00000001 c19fdd80 eca6aaa0 ecb4b000
> 00000010
>        00000001 000000d0 c1a1b080 0000000c c19fde08 c19fdd80 c0141eda
> c19fdd80
> Call Trace:
>  [<c0141b69>] cache_init_objs+0x35/0x56
>  [<c0141ceb>] cache_grow+0xfb/0x187
>  [<c0141eda>] cache_alloc_refill+0x163/0x19c
>  [<c01420f5>] kmem_cache_alloc+0x67/0x97
>  [<c0111671>] pgd_alloc+0x17/0x336
>  [<c01199d4>] mm_init+0xd7/0x116
>  [<c01199e4>] mm_init+0xe7/0x116
>  [<c0119c8a>] copy_mm+0xbb/0x396
>  [<c0268f10>] __cond_resched+0x14/0x3c
>  [<c011aa5a>] copy_process+0x6b5/0xb0b
>  [<c011af9d>] do_fork+0x8a/0x16b
>  [<c0107507>] error_code+0x2b/0x30
>  [<c0105d2c>] sys_clone+0x24/0x28
>  [<c010737f>] syscall_call+0x7/0xb
> Code: 74 02 66 a5 a8 01 74 01 a4 5e 5b 5e 5f c3 80 3d 04 07 2f c0 00 75
> 1c 6a 20 6a 00 ff 74 24 0c e8 ce 37 00 00 83 c4 0c 85 c0 74 08 <0f> 0b
> 32 01 b6 31 27 c0 c3 80 3d 04 07 2f c0 00 75 0d c7 44 24
>  <0>Fatal exception: panic in 5 seconds

OK.  This crash is a bug in the 4.5 kernel that I've now fixed.  It should be
fixed when 4.6 comes out.  In the meantime, you probably should be able to work
around this bug by reducing the amount of memory you are assigning to that domain.

Chris Lalancette