[Xen-devel] Failure booting domU with < 24M

[Jacob Gorm Hansen <jacobg@xxxxxxx>]

hi,

with unstable from yesterday, linux seems to have trouble detecting
how much memory to use, i.e. it detects 24M even if only given 16M by
the domain builder, and then it dies trying to allocate it:

<5>Linux version 2.6.12.6-xenU (jacobg@jacobpad) (gcc version 3.3.6
(Gentoo 3.3.6, ssp-3.3.6-1.0, pie-8.7.8)) #5 Wed Nov 2 17:20:28 CET
2005
<6>BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 0000000001000000 (usable)
<5>24MB LOWMEM available.
<7>On node 0 totalpages: 6144
<7>  DMA zone: 6144 pages, LIFO batch:1
kernel BUG at mm/bootmem.c:213 (__alloc_bootmem_core)!
 [<c02f8cdb>] __alloc_bootmem_core+0x24b/0x3a0
 [<c02f9269>] __alloc_bootmem_node+0x39/0x70
 [<c02f981e>] free_area_init_core+0x2ae/0x370
 [<c026c79d>] _etext+0x0/0x7f863
 [<c02f99ec>] free_area_init+0x2c/0x30
 [<c02f3030>] zone_sizes_init+0x30/0x40
 [<c02f3654>] setup_arch+0x254/0x4b0
 [<c02ec6a7>] start_kernel+0x27/0x1d0
<0>Kernel panic - not syncing: BUG!

This problem is fairly recent, 16M domains worked fine a couple of
weeks ago. arch/xen/i386/kernel/setup.c does not seem to have changed
in any relevant ways.

Jacob

--
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