On Dec 2, 2007, at 9:59 PM, Geoff Levand wrote:
Hi.
I'm finding that recently kexec'ed kernels on PS3 will
panic on startup. It seems the trouble was introduced
with the ppc64 SPARSEMEM_VMEMMAP support. The problem
is the same when starting either new or old kernels:
2.6.24 -> 2.6.23 ok
2.6.24 -> 2.6.23 panic
2.6.24 -> 2.6.24 panic
I'm not sure I completely follow this. What is the difference between
1 and 2 ? Also, you are talking about starting with kexec, but I
don't see how that fits in the failure you have below. In other words,
there may be more than one failure. But I can talk a bit about the
scope of the problem in the current traceback.
These are the commits that seem to introduce the problem:
d29eff7bca60c9ee401d691d4562a4abca8de543 ppc64: SPARSEMEM_VMEMMAP
suppor
8f6aac419bd590f535fb110875a51f7db2b62b5b Generic Virtual Memmap
support for SPARSEMEM
Below is a startup dump. Any help in finding the problem
would be appreciated.
-Geoff
ps3_mm_add_memory:317: start_addr 740320000000h, start_pfn 740320000h,
nr_pages 17000h
<4>swapper: page allocation failure. order:12, mode:0x80d0
Call Trace:
[c000000006047820] [c00000000000e700] .show_stack+0x68/0x1b0
(unreliable)
[c0000000060478c0] [c000000000089eb4] .__alloc_pages+0x358/0x3ac
[c0000000060479b0] [c0000000000a3964] .vmemmap_alloc_block+0x6c/0xf4
[c000000006047a40] [c000000000026544] .vmemmap_populate+0x74/0x100
[c000000006047ae0] [c0000000000a385c]
.sparse_mem_map_populate+0x38/0x5c
[c000000006047b70] [c0000000000a36e4]
.sparse_add_one_section+0x64/0x128
[c000000006047c20] [c0000000000aa74c] .__add_pages+0xac/0x18c
[c000000006047cd0] [c000000000025fd4] .arch_add_memory+0x44/0x60
[c000000006047d60] [c0000000000aa5b0] .add_memory+0xd4/0x124
[c000000006047e00] [c000000000452544] .ps3_mm_add_memory+0x8c/0x108
[c000000006047ea0] [c0000000004417c4] .kernel_init+0x1f4/0x3b8
[c000000006047f90] [c000000000021d88] .kernel_thread+0x4c/0x68
Mem-info:
DMA per-cpu:
CPU 0: Hot: hi: 42, btch: 7 usd: 0 Cold: hi: 14, btch:
3 usd: 0
CPU 1: Hot: hi: 42, btch: 7 usd: 0 Cold: hi: 14, btch:
3 usd: 0
Active:0 inactive:0 dirty:0 writeback:0 unstable:0
free:18094 slab:122 mapped:0 pagetables:0 bounce:0
DMA free:72376kB min:0kB low:0kB high:0kB active:0kB inactive:0kB
present:129280kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 8*4kB 5*8kB 5*16kB 7*32kB 3*64kB 5*128kB 4*256kB 3*512kB 5*1024kB
3*2048kB 4*4096kB 5*8192kB 0*16384kB = 72376kB
Swap cache: add 0, delete 0, find 0/0, race 0+0
Free swap = 0kB
Total swap = 0kB
Free swap: 0kB
32768 pages of RAM
10403 reserved pages
0 pages shared
0 pages swap cached
The kernel is using 16MB pages for the linear mapping and, since its in
the same region, the sparse virtural memmap. PS3 uses hotplug for all
most all of its memory. In this case, its trying to allocate an
additional page to cover a new region of the memory map. However, the
initial 128 MB is fragmented, we have 8 8M chunks but no 16MB ones.
<1>Unable to handle kernel paging request for data at address
0xcf0001960b000010
<1>Faulting instruction address: 0xc000000000087340
Oops: Kernel access of bad area, sig: 11 [#1]
SMP NR_CPUS=2 PS3
Modules linked in:
NIP: c000000000087340 LR: c00000000008733c CTR: 0000000000000000
REGS: c000000006047900 TRAP: 0300 Not tainted
(2.6.24-rc3-ps3-linux-dev-g91428d55-dirty)
MSR: 8000000000008032 <EE,IR,DR> CR: 22004444 XER: 00000000
DAR: cf0001960b000010, DSISR: 0000000042000000
TASK = c000000006041080[1] 'swapper' THREAD: c000000006044000 CPU: 1
<6>GPR00: 0000000000000000 c000000006047b80 c00000000052b410
c000000006001b40
<6>GPR04: 0000000000000001 0000000000000003 0000000000000008
0000000000000000
<6>GPR08: 0000000000000002 cf0001960b000008 c000000006051240
0000000000000003
<6>GPR12: 0000000000000003 c000000000484080 00000000100d0000
0000000000bc5000
<6>GPR16: 0000000007fff000 0000000000000001 00000000100a0000
00000000100d0000
<6>GPR20: 0000000000000000 00000000100df628 00000000100df458
00000000100df678
<6>GPR24: 0000000000740336 c000000000492c00 0000000000000000
0000000000000001
<6>GPR28: 0000000740325000 0000000740324924 c0000000004ce9a8
cf0001960affffe0
NIP [c000000000087340] .memmap_init_zone+0xf0/0x134
LR [c00000000008733c] .memmap_init_zone+0xec/0x134
Call Trace:
[c000000006047b80] [c0000000001da530] .add_memory_block+0xd8/0x108
(unreliable)
[c000000006047c20] [c0000000000aa7ac] .__add_pages+0x10c/0x18c
[c000000006047cd0] [c000000000025fd4] .arch_add_memory+0x44/0x60
[c000000006047d60] [c0000000000aa5b0] .add_memory+0xd4/0x124
[c000000006047e00] [c000000000452544] .ps3_mm_add_memory+0x8c/0x108
[c000000006047ea0] [c0000000004417c4] .kernel_init+0x1f4/0x3b8
[c000000006047f90] [c000000000021d88] .kernel_thread+0x4c/0x68
Instruction dump:
901f000c 38000400 7d20f8a8 7d290378 7d20f9ad 40a2fff4 7ba00521 7fe3fb78
38800002 41820008 4bffff0d 393f0028 <f9290008> f93f0028 3bbd0001
3bff0038
<0>Kernel panic - not syncing: Attempted to kill init!
Instead of detecting the fail and aborting the add, we proceed to
dereference the memory map.
Chris, as you can see, PS3 needs to allocate 1/8th of total initial
memory to add any more memory. Geoff, can you predict what linear
address the additional memory will occupy? Judging from the attempted
address toa add, maybe not. If not, my only thought is to pre-reserve
an additional page and consume it on the first add. Additional adds
will likely draw from the first added region, pinning.
milton
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