linux-kernel - Re: crash in kmem_cache

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Date:	Tue, 22 Jan 2008 22:45:05 +0100
From:	Olaf Hering <olaf@...fle.de>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Christoph Lameter <clameter@....com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	hanth Aravamudan <nacc@...ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	lee.schermerhorn@...com, Linux MM <linux-mm@...ck.org>,
	akpm@...ux-foundation.org
Subject: Re: crash in kmem_cache_init

On Tue, Jan 22, Mel Gorman wrote:

> http://www.csn.ul.ie/~mel/postings/slab-20080122/partial-revert-slab-changes.patch
> .. Can you please check on your machine if it fixes your problem?

It does not fix or change the nature of the crash.

> Olaf, please confirm whether you need the patch below as well as the
> revert to make your machine boot.

It crashes now in a different way if the patch below is applied:

Linux version 2.6.24-rc8-ppc64 (olaf@...gonberry) (gcc version 4.1.2 20070115 (prerelease) (SUSE Linux)) #43 SMP Tue Jan 22 22:39:05 CET 2008
[boot]0012 Setup Arch
EEH: PCI Enhanced I/O Error Handling Enabled
PPC64 nvram contains 8192 bytes
Zone PFN ranges:
  DMA             0 ->   892928
  Normal     892928 ->   892928
Movable zone start PFN for each node
early_node_map[1] active PFN ranges
    1:        0 ->   892928
Could not find start_pfn for node 0
[boot]0015 Setup Done
Built 2 zonelists in Node order, mobility grouping on.  Total pages: 880720
Policy zone: DMA
Kernel command line: debug xmon=on panic=1  
[boot]0020 XICS Init
xics: no ISA interrupt controller
[boot]0021 XICS Done
PID hash table entries: 4096 (order: 12, 32768 bytes)
time_init: decrementer frequency = 275.070000 MHz
time_init: processor frequency   = 2197.800000 MHz
clocksource: timebase mult[e8ab05] shift[22] registered
clockevent: decrementer mult[466a] shift[16] cpu[0]
Console: colour dummy device 80x25
console handover: boot [udbg-1] -> real [hvc0]
Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes)
Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes)
freeing bootmem node 1
Memory: 3496632k/3571712k available (6188k kernel code, 75080k reserved, 1324k data, 1220k bss, 304k init)
Unable to handle kernel paging request for data at address 0x00000058
Faulting instruction address: 0xc0000000000fe018
cpu 0x0: Vector: 300 (Data Access) at [c00000000075bac0]
    pc: c0000000000fe018: .setup_cpu_cache+0x184/0x1f4
    lr: c0000000000fdfa8: .setup_cpu_cache+0x114/0x1f4
    sp: c00000000075bd40
   msr: 8000000000009032
   dar: 58
 dsisr: 42000000
  current = 0xc000000000665a50
  paca    = 0xc000000000666380
    pid   = 0, comm = swapper
enter ? for help
[c00000000075bd40] c0000000000fb368 .kmem_cache_create+0x3c0/0x478 (unreliable)
[c00000000075be20] c0000000005e6780 .kmem_cache_init+0x284/0x4f4
[c00000000075bee0] c0000000005bf8ec .start_kernel+0x2f8/0x3fc
[c00000000075bf90] c000000000008590 .start_here_common+0x60/0xd0
0:mon> 

0xc0000000000fe018 is in setup_cpu_cache (/home/olaf/kernel/git/linux-2.6-numa/mm/slab.c:2111).
2106                                    BUG_ON(!cachep->nodelists[node]);
2107                                    kmem_list3_init(cachep->nodelists[node]);
2108                            }
2109                    }
2110            }
2111            cachep->nodelists[numa_node_id()]->next_reap =
2112                            jiffies + REAPTIMEOUT_LIST3 +
2113                            ((unsigned long)cachep) % REAPTIMEOUT_LIST3;
2114
2115            cpu_cache_get(cachep)->avail = 0;

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