linux-kernel - [OOPS] RT kernel on PowerPC

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Message-ID: <20080619124634.GA7409@linux.vnet.ibm.com>
Date:	Thu, 19 Jun 2008 18:16:34 +0530
From:	Chirag Jog <chirag@...ux.vnet.ibm.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Dinakar Guniguntala <dino@...ibm.com>,
	Sripathi Kodi <sripathik@...ibm.com>, josht@...ux.vnet.ibm.com,
	nsnix@...cast.net, tony@...eyournoodle.com, linuxppc-dev@...abs.org
Subject: [OOPS] RT kernel on PowerPC

Hi,
    I was trying out the realtime linux kernel 2.6.25.4-rt3 on a powerpc box.
    The kernel booted fine.
    On running the matrix_mult testcase from the real-time testsuite
    in ltp (ltp/testcases/realtime/func), I get the following Oops.
    After the which machine just freezes.
    I tried setting the panic_on_oops but that didn't help strangely.
    Also, attached is the config file

Oops: Kernel access of bad area, sig: 11 [#1]
PREEMPT SMP NR_CPUS=64 NUMA pSeries
Modules linked in: autofs4 hidp rfcomm l2cap bluetooth sunrpc ehea inet_lro iptable_filter ip_tables xt_tcpudp ip6table_filter ip6_tables x_tables ipv6 dm_mirror dm_multipath dm_mod parport_pc lp parport sg sr_mod ibmvscsic scsi_transport_srp sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd
NIP: c000000000050fa0 LR: c000000000053db4 CTR: c00000000005ab98
REGS: c00000009224fe50 TRAP: 0300   Not tainted  (2.6.25.4-rt3)
MSR: 8000000000001032 <ME,IR,DR>  CR: 28000088  XER: 00000000
DAR: c0000180004fc4b0, DSISR: 0000000040000000
TASK = c000000092200ad0[59] 'events/3' THREAD: c000000092250000 CPU: 3
GPR00: c0000000004fc480 c0000000922500d0 c0000000005bca00 c000000092200ad0 
GPR04: 0000000000000002 0000000000000038 0000000000000000 000000000000000f 
GPR08: 0000000000000001 c0000180004fc480 0f0f0f0f0f0f0f0f c0000000004d9a00 
GPR12: 8000000000009032 c0000000004fca80 0000000000000000 c000000000413910 
GPR16: 4000000000c00000 c000000000412108 0000000000000000 0000000000284000 
GPR20: c0000000004cb9b0 00000000010cb9b0 0000000000000000 0000001fdaa40b13 
GPR24: 0000000000000000 000000000000001f c0000000922501d0 0000000000000000 
GPR28: 0000000000000001 c000000092200ad0 c00000000056a680 c000000090b18ad0 
NIP [c000000000050fa0] .__resched_task+0x38/0xfc
LR [c000000000053db4] .try_to_wake_up+0x168/0x200
Call Trace:
Instruction dump:
fbc1fff0 fbe1fff8 ebc2af70 7c7d1b78 f8010010 f821ff71 e81e8008 e97e8000 
e9230008 81290010 79294da4 7d290214 <e8090030> 7c0b002e 7c000074 7800d182 

Disassembling the __resched_task,

Dump of assembler code for function __resched_task:
0xc000000000050f68 <__resched_task+0>:  mflr    r0
0xc000000000050f6c <__resched_task+4>:  std     r29,-24(r1)
0xc000000000050f70 <__resched_task+8>:  std     r30,-16(r1)
0xc000000000050f74 <__resched_task+12>: std     r31,-8(r1)
0xc000000000050f78 <__resched_task+16>: ld      r30,-20624(r2)
0xc000000000050f7c <__resched_task+20>: mr      r29,r3
0xc000000000050f80 <__resched_task+24>: std     r0,16(r1)
0xc000000000050f84 <__resched_task+28>: stdu    r1,-144(r1)
0xc000000000050f88 <__resched_task+32>: ld      r0,-32760(r30)
0xc000000000050f8c <__resched_task+36>: ld      r11,-32768(r30)
0xc000000000050f90 <__resched_task+40>: ld      r9,8(r3)
0xc000000000050f94 <__resched_task+44>: lwz     r9,16(r9)
0xc000000000050f98 <__resched_task+48>: rldicr  r9,r9,9,54
0xc000000000050f9c <__resched_task+52>: add     r9,r9,r0
0xc000000000050fa0 <__resched_task+56>: ld      r0,48(r9) <----
offending instruction 
0xc000000000050fa4 <__resched_task+60>: lwzx    r0,r11,r0
        




-- 
Cheers,
Chirag Jog


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