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Message-ID: <4A783B1F.7000602@in.ibm.com>
Date: Tue, 04 Aug 2009 19:13:59 +0530
From: Sachin Sant <sachinp@...ibm.com>
To: netdev <netdev@...r.kernel.org>
CC: linuxppc-dev@...abs.org, David Miller <davem@...emloft.net>
Subject: 2.6.31-rc5-git2 crash [net/core/flow.c:flow_cache_new_hashrnd]
Forgot to copy netdev in my original message. Forwarding ..
I have a power6 blade [IBM,7998-61X] running 2.6.31-rc5-git2
kernel (a33a052f19a21d727847391c8c1aff3fb221c472). After some
period of inactivity the machine drops into xmon with following
traces.
cpu 0x0: Vector: 700 (Program Check) at [c00000000ffffa90]
pc: c000000000600000: .flow_cache_new_hashrnd+0x3c/0xcc
lr: c0000000000c6038: .run_timer_softirq+0x20c/0x2f4
sp: c00000000ffffd10
msr: 8000000000089032
current = 0xc000000000f58b70
paca = 0xc0000000010b2400
pid = 0, comm = swapper
enter ? for help
[c00000000ffffda0] c0000000000c6038 .run_timer_softirq+0x20c/0x2f4
[c00000000ffffea0] c0000000000be8a0 .__do_softirq+0x174/0x2c8
[c00000000fffff90] c0000000000307b0 .call_do_softirq+0x14/0x24
[c000000001013870] c00000000000ecf8 .do_softirq+0xa0/0x104
[c000000001013910] c0000000000be1d0 .irq_exit+0x74/0xd4
[c000000001013990] c00000000002ce20 .timer_interrupt+0x1cc/0x200
[c000000001013a30] c000000000003728 decrementer_common+0x128/0x180
--- Exception: 901 (Decrementer) at c00000000000ec3c .raw_local_irq_restore+0xc0/0xdc
[c000000001013dc0] c000000000015824 .cpu_idle+0x13c/0x1e0
[c000000001013e60] c000000000009fe8 .rest_init+0x94/0xcc
[c000000001013ee0] c000000000990cf4 .start_kernel+0x484/0x4a8
[c000000001013f90] c000000000008408 .start_here_common+0x2c/0xa4
0:mon> di $.flow_cache_new_hashrnd
c0000000005fffc4 7c0802a6 mflr r0
c0000000005fffc8 f8010010 std r0,16(r1)
c0000000005fffcc fb81ffe0 std r28,-32(r1)
c0000000005fffd0 fba1ffe8 std r29,-24(r1)
c0000000005fffd4 fbc1fff0 std r30,-16(r1)
c0000000005fffd8 fbe1fff8 std r31,-8(r1)
c0000000005fffdc f821ff71 stdu r1,-144(r1)
c0000000005fffe0 7c3f0b78 mr r31,r1
c0000000005fffe4 ebc2dc90 ld r30,-9072(r2)
c0000000005fffe8 3b800001 li r28,1
c0000000005fffec 60000000 nop
...
c0000000005ffff4 e93e8048 ld r9,-32696(r30)
c0000000005ffff8 38a0ffff li r5,-1
c0000000005ffffc eba90000 ld r29,0(r9)
c000000000600000 00001010 .long 0x1010
0:mon>
c000000000600004 00000008 .long 0x8
c000000000600008 00001013 .long 0x1013
c00000000060000c 0000000f .long 0xf
c000000000600010 7961626f rldimi. r1,r11,44,41
c000000000600014 6f740000 xoris r20,r27,0
c000000000600018 00101600 .long 0x101600
c00000000060001c 00000c00 .long 0xc00
c000000000600020 00000400 .long 0x400
c000000000600024 00101100 .long 0x101100
c000000000600028 000008e9 .long 0x8e9
c00000000060002c 60000000 nop
c000000000600030 e93e8050 ld r9,-32688(r30)
c000000000600034 7c6507b4 extsw r5,r3
c000000000600038 78ab4da4 rldicr r11,r5,9,54
c00000000060003c 396b0040 addi r11,r11,64
c000000000600040 80090000 lwz r0,0(r9)
0:mon> r
R00 = c0000000000c6038 R16 = 0000000000000000
R01 = c00000000ffffd10 R17 = 0000000000000100
R02 = c000000001011110 R18 = c000000001059300
R03 = 0000000000000000 R19 = c000000001102f98
R04 = c00000000ffffd60 R20 = c000000001103398
R05 = ffffffffffffffff R21 = c000000001103798
R06 = 00000000000006d0 R22 = c000000001103b98
R07 = 0000000000000001 R23 = 0000000000000000
R08 = 0000000000830000 R24 = c00000000fffc000
R09 = c00000000072f890 R25 = 0000000000000000
R10 = c00000000120fbf8 R26 = 0000000000200200
R11 = c000000000600090 R27 = c00000000ffffe10
R12 = 0000000028000022 R28 = 0000000000000001
R13 = c0000000010b2400 R29 = c0000000010805e8
R14 = 0000000000382800 R30 = c000000000fb4f78
R15 = 0000000000000000 R31 = c00000000ffffd10
pc = c000000000600000 .flow_cache_new_hashrnd+0x3c/0xcc
lr = c0000000000c6038 .run_timer_softirq+0x20c/0x2f4
msr = 8000000000089032 cr = 28000024
ctr = c0000000005fffc4 xer = 0000000000000000 trap = 700
0:xmon>
This is a 8 cpu system. Other cpu's are in idle state. Last
vanilla kernel that worked fine was 2.6.31-rc4-git2
(4733fd328f14280900435d9dbae1487d110a4d56).
dmesg log and .config attached.
Thanks
-Sachin
--
---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------
View attachment "rc5-git2-log" of type "text/plain" (19467 bytes)
View attachment "config_rc5-git2" of type "text/plain" (86702 bytes)
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