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From: Jörg Sommer on 6 Aug 2010 20:40
Hi,

I've built my 2.6.35 with tracing support and now, I'm getting
continuously oops'. It seems to happen on high process activity.

[ 52.336371] device eth0 entered promiscuous mode
[ 52.347616] device eth0 left promiscuous mode
[ 55.240663] Unable to handle kernel paging request for data at address 0xbfaf4a24
[ 55.248289] Faulting instruction address: 0xc00aad98
[ 55.255562] Oops: Kernel access of bad area, sig: 11 [#1]
[ 55.262588] PowerMac
[ 55.269606] last sysfs file: /sys/devices/pci0000:00/0000:00:10.0/graphics/fb0/radeonbl0/brightness
[ 55.277111] Modules linked in: fuse snd_powermac option usb_wwan usbserial ecb b43 snd_aoa_i2sbus snd_pcm_oss
[ 55.302368] NIP: c00aad98 LR: c001771c CTR: c003dba0
[ 55.310738] REGS: e3211e70 TRAP: 0300 Not tainted (2.6.35)
[ 55.319122] MSR: 00001032 <ME,IR,DR> CR: 22f88f42 XER: 20000000
[ 55.327650] DAR: bfaf4a24, DSISR: 40000000
[ 55.335954] TASK = e3245bc0[1929] 'sh' THREAD: e3210000
[ 55.336144] GPR00: 00000000 e3211f20 e3245bc0 e3245bc0 c000b944 00000000 003a1040 00000000
[ 55.344859] GPR08: bfaf4a20 c05e0000 c0614d18 c0610000 00000000 10033368 10018520 10007c2c
[ 55.353723] GPR16: 10007c30 00000000 00000000 00000000 bfecaa10 101d8304 10019c28 bfecbfab
[ 55.362438] GPR24: bfecaa08 10019c58 000006d1 00000000 c063be80 bfeca9a0 0ffebff4 e3211f20
[ 55.378913] NIP [c00aad98] trace_hardirqs_on+0x5c/0x124
[ 55.386856] LR [c001771c] restore+0x10/0x6c
[ 55.394527] Call Trace:
[ 55.401878] [e3211f20] [10019c58] 0x10019c58 (unreliable)
[ 55.409437] [e3211f40] [c001771c] restore+0x10/0x6c
[ 55.417065] --- Exception: c00 at 0xff23c88
[ 55.417071] LR = 0xff23c54
[ 55.432267] Instruction dump:
[ 55.439808] 800a005c 70090002 418200c8 7c0000a6 70008000 408200bc 3d20c05e 838a0058
[ 55.447730] 81096f98 2f880000 811f0000 81080000 <83680004> 41be009c 816b4d18 90096f98
[ 55.455722] ---[ end trace 547f1189532873f7 ]---
[ 390.022834] EXT4-fs (dm-0): mounted filesystem with ordered data mode. Opts: (null)

[ 507.793120] lo: Disabled Privacy Extensions
[ 518.228969] eth0: no IPv6 routers present
[ 737.593898] Unable to handle kernel paging request for data at address 0x00000004
[ 737.593927] Faulting instruction address: 0xc00aad98
[ 737.593957] Oops: Kernel access of bad area, sig: 11 [#2]
[ 737.593967] PowerMac
[ 737.593976] last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
[ 737.593992] Modules linked in: ppp_async crc_ccitt ipv6 ppp_generic slhc fuse snd_powermac option usb_wwan usb
[ 737.594132] NIP: c00aad98 LR: c001771c CTR: c003dba0
[ 737.594148] REGS: e685de70 TRAP: 0300 Tainted: G D (2.6.35)
[ 737.594159] MSR: 00001032 <ME,IR,DR> CR: 24000042 XER: 20000000
[ 737.594187] DAR: 00000004, DSISR: 40000000
[ 737.594198] TASK = e30b3780[3322] 'zsh-beta' THREAD: e685c000
[ 737.594208] GPR00: 00000000 e685df20 e30b3780 e30b3780 c000b944 00000000 003e5f00 00000000
[ 737.594240] GPR08: 00000000 c05e0000 c0614d18 c0610000 00000000 100b4ee8 10092dec 00000000
[ 737.594271] GPR16: 100bb400 100916fc 00000000 bfbda1b0 bfbda4ec 00000000 00000000 00000000
[ 737.594303] GPR24: 100b0000 100bae50 00000cea 00000000 c063be80 bfbd9e60 0fe64ff4 e685df20
[ 737.594362] NIP [c00aad98] trace_hardirqs_on+0x5c/0x124
[ 737.594379] LR [c001771c] restore+0x10/0x6c
[ 737.594388] Call Trace:
[ 737.594402] [e685df20] [100bae50] 0x100bae50 (unreliable)
[ 737.594421] [e685df40] [c001771c] restore+0x10/0x6c
[ 737.594432] Instruction dump:
[ 737.594442] 800a005c 70090002 418200c8 7c0000a6 70008000 408200bc 3d20c05e 838a0058
[ 737.594473] 81096f98 2f880000 811f0000 81080000 <83680004> 41be009c 816b4d18 90096f98
[ 737.594514] ---[ end trace 547f1189532873f8 ]---
[ 737.919108] Unable to handle kernel paging request for data at address 0x00000003
[ 737.919137] Faulting instruction address: 0xc00aad98
[ 737.919168] Oops: Kernel access of bad area, sig: 11 [#3]
[ 737.919179] PowerMac
[ 737.919187] last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
[ 737.919203] Modules linked in: ppp_async crc_ccitt ipv6 ppp_generic slhc fuse snd_powermac option usb_wwan usb
[ 737.919342] NIP: c00aad98 LR: c001771c CTR: 00000000
[ 737.919358] REGS: e6d15e70 TRAP: 0300 Tainted: G D (2.6.35)
[ 737.919369] MSR: 00001032 <ME,IR,DR> CR: 24ffff42 XER: 00000000
[ 737.919397] DAR: 00000003, DSISR: 40000000
[ 737.919409] TASK = e30b3780[3350] 'zsh-beta' THREAD: e6d14000
[ 737.919419] GPR00: 00000000 e6d15f20 e30b3780 e30b3780 c000b944 00000000 0065df00 00000008
[ 737.919451] GPR08: ffffffff c05e0000 c0614d18 c0610000 ffffffff 100b4ee8 100ad1e8 00000004
[ 737.919483] GPR16: 100bb400 100916fc 00000000 bfbdad70 bfbdb0a8 10091e04 10091e08 100ad314
[ 737.919515] GPR24: 100b0000 100bae50 00000cea 00000000 c063be80 bfbdaa20 0fe64ff4 e6d15f20
[ 737.919576] NIP [c00aad98] trace_hardirqs_on+0x5c/0x124
[ 737.919593] LR [c001771c] restore+0x10/0x6c
[ 737.919602] Call Trace:
[ 737.919616] [e6d15f20] [100bae50] 0x100bae50 (unreliable)
[ 737.919635] [e6d15f40] [c001771c] restore+0x10/0x6c
[ 737.919646] Instruction dump:
[ 737.919657] 800a005c 70090002 418200c8 7c0000a6 70008000 408200bc 3d20c05e 838a0058
[ 737.919688] 81096f98 2f880000 811f0000 81080000 <83680004> 41be009c 816b4d18 90096f98
[ 737.919728] ---[ end trace 547f1189532873f9 ]---

% uname -a
Linux ibook 2.6.35 #33 Fri Aug 6 21:44:01 CEST 2010 ppc GNU/Linux

% cat /proc/cpuinfo
processor : 0
cpu : 7455, altivec supported
clock : 606.000000MHz
revision : 3.3 (pvr 8001 0303)
bogomips : 36.86
timebase : 18432000
platform : PowerMac
model : PowerBook6,3
machine : PowerBook6,3
motherboard : PowerBook6,3 MacRISC3 Power Macintosh
detected as : 287 (iBook G4)
pmac flags : 0000001b
L2 cache : 256K unified
pmac-generation : NewWorld
Memory : 640 MB

My config is at <http://alioth.debian.org/~jo-guest/config-2.6.35>. With
the version 2.6.35-rc6 and the former config I didn't have this problem.

http://alioth.debian.org/~jo-guest/config-2.6.35-rc6
http://alioth.debian.org/~jo-guest/kern.log

(gdb) disassemble trace_hardirqs_on
Dump of assembler code for function trace_hardirqs_on:
0xc00aad3c <+0>: stwu r1,-32(r1)
0xc00aad40 <+4>: mflr r0
0xc00aad44 <+8>: stw r0,36(r1)
0xc00aad48 <+12>: stw r27,12(r1)
0xc00aad4c <+16>: stw r28,16(r1)
0xc00aad50 <+20>: stw r29,20(r1)
0xc00aad54 <+24>: stw r30,24(r1)
0xc00aad58 <+28>: stw r31,28(r1)
0xc00aad5c <+32>: mr r31,r1
0xc00aad60 <+36>: lis r11,-16287
0xc00aad64 <+40>: addi r10,r11,19736
0xc00aad68 <+44>: lwz r0,92(r10)
0xc00aad6c <+48>: andi. r9,r0,2
0xc00aad70 <+52>: beq 0xc00aae38 <trace_hardirqs_on+252>
0xc00aad74 <+56>: mfmsr r0
0xc00aad78 <+60>: andi. r0,r0,32768
0xc00aad7c <+64>: bne 0xc00aae38 <trace_hardirqs_on+252>
0xc00aad80 <+68>: lis r9,-16290
0xc00aad84 <+72>: lwz r28,88(r10)
0xc00aad88 <+76>: lwz r8,28568(r9)
0xc00aad8c <+80>: cmpwi cr7,r8,0
0xc00aad90 <+84>: lwz r8,0(r31)
0xc00aad94 <+88>: lwz r8,0(r8)
0xc00aad98 <+92>: lwz r27,4(r8)
0xc00aad9c <+96>: beq cr7,0xc00aae38 <trace_hardirqs_on+252>
0xc00aada0 <+100>: lwz r11,19736(r11)
0xc00aada4 <+104>: stw r0,28568(r9)
0xc00aada8 <+108>: cmpwi cr7,r11,0
0xc00aadac <+112>: beq cr7,0xc00aae38 <trace_hardirqs_on+252>
0xc00aadb0 <+116>: lwz r30,28(r28)
0xc00aadb4 <+120>: cmpwi cr7,r30,0
0xc00aadb8 <+124>: beq cr7,0xc00aae38 <trace_hardirqs_on+252>
0xc00aadbc <+128>: lwz r0,12(r30)
0xc00aadc0 <+132>: cmpwi cr7,r0,0
0xc00aadc4 <+136>: beq cr7,0xc00aae38 <trace_hardirqs_on+252>
0xc00aadc8 <+140>: lwz r0,0(r30)
0xc00aadcc <+144>: cmpwi cr7,r0,0
0xc00aadd0 <+148>: bne cr7,0xc00aae38 <trace_hardirqs_on+252>
0xc00aadd4 <+152>: mflr r29
0xc00aadd8 <+156>: lwarx r0,0,r30
0xc00aaddc <+160>: addic r0,r0,1

Bye, Jörg.
--
Two types have compatible type if their types are the same.
[ANSI C, 6.2.7]
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