Date: Thu, 9 Oct 2008 18:21:17 +0200
From: Folkert van Heusden <folkert@vanheusden.com>
To: linux-kernel@vger.kernel.org
Subject: [2.6.25 Power5 64bit] Unable to handle kernel paging request for
	data: something to do with /sys
Message-ID: <20081009162116.GF28224@vanheusden.com>
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Reply-By: Fri Oct 10 14:44:58 CEST 2008
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Hi,

While running my rmmod/modprobe script (an improved one that forks
itself a couple of times) I did twice the following:
	find /sys/ -type f | xargs cat > /dev/null
The second time it hang and I got an oops:
[ 5838.193438] Unable to handle kernel paging request for data at address 0xd00000000002b498
[ 5838.193456] Faulting instruction address: 0xc000000000033360
[ 5838.193468] Oops: Kernel access of bad area, sig: 11 [#2]
[ 5838.193477] SMP NR_CPUS=32 NUMA pSeries
[ 5838.193487] Modules linked in: ibmveth windfarm_cpufreq_clamp(+) ipv6 ext3 jbd mbcache sd_mod ibmvscsic scsi_transport_srp scsi_tgt scsi_mod windfarm_smu_sat windfarm_core [last unloaded: windfarm_pid]
[ 5838.193538] NIP: c000000000033360 LR: c000000000172678 CTR: c00000000011e32c
[ 5838.193552] REGS: c000000044ca79a0 TRAP: 0300   Tainted: G      D    (2.6.27-rc6-powerpc64)
[ 5838.193563] MSR: 8000000000009032 <EE,ME,IR,DR>  CR: 28004488  XER: 20000012
[ 5838.193588] DAR: d00000000002b498, DSISR: 0000000040000000
[ 5838.193598] TASK = c000000046335380[4877] 'find' THREAD: c000000044ca4000 CPU: 3
[ 5838.193610] GPR00: c0000000001726c0 c000000044ca7c20 c000000000638f50 d00000000002b498 
[ 5838.193630] GPR04: d00000000002b497 0000000000000005 0000000000000005 00000000000008be 
[ 5838.193650] GPR08: 0000000000000004 000000001003ba78 0000000000000000 0000000000000000 
[ 5838.193669] GPR12: 000000000000f032 c000000000663a00 0000000000000001 0000000000000003 
[ 5838.193689] GPR16: 000000000000000b 0000000000000000 0000000000000000 0000000000000004 
[ 5838.193708] GPR20: 000000001003d5a0 0000000000000000 0000000000000000 000000001003b998 
[ 5838.193728] GPR24: 0000000000000016 c000000044ca7de0 c000000044ca7de0 c0000000005fc780 
[ 5838.193747] GPR28: c00000004322d180 d00000000002b498 c0000000005d3bb0 c000000044ff2dc0 
[ 5838.193776] NIP [c000000000033360] .strlen+0x4/0x18
[ 5838.193789] LR [c000000000172678] .sysfs_readdir+0x150/0x200
[ 5838.193798] Call Trace:
[ 5838.193808] [c000000044ca7c20] [c0000000001726c0] .sysfs_readdir+0x198/0x200 (unreliable)
[ 5838.193826] [c000000044ca7cc0] [c00000000011e63c] .vfs_readdir+0xbc/0x118
[ 5838.193840] [c000000044ca7d70] [c00000000011e9b8] .sys_getdents64+0x84/0x104
[ 5838.193855] [c000000044ca7e30] [c0000000000086b4] syscall_exit+0x0/0x40
[ 5838.193867] Instruction dump:
[ 5838.193874] 4d820020 7ca903a6 38a3ffff 3884ffff 8c650001 2c830000 8c040001 7c601851 
[ 5838.193898] 4d860020 4102ffec 4e800020 3883ffff <8c040001> 2c000000 4082fff8 7c632050 
[ 5838.223292] ---[ end trace ac51cd380c187147 ]---


Folkert van Heusden

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