sysfs crashes while recursively checking file permissions

From: Chintan Pandya
Date: Fri Nov 02 2012 - 03:50:25 EST

Hi,

I am running one test on my ARM system which checks the sysfs file
system's whole directory recursively and checks its file permission.
While I perform this test, I face random (as in varies the nature of
crash sometimes) crashes like one mentioned below.


<1>[ 67.442660] Unable to handle kernel paging request at virtual address efd3d794

<1>[ 67.448840] pgd = da364000

<1>[ 67.451529] [efd3d794] *pgd=00000000

<0>[ 67.455092] Internal error: Oops: 5 [#1] PREEMPT SMP ARM

<4>[ 67.460385] Modules linked in:

<4>[ 67.463424] CPU: 1 Not tainted (3.4.0-perf-g45c04fe-00006-g8a5c5e2 #27)

<4>[ 67.470382] PC is at rb_next+0x38/0x60

<4>[ 67.474103] LR is at sysfs_readdir+0x1f8/0x288

<4>[ 67.478528] pc : [<c02f7c50>] lr : [<c01c1fe8>] psr: a0000013

<4>[ 67.478532] sp : d90adf10 ip : 00000078 fp : 0000000b

<4>[ 67.489984] r10: 00004a0e r9 : 00000004 r8 : 00000000

<4>[ 67.495193] r7 : dbea2e00 r6 : 00000000 r5 : db9385c0 r4 : d8ada0c0

<4>[ 67.501704] r3 : efd3d790 r2 : efd3d790 r1 : db9385d0 r0 : dbea2e50

<4>[ 67.508216] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user

<4>[ 67.515333] Control: 10c5787d Table: 5a56406a DAC: 00000015

<4>[ 67.521061]

<4>[ 67.521063] PC: 0xc02f7bd0:

<4>[ 67.525313] 7bd0 e1500002 05813008 15813004 e5902008 e3520000 15921000 12011003 11831001

<4>[ 67.533473] 7bf0 15821000 e5902004 e3520000 15921000 12011003 11831001 15821000 e8900007

<4>[ 67.541632] 7c10 e8830007 e12fff1e e5903000 e3c33003 e1500003 03a03000 0a000010 e5903004

<4>[ 67.549791] 7c30 e3530000 1a00000a ea000000 e1a00002 e5902000 e3c22003 e2523000 0a000007

<4>[ 67.557951] 7c50 e5921004 e1500001 0afffff7 ea000003 e1a03002 e5932008 e3520000 1afffffb

<4>[ 67.566112] 7c70 e1a00003 e12fff1e e92d4010 e1a04000 e5903004 e5902008 e3530000 1a000003

<4>[ 67.574271] 7c90 e2523000 05903000 03c33003 ea00000b e3520000 0a000009 ebffffda e5902004

<4>[ 67.582430] 7cb0 e1a03000 e3520000 11a03002 1a000003 e5932000 e3c22003 e1540002 11a03002

<4>[ 67.590592]

<4>[ 67.590594] LR: 0xc01c1f68:

<4>[ 67.594844] 1f68 e2833001 e1852f93 e3320000 1afffffa e59f00ec e5845078 eb16e059 e1c422d8

<4>[ 67.603003] 1f88 e1a01008 e58da008 e58d600c e1cd20f0 e1a0200b e59d3024 e58d9010 e59d0020

<4>[ 67.611163] 1fa8 e12fff33 e1a08000 e59f00b4 eb16e0fe e3580000 ba000015 e5942028 e1a01007

<4>[ 67.619323] 1fc8 e59d001c e3a03000 e58d5000 ebffff33 e2505000 0a00000d e2850010 eb04d70b

<4>[ 67.627483] 1fe8 e3500000 0a000005 e5903010 e2405010 e59d101c e1530001 1afffff6 ea000001

<4>[ 67.635643] 2008 e1a05000 ea000001 e3550000 1affffbf e59f004c eb16e032 e1c422d8 e3520002

<4>[ 67.643803] 2028 e2d31000 b3a03000 a3a03001 e3550000 13a05000 02035001 e3550000 13a03000

<4>[ 67.651963] 2048 13e02102 11c422f8 13a03000 15843078 e3a00000 e28dd02c e8bd8ff0 c09e096e

<4>[ 67.660123]

<4>[ 67.660125] SP: 0xd90ade90:

<4>[ 67.664376] de90 00000007 205bdf78 37362020 3234342e 5d363436 d90a0020 d90ac000 c016f80c

<4>[ 67.672535] deb0 d90adebc c02f7c50 a0000013 ffffffff d90adefc c077ca58 dbea2e50 db9385d0

<4>[ 67.680694] ded0 efd3d790 efd3d790 d8ada0c0 db9385c0 00000000 dbea2e00 00000000 00000004

<4>[ 67.688854] def0 00004a0e 0000000b 00000078 d90adf10 c01c1fe8 c02f7c50 a0000013 ffffffff

<4>[ 67.697014] df10 db9385c0 00000000 00004a0e 00000000 00000004 00000000 dbe02480 00000000

<4>[ 67.705175] df30 d90adf80 c0172598 d8d87f08 d8ada0c0 dbdbe068 c0172598 00000000 dbdbe000

<4>[ 67.713334] df50 d90ac000 d90adf80 0000cb6c c017282c 83068137 420670d0 00000000 00001068

<4>[ 67.721493] df70 d8ada0c0 c000e068 00000000 c01729b4 420671e0 420671c0 00000f58 ffffffea

<4>[ 67.729654]

<4>[ 67.729656] R0: 0xdbea2dd0:

<4>[ 67.733907] 2dd0 dbe98300 daaf9b10 dbebb1d0 00000000 00000000 2c53e300 c0c69208 00000003

<4>[ 67.742067] 2df0 dbea2f50 40ed0001 000001e3 00000000 00000012 00000000 dbe30c40 dbea2dc0

<4>[ 67.750226] 2e10 dbe98391 daad60d0 dbebb210 00000000 00000000 2c53e300 c0c69208 00000003

<4>[ 67.758385] 2e30 dbea2f90 41ed0001 000001e3 00000000 00000003 00000000 dbea2e00 c0a10df6

<4>[ 67.766547] 2e50 efd3d791 db9385d0 db938010 00000000 00000000 57c6bb9d c0c9c8a4 00000000

<4>[ 67.774706] 2e70 00000000 81a40002 000001e4 00000000 00000001 00000000 efd3d600 c09cd4b0

<4>[ 67.782865] 2e90 dbea2f91 db937e10 dbea4010 00000000 00000000 27692f8b c0c9cb78 00000000

<4>[ 67.791024] 2eb0 00000000 81240002 000001e5 00000000 5f6d736d 5f6d6163 76726573 302e7265

<4>[ 67.799185]

<4>[ 67.799187] R1: 0xdb938550:

<4>[ 67.803439] 8550 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

<4>[ 67.811598] 8570 00000000 00000000 00000000 00000000 65646976 696c346f 0078756e 00000000

<4>[ 67.819758] 8590 00000000 00000000 00000000 00000000 00000000 00000000 00800000 00000000

<4>[ 67.827916] 85b0 00000000 00000000 00000000 00000000 00000009 00000000 dbea2e00 db938580

<4>[ 67.836076] 85d0 dbea2e50 00000000 00000000 00000000 00000000 79ac7656 db938500 00000006

<4>[ 67.844236] 85f0 db1b3390 41ed0001 00004a0e 00000000 65646976 3030316f 00000000 00000000

<4>[ 67.852395] 8610 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

<4>[ 67.860557] 8630 00000000 00000000 00000000 00000000 0000000c 00000000 db9385c0 db938600

<4>[ 67.868716]

<4>[ 67.868718] R2: 0xefd3d710:

<4>[ 67.872970] d710 ******** ******** ******** ******** ******** ******** ******** ********

<4>[ 67.881129] d730 ******** ******** ******** ******** ******** ******** ******** ********

<4>[ 67.889289] d750 ******** ******** ******** ******** ******** ******** ******** ********

<4>[ 67.897448] d770 ******** ******** ******** ******** ******** ******** ******** ********


I am using kernel 3.4.0. Steps to re-produce
->cd /sys/devices/platform/
->ls -l -R *

Any clues for debugging ?

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