ksysguardd is causing a kernel oops on armhf only

[Tobin Davis]

Everytime ksysguardd is started, it causes a kernel oops. Unable to reproduce this on armel system or on a UP armhf system.

[ 8706.890319] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[ 8706.890319] pgd = eeee4000
[ 8706.890319] [00000000] *pgd=ace29831, *pte=00000000, *ppte=00000000
[ 8706.890319] Internal error: Oops: 17 [#58] PREEMPT SMP
[ 8706.898345] Modules linked in: cpufreq_ondemand ppdev dm_crypt lp parport bnep rfcomm bluetooth wl12xx_sdio wl12xx mac80211 joydev cfg80211 dm_multipath leds_gpio dm_raid45 xor dm_mirror dm_region_hash dm_log btrfs zlib_deflate libcrc32c usbhid
[ 8706.898345] CPU: 1 Tainted: G D W (3.2.0-1405-omap4 #7-Ubuntu)
[ 8706.898498] PC is at vsnprintf+0x350/0x38c
[ 8706.898529] LR is at sprintf+0x28/0x30
[ 8706.898529] pc : [<c030386c>] lr : [<c03038d0>] psr: 200f0113
[ 8706.898529] sp : ee86fe48 ip : ee86fe98 fp : ee86fe94
[ 8706.898559] r10: 00000000 r9 : 00000000 r8 : ecb67000
[ 8706.898590] r7 : ecb67000 r6 : c063f190 r5 : ffffffff r4 : ee86feb8
[ 8706.898590] r3 : ee86feb8 r2 : 13498fff r1 : 7fffffff r0 : ecb67000
[ 8706.898620] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 8706.898620] Control: 10c5387d Table: aeee404a DAC: 00000015
[ 8706.898651] Process ksysguardd (pid: 18919, stack limit = 0xee86e2f8)
[ 8706.898681] Stack: (0xee86fe48 to 0xee870000)
[ 8706.898681] fe40: 00000000 ee7fc1c0 ecd36270 b6fc3000 ee86fe8c 13498fff
[ 8706.898681] fe60: 00000000 00000000 000280d0 ecb67000 ee545690 c063f190 ee529410 00001000
[ 8706.898742] fe80: 00000000 b6fbd000 ee86feb0 ee86fe98 c03038d0 c0303528 ee86e000 ee86feb8
[ 8706.898742] fea0: ecc4c0a8 ee86fed4 ee86fec0 c045d8c8 c03038b8 00000000 ecb67000 ee50f400
[ 8706.898742] fec0: c045d89c c09977dc ee86feec ee86fed8 c038e25c c045d8a8 ece91240 ee545690
[ 8706.898742] fee0: ee86ff0c ee86fef0 c0194ed4 c038e238 ecc4c0a0 ece91240 ee86ff70 ece91258
[ 8706.898742] ff00: ee86ff3c ee86ff10 c0194f80 c0194e5c ee86ff2c ee86ff20 00001000 ecc4c0a0
[ 8706.898864] ff20: b6fbd000 ee86ff70 00000000 00000000 ee86ff6c ee86ff40 c012e218 c0194f30
[ 8706.898895] ff40: ee86e000 b6fbd000 00001000 ecc4c0a0 b6fbd000 00001000 00000003 00000000
[ 8706.898895] ff60: ee86ffa4 ee86ff70 c012e330 c012e164 00000000 00000000 00000022 00000000
[ 8706.898895] ff80: ffffffff 008cc248 b6f7ec78 00000000 c000dee8 ee86e000 00000000 ee86ffa8
[ 8706.898956] ffa0: c000dc60 c012e2f0 008cc248 b6f7ec78 00000004 b6fbd000 00001000 00000000
[ 8706.898956] ffc0: 008cc248 b6f7ec78 00000000 00000003 bef7e7ac 0000000a bef7e7ac 00000000
[ 8706.899017] ffe0: 00000000 bef7e60c b6ef3355 b6f283fc 400f0110 00000004 00000000 00000000
[ 8706.899017] [<c030386c>] (vsnprintf+0x350/0x38c) from [<c03038d0>] (sprintf+0x28/0x30)
[ 8706.899017] [<c03038d0>] (sprintf+0x28/0x30) from [<c045d8c8>] (show_name+0x2c/0x30)
[ 8706.899017] [<c045d8c8>] (show_name+0x2c/0x30) from [<c038e25c>] (dev_attr_show+0x30/0x54)
[ 8706.899017] [<c038e25c>] (dev_attr_show+0x30/0x54) from [<c0194ed4>] (fill_read_buffer+0x84/0xd4)
[ 8706.899017] [<c0194ed4>] (fill_read_buffer+0x84/0xd4) from [<c0194f80>] (sysfs_read_file+0x5c/0x98)
[ 8706.899017] [<c0194f80>] (sysfs_read_file+0x5c/0x98) from [<c012e218>] (vfs_read+0xc0/0x18c)
[ 8706.899017] [<c012e218>] (vfs_read+0xc0/0x18c) from [<c012e330>] (sys_read+0x4c/0x78)
[ 8706.899017] [<c012e330>] (sys_read+0x4c/0x78) from [<c000dc60>] (ret_fast_syscall+0x0/0x30)
[ 8706.899017] Code: e1a01005 ebfffd07 e1a08000 e1a0a006 (e5da3000)
[ 8706.899322] ---[ end trace da227214a82491f3 ]---

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ksysguardd 4:4.8.0b-0ubuntu1
ProcVersionSignature: User Name 3.2.0-1405.7-omap4 3.2.1
Uname: Linux 3.2.0-1405-omap4 armv7l
ApportVersion: 1.91-0ubuntu1
Architecture: armhf
Date: Wed Feb 1 17:59:08 2012
ProcEnviron:
 LANGUAGE=
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: kde-workspace
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/925246

[Harald Sitter (apachelogger)]

Doesn't that also affect the kernel itself? I'd argue that the kernel should not go boom from a userspace app....

[Tobin Davis (gruemaster)]

Possibly. I'll add it to the bug for the kernel team to look over.

[Paolo Pisati (p-pisati)]

can you reproduce it with 3.2.0-1411-14?

[Tobin Davis (gruemaster)]

Yes. Just reproduced with the kubuntu beta2 release candidate image on omap4.