linux-kernel - [ANNOUNCE] 3.0-rt7 - Error with low latency desktop config

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Date:	Tue, 9 Aug 2011 15:48:06 +0200
From:	"Tim Sander" <tim.sander@....com>
To:	"Peter Zijlstra" <peterz@...radead.org>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ibm.com>,
	"linux-rt-users" <linux-rt-users@...r.kernel.org>
Subject: [ANNOUNCE] 3.0-rt7 - Error with low latency desktop config

Hi

When running a slightly patched 3.0-rt7 kernel  as a low latency desktop config 
with the kconfig as attached i get appended error below. 

I'm not sure if you are interested in these errors but since you are aiming 
for inclusion into mainline, i think these errors are also worthwhile?

Note this is not a vanilla 3.0-rt7 since that does not run on our hardware, 
but tried to make sure that this error is not from my platform patches.

Best regards
Tim 

PS: This error does not occur on non vanilla 3.0 (without rt7 patch)
PPS: This seems to apear on every boot:

kernel BUG at kernel/posix-cpu-timers.c:1315!
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c0004000
[00000000] *pgd=00000000
Internal error: Oops: 817 [#1] PREEMPT
Modules linked in: i2c_imx(+) netx netx_reset dspload fpgaload mxc_nand(+) 
nand nand_ids nand_ecc
CPU: 0    Not tainted  (3.0.0-pmx-rt7 #1)
PC is at __bug+0x24/0x30
LR is at walk_stackframe+0x24/0x40
pc : [<c002cbd0>]    lr : [<c002cb90>]    psr: 60000113
sp : c782ff40  ip : c782fe28  fp : c782ff4c
r10: 00000001  r9 : 00000000  r8 : c7896140
r7 : c030463c  r6 : c782e000  r5 : 00000000  r4 : c7896140
r3 : 00000000  r2 : 00000001  r1 : c782fe58  r0 : 00000034
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Control: 00c5387d  Table: 87b64008  DAC: 00000017
Process posixcputmr/0 (pid: 6, stack limit = 0xc782e268)
Stack: (0xc782ff40 to 0xc7830000)
ff40: c782ff8c c782ff50 c005a4e4 c002cbb8 00000000 c782ff54 c782ff54 00000000
ff60: 00000000 c7896140 00000000 c782e000 c030463c c7896140 00000000 00000001
ff80: c782ffbc c782ff90 c005a7b0 c005a4b8 00000000 c7817f28 00000000 c782ffcc
ffa0: c005a724 00000000 00000000 00000000 c782fff4 c782ffc0 c0057014 c005a730
ffc0: c7817f28 00000000 00000000 00000000 c782ffd0 c782ffd0 c7817f28 c0056f88
ffe0: c004078c 00000013 00000000 c782fff8 c004078c c0056f94 00000000 00000000
Backtrace: 
[<c002cbac>] (__bug+0x0/0x30) from [<c005a4e4>] 
(__run_posix_cpu_timers+0x38/0x278)
[<c005a4ac>] (__run_posix_cpu_timers+0x0/0x278) from [<c005a7b0>] 
(posix_cpu_timers_thread+0x8c/0x124)
[<c005a724>] (posix_cpu_timers_thread+0x0/0x124) from [<c0057014>] 
(kthread+0x8c/0x94)
[<c0056f88>] (kthread+0x0/0x94) from [<c004078c>] (do_exit+0x0/0x2d8)
 r7:00000013 r6:c004078c r5:c0056f88 r4:c7817f28
Code: e59f0010 e1a01003 eb0867d0 e3a03000 (e5833000) 
---[ end trace 63ab5ae31a00e99a ]---

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View attachment "kernelconfig" of type "text/plain" (46370 bytes)