linux-kernel - Re: [ANNOUNCE] 3.0.1-rt8

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Date:	Thu, 11 Aug 2011 18:22:54 +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: Re: [ANNOUNCE] 3.0.1-rt8 - Regression to 3.0-rt7

Am Donnerstag, 11. August 2011, 18:14:45 schrieb Peter Zijlstra:
> On Thu, 2011-08-11 at 18:04 +0200, Tim Sander wrote:
> > 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-rt8-00009-g39305ab #167)
> > PC is at __bug+0x24/0x30
> > LR is at walk_stackframe+0x24/0x40
> > pc : [<c002cbf0>]    lr : [<c002cbb0>]    psr: 60000113
> > sp : c782ff40  ip : c782fe28  fp : c782ff4c
> > r10: 00000001  r9 : 00000000  r8 : c78663c0
> > r7 : c030463c  r6 : c782e000  r5 : 00000000  r4 : c78663c0
> > r3 : 00000000  r2 : 00000001  r1 : c782fe58  r0 : 00000034
> > Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
> > Control: 00c5387d  Table: 87b70008  DAC: 00000017
> > Process posixcputmr/0 (pid: 6, stack limit = 0xc782e268)
> > Stack: (0xc782ff40 to 0xc7830000)
> > ff40: c782ff8c c782ff50 c005a5c0 c002cbd8 00000000 c782ff54 c782ff54
> > 00000000 ff60: 00000000 c78663c0 00000000 c782e000 c030463c c78663c0
> > 00000000 00000001 ff80: c782ffbc c782ff90 c005a88c c005a594 00000000
> > c7817f28 00000000 c782ffcc ffa0: c005a800 00000000 00000000 00000000
> > c782fff4 c782ffc0 c00570f0 c005a80c ffc0: c7817f28 00000000 00000000
> > 00000000 c782ffd0 c782ffd0 c7817f28 c0057064 ffe0: c0040868 00000013
> > 00000000 c782fff8 c0040868 c0057070 cccdcd6c ffdec890 Backtrace:
> > [<c002cbcc>] (__bug+0x0/0x30) from [<c005a5c0>]
> > (__run_posix_cpu_timers+0x38/0x278) [<c005a588>]
> > (__run_posix_cpu_timers+0x0/0x278) from [<c005a88c>]
> > (posix_cpu_timers_thread+0x8c/0x124) [<c005a800>]
> > (posix_cpu_timers_thread+0x0/0x124) from [<c00570f0>]
> > (kthread+0x8c/0x94) [<c0057064>] (kthread+0x0/0x94) from [<c0040868>]
> > (do_exit+0x0/0x2d8)
> > 
> >  r7:00000013 r6:c0040868 r5:c0057064 r4:c7817f28
> > 
> > Code: e59f0010 e1a01003 eb086a88 e3a03000 (e5833000)
> > ---[ end trace d632afeaa11559d4 ]---
> 
> Yay a new one, and this is a PREEMPT_LL build right? /me goes poke at
> it.
No sorry i forgot to mention, it a CONFIG_PREEMPT_RTB=y build. The 
CONFIG_PREEMPT_LL=y still gives shows the same error i posted already.
If you like i can reproduce it for CONFIG_PREEMPT_LL.

Best regareds
Tim

PS: attached the corresponding kernel config for the above bug.

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