Message-ID: <201108041834.20575.tim.sander@hbm.com>
Date:	Thu, 4 Aug 2011 18:34:20 +0200
From:	"Tim Sander" <tim.sander@....com>
To:	"Thomas Gleixner" <tglx@...utronix.de>
Cc:	"LKML" <linux-kernel@...r.kernel.org>,
	"linux-rt-users" <linux-rt-users@...r.kernel.org>,
	"Peter Zijlstra" <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [ANNOUNCE] 3.0-rt6 : BUG at kernel/trmutex.c:724!

Hi 

I was really happy to find 6 preempt rt releases for the 3.0 kernel after holliday :-).

So i went for a testdrive and found an error: The error occurs in a non released non 
mainline kernel and is available from me upon request. It has been working on 
(2.6.39,3.0) but is not working on 3.0-rt6. It fails in an interrupt which calls: 

wake_up_interruptible(&hbm_device.wait);

The waitque has been initialized with:
init_waitqueue_head(&hbm_device.wait);
before interrupts where enabled. So i don't think its a race.

Will test if the 3.0-rc7 fixes the problem.

Best regards
Tim

Below is the output:
kernel BUG at kernel/rtmutex.c:724!
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c7148000
[00000000] *pgd=87131831, *pte=00000000, *ppte=00000000
Internal error: Oops: 817 [#1] PREEMPT
Modules linked in: msp fpga canterm i2c_imx netx netx_reset dspload fpgaload mxc_nand nand nand_ids nand_ecc
CPU: 0    Not tainted  (3.0.0-pmx-rt6-00007-g6b68987 #153)
PC is at __bug+0x24/0x30
LR is at vprintk+0x3ec/0x45c
pc : [<c002cbb0>]    lr : [<c003dd58>]    psr: 60000193
sp : c715fcf0  ip : c715fc30  fp : c715fcfc
r10: c0319234  r9 : 00000001  r8 : 00000040
r7 : 00000000  r6 : 00000001  r5 : c787d060  r4 : bf03c6c4
r3 : 00000000  r2 : 00010003  r1 : c715fc30  r0 : 0000002a
Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 00c5387d  Table: 87148008  DAC: 00000015
Process meassrv (pid: 450, stack limit = 0xc715e268)
Stack: (0xc715fcf0 to 0xc7160000)
fce0:                                     c715fd5c c715fd00 c023eb44 c002cb98
fd00: c023f268 c023ed68 c715fd3c c715fd18 c00346c8 c023f264 00000000 c00632b0
fd20: bf03c628 00000001 00000041 00000000 00000000 c02fee01 00000041 bf03c6c4
fd40: 00000001 00000001 00000000 00000040 c715fd6c c715fd60 c023f240 c023ea54
fd60: c715fd94 c715fd70 c00346a8 c023f23c c715fd8c c715fd80 bf03c628 00000001
fd80: 00000041 00000000 c715fdac c715fd98 bf03bb24 c0034690 c7b685a0 c02feef8
fda0: c715fde4 c715fdb0 c006eecc bf03ba70 ffffffff 00000004 000a25a8 c02feef8
fdc0: c7b685a0 c02f9678 00000002 00000040 00000003 00000001 c715fdfc c715fde8
fde0: c006f050 c006eea0 c02feef8 00000002 c715fe14 c715fe00 c00710c4 c006f000
fe00: c0071008 00000001 c715fe24 c715fe18 c006e8d8 c0071014 c715fe54 c715fe28
fe20: c0033210 c006e8b0 ffffffff 00000034 00000000 00340000 00000001 00000000
fe40: c715e000 00000000 c715fe64 c715fe58 c0033250 c003317c c715fe74 c715fe68
fe60: c006e8d8 c0033230 c715fe8c c715fe78 c0024068 c006e8b0 ffffffff f5800000
fe80: c715fee4 c715fe90 c002968c c002400c c0034fe8 c715fe48 c715fe78 00000000
fea0: bf03c6c4 c715ff18 c715ff0c c787d060 00000004 c715e000 00000000 c715fee4
fec0: c715fe18 c715fed8 c002cb70 c023f240 60000013 ffffffff c715ff04 c715fee8
fee0: c0056338 c023f23c c00365cc c715e000 41093914 c715ff0c c715ff3c c715ff08
ff00: bf03b9e0 c005631c 00000001 00000000 c787d060 c00365cc 00000000 00000000
ff20: 00000004 c7114b60 41093914 c715ff70 c715ff6c c715ff40 c009e95c bf03b99c
ff40: c715ff6c c715ff50 c009fab0 c7114b60 41093914 00000000 00000000 00000004
ff60: c715ffa4 c715ff70 c009ea2c c009e8b0 00000000 00000000 c715ff94 00000001
ff80: c0042578 bee199b4 00000000 4109fca8 00000003 c0029c04 00000000 c715ffa8
ffa0: c0029a80 c009e9f4 bee199b4 00000000 00000009 41093914 00000004 bee199b4
ffc0: bee199b4 00000000 4109fca8 00000003 410a0460 bee19934 00000000 4109ff9c
ffe0: 00000000 4108bb48 404e43fc 404e4bc4 80000010 00000009 86bae92e 86fa7a2e
Backtrace: 
[<c002cb8c>] (__bug+0x0/0x30) from [<c023eb44>] (rt_spin_lock_slowlock+0xfc/0x274)
[<c023ea48>] (rt_spin_lock_slowlock+0x0/0x274) from [<c023f240>] (rt_spin_lock+0x10/0x14)
 r8:00000040 r7:00000000 r6:00000001 r5:00000001 r4:bf03c6c4
[<c023f230>] (rt_spin_lock+0x0/0x14) from [<c00346a8>] (__wake_up+0x24/0x4c)
[<c0034684>] (__wake_up+0x0/0x4c) from [<bf03bb24>] (hbm_mmap_irq_handler+0xc0/0x100 [fpga])
 r7:00000000 r6:00000041 r5:00000001 r4:bf03c628
[<bf03ba64>] (hbm_mmap_irq_handler+0x0/0x100 [fpga]) from [<c006eecc>] (handle_irq_event_percpu+0x38/0x160)
 r5:c02feef8 r4:c7b685a0
[<c006ee94>] (handle_irq_event_percpu+0x0/0x160) from [<c006f050>] (handle_irq_event+0x5c/0x7c)
[<c006eff4>] (handle_irq_event+0x0/0x7c) from [<c00710c4>] (handle_level_irq+0xbc/0x108)
 r5:00000002 r4:c02feef8
[<c0071008>] (handle_level_irq+0x0/0x108) from [<c006e8d8>] (generic_handle_irq+0x34/0x48)
 r4:00000001 r3:c0071008
[<c006e8a4>] (generic_handle_irq+0x0/0x48) from [<c0033210>] (mxc_gpio_irq_handler+0xa0/0xb4)
[<c0033170>] (mxc_gpio_irq_handler+0x0/0xb4) from [<c0033250>] (mx3_gpio_irq_handler+0x2c/0x30)
[<c0033224>] (mx3_gpio_irq_handler+0x0/0x30) from [<c006e8d8>] (generic_handle_irq+0x34/0x48)
[<c006e8a4>] (generic_handle_irq+0x0/0x48) from [<c0024068>] (asm_do_IRQ+0x68/0x8c)
[<c0024000>] (asm_do_IRQ+0x0/0x8c) from [<c002968c>] (__irq_svc+0x4c/0x94)
Exception stack(0xc715fe90 to 0xc715fed8)
fe80:                                     c0034fe8 c715fe48 c715fe78 00000000
fea0: bf03c6c4 c715ff18 c715ff0c c787d060 00000004 c715e000 00000000 c715fee4
fec0: c715fe18 c715fed8 c002cb70 c023f240 60000013 ffffffff
 r5:f5800000 r4:ffffffff
[<c023f230>] (rt_spin_lock+0x0/0x14) from [<c0056338>] (add_wait_queue+0x28/0x4c)
[<c0056310>] (add_wait_queue+0x0/0x4c) from [<bf03b9e0>] (hbm_mmap_read+0x50/0xd4 [fpga])
 r6:c715ff0c r5:41093914 r4:c715e000 r3:c00365cc
[<bf03b990>] (hbm_mmap_read+0x0/0xd4 [fpga]) from [<c009e95c>] (vfs_read+0xb8/0x144)
 r7:c715ff70 r6:41093914 r5:c7114b60 r4:00000004
[<c009e8a4>] (vfs_read+0x0/0x144) from [<c009ea2c>] (sys_read+0x44/0x70)
 r8:00000004 r7:00000000 r6:00000000 r5:41093914 r4:c7114b60
[<c009e9e8>] (sys_read+0x0/0x70) from [<c0029a80>] (ret_fast_syscall+0x0/0x30)
 r8:c0029c04 r7:00000003 r6:4109fca8 r5:00000000 r4:bee199b4
Code: e59f0010 e1a01003 eb084104 e3a03000 (e5833000) 
---[ end trace 0000000000000002 ]---
Kernel panic - not syncing: Fatal exception in interrupt
Backtrace: 
[<c002cdb8>] (dump_backtrace+0x0/0x110) from [<c023ce34>] (dump_stack+0x18/0x1c)
 r6:00000000 r5:c715fca8 r4:c030f370 r3:00000000
[<c023ce1c>] (dump_stack+0x0/0x1c) from [<c023ce9c>] (panic+0x64/0x188)
[<c023ce38>] (panic+0x0/0x188) from [<c002d2f4>] (die+0x100/0x128)
 r3:00010000 r2:c715fb78 r1:00000001 r0:c02afc9d
 r7:00000817
[<c002d1f4>] (die+0x0/0x128) from [<c002f0a8>] (__do_kernel_fault+0x6c/0x8c)
 r7:c715fca8 r6:c7abae40 r5:00000817 r4:00000000
[<c002f03c>] (__do_kernel_fault+0x0/0x8c) from [<c002f1fc>] (do_page_fault+0x134/0x14c)
 r8:00000000 r7:c02f9190 r6:c787d060 r5:c7abae40 r4:c715fca8
r3:c715fca8
[<c002f0c8>] (do_page_fault+0x0/0x14c) from [<c002420c>] (do_DataAbort+0x38/0xa0)
[<c00241d4>] (do_DataAbort+0x0/0xa0) from [<c002960c>] (__dabt_svc+0x4c/0x80)
Exception stack(0xc715fca8 to 0xc715fcf0)
fca0:                   0000002a c715fc30 00010003 00000000 bf03c6c4 c787d060
fcc0: 00000001 00000000 00000040 00000001 c0319234 c715fcfc c715fc30 c715fcf0
fce0: c003dd58 c002cbb0 60000193 ffffffff
 r8:00000040 r7:00000000 r6:00000001 r5:c715fcdc r4:ffffffff
[<c002cb8c>] (__bug+0x0/0x30) from [<c023eb44>] (rt_spin_lock_slowlock+0xfc/0x274)
[<c023ea48>] (rt_spin_lock_slowlock+0x0/0x274) from [<c023f240>] (rt_spin_lock+0x10/0x14)
 r8:00000040 r7:00000000 r6:00000001 r5:00000001 r4:bf03c6c4
[<c023f230>] (rt_spin_lock+0x0/0x14) from [<c00346a8>] (__wake_up+0x24/0x4c)
[<c0034684>] (__wake_up+0x0/0x4c) from [<bf03bb24>] (hbm_mmap_irq_handler+0xc0/0x100 [fpga])
 r7:00000000 r6:00000041 r5:00000001 r4:bf03c628
[<bf03ba64>] (hbm_mmap_irq_handler+0x0/0x100 [fpga]) from [<c006eecc>] (handle_irq_event_percpu+0x38/0x160)
 r5:c02feef8 r4:c7b685a0
[<c006ee94>] (handle_irq_event_percpu+0x0/0x160) from [<c006f050>] (handle_irq_event+0x5c/0x7c)
[<c006eff4>] (handle_irq_event+0x0/0x7c) from [<c00710c4>] (handle_level_irq+0xbc/0x108)
 r5:00000002 r4:c02feef8
[<c0071008>] (handle_level_irq+0x0/0x108) from [<c006e8d8>] (generic_handle_irq+0x34/0x48)
 r4:00000001 r3:c0071008
[<c006e8a4>] (generic_handle_irq+0x0/0x48) from [<c0033210>] (mxc_gpio_irq_handler+0xa0/0xb4)
[<c0033170>] (mxc_gpio_irq_handler+0x0/0xb4) from [<c0033250>] (mx3_gpio_irq_handler+0x2c/0x30)
[<c0033224>] (mx3_gpio_irq_handler+0x0/0x30) from [<c006e8d8>] (generic_handle_irq+0x34/0x48)
[<c006e8a4>] (generic_handle_irq+0x0/0x48) from [<c0024068>] (asm_do_IRQ+0x68/0x8c)
[<c0024000>] (asm_do_IRQ+0x0/0x8c) from [<c002968c>] (__irq_svc+0x4c/0x94)
Exception stack(0xc715fe90 to 0xc715fed8)
fe80:                                     c0034fe8 c715fe48 c715fe78 00000000
fea0: bf03c6c4 c715ff18 c715ff0c c787d060 00000004 c715e000 00000000 c715fee4
fec0: c715fe18 c715fed8 c002cb70 c023f240 60000013 ffffffff
 r5:f5800000 r4:ffffffff
[<c023f230>] (rt_spin_lock+0x0/0x14) from [<c0056338>] (add_wait_queue+0x28/0x4c)
[<c0056310>] (add_wait_queue+0x0/0x4c) from [<bf03b9e0>] (hbm_mmap_read+0x50/0xd4 [fpga])
 r6:c715ff0c r5:41093914 r4:c715e000 r3:c00365cc
[<bf03b990>] (hbm_mmap_read+0x0/0xd4 [fpga]) from [<c009e95c>] (vfs_read+0xb8/0x144)
 r7:c715ff70 r6:41093914 r5:c7114b60 r4:00000004
[<c009e8a4>] (vfs_read+0x0/0x144) from [<c009ea2c>] (sys_read+0x44/0x70)
 r8:00000004 r7:00000000 r6:00000000 r5:41093914 r4:c7114b60
[<c009e9e8>] (sys_read+0x0/0x70) from [<c0029a80>] (ret_fast_syscall+0x0/0x30)
 r8:c0029c04 r7:00000003 r6:4109fca8 r5:00000000 r4:bee199b4


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