Hi,
Ettore Pedretti wrote:
2009/11/26 Alexis Berlemont <berlemont.h...@free.fr>:
On Thu, Nov 26, 2009 at 9:22 AM, Ettore Pedretti <epedr...@gmail.com> wrote:
Hi Alexis,
I applied the patch to my local git repository:
fangorn:/usr/src#
cd xenomai-head/
fangorn:/usr/src/xenomai-head# git apply ../patch_debug_1.diff
patch_debug_1.diff
fangorn:/usr/src/xenomai-head# git apply ../patch_debug_1.diff
../patch_debug_1.diff:14: trailing whitespace.
rtdm_printk("\t handler=%p, irq=%d, cookie=%p\n",
warning: 1 line adds whitespace errors.
Then created a debian package:
git-buildpackage -us -uc -rfakeroot --git-debian-branch=master
--git-upstream-branch=origin/master --git-ignore-new
built a new kernel package:
fakeroot make-kpkg --initrd --added-patches xenomai
--revision=ipipeComedi.2.4.06 --config menuconfig binary-arch
and installed the Debian package with dpkg -i
This is what happens when i insert the module into the kernel:
fangorn:~/control/CHAMP/irqTest# insmod irqTest.ko
Killed
Message from sysl...@fangorn at Nov 26 00:09:52 ...
kernel:Oops: 0000 [#1] PREEMPT SMP
fangorn:~/control/CHAMP/irqTest#
Message from sysl...@fangorn at Nov 26 00:09:52 ...
kernel:last sysfs file: /sys/class/net/lo/operstate
Message from sysl...@fangorn at Nov 26 00:09:52 ...
kernel:Process insmod (pid: 3566, ti=f6c02000 task=f78634b0 task.ti=f6c02000)
Message from sysl...@fangorn at Nov 26 00:09:52 ...
kernel:I-pipe domain Linux
Message from sysl...@fangorn at Nov 26 00:09:52 ...
kernel:Stack:
Message from sysl...@fangorn at Nov 26 00:09:52 ...
kernel:Call Trace:
Message from sysl...@fangorn at Nov 26 00:09:52 ...
kernel:Code: Bad EIP value.
Message from sysl...@fangorn at Nov 26 00:09:52 ...
kernel:EIP: [<00000000>] 0x0 SS:ESP 0068:f6c03f18
Message from sysl...@fangorn at Nov 26 00:09:52 ...
kernel:CR2: 0000000000000000
dmesg after insmod:
irq_test: before rtdm_irq_request
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<(null)>] (null)
*pde = 00000000
Oops: 0000 [#1] PREEMPT SMP
last sysfs file: /sys/class/net/lo/operstate
Modules linked in: irqTest(+) xeno_native analogy_ni_pcimio
analogy_ni_mio analogy_ni_tio analogy_8255 analogy_ni_mite
xeno_analogy xeno_rtdm astropci ext3 jbd mbcache ide_pci_generic
ide_core ata_piix sata_mv e1000 libata unix [last unloaded:
scsi_wait_scan]
Pid: 3566, comm: insmod Not tainted (2.6.31.1 #1) X6DA8
EIP: 0060:[<00000000>] EFLAGS: 00010246 CPU: 1
EIP is at 0x0
EAX: 00000030 EBX: 00000000 ECX: 00000030 EDX: c1250b80
ESI: f8e24500 EDI: 00000000 EBP: f6c03f1c ESP: f6c03f18
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process insmod (pid: 3566, ti=f6c02000 task=f78634b0 task.ti=f6c02000)
I-pipe domain Linux
Stack:
c1154166 f6c03f24 c105abf7 f6c03f40 f8a0ea5d f8e24000 00000000 00000000
<0> f8e27000 00000000 f6c03f58 f8e2703e 00000000 f8e24066 00000000 f8e27000
<0> f6c03f84 c1001028 f8e243c0 00000001 fffffffc f8e243c0 00000000 f6c03f84
Call Trace:
[<c1154166>] ? rthal_irq_enable+0x2d/0x31
[<c105abf7>] ? xnintr_enable+0xb/0xd
[<f8a0ea5d>] ? rtdm_irq_request+0x48/0x5e [xeno_rtdm]
[<f8e24000>] ? test_handler+0x0/0x1c [irqTest]
[<f8e27000>] ? __test_init+0x0/0x7e [irqTest]
[<f8e2703e>] ? __test_init+0x3e/0x7e [irqTest]
[<f8e27000>] ? __test_init+0x0/0x7e [irqTest]
[<c1001028>] ? do_one_initcall+0x23/0x183
[<c103a825>] ? blocking_notifier_call_chain+0x1a/0x1c
[<c10481e9>] ? sys_init_module+0xad/0x1ec
[<c1092cc5>] ? sys_close+0x71/0xb5
[<c1002c25>] ? sysenter_do_call+0x12/0x16
Code: Bad EIP value.
EIP: [<00000000>] 0x0 SS:ESP 0068:f6c03f18
CR2: 0000000000000000
---[ end trace ac2616367ecf94b2 ]---
I hope this is what you wanted me to try. Please let me know.
So if I understand well, you "insmoded" the little test module which
does nothing but calling rtdm_irq_request() and the NULL pointer bug
occured.
Correct
This bug occurred before calling analogy_config, you did not tried to
attach the ni_pcimio driver, right ?
I insmod-ed the test module that gave that error dump. I later tried
to attach the driver which causes the usual error. The stack-dumps I
sent are solely related to insmod of test program.
If I am right, it seems like the bug is not located in analogy but
between Xenomai's nucleus and Ipipe, which is ... weird.
What is your kernel configuration ? no IO_APIC ?
I put back my config to IO_APIC. Should I disable that again?
attached is my kernel configuration (configAnalogy)
Which irq did you try to request ? 48 or 5 ?
I do not know. do I have to pass parameters to insmod?
This is my /proc/interrupts if that is helpful
CPU0 CPU1
0: 222 0 IO-APIC-edge timer
1: 0 9 IO-APIC-edge i8042
2: 0 0 XT-PIC-XT cascade
12: 0 132 IO-APIC-edge i8042
14: 0 8 IO-APIC-edge ata_piix
15: 0 12358 IO-APIC-edge ata_piix
20: 0 0 IO-APIC-fasteoi astropci0
28: 0 235 IO-APIC-fasteoi sata_mv
54: 0 77950 IO-APIC-fasteoi eth0
NMI: 0 0 Non-maskable interrupts
LOC: 45365307 45365133 Local timer interrupts
SPU: 0 0 Spurious interrupts
CNT: 0 0 Performance counter interrupts
PND: 0 0 Performance pending work
RES: 2555 2212 Rescheduling interrupts
CAL: 60 58 Function call interrupts
TLB: 419 200 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 152 152 Machine check polls
ERR: 0
MIS: 0
and my /proc/xenomai/irq
IRQ CPU0 CPU1
516: 0 0 [IPI]
519: 46161773 46161772 [timer]
520: 0 0 [critical sync]
546: 0 0 [virtual]
Which CPU are you using ?
CPU0: Intel(R) Xeon(TM) CPU 3.00GHz stepping 03
CPU1: Intel(R) Xeon(TM) CPU 3.00GHz stepping 03
As Philippe rightly pointed out this is a 32-bit install although the
CPUs are 64 bit
Following Philippe's advice, I attached a little patch for your kernel
sources. Could you apply it and send the kernel log messages ?
You will also find attached the sources of a little module which calls
Linux' request_irq(48). Could you insmod the module and send a dump of
/proc/interrupts ?
Thank you for your time.
Cheers
Ettore
2009/11/24 Alexis Berlemont <berlemont.h...@free.fr>:
On Tuesday 24 November 2009 22:34:33 Ettore Pedretti wrote:
Hi,
Would it help at this stage if I re-enable IO APIC, run your program
and send you the call-stack dump? I am willing to test your patch on
our hardware as soon as you got one ready, if that can be of help.
Sorry, I did not answer your question. The bug occurs in both configurations;
so, do not bother changing your configuration for the moment.
Cheers
Ettore
2009/11/23 Alexis Berlemont <berlemont.h...@free.fr>:
Hi,
On Monday 23 November 2009 18:26:15 Ettore Pedretti wrote:
Hi,
It is finally working. here is the dmesg after I insert a module:
irq_test: before rtdm_irq_request
irq_test: after rtdm_irq_request (err = -22)
irq_test: before rtdm_irq_enable
irq_test: after rtdm_irq_enable (err = -22)
rtdm_irq_request() returns -EINVAL because the IO APIC is disabled. So,
the irq 48 turns into the irq 5;
Attached are a complete call-stack dump and my present kernel
configuration.
With the fact that there is still a NULL pointer bug without IO APIC, the
bug is bound to be located in analogy. There may be some wrong write
access on the interrupt structure.
I will come back with a patch which dumps the structure's content at
various locations in the attach code.
Cheers
Ettore
2009/11/23 Alexis Berlemont <berlemont.h...@free.fr>:
Hi,
On Mon, Nov 23, 2009 at 9:28 AM, Ettore Pedretti <e...@st-and.ac.uk>
wrote:
Hi,
I have compiled the module using this makefile:
prefix := $(shell /usr/bin/xeno-config --prefix)
obj-m := irqTest.o
ifeq ($(prefix),)
$(error Please add <xeno-install>/bin to your PATH variable)
endif
KDIR := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)
EXTRA_CFLAGS := -I/usr/include/xenomai -I/usr/include/
all: default
default:
$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
install:
$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules_install
clean:
rm -fr *.mod.c *.o *.ko irqTest *~ .irqTest* .tmp_versions
The module seems to compiles fine:
make -C /lib/modules/2.6.31.1/build
SUBDIRS=/home/ep41/control/CHAMP/irqTest modules
make[1]: Entering directory `/usr/src/linux-2.6.31.1'
CC [M] /home/ep41/control/CHAMP/irqTest/irqTest.o
Building modules, stage 2.
MODPOST 1 modules
CC /home/ep41/control/CHAMP/irqTest/irqTest.mod.o
LD [M] /home/ep41/control/CHAMP/irqTest/irqTest.ko
make[1]: Leaving directory `/usr/src/linux-2.6.31.1'
To make sure module dependencies are in place I modprobe irqbench
(probably not necessary).
modprobe xeno_irqbench
All the loaded modules:
fangorn:~# lsmod
Module Size Used by
xeno_irqbench 5152 0
xeno_native 83296 0
analogy_ni_pcimio 15676 0
analogy_ni_mio 41596 1 analogy_ni_pcimio
analogy_ni_tio 21724 1 analogy_ni_mio
analogy_8255 4060 1 analogy_ni_mio
analogy_ni_mite 9980 3
analogy_ni_pcimio,analogy_ni_mio,analogy_ni_tio xeno_analogy
38876 5
analogy_ni_pcimio,analogy_ni_mio,analogy_ni_tio,analogy_8255,analogy_
ni_ mite xeno_rtdm 24244 3
xeno_irqbench,analogy_ni_mio,xeno_analogy astropci
10968 0
ext3 112900 1
jbd 44016 1 ext3
mbcache 6652 1 ext3
ide_pci_generic 3712 0
ide_core 79388 1 ide_pci_generic
e1000 118204 0
ata_piix 15968 2
sata_mv 27632 0
libata 151468 2 ata_piix,sata_mv
unix 24460 10
When I insert the module it complains about missing symbols:
insmod irqTest.ko
insmod: error inserting 'irqTest.ko': -1 Unknown symbol in module
dmesg:
irqTest: module license 'unspecified' taints kernel.
Disabling lock debugging due to kernel taint
irqTest: Unknown symbol xnintr_enable
irqTest: Unknown symbol xnintr_detach
What am I doing wrong?
It's me who did wrong. I just tested the compilation inside the
kernel.
xnintr_* symbols are only exported for GPL compliant modules. So,
could you add the following line in the test module:
MODULE_LICENSE("GPL");
With that, the insmod operation should work.
BTW, I disabled CONFIG_X86_IO_APIC and the SMP option: same
problem.
Could you send the call-stack dump ? Maybe, that will unveil a clue.
Cheers
Ettore
2009/11/22 Alexis Berlemont <alexis.berlem...@gmail.com>:
Hi,
On Sunday 22 November 2009 20:35:51 Ettore Pedretti wrote:
Hello,
I downloaded Xenomai 2.5-rc4 from the xenomai-head.git. I need to
use the comedi drivers for Xenomai for a NI PCI-6711 function
generator board.
When I try to use the test program cmd_write (or cmd-read) I obtain
the following:
fangorn:~# cmd_write -vcmd_write: device analogy0 opened (fd=0)
cmd_write: basic descriptor retrieved
subdevices count = 0
read subdevice index = 0
write subdevice index = 0
cmd_write: a4l_get_desc failed (ret=-22)
*** glibc detected *** cmd_write: free(): invalid next size (fast):
0x0804d008 ***
======= Backtrace: =========
/lib/i686/cmov/libc.so.6[0xb7e52624]
/lib/i686/cmov/libc.so.6(cfree+0x96)[0xb7e54826]
cmd_write[0x804927c]
/lib/i686/cmov/libc.so.6(__libc_start_main+0xe5)[0xb7dfa455]
cmd_write[0x8048b01]
======= Memory map: ========
08048000-0804a000 r-xp 00000000 08:01 10855303 /usr/bin/cmd_write
0804a000-0804b000 rw-p 00002000 08:01 10855303 /usr/bin/cmd_write
0804b000-0806e000 rw-p 00000000 00:00 0 [heap]
b7c00000-b7c21000 rw-p 00000000 00:00 0
b7c21000-b7d00000 ---p 00000000 00:00 0
b7dce000-b7dda000 r-xp 00000000 08:01 6127619 /lib/libgcc_s.so.1
b7dda000-b7ddb000 rw-p 0000b000 08:01 6127619 /lib/libgcc_s.so.1
b7de0000-b7de3000 rw-s 00000000 00:0b 426 /dev/rtheap
b7de3000-b7de4000 rw-p 00000000 00:00 0
b7de4000-b7f39000 r-xp 00000000 08:01 6144250
/lib/i686/cmov/libc-2.7.so b7f39000-b7f3a000 r--p 00155000 08:01
6144250 /lib/i686/cmov/libc-2.7.so b7f3a000-b7f3c000 rw-p
00156000 08:01 6144250 /lib/i686/cmov/libc-2.7.so
b7f3c000-b7f3f000 rw-p 00000000 00:00 0
b7f3f000-b7f54000 r-xp 00000000 08:01 6144264
/lib/i686/cmov/libpthread-2.7.so
b7f54000-b7f56000 rw-p 00014000 08:01 6144264
/lib/i686/cmov/libpthread-2.7.so
b7f56000-b7f58000 rw-p 00000000 00:00 0
b7f58000-b7f5a000 r-xp 00000000 08:01 10808118
/usr/lib/librtdm.so.1.0.0 b7f5a000-b7f5b000 rw-p 00001000 08:01
10808118 /usr/lib/librtdm.so.1.0.0 b7f5b000-b7f5c000 rw-p
00000000 00:00 0
b7f5c000-b7f63000 r-xp 00000000 08:01 10808119
/usr/lib/libnative.so.3.0.0 b7f63000-b7f64000 rw-p 00006000 08:01
10808119 /usr/lib/libnative.so.3.0.0 b7f64000-b7f67000 r-xp
00000000 08:01 10808112 /usr/lib/libanalogy.so.1.0.0
b7f67000-b7f68000 rw-p 00002000 08:01 10808112
/usr/lib/libanalogy.so.1.0.0
b7f69000-b7f6a000 rw-p 00000000 00:00 0
b7f6a000-b7f6d000 rw-s 00000000 00:0b 426 /dev/rtheap
b7f6d000-b7f6f000 rw-p 00000000 00:00 0
b7f6f000-b7f89000 r-xp 00000000 08:01 6127618 /lib/ld-2.7.so
b7f89000-b7f8b000 rw-p 0001a000 08:01 6127618 /lib/ld-2.7.so
bfab1000-bfac6000 rw-p 00000000 00:00 0 [stack]
ffffe000-fffff000 r-xp 00000000 00:00 0 [vdso]
Aborted
This is probably because the device /dev/analogy0 does not exist.
This is the output of uname -a
Linux fangorn 2.6.31.1 #1 SMP PREEMPT Fri Nov 20 20:42:26 PST 2009
i686 GNU/Linux
And these are the relevant entries in dmesg
dmesg:
I-pipe 2.4-06: pipeline enabled.
I-pipe: Domain Xenomai registered.
Xenomai: hal/i386 started.
Xenomai: scheduling class idle registered.
Xenomai: scheduling class rt registered.
Xenomai: real-time nucleus v2.5-rc4 (Flying In A Blue Dream)
loaded. Xenomai: SMI-enabled chipset found
Xenomai: SMI workaround enabled
Xenomai: starting RTDM services.
Xenomai: starting native API services.
Analogy: MITE: Available NI device IDs: 0x1880
result of lspci for the relevant board:
04:01.0 Class ff00: National Instruments PCI-6711
And lsmod:
Module Size Used by
xeno_native 105088 0
analogy_ni_pcimio 15644 0
analogy_ni_mio 44860 1 analogy_ni_pcimio
analogy_ni_tio 24956 1 analogy_ni_mio
analogy_8255 3900 1 analogy_ni_mio
analogy_ni_mite 10140 3
analogy_ni_pcimio,analogy_ni_mio,analogy_ni_tio xeno_analogy
40220 5
analogy_ni_pcimio,analogy_ni_mio,analogy_ni_tio,analogy_8255,analog
y_n i_mit e xeno_rtdm 28436 2
analogy_ni_mio,xeno_analogy astropci 10944 0
ext3 109636 1
jbd 43920 1 ext3
mbcache 6272 1 ext3
ide_pci_generic 3712 0
ide_core 74204 1 ide_pci_generic
ata_piix 15748 2
sata_mv 26448 0
e1000 114208 0
libata 142156 2 ata_piix,sata_mv
unix 22992 10
According to this post:
http://www.mail-archive.com/xenomai-help@gna.org/msg09595.html
The analogy driver "a4l_pcimio" will be registered with your last
insmod (analogy_ni_pcimio). You can check that by typing "cat
/proc/analogy/drivers", you will see only one entry: a4l_pcimio.
fangorn:~# cat /proc/analogy/drivers
-- Analogy drivers --
| idx | driver name
| 00 | analogy_ni_pcimio
| 01 | analogy_8255
There are two entries and the drivers are not attached:
fangorn:~# cat /proc/analogy/devices
-- Analogy devices --
| idx | status | driver
| 00 | Unused | No driver
| 01 | Unused | No driver
| 02 | Unused | No driver
| 03 | Unused | No driver
| 04 | Unused | No driver
| 05 | Unused | No driver
| 06 | Unused | No driver
| 07 | Unused | No driver
| 08 | Unused | No driver
| 09 | Unused | No driver
I'm aware of the name change of the drivers:
http://www.mail-archive.com/xenomai-...@gna.org/msg00741.html
- a4l_pcimio becomes analogy_ni_pcimio
- 8255 becomes analogy_8255.
Consequently, the command line to attach these drivers has
changed. Starting from now, we have to type:
- analogy_config analogyX analogy_ni_pcimio (instead of
a4l_pcimio)
This is what happens when I try to attach the driver to de device:
fangorn:~# analogy_config analogy0 analogy_ni_pcimio
Message from sysl...@fangorn at Nov 21 23:22:37 ...
kernel:Oops: 0000 [#1] PREEMPT SMP
Message from sysl...@fangorn at Nov 21 23:22:37 ...
kernel:last sysfs file:
/sys/devices/pci0000:00/0000:00:1e.0/0000:06:02.0/class
Message from sysl...@fangorn at Nov 21 23:22:37 ...
kernel:Process analogy_config (pid: 3409, ti=f64cc000
task=f79013b0 task.ti=f64cc000)
Message from sysl...@fangorn at Nov 21 23:22:37 ...
kernel:I-pipe domain Linux
Message from sysl...@fangorn at Nov 21 23:22:37 ...
kernel:Stack:
Message from sysl...@fangorn at Nov 21 23:22:37 ...
kernel:Call Trace:
Message from sysl...@fangorn at Nov 21 23:22:37 ...
kernel:Code: 8b 45 9c e8 f2 f1 fa ff 89 c2 83 f8 01 0f 85 d4 fe ff
ff 8b 55 9c 8b 82 74 01 00 00 8b 00 f6 40 3c 06 0f 84 22 01 00 00
8b 42 18 <8b> 40 04 89 45 b0 8b 40 14 8b 40 04 85 c0 0f 84 0b 01 00
00 31
Message from sysl...@fangorn at Nov 21 23:22:37 ...
kernel:EIP: [<f8c7d029>] ni_E_init+0x267/0xff1 [analogy_ni_mio]
SS:ESP 0068:f64cddc8
Message from sysl...@fangorn at Nov 21 23:22:37 ...
kernel:CR2: 0000000000000004
relevant dmeg:
a4l: analogy_ni_pcimio: pcimio_attach: found pci-6711 board
mite 0000:04:01.0: PCI->APIC IRQ transform: INT A -> IRQ 48
mite 0000:04:01.0: setting latency timer to 64
a4l: MITE: 0xd0801000 mapped to f8e26000
a4l: DAQ: 0xd0800000 mapped to f8e2a000
a4l: MITE: version = 1, type = 1, mite mode = 1, interface mode = 3
a4l: MITE: num channels = 3, write post fifo depth = 1, wins = 0,
iowins = 2 a4l: analogy_ni_pcimio: pcimio_attach: found irq 48
BUG: unable to handle kernel NULL pointer dereference at 00000004
IP: [<f8c7d029>] ni_E_init+0x267/0xff1 [analogy_ni_mio]
*pde = 00000000
Oops: 0000 [#1] PREEMPT SMP
last sysfs file:
/sys/devices/pci0000:00/0000:00:1e.0/0000:06:02.0/class Modules
linked in: xeno_native analogy_ni_pcimio analogy_ni_mio
analogy_ni_tio analogy_8255 analogy_ni_mite xeno_analogy xeno_rtdm
astropci ext3 jbd mbcache ide_pci_generic ide_core ata_piix sata_mv
e1000 libata unix [last unloaded: scsi_wait_scan]
Pid: 3409, comm: analogy_config Not tainted (2.6.31.1 #1) X6DA8
EIP: 0060:[<f8c7d029>] EFLAGS: 00010202 CPU: 1
EIP is at ni_E_init+0x267/0xff1 [analogy_ni_mio]
EAX: 00000000 EBX: f8a22280 ECX: f8c31e6c EDX: f8c31e60
ESI: 00000000 EDI: f8c31e60 EBP: f64cde38 ESP: f64cddc8
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process analogy_config (pid: 3409, ti=f64cc000 task=f79013b0
task.ti=f64cc000) I-pipe domain Linux
Stack:
f64cddd0 c10142b6 f64cddd8 f8c31e60 f64cdde0 c105abf7 f64cddfc
f8a0ea5d <0> f8c2be00 00000000 00000001 f8c31e94 fffffff0 f64cde14
f8c2c118 00000001 <0> f8c2ed0d f8c31e88 f8c31e60 f64cde38 f8c2cccf
00000001 f8c31e60 00000030 Call Trace:
[<c10142b6>] ? unmask_IO_APIC_irq+0xd/0xf
[<c105abf7>] ? xnintr_enable+0xb/0xd
[<f8a0ea5d>] ? rtdm_irq_request+0x48/0x5e [xeno_rtdm]
[<f8c2be00>] ? a4l_handle_irq+0x0/0x1a [xeno_analogy]
[<f8c2c118>] ? __a4l_request_irq+0x33/0x39 [xeno_analogy]
[<f8c2cccf>] ? a4l_request_irq+0x98/0xaf [xeno_analogy]
[<f8c8bd8a>] ? pcimio_attach+0x54d/0x664 [analogy_ni_pcimio]
[<f8c2afef>] ? a4l_assign_driver+0x61/0x134 [xeno_analogy]
[<f8c2b2ba>] ? a4l_device_attach+0x54/0x6d [xeno_analogy]
[<c10662ea>] ? xnshadow_ppd_get+0x4f/0x58
[<f8c2b54f>] ? a4l_ioctl_devcfg+0x57/0x104 [xeno_analogy]
[<f8c2d36f>] ? a4l_rt_ioctl+0x33/0x3a [xeno_analogy]
[<f8a0d3e6>] ? __rt_dev_ioctl+0xd1/0xd8 [xeno_rtdm]
[<f8a0fe77>] ? sys_rtdm_open+0x5c/0x64 [xeno_rtdm]
[<f8a0fdde>] ? sys_rtdm_ioctl+0x29/0x2b [xeno_rtdm]
[<c10699ae>] ? losyscall_event+0xa9/0x190
[<c10566ce>] ? __ipipe_dispatch_event+0xdf/0x201
[<c1069905>] ? losyscall_event+0x0/0x190
[<c10166a1>] ? __ipipe_syscall_root+0x3b/0xc4
[<c1002cfd>] ? system_call+0x2d/0x4f
Code: 8b 45 9c e8 f2 f1 fa ff 89 c2 83 f8 01 0f 85 d4 fe ff ff 8b
55 9c 8b 82 74 01 00 00 8b 00 f6 40 3c 06 0f 84 22 01 00 00 8b 42
18 <8b> 40 04 89 45 b0 8b 40 14 8b 40 04 85 c0 0f 84 0b 01 00 00 31
EIP: [<f8c7d029>] ni_E_init+0x267/0xff1 [analogy_ni_mio] SS:ESP
0068:f64cddc8 CR2: 0000000000000004
---[ end trace c887d49bb5e86cf4 ]---
Thanks for such a great report.
I keep two things in mind:
- cmd_write's error handling path is not buggy (that was already in
my todo list). I will fix that as soon as possible.
- according to the call-stack dump you made, the irq handler
registering seems to be the source of the trouble. What strikes me
is that the oops occurred very low (unmask_IO_APIC_irq: we are no
more in the analogy layer).
In order to be sure that the problem is located in analogy, it would
be great to test that calling rtdm_request_irq(... , 48, ...) does
not trigger the bug.
Here is a little test module you could try to insmod. If you do not
want to bother finding out how to compile it, you can replace the
code of an existing rtdm driver (for example:
xenomai/ksrc/drivers/testing/irqbench.c) with the source below.
Another interesting test would be to disable CONFIG_X86_IO_APIC in
your kernel configuration (in "Processor type and features", disable
the SMP option and disable "IO APIC" under "Local APIC").
#include <linux/version.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <rtdm/rtdm_driver.h>
int test_handler(rtdm_irq_t *irq_handle)
{
rtdm_printk("irq_test: INTERRUPT!\n");
return RTDM_IRQ_HANDLED;
}
static rtdm_irq_t handle;
static int __init __test_init(void)
{
int err;
rtdm_printk("irq_test: before rtdm_irq_request\n");
err = rtdm_irq_request(&handle, 48, test_handler, 0,
"test_irq", NULL);
rtdm_printk("irq_test: after rtdm_irq_request (err = %d)\n",
err);
rtdm_printk("irq_test: before rtdm_irq_enable\n");
err = rtdm_irq_enable(&handle);
rtdm_printk("irq_test: after rtdm_irq_enable (err = %d)\n",
err);
return err;
}
static void __exit __test_exit(void)
{
rtdm_irq_free(&handle);
}
module_init(__test_init);
module_exit(__test_exit);
Can anyone help?
Best regards
Ettore Pedretti
Alexis.
Alexis.
_______________________________________________
Xenomai-help mailing list
Xenomai-help@gna.org
https://mail.gna.org/listinfo/xenomai-help
>
Alexis.
diff -uNrp linux-2.6.31.1-xeno-perso/arch/x86/kernel/apic/io_apic.c linux-2.6.31.1-xeno-perso-x86_64-local/arch/x86/kernel/apic/io_apic.c
--- linux-2.6.31.1-xeno-perso/arch/x86/kernel/apic/io_apic.c 2009-10-16 15:39:55.000000000 +0200
+++ linux-2.6.31.1-xeno-perso-x86_64-local/arch/x86/kernel/apic/io_apic.c 2009-11-29 23:34:40.000000000 +0100
@@ -1357,6 +1357,11 @@ static inline int IO_APIC_irq_trigger(in
static void ioapic_register_intr(int irq, struct irq_desc *desc, unsigned long trigger)
{
+#if 1 /* debug */
+ printk("ioapic_register_intr: irq = %d, trig = %lu, apic_trig = %d, remap = %d\n",
+ irq, trigger, IO_APIC_irq_trigger(irq), irq_remapped(irq));
+#endif /* debug */
+
if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
trigger == IOAPIC_LEVEL)
desc->status |= IRQ_LEVEL;
#include <linux/version.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
static int test_var;
static irqreturn_t test_handler(int irq, void *arg)
{
printk("irq_test: INTERRUPT!\n");
return IRQ_HANDLED;
}
static int __init __test_init(void)
{
int err;
printk("irq_test: before request_irq\n");
err = request_irq(48, test_handler, IRQF_SHARED, "test_irq", &test_var);
printk("irq_test: after request_irq (err = %d)\n", err);
return err;
}
static void __exit __test_exit(void)
{
free_irq(48, &test_var);
}
MODULE_LICENSE("GPL");
module_init(__test_init);
module_exit(__test_exit);
_______________________________________________
Xenomai-help mailing list
Xenomai-help@gna.org
https://mail.gna.org/listinfo/xenomai-help
