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.
>
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