hi,
i got a exception in rtdm_dev_register(). I didnt call rtdm_dev_unregister in
my driver
and after insmodding the module again I got a oops.
xenomai 2.5.3, linux 2.6.32.11, x86 32bit, ubuntu 10.04.
Attached is the dmesg-trace and a small rtdm-module foo.c for reproduction:
insmod ./xeno_foo.ko
rmmod xeno_foo
insmod ./xeno_foo.ko - oops
thanks
stefan
UNAME := $(shell uname -r)
PWD := $(shell pwd)
LINUXSOURCEDIR:= /usr/src/linux-headers-$(UNAME)
obj-m := xeno_foo.o
xeno_foo-y:= foo.o
EXTRA_CFLAGS := -I/usr/src/linux-headers-$(UNAME)/include/xenomai
all::
$(MAKE) -C $(LINUXSOURCEDIR) SUBDIRS=$(PWD) modules
clean::
$(RM) .*.cmd *.cmd *.o *.ko *.mod.c *.order *.symvers
$(RM) -R .tmp*
.PHONY: clean
#include linux/module.h
#include rtdm/rtdm_driver.h
MODULE_AUTHOR( Stefan Kisdaroczi );
MODULE_LICENSE( GPL );
int foo_open_nrt( struct rtdm_dev_context *context,
rtdm_user_info_t *user_info,
int oflags ) {
return 0;
}
int foo_close_nrt( struct rtdm_dev_context *context,
rtdm_user_info_t *user_info ) {
return 0;
}
struct rtdm_device foo_rtdm_device = {
device_flags: RTDM_NAMED_DEVICE,
device_class: RTDM_CLASS_EXPERIMENTAL,
device_sub_class: RTDM_SUBCLASS_GENERIC,
device_name:foo0,
proc_name: foo0,
device_id: 0,
open_nrt : foo_open_nrt,
ops: {
close_nrt: foo_close_nrt,
},
};
int __init foo_init( void ) {
return rtdm_dev_register( foo_rtdm_device );
}
void __exit foo_exit( void ) {
/* rtdm_dev_unregister( foo_rtdm_device, 1000 ); */
}
module_init( foo_init );
module_exit( foo_exit );
[ 185.000326] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 185.000340] IP: [c01f873a] rtdm_dev_register+0x2ea/0x470
[ 185.000358] *pde =
[ 185.000365] Oops: [#1] SMP
[ 185.000373] last sysfs file:
/sys/devices/pci:00/:00:02.0/:01:00.2/:03:0d.0/host4/target4:0:1/4:0:1:0/block/sdb/uevent
[ 185.000381] Modules linked in: xeno_foo(+) snd_intel8x0 snd_ac97_codec
ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy hisax crc_ccitt isdn
snd_seq_oss com20020_pci snd_seq_midi snd_rawmidi snd_seq_midi_event com20020
arcnet snd_seq snd_timer snd_seq_device psmouse e752x_edac snd shpchp ppdev
soundcore serio_raw edac_core snd_page_alloc lp dcdbas parport_pc parport
usbhid floppy hid aic79xx e1000 scsi_transport_spi [last unloaded: xeno_foo]
[ 185.000468]
[ 185.000476] Pid: 2216, comm: insmod Not tainted (2.6.32.11-xenomai-2.5.3 #2)
Precision WorkStation 470
[ 185.000483] EIP: 0060:[c01f873a] EFLAGS: 00210202 CPU: 0
[ 185.000491] EIP is at rtdm_dev_register+0x2ea/0x470
[ 185.000498] EAX: 0001 EBX: 03a0 ECX: 03a0 EDX: f832e06c
[ 185.000503] ESI: EDI: f833f06c EBP: f6595f54 ESP: f6595f34
[ 185.000509] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[ 185.000515] Process insmod (pid: 2216, ti=f6594000 task=ecc1b340
task.ti=f6594000)
[ 185.000520] I-pipe domain Linux
[ 185.000524] Stack:
[ 185.000528] c019ba17 f6595f54 c059b953 f833f060 03a0 fffc f833f120
[ 185.000544] 0 f6595f5c f834200d f6595f88 c0101132 f833f120 c07723a0
fffc f833f120
[ 185.000563] 0 b7815ff4 f8342000 fffc f833f120 b7815ff4 f6595fac
c0175371 00200046
[ 185.000583] Call Trace:
[ 185.000594] [c019ba17] ? tracepoint_module_notify+0x27/0x30
[ 185.000605] [c059b953] ? notifier_call_chain+0x43/0x60
[ 185.000616] [f834200d] ? foo_init+0xd/0xf [xeno_foo]
[ 185.000627] [c0101132] ? do_one_initcall+0x32/0x1b0
[ 185.000636] [f8342000] ? foo_init+0x0/0xf [xeno_foo]
[ 185.000648] [c0175371] ? sys_init_module+0xb1/0x220
[ 185.000657] [c0103145] ? sysenter_do_call+0x12/0x16
[ 185.000663] Code: bf 92 c0 21 f1 c1 e1 03 89 4d f0 01 c8 8b 30 8b 16 0f 18
02 90 39 f0 0f 84 c8 00 00 00 89 5d ec 89 cb eb 1c 90 8d 74 26 00 8b 36 8b 06
0f 18 00 90 a1 c0 bf 92 c0 01 d8 39 c6 0f 84 a2 00 00 00
[ 185.000756] EIP: [c01f873a] rtdm_dev_register+0x2ea/0x470 SS:ESP
0068:f6595f34
[ 185.000767] CR2:
[ 185.000772] ---[ end trace dbaf656208b2cc62 ]---
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