On Thu, Mar 15, 2018 at 2:08 PM, Philippe Gerum <[email protected]> wrote:
> On 03/15/2018 09:24 AM, Pintu Kumar wrote:
>> Hi All,
>>
>> I am trying to test rt_cond_bind() and rt_task_unblock() API with a
>> simple thread program using the Xenomai native skin, and with xenomai
>> 3.0.6.
>>
>> But, during call to rt_task_unblock(&task1) from the main function, I
>> get the segmentation fault.
>>
>
> Use gdb to get more information about the crash.
>
Here is the gdb output:
Thread 1 "cond_bin_test" received signal SIGSEGV, Segmentation fault.
cobalt_monitor_exit (mon=0x3c) at internal.c:232
warning: Source file is more recent than executable.
232 state = get_monitor_state(mon);
(gdb) backtrace
#0 cobalt_monitor_exit (mon=0x3c) at internal.c:232
#1 0x0000ffffb7f80058 in monitor_exit (sobj=<optimized out>) at syncobj.c:72
#2 syncobj_unlock (sobj=<optimized out>, syns=0xfffffffff960) at syncobj.c:279
#3 0x0000ffffb7f81be8 in threadobj_unblock (thobj=thobj@entry=0xffffb739df88)
at threadobj.c:1570
#4 0x0000ffffb7fa13b0 in rt_task_unblock (task=<optimized out>) at task.c:1353
#5 0x00000000004011d8 in main (argc=1, argv=0x413710) at cond_bin_test:92
(gdb)
Its crashing inside, rt_task_unblock().
I also get these back trace on console:
Kernel backtrace :
root@:~/mine/xenomai-3/testsuite/cond# [ 7923.372700]
cond_bind_test[26257]: unhandled level 2 translation fault (11) at
0x00000040, esr 0x92000006
[ 7923.381677] mm_pgd = ffff800031fde000, hw_pgd = ffff800031fdc000
[ 7923.387684] [00000040] *pgd=00000000340fe003,
*pud=00000000316b4003, *pmd=0000000000000000
[ 7923.395962]
....
It looks like there is some clean up problem that needs to be handled.
I could not find any sample reference about how to use rt_cond_bind()
along with rt_task_unblock().
If you can share a sample logic, it would be great.
>> # ./cond_bin_test
>> PINTU: Inside bind_test task....
>> PINTU: Before rt_task_unblock
>> Segmentation fault (core dumped)
>>
>> This is the code snippet for the program:
>>
>> void bind_test(...)
>> {
>> ....
>> err = rt_cond_bind(&cond, "COND1", TM_INFINITE);
>> if (err == -EINTR)
>> printf("error....");
>> }
>>
>> int main(...)
>> {
>> ....
>> rt_task_create(&bind_test, .....);
>> rt_task_start(&bind_test, .......);
>>
>> err = rt_task_unblock(&bind_test);
>>
>> rt_task_delete(&bind_test);
>>
>>
>> return 0;
>> }
>>
>> What is wrong with the above sample ?
>> I suppose this code was working on Xenomai 2.6.x
>>
>> If there is any thing missing please let me know.
>
> Your full test code. Task descriptor definition and flags are missing.
>
Makefile is like this:
target = cond_bind_test
skin = alchemy
CC := $(shell $(INSTALL_PATH)/xeno-config --cc)
CFLAGS := $(shell $(INSTALL_PATH)/xeno-config --skin=$(skin) --cflags)
LDFLAGS := $(shell $(INSTALL_PATH)/xeno-config --skin=$(skin) --ldflags)
$(target): cond_bind_test
$(CC) -o $@ $< $(CFLAGS) $(LDFLAGS)
------------
The majority of sample program as a given above. I just removed some
error condition checks and declarations.
Task details are as follows:
err = rt_task_create(&task1, NULL, 0, 99, T_JOINABLE);
err = rt_task_start(&task1, &bind_test, NULL);
err = rt_task_unblock(&bind_test);
Apart from these there is nothing more...
If you need more information please let me know.
I think we can easily reproduce it on Xenomai 3.0.6 if we just call
these functions.
> --
> Philippe.
_______________________________________________
Xenomai mailing list
[email protected]
https://xenomai.org/mailman/listinfo/xenomai
