Hello!
We are having trouble with "Illegal instruction" (illegal opcode) crashes
(dumping core) of two different Xenomai programs on different computers,
occuring approximately once every few days. Here are some perhaps relevant
details...
Linux kernel version: 2.6.34
/proc/xenomai/version: 2.5.6
/opt/eldk/xenomai-2.5.6/bin/xeno-config --version: 2.5.6
CPU: MPC5200
First program
name: eclr
link command (expanded): /pecom/eldk4.2/usr/bin/ppc_6xx-g++ -o eclr.neu
./app_eclr_pdd_support.o ./DriverLib-cli.o ./DriverLib.o ./eclrEnvironment.o
./eclrImageFile.o ./eclr_main.o ./ErrorLib.o ./linuxfile.o
./PecomLib_V1_3-cli.o ./PecomLib_V1_3.o ./ShmLib-cli.o ./ShmLib.o
./Standard_FB-cli.o ./Standard_FB.o ./threadimpl.o ./userapp.o ./ethcomm.o
./ibusdrv.o ./ipc.o ./meld.o ./ocm.o ./proconcompat.o ./rw_konfig.o
./copy64.o -Wl,@/res4/Linux/eldk4.2/xenomai-2.5.6/lib/posix.wrappers
-L/res4/Linux/eldk4.2/xenomai-2.5.6/lib -lpthread_rt -lxenomai -lpthread -lrt
-lnative -L/res4/Linux/eldk4.2/xenomai-2.5.6/lib -lxenomai -lpthread -L.
-leclrlib libxproc.a sub/loglib.so -Lsub -lpsosu -lxenou -lrtdk -lrtdm
gdb output (extract):
Core was generated by `eclr'.
Program terminated with signal 4, Illegal instruction.
#0 0x0ffef8ec in pthread_setcanceltype@plt () from
/usr/lib/xenomai/libpthread_rt.so.1
(gdb) bt full
#0 0x0ffef8ec in pthread_setcanceltype@plt () from
/usr/lib/xenomai/libpthread_rt.so.1
No symbol table info available.
#1 0x0ffa4700 in pthread_wait_np (overruns_r=0xbfe92924) at thread.c:326
err = 0
oldtype = 0
#2 0x10007000 in main ()
No symbol table info available.
(gdb) x/i $pc
=> 0xffef8ec <pthread_setcanceltype@plt>: b 0xff1b868
<pthread_setcanceltype>
(gdb) x/i 0xff1b868
0xff1b868 <pthread_setcanceltype>: cmplwi cr7,r3,1
Second program
name: ibsyncer
link command (expanded): /opt/elinos/cdk/ppc/60x/glibc-2.3.2/bin/ppc_60x-gcc
-idirafter sub -idirafter . -I../../phoenix_ddi/inc/usr
-I/res4/Linux/eldk3.1.1/xenomai-2.5.6/include -D_GNU_SOURCE -D_REENTRANT -Wall
-pipe -D__XENO__ -lnative -L/res4/Linux/eldk3.1.1/xenomai-2.5.6/lib -lxenomai
-lpthread ibsyncer.o -o ibsyncer.tmp sub/libpsosu.so -lnative -lrtdm
gdb output (extract):
Core was generated by `ibsyncer'.
Program terminated with signal 4, Illegal instruction.
#0 0x0ffefba8 in pthread_setcanceltype@plt () from
/usr/lib/xenomai/libnative.so.3
(gdb) bt
#0 0x0ffefba8 in pthread_setcanceltype@plt () from
/usr/lib/xenomai/libnative.so.3
#1 0x0ffadfdc in rt_task_sleep (delay=10000000) at task.c:322
#2 0x10002030 in copy (i=0x10000) at sub/ibsyncer.c:78
#3 0x0fface6c in rt_task_trampoline (cookie=0x1) at task.c:109
#4 0x0ff187d4 in ?? () from /lib/libpthread.so.0
#5 0x0fe20334 in clone () from /lib/libc.so.6
(gdb) x/i $pc
=> 0xffefba8 <pthread_setcanceltype@plt+4>: b 0xffef9dc
(gdb) x/i 0xffef9dc
0xffef9dc: rlwinm r12,r11,1,0,30
(gdb) x/i $pc-4
0xffefba4 <pthread_setcanceltype@plt>: b 0xff1f868
<pthread_setcanceltype>
(gdb) x/i 0xff1f868
0xff1f868 <pthread_setcanceltype>: cmplwi cr7,r3,1
(gdb) x/i 0x0ffadfdc-4
0xffadfd8 <rt_task_sleep+228>: bl 0xffefba4
<pthread_setcanceltype@plt>
So, the two cases look somewhat similar: The "Illegal instruction" is reported
around pthread_setcanceltype@plt; there are legal branch instructions there as
well as at the branch target locations; pthread_setcanceltype@plt is called
from timed wait functions (pthread_wait_np() and rt_task_sleep() resp.).
We would be grateful for suggestions how to analyze and cure the problem.
--
Best regards,
Dietmar Schindler
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