Christoph Permes wrote: > Am Mittwoch, den 26.08.2009, 10:12 +0200 schrieb Gilles Chanteperdrix: >> Christoph Permes wrote: >>> Hi, >>> >>> I'm using rt_printf for debug output. When running tests for 20 hours or >>> longer, sometimes I get a segmentation fault. >>> >>> The backtrace shows: >>> #0 0xb7d008d8 in fputs () from /lib/libc.so.6 >>> #1 0xb7f26f61 in print_buffers () from /usr/xenomai/lib/librtdk.so.0 >>> #2 0xb7f26fb3 in printer_loop () from /usr/xenomai/lib/librtdk.so.0 >>> #3 0xb7c92f3b in start_thread () from /lib/libpthread.so.0 >>> #4 0xb7d6fb6e in clone () from /lib/libc.so.6 >>> >>> It seems to me that there is a bug in the print thread. >>> >>> My program runs on x86 using the following software versions: >>> Kernel 2.6.29.5 >>> Xenomai 2.4.9 >>> I-Pipe patch: adeos-ipipe-2.6.29.5-x86-2.4-02.patch >> Could you try the following patch? >> >> diff --git a/src/rtdk/rt_print.c b/src/rtdk/rt_print.c >> index 0615247..a0aeec3 100644 >> --- a/src/rtdk/rt_print.c >> +++ b/src/rtdk/rt_print.c >> @@ -422,6 +422,7 @@ void __rt_print_init(void) >> pthread_attr_t thattr; >> const char *value_str; >> unsigned long long period; >> + unsigned stksize; >> >> first_buffer = NULL; >> seq_no = 0; >> @@ -457,6 +458,9 @@ void __rt_print_init(void) >> pthread_cond_init(&printer_wakeup, NULL); >> >> pthread_attr_init(&thattr); >> - pthread_attr_setstacksize(&thattr, PTHREAD_STACK_MIN); >> + stksize = 32768; >> + if (stksize < PTHREAD_STACK_MIN) >> + stksize = PTHREAD_STACK_MIN; >> + pthread_attr_setstacksize(&thattr, stksize); >> pthread_create(&printer_thread, &thattr, printer_loop, NULL); >> } >> > > I have tried the patch but it crashed again with the same backtrace.
Could you try to find out, what memory access is precisely causing the SEGV? Maybe even what variables of the rt_printf code have invalid states? Or do you have a portable test case for us to reproduce the issue? Thanks, Jan -- Siemens AG, Corporate Technology, CT SE 2 Corporate Competence Center Embedded Linux _______________________________________________ Xenomai-help mailing list [email protected] https://mail.gna.org/listinfo/xenomai-help
