Markus Osterried wrote: > Hello, > > with Xenomai 2.4 on Linux 2.6.18 on PowerPC I have seen the following trace: > > Feb 26 19:37:25 (none) user.err kernel: BUG: sleeping function called > from invalid context at kernel/rwsem.c:20 > Feb 26 19:37:25 (none) user.warn kernel: in_atomic():0, irqs_disabled():1 > Feb 26 19:37:25 (none) user.warn kernel: Call Trace: > Feb 26 19:37:25 (none) user.warn kernel: [C19BFE50] [C000C114] > show_stack+0x58/0x188 (unreliable) > Feb 26 19:37:25 (none) user.warn kernel: [C19BFEA0] [C00128B0] > __might_sleep+0xdc/0xf0 > Feb 26 19:37:25 (none) user.warn kernel: [C19BFEC0] [C0032304] > down_read+0x24/0x58 > Feb 26 19:37:25 (none) user.warn kernel: [C19BFED0] [C00192C8] > exit_mm+0x34/0xec > Feb 26 19:37:25 (none) user.warn kernel: [C19BFEF0] [C001B000] > do_exit+0x21c/0x98c > Feb 26 19:37:25 (none) user.warn kernel: [C19BFF30] [C001B810] > complete_and_exit+0x0/0x28 > Feb 26 19:37:25 (none) user.warn kernel: [C19BFF40] [C00041A0] > ret_from_syscall+0x0/0x38 > > > This happens (sometimes) when a pSOS-task exits by returning from its > main function. > I have changed the return statement into t_delete(0) and there was no > error anymore, so this isn't a major issue. > > But anyway I would like to know whether this is a xenomai bug or it > isn't allowed to exit a pSOS-task by returning from main function. > I have seen at end of psos_task_trampoline that there is a > pthread_exit() instead of a t_delete(). >
It is allowed to exit the task body directly. Another possibility is a bug in old Adeos/ppc patch for 2.6.18, that would trigger when the nucleus has to relax the exiting thread. Anyway, this issue is queued for investigation here. Thanks. PS: you may want to check whether forcing the task to secondary mode before calling t_delete(0) does not cause the issue to trigger again. > Thanks > Markus > > > > ------------------------------------------------------------------------ > > _______________________________________________ > Xenomai-core mailing list > Xenomai-core@gna.org > https://mail.gna.org/listinfo/xenomai-core -- Philippe. _______________________________________________ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
