Le Vendredi, Août 21, 2020 20:04 CEST, Jan Kiszka <[email protected]> a écrit:
> On 20.08.20 15:46, François Legal via Xenomai wrote: > > Using RTNet with multiple interfaces, xenomai 3.1 with linux 4.4 > > Whenever a posix RT thread calls recvmsg (), I get this error. > > > > I could track this down to line 422 in udp.c : msg = rtnet_get_arg(fd, > > &_msg, u_msg, sizeof(_msg)); > > > > If I disassemble the kernel, the failing instruction (at 0x80272444) is a > > nop in arm_copy_from_user > > Am I doing anything wrong ? > > Maybe you are passing an invalid pointer to recvmsg, directly or in its > message structures. That would cause an exception which is fixed up but > also reported. Do you get an error in return? > So, I checked, and the same happens on calls to sendto (). I doubt the pointer passed is invalid, as I don't get that kind of problems with 3.0.9. Upon return from recvmsg or sendto, I get -1 with errno set to 14. Also, I checked in ipipe_base.h, exception #0 seem to be an instruction/data access exception, which seems very weird to me for a NOP instruction that does not appear to be on a line/page boundary. François > Jan > > -- > Siemens AG, Corporate Technology, CT RDA IOT SES-DE > Corporate Competence Center Embedded Linux
