From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?utf-8?q?Fran=C3=A7ois_Legal?= <devel@thom.fr.eu.org>
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Date: Thu, 20 Aug 2020 15:46:41 +0200
Subject: Strange switching =?utf-8?q?=5Bthreadname=5D?= to secondary mode
 after exception #0 in kernel-space at 0x80272444
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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 =3D rtnet=5Fget=5F=
arg(fd, &=5Fmsg, u=5Fmsg, sizeof(=5Fmsg));

If I disassemble the kernel, the failing instruction (at 0x80272444) is=
 a nop in arm=5Fcopy=5Ffrom=5Fuser
Am I doing anything wrong ?

Fran=C3=A7ois