From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Fri, 12 Jun 2020 10:33:28 -0500 (CDT)
From: Per Oberg <pero@wolfram.com>
Message-ID: <182301543.23100.1591976008769.JavaMail.zimbra@wolfram.com>
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References: <1293572894.22066.1591975586278.JavaMail.zimbra@wolfram.com>
Subject: Re: Exception #14 in kernel space when using rttcp
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----- Den 12 jun 2020, p=C3=A5 kl 17:26, xenomai xenomai@xenomai.org skrev:

> Hi list

> I get a massive amount of "swithching ... to secondary mode after excepti=
on #14
> in kernel-space ..." followed by a WARNING as shown below.

> Can someone enlighten me regarding the meaning of exception #14 ?

Is this an illegal page-fault in kernel space? Are these numbers the same a=
s for the standard kernel?

> Is the "WARNING: CPU: 0 ..." the cause or the symptom ? It has a macro at=
 fd.c
> calling "XENO_WARN_ON(COBALT, fd->refs <=3D 0);

> This is for Xenomai 3.1

> [ 133.458856] [Xenomai] switching RTTest to secondary mode after exceptio=
n #14
> in kernel-space at 0xffffffff8145386e (pid 498)
> [ 133.461217] ------------[ cut here ]------------
> [ 133.461218] WARNING: CPU: 0 PID: 199 at
> /usr/src/kernel/kernel/xenomai/rtdm/fd.c:299 __put_fd+0x242/0x290
> [ 133.461218] Modules linked in: rttcp rtudp rtipv4 intel_powerclamp inte=
l_rapl
> coretemp i915 e1000e rt_igb pcan(O) rtnet video fan thermal_sys
> [ 133.461225] CPU: 0 PID: 199 Comm: rtnet-stack Tainted: G O 4.9.90-xeno-=
cobolt
> #1
> [ 133.461226] Hardware name: Default string Default string/SKYBAY, BIOS 5=
.0.1.1
> 04/18/2016
> [ 133.461226] I-pipe domain: Xenomai
> [ 133.461227] ffffc90000947d20 ffffffff81446d18 0000000000000000
> 0000000000000000
> [ 133.461229] ffffffff81bb13f0 ffffc90000947d60 ffffffff81078461
> 0000012b00000001
> [ 133.461231] 0000000000000000 0000000000000000 ffff88026194d000
> 0000000000000000
> [ 133.461233] Call Trace:
> [ 133.461234] [<ffffffff81446d18>] dump_stack+0xbf/0xe7
> [ 133.461234] [<ffffffff81078461>] __warn+0xe1/0x100
> [ 133.461235] [<ffffffff8107854d>] warn_slowpath_null+0x1d/0x20
> [ 133.461235] [<ffffffff811711e2>] __put_fd+0x242/0x290
> [ 133.461236] [<ffffffffa00bae46>] ? rtskb_pool_queue_tail+0xa6/0xd0 [rtn=
et]
> [ 133.461236] [<ffffffff81171ff6>] rtdm_fd_unlock+0x96/0xc0
> [ 133.461237] [<ffffffffa02ed725>] rt_ip_rcv+0x135/0x170 [rtipv4]
> [ 133.461237] [<ffffffffa00bc008>] rt_stack_deliver+0xf8/0x220 [rtnet]
> [ 133.461238] [<ffffffff8115fd20>] ? xnthread_map+0x330/0x330
> [ 133.461238] [<ffffffffa00bc1a0>] rt_stack_mgr_task+0x70/0xa0 [rtnet]
> [ 133.461239] [<ffffffff8115fd93>] kthread_trampoline+0x73/0x120
> [ 133.461240] [<ffffffff810967a9>] kthread+0xd9/0xf0
> [ 133.461240] [<ffffffff810966d0>] ? kthread_park+0x60/0x60
> [ 133.461241] [<ffffffff81001c92>] ? do_syscall_64+0x82/0xf0
> [ 133.461241] [<ffffffff818e0255>] ret_from_fork+0x55/0x60
> [ 133.461242] ---[ end trace c5197a4d8608bef3 ]---

> Per =C3=96berg

Thanks
Per =C3=96berg=20