[Xenomai] Xenomai 3.0.3 is broken in my system (was Regarding Xenomai and RTNET)

[Leopold Palomo-Avellaneda <leo@alaxarxa.net>]

Hi,

I have been making some tests and I have arrived to the conclusion that the PC 
that I would like to install Xenomai and RTNET doesn't like it.

It's a PC with a motherboard Gigabyte Q170M-D3H-CF. I'm running 4.1.18 with 
xenomai 3.0.3. AFAIK, the xenomai tests works. However, when I try to run 
RTNET, I got crashes:

BUG: unable to handle kernel paging request at 00007f47ea0ef878
 IP: [<ffffffffa0231580>] rt_udp_ioctl+0x50/0x74 [rtudp]
 PGD 458887067 PUD 4590a1067 PMD 45921f067 PTE 8000000438863867
 Oops: 0001 [#1] PREEMPT SMP 
 Modules linked in: rt_igb rt_loopback rtcfg rtudp rtipv4 rtmac rtpacket rtnet 
e100 mii ctr ccm binfmt_misc nfsd
 CPU: 4 PID: 6773 Comm: LWRJointPositio Not tainted 4.1.18-xenomai-3.0.3 #1
 Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./Q170M-D3H-
CF, BIOS F1 10/13/2015
 task: ffff880459a26010 ti: ffff880459a38000 task.ti: ffff880459a38000
 RIP: 0010:[<ffffffffa0231580>]  [<ffffffffa0231580>] rt_udp_ioctl+0x50/0x74 
[rtudp]
 RSP: 0018:ffff880459a3be08  EFLAGS: 00010246
 RAX: 00007f47ea0ef870 RBX: ffff880458d59400 RCX: ffff880458d59440
 RDX: 0000000000000000 RSI: 0000000040100022 RDI: ffff880458d59400
 RBP: 0000000000000003 R08: ffff880460297420 R09: 000000000000004e
 R10: 00000000000000dc R11: ffff880459a3bdc0 R12: ffff880459a26010
 R13: ffffc90001f05008 R14: 0000000040100022 R15: ffffffff81b85ec0
 FS:  00007f47ea0f0700(0000) GS:ffff880460200000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
 CR2: 00007f47ea0ef878 CR3: 000000045890c000 CR4: 00000000003406e0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
 I-pipe domain Linux
 Stack:
  ffffffffa0231535 ffffffff8116fb70 ffff880459a265c0 00007f47ea0ef870
  ffff8804599975d0 0000000000000010 ffff880459a3beb8 ffff880459a3be48
  0000000000000002 ffff880459a26010 00007f47ea0ef870 ffff880459a26010
 Call Trace:
  [<ffffffffa0231535>] ? rt_udp_ioctl+0x5/0x74 [rtudp]
  [<ffffffff8116fb70>] ? rtdm_fd_ioctl+0x100/0x270
  [<ffffffff81174b40>] ? CoBaLt_fcntl+0x20/0x20
  [<ffffffff81174b40>] ? CoBaLt_fcntl+0x20/0x20
  [<ffffffff81174b50>] ? CoBaLt_ioctl+0x10/0x20
  [<ffffffff81174b45>] ? CoBaLt_ioctl+0x5/0x20
  [<ffffffff8118450a>] ? ipipe_syscall_hook+0x11a/0x360      
  [<ffffffff81108da7>] ? __ipipe_notify_syscall+0xe7/0x1d0   
  [<ffffffff81107185>] ? __ipipe_restore_root_nosync+0x5/0x30
  [<ffffffff8158fb34>] ? pipeline_syscall+0x9/0x16
 Code: 23 00 10 40 75 15 8b 50 08 48 8b 30 48 89 cf 48 83 c4 08 e9 a3 fd ff ff 
0f 1f 00 48 89 c2 48 83 c4 08 e9 5
 RIP  [<ffffffffa0231580>] rt_udp_ioctl+0x50/0x74 [rtudp]
  RSP <ffff880459a3be08>
 CR2: 00007f47ea0ef878
 ---[ end trace 085d23e71de3ae4b ]---


The funny (or ugly thing) is that, same kernel (I'm using debian packages) and 
almost the same Xenomai (compiled in each machine but with the same configure 
options) works in another similar box, with the same network cards (rt_igb). 
My application doesn't crash.

I also have tested another network card (rt_e1000_new) with the same core 
dump.

So, any idea how can I find some light in this? I don't know if it's a rtnet 
issue of a combination of kernel and hardware issue.

Best regards,

Leopold


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