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From: Hannes Frederic Sowa <hannes@stressinduktion.org>
To: Koehrer Mathias <mathias.koehrer@etas.com>, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org
Cc: e1000-devel@lists.sourceforge.net
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Subject: Re: PROBLEM: [x86] Running ptpd2 using an Intel 82572EI (e1000e) leads
 to a kernel oops (3.12.26)
Date: Wed, 06 Aug 2014 11:29:27 +0200
In-Reply-To: <50f83e65cecd4882b22887858bfdf484@FE-MBX1012.de.bosch.com>
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[added e1000-devel]

Hi,

On Mon, Aug 4, 2014, at 14:26, Koehrer Mathias (ETAS/ESW5) wrote:
> [1.] One line summary of the problem: 
> Running ptpd2 using an Intel 82572EI (e1000e) leads to a kernel oops
> (3.12.26)
> 
> [2.] Full description of the problem/report:
> I run the PTP daemon ptpd2 (http://ptpd.sourceforge.net/), version 2.3.1
> on a x86 PC using an Intel 82572EI NIC (driver e1000e).
> The ptpd2 is started as
> ptpd2 -i eth0 --masteronly --foreground --verbose
> I have another PC in the same network that is running the PTP slave.
> After a couple of seconds the kernel generates an Oops.
> 
> Using a different network adapter works fine.
> 
> Thanks for any support on this!
> 
> [3.] Keywords (i.e., modules, networking, kernel):
> PTP, networking, e1000e
> 
> [4.] Kernel information
> 
> [4.1.] Kernel version (from /proc/version):
> Linux version 3.12.26-4 (user@rtpc) (gcc version 4.7.2 (Debian 4.7.2-5) )
> #1 SMP PREEMPT Mon Aug 4 11:04:11 CEST 2014
> 
> [4.2.] Kernel .config file:
> [...]

> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 5358 at kernel/workqueue.c:1386
> __queue_work+0x18f/0x300()
> Modules linked in: e100 mii e1000 nfsd exportfs nfs lockd sunrpc igb
> i2c_algo_bit i2c_core dca bridge stp llc e1000e smsc47b397 coretemp
> kvm_intel kvm usb_storage tg3 psmouse ptp pps_core libphy ehci_pci pcspkr
> processor parport_pc parport thermal_sys hwmon reiserfs sg sr_mod sd_mod
> cdrom ahci libahci microcode uhci_hcd ehci_hcd
> CPU: 0 PID: 5358 Comm: ptpd2 Not tainted 3.12.26-4 #1
> Hardware name: Hewlett-Packard HP xw4600 Workstation/0AA0h, BIOS 786F3
> v01.13 06/25/2008
>  00000000 00000000 f48dfad4 c07b2d07 00000000 f48dfb04 c0440e64 c08ee514
>  00000000 000014ee c08f4e3c 0000056a c045775f c045775f f5877100 f501f900
>  f5875e80 f48dfb14 c0440ea2 00000009 00000000 f48dfb48 c045775f f48dfb34
> Call Trace:
>  [<c07b2d07>] dump_stack+0x4b/0x79
>  [<c0440e64>] warn_slowpath_common+0x84/0xa0
>  [<c045775f>] ? __queue_work+0x18f/0x300
>  [<c045775f>] ? __queue_work+0x18f/0x300
>  [<c0440ea2>] warn_slowpath_null+0x22/0x30
>  [<c045775f>] __queue_work+0x18f/0x300
>  [<c045795d>] queue_work_on+0x3d/0x50
>  [<f9f806e5>] schedule_work+0x15/0x20 [e1000e]
>  [<f9f845ba>] e1000_xmit_frame+0xc4a/0xcb0 [e1000e]

Quick analysis so far:
Looks like the socket enabled hw timestamping but the network card (from
the lspci output below) is not capable of hw timestamping. queue_work
thus gets fed an uninitialized work struct and bails out here.

>  [<c07368bb>] ? harmonize_features+0x2b/0x1d0
>  [<c0737033>] dev_hard_start_xmit+0x2c3/0x560
>  [<c0724e61>] ? sock_alloc_send_pskb+0x161/0x380
>  [<c074d602>] sch_direct_xmit+0xa2/0x190
>  [<c0737454>] dev_queue_xmit+0x184/0x410
>  [<c075f7c1>] ip_finish_output+0x1f1/0x3c0
>  [<c076036f>] ip_mc_output+0x8f/0x140
>  [<c075fd60>] ip_local_out+0x20/0x30
>  [<c0760e4a>] ip_send_skb+0x1a/0x80
>  [<c078395a>] udp_send_skb+0x1fa/0x280
>  [<c0783ce3>] udp_sendmsg+0x2a3/0x8b0
>  [<c075e350>] ? ip_setup_cork+0xf0/0xf0
>  [<c0472cf1>] ? dequeue_task_fair+0x211/0x660
>  [<c046fa68>] ? __enqueue_entity+0x78/0x80
>  [<c078d3d0>] inet_sendmsg+0x70/0xa0
>  [<c07213e2>] sock_sendmsg+0x62/0xa0
>  [<c05c67b5>] ? _copy_from_user+0x35/0x50
>  [<c0721991>] SYSC_sendto+0xf1/0x130
>  [<c044ed4a>] ? ptrace_do_notify+0x8a/0xa0
>  [<c0721f5d>] SyS_sendto+0x2d/0x30
>  [<c0722908>] SyS_socketcall+0x1c8/0x300
>  [<c07b848f>] syscall_call+0x7/0x7
> ---[ end trace d87b1e283af6ddc9 ]---
> [7.] A small shell script or example program which triggers the
>      problem (if possible)
> ptpd2 -i eth0 --masteronly --foreground --verbose
> 

> 34:00.0 Ethernet controller: Intel Corporation 82572EI Gigabit Ethernet
> Controller (Copper) (rev 06)

Bye,
Hannes