Date:	Wed, 21 Oct 2015 09:03:06 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	netdev@...r.kernel.org
Subject: Fw: [Bug 106361] New: Kernel bug: Thread aborts unexpectedly when
 sending UDP message



Begin forwarded message:

Date: Tue, 20 Oct 2015 15:20:24 +0000
From: "bugzilla-daemon@...zilla.kernel.org" <bugzilla-daemon@...zilla.kernel.org>
To: "shemminger@...ux-foundation.org" <shemminger@...ux-foundation.org>
Subject: [Bug 106361] New: Kernel bug: Thread aborts unexpectedly when sending UDP message


https://bugzilla.kernel.org/show_bug.cgi?id=106361

            Bug ID: 106361
           Summary: Kernel bug: Thread aborts unexpectedly when sending
                    UDP message
           Product: Networking
           Version: 2.5
    Kernel Version: 3.3.0
          Hardware: ARM
                OS: Linux
              Tree: PREEMPT_RT
            Status: NEW
          Severity: high
          Priority: P1
         Component: IPV4
          Assignee: shemminger@...ux-foundation.org
          Reporter: luckythree999@....com
        Regression: No

I run into a kernel bug at ARM Linux, during UDP usage with our application
(ENB03_BPU_APP_1) with Multithreading.
In my application, One Thread aborts unexpectedly when sending UDP message.
And I am repeatedly getting this, and it will happen within 3-12 hours of
running on a system doing primarily only UDP send/receive activity.


1> And Environment :
   1.1> root@...6614-evm:~# uname -a
    Linux tci6614-evm 3.3.0-dirty #20 PREEMPT Mon May 19 14:50:04 CST 2014
armv7l unknown

   1.2> root@...6614-evm:~# cat /proc/version 
    Linux version 3.3.0-dirty (root@...t-desktop) (gcc version 4.3.3 (Sourcery
G++ Lite 2009q1-203) ) #20 PREEMPT Mon May 19 14:50:04 CST 2014



2>  This is the stack trace:
.................................................................................................................
skb_under_panic: text:c0269e24 len:392 put:14 head:d3cea000 data:d3ce9ff4
tail:0xd3cea17c end:0xd3cea340 dev:eth0
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:147!
Internal error: Oops - BUG: 0 [#1] PREEMPT
Modules linked in: drv_fpga_module(O)
CPU: 0    Tainted: G           O  (3.3.0-dirty #20)
PC is at skb_push+0x7c/0x84
LR is at skb_push+0x7c/0x84
pc : [<c02496f0>]    lr : [<c02496f0>]    psr: 60000013
sp : d4afbc28  ip : c04c7770  fp : d62f2a54
r10: 00000000  r9 : d62f2a50  r8 : d6008800
r7 : d3cea000  r6 : d3ce9ff4  r5 : d3cea340  r4 : d6008800
r3 : 20000093  r2 : 60000013  r1 : 60000013  r0 : 00000078
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 10c5387d  Table: 94960019  DAC: 00000015
Process ENB03_BPU_APP_1 (pid: 1117, stack limit = 0xd4afa2e8)
Stack: (0xd4afbc28 to 0xd4afc000)
bc20:                   d3cea000 d3ce9ff4 d3cea17c d3cea340 d6008800 d3cea002
bc40: d604c908 00000800 d6325a80 00000000 d62f2a54 c0269e24 d62f2a00 d6325a80
bc60: 0000156c 0000017a d6008800 c0260160 00000000 0000017a c02884bc 0000016c
bc80: d6325a80 d62f2a00 d62be900 d6325a80 00000000 d4901e40 0000000e c028b2c0
bca0: d6008800 d6325a80 d6325a80 d4afbd8c d62be900 00000000 d6325a80 00000158
bcc0: d4afbd8c c028a678 d3cea024 c028a684 d3cea024 c02aaef4 00000000 00000158
bce0: d4afbf5c d62be900 00000150 00000000 d6325a80 00000000 d4afbd8c c02ad378
bd00: 00000158 00000008 d4afbdac d4afbdbc 00000000 c01e07d0 00000001 d4afbdac
bd20: 00000000 00000000 00000000 3232a8c0 3232a8c0 d2e6a8c0 00003930 00000000
bd40: c0289af0 d62beaa8 00000000 00000000 00000000 00000000 00000000 d4afbdc0
bd60: 00000001 d5c9e108 d4afbf74 00000001 00000001 c018c0ac 00000000 d63e6a40
bd80: 00000000 d63e6a40 00000001 00000000 00000000 00000000 04110000 00000000
bda0: d2e6a8c0 3232a8c0 44e03930 3232a8c0 00000000 00000000 00000000 00000000
bdc0: 00000003 d62be900 d4afbe00 d4afbf5c 00000150 d4afbe00 d4afa000 00000010
bde0: 7b26cc44 c02b40a0 00000000 00000000 d64f1480 00000150 d4afbe00 c02416a4
be00: 00000000 fffffffe 00000000 00000001 ffffffff 00000000 00000000 00000000
be20: 00000000 00000000 d78a7500 c0053244 00000000 00000000 d78a7500 d78a7500
be40: d4afbe80 d5d5c000 d5d5c000 d5d5c000 d4afbeec c035f314 d5d6bf38 d4afbf30
be60: c04c9b94 00000000 c04dd658 c04c5144 c04be38c c036a8fc c04be0ec c04ca508
be80: d4afbf30 c0049d34 00000000 00000150 d64f1480 c004a2d8 00000000 d4afbf5c
bea0: d4afbf80 00000000 008364f4 d64f1480 d4afbedc 00000000 008364f4 d4afbedc
bec0: 00000150 d64f1480 d4afbedc 00000000 008364f4 c0241dec 004c4b40 39300002
bee0: 3232a8c0 00000000 00000000 c035eac8 00000000 00000001 004c4b40 00000000
bf00: 00000000 00000000 00000000 00000000 00000001 c004a47c 00000000 00000000
bf20: c04f1fb8 00000000 004c4b40 00000000 d4afbf31 00000000 00000000 00000000
bf40: 9a4359e0 000007db 9a4359e0 000007db c00499ac c04c9b88 00000000 d4afbedc
bf60: 00000010 d4afbf78 00000001 00000000 00000000 00000000 9a252ae8 00000150
bf80: 00000001 00000000 7b26dc8c 008364f4 00000010 00397a08 00000122 c0013bc8
bfa0: 00000000 c0013a20 008364f4 00000010 0000000a 9a252ae8 00000150 00000000
bfc0: 008364f4 00000010 00397a08 00000122 003d0f00 beb76bd8 00000000 7b26cc44
bfe0: 00000000 7b26cc10 00399f58 0039acf4 80000010 0000000a 00000000 00000000
[<c02496f0>] (skb_push+0x7c/0x84) from [<c0269e24>] (eth_header+0x1c/0xb8)
[<c0269e24>] (eth_header+0x1c/0xb8) from [<c0260160>]
(neigh_resolve_output+0x13c/0x1ac)
[<c0260160>] (neigh_resolve_output+0x13c/0x1ac) from [<c028b2c0>]
(ip_finish_output+0x238/0x30c)
[<c028b2c0>] (ip_finish_output+0x238/0x30c) from [<c028a678>]
(ip_local_out+0x28/0x2c)
[<c028a678>] (ip_local_out+0x28/0x2c) from [<c028a684>] (ip_send_skb+0x8/0x58)
[<c028a684>] (ip_send_skb+0x8/0x58) from [<c02aaef4>] (udp_send_skb+0xe4/0x34c)
[<c02aaef4>] (udp_send_skb+0xe4/0x34c) from [<c02ad378>]
(udp_sendmsg+0x634/0x750)
[<c02ad378>] (udp_sendmsg+0x634/0x750) from [<c02b40a0>]
(inet_sendmsg+0x4c/0x6c)
[<c02b40a0>] (inet_sendmsg+0x4c/0x6c) from [<c02416a4>]
(sock_sendmsg+0x98/0xb8)
[<c02416a4>] (sock_sendmsg+0x98/0xb8) from [<c0241dec>] (sys_sendto+0xb4/0xd8)
[<c0241dec>] (sys_sendto+0xb4/0xd8) from [<c0013a20>]
(ret_fast_syscall+0x0/0x30)
Code: e98d4040 e58d500c e58d4010 eb045164 (e7f001f2) 
---[ end trace cfb1d2ec7e84e37e ]---
..............................................................................................................

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