linux-kernel - Re: WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:155 inet_sock

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Message-ID: <5784BE36.8060200@free.fr>
Date:	Tue, 12 Jul 2016 11:53:58 +0200
From:	Mason <slash.tmp@...e.fr>
To:	Florian Fainelli <f.fainelli@...il.com>,
	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Cc:	Linux ARM <linux-arm-kernel@...ts.infradead.org>,
	Sebastian Frias <sf84@...oste.net>
Subject: Re: WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:155
 inet_sock_destruct+0x1c4/0x1dc

On 05/07/2016 17:28, Florian Fainelli wrote:

> Le 05/07/2016 07:50, Mason wrote:
> 
>> On 05/07/2016 15:33, Mason wrote:
>> 
>>> I was testing suspend/resume sequences where the suspend operation
>>> fails and returns without having suspended the platform.

Please forget I ever mentioned suspend, that was a red herring.
The warning is displayed even if I never suspend.
(Dropping linux-pm from this discussion.)

>> I rebooted, tried the same operation, and hit the same warning
>> still 310 seconds later:

However, the 310 seconds time span still seems to be relevant.

Steps to reproduce: I booted the system, logged in as root,
mounted an NFS file system, then left the system idling at
the prompt.

(I don't remember seeing this warning in v4.1 and v4.4)

What's going wrong here? Is it related to NFS?

Here is the defconfig I'm using
http://pastebin.ubuntu.com/19160299/

Regards.


[  317.940133] ------------[ cut here ]------------
[  317.944815] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:155 inet_sock_destruct+0x1c4/0x1dc
[  317.953223] Modules linked in:
[  317.956305] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.7.0-rc6-00010-gd07031bdc433-dirty #2
[  317.964784] Hardware name: Sigma Tango DT
[  317.968809] Backtrace: 
[  317.971279] [<c010b974>] (dump_backtrace) from [<c010bb70>] (show_stack+0x18/0x1c)
[  317.978884]  r7:60000113 r6:c080ea84 r5:00000000 r4:c080ea84
[  317.984590] [<c010bb58>] (show_stack) from [<c02e9fc4>] (dump_stack+0x80/0x94)
[  317.991856] [<c02e9f44>] (dump_stack) from [<c011bfb0>] (__warn+0xec/0x104)
[  317.998849]  r7:00000009 r6:c05e3fc8 r5:00000000 r4:00000000
[  318.004549] [<c011bec4>] (__warn) from [<c011c080>] (warn_slowpath_null+0x28/0x30)
[  318.012154]  r9:dfbea4e0 r8:0000000a r7:df45fe30 r6:dec19594 r5:df68f144 r4:df68f040
[  318.019954] [<c011c058>] (warn_slowpath_null) from [<c0463be4>] (inet_sock_destruct+0x1c4/0x1dc)
[  318.028788] [<c0463a20>] (inet_sock_destruct) from [<c03e9c40>] (__sk_destruct+0x28/0xe0)
[  318.037005]  r7:df45fe30 r6:dec19594 r5:df68f040 r4:df68f1ec
[  318.042710] [<c03e9c18>] (__sk_destruct) from [<c016f218>] (rcu_process_callbacks+0x488/0x59c)
[  318.051363]  r5:00000000 r4:00000000
[  318.054962] [<c016ed90>] (rcu_process_callbacks) from [<c01207cc>] (__do_softirq+0x138/0x264)
[  318.063527]  r10:c08020a0 r9:40000001 r8:00000101 r7:df45e000 r6:c08020a4 r5:00000009
[  318.071408]  r4:00000000
[  318.073953] [<c0120694>] (__do_softirq) from [<c0120bec>] (irq_exit+0xc8/0x104)
[  318.081296]  r10:df45ff58 r9:df402400 r8:00000001 r7:00000000 r6:00000013 r5:00000000
[  318.089176]  r4:c0735428
[  318.091723] [<c0120b24>] (irq_exit) from [<c01625f8>] (__handle_domain_irq+0x88/0xf4)
[  318.099595] [<c0162570>] (__handle_domain_irq) from [<c01014ac>] (gic_handle_irq+0x50/0x94)
[  318.107986]  r10:00000000 r9:e0803100 r8:e0802100 r7:df45ff58 r6:e080210c r5:c080277c
[  318.115865]  r4:c080eca0 r3:df45ff58
[  318.119461] [<c010145c>] (gic_handle_irq) from [<c010c694>] (__irq_svc+0x54/0x90)
[  318.126980] Exception stack(0xdf45ff58 to 0xdf45ffa0)
[  318.132053] ff40:                                                       00000001 00000000
[  318.140273] ff60: 0000ab80 c0117c80 df45e000 c08024f8 c0802494 c081e2d6 c05b9550 413fc090
[  318.148492] ff80: 00000000 df45ffb4 df45ffb8 df45ffa8 c01086b0 c01086b4 60000013 ffffffff
[  318.156709]  r9:413fc090 r8:c05b9550 r7:df45ff8c r6:ffffffff r5:60000013 r4:c01086b4
[  318.164512] [<c0108674>] (arch_cpu_idle) from [<c0155f3c>] (default_idle_call+0x28/0x34)
[  318.172646] [<c0155f14>] (default_idle_call) from [<c0156070>] (cpu_startup_entry+0x128/0x17c)
[  318.181305] [<c0155f48>] (cpu_startup_entry) from [<c010dc14>] (secondary_start_kernel+0x158/0x164)
[  318.190395]  r7:c081e7c8 r4:c080b4f0
[  318.193993] [<c010dabc>] (secondary_start_kernel) from [<8010158c>] (0x8010158c)
[  318.201423]  r5:00000051 r4:9f44006a
[  318.205024] ---[ end trace 6e04001434b19cb9 ]---


Just to be sure, I performed the same steps a second time:

[  316.238527] ------------[ cut here ]------------
[  316.243210] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:155 inet_sock_destruct+0x1c4/0x1dc
[  316.251619] Modules linked in:
[  316.254702] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.7.0-rc6-00010-gd07031bdc433-dirty #2
[  316.263182] Hardware name: Sigma Tango DT
[  316.267206] Backtrace: 
[  316.269675] [<c010b974>] (dump_backtrace) from [<c010bb70>] (show_stack+0x18/0x1c)
[  316.277280]  r7:60000113 r6:c080ea84 r5:00000000 r4:c080ea84
[  316.282986] [<c010bb58>] (show_stack) from [<c02e9fc4>] (dump_stack+0x80/0x94)
[  316.290254] [<c02e9f44>] (dump_stack) from [<c011bfb0>] (__warn+0xec/0x104)
[  316.297247]  r7:00000009 r6:c05e3fc8 r5:00000000 r4:00000000
[  316.302947] [<c011bec4>] (__warn) from [<c011c080>] (warn_slowpath_null+0x28/0x30)
[  316.310552]  r9:dfbea4e0 r8:0000000a r7:df45fe30 r6:dec15694 r5:df6063c4 r4:df6062c0
[  316.318354] [<c011c058>] (warn_slowpath_null) from [<c0463be4>] (inet_sock_destruct+0x1c4/0x1dc)
[  316.327190] [<c0463a20>] (inet_sock_destruct) from [<c03e9c40>] (__sk_destruct+0x28/0xe0)
[  316.335406]  r7:df45fe30 r6:dec15694 r5:df6062c0 r4:df60646c
[  316.341112] [<c03e9c18>] (__sk_destruct) from [<c016f218>] (rcu_process_callbacks+0x488/0x59c)
[  316.349765]  r5:00000000 r4:00000000
[  316.353363] [<c016ed90>] (rcu_process_callbacks) from [<c01207cc>] (__do_softirq+0x138/0x264)
[  316.361929]  r10:c08020a0 r9:40000001 r8:00000101 r7:df45e000 r6:c08020a4 r5:00000009
[  316.369811]  r4:00000000
[  316.372356] [<c0120694>] (__do_softirq) from [<c0120bec>] (irq_exit+0xc8/0x104)
[  316.379699]  r10:df45ff58 r9:df402400 r8:00000001 r7:00000000 r6:00000013 r5:00000000
[  316.387579]  r4:c0735428
[  316.390127] [<c0120b24>] (irq_exit) from [<c01625f8>] (__handle_domain_irq+0x88/0xf4)
[  316.397998] [<c0162570>] (__handle_domain_irq) from [<c01014ac>] (gic_handle_irq+0x50/0x94)
[  316.406388]  r10:00000000 r9:e0803100 r8:e0802100 r7:df45ff58 r6:e080210c r5:c080277c
[  316.414268]  r4:c080eca0 r3:df45ff58
[  316.417862] [<c010145c>] (gic_handle_irq) from [<c010c694>] (__irq_svc+0x54/0x90)
[  316.425382] Exception stack(0xdf45ff58 to 0xdf45ffa0)
[  316.430456] ff40:                                                       00000001 00000000
[  316.438676] ff60: 00009370 c0117c80 df45e000 c08024f8 c0802494 c081e2d6 c05b9550 413fc090
[  316.446897] ff80: 00000000 df45ffb4 df45ffb8 df45ffa8 c01086b0 c01086b4 60000013 ffffffff
[  316.455113]  r9:413fc090 r8:c05b9550 r7:df45ff8c r6:ffffffff r5:60000013 r4:c01086b4
[  316.462916] [<c0108674>] (arch_cpu_idle) from [<c0155f3c>] (default_idle_call+0x28/0x34)
[  316.471051] [<c0155f14>] (default_idle_call) from [<c0156070>] (cpu_startup_entry+0x128/0x17c)
[  316.479709] [<c0155f48>] (cpu_startup_entry) from [<c010dc14>] (secondary_start_kernel+0x158/0x164)
[  316.488799]  r7:c081e7c8 r4:c080b4f0
[  316.492395] [<c010dabc>] (secondary_start_kernel) from [<8010158c>] (0x8010158c)
[  316.499826]  r5:00000051 r4:9f44006a
[  316.503430] ---[ end trace 2dd53d8e86a1a69b ]---