linux-kernel - Re: WARNING: CPU: 1 PID: 813 at kernel/module.c:291 module_assert_mutex_or

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Date:	Fri, 21 Aug 2015 06:53:36 -0700
From:	Laura Abbott <labbott@...hat.com>
To:	poma <pomidorabelisima@...il.com>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-media <linux-media@...r.kernel.org>
Subject: Re: WARNING: CPU: 1 PID: 813 at kernel/module.c:291
 module_assert_mutex_or_preempt+0x49/0x90()

On 08/21/2015 03:21 AM, poma wrote:
> On 10.08.2015 23:26, poma wrote:
>>
>> ------------[ cut here ]------------
>> WARNING: CPU: 1 PID: 813 at kernel/module.c:291 module_assert_mutex_or_preempt+0x49/0x90()
>> Modules linked in: mxl5007t af9013 ... dvb_usb_af9015(+) ... dvb_usb_v2 dvb_core rc_core ...
>> CPU: 1 PID: 813 Comm: systemd-udevd Not tainted 4.2.0-0.rc6.git0.1.fc24.x86_64+debug #1
>> ...
>> Call Trace:
>>   [<ffffffff81868d8e>] dump_stack+0x4c/0x65
>>   [<ffffffff810ab406>] warn_slowpath_common+0x86/0xc0
>>   [<ffffffffa057d0b0>] ? af9013_read_ucblocks+0x20/0x20 [af9013]
>>   [<ffffffffa057d0b0>] ? af9013_read_ucblocks+0x20/0x20 [af9013]
>>   [<ffffffff810ab53a>] warn_slowpath_null+0x1a/0x20
>>   [<ffffffff81150529>] module_assert_mutex_or_preempt+0x49/0x90
>>   [<ffffffff81150822>] __module_address+0x32/0x150
>>   [<ffffffffa057d0b0>] ? af9013_read_ucblocks+0x20/0x20 [af9013]
>>   [<ffffffffa057d0b0>] ? af9013_read_ucblocks+0x20/0x20 [af9013]
>>   [<ffffffff81150956>] __module_text_address+0x16/0x70
>>   [<ffffffffa057d0b0>] ? af9013_read_ucblocks+0x20/0x20 [af9013]
>>   [<ffffffffa057d0b0>] ? af9013_read_ucblocks+0x20/0x20 [af9013]
>>   [<ffffffff81150f19>] symbol_put_addr+0x29/0x40
>>   [<ffffffffa04b77ad>] dvb_frontend_detach+0x7d/0x90 [dvb_core]
>>   [<ffffffffa04cdfd5>] dvb_usbv2_probe+0xc85/0x11a0 [dvb_usb_v2]
>>   [<ffffffffa05607c4>] af9015_probe+0x84/0xf0 [dvb_usb_af9015]
>>   [<ffffffff8161c03b>] usb_probe_interface+0x1bb/0x2e0
>>   [<ffffffff81579f26>] driver_probe_device+0x1f6/0x450
>>   [<ffffffff8157a214>] __driver_attach+0x94/0xa0
>>   [<ffffffff8157a180>] ? driver_probe_device+0x450/0x450
>>   [<ffffffff815778f3>] bus_for_each_dev+0x73/0xc0
>>   [<ffffffff815796fe>] driver_attach+0x1e/0x20
>>   [<ffffffff8157922e>] bus_add_driver+0x1ee/0x280
>>   [<ffffffff8157b0a0>] driver_register+0x60/0xe0
>>   [<ffffffff8161a87d>] usb_register_driver+0xad/0x160
>>   [<ffffffffa0567000>] ? 0xffffffffa0567000
>>   [<ffffffffa056701e>] af9015_usb_driver_init+0x1e/0x1000 [dvb_usb_af9015]
>>   [<ffffffff81002123>] do_one_initcall+0xb3/0x200
>>   [<ffffffff8124ac65>] ? kmem_cache_alloc_trace+0x355/0x380
>>   [<ffffffff81867c37>] ? do_init_module+0x28/0x1e9
>>   [<ffffffff81867c6f>] do_init_module+0x60/0x1e9
>>   [<ffffffff81154167>] load_module+0x21f7/0x28d0
>>   [<ffffffff8114f600>] ? m_show+0x1b0/0x1b0
>>   [<ffffffff81026d79>] ? sched_clock+0x9/0x10
>>   [<ffffffff810e6ddc>] ? local_clock+0x1c/0x20
>>   [<ffffffff811549b8>] SyS_init_module+0x178/0x1c0
>>   [<ffffffff8187282e>] entry_SYSCALL_64_fastpath+0x12/0x76
>> ---[ end trace 31a9dd90d4f559f5 ]---
>>
>>
>> Ref.
>> https://bugzilla.redhat.com/show_bug.cgi?id=1252167
>> https://bugzilla.kernel.org/show_bug.cgi?id=102631
>>
>
> You guys are really something.
>
> First of all, as is evident here, I am the original reporter, not Laura Abbott <labbott@...hat.com>.
> -All- your comments including the final patch on this issue, are just plain wrong.[1]
> This patch only hides the actual problem with this particular device - the dual tuner combination driven by dvb_usb_af9015 & mxl5007t, broken by design since day one.
>
> Read the entire https://bugzilla.redhat.com/show_bug.cgi?id=1252167
> and stop this nonsense.
>
> NACK "module: Fix locking in symbol_put_addr()"
>
> [1] http://www.gossamer-threads.com/lists/linux/kernel/2241154
>
>

Sorry, I've been delayed with conferences and have been avoiding e-mails and bugzilla.
I missed sending out the Tested-by tag.
You are welcome to drop the reported-by if you don't think it is appropriate.

Laura
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