linux-kernel - Re: general protection fault vs Oops

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Message-ID: <374485.1589637193@turing-police>
Date:   Sat, 16 May 2020 09:53:13 -0400
From:   "Valdis Klētnieks" <valdis.kletnieks@...edu>
To:     Subhashini Rao Beerisetty <subhashbeerisetty@...il.com>
Cc:     kernelnewbies <kernelnewbies@...nelnewbies.org>,
        linux-kernel@...r.kernel.org
Subject: Re: general protection fault vs Oops

On Sat, 16 May 2020 18:05:07 +0530, Subhashini Rao Beerisetty said:

> In the first attempt when I run that test case I landed into ���general
> protection fault: 0000 [#1] SMP" .. Next I rebooted and ran the same
> test , but now it resulted the ���Oops: 0002 [#1] SMP".

And the 0002 is telling you that there's been 2 previous bug/oops since the
reboot, so you need to go back through your dmesg and find the *first* one.

> In both cases the call trace looks exactly same and RIP points to
> ���native_queued_spin_lock_slowpath+0xfe/0x170"..

The first few entries in the call trace are the oops handler itself. So...

> May 16 12:06:17 test-pc kernel: [96934.567347] Call Trace:
> May 16 12:06:17 test-pc kernel: [96934.569475]  [<ffffffff8183c427>]__raw_spin_lock_irqsave+0x37/0x40
> May 16 12:06:17 test-pc kernel: [96934.571686]  [<ffffffffc0606812>] event_raise+0x22/0x60 [osa]
> May 16 12:06:17 test-pc kernel: [96934.573935]  [<ffffffffc06aa2a4>] multi_q_completed_one_buffer+0x34/0x40 [mcore]

The above line is the one where you hit the wall.

> May 16 12:59:22 test-pc kernel: [ 3011.405602] Call Trace:
> May 16 12:59:22 test-pc kernel: [ 3011.407892]  [<ffffffff8183c427>] _raw_spin_lock_irqsave+0x37/0x40
> May 16 12:59:22 test-pc kernel: [ 3011.410256]  [<ffffffffc0604812>] event_raise+0x22/0x60 [osa]
> May 16 12:59:22 test-pc kernel: [ 3011.412652]  [<ffffffffc06b72a4>] multi_q_completed_one_buffer+0x34/0x40 [mcore]

And again.

However,  given that it's a 4.4 kernel from 4 years ago, it's going to be
hard to find anybody who really cares.

In fact. I'm wondering if this is from some out-of-tree or vendor patch,
because I'm not finding any sign of that function in either the 5.7 or 4.4
tree.  Not even a sign of ## catenation abuse - no relevant hits for
"completed_one_buffer" or "multi_q" either

I don't think anybody's going to be able to help unless somebody first
identifies where that function is....

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