From: Subhashini Rao Beerisetty <subhashbeerisetty@gmail.com>
To: Randy Dunlap <rdunlap@infradead.org>
Cc: "Valdis Klētnieks" <valdis.kletnieks@vt.edu>,
linux-kernel@vger.kernel.org,
kernelnewbies <kernelnewbies@kernelnewbies.org>
Subject: Re: general protection fault vs Oops
Date: Sat, 16 May 2020 21:45:15 +0530 [thread overview]
Message-ID: <CAPY=qRRJ6aZbbRnWfvjqojs08Z7H-+-6nzLAcpzjDcQOJ40fOQ@mail.gmail.com> (raw)
In-Reply-To: <af03bee5-27b2-4e92-359a-b1cc8f500d6d@infradead.org>
On Sat, May 16, 2020 at 9:29 PM Randy Dunlap <rdunlap@infradead.org> wrote:
>
> On 5/16/20 6:53 AM, Valdis Klētnieks wrote:
> > 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.
>
> Right.
>
> > 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
>
> Modules linked in:
> dbg(OE) mcore(OE) osa(OE)
>
> Out-of-tree, unsigned modules loaded.
Yes, those are out-of-tree modules. Basically, my question is, in
general what is the difference between 'general protection fault' and
'Oops' failure in kernel mode.
> We don't know what those are or how to debug them.
>
> > I don't think anybody's going to be able to help unless somebody first
> > identifies where that function is....
> >
>
>
> --
> ~Randy
>
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next prev parent reply other threads:[~2020-05-16 16:16 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-16 12:35 general protection fault vs Oops Subhashini Rao Beerisetty
2020-05-16 13:53 ` Valdis Klētnieks
2020-05-16 15:10 ` Subhashini Rao Beerisetty
2020-05-16 15:59 ` Randy Dunlap
2020-05-16 16:15 ` Subhashini Rao Beerisetty [this message]
2020-05-17 20:46 ` Cong Wang
2020-05-18 5:45 ` Subhashini Rao Beerisetty
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