From: Oleg Nesterov <oleg@redhat.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: "Li,Rongqing" <lirongqing@baidu.com>,
Peter Zijlstra <peterz@infradead.org>,
David Laight <david.laight.linux@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"vschneid@redhat.com" <vschneid@redhat.com>,
"mgorman@suse.de" <mgorman@suse.de>,
"bsegall@google.com" <bsegall@google.com>,
"dietmar.eggemann@arm.com" <dietmar.eggemann@arm.com>,
"vincent.guittot@linaro.org" <vincent.guittot@linaro.org>,
"juri.lelli@redhat.com" <juri.lelli@redhat.com>,
"mingo@redhat.com" <mingo@redhat.com>
Subject: Re: divide error in x86 and cputime
Date: Tue, 8 Jul 2025 01:00:57 +0200 [thread overview]
Message-ID: <20250707230057.GC15787@redhat.com> (raw)
In-Reply-To: <20250707183331.029570bf@gandalf.local.home>
On 07/07, Steven Rostedt wrote:
>
> On Mon, 7 Jul 2025 18:20:56 -0400
> Steven Rostedt <rostedt@goodmis.org> wrote:
>
> > I would say this should never happen and if it does, let the kernel crash.
>
> >> [78250815.703852] CPU: 127 PID: 83435 Comm: killall Kdump: loaded Tainted: P OE K 5.10.0 #1
>
> This happened on a 5.10 kernel with a proprietary module loaded, so
> honestly, if it can't be reproduced on a newer kernel without any
> proprietary modules loaded, I say we don't worry about it.
Yes, agreed, see my reply to myself.
Oleg.
> I also don't by the utime + stime overflowing a 64bit number.
>
> 2^64 / 2 = 2^63 = 9223372036854775808
>
> That would be:
>
> minutes days
> v v
> 9223372036854775808 / 1000000000 / 60 / 60 / 24 / 365.25 = 292.27
> ^ ^ ^
> ns -> sec hours years
>
> So the report says they have threads running for a very long time, it would
> still be 292 years of run time!
>
> -- Steve
>
next prev parent reply other threads:[~2025-07-07 23:01 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-07 8:14 divide error in x86 and cputime Li,Rongqing
2025-07-07 15:11 ` Steven Rostedt
2025-07-07 22:09 ` Oleg Nesterov
2025-07-07 22:20 ` Steven Rostedt
2025-07-07 22:33 ` Steven Rostedt
2025-07-07 23:00 ` Oleg Nesterov [this message]
2025-07-08 11:00 ` David Laight
2025-07-08 1:40 ` 答复: [????] " Li,Rongqing
2025-07-08 1:53 ` Steven Rostedt
2025-07-08 1:58 ` 答复: [????] " Li,Rongqing
2025-07-08 2:05 ` Steven Rostedt
2025-07-08 2:17 ` Oleg Nesterov
2025-07-08 9:58 ` David Laight
2025-07-07 22:30 ` Oleg Nesterov
2025-07-07 23:41 ` 答复: [????] " Li,Rongqing
2025-07-07 23:53 ` Steven Rostedt
2025-07-08 0:10 ` 答复: [????] " Li,Rongqing
2025-07-08 0:30 ` Steven Rostedt
2025-07-08 1:17 ` 答复: [????] " Li,Rongqing
2025-07-08 1:41 ` Steven Rostedt
2025-07-08 10:35 ` [????] Re: [????] " David Laight
2025-07-08 11:12 ` 答复: [????] " Li,Rongqing
2025-07-08 0:23 ` 答复: " Li,Rongqing
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