Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1688712

RE: [PATCH V2] kernel/watchdog: fix spurious hard lockups

From Thomas Gleixner <tglx@linutronix.de>
Newsgroups linux.kernel
Subject RE: [PATCH V2] kernel/watchdog: fix spurious hard lockups
Date 2017-07-17 09:20 +0200
Message-ID <u48tY-1Uf-5@gated-at.bofh.it> (permalink)
References (4 earlier) <tVzD4-4tc-7@gated-at.bofh.it> <tVEMp-7yC-3@gated-at.bofh.it> <tWINX-6Zu-3@gated-at.bofh.it> <tX57P-5yg-13@gated-at.bofh.it> <u431g-6LV-13@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

On Mon, 17 Jul 2017, Liang, Kan wrote:
> There are three proposed patches so far.
> Patch 1: The patch as above which speed up the hrtimer.
> Patch 2: Thomas's first proposal.
> https://patchwork.kernel.org/patch/9803033/
> https://patchwork.kernel.org/patch/9805903/
> Patch 3: my original proposal which increase the NMI watchdog timeout by 3X
> https://patchwork.kernel.org/patch/9802053/
> 
> According to our test, only patch 3 works well.
> The other two patches will hang the system eventually.
> For patch 1, the system hang after running our test case for ~1 hour.
> For patch 2, the system hang in running the overnight test.
> There is no error message shown when the system hang. So I don't know the
> root cause yet.

That doesn't make sense. What's the exact test procedure?

> BTW: We set 1 to watchdog_thresh when we did the test.
> It's believed that can speed up the failure.

Believe is not really a technical measure....

Thanks,

	tglx

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

RE: [PATCH V2] kernel/watchdog: fix spurious hard lockups "Liang, Kan" <kan.liang@intel.com> - 2017-07-17 03:30 +0200
  RE: [PATCH V2] kernel/watchdog: fix spurious hard lockups Thomas Gleixner <tglx@linutronix.de> - 2017-07-17 09:20 +0200
    RE: [PATCH V2] kernel/watchdog: fix spurious hard lockups "Liang, Kan" <kan.liang@intel.com> - 2017-07-17 14:20 +0200
      RE: [PATCH V2] kernel/watchdog: fix spurious hard lockups Thomas Gleixner <tglx@linutronix.de> - 2017-07-17 15:20 +0200
        RE: [PATCH V2] kernel/watchdog: fix spurious hard lockups "Liang, Kan" <kan.liang@intel.com> - 2017-07-17 16:50 +0200
          RE: [PATCH V2] kernel/watchdog: fix spurious hard lockups Thomas Gleixner <tglx@linutronix.de> - 2017-07-17 17:10 +0200
  Re: [PATCH V2] kernel/watchdog: fix spurious hard lockups Don Zickus <dzickus@redhat.com> - 2017-07-17 16:50 +0200

csiph-web