linux-kernel - Re: [test_rht_init] INFO: task swapper/0:1 blocked for more than 120 seconds.

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Date:   Mon, 27 Nov 2017 13:34:55 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Fengguang Wu <fengguang.wu@...el.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        Phil Sutter <phil@....cc>, Thomas Graf <tgraf@...g.ch>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Westphal <fw@...len.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        LKP <lkp@...org>
Subject: Re: [test_rht_init] INFO: task swapper/0:1 blocked for more than 120 seconds.

On Tue, Nov 21, 2017 at 3:52 AM, Fengguang Wu <fengguang.wu@...el.com> wrote:
> Here is a different call trace related to rhashtable.
>
> It occurs in 17 out of 90 boots.
>
> [  342.666234] Writes:  Total: 4  Max/Min: 0/0   Fail: 0
> [  381.918047] INFO: task swapper/0:1 blocked for more than 120 seconds.

This looks very similar to the other lockup case: lock torture testing
and rhashtable testing at the same time, causing long long delays..

          Linus