linux-kernel - Re: 5.4.143-rt63 fscache sleeps while holding a look

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Message-ID: <20211028085728.j34fsqbvtb5hqqfc@linutronix.de>
Date:   Thu, 28 Oct 2021 10:57:28 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Gregor Beck <gregor.beck@...il.com>
Cc:     linux-kernel@...r.kernel.org, Tom Zanussi <zanussi@...nel.org>
Subject: Re: 5.4.143-rt63 fscache sleeps while holding a look

On 2021-09-14 10:29:40 [+0200], Gregor Beck wrote:
Hi,

> with kernel 5.4.143-rt63 fscache might sleep while holding a lock:
> 
> [ 1392.058346] BUG: sleeping function called from invalid context at
> kernel/locking/rtmutex.c:973
> [ 1392.058349] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 159,
> name: kswapd0
> [ 1392.058351] Preemption disabled at:
> [ 1392.058351] [<ffffffffc053a2a5>] fscache_enqueue_object+0x45/0x100
> [fscache]

This brings some memory back. Let me stare at it.

> Gregor

Sebastian