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Date:   Wed, 28 Nov 2018 14:41:39 +0000
From:   Al Viro <viro@zeniv.linux.org.uk>
To:     Willy Wolff <willy.mh.wolff.ml@gmail.com>
Cc:     linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: oops when ext4 fs is full
Message-ID: <20181128144139.GG2217@ZenIV.linux.org.uk>
References: <20181128085038.iaklny2yuygrixhs@inc028000049.lancs.ac.uk>
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On Wed, Nov 28, 2018 at 08:50:39AM +0000, Willy Wolff wrote:
> Hi,
> I got a Oops when the hard drive was COMPLETELY full using a ext4 fs.
> After it, any command on the directory where the last write should have occurred freezes, while any other directory behave just fine.
> 
> If this email is not relevant for you, please point me what to do.
> 
> Best Regards,
> Willy
> 
> 
> $ cat /proc/version 
> Linux version 4.18.7-dirty (willy@inc028000049) (gcc version 6.3.0 20170516 (Debian 6.3.0-18)) #32 SMP PREEMPT Thu Sep 27 19:31:11 BST 2018
> 
> The kernel is dirty but the modifications are not related to the fs subsystem. The system is running on a Hardkernel Odroid-xu3 but running with the mainline linux at 8ea7eadbef2f7103d5871016f03fc38b3adeaddb
> Also, the fs is on a SD-card. I did a fs check after the oops, no errors are reported.

Disassembly of __d_instantiate in your build would obviously be useful...
_Presumably_ it's one of the spin_lock() inlined there, but it would be
useful to know which one...