linux-ext4 - Re: linux-next test error: BUG: using smp_processor_id() in preemptible [ADDR] code: systemd-rfkill/6728

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Date:   Thu, 4 Jun 2020 21:12:18 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>
Cc:     adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-next@...r.kernel.org,
        sfr@...b.auug.org.au, syzkaller-bugs@...glegroups.com,
        tytso@....edu,
        syzbot <syzbot+aed048f49c59eb997737@...kaller.appspotmail.com>
Subject: Re: linux-next test error: BUG: using smp_processor_id() in
 preemptible [ADDR] code: systemd-rfkill/6728

On Thu, Jun 04, 2020 at 09:02:20PM -0700, Eric Biggers wrote:
> Introduced by:
> 
> commit 42f56b7a4a7db127a9d281da584152dc3d525d25
> Author: Ritesh Harjani <riteshh@...ux.ibm.com>
> Date:   Wed May 20 12:10:34 2020 +0530
> 
>     ext4: mballoc: introduce pcpu seqcnt for freeing PA to improve ENOSPC handling
> 

Hmm, syzbot reported this several times already.  Marking it as a duplicate
of the report where the discussion happened:

#syz dup: linux-next test error: BUG: using smp_processor_id() in preemptible [ADDR] code: syz-fuzzer/6792

- Eric