linux-kernel - Re: [btrfs] 62bd8124e2: WARNING:at_fs/btrfs/block-rsv.c:#btrfs_release_global_block

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Date:   Sun, 12 Jun 2022 22:36:46 +0800
From:   Oliver Sang <oliver.sang@...el.com>
To:     Filipe Manana <fdmanana@...nel.org>
Cc:     0day robot <lkp@...el.com>, LKML <linux-kernel@...r.kernel.org>,
        linux-btrfs@...r.kernel.org, lkp@...ts.01.org
Subject: Re: [btrfs]  62bd8124e2:
 WARNING:at_fs/btrfs/block-rsv.c:#btrfs_release_global_block_rsv[btrfs]

hi, Filipe Manana,

On Fri, Jun 10, 2022 at 09:26:59AM +0800, Oliver Sang wrote:
> hi, Filipe Manana,
> 
> On Thu, Jun 09, 2022 at 10:46:52AM +0100, Filipe Manana wrote:
> > 
> > I am unable to reproduce that on a 12 cores box.
> > I also don't see anything wrong that could lead to that by manual inspection.
> > 
> > How easy is it for you to trigger it?
> 
> we reproduced this upon 62bd8124e2 4 times out of 6 runs.
> but since the other 2 runs crash early due to other issues (below (1)), we
> cannot say they are clean.
> at the same time, the 6 runs for parent are clean.
> 
> 7e2bb5b3f3bca223 62bd8124e2f17910fcd89568e50
> ---------------- ---------------------------
>        fail:runs  %reproduction    fail:runs
>            |             |             |
>            :6           67%           4:6     dmesg.RIP:btrfs_release_global_block_rsv[btrfs]
>            :6           67%           4:6     dmesg.WARNING:at_fs/btrfs/block-rsv.c:#btrfs_release_global_block_rsv[btrfs]
>            :6           33%           2:6     dmesg.kernel_BUG_at_fs/xfs/xfs_message.c  <----- (1)
> 
> 
> > 
> > Can you also run it with CONFIG_BTRFS_ASSERT=y set in the kernel config?
> 
> got it, we will enable this config and rerun tests, for both this commit and
> parent.

we enabled CONFIG_BTRFS_ASSERT=y as attached config and rerun tests, still can
reproduce the issue, like:


7e2bb5b3f3bca223 62bd8124e2f17910fcd89568e50
---------------- ---------------------------
       fail:runs  %reproduction    fail:runs
           |             |             |
           :16          94%          15:16    dmesg.RIP:btrfs_release_global_block_rsv[btrfs]
           :16          94%          15:16    dmesg.WARNING:at_fs/btrfs/block-rsv.c:#btrfs_release_global_block_rsv[btrfs]
           :16           6%           1:16    dmesg.kernel_BUG_at_fs/xfs/xfs_message.c


attached one dmesg FYI

> 

View attachment "config-5.18.0-rc7-00185-g62bd8124e2f1" of type "text/plain" (164255 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (37724 bytes)