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

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Message-ID: <20220610012659.GA6844@xsang-OptiPlex-9020>
Date:   Fri, 10 Jun 2022 09:26:59 +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 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.