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Date: Tue, 27 Jan 2026 06:25:44 +0100
From: Christoph Hellwig <hch@lst.de>
To: Qu Wenruo <wqu@suse.com>
Cc: Christoph Hellwig <hch@lst.de>, David Sterba <dsterba@suse.com>,
	linux-btrfs@vger.kernel.org
Subject: Re: btrfs/124 assert failure / crash
Message-ID: <20260127052544.GC24364@lst.de>
References: <20260126045555.GB31641@lst.de> <8b0c1232-4e85-4942-8417-78e12982a090@suse.com>
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On Tue, Jan 27, 2026 at 03:49:13PM +1030, Qu Wenruo wrote:
>
>
> 在 2026/1/26 15:25, Christoph Hellwig 写道:
>> When running xfstets on btrfs with SCRATCH_DEV_POOL enabled, I the
>> warning below pretty much every time, and then the assert fail crashing
>> the kernel after it (also in the log below) about every second run.
>
> Mind to share the SCRATCH_DEV_POOL details? Especially the size of each 
> device.

export SCRATCH_DEV_POOL="/dev/vdc /dev/nvme0n1 /dev/nvme1n1 /dev/nvme2n1 /dev/nvme3n1 /dev/nvme4n1 /dev/nvme5n1 /dev/nvme6n1"

NAME    ALIGNMENT MIN-IO OPT-IO PHY-SEC LOG-SEC ROTA SCHED       RQ-SIZE   RA WSAME

...

vdb             0   4096      0    4096    4096    1 none            256 8192    0B
vdc             0   4096      0    4096    4096    1 none            256 8192    0B
nvme0n1         0   4096      0    4096    4096    0 none           1023  128    0B
nvme4n1         0   4096      0    4096    4096    0 none           1023  128    0B
nvme3n1         0   4096      0    4096    4096    0 none           1023  128    0B
nvme6n1         0   4096      0    4096    4096    0 none           1023  128    0B
nvme2n1         0   4096      0    4096    4096    0 none           1023  128    0B
nvme5n1         0   4096      0    4096    4096    0 none           1023  128    0B
nvme1n1         0   4096      0    4096    4096    0 none           1023  128    0B

this does not seem to happen when all devices are the same size,
something I just ried after pasting this.