linux-kernel - Re: [PATCH AUTOSEL 6.8 26/52] erofs: reliably distinguish block based and fscache mode

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Date: Wed, 8 May 2024 07:19:52 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
 stable@...r.kernel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Christian Brauner <brauner@...nel.org>, Baokun Li <libaokun1@...wei.com>,
 Jingbo Xu <jefflexu@...ux.alibaba.com>, Chao Yu <chao@...nel.org>,
 xiang@...nel.org, linux-erofs@...ts.ozlabs.org
Subject: Re: [PATCH AUTOSEL 6.8 26/52] erofs: reliably distinguish block based
 and fscache mode

Hi,

On 2024/5/8 07:06, Sasha Levin wrote:
> From: Christian Brauner <brauner@...nel.org>
> 
> [ Upstream commit 7af2ae1b1531feab5d38ec9c8f472dc6cceb4606 ]
> 
> When erofs_kill_sb() is called in block dev based mode, s_bdev may not
> have been initialised yet, and if CONFIG_EROFS_FS_ONDEMAND is enabled,
> it will be mistaken for fscache mode, and then attempt to free an anon_dev
> that has never been allocated, triggering the following warning:
> 
> ============================================
> ida_free called for id=0 which is not allocated.
> WARNING: CPU: 14 PID: 926 at lib/idr.c:525 ida_free+0x134/0x140
> Modules linked in:
> CPU: 14 PID: 926 Comm: mount Not tainted 6.9.0-rc3-dirty #630
> RIP: 0010:ida_free+0x134/0x140
> Call Trace:
>   <TASK>
>   erofs_kill_sb+0x81/0x90
>   deactivate_locked_super+0x35/0x80
>   get_tree_bdev+0x136/0x1e0
>   vfs_get_tree+0x2c/0xf0
>   do_new_mount+0x190/0x2f0
>   [...]
> ============================================
> 
> Now when erofs_kill_sb() is called, erofs_sb_info must have been
> initialised, so use sbi->fsid to distinguish between the two modes.
> 
> Signed-off-by: Christian Brauner <brauner@...nel.org>
> Signed-off-by: Baokun Li <libaokun1@...wei.com>
> Reviewed-by: Jingbo Xu <jefflexu@...ux.alibaba.com>
> Reviewed-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
> Reviewed-by: Chao Yu <chao@...nel.org>
> Link: https://lore.kernel.org/r/20240419123611.947084-3-libaokun1@huawei.com
> Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>


Please help drop this patch for now too, you should backport
the dependency commit
07abe43a28b2 ("erofs: get rid of erofs_fs_context") in advance.

Otherwise it doesn't work and break the functionality.

Thanks,
Gao Xiang