linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: assign CURSEG_ALL_DATA

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Date: Wed, 19 Jun 2024 09:09:18 +0800
From: Chao Yu <chao@...nel.org>
To: Jaegeuk Kim <jaegeuk@...nel.org>, linux-kernel@...r.kernel.org,
 linux-f2fs-devel@...ts.sourceforge.net
Cc: stable@...r.kernel.org
Subject: Re: [f2fs-dev] [PATCH] f2fs: assign CURSEG_ALL_DATA_ATGC if blkaddr
 is valid

On 2024/6/18 10:23, Jaegeuk Kim wrote:
> mkdir /mnt/test/comp
> f2fs_io setflags compression /mnt/test/comp
> dd if=/dev/zero of=/mnt/test/comp/testfile bs=16k count=1
> truncate --size 13 /mnt/test/comp/testfile
> 
> In the above scenario, we can get a BUG_ON.
>   kernel BUG at fs/f2fs/segment.c:3589!
>   Call Trace:
>    do_write_page+0x78/0x390 [f2fs]
>    f2fs_outplace_write_data+0x62/0xb0 [f2fs]
>    f2fs_do_write_data_page+0x275/0x740 [f2fs]
>    f2fs_write_single_data_page+0x1dc/0x8f0 [f2fs]
>    f2fs_write_multi_pages+0x1e5/0xae0 [f2fs]
>    f2fs_write_cache_pages+0xab1/0xc60 [f2fs]
>    f2fs_write_data_pages+0x2d8/0x330 [f2fs]
>    do_writepages+0xcf/0x270
>    __writeback_single_inode+0x44/0x350
>    writeback_sb_inodes+0x242/0x530
>    __writeback_inodes_wb+0x54/0xf0
>    wb_writeback+0x192/0x310
>    wb_workfn+0x30d/0x400
> 
> The reason is we gave CURSEG_ALL_DATA_ATGC to COMPR_ADDR where the
> page was set the gcing flag by set_cluster_dirty().
> 
> Cc: stable@...r.kernel.org
> Fixes: 4961acdd65c9 ("f2fs: fix to tag gcing flag on page during block migration")
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>

Reviewed-by: Chao Yu <chao@...nel.org>

Thanks,