Hello,

kern  :err   : [  187.461914] F2FS-fs (sda1): Swapfile does not align to section

commit 02eb84b96bc1b382dd138bf60724edbefe77b025
Author: huangjianan@oppo.com [off-list ref]
Date:   Mon Mar 1 12:58:44 2021 +0800

    f2fs: check if swapfile is section-alligned

    If the swapfile isn't created by pin and fallocate, it can't be
    guaranteed section-aligned, so it may be selected by f2fs gc. When
    gc_pin_file_threshold is reached, the address of swapfile may change,
    but won't be synchronized to swap_extent, so swap will write to wrong
    address, which will cause data corruption.

    Signed-off-by: Huang Jianan [off-list ref]
    Signed-off-by: Guo Weichao [off-list ref]
    Reviewed-by: Chao Yu [off-list ref]
    Signed-off-by: Jaegeuk Kim [off-list ref]

The test uses fallocate to preallocate the swap file and writes zeros to
it. I'm not sure what pin refers to?

-- 
Thank you,
Richard.