• Josef Bacik's avatar
    ext4: wait for log to commit when umounting · 1cd3f198
    Josef Bacik authored
    (cherry picked from commit d4edac31)
    
    There is a potential race when a transaction is committing right when
    the file system is being umounting.  This could reduce in a race
    because EXT4_SB(sb)->s_group_info could be freed in ext4_put_super
    before the commit code calls a callback so the mballoc code can
    release freed blocks in the transaction, resulting in a panic trying
    to access the freed s_group_info.
    
    The fix is to wait for the transaction to finish committing before we
    shutdown the multiblock allocator.
    Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
    Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
    1cd3f198
super.c 113 KB