On Thu, Aug 31, 2023 at 07:31:57AM +0200, Christoph Hellwig wrote: > sb->s_fs_info can only be safely freed after generic_shutdown_super was > called and all access to the super_block has stopped. > > Thus only free the private data after calling kill_litter_super, which > calls generic_shutdown_super internally. Same as for ramfs. We *do* use ->s_fs_info there, but only for operations that require an active reference. They can't overlap with ->kill_sb().