On Thu, Aug 25, 2022 at 12:49:06AM +0800, Coly Li wrote: > 5, reload dm table for dm-0 > # cat dm-table-reload | dmsetup reload /dev/dm-0 > And the content of dm-table-reload is, > 0 1 linear /dev/dm-0 0 > 1 181065566 linear /dev/dm-0 1 > 1) Does anyone observe or encounter such panic or deadlock before? > 2) To permit recursive dm-table reload, is it a bug or just as-designed ? It's one of those 'That is a stupid thing to do!' situations. Don't do it! We have some detection for recursion in our userspace code but we can't catch everything. But arguably that specific case of a self-reference is an easy one to detect kernel-side - table_load could ensure dm_table_get_devices() does not include the device itself - so it might be worth patching. Alasdair -- dm-devel mailing list dm-devel@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/dm-devel
