On Thu, Jul 17, 2025 at 08:13:33AM +0800, Wang Yugui wrote: > > # pstack 5785 > #0 0x00007f8df5efc01a in pread64 () from /lib64/libc.so.6 > #1 0x0000557b7bbfe9c3 in __read_buf.constprop.0 () > #2 0x0000557b7bbc3030 in libxfs_buf_read_map () > #3 0x0000557b7bbfe1ae in libxfs_trans_read_buf_map.constprop () > #4 0x0000557b7bbee7ef in xfs_rtbuf_get () > #5 0x0000557b7bbf03d8 in libxfs_rtfree_extent () > #6 0x0000557b7bbbb322 in parseproto.lto_priv () > #7 0x0000557b7bbb7643 in main () This is reading the data from the main device for updating the bits on the rt bitmap. If you have a very larger rt device this can take a long time and might not be stuck. And easy way to test that hypothesis would be to try formatting with a very large RT exent size.
