On Thu, Jul 17, 2025 at 08:13:33AM +0800, Wang Yugui wrote: > Hi, > > There seems a deadloop(?) when mkfs.xfs -o rtdev. > > # mkfs.xfs -r rtdev=/dev/disk/by-id/ata-MZ7KM1T6HAJM00D3_S2CXNAAH600026 /dev/d > isk/by-id/scsi-SHITACHI_HUSMH842_CLAR100_0LX0JWVA -f > meta-data=/dev/disk/by-id/scsi-SHITACHI_HUSMH842_CLAR100_0LX0JWVA isize=512 agcount=20, agsize=1221072 blks > = sectsz=4096 attr=2, projid32bit=1 > = crc=1 finobt=1, sparse=1, rmapbt=0 > = reflink=0 bigtime=1 inobtcount=1 nrext64=1 > = exchange=0 > data = bsize=4096 blocks=24421440, imaxpct=25 > = sunit=0 swidth=0 blks > naming =version 2 bsize=4096 ascii-ci=0, ftype=1, parent=0 > log =internal log bsize=4096 blocks=41799, version=2 > = sectsz=4096 sunit=1 blks, lazy-count=1 > realtime =/dev/disk/by-id/ata-MZ7KM1T6HAJM00D3_S2CXNAAH600026 extsz=4096 blocks=390703446, rtextents=390703446 > Discarding blocks...Done. > Discarding blocks...Done. > > It did not fishish after 10 mins. > > # 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 () > > And, > 1) more chance happen when kernel 6.12.36, but yet not happen when kernel 6.6.93. > 2) it happen on both xfsprogs-6.11.0 and xfsprogs-6.4. You /could/ strace the mkfs process to see if it's really stuck, or just issuing IOs really slowly. --D > > Best Regards > Wang Yugui (wangyugui@xxxxxxxxxxxx) > 2025/07/17 > > >
