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If you > increase the size of the journal, does it go away? Can you get a > dump of the transaction reservation sizes for the filesystem in > question (the xfs_db logres command can do this, IIRC) and then run > the math on the reservations held from the dump of all the blocked > tasks holding locks to see if this matches the size of the journal > in the fs? Dave, thanks for the comments. I recreated the hang, and gathered relevant numbers [3]. Here, /dev/sdh is the SCRATCH_DEV. My interpretations are as follows (If I misunderstand anything correction will be appreciated): - The log section size is 4096 * 16384 = 64MiB. - The type 26 logres has 327552 size and logcount 5, then each blocking task consumes about 1.6MiB - My test node has 24 nproc, and the test case creases 2 * nproc * LOAD_FACTOR threads. LOAD_FACTOR is 1, then it creates 48 fio threads. Assuming all fio threads are blocked, and each thread consumes 16MiB in the log section, 1.6MiB * 48 = 76.8Mib will be consumed. This is beyond the log section size 64MiB. The sysfs attributes reserve_grant_head_bytes has the number close to 64MiB, and I guess it implies the log section is almost full. Based on these, Dave's guess look correct. As suggested, now I'm trying to increase the journal/log section size. I added the mkfs options below: MKFS_OPTIONS="-l size=128m" With this, I repeated the test case 30 times, and did not observe the hang. It looks like the log section size increase avoids the hang. I will keep it on running to see if the hang is observed after 100 times run. [3] $ sudo xfs_info /dev/sdh meta-data=/dev/sdh isize=512 agcount=4, agsize=524288 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=1, sparse=1, rmapbt=1 = reflink=1 bigtime=1 inobtcount=1 nrext64=1 = exchange=1 metadir=0 data = bsize=4096 blocks=2097152, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0, ftype=1, parent=1 log =internal log bsize=4096 blocks=16384, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 = rgcount=0 rgsize=0 extents = zoned=0 start=0 reserved=0 $ sudo xfs_db -c logres -r /dev/sdh type 0 logres 193528 logcount 5 flags 0x4 type 1 logres 327552 logcount 5 flags 0x4 type 2 logres 428160 logcount 5 flags 0x4 type 3 logres 247204 logcount 5 flags 0x4 type 4 logres 230820 logcount 5 flags 0x4 type 5 logres 312612 logcount 6 flags 0x4 type 6 logres 311460 logcount 5 flags 0x4 type 7 logres 285696 logcount 2 flags 0x4 type 8 logres 311460 logcount 6 flags 0x4 type 9 logres 303992 logcount 2 flags 0x4 type 10 logres 2168 logcount 0 flags 0x0 type 11 logres 82176 logcount 2 flags 0x4 type 12 logres 116856 logcount 2 flags 0x4 type 13 logres 760 logcount 0 flags 0x0 type 14 logres 326784 logcount 1 flags 0x4 type 15 logres 23288 logcount 3 flags 0x4 type 16 logres 21760 logcount 0 flags 0x0 type 17 logres 164480 logcount 3 flags 0x4 type 18 logres 640 logcount 0 flags 0x0 type 19 logres 111864 logcount 2 flags 0x4 type 20 logres 4224 logcount 0 flags 0x0 type 21 logres 6512 logcount 0 flags 0x0 type 22 logres 232 logcount 1 flags 0x0 type 23 logres 197751 logcount 5 flags 0x4 type 24 logres 640 logcount 1 flags 0x0 type 25 logres 760 logcount 0 flags 0x0 type 26 logres 327552 logcount 5 flags 0x4 minlogsize logres 428160 logcount 5 $ grep . /sys/fs/xfs/sdh/log/* /sys/fs/xfs/sdh/log/log_head_lsn:1:103190 /sys/fs/xfs/sdh/log/log_tail_lsn:1:101012 /sys/fs/xfs/sdh/log/reserve_grant_head_bytes:66053588 /sys/fs/xfs/sdh/log/write_grant_head_bytes:65718696