tests/features/mandatory-lock-forced.t failures

[pranithk]

root@glusterfs-fedora-41:/home/pk/glusterfs# prove -rfv tests/features/mandatory-lock-forced.t
tests/features/mandatory-lock-forced.t .. egrep: warning: egrep is obsolescent; using grep -E
egrep: warning: egrep is obsolescent; using grep -E

1..30
ok   1 [    128/   1017] <   8> 'glusterd'
ok   2 [     24/     94] <  11> 'gluster --mode=script --wignore volume create patchy glusterfs-fedora-41:/d/backends/patchy1 glusterfs-fedora-41:/d/backends/patchy2'
ok   3 [     28/     48] <  12> 'patchy volinfo_field patchy Volume Name'
ok   4 [     17/     46] <  13> 'Created volinfo_field patchy Status'
ok   5 [     18/    125] <  16> 'gluster --mode=script --wignore volume set patchy performance.open-behind off'
ok   6 [     35/    145] <  17> 'gluster --mode=script --wignore volume set patchy performance.write-behind off'
ok   7 [     20/     80] <  18> 'gluster --mode=script --wignore volume set patchy performance.quick-read off'
ok   8 [     19/     97] <  19> 'gluster --mode=script --wignore volume set patchy performance.io-cache off'
ok   9 [     53/     86] <  20> 'gluster --mode=script --wignore volume set patchy performance.read-ahead off'
ok  10 [     23/    202] <  23> 'gluster --mode=script --wignore volume start patchy'
ok  11 [     48/     46] <  24> '_GFS --attribute-timeout=0 --entry-timeout=0 --volfile-id=/patchy --volfile-server=glusterfs-fedora-41 /mnt/glusterfs/0'
ok  12 [     68/      1] <  30> '[ 0 -eq 0 ]'
ok  13 [     27/      0] <  33> '[ 0 -eq 0 ]'
ok  14 [     29/      2] <  36> '[ 0 -eq 0 ]'
ok  15 [     33/      3] <  39> '[ 0 -eq 0 ]'
ok  16 [   2042/      2] <  43> '[ 0 -eq 0 ]'
ok  17 [     33/      0] <  46> '[ 0 -eq 0 ]'
ok  18 [   2038/      1] <  49> '[ 0 -eq 0 ]'
ok  19 [     33/    113] <  52> 'gluster --mode=script --wignore volume set patchy mandatory-locking forced'
ok  20 [     20/      5] <  55> 'umount /mnt/glusterfs/0'
ok  21 [     39/   2091] <  56> 'gluster --mode=script --wignore volume stop patchy'
ok  22 [     21/    147] <  57> 'gluster --mode=script --wignore volume start patchy'
ok  23 [     29/     19] <  58> '_GFS --attribute-timeout=0 --entry-timeout=0 --volfile-id=/patchy --volfile-server=glusterfs-fedora-41 /mnt/glusterfs/0'
ok  24 [     24/      1] <  62> '[ 0 -eq 0 ]'
Child write : returned error (Resource temporarily unavailable)
ok  25 [     18/     20] <  64> 'Resource temporarily unavailable tests/features/mandatory-lock RD_LCK NONE WRITE'
not ok  26 [     23/     14] <  66> 'Resource temporarily unavailable tests/features/mandatory-lock WR_LCK NONE READ' -> 'Got "" instead of "Resource temporarily unavailable"'
Child write : returned error (Resource temporarily unavailable)
ok  27 [     22/     11] <  68> 'Resource temporarily unavailable tests/features/mandatory-lock WR_LCK NONE WRITE'
Child open : returned error (Resource temporarily unavailable)
ok  28 [     21/   2010] <  70> 'Resource temporarily unavailable tests/features/mandatory-lock RD_LCK TRUNC READ'
Child ftruncate : returned error (Resource temporarily unavailable)
ok  29 [     33/     18] <  72> 'Resource temporarily unavailable tests/features/mandatory-lock RD_LCK NONE FTRUNCATE'
ok  30 [     32/   2014] <  74> 'Resource temporarily unavailable tests/features/mandatory-lock RD_LCK BLOCK WRITE'
Failed 1/30 subtests

Test Summary Report
-------------------
tests/features/mandatory-lock-forced.t (Wstat: 0 Tests: 30 Failed: 1)
  Failed test:  26
Files=1, Tests=30, 14 wallclock secs ( 0.02 usr  0.00 sys +  0.81 cusr  0.72 csys =  1.55 CPU)
Result: FAIL

[pranithk]

On debugging, I am seeing that the read-call issued by the program is not coming to the mount at all. Even if I disable md-cache it doesn't happen.
If I make the following change, the test passes(File size tests, fail though), but I am not sure why fuse is not sending reads for files with 0 size, maybe some kind of optimisation.

pk@glusterfs-fedora-41:~/glusterfs$ git diff
diff --git a/tests/features/mandatory-lock-forced.c b/tests/features/mandatory-lock-forced.c
index 4028d6c6ea..60bd8ba2bc 100644
--- a/tests/features/mandatory-lock-forced.c
+++ b/tests/features/mandatory-lock-forced.c
@@ -76,6 +76,7 @@ main(int argc, char *argv[])
     fd = open(fname, O_CREAT | O_RDWR, 0755);
     if (fd == -1)
         LOG_ERR("Parent create", errno);
+    err = write(fd, buf, 10);

     /* Determine the type of lock */
     if (strcmp(argv[1], "RD_LCK") == 0)