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Wong wrote: > From: Darrick J. Wong > > This test fails mostly-predictably across my testing fleet with: > > --- /run/fstests/bin/tests/generic/774.out 2025-10-20 10:03:43.432910446 -0700 > +++ /var/tmp/fstests/generic/774.out.bad 2025-11-10 01:14:58.941775866 -0800 > @@ -1,2 +1,11 @@ > QA output created by 774 > +fio: failed initializing LFSR > +verify: bad magic header 0, wanted acca at file /opt/test-file offset 0, length 33554432 (requested block: offset=0, length=33554432) > +verify: bad magic header 0, wanted acca at file /opt/test-file offset 33554432, length 33554432 (requested block: offset=33554432, length=33554432) > +verify: bad magic header 0, wanted acca at file /opt/test-file offset 67108864, length 33554432 (requested block: offset=67108864, length=33554432) > +verify: bad magic header 0, wanted acca at file /opt/test-file offset 100663296, length 33554432 (requested block: offset=100663296, length=33554432) > +verify: bad magic header 0, wanted acca at file /opt/test-file offset 134217728, length 33554432 (requested block: offset=134217728, length=33554432) > +verify: bad magic header 0, wanted acca at file /opt/test-file offset 167772160, length 33554432 (requested block: offset=167772160, length=33554432) > +verify: bad magic header 0, wanted acca at file /opt/test-file offset 201326592, length 33554432 (requested block: offset=201326592, length=33554432) > +verify: bad magic header 0, wanted acca at file /opt/test-file offset 234881024, length 33554432 (requested block: offset=234881024, length=33554432) > Silence is golden > > I'm not sure why the linear feedback shift register algorithm is > specifically needed for this test. > > Cc: # v2025.10.20 > Fixes: 9117fb93b41c38 ("generic: Add atomic write test using fio verify on file mixed mappings") > Signed-off-by: "Darrick J. Wong" Reviewed-by: John Garry BTW, if you would like to make further tidy ups, then I don't think that verify_write_sequence=0 is required (for verify config). That is only relevant when we have multiple threads writing to the same region, which I don't think is the case here. cheers > --- > tests/generic/774 | 4 ---- > 1 file changed, 4 deletions(-) > > > diff --git a/tests/generic/774 b/tests/generic/774 > index 28886ed5b09ff7..86ab01fbd35874 100755 > --- a/tests/generic/774 > +++ b/tests/generic/774 > @@ -56,14 +56,12 @@ group_reporting=1 > ioengine=libaio > rw=randwrite > io_size=$((filesize/3)) > -random_generator=lfsr > > # Create unwritten extents > [prep_unwritten_blocks] > ioengine=falloc > rw=randwrite > io_size=$((filesize/3)) > -random_generator=lfsr > EOF > > cat >$fio_aw_config < @@ -73,7 +71,6 @@ ioengine=libaio > rw=randwrite > direct=1 > atomic=1 > -random_generator=lfsr > group_reporting=1 > > filename=$testfile > @@ -93,7 +90,6 @@ cat >$fio_verify_config < [verify_job] > ioengine=libaio > rw=read > -random_generator=lfsr > group_reporting=1 > > filename=$testfile >