[bug #44448] grub refuses to load (or recognize) a freebsd module -- "file not found"

[Kostya Berger]

Follow-up Comment #11, bug #44448 (project grub):

Here is my log with grub-fstest -d zfs (for the problematic file):
grub-core/fs/zfs/zfs.c:1190: label ok 0
grub-core/fs/zfs/zfs.c:1005: check 2 passed
grub-core/fs/zfs/zfs.c:1016: check 3 passed
grub-core/fs/zfs/zfs.c:1023: check 4 passed
grub-core/fs/zfs/zfs.c:1033: check 6 passed
grub-core/fs/zfs/zfs.c:1041: check 7 passed
grub-core/fs/zfs/zfs.c:1052: check 8 passed
grub-core/fs/zfs/zfs.c:1062: check 9 passed
grub-core/fs/zfs/zfs.c:1084: check 11 passed
grub-core/fs/zfs/zfs.c:1110: check 10 passed
grub-core/fs/zfs/zfs.c:1126: str=com.delphix:hole_birth
grub-core/fs/zfs/zfs.c:1126: str=com.delphix:embedded_data
grub-core/fs/zfs/zfs.c:1135: check 12 passed (feature flags)
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 2048/2048
grub-core/fs/zfs/zfs.c:1897: endian = -1
grub-core/fs/zfs/zfs.c:593: dva=4, 783216e
grub-core/fs/zfs/zfs.c:2679: endian = -1, blkid=0
grub-core/fs/zfs/zfs.c:2021: endian = -1
grub-core/fs/zfs/zfs.c:2052: endian = -1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/16384
grub-core/fs/zfs/zfs.c:1897: endian = -1
grub-core/fs/zfs/zfs.c:593: dva=20, 780fb4e
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/16384
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=20, 780faee
grub-core/fs/zfs/zfs.c:2683: alive
grub-core/fs/zfs/zfs.c:2494: looking for 'features_for_read'
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 1024/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 52635c1
grub-core/fs/zfs/zfs.c:2504: zap read
grub-core/fs/zfs/zfs.c:2508: micro zap
grub-core/fs/zfs/zfs.c:2511: returned 0
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 512/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 17
grub-core/fs/zfs/zfs.c:2110: zap: name = org.illumos:lz4_compress, value = 1,
cd = 0
grub-core/fs/zfs/zfs.c:2110: zap: name = com.joyent:multi_vdev_crash_dump,
value = 0, cd = 0
grub-core/fs/zfs/zfs.c:2110: zap: name = com.delphix:hole_birth, value = 1, cd
= 0
grub-core/fs/zfs/zfs.c:2110: zap: name = com.delphix:extensible_dataset, value
= 0, cd = 0
grub-core/fs/zfs/zfs.c:2110: zap: name = com.delphix:embedded_data, value = 1,
cd = 0
grub-core/fs/zfs/zfs.c:2110: zap: name = , value = 0, cd = 0
grub-core/fs/zfs/zfs.c:2110: zap: name = , value = 0, cd = 0
grub-core/fs/zfs/zfs.c:3256: alive
grub-core/fs/zfs/zfs.c:3068: endian = 1
grub-core/fs/zfs/zfs.c:2679: endian = 1, blkid=0
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/16384
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=20, 780fb4e
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/16384
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=20, 780faee
grub-core/fs/zfs/zfs.c:2683: alive
grub-core/fs/zfs/zfs.c:3075: alive
grub-core/fs/zfs/zfs.c:2494: looking for 'root_dataset'
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 1024/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 52635c1
grub-core/fs/zfs/zfs.c:2504: zap read
grub-core/fs/zfs/zfs.c:2508: micro zap
grub-core/fs/zfs/zfs.c:2511: returned 0
grub-core/fs/zfs/zfs.c:3081: alive
grub-core/fs/zfs/zfs.c:3087: alive
grub-core/fs/zfs/zfs.c:3265: alive
grub-core/fs/zfs/zfs.c:3269: endian = 0
grub-core/fs/zfs/zfs.c:3279: endian = 1
grub-core/fs/zfs/zfs.c:3133: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 2048/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 4c00011
grub-core/fs/zfs/zfs.c:3359: endian = 1
grub-core/fs/zfs/zfs.c:3133: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 2048/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 4c00011
grub-core/fs/zfs/zfs.c:2679: endian = 1, blkid=0
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 526351a
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 5263519
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 5263518
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 5263517
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 5263516
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 5263515
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/1024
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=2, 5263513
grub-core/fs/zfs/zfs.c:2683: alive
grub-core/fs/zfs/zfs.c:2494: looking for 'ROOT'
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 1024/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 0
grub-core/fs/zfs/zfs.c:2504: zap read
grub-core/fs/zfs/zfs.c:2508: micro zap
grub-core/fs/zfs/zfs.c:2511: returned 0
grub-core/fs/zfs/zfs.c:1190: label ok 0
grub-core/fs/zfs/zfs.c:1005: check 2 passed
grub-core/fs/zfs/zfs.c:1016: check 3 passed
grub-core/fs/zfs/zfs.c:1023: check 4 passed
grub-core/fs/zfs/zfs.c:1033: check 6 passed
grub-core/fs/zfs/zfs.c:1041: check 7 passed
grub-core/fs/zfs/zfs.c:1052: check 8 passed
grub-core/fs/zfs/zfs.c:1062: check 9 passed
grub-core/fs/zfs/zfs.c:1084: check 11 passed
grub-core/fs/zfs/zfs.c:1110: check 10 passed
grub-core/fs/zfs/zfs.c:1126: str=com.delphix:hole_birth
grub-core/fs/zfs/zfs.c:1126: str=com.delphix:embedded_data
grub-core/fs/zfs/zfs.c:1135: check 12 passed (feature flags)
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 2048/2048
grub-core/fs/zfs/zfs.c:1897: endian = -1
grub-core/fs/zfs/zfs.c:593: dva=4, 783216e
grub-core/fs/zfs/zfs.c:2679: endian = -1, blkid=0
grub-core/fs/zfs/zfs.c:2021: endian = -1
grub-core/fs/zfs/zfs.c:2052: endian = -1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/16384
grub-core/fs/zfs/zfs.c:1897: endian = -1
grub-core/fs/zfs/zfs.c:593: dva=20, 780fb4e
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/16384
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=20, 780faee
grub-core/fs/zfs/zfs.c:2683: alive
grub-core/fs/zfs/zfs.c:2494: looking for 'features_for_read'
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 1024/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 52635c1
grub-core/fs/zfs/zfs.c:2504: zap read
grub-core/fs/zfs/zfs.c:2508: micro zap
grub-core/fs/zfs/zfs.c:2511: returned 0
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 512/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 17
grub-core/fs/zfs/zfs.c:2110: zap: name = org.illumos:lz4_compress, value = 1,
cd = 0
grub-core/fs/zfs/zfs.c:2110: zap: name = com.joyent:multi_vdev_crash_dump,
value = 0, cd = 0
grub-core/fs/zfs/zfs.c:2110: zap: name = com.delphix:hole_birth, value = 1, cd
= 0
grub-core/fs/zfs/zfs.c:2110: zap: name = com.delphix:extensible_dataset, value
= 0, cd = 0
grub-core/fs/zfs/zfs.c:2110: zap: name = com.delphix:embedded_data, value = 1,
cd = 0
grub-core/fs/zfs/zfs.c:2110: zap: name = , value = 0, cd = 0
grub-core/fs/zfs/zfs.c:2110: zap: name = , value = 0, cd = 0
grub-core/fs/zfs/zfs.c:3254: fsname = '/ROOT/default' snapname='(null)'
filename = '/boot/kernel/zfs.ko'
grub-core/fs/zfs/zfs.c:3256: alive
grub-core/fs/zfs/zfs.c:3068: endian = 1
grub-core/fs/zfs/zfs.c:2679: endian = 1, blkid=0
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/16384
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=20, 780fb4e
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/16384
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=20, 780faee
grub-core/fs/zfs/zfs.c:2683: alive
grub-core/fs/zfs/zfs.c:3075: alive
grub-core/fs/zfs/zfs.c:2494: looking for 'root_dataset'
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 1024/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 52635c1
grub-core/fs/zfs/zfs.c:2504: zap read
grub-core/fs/zfs/zfs.c:2508: micro zap
grub-core/fs/zfs/zfs.c:2511: returned 0
grub-core/fs/zfs/zfs.c:3081: alive
grub-core/fs/zfs/zfs.c:3087: alive
grub-core/fs/zfs/zfs.c:2494: looking for 'ROOT'
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 1: size 512/105
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:2504: zap read
grub-core/fs/zfs/zfs.c:2508: micro zap
grub-core/fs/zfs/zfs.c:2511: returned 0
grub-core/fs/zfs/zfs.c:2679: endian = 1, blkid=1
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/16384
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=20, 780fb4e
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/3584
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=7, 783686a
grub-core/fs/zfs/zfs.c:2683: alive
grub-core/fs/zfs/zfs.c:2494: looking for 'default'
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 1: size 512/61
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:2504: zap read
grub-core/fs/zfs/zfs.c:2508: micro zap
grub-core/fs/zfs/zfs.c:2511: returned 0
grub-core/fs/zfs/zfs.c:3265: alive
grub-core/fs/zfs/zfs.c:3269: endian = 0
grub-core/fs/zfs/zfs.c:3279: endian = 1
grub-core/fs/zfs/zfs.c:3133: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 2048/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 7836869
grub-core/fs/zfs/zfs.c:3359: endian = 1
grub-core/fs/zfs/zfs.c:2679: endian = 1, blkid=0
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 7836865
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 7836864
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 7836863
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 7836862
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/7680
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=f, 783682c
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/7168
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=e, 7835bd6
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/3584
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=7, 7835bcf
grub-core/fs/zfs/zfs.c:2683: alive
grub-core/fs/zfs/zfs.c:2494: looking for 'VERSION'
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 1024/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 231
grub-core/fs/zfs/zfs.c:2504: zap read
grub-core/fs/zfs/zfs.c:2508: micro zap
grub-core/fs/zfs/zfs.c:2511: returned 0
grub-core/fs/zfs/zfs.c:2494: looking for 'casesensitivity'
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 1024/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 231
grub-core/fs/zfs/zfs.c:2504: zap read
grub-core/fs/zfs/zfs.c:2508: micro zap
grub-core/fs/zfs/zfs.c:2511: returned 0
grub-core/fs/zfs/zfs.c:2494: looking for 'ROOT'
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 1024/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 231
grub-core/fs/zfs/zfs.c:2504: zap read
grub-core/fs/zfs/zfs.c:2508: micro zap
grub-core/fs/zfs/zfs.c:2511: returned 0
grub-core/fs/zfs/zfs.c:2494: looking for 'boot'
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 2560/1024
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=2, 780038a
grub-core/fs/zfs/zfs.c:2504: zap read
grub-core/fs/zfs/zfs.c:2508: micro zap
grub-core/fs/zfs/zfs.c:2511: returned 0
grub-core/fs/zfs/zfs.c:2494: looking for 'kernel'
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 3072/1024
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=2, 9e
grub-core/fs/zfs/zfs.c:2504: zap read
grub-core/fs/zfs/zfs.c:2508: micro zap
grub-core/fs/zfs/zfs.c:2511: returned 0
grub-core/fs/zfs/zfs.c:2679: endian = 1, blkid=4288
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 7836865
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 7836864
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 7836863
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/512
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=1, 7836862
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=8, 7831d78
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2052: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/4608
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=9, 7836859
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 16384/1024
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=2, 1219b90
grub-core/fs/zfs/zfs.c:2683: alive
grub-core/fs/zfs/zfs.c:2494: looking for 'zfs.ko'
grub-core/fs/zfs/zfs.c:2021: endian = 1
grub-core/fs/zfs/zfs.c:2047: endian = 1
grub-core/fs/zfs/zfs.c:1876: zio_read: E 0: size 98304/16896
grub-core/fs/zfs/zfs.c:1897: endian = 1
grub-core/fs/zfs/zfs.c:593: dva=21, 11d4093
grub-core/fs/zfs/zfs.c:2504: zap read
grub-core/fs/zfs/zfs.c:2508: micro zap
grub-core/fs/zfs/zfs.c:2511: returned 5

On the other hand, it was able to list aac.ko in the same directory. So with
this version of grub2 all feature flags seem to be available to grub2 (I have
them all activated in this particular pool).
However, this time I wasn't able to install it on a full-disk ZFS filesystem:
grub-install: warning: Attempting to install GRUB to a disk with multiple
partition labels.  This is not supported yet..
sbin/grub-install: error: filesystem `zfs' doesn't support blocklists.

With the last official beta release it WAS possible.

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