unable to read RDB block due to b9684a71fca793

[Bagas Sanjaya <bagasdotme@gmail.com>]

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Hi,

I first noticed this issue on v5.18.9, and still found on v5.19-rc5.

Looking at dmesg, I see error message on loop8 device:

[   41.319699] Dev loop8: unable to read RDB block 8
[   41.320566]  loop8: unable to read partition table
[   41.320597] loop8: partition table beyond EOD, truncated

My Debian 11 laptop is also run LXD (as development server).

Bisecting between v5.18 and v5.19-rc5, the culprit is commit b9684a71fca793
("block, loop: support partitions without scanning").

Here's the bisection log:

git bisect start '--term-good=ok' '--term-bad=oops'
# status: waiting for both good and bad commits
# oops: [88084a3df1672e131ddc1b4e39eeacfd39864acf] Linux 5.19-rc5
git bisect oops 88084a3df1672e131ddc1b4e39eeacfd39864acf
# status: waiting for good commit(s), bad commit known
# ok: [4b0986a3613c92f4ec1bdc7f60ec66fea135991f] Linux 5.18
git bisect ok 4b0986a3613c92f4ec1bdc7f60ec66fea135991f
# ok: [fbe86daca0ba878b04fa241b85e26e54d17d4229] Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
git bisect ok fbe86daca0ba878b04fa241b85e26e54d17d4229
# ok: [2536b2ca15418c517e3629cc3dd757f811ce52b2] virtio: use virtio_device_ready() in virtio_device_restore()
git bisect ok 2536b2ca15418c517e3629cc3dd757f811ce52b2
# oops: [6f9b5ed8caddfbc94af8307c557ed57a8ec5c65c] Merge tag 'char-misc-5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
git bisect oops 6f9b5ed8caddfbc94af8307c557ed57a8ec5c65c
# oops: [04d93b2b8bc7a68ec45a6a156f34a611ede5aa60] Merge tag 'spdx-5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/spdx
git bisect oops 04d93b2b8bc7a68ec45a6a156f34a611ede5aa60
# ok: [55fe92179058406fe00bff2167c94443a7b2e07a] Merge tag 'i3c/for-5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux
git bisect ok 55fe92179058406fe00bff2167c94443a7b2e07a
# ok: [96479c09803b21d195c95fd4b145cd3a5a591ba0] Merge tag 'arm-multiplatform-5.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
git bisect ok 96479c09803b21d195c95fd4b145cd3a5a591ba0
# ok: [ab18b7b36a82b1900687c5718f7d46f0d8e77d86] Merge tag 'drm-next-2022-06-03-1' of git://anongit.freedesktop.org/drm/drm
git bisect ok ab18b7b36a82b1900687c5718f7d46f0d8e77d86
# ok: [5ac8bdb9ad47334a9590e29daf7e4149b0a34729] Merge tag 'io_uring-5.19-2022-06-02' of git://git.kernel.dk/linux-block
git bisect ok 5ac8bdb9ad47334a9590e29daf7e4149b0a34729
# oops: [aacae8c469f9ce4b303a2eb61593ff522c1420bc] block: null_blk: Fix null_zone_write()
git bisect oops aacae8c469f9ce4b303a2eb61593ff522c1420bc
# oops: [7d6b902ea0e02b2a25c480edf471cbaa4ebe6b3c] bcache: memset on stack variables in bch_btree_check() and bch_sectors_dirty_init()
git bisect oops 7d6b902ea0e02b2a25c480edf471cbaa4ebe6b3c
# ok: [df7e7f2ba0781528e63f04b108819a4ab9889c72] Merge branch 'md-next' of https://git.kernel.org/pub/scm/linux/kernel/git/song/md into for-5.19/drivers
git bisect ok df7e7f2ba0781528e63f04b108819a4ab9889c72
# ok: [80db4e4707e78cb22287da7d058d7274bd4cb370] bcache: remove incremental dirty sector counting for bch_sectors_dirty_init()
git bisect ok 80db4e4707e78cb22287da7d058d7274bd4cb370
# oops: [b9684a71fca793213378dd410cd11675d973eaa1] block, loop: support partitions without scanning
git bisect oops b9684a71fca793213378dd410cd11675d973eaa1
# ok: [32feee36c30ea06e38ccb8ae6e5c44c6eec790a6] bcache: avoid journal no-space deadlock by reserving 1 journal bucket
git bisect ok 32feee36c30ea06e38ccb8ae6e5c44c6eec790a6
# first oops commit: [b9684a71fca793213378dd410cd11675d973eaa1] block, loop: support partitions without scanning

Attached is the config to reproduce.

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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