Verification done on xenial-proposed.
The kernel in -proposed logs the block size change.
The kernel in -updates fails.
xenial-proposed:
---
$ uname -rv
4.4.0-187-generic #217-Ubuntu SMP Tue Jul 21 04:18:15 UTC 2020
$ apt-cache madison linux-image-4.4.0-187-generic
linux-image-4.4.0-187-generic | 4.4.0-187.217 |
http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 Packages
$ sudo make-bcache --bdev $DEV --block 8k
...
[ 88.514012] bcache: bcache_device_init() bcache0: sb/logical block
size (8192) greater than page size (4096) falling back to device logical block
size (512)
[ 88.516852] bcache: register_bdev() registered backing device loop0
xenial-updates:
---
$ uname -rv
4.4.0-186-generic #216-Ubuntu SMP Wed Jul 1 05:34:05 UTC 2020
$ apt-cache madison linux-image-4.4.0-186-generic | grep updates
linux-image-4.4.0-186-generic | 4.4.0-186.216 |
http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
$ sudo make-bcache --bdev $DEV --block 8k
...
[ 56.341127] bcache: register_bdev() registered backing device loop0
[ 56.344996] BUG: unable to handle kernel NULL pointer dereference at
0000000000000098
[ 56.346996] IP: [<ffffffff8125acb0>] bdev_read_page+0x10/0xb0
...
[ 56.379801] Call Trace:
[ 56.380315] [<ffffffff81261bbe>] do_mpage_readpage+0x52e/0x7a0
[ 56.381452] [<ffffffff8125a6b0>] ? I_BDEV+0x20/0x20
[ 56.382550] [<ffffffff811abebe>] ? lru_cache_add+0xe/0x10
[ 56.383544] [<ffffffff81261f42>] mpage_readpages+0x112/0x190
[ 56.384508] [<ffffffff8125a6b0>] ? I_BDEV+0x20/0x20
[ 56.385369] [<ffffffff8125a6b0>] ? I_BDEV+0x20/0x20
[ 56.386196] [<ffffffff811f09dc>] ? alloc_pages_current+0x8c/0x110
[ 56.387279] [<ffffffff8125b1cd>] blkdev_readpages+0x1d/0x20
[ 56.388316] [<ffffffff811a9f39>]
__do_page_cache_readahead+0x199/0x240
[ 56.389394] [<ffffffff811aa34a>]
force_page_cache_readahead+0xaa/0x100
[ 56.390445] [<ffffffff811aa3df>] page_cache_sync_readahead+0x3f/0x50
[ 56.391600] [<ffffffff8119d0ba>] generic_file_read_iter+0x54a/0x6b0
[ 56.392734] [<ffffffff8125bcc5>] blkdev_read_iter+0x35/0x40
[ 56.393658] [<ffffffff8121e14e>] new_sync_read+0x9e/0xe0
[ 56.394620] [<ffffffff8121e1b9>] __vfs_read+0x29/0x40
[ 56.395540] [<ffffffff8121e926>] vfs_read+0x86/0x130
[ 56.396373] [<ffffffff8121f67c>] SyS_read+0x5c/0xe0
[ 56.397192] [<ffffffff8186991b>] entry_SYSCALL_64_fastpath+0x22/0xd0
...
** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial
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https://bugs.launchpad.net/bugs/1867916
Title:
Regression in kernel 4.15.0-91 causes kernel panic with Bcache
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