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This change has been made by an automated script, maintained by the
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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2016040
Title:
Creating bcache backing device using a Dell Ent NVMe CM6 MU 6.4TB
storage fails with "cannot allocate memory" error
Status in linux package in Ubuntu:
Incomplete
Bug description:
# make-bcache -B /dev/nvme4n1
UUID: 569e90b3-cc2a-4a0e-a201-476c426a2141
Set UUID: d8d8458a-01df-481e-a7dc-e75843a9608f
version: 1
block_size: 1
data_offset: 16
kern.log:
Apr 12 18:21:56 pc6a-rb3-n2 kernel: [ 723.854659] bcache: register_bdev()
error nvme4n1: cannot allocate memory
Apr 12 18:21:56 pc6a-rb3-n2 kernel: [ 723.854662] bcache:
register_bdev_worker() error /dev/nvme4n1: fail to register backing device
Same error message is mentioned in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1909518, but the
suggested configuration change does not fix the issue:
# nvme id-ns /dev/nvme4n1 -n 1 -H |grep "LBA Format"
[3:0] : 0x3 Current LBA Format Selected
LBA Format 0 : Metadata Size: 0 bytes - Data Size: 512 bytes - Relative
Performance: 0 Best
LBA Format 1 : Metadata Size: 8 bytes - Data Size: 512 bytes - Relative
Performance: 0 Best
LBA Format 2 : Metadata Size: 0 bytes - Data Size: 1 bytes - Relative
Performance: 0 Best
LBA Format 3 : Metadata Size: 0 bytes - Data Size: 4096 bytes - Relative
Performance: 0 Best (in use)
LBA Format 4 : Metadata Size: 8 bytes - Data Size: 4096 bytes - Relative
Performance: 0 Best
LBA Format 5 : Metadata Size: 64 bytes - Data Size: 4096 bytes - Relative
Performance: 0 Best
Using a Dell Ent NVMe P5800x WI U.2 400GB storage works as expected:
# make-bcache -B /dev/nvme2n1
UUID: b1405a6d-8732-4175-8aba-d67be23b3ff0
Set UUID: af6b190f-a57e-4f2b-926e-904a95268390
version: 1
block_size: 8
data_offset: 16
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
...
nvme2n1 259:1 0 372.6G 0 disk
└─bcache0 252:0 0 372.6G 0 disk
...
kern.log:
Apr 12 18:47:33 pc6a-rb3-n2 kernel: [ 2261.135332] bcache: register_bdev()
registered backing device nvme2n1
Kernel versions tested:
5.19.0-38-generic #39~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC
5.15.0-69-generic #76-Ubuntu SMP
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