Bug #36030: CRC is always zero on AArch64 systems supporting crc32cx if the build host does not support crc32cx - Messengers - Ceph

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Bug #36030

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CRC is always zero on AArch64 systems supporting crc32cx if the build host does not support crc32cx

Added by David Wang over 5 years ago. Updated about 5 years ago.

Status:

Fix Under Review

Priority:

Normal

Assignee:

Category:

Target version:

% Done:

Source:

Tags:

Backport:

luminous, mimic

Regression:

Yes

Severity:

3 - minor

Reviewed:

Affected Versions:

ceph-qa-suite:

Pull request ID:

Crash signature (v1):

Crash signature (v2):

Description

This is the same story as http://tracker.ceph.com/issues/19705

If the build host does not support the crc32cx instruction, HAVE_ARMV8_CRC will not be set and ceph_crc32c_aarch64 will be a dummy function that always returns zero. However, if HWCAP_CRC32 is supported on the actual target machine, that dummy function will be selected anyway.

In particular, the Debian packages offered at https://download.ceph.com/debian-luminous suffer from this issue and so it is not possible for clients using those packages running on an AArch64 machine that supports the crc32cx instruction from connecting to non-buggy Ceph services. Likewise it is not possible for non-buggy clients to connect to Ceph services using those packages running on an AArch64 machine that supports the crc32cx instruction.