[Pkg-xen-devel] Bug#963607: xen-hypervisor-4.11-amd64: Xen Hypervisor kernel fails to load arcmsr module with "arcmsr0: dma_alloc_coherent got error" message.

[Alex Sanderson]

Package: xen-hypervisor-4.11-amd64
Version: 4.11.3+24-g14b62ab3e5-1~deb10u1
Severity: important

Dear Maintainer,

After updating to Buster and Xen 4.11 our machine no longer boots the Xen kernel.  The default kernel 4.19.118-2+deb10u1 boots normally. 

The machine has an Areca 1882IX-16 card in it when the arcmsr module
tries to load the following error appears. 

	Areca RAID Controller0: Model ARC-1882, F/W V1.56 2019-07-30
	arcmsr0: dma_alloc_coherent got error

No drives are discovered and the initramfs prompt is shown.  

The machine:
 * Supermicro X9DRW 
 * Dual Intel(R) Xeon(R) CPU E5-2630L v2 @ 2.40GHz
 * 128G RAM
 * Areca ARC-1882IX-16 (1G onboard cache)

Nothing I have tried is effective:
 * Turning on BIOS above 4G decoding stops the Intel 10GBE ixgbe driver from functioning and doesn't fix the arcmsr
 * Unloading and reloading the arcmsr module from initramfs prompt
 * Downgrading the Areca 1882 bios to v1.52 as per http://faq.areca.com.tw/index.php?action=artikel&cat=7&id=902&artlang=en
 * Kernel parameters
 ** pci=nocrs 
 ** dom0_mem=8G 
 ** mem=3072M
 ** mem2048M cma=1024M
 ** cma=2048
 ** cma=3076 at 512M
 ** iommu=1 intel_iommu=1 
 ** arcmsr.host_can_queue=64 as per http://faq.areca.com.tw/index.php?action=artikel&cat=15&id=387&artlang=en

I expected the arcmsr module to load and detect disks as it does with
the stock kernel.

I can provide sysctl and dmesg output if it helps.


-- System Information:
Debian Release: 10.4
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-9-amd64 (SMP w/24 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

xen-hypervisor-4.11-amd64 depends on no packages.

Versions of packages xen-hypervisor-4.11-amd64 recommends:
ii  xen-hypervisor-common  4.11.3+24-g14b62ab3e5-1~deb10u1
ii  xen-utils-4.11         4.11.3+24-g14b62ab3e5-1~deb10u1

xen-hypervisor-4.11-amd64 suggests no packages.

-- no debconf information