Bug#945213: linux-image-5.2.0-3-amd64: OOM handling broken if hugepages are enabled

From	Anton Ivanov <anton.ivanov@kot-begemot.co.uk>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#945213: linux-image-5.2.0-3-amd64: OOM handling broken if hugepages are enabled
Date	2019-11-21 10:30 +0100
Message-ID	<z4QWJ-2y2-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Package: linux-image-5.2.0-3-amd64
Version: 5.2.17+1
Severity: important

Dear Maintainer,

Dear Maintainer,

OOM handling appears to be broken in 5.2.17-1 if hugepages are enabled.

Test system: AMD A4-5300, 40G RAM, no swap, booted disklessly.

Without hugepages enabled can compile dpdk without any issues. With huge
pages enabled it will reproducibly OOM when trying to link one of the
libraries. There are 20G+ free RAM at that point according to free with the
rest being mostly used as buffers.

It is sufficient to just enable huge pages to trigger this (2G out of 40G),
they are not allocated or used by anything. 


-- System Information:
Debian Release: 10.2
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.2.0-3-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

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Bug#945213: linux-image-5.2.0-3-amd64: OOM handling broken if hugepages are enabled Anton Ivanov <anton.ivanov@kot-begemot.co.uk> - 2019-11-21 10:30 +0100
  Bug#945213: linux-image-5.2.0-3-amd64: OOM handling broken if hugepages are enabled Ben Hutchings <ben@decadent.org.uk> - 2019-11-22 20:40 +0100
    Bug#945213: linux-image-5.2.0-3-amd64: OOM handling broken if hugepages are enabled Anton Ivanov <anton.ivanov@kot-begemot.co.uk> - 2019-11-23 00:00 +0100
  Processed: Re: Bug#945213: linux-image-5.2.0-3-amd64: OOM  handling broken if hugepages are enabled "Debian Bug Tracking System" <owner@bugs.debian.org> - 2019-11-22 20:40 +0100

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