diff --git a/community/ghc/MADV_FREE.patch b/community/ghc/MADV_FREE.patch
new file mode 100644
index 000000000..067200172
--- /dev/null
+++ b/community/ghc/MADV_FREE.patch
@@ -0,0 +1,63 @@
+From 6576bf83cdf4eac05eb88a24aa934a736c91e3da Mon Sep 17 00:00:00 2001
+From: Ben Gamari <bgamari.foss@gmail.com>
+Date: Thu, 1 Dec 2016 12:55:23 -0500
+Subject: [PATCH] rts: Ensure we always give MADV_DONTNEED a chance in
+ osDecommitMemory
+
+As described in #12865, newer Linux kernels support both MADV_FREE and
+MADV_DONTNEED. Previously a runtime would fail to try MADV_DONTNEED if
+MADV_FREE failed (e.g. since the kernel which the image is running on
+doesn't support the latter). Now we try MADV_DONTNEED if MADV_FREE
+failed to ensure that binaries compiled on a kernel supporting MADV_FREE
+don't fail on decommit.
+
+Test Plan: Validate
+
+Reviewers: austin, erikd, simonmar
+
+Reviewed By: simonmar
+
+Subscribers: thomie
+
+Differential Revision: https://phabricator.haskell.org/D2780
+
+GHC Trac Issues: #12865
+---
+ rts/posix/OSMem.c | 19 ++++++++++++++++---
+ 1 file changed, 16 insertions(+), 3 deletions(-)
+
+diff --git a/rts/posix/OSMem.c b/rts/posix/OSMem.c
+index 5291745..beffeda 100644
+--- a/rts/posix/OSMem.c
++++ b/rts/posix/OSMem.c
+@@ -541,11 +541,24 @@ void osDecommitMemory(void *at, W_ size)
+ 
+ #ifdef MADV_FREE
+     // Try MADV_FREE first, FreeBSD has both and MADV_DONTNEED
+-    // just swaps memory out
++    // just swaps memory out. Linux >= 4.5 has both DONTNEED and FREE; either
++    // will work as they both allow the system to free anonymous pages.
++    // It is important that we try both methods as the kernel which we were
++    // built on may differ from the kernel we are now running on.
+     r = madvise(at, size, MADV_FREE);
+-#else
+-    r = madvise(at, size, MADV_DONTNEED);
++    if(r < 0) {
++        if (errno == EINVAL) {
++            // Perhaps the system doesn't support MADV_FREE; fall-through and
++            // try MADV_DONTNEED.
++        } else {
++            sysErrorBelch("unable to decommit memory");
++        }
++    } else {
++        return;
++    }
+ #endif
++
++    r = madvise(at, size, MADV_DONTNEED);
+     if(r < 0)
+         sysErrorBelch("unable to decommit memory");
+ }
+-- 
+1.9.1
+
diff --git a/community/ghc/PKGBUILD b/community/ghc/PKGBUILD
index 7ad1df92a..5aa334221 100644
--- a/community/ghc/PKGBUILD
+++ b/community/ghc/PKGBUILD
@@ -19,7 +19,7 @@ buildarch=4
 pkgbase=ghc
 pkgname=(ghc ghc-static)
 pkgver=8.0.2
-pkgrel=2
+pkgrel=3
 pkgdesc='The Glasgow Haskell Compiler'
 arch=('i686' 'x86_64')
 url='http://www.haskell.org/ghc/'
@@ -27,12 +27,13 @@ license=('custom')
 makedepends=('ghc-static' 'perl' 'libxslt' 'docbook-xsl' 'python-sphinx' 'haskell-hscolour'
              'texlive-bin' 'texlive-latexextra' 'ttf-dejavu')
 source=("https://downloads.haskell.org/~ghc/$pkgver/$pkgname-${pkgver}-src.tar.xz"
-        ghc-rebuild-doc-index.hook ghc-register.hook ghc-unregister.hook)
+        ghc-rebuild-doc-index.hook ghc-register.hook ghc-unregister.hook MADV_FREE.patch)
 noextract=("$pkgname-${pkgver}-src.tar.xz")
 md5sums=('d0afb5ec441b14527a53d2445cc26ec3'
          'cc9aa11fddde15d8e5e15e99748874a1'
          '3b1949e77038b0276ebd5590ab89e1af'
-         '587efb0cb73a6b336cd9333fc5697de4')
+         '587efb0cb73a6b336cd9333fc5697de4'
+         '3bf341c04e2e501a5ace07127de23e8f')
 
 prepare() {
   # Need to extract this tarball with a UTF-8 locale instead of a chroot's "C"
@@ -41,6 +42,8 @@ prepare() {
   LANG=en_US.UTF-8 bsdtar xf $pkgname-${pkgver}-src.tar.xz
 
   cd ghc-$pkgver
+  # FS#54823
+  patch -p1 -i ../MADV_FREE.patch
 
   cp mk/build.mk{.sample,}
   sed -i '1iBuildFlavour = perf' mk/build.mk
@@ -140,7 +143,7 @@ package_ghc() {
 
   install -Dm644 LICENSE "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
 
-  # Remove static libs and the compiler itself, but keep ghc-pkg for library (un)register
+  # Remove static libs
   find "$pkgdir"/usr/lib \( -name "*.a" -o -name "*.p_hi" \) -delete
 
   install -Dm644 utils/completion/ghc.bash \