[Buildroot] [PATCH] utils/genrandconfig: reject qemu user mode on hosts with large pages

* [Buildroot] [PATCH] utils/genrandconfig: reject qemu user mode on hosts with large pages
@ 2026-09-29  9:07 Yegor Yefremov via buildroot
  2026-10-07  7:58 ` Thomas Petazzoni via buildroot
  0 siblings, 1 reply; 2+ messages in thread
From: Yegor Yefremov via buildroot @ 2026-09-29  9:07 UTC (permalink / raw)
  To: buildroot; +Cc: James Hilliard

Qemu in user mode cannot load target binaries laid out for 4k pages
when the host uses larger pages, as the 16k pages of the Asahi Linux
kernel on Apple Silicon. The dynamic loader then fails with e.g.:

  GLib-2.0: error while loading shared libraries: libz.so.1: failed
  to map segment from shared object

or, depending on the target:

  qemu-aarch64: .../GLib-2.0: Error mapping file: Invalid argument
  torque: error while loading shared libraries: libz.so.1: ELF load
  command address/offset not page-aligned

This hits every package running target code through qemu at build
time, i.e. gobject-introspection and nodejs, on mips, sparc64 and
aarch64 alike, and is not something Buildroot can fix in the
packages themselves.

As this only depends on the build host, reject such configurations
in genrandconfig when the host page size is larger than 4k.

Fixes:
https://autobuild.buildroot.org/results/4848e735fe83dfeef4f24d32655c567951fd113a (mips)
https://autobuild.buildroot.org/results/089ddac5bdaaf5650cbc5c26d48952b5bede0ca6 (sparc64)
https://autobuild.buildroot.org/results/c30c6719a0350370ebe3cfe262123727f4057734 (aarch64)

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Assisted-by: Claude:claude-opus-5-5
---
 utils/genrandconfig | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/utils/genrandconfig b/utils/genrandconfig
index 727c8193c4..8437d6342d 100755
--- a/utils/genrandconfig
+++ b/utils/genrandconfig
@@ -124,6 +124,13 @@ async def fixup_config(sysinfo, configfile):
     if 'BR2_PACKAGE_LIBOPENSSL=y\n' in configlines and \
        'BR2_TOOLCHAIN_HAS_ATOMIC=y\n' not in configlines:
         return False
+    # Qemu in user mode cannot load target binaries laid out for 4k
+    # pages on a host with larger pages (e.g. 16k on Apple Silicon),
+    # so packages running target code at build time (gobject-
+    # introspection, nodejs) fail there.
+    if 'BR2_PACKAGE_HOST_QEMU_LINUX_USER_MODE=y\n' in configlines and \
+       os.sysconf('SC_PAGE_SIZE') > 4096:
+        return False
     if 'BR2_PACKAGE_SUNXI_BOARDS=y\n' in configlines:
         configlines.remove('BR2_PACKAGE_SUNXI_BOARDS_FEX_FILE=""\n')
         configlines.append('BR2_PACKAGE_SUNXI_BOARDS_FEX_FILE="a10/hackberry.fex"\n')
-- 
2.34.1

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