Bug 8888

Summary:	qemu-x86-64 crashes when running postinst intercepts
Product:	[Build System, Metadata & Runtime] OE-Core	Reporter:	Ross Burton <ross.burton>
Component:	devtools / tool chain	Assignee:	Ross Burton <ross.burton>
Status:	VERIFIED FIXED	QA Contact:	Alexandru Roman <alexandru.costinx.roman>
Severity:	normal
Priority:	High	CC:	alexandru.costinx.roman, meta.mr.watcher, meta.watcher
Version:	2.0
Target Milestone:	2.1 M3
Hardware:	All
OS:	Multiple
Whiteboard:
OS type for building Yocto:	---	Type of Regression:	---
Verified:		Documentation change:	No (bug/feature does not impact docs)

Description Ross Burton 2016-01-06 15:54:11 UTC

If I build core-image-sato for intel-corei7-64 I end up with core dumps in my build directory because qemu segfaulted:

NOTE: Running intercept scripts:
NOTE: > Executing update_font_cache intercept ...
qemu: uncaught target signal 4 (Illegal instruction) - core dumped
Illegal instruction

I'm guessing the target binaries are using instructions that qemu doesn't support?

Comment 1 Cristian Iorga 2016-01-07 16:23:35 UTC

Investigation started.

Comment 2 Ross Burton 2016-01-07 17:20:08 UTC

Just to update the bug, there are several places where this could have gone wrong:

1. regression into qemu
2. new compiler	using new opcodes that qemu doesn't support
3. software using new opcodes that qemu doesn't support
4. wrong cpu type being passed to qemu in the wrapper

Comment 3 Ross Burton 2016-02-08 14:15:11 UTC

fontconfig is executing the popcnt instruction that is part of SSE4.2, as requested by tune-corei7.inc.

Testing a patch to tell qemu.bbclass to pass -cpu Nelhalem so this instruction is emulated.

Comment 4 Ross Burton 2016-02-08 15:16:32 UTC

Patch posted.

Comment 5 Ross Burton 2016-02-11 14:13:09 UTC

Fixed in oe-core fef106b9b97ec48bad2b9a084357b884f653d6c8.

Comment 6 Alexandru Roman 2016-03-01 08:04:38 UTC

Verified on master: 4006a7f2762ccd5dcbc6cdff49482d4387a73261