From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([209.51.188.92]:60784) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hJ4Pq-0003xA-PK for qemu-devel@nongnu.org; Tue, 23 Apr 2019 19:01:32 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hJ4Po-0007Xi-Jq for qemu-devel@nongnu.org; Tue, 23 Apr 2019 19:01:30 -0400 Received: from indium.canonical.com ([91.189.90.7]:51502) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1hJ4Po-0007Lu-9F for qemu-devel@nongnu.org; Tue, 23 Apr 2019 19:01:28 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.86_2 #2 (Debian)) id 1hJ4Pc-0008AE-40 for ; Tue, 23 Apr 2019 23:01:16 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id F0B1F2E80D7 for ; Tue, 23 Apr 2019 23:01:15 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Tue, 23 Apr 2019 22:50:30 -0000 From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= <1804678@bugs.launchpad.net> Reply-To: Bug 1804678 <1804678@bugs.launchpad.net> Sender: bounces@canonical.com References: <154290401870.17569.13384923487355075536.malonedeb@chaenomeles.canonical.com> Message-Id: <155605983209.7008.10017664640038839721.launchpad@chaenomeles.canonical.com> Errors-To: bounces@canonical.com Subject: [Qemu-devel] [Bug 1804678] Re: qemu-3.1.0-rc0: mips emulation hangs when executing invalid instructions List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org ** Changed in: qemu Status: New =3D> Confirmed -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1804678 Title: qemu-3.1.0-rc0: mips emulation hangs when executing invalid instructions Status in QEMU: Confirmed Bug description: QEMU version: ------------- qemu-3.1.0-rc0 compiled from sources (earlier versions also affected) Summary: -------- QEMU MIPS system emulation hangs when trying to execute the following invalid instructions: 71c5a9bf sdbbp 0x716a6 2c4745aa sltiu a3, v0, 0x45aa f47539fb sdc1 f21, 0x39fb(v1) 5fa5e284 invalid qemu-system-mips falls under an infinite loop condition and it needs to be ended. The issue has been reproduced in Ubuntu x64 host running Debian MIPS 32-bits guest with the following command line: qemu-system-mips -M malta -kernel vmlinux-3.2.0-4-4kc-malta -hda debian_wheezy_mips_standard.qcow2 -append "root=3D/dev/sda1 console=3Dtty0" It can also be reproduced using mips-linux-user, in which case throws the following exception: qemu-mips mips_loop_static.elf qemu: unhandled CPU exception 0x10 - aborting pc=3D0x004a9da0 HI=3D0x00000003 LO=3D0x00000002 ds 00e2 004a9da0 0 GPR00: r0 00000000 at fffffff8 v0 004a9da0 v1 004ad000 GPR04: a0 00000001 a1 7fffefc4 a2 7fffefcc a3 00000000 GPR08: t0 004ab854 t1 0ffffffe t2 81010100 t3 2f2f2f2f GPR12: t4 7ffff1ad t5 004ab090 t6 004ab06c t7 004ab07c GPR16: s0 00000000 s1 452ac505 s2 00400db4 s3 00400d38 GPR20: s4 00000000 s5 00000000 s6 00000000 s7 00000000 GPR24: t8 004ab0a8 t9 004a9da0 k0 00000000 k1 00000000 GPR28: gp 004b25a0 sp 7fffeec0 s8 7fffeec0 ra 0040041c CP0 Status 0x24000010 Cause 0x00000000 EPC 0x00000000 Config0 0x80008482 Config1 0x9e190c8f LLAddr 0xffffffffffffffff Config2 0x80000000 Config3 0x00000000 Config4 0x00000000 Config5 0x00000000 qemu:handle_cpu_signal received signal outside vCPU context @ pc=3D0x602d= bad8 Testcase: --------- C program to reproduce the problem: unsigned char code[] =3D "\x71\xC5\xA9\xBF\x2C\x47\x45\xAA\xF4\x75\x39\xF= B\x5F\xA5\xE2\x84"; main() { int (*ret)() =3D (int(*)())code; ret(); } Also, find a statically compiled ELF attached. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1804678/+subscriptions