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Sat, 10 Jul 2021 04:26:11 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Sat, 10 Jul 2021 04:17:27 -0000 From: Launchpad Bug Tracker <1874888@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=Expired; importance=Undecided; assignee=None; X-Launchpad-Bug-Tags: i386 tcg X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: janitor skotik th-huth X-Launchpad-Bug-Reporter: Konstantin (skotik) X-Launchpad-Bug-Modifier: Launchpad Janitor (janitor) References: <158775385817.8537.12364422091879172270.malonedeb@gac.canonical.com> Message-Id: <162589064759.5654.8103306234760131348.malone@loganberry.canonical.com> Subject: [Bug 1874888] Re: certain programs make QEMU crash with "tcg fatal error" X-Launchpad-Message-Rationale: Subscriber (QEMU) @qemu-devel-ml X-Launchpad-Message-For: qemu-devel-ml Precedence: bulk X-Generated-By: Launchpad (canonical.com); Revision="1b66c075b8638845e61f40eb9036fabeaa01f591"; Instance="production" X-Launchpad-Hash: 8afe9167240ddf4cd6403ea164c22477ccaac781 Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Bug 1874888 <1874888@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" [Expired for QEMU because there has been no activity for 60 days.] ** Changed in: qemu Status: Incomplete =3D> Expired -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1874888 Title: certain programs make QEMU crash with "tcg fatal error" Status in QEMU: Expired Bug description: The following code snippet crashes qemu with .../tcg/tcg.c:3279: tcg fatal error qemu-x86_64: /usr/local/google/home/kostik/qemu-5.0.0-rc4/accel/tcg/cpu-e= xec.c:701: int cpu_exec(CPUState *): Assertion `!have_mmap_lock()' failed. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D int main() { /* 00000000 <.data>: 0: 2e 45 71 ff cs rex.RB jno 0x3 4: e9 00 00 f0 00 jmp 0xf00009 9: c4 42 7d 31 3e vpmovzxbd ymm15,QWORD PTR [r14] e: c4 a3 7d 08 64 82 44 vroundps ymm4,YMMWORD PTR [rdx+r8*4+0x44]= ,0x0 15: 00 = 16: 0f 1e 0a nop DWORD PTR [rdx] 19: 43 0f ec 20 rex.XB paddsb mm4,QWORD PTR [r8] 1d: 66 47 0f 3a 0c 3d 00 rex.RXB blendps xmm15,XMMWORD PTR [rip+0x= 8000],0x0 # 0x8028 24: 80 00 00 00 = 28: c4 e3 f9 df 5f 86 0d vaeskeygenassist xmm3,XMMWORD PTR [rdi-0x= 7a],0xd 2f: c4 e2 55 92 74 fc 0a vgatherdps ymm6,DWORD PTR [rsp+ymm7*8+0xa= ],ymm5 36: c4 e2 f9 17 9a 01 00 vptest xmm3,XMMWORD PTR [rdx+0x1] 3d: 00 00 = */ char buf[] =3D { 0x2E, 0x45, 0x71, 0xFF, 0xE9, 0x00, 0x00, 0xF0, 0x00, 0xC4, 0x42, 0x7= D, 0x31, 0x3E, 0xC4, 0xA3, 0x7D, 0x08, 0x64, 0x82, 0x44, 0x00, 0x0F, 0x1E, = 0x0A, 0x43, 0x0F, 0xEC, 0x20, 0x66, 0x47, 0x0F, 0x3A, 0x0C, 0x3D, 0x00, 0x8= 0, 0x00, 0x00, 0x00, 0xC4, 0xE3, 0xF9, 0xDF, 0x5F, 0x86, 0x0D, 0xC4, 0xE2, = 0x55, 0x92, 0x74, 0xFC, 0x0A, 0xC4, 0xE2, 0xF9, 0x17, 0x9A, 0x01, 0x00, 0x0= 0, 0x00 }; void (*f)(void) =3D (void (*) (void))buf; f(); return 0; } =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Steps to reproduce: 1) clang -static repro.c -o repro 2) qemu-x86_64-static repro Tested with 4.2.0 and 5.0.0-rc4. Both -user and -system variants are affected. A few more snippets that cause the same sort of behavior: 1) 0x64, 0x46, 0x7D, 0xFF, 0xDF, 0x27, 0x46, 0x0F, 0xD4, 0x83, 0x5E, 0x00= , 0x00, 0x00, 0x3E, 0x0F, 0x6A, 0xEF, 0x0F, 0x05, 0xC4, 0x42, 0xFD, 0x1E, 0= xCF, 0x46, 0x18, 0xE3, 0x47, 0xCD, 0x4E, 0x6E, 0x0F, 0x0F, 0x16, 0x8A 2) 0x67, 0x45, 0xDB, 0xD0, 0xAA, 0xC4, 0xE2, 0xB1, 0x01, 0x57, 0x00, 0xF3, 0x6F, 0xF3, 0x42, 0x0F, 0x1E, 0xFD, 0x64, 0x2E, 0xF2, 0x45, 0xD9, 0xC4, 0x3E, 0xF3, 0x0F, 0xAE, 0xF4, 0x3E, 0x47, 0x0F, 0x1C, 0x22, 0x42, 0x73, 0xFF, 0xD9, 0xFD To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1874888/+subscriptions