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Mon, 19 Aug 2019 12:03:17 +0000 (UTC) From: David Hildenbrand To: Laurent Vivier , Richard Henderson , Riku Voipio , Cornelia Huck , qemu-s390x , "qemu-devel@nongnu.org" References: <8fb538f3-dfdd-b427-727a-2e7c2120da09@gmail.com> <20e800e8-846b-a9c3-f840-826238b0818f@redhat.com> <1d5e9145-42d7-8ab3-cc9f-7ec4eb00758c@redhat.com> Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; prefer-encrypt=mutual; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwX4EEwECACgFAljj9eoCGwMFCQlmAYAGCwkI BwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEE3eEPcA/4Na5IIP/3T/FIQMxIfNzZshIq687qgG 8UbspuE/YSUDdv7r5szYTK6KPTlqN8NAcSfheywbuYD9A4ZeSBWD3/NAVUdrCaRP2IvFyELj xoMvfJccbq45BxzgEspg/bVahNbyuBpLBVjVWwRtFCUEXkyazksSv8pdTMAs9IucChvFmmq3 jJ2vlaz9lYt/lxN246fIVceckPMiUveimngvXZw21VOAhfQ+/sofXF8JCFv2mFcBDoa7eYob s0FLpmqFaeNRHAlzMWgSsP80qx5nWWEvRLdKWi533N2vC/EyunN3HcBwVrXH4hxRBMco3jvM m8VKLKao9wKj82qSivUnkPIwsAGNPdFoPbgghCQiBjBe6A75Z2xHFrzo7t1jg7nQfIyNC7ez MZBJ59sqA9EDMEJPlLNIeJmqslXPjmMFnE7Mby/+335WJYDulsRybN+W5rLT5aMvhC6x6POK z55fMNKrMASCzBJum2Fwjf/VnuGRYkhKCqqZ8gJ3OvmR50tInDV2jZ1DQgc3i550T5JDpToh dPBxZocIhzg+MBSRDXcJmHOx/7nQm3iQ6iLuwmXsRC6f5FbFefk9EjuTKcLMvBsEx+2DEx0E UnmJ4hVg7u1PQ+2Oy+Lh/opK/BDiqlQ8Pz2jiXv5xkECvr/3Sv59hlOCZMOaiLTTjtOIU7Tq 7ut6OL64oAq+zsFNBFXLn5EBEADn1959INH2cwYJv0tsxf5MUCghCj/CA/lc/LMthqQ773ga uB9mN+F1rE9cyyXb6jyOGn+GUjMbnq1o121Vm0+neKHUCBtHyseBfDXHA6m4B3mUTWo13nid 0e4AM71r0DS8+KYh6zvweLX/LL5kQS9GQeT+QNroXcC1NzWbitts6TZ+IrPOwT1hfB4WNC+X 2n4AzDqp3+ILiVST2DT4VBc11Gz6jijpC/KI5Al8ZDhRwG47LUiuQmt3yqrmN63V9wzaPhC+ xbwIsNZlLUvuRnmBPkTJwwrFRZvwu5GPHNndBjVpAfaSTOfppyKBTccu2AXJXWAE1Xjh6GOC 8mlFjZwLxWFqdPHR1n2aPVgoiTLk34LR/bXO+e0GpzFXT7enwyvFFFyAS0Nk1q/7EChPcbRb hJqEBpRNZemxmg55zC3GLvgLKd5A09MOM2BrMea+l0FUR+PuTenh2YmnmLRTro6eZ/qYwWkC u8FFIw4pT0OUDMyLgi+GI1aMpVogTZJ70FgV0pUAlpmrzk/bLbRkF3TwgucpyPtcpmQtTkWS gDS50QG9DR/1As3LLLcNkwJBZzBG6PWbvcOyrwMQUF1nl4SSPV0LLH63+BrrHasfJzxKXzqg rW28CTAE2x8qi7e/6M/+XXhrsMYG+uaViM7n2je3qKe7ofum3s4vq7oFCPsOgwARAQABwsFl BBgBAgAPBQJVy5+RAhsMBQkJZgGAAAoJEE3eEPcA/4NagOsP/jPoIBb/iXVbM+fmSHOjEshl KMwEl/m5iLj3iHnHPVLBUWrXPdS7iQijJA/VLxjnFknhaS60hkUNWexDMxVVP/6lbOrs4bDZ NEWDMktAeqJaFtxackPszlcpRVkAs6Msn9tu8hlvB517pyUgvuD7ZS9gGOMmYwFQDyytpepo YApVV00P0u3AaE0Cj/o71STqGJKZxcVhPaZ+LR+UCBZOyKfEyq+ZN311VpOJZ1IvTExf+S/5 lqnciDtbO3I4Wq0ArLX1gs1q1XlXLaVaA3yVqeC8E7kOchDNinD3hJS4OX0e1gdsx/e6COvy qNg5aL5n0Kl4fcVqM0LdIhsubVs4eiNCa5XMSYpXmVi3HAuFyg9dN+x8thSwI836FoMASwOl C7tHsTjnSGufB+D7F7ZBT61BffNBBIm1KdMxcxqLUVXpBQHHlGkbwI+3Ye+nE6HmZH7IwLwV W+Ajl7oYF+jeKaH4DZFtgLYGLtZ1LDwKPjX7VAsa4Yx7S5+EBAaZGxK510MjIx6SGrZWBrrV TEvdV00F2MnQoeXKzD7O4WFbL55hhyGgfWTHwZ457iN9SgYi1JLPqWkZB0JRXIEtjd4JEQcx +8Umfre0Xt4713VxMygW0PnQt5aSQdMD58jHFxTk092mU+yIHj5LeYgvwSgZN4airXk5yRXl SE+xAvmumFBY Organization: Red Hat GmbH Message-ID: <4e46f750-bcd0-6efc-9b3f-bec0451504c9@redhat.com> Date: Mon, 19 Aug 2019 14:03:16 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.49]); Mon, 19 Aug 2019 12:03:18 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [qemu-s390x] linux-user: s390x issue on Fedora 30 (dynamic library loader?) X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 19.08.19 13:55, David Hildenbrand wrote: > On 19.08.19 12:32, Laurent Vivier wrote: >> Le 17/08/2019 =C3=A0 18:51, David Hildenbrand a =C3=A9crit=C2=A0: >>> On 17.08.19 18:22, Laurent Vivier wrote: >>>> Le 17/08/2019 =C3=A0 18:14, David Hildenbrand a =C3=A9crit=C2=A0: >>>>> On 17.08.19 17:59, David Hildenbrand wrote: >>>>>> Hi everybody, >>>>>> >>>>>> I was just trying to run qemu-s390x (linux-user) with a very simpl= e >>>>>> binary (gzip + lib/ld64.so.1, compiled under Fedora 27). This used= to >>>>>> work just fine a while ago (especially when I was working on vecto= r >>>>>> instructions using QEMU v3.1). However, now I can't get past a SEG= FAULT >>>>>> in the dynamic library loader (I assume it is trying to locate gli= bc). I >>>>>> tried a couple of other binaries that definitely used to work (fro= m >>>>>> Fedora 30). >>>>>> >>>>>> I checked QEMU v4.1, v4.0 and v3.1. All are broken for me. Which i= s >>>>>> weird - because it used to work :/ >>>>>> >>>>>> I remember that I was running Fedora 29 the last time I had it run= ning, >>>>>> so my gut feeling is that this is related to some other system lib= rary >>>>>> (but which?). I am running on an up-to-date Fedora 30 x86-64 now. >>>>>> >>>>>> Any ideas? Has this been reported already? (not sure if this is a = Fedora >>>>>> 30 issue) >>>>>> >>>>>> LANG=3DC ~/git/qemu/s390x-linux-user/qemu-s390x -d in_asm -L . gzi= p --help >>>>>> >>>>>> ---------------- >>>>>> IN: _dl_load_cache_lookup >>>>>> 0x00000040008854c2: larl %r1,0x4000895030 >>>>>> 0x00000040008854c8: lg %r8,264(%r11) >>>>>> 0x00000040008854ce: mvghi 0(%r1),-1 >>>>>> 0x00000040008854d4: la %r3,0(%r3,%r8) >>>>>> 0x00000040008854d8: l %r7,12(%r8) >>>>>> 0x00000040008854dc: llgfr %r2,%r7 >>>>>> 0x00000040008854e0: sllg %r1,%r2,1 >>>>>> 0x00000040008854e6: agr %r1,%r2 >>>>>> 0x00000040008854ea: sllg %r1,%r1,2 >>>>>> 0x00000040008854f0: la %r6,16(%r1,%r8) >>>>>> 0x00000040008854f4: sgr %r3,%r6 >>>>>> 0x00000040008854f8: stg %r3,256(%r11) >>>>>> 0x00000040008854fe: ahi %r7,-1 >>>>>> 0x0000004000885502: jl 0x40008850f0 >>>>>> >>>>>> ---------------- >>>>>> IN: _dl_load_cache_lookup >>>>>> 0x0000004000885506: srak %r10,%r7,1 >>>>>> 0x000000400088550c: lgfr %r2,%r10 >>>>>> 0x0000004000885510: sllg %r1,%r2,1 >>>>>> 0x0000004000885516: agr %r1,%r2 >>>>>> 0x000000400088551a: sllg %r1,%r1,2 >>>>>> 0x0000004000885520: l %r1,20(%r1,%r8) >>>>>> 0x0000004000885524: clrjhe %r1,%r3,0x40008850f0 >>>>>> >>>>>> Segmentation fault (Speicherabzug geschrieben) >>>>>> >>>>>> >>>>>> Core was generated by >>>>>> `/home/dhildenb/git/qemu/s390x-linux-user/qemu-s390x -d in_asm -L = . gzip >>>>>> --help'. >>>>>> Program terminated with signal SIGSEGV, Segmentation fault. >>>>>> #0 0x00007fdc5d7c3232 in sigsuspend () from /lib64/libc.so.6 >>>>>> [Current thread is 1 (Thread 0x7fdc5d7127c0 (LWP 31072))] >>>>>> Missing separate debuginfos, use: dnf debuginfo-install >>>>>> glib2-2.60.6-1.fc30.x86_64 glibc-2.29-15.fc30.x86_64 >>>>>> libgcc-9.1.1-1.fc30.x86_64 libstdc++-9.1.1-1.fc30.x86_64 >>>>>> pcre-8.43-2.fc30.x86_64 zlib-1.2.11-16.fc30.x86_64 >>>>>> (gdb) bt >>>>>> #0 0x00007fdc5d7c3232 in sigsuspend () from /lib64/libc.so.6 >>>>>> #1 0x000055f826135a9c in dump_core_and_abort >>>>>> (target_sig=3Dtarget_sig@entry=3D11) >>>>>> at /home/dhildenb/git/qemu/linux-user/signal.c:613 >>>>>> #2 0x000055f826135e37 in handle_pending_signal >>>>>> (cpu_env=3Dcpu_env@entry=3D0x55f8292cec48, sig=3Dsig@entry=3D11, >>>>>> k=3Dk@entry=3D0x55f8292d7df0) at >>>>>> /home/dhildenb/git/qemu/linux-user/signal.c:877 >>>>>> #3 0x000055f826136edd in process_pending_signals >>>>>> (cpu_env=3Dcpu_env@entry=3D0x55f8292cec48) >>>>>> at /home/dhildenb/git/qemu/linux-user/signal.c:953 >>>>>> #4 0x000055f82613a13a in cpu_loop (env=3D0x55f8292cec48) at >>>>>> /home/dhildenb/git/qemu/linux-user/s390x/cpu_loop.c:150 >>>>>> #5 0x000055f8260ce2ba in main (argc=3D, >>>>>> argv=3D0x7fff587a69d8, envp=3D) >>>>>> at /home/dhildenb/git/qemu/linux-user/main.c:819 >>>>>> >>>>>> Thanks! >>>>>> >>>>> >>>>> CCing QEMU-devel + use my proper dev mail address (I need more coff= ee :)) >>>>> >>>> >>>> I generally test qemu-s390x before my PR. Last time, I have tested w= ith >>>> Fedora 30 x86_64 but my target are always debian. >>> >>> What puzzles me is that it used to work just fine about 3-4 months ag= o. >>> I still have the binaries/libs lying around that I used back then (wh= en >>> debugging a vector instruction-related issue). Whatever binary/QEMU >>> version I try now, it keeps segfaulting. >>> >>> Via qemu-system-s390x, inside a Fedora guest, the binaries work >>> perfectly fine. So I really suspect that this has to do with my host = system. >>> >>>> >>>> So I guess the problem is with the target. >>>> >>>> I will have a look on Monday. >>> >> >> I'm not able to reproduce it. In a chroot or using "-L" with only >> /bin/gzip, /lib64/ld64.so.1 and /lib/libc.so.6 in the directory. >> >> My host is Fedora 30 (updated today) and the target directory is Fedor= a >> 30 too (from >> https://download-ib01.fedoraproject.org/pub/fedora-secondary/releases/= 30/Container/s390x/images/Fedora-Container-Minimal-Base-30-1.2.s390x.tar.= xz) >> >> Do you have more details? >=20 > Thanks for having a look! >=20 > I just tried with the Fedora 30 target files they seem to work just fin= e > indeed (chroot and -L after manually copying the two lib files). >=20 > Now, I took the same files from RHEL8 (everything is built with > z13/vector instruction support enforced under RHEL8). (I copied them > from a running guest using scp) - rhel-guest-image-8.0-1854.s390x.qcow2= . >=20 >=20 > Trying to run them results in the reported issue. >=20 > ~/git/qemu/s390x-linux-user/qemu-s390x -L . gzip > Segmentation fault (Speicherabzug geschrieben) >=20 > I can spot one main difference: >=20 > /lib64/libc-2.28.so: ELF 64-bit MSB shared object, IBM S/390, version 1 > (GNU/Linux), dynamically linked, interpreter /lib/ld64.so.1, > BuildID[sha1]=3Df2ed86061df0bad28270244424e58eb95f60c00c, for GNU/Linux > 3.2.0, not stripped, too many notes (256) >=20 > /lib64/ld-2.28.so: ELF 64-bit MSB shared object, IBM S/390, version 1 > (SYSV), dynamically linked, > BuildID[sha1]=3D6a58fd6ea86ec36455655ff718509ee4320cefc2, not stripped, > too many notes (256) >=20 > The libraries are not completely stripped. But even when stripping, I > get the same issue when trying to load them. >=20 > The binaries/libraries work perfectly fine within qemu-system-s390x. >=20 One more thing: Replacing /lib/ld64.so.1 from RHEL-8 by the one from Fedora 30 does the trick for me. The libc from RHEL-8 can be loaded and used sucessfully. --=20 Thanks, David / dhildenb