From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0DA63CA9EA0 for ; Tue, 22 Oct 2019 14:12:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D5ACD21783 for ; Tue, 22 Oct 2019 14:12:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="RTcbVbxJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730290AbfJVOMg (ORCPT ); Tue, 22 Oct 2019 10:12:36 -0400 Received: from mail-il1-f193.google.com ([209.85.166.193]:38527 "EHLO mail-il1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727582AbfJVOMg (ORCPT ); Tue, 22 Oct 2019 10:12:36 -0400 Received: by mail-il1-f193.google.com with SMTP id y5so15556084ilb.5 for ; Tue, 22 Oct 2019 07:12:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=O7dZCTWOrq2+UdA1TYOaK7RbJt7TwU/MLybnInxFeec=; b=RTcbVbxJo07kvI176WXetcHehyeSE9Z0zD1h5T2pM7COApXZ8sPHjhXpkySa8oYC3L ca3eDg20qAb750YoRlOd8mKDL5tdI4WUxyZEyRBqSnMhgOg2XZNzCb4pjaqFDstoys+H ROGf7jFRPKzETE+ft7aEWvoBzoLXWHkIetORUF1uOJs5P6RRrc7i6KBrAz1r/u9taSM2 5TWrBSezOAa5iSoSFnDCrbEwMqk9rwxZrou2NXSjGENkL2/xDB4SSHYJjmzIYed1Boyj lebDZb1d6v/Ye0UPtSsmSJrPB5+BeWURtFgCVgo2F1/y7+8MntM1vrhT7pK6Cq1IPBc5 KxzQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=O7dZCTWOrq2+UdA1TYOaK7RbJt7TwU/MLybnInxFeec=; b=l6MsNN9fCs3hdWoToJZqm+7sWkX1O1TBUx/CuMJoO7+Jo8VEwlvKXS63mUZOCWxmML nIGqp0vv1cjDl9KXkj3JZOnrflaE6STvNL32hDjS1rqyJZdSqPzgkZnGWsA+ZMSvHrLO Ad2vsYo6OwaUnjbFkez2gILY0lgyMBzR/T5N55RP9A//Ht4rFHdwq6ZjdU6p9C6pi7RJ /BBJONM5D8xCtBo2nVmLcOeG9JD5awSs/Rgmj/eY6NCbyAVJD/HVMMymIZnZMbbaGAKi in0OLqU63J/kq1yKVxTdXyvL+/eFxr+noqxrQFr1NMXvZltBPDHulGGxeZRnabyg8+iT QjxQ== X-Gm-Message-State: APjAAAWNueyAgxt4AA8ZGiu1jtrrvSqTbAjKaOUTygR69YU2ICLHDtsx 4cNWmgGKUOKf/2ztJrQ6q9M8Skah5feGTW3kTUPs2KVg X-Google-Smtp-Source: APXvYqzAKcEPkBLF/zxyI/wk96huL15+3RdAUc9uWPv9zaq2tLDTcwxXxmeCVxalQZrr3OLGvd2UgVq1EuS5AYEPj8w= X-Received: by 2002:a92:c608:: with SMTP id p8mr31332444ilm.10.1571753554485; Tue, 22 Oct 2019 07:12:34 -0700 (PDT) MIME-Version: 1.0 From: Prabhakar Kushwaha Date: Tue, 22 Oct 2019 19:42:23 +0530 Message-ID: Subject: Linux-5.4: bpf: test_core_reloc_arrays.o: Segmentation fault with llc -march=bpf To: linux-kselftest@vger.kernel.org, llvm-bugs@lists.llvm.org Content-Type: text/plain; charset="UTF-8" Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Adding llvm-bugs@lists.llvm.org mailing list... Hi All, I am trying to build kselftest on Linux-5.4 on ubuntu 18.04. I installed LLVM-9.0.0 and Clang-9.0.0 from below links after following steps from [1] because of discussion [2] https://releases.llvm.org/9.0.0/llvm-9.0.0.src.tar.xz https://releases.llvm.org/9.0.0/clang-tools-extra-9.0.0.src.tar.xz https://releases.llvm.org/9.0.0/cfe-9.0.0.src.tar.xz Now, i am trying with llc -march=bpf, with this segmentation fault is coming as below: gcc -g -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -DHAVE_GENHDR -I../../../include -Dbpf_prog_load=bpf_prog_test_load -Dbpf_load_program=bpf_test_load_program test_flow_dissector.c /usr/src/tovards/linux/tools/testing/selftests/bpf/test_stub.o /usr/src/tovards/linux/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/tovards/linux/tools/testing/selftests/bpf/test_flow_dissector gcc -g -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -DHAVE_GENHDR -I../../../include -Dbpf_prog_load=bpf_prog_test_load -Dbpf_load_program=bpf_test_load_program test_tcp_check_syncookie_user.c /usr/src/tovards/linux/tools/testing/selftests/bpf/test_stub.o /usr/src/tovards/linux/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/tovards/linux/tools/testing/selftests/bpf/test_tcp_check_syncookie_user gcc -g -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -DHAVE_GENHDR -I../../../include -Dbpf_prog_load=bpf_prog_test_load -Dbpf_load_program=bpf_test_load_program test_lirc_mode2_user.c /usr/src/tovards/linux/tools/testing/selftests/bpf/test_stub.o /usr/src/tovards/linux/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/tovards/linux/tools/testing/selftests/bpf/test_lirc_mode2_user (clang -I. -I./include/uapi -I../../../include/uapi -I/usr/src/tovards/linux/tools/testing/selftests/bpf/../usr/include -D__TARGET_ARCH_arm64 -g -idirafter /usr/local/include -idirafter /usr/local/lib/clang/9.0.0/include -idirafter /usr/include/aarch64-linux-gnu -idirafter /usr/include -Wno-compare-distinct-pointer-types -O2 -target bpf -emit-llvm \ -c progs/test_core_reloc_arrays.c -o - || echo "clang failed") | \ llc -march=bpf -mcpu=probe -filetype=obj -o /usr/src/tovards/linux/tools/testing/selftests/bpf/test_core_reloc_arrays.o Stack dump: 0. Program arguments: llc -march=bpf -mcpu=probe -filetype=obj -o /usr/src/tovards/linux/tools/testing/selftests/bpf/test_core_reloc_arrays.o 1. Running pass 'Function Pass Manager' on module ''. 2. Running pass 'BPF Assembly Printer' on function '@test_core_arrays' #0 0x0000aaaac618db08 llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/usr/local/bin/llc+0x152eb08) Segmentation fault Makefile:260: recipe for target '/usr/src/tovards/linux/tools/testing/selftests/bpf/test_core_reloc_arrays.o' failed make[1]: *** [/usr/src/tovards/linux/tools/testing/selftests/bpf/test_core_reloc_arrays.o] Error 139 To add more details, Commenting following lines in bpf/progs/test_core_reloc_arrays.c removes the segmentation fault. --- a/tools/testing/selftests/bpf/progs/test_core_reloc_arrays.c +++ b/tools/testing/selftests/bpf/progs/test_core_reloc_arrays.c @@ -41,15 +41,14 @@ int test_core_arrays(void *ctx) if (BPF_CORE_READ(&out->a2, &in->a[2])) return 1; /* in->b[1][2][3] */ - if (BPF_CORE_READ(&out->b123, &in->b[1][2][3])) - return 1; +// if (BPF_CORE_READ(&out->b123, &in->b[1][2][3])) +// return 1; /* in->c[1].c */ if (BPF_CORE_READ(&out->c1c, &in->c[1].c)) return 1; /* in->d[0][0].d */ - if (BPF_CORE_READ(&out->d00d, &in->d[0][0].d)) - return 1; - +// if (BPF_CORE_READ(&out->d00d, &in->d[0][0].d)) +// return 1; return 0; } It looks to be something related llc and more than 1 dimension array. has anyone faced such error. Please suggest!! --prabhakar(pk) [1] https://stackoverflow.com/questions/47255526/how-to-build-the-latest-clang-tidy [2] https://www.mail-archive.com/netdev@vger.kernel.org/msg315096.html Linux top-commit ---------------- commit bc88f85c6c09306bd21917e1ae28205e9cd775a7 (HEAD -> master, origin/master, origin/HEAD) Author: Ben Dooks Date: Wed Oct 16 12:24:58 2019 +0100 kthread: make __kthread_queue_delayed_work static The __kthread_queue_delayed_work is not exported so make it static, to avoid the following sparse warning: kernel/kthread.c:869:6: warning: symbol '__kthread_queue_delayed_work' was not declared. Should it be static? Signed-off-by: Ben Dooks Signed-off-by: Linus Torvalds