On Fri, Jan 27, 2023, at 5:21 PM, Daniel Xu wrote: > Hi Jiri & Alexandre, > > On Fri, Jan 27, 2023, at 5:00 PM, Jiri Olsa wrote: >> On Fri, Jan 27, 2023 at 04:28:54PM -0600, Alexandre Peixoto Ferreira wrote: >>> >>> >>> On 1/24/23 00:13, Daniel Xu wrote: >>> > Hi Jiri, >>> > >>> > On Mon, Jan 23, 2023, at 1:06 AM, Jiri Olsa wrote: >>> > > On Sun, Jan 22, 2023 at 10:48:44AM -0700, Daniel Xu wrote: >>> > > > Hi, >>> > > > >>> > > > I'm getting the following error during build: >>> > > > >>> > > > $ ./tools/testing/selftests/bpf/vmtest.sh -j30 >>> > > > [...] >>> > > > BTF .btf.vmlinux.bin.o >>> > > > btf_encoder__encode: btf__dedup failed! >>> > > > Failed to encode BTF >>> > > > LD .tmp_vmlinux.kallsyms1 >>> > > > NM .tmp_vmlinux.kallsyms1.syms >>> > > > KSYMS .tmp_vmlinux.kallsyms1.S >>> > > > AS .tmp_vmlinux.kallsyms1.S >>> > > > LD .tmp_vmlinux.kallsyms2 >>> > > > NM .tmp_vmlinux.kallsyms2.syms >>> > > > KSYMS .tmp_vmlinux.kallsyms2.S >>> > > > AS .tmp_vmlinux.kallsyms2.S >>> > > > LD .tmp_vmlinux.kallsyms3 >>> > > > NM .tmp_vmlinux.kallsyms3.syms >>> > > > KSYMS .tmp_vmlinux.kallsyms3.S >>> > > > AS .tmp_vmlinux.kallsyms3.S >>> > > > LD vmlinux >>> > > > BTFIDS vmlinux >>> > > > FAILED: load BTF from vmlinux: No such file or directory >>> > > > make[1]: *** [scripts/Makefile.vmlinux:35: vmlinux] Error 255 >>> > > > make[1]: *** Deleting file 'vmlinux' >>> > > > make: *** [Makefile:1264: vmlinux] Error 2 >>> > > > >>> > > > This happens on both bpf-next/master (84150795a49) and 6.2-rc5 >>> > > > (2241ab53cb). >>> > > > >>> > > > I've also tried arch linux pahole 1:1.24+r29+g02d67c5-1 as well as >>> > > > upstream pahole on master (02d67c5176) and upstream pahole on >>> > > > next (2ca56f4c6f659). >>> > > > >>> > > > Of the above 6 combinations, I think I've tried all of them (maybe >>> > > > missing 1 or 2). >>> > > > >>> > > > Looks like GCC got updated recently on my machine, so perhaps >>> > > > it's related? >>> > > > >>> > > > CONFIG_CC_VERSION_TEXT="gcc (GCC) 12.2.1 20230111" >>> > > > >>> > > > I'll try some debugging, but just wanted to report it first. >>> > > hi, >>> > > I can't reproduce that.. can you reproduce it outside vmtest.sh? >>> > > >>> > > there will be lot of output with patch below, but could contain >>> > > some more error output >>> > Thanks for the hints. Doing a regular build outside of vmtest.sh >>> > seems to work ok. So maybe it's a difference in the build config. >>> > >>> > I'll put a little more time into debugging to see if it goes anywhere. >>> > But I'll have to get back to the regularly scheduled programming >>> > soon. >>> 6.2-rc5 compiles correctly when CONFIG_X86_KERNEL_IBT is commented but fails >>> in pahole when CONFIG_X86_KERNEL_IBT is set. >> >> could you plese attach your config and the build error? >> I can't reproduce that > > I've confirmed that CONFIG_X86_KERNEL_IBT=n fixes my issue as well. > > Here is the config that produces my originally reported error: > https://pastes.dxuuu.xyz/wlg9tb > > Thanks, > Daniel Here's a patch that helps for me. Not sure if you want to apply this or fix the root cause in bpftool. --- >From 3dc50f3dd45767cb8c3b32c1510c7064f20f80c1 Mon Sep 17 00:00:00 2001 Message-Id: <3dc50f3dd45767cb8c3b32c1510c7064f20f80c1.1674865319.git.dxu@xxxxxxxxx> From: Daniel Xu <dxu@xxxxxxxxx> Date: Fri, 27 Jan 2023 17:17:32 -0700 Subject: [PATCH] bpf, selftests: Disable CONFIG_X86_KERNEL_IBT for vmtest.sh CONFIG_X86_KERNEL_IBT=y was causing the following compile error: BTF .btf.vmlinux.bin.o btf_encoder__encode: btf__dedup failed! Failed to encode BTF LD .tmp_vmlinux.kallsyms1 NM .tmp_vmlinux.kallsyms1.syms KSYMS .tmp_vmlinux.kallsyms1.S AS .tmp_vmlinux.kallsyms1.S LD .tmp_vmlinux.kallsyms2 NM .tmp_vmlinux.kallsyms2.syms KSYMS .tmp_vmlinux.kallsyms2.S AS .tmp_vmlinux.kallsyms2.S LD .tmp_vmlinux.kallsyms3 NM .tmp_vmlinux.kallsyms3.syms KSYMS .tmp_vmlinux.kallsyms3.S AS .tmp_vmlinux.kallsyms3.S LD vmlinux BTFIDS vmlinux libbpf: failed to find '.BTF' ELF section in vmlinux FAILED: load BTF from vmlinux: No data available make[1]: *** [scripts/Makefile.vmlinux:34: vmlinux] Error 255 make[1]: *** Deleting file 'vmlinux' make: *** [Makefile:1252: vmlinux] Error 2 Disable for vmtests as we do not really need the extra security measures there. I suspect this was recently triggered by 4fd5f70ce14d ("x86/Kconfig: Enable kernel IBT by default"). Signed-off-by: Daniel Xu <dxu@xxxxxxxxx> --- tools/testing/selftests/bpf/config.x86_64 | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/testing/selftests/bpf/config.x86_64 b/tools/testing/selftests/bpf/config.x86_64 index dd97d61d325c..3026b1282cc7 100644 --- a/tools/testing/selftests/bpf/config.x86_64 +++ b/tools/testing/selftests/bpf/config.x86_64 @@ -237,6 +237,7 @@ CONFIG_VIRTIO_PCI=y CONFIG_VLAN_8021Q=y CONFIG_X86_ACPI_CPUFREQ=y CONFIG_X86_CPUID=y +CONFIG_X86_KERNEL_IBT=n CONFIG_X86_MSR=y CONFIG_X86_POWERNOW_K8=y CONFIG_XDP_SOCKETS_DIAG=y -- 2.39.1
