Re: samples don't build on v4.18

From: Jakub Kicinski
Date: Wed Aug 15 2018 - 15:34:27 EST

Next message: Mathieu Poirier: "Re: [PATCH 05/13] coresight: etm3: Add support for handling errors"
Previous message: Arnaldo Carvalho de Melo: "Re: [PATCH] perf: disable parallelism for 'make clean'"
In reply to: Joel Fernandes: "Re: samples don't build on v4.18"
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On Tue, 14 Aug 2018 20:01:32 -0700, Joel Fernandes wrote:
> On Tue, Aug 14, 2018 at 06:22:21PM -0700, Joel Fernandes wrote:
> > Forgot to add the patch author, doing so now. thanks
> >
> > On Tue, Aug 14, 2018 at 6:20 PM, Joel Fernandes <joelaf@xxxxxxxxxx> wrote:
> > >
> > > Hi,
> > > When building BPF samples on v4.18, I get the following errors:
> > >
> > > $ cd samples/bpf/
> > > $ make
> > >
> > > Auto-detecting system features:
> > > ... libelf: [ OFF ]
> > > ... bpf: [ OFF ]
> > >
> > > No libelf found
> > > Makefile:213: recipe for target 'elfdep' failed
> > > -----------
> > >
> > > I bissected it down to commit 5f9380572b4bb24f60cd492b1
> > >
> > > Author: Jakub Kicinski <jakub.kicinski@xxxxxxxxxxxxx>
> > > Date: Thu May 10 10:24:39 2018 -0700
> > >
> > > samples: bpf: compile and link against full libbpf
> > > ---------
> > >
> > > Checking out a kernel before this commit makes the samples build. Also I do
> > > have libelf on my system.
> > >
> > > Any thoughts on this issue?
>
> There is some weirdness going on with my kernel tree. If I do a fresh clone
> of v4.18 and build samples, everything works.
>
> However if I take my existing checkout, do a:
> git clean -f -d
> make mrproper
>
> Then I try to build the samples, I get the "No libelf found".
>
> Obviously the existing checked out kernel tree is in some weird state that I
> am not yet able to fix. But atleast if I blow the whole tree and clone again,
> I'm able to build...
>
> Is this related to the intermittent "No libelf found" issues that were
> recently discussed?

Can't reproduce, could you provide all exact commands you run to see
this, including the initial clone?

12:32 linux$ git clean -f -d
12:32 linux$ make mrproper
CLEAN .
CLEAN arch/x86/tools
CLEAN .tmp_versions
CLEAN scripts/basic
CLEAN scripts/kconfig
CLEAN scripts/mod
CLEAN scripts
CLEAN include/config usr/include include/generated arch/x86/include/generated
CLEAN .config .config.old
12:32 linux$ make defconfig
HOSTCC scripts/basic/fixdep
HOSTCC scripts/kconfig/conf.o
YACC scripts/kconfig/zconf.tab.c
LEX scripts/kconfig/zconf.lex.c
HOSTCC scripts/kconfig/zconf.tab.o
HOSTLD scripts/kconfig/conf
*** Default configuration is based on 'x86_64_defconfig'
#
# configuration written to .config
#
12:32 linux$ make headers_install
UPD include/generated/uapi/linux/version.h
WRAP arch/x86/include/generated/uapi/asm/bpf_perf_event.h
WRAP arch/x86/include/generated/uapi/asm/poll.h
SYSTBL arch/x86/include/generated/asm/syscalls_32.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_32.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_64.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_x32.h
HOSTCC arch/x86/tools/relocs_32.o
HOSTCC arch/x86/tools/relocs_64.o
HOSTCC arch/x86/tools/relocs_common.o
HOSTLD arch/x86/tools/relocs
HOSTCC scripts/unifdef
INSTALL usr/include/asm-generic/ (37 files)
INSTALL usr/include/drm/ (26 files)
INSTALL usr/include/linux/ (497 files)
INSTALL usr/include/linux/android/ (1 file)
INSTALL usr/include/linux/byteorder/ (2 files)
INSTALL usr/include/linux/caif/ (2 files)
INSTALL usr/include/linux/can/ (6 files)
INSTALL usr/include/linux/cifs/ (1 file)
INSTALL usr/include/linux/dvb/ (8 files)
INSTALL usr/include/linux/genwqe/ (1 file)
INSTALL usr/include/linux/hdlc/ (1 file)
INSTALL usr/include/linux/hsi/ (2 files)
INSTALL usr/include/linux/iio/ (2 files)
INSTALL usr/include/linux/isdn/ (1 file)
INSTALL usr/include/linux/mmc/ (1 file)
INSTALL usr/include/linux/netfilter/ (88 files)
INSTALL usr/include/linux/netfilter/ipset/ (4 files)
INSTALL usr/include/linux/netfilter_arp/ (2 files)
INSTALL usr/include/linux/netfilter_bridge/ (17 files)
INSTALL usr/include/linux/netfilter_ipv4/ (9 files)
INSTALL usr/include/linux/netfilter_ipv6/ (13 files)
INSTALL usr/include/linux/nfsd/ (5 files)
INSTALL usr/include/linux/raid/ (2 files)
INSTALL usr/include/linux/sched/ (1 file)
INSTALL usr/include/linux/spi/ (1 file)
INSTALL usr/include/linux/sunrpc/ (1 file)
INSTALL usr/include/linux/tc_act/ (15 files)
INSTALL usr/include/linux/tc_ematch/ (5 files)
INSTALL usr/include/linux/usb/ (12 files)
INSTALL usr/include/linux/wimax/ (1 file)
INSTALL usr/include/misc/ (2 files)
INSTALL usr/include/mtd/ (5 files)
INSTALL usr/include/rdma/ (25 files)
INSTALL usr/include/rdma/hfi/ (2 files)
INSTALL usr/include/scsi/ (4 files)
INSTALL usr/include/scsi/fc/ (4 files)
INSTALL usr/include/sound/ (16 files)
INSTALL usr/include/video/ (3 files)
INSTALL usr/include/xen/ (4 files)
INSTALL usr/include/asm/ (62 files)
12:32 linux$ cd samples/bpf/
12:32 bpf$ make LLC=llc-6.0 LLVM_OBJCOPY=llvm-objcopy-6.0 CLANG=clang-6.0
make -C ../../ /tmp/linux/samples/bpf/ BPF_SAMPLES_PATH=/tmp/linux/samples/bpf
make[1]: Entering directory '/tmp/linux'
scripts/kconfig/conf --syncconfig Kconfig
SYSHDR arch/x86/include/generated/asm/unistd_32_ia32.h
SYSHDR arch/x86/include/generated/asm/unistd_64_x32.h
SYSTBL arch/x86/include/generated/asm/syscalls_64.h
UPD include/config/kernel.release
WRAP arch/x86/include/generated/asm/dma-contiguous.h
WRAP arch/x86/include/generated/asm/early_ioremap.h
WRAP arch/x86/include/generated/asm/mcs_spinlock.h
WRAP arch/x86/include/generated/asm/mm-arch-hooks.h
UPD include/generated/utsrelease.h
CC kernel/bounds.s
UPD include/generated/bounds.h
UPD include/generated/timeconst.h
CC arch/x86/kernel/asm-offsets.s
UPD include/generated/asm-offsets.h
CALL scripts/checksyscalls.sh
DESCEND objtool
HOSTCC /tmp/linux/tools/objtool/fixdep.o
HOSTLD /tmp/linux/tools/objtool/fixdep-in.o
LINK /tmp/linux/tools/objtool/fixdep
CC /tmp/linux/tools/objtool/exec-cmd.o
CC /tmp/linux/tools/objtool/help.o
CC /tmp/linux/tools/objtool/pager.o
CC /tmp/linux/tools/objtool/parse-options.o
CC /tmp/linux/tools/objtool/run-command.o
CC /tmp/linux/tools/objtool/sigchain.o
CC /tmp/linux/tools/objtool/subcmd-config.o
LD /tmp/linux/tools/objtool/libsubcmd-in.o
AR /tmp/linux/tools/objtool/libsubcmd.a
CC /tmp/linux/tools/objtool/arch/x86/decode.o
LD /tmp/linux/tools/objtool/arch/x86/objtool-in.o
CC /tmp/linux/tools/objtool/builtin-check.o
CC /tmp/linux/tools/objtool/builtin-orc.o
CC /tmp/linux/tools/objtool/check.o
CC /tmp/linux/tools/objtool/orc_gen.o
CC /tmp/linux/tools/objtool/orc_dump.o
CC /tmp/linux/tools/objtool/elf.o
CC /tmp/linux/tools/objtool/special.o
CC /tmp/linux/tools/objtool/objtool.o
CC /tmp/linux/tools/objtool/libstring.o
CC /tmp/linux/tools/objtool/str_error_r.o
LD /tmp/linux/tools/objtool/objtool-in.o
LINK /tmp/linux/tools/objtool/objtool
CC scripts/mod/empty.o
HOSTCC scripts/mod/mk_elfconfig
MKELF scripts/mod/elfconfig.h
HOSTCC scripts/mod/modpost.o
CC scripts/mod/devicetable-offsets.s
UPD scripts/mod/devicetable-offsets.h
HOSTCC scripts/mod/file2alias.o
HOSTCC scripts/mod/sumversion.o
HOSTLD scripts/mod/modpost
HOSTCC scripts/selinux/genheaders/genheaders
HOSTCC scripts/selinux/mdp/mdp
HOSTCC scripts/kallsyms
HOSTCC scripts/pnmtologo
HOSTCC scripts/conmakehash
HOSTCC scripts/sortextable
HOSTCC scripts/asn1_compiler
HOSTCC scripts/extract-cert
make -C /tmp/linux/samples/bpf/../../tools/lib/bpf/ RM='rm -rf' LDFLAGS= srctree=/tmp/linux/samples/bpf/../../ O=
HOSTCC fixdep.o
HOSTLD fixdep-in.o
LINK fixdep
CC libbpf.o
CC bpf.o
CC nlattr.o
CC btf.o
LD libbpf-in.o
LINK libbpf.a
LINK libbpf.so
HOSTCC /tmp/linux/samples/bpf/test_lru_dist
HOSTCC /tmp/linux/samples/bpf/sock_example
HOSTCC /tmp/linux/samples/bpf/bpf_load.o
HOSTCC /tmp/linux/samples/bpf/fds_example.o
HOSTLD /tmp/linux/samples/bpf/fds_example
HOSTCC /tmp/linux/samples/bpf/sockex1_user.o
HOSTLD /tmp/linux/samples/bpf/sockex1
HOSTCC /tmp/linux/samples/bpf/sockex2_user.o
HOSTLD /tmp/linux/samples/bpf/sockex2
HOSTCC /tmp/linux/samples/bpf/sockex3_user.o
HOSTLD /tmp/linux/samples/bpf/sockex3
HOSTCC /tmp/linux/samples/bpf/tracex1_user.o
HOSTLD /tmp/linux/samples/bpf/tracex1
HOSTCC /tmp/linux/samples/bpf/tracex2_user.o
HOSTLD /tmp/linux/samples/bpf/tracex2
HOSTCC /tmp/linux/samples/bpf/tracex3_user.o
HOSTLD /tmp/linux/samples/bpf/tracex3
HOSTCC /tmp/linux/samples/bpf/tracex4_user.o
HOSTLD /tmp/linux/samples/bpf/tracex4
HOSTCC /tmp/linux/samples/bpf/tracex5_user.o
HOSTLD /tmp/linux/samples/bpf/tracex5
HOSTCC /tmp/linux/samples/bpf/tracex6_user.o
HOSTLD /tmp/linux/samples/bpf/tracex6
HOSTCC /tmp/linux/samples/bpf/tracex7_user.o
HOSTLD /tmp/linux/samples/bpf/tracex7
HOSTCC /tmp/linux/samples/bpf/test_probe_write_user_user.o
HOSTLD /tmp/linux/samples/bpf/test_probe_write_user
HOSTCC /tmp/linux/samples/bpf/trace_output_user.o
HOSTCC /tmp/linux/samples/bpf/../../tools/testing/selftests/bpf/trace_helpers.o
HOSTLD /tmp/linux/samples/bpf/trace_output
HOSTCC /tmp/linux/samples/bpf/lathist_user.o
HOSTLD /tmp/linux/samples/bpf/lathist
HOSTCC /tmp/linux/samples/bpf/offwaketime_user.o
HOSTLD /tmp/linux/samples/bpf/offwaketime
HOSTCC /tmp/linux/samples/bpf/spintest_user.o
HOSTLD /tmp/linux/samples/bpf/spintest
HOSTCC /tmp/linux/samples/bpf/map_perf_test_user.o
HOSTLD /tmp/linux/samples/bpf/map_perf_test
HOSTCC /tmp/linux/samples/bpf/test_overhead_user.o
HOSTLD /tmp/linux/samples/bpf/test_overhead
HOSTCC /tmp/linux/samples/bpf/test_cgrp2_array_pin.o
HOSTLD /tmp/linux/samples/bpf/test_cgrp2_array_pin
HOSTCC /tmp/linux/samples/bpf/test_cgrp2_attach.o
HOSTLD /tmp/linux/samples/bpf/test_cgrp2_attach
HOSTCC /tmp/linux/samples/bpf/test_cgrp2_attach2.o
HOSTCC /tmp/linux/samples/bpf/../../tools/testing/selftests/bpf/cgroup_helpers.o
HOSTLD /tmp/linux/samples/bpf/test_cgrp2_attach2
HOSTCC /tmp/linux/samples/bpf/test_cgrp2_sock.o
HOSTLD /tmp/linux/samples/bpf/test_cgrp2_sock
HOSTCC /tmp/linux/samples/bpf/test_cgrp2_sock2.o
HOSTLD /tmp/linux/samples/bpf/test_cgrp2_sock2
HOSTCC /tmp/linux/samples/bpf/xdp1_user.o
HOSTLD /tmp/linux/samples/bpf/xdp1
HOSTLD /tmp/linux/samples/bpf/xdp2
HOSTCC /tmp/linux/samples/bpf/xdp_router_ipv4_user.o
HOSTLD /tmp/linux/samples/bpf/xdp_router_ipv4
HOSTCC /tmp/linux/samples/bpf/test_current_task_under_cgroup_user.o
HOSTLD /tmp/linux/samples/bpf/test_current_task_under_cgroup
HOSTCC /tmp/linux/samples/bpf/trace_event_user.o
HOSTLD /tmp/linux/samples/bpf/trace_event
HOSTCC /tmp/linux/samples/bpf/sampleip_user.o
HOSTLD /tmp/linux/samples/bpf/sampleip
HOSTCC /tmp/linux/samples/bpf/tc_l2_redirect_user.o
HOSTLD /tmp/linux/samples/bpf/tc_l2_redirect
HOSTCC /tmp/linux/samples/bpf/lwt_len_hist_user.o
HOSTLD /tmp/linux/samples/bpf/lwt_len_hist
HOSTCC /tmp/linux/samples/bpf/xdp_tx_iptunnel_user.o
HOSTLD /tmp/linux/samples/bpf/xdp_tx_iptunnel
HOSTCC /tmp/linux/samples/bpf/test_map_in_map_user.o
HOSTLD /tmp/linux/samples/bpf/test_map_in_map
HOSTCC /tmp/linux/samples/bpf/cookie_uid_helper_example.o
HOSTLD /tmp/linux/samples/bpf/per_socket_stats_example
HOSTCC /tmp/linux/samples/bpf/load_sock_ops.o
HOSTLD /tmp/linux/samples/bpf/load_sock_ops
HOSTCC /tmp/linux/samples/bpf/xdp_redirect_user.o
HOSTLD /tmp/linux/samples/bpf/xdp_redirect
HOSTCC /tmp/linux/samples/bpf/xdp_redirect_map_user.o
HOSTLD /tmp/linux/samples/bpf/xdp_redirect_map
HOSTCC /tmp/linux/samples/bpf/xdp_redirect_cpu_user.o
HOSTLD /tmp/linux/samples/bpf/xdp_redirect_cpu
HOSTCC /tmp/linux/samples/bpf/xdp_monitor_user.o
HOSTLD /tmp/linux/samples/bpf/xdp_monitor
HOSTCC /tmp/linux/samples/bpf/xdp_rxq_info_user.o
HOSTLD /tmp/linux/samples/bpf/xdp_rxq_info
HOSTCC /tmp/linux/samples/bpf/syscall_tp_user.o
HOSTLD /tmp/linux/samples/bpf/syscall_tp
HOSTCC /tmp/linux/samples/bpf/cpustat_user.o
HOSTLD /tmp/linux/samples/bpf/cpustat
HOSTCC /tmp/linux/samples/bpf/xdp_adjust_tail_user.o
HOSTLD /tmp/linux/samples/bpf/xdp_adjust_tail
HOSTCC /tmp/linux/samples/bpf/xdpsock_user.o
HOSTLD /tmp/linux/samples/bpf/xdpsock
HOSTCC /tmp/linux/samples/bpf/xdp_fwd_user.o
HOSTLD /tmp/linux/samples/bpf/xdp_fwd
HOSTCC /tmp/linux/samples/bpf/task_fd_query_user.o
HOSTLD /tmp/linux/samples/bpf/task_fd_query
CC /tmp/linux/samples/bpf/syscall_nrs.s
CLANG-bpf /tmp/linux/samples/bpf/sockex1_kern.o
CLANG-bpf /tmp/linux/samples/bpf/sockex2_kern.o
CLANG-bpf /tmp/linux/samples/bpf/sockex3_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tracex1_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tracex2_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tracex3_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tracex4_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tracex5_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tracex6_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tracex7_kern.o
CLANG-bpf /tmp/linux/samples/bpf/sock_flags_kern.o
CLANG-bpf /tmp/linux/samples/bpf/test_probe_write_user_kern.o
CLANG-bpf /tmp/linux/samples/bpf/trace_output_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tcbpf1_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tc_l2_redirect_kern.o
CLANG-bpf /tmp/linux/samples/bpf/lathist_kern.o
CLANG-bpf /tmp/linux/samples/bpf/offwaketime_kern.o
CLANG-bpf /tmp/linux/samples/bpf/spintest_kern.o
CLANG-bpf /tmp/linux/samples/bpf/map_perf_test_kern.o
CLANG-bpf /tmp/linux/samples/bpf/test_overhead_tp_kern.o
CLANG-bpf /tmp/linux/samples/bpf/test_overhead_raw_tp_kern.o
CLANG-bpf /tmp/linux/samples/bpf/test_overhead_kprobe_kern.o
CLANG-bpf /tmp/linux/samples/bpf/parse_varlen.o
CLANG-bpf /tmp/linux/samples/bpf/parse_simple.o
CLANG-bpf /tmp/linux/samples/bpf/parse_ldabs.o
CLANG-bpf /tmp/linux/samples/bpf/test_cgrp2_tc_kern.o
CLANG-bpf /tmp/linux/samples/bpf/xdp1_kern.o
CLANG-bpf /tmp/linux/samples/bpf/xdp2_kern.o
CLANG-bpf /tmp/linux/samples/bpf/xdp_router_ipv4_kern.o
CLANG-bpf /tmp/linux/samples/bpf/test_current_task_under_cgroup_kern.o
CLANG-bpf /tmp/linux/samples/bpf/trace_event_kern.o
CLANG-bpf /tmp/linux/samples/bpf/sampleip_kern.o
CLANG-bpf /tmp/linux/samples/bpf/lwt_len_hist_kern.o
CLANG-bpf /tmp/linux/samples/bpf/xdp_tx_iptunnel_kern.o
CLANG-bpf /tmp/linux/samples/bpf/test_map_in_map_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tcp_synrto_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tcp_rwnd_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tcp_bufs_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tcp_cong_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tcp_iw_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tcp_clamp_kern.o
CLANG-bpf /tmp/linux/samples/bpf/tcp_basertt_kern.o
CLANG-bpf /tmp/linux/samples/bpf/xdp_redirect_kern.o
CLANG-bpf /tmp/linux/samples/bpf/xdp_redirect_map_kern.o
CLANG-bpf /tmp/linux/samples/bpf/xdp_redirect_cpu_kern.o
CLANG-bpf /tmp/linux/samples/bpf/xdp_monitor_kern.o
CLANG-bpf /tmp/linux/samples/bpf/xdp_rxq_info_kern.o
CLANG-bpf /tmp/linux/samples/bpf/xdp2skb_meta_kern.o
CLANG-bpf /tmp/linux/samples/bpf/syscall_tp_kern.o
CLANG-bpf /tmp/linux/samples/bpf/cpustat_kern.o
CLANG-bpf /tmp/linux/samples/bpf/xdp_adjust_tail_kern.o
CLANG-bpf /tmp/linux/samples/bpf/xdpsock_kern.o
CLANG-bpf /tmp/linux/samples/bpf/xdp_fwd_kern.o
CLANG-bpf /tmp/linux/samples/bpf/task_fd_query_kern.o
make[1]: Leaving directory '/tmp/linux'

Next message: Mathieu Poirier: "Re: [PATCH 05/13] coresight: etm3: Add support for handling errors"
Previous message: Arnaldo Carvalho de Melo: "Re: [PATCH] perf: disable parallelism for 'make clean'"
In reply to: Joel Fernandes: "Re: samples don't build on v4.18"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]