Jesper Dangaard Brouer
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e70136a68e
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ktrace-CO-RE: Adjust for newer libbpf API
‘bpf_program__next’ is deprecated: libbpf v0.7+:
use bpf_object__next_program() instead
See: https://github.com/libbpf/libbpf/issues/296
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2022-09-02 14:45:42 +02:00 |
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Jesper Dangaard Brouer
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bdbc2aa6ee
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ktrace-CO-RE/ktrace01_kern: kprobe changed name to .isra.0
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-09-10 13:45:42 +02:00 |
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Jesper Dangaard Brouer
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0542d8a7a3
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ktrace-CO-RE/ktrace01: Add --debug option to userspace loader
Use this --debug to better understand what libbpf does of
CO-RE relocation tricks and lookup of BTF-IDs.
Example output:
[...]
libbpf: loading kernel BTF '/sys/kernel/btf/vmlinux': 0
libbpf: map 'ktrace01.data': created successfully, fd=4
libbpf: sec 'kprobe/udp_send_skb': found 4 CO-RE relocations
libbpf: prog 'udp_send_skb': relo #0: kind <byte_off> (0), spec is [2] struct pt_regs.di (0:14 @ offset 112)
libbpf: CO-RE relocating [0] struct pt_regs: found target candidate [176] struct pt_regs in [vmlinux]
libbpf: prog 'udp_send_skb': relo #0: matching candidate #0 [176] struct pt_regs.di (0:14 @ offset 112)
libbpf: prog 'udp_send_skb': relo #0: patched insn #0 (LDX/ST/STX) off 112 -> 112
libbpf: prog 'udp_send_skb': relo #1: kind <byte_off> (0), spec is [7] struct sk_buff___local.hash (0:1 @ offset 4)
libbpf: CO-RE relocating [0] struct sk_buff___local: found target candidate [2965] struct sk_buff in [vmlinux]
[...]
Notice how the BTF-ID of 'struct sk_buff' is resolved to be 2965.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-24 17:55:58 +02:00 |
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Jesper Dangaard Brouer
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2390b4b110
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ktrace-CO-RE: Find running kernels BTF_ID for struct sk_buff
Using bpf_core_type_id_kernel to find kernels BTF_ID for SKB.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-24 14:34:31 +02:00 |
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Jesper Dangaard Brouer
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e0298638bd
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iktrace-CO-RE/ktrace01_kern.c: use attribute preserve_access_index
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-24 13:12:43 +02:00 |
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Jesper Dangaard Brouer
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7a05622440
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ktrace-CO-RE: ktrace01 userspace side cleanup program
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-24 11:40:43 +02:00 |
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Jesper Dangaard Brouer
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4dc38c35b9
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ktrace-CO-RE: ktrace01_kern.c print more info from SKB
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-24 09:02:19 +02:00 |
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Jesper Dangaard Brouer
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21d5dc3961
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ktrace-CO-RE: Cleanup ktrace01_kern.c
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-17 13:10:59 +02:00 |
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Jesper Dangaard Brouer
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599646aa64
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ktrace-CO-RE: Add bpf_printk statement in code
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-11 18:20:47 +02:00 |
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Jesper Dangaard Brouer
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566a14cb47
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ktrace-CO-RE: Doc how I used bpftrace as pre-investigate tool
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-11 18:19:46 +02:00 |
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Jesper Dangaard Brouer
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13339a9760
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ktrace-CO-RE: read /sys/kernel/debug/tracing/trace_pipe
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-11 18:18:36 +02:00 |
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Jesper Dangaard Brouer
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e26e1b970e
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ktrace-CO-RE: Cleanup
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-11 17:12:38 +02:00 |
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Jesper Dangaard Brouer
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54c0d52dd8
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ktrace-CO-RE: README explain CPU architecture challenges
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-02 10:39:12 +02:00 |
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Jesper Dangaard Brouer
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ff5fef3dc9
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headers/vmlinux: Add more archs powerpc and arm64
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-01 17:05:28 +02:00 |
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Jesper Dangaard Brouer
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8d44091df0
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ktrace-CO-RE: remove debug code to troubleshoot tracing include
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-01 16:25:42 +02:00 |
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Jesper Dangaard Brouer
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064bc31354
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headers/vmlinux: Add arch specific vmlinux.h defines
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-01 16:23:33 +02:00 |
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Jesper Dangaard Brouer
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f34f8d5787
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headers/vmlinux: Add header files to shadow vmlinux.h
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-01 16:23:08 +02:00 |
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Jesper Dangaard Brouer
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cae6fcfbe2
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ktrace: fight getting bpf/bpf_tracing.h working
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-06-01 14:44:58 +02:00 |
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Jesper Dangaard Brouer
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f11ff90d61
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ktrace-CO-RE: Add trivial BPF-prog
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-05-31 18:58:01 +02:00 |
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Jesper Dangaard Brouer
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d2c3b9d8bc
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ktrace-CO-RE: Add README
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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2021-05-26 22:21:45 +02:00 |
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