[lttng-dev] LTTng-ust 2.4.0-rc2: no events when tracing busybox
Mathieu Desnoyers
mathieu.desnoyers at efficios.com
Tue Mar 11 15:10:02 EDT 2014
----- Original Message -----
> From: "Santiago Font" <sfont at teldat.com>
> To: lttng-dev at lists.lttng.org
> Sent: Tuesday, March 11, 2014 2:28:11 PM
> Subject: [lttng-dev] LTTng-ust 2.4.0-rc2: no events when tracing busybox
>
> Hi,
>
> I have an embedded scenario (openwrt over Freescale) working with
> LTTng:
>
> lttng create TEST
> lttng enable-channel MYCHAN -u --buffers-uid --subbuf-size 64k
> lttng add-context -u -t procname -c MYCHAN
> lttng enable-event -u "*" -c MYCHAN
> lttng start
> /usr/sbin/sample &
> lttng stop
> lttng view
>
> - Several ust_baddr_statedump:soinfo events
> - An example of the events I defined
> (See below for details: dump_1)
>
> So far, so good.
>
> Now, I'm trying to add my events to busybox to trace telnetd (very
> same provider .c file and event definition .h file, changing only the
> provider name).
> When I follow exactly the same steps but changing "/usr/sbin/sample
> &" for "/usr/sbin/telnetd -F &", I get the ust_baddr_statedump:soinfo
> events, but none of my events (see dump_2)
> I have tried with/without TRACEPOINT_PROBE_DYNAMIC_LINKAGE,
> with/without LD_PRELOAD=liblttng-ust-fork.so, but not success.
> Taking a look to the symbols inside the binary (dump 3), all LTTng
> stuff seems to be there.
>
> LTTng (modules, tools, ust): 2.4.0
>
> Any idea?
Could you share with us your patch that adds your specific tracepoints
into the busybox codebase, along with the specific links/version info
needed for us to see how it integrate into the busybox build system ?
Thanks,
Mathieu
> Thank you,
>
> Santi
>
>
>
> ------- dump_1 ------------------
>
> [00:05:04.281094007] (+10.405305121) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "sample" }, { baddr = 0x10000000, sopath =
> "/usr/sbin/sample", size = 9176, mtime = 1394554355 }
> [00:05:04.281173138] (+0.000079131) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "sample" }, { baddr = 0x48018000, sopath =
> "/lib/libdl-0.9.33.2.so", size = 12436, mtime = 1394229945 }
> [00:05:04.281214310] (+0.000041172) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "sample" }, { baddr = 0x4802C000, sopath =
> "/usr/lib/liblttng-ust.so.0.0.0", size = 224696, mtime = 1394554355 }
> [00:05:04.281239239] (+0.000024929) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "sample" }, { baddr = 0x48074000, sopath =
> "/lib/libgcc_s.so.1", size = 88200, mtime = 1394229944 }
> [00:05:04.281271259] (+0.000032020) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "sample" }, { baddr = 0x4809A000, sopath =
> "/lib/libuClibc-0.9.33.2.so", size = 326616, mtime = 1394229945 }
> [00:05:04.281303562] (+0.000032303) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "sample" }, { baddr = 0x48000000, sopath =
> "/lib/ld-uClibc-0.9.33.2.so", size = 29052, mtime = 1394229945 }
> [00:05:04.281344714] (+0.000041152) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "sample" }, { baddr = 0x480FF000, sopath =
> "/usr/lib/liblttng-ust-tracepoint.so.0.0.0", size = 25276, mtime =
> 1394554355 }
> [00:05:04.281376996] (+0.000032282) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "sample" }, { baddr = 0x4811E000, sopath =
> "/lib/librt-0.9.33.2.so", size = 12404, mtime = 1394229945 }
> [00:05:04.281416532] (+0.000039536) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "sample" }, { baddr = 0x48132000, sopath =
> "/usr/lib/liburcu-bp.so.1.0.0", size = 15388, mtime = 1394548454 }
> [00:05:04.281456411] (+0.000039879) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "sample" }, { baddr = 0x48146000, sopath =
> "/usr/lib/liburcu-cds.so.1.0.0", size = 18216, mtime = 1394548454 }
> [00:05:04.281489138] (+0.000032727) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "sample" }, { baddr = 0x4815B000, sopath =
> "/lib/libpthread-0.9.33.2.so", size = 70104, mtime = 1394229945 }
> [00:05:04.281529501] (+0.000040363) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "sample" }, { baddr = 0x4817F000, sopath =
> "/usr/lib/liburcu-common.so.1.0.0", size = 3188, mtime = 1394548454 }
> [00:05:04.282903966] (+0.001374465) OpenWrt busybox_telnetd2:info: {
> cpu_id = 0 }, { procname = "sample" }, { msg = "Hello World" }
> [00:05:04.282922512] (+0.000018546) OpenWrt busybox_telnetd2:session: {
> cpu_id = 0 }, { procname = "sample" }, { msg = "Session", client =
> "10.0.2.5", server = "10.0.2.4", session_pid = 0 }
> [00:05:04.282929643] (+0.000007131) OpenWrt busybox_telnetd2:err: {
> cpu_id = 0 }, { procname = "sample" }, { call = "arg1", msg = "arg2",
> errno_val = 0 }
>
> ------- dump_2 ------------------
> [00:14:16.375740554] (+11.778441605) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "telnetd" }, { baddr = 0x10000000, sopath =
> "/bin/busybox", size = 438834, mtime = 1394559555 }
> [00:14:16.375818817] (+0.000078263) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "telnetd" }, { baddr = 0x48018000, sopath =
> "/lib/libcrypt-0.9.33.2.so", size = 20724, mtime = 1394229945 }
> [00:14:16.375852150] (+0.000033333) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "telnetd" }, { baddr = 0x4803F000, sopath =
> "/lib/libdl-0.9.33.2.so", size = 12436, mtime = 1394229945 }
> [00:14:16.375892474] (+0.000040324) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "telnetd" }, { baddr = 0x48053000, sopath =
> "/usr/lib/liblttng-ust.so.0.0.0", size = 224696, mtime = 1394554355 }
> [00:14:16.375941827] (+0.000049353) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "telnetd" }, { baddr = 0x4809B000, sopath =
> "/lib/libm-0.9.33.2.so", size = 61540, mtime = 1394229945 }
> [00:14:16.375967524] (+0.000025697) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "telnetd" }, { baddr = 0x480BB000, sopath =
> "/lib/libgcc_s.so.1", size = 88200, mtime = 1394229944 }
> [00:14:16.375999484] (+0.000031960) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "telnetd" }, { baddr = 0x480E1000, sopath =
> "/lib/libuClibc-0.9.33.2.so", size = 326616, mtime = 1394229945 }
> [00:14:16.376031585] (+0.000032101) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "telnetd" }, { baddr = 0x48000000, sopath =
> "/lib/ld-uClibc-0.9.33.2.so", size = 29052, mtime = 1394229945 }
> [00:14:16.376072696] (+0.000041111) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "telnetd" }, { baddr = 0x48146000, sopath =
> "/usr/lib/liblttng-ust-tracepoint.so.0.0.0", size = 25276, mtime =
> 1394554355 }
> [00:14:16.376104938] (+0.000032242) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "telnetd" }, { baddr = 0x48165000, sopath =
> "/lib/librt-0.9.33.2.so", size = 12404, mtime = 1394229945 }
> [00:14:16.376144635] (+0.000039697) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "telnetd" }, { baddr = 0x48179000, sopath =
> "/usr/lib/liburcu-bp.so.1.0.0", size = 15388, mtime = 1394548454 }
> [00:14:16.376184373] (+0.000039738) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "telnetd" }, { baddr = 0x4818D000, sopath =
> "/usr/lib/liburcu-cds.so.1.0.0", size = 18216, mtime = 1394548454 }
> [00:14:16.376217363] (+0.000032990) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "telnetd" }, { baddr = 0x481A2000, sopath =
> "/lib/libpthread-0.9.33.2.so", size = 70104, mtime = 1394229945 }
> [00:14:16.376257908] (+0.000040545) OpenWrt ust_baddr_statedump:soinfo:
> { cpu_id = 0 }, { procname = "telnetd" }, { baddr = 0x481C6000, sopath =
> "/usr/lib/liburcu-common.so.1.0.0", size = 3188, mtime = 1394548454 }
>
> ----- dump 3 ------------
> nm ipkg-install/bin/busybox | grep 'tracepoint\|busybox_telnetd\|lttng'
>
> 1007b124 d __event_desc___busybox_telnetd
> 1005f7d0 R __event_desc___busybox_telnetd_err
> 1005fee4 R __event_desc___busybox_telnetd_info
> 1005fea4 R __event_desc___busybox_telnetd_session
> 1005f998 r __event_fields___busybox_telnetd___err
> 1005f868 r __event_fields___busybox_telnetd___info
> 1005ff24 r __event_fields___busybox_telnetd___session
> 10016624 t __event_probe__busybox_telnetd___err
> 100164a4 t __event_probe__busybox_telnetd___info
> 10016878 t __event_probe__busybox_telnetd___session
> 1007b134 d _format___busybox_telnetd___err
> 1007b130 d _format___busybox_telnetd___info
> 1007b138 d _format___busybox_telnetd___session
> w _loglevel___busybox_telnetd___err
> w _loglevel___busybox_telnetd___info
> w _loglevel___busybox_telnetd___session
> 10016ca0 t __lttng_events_exit__busybox_telnetd
> 10016c3c t __lttng_events_init__busybox_telnetd
> U lttng_probe_register
> U lttng_probe_unregister
> w _model_emf_uri___busybox_telnetd___err
> w _model_emf_uri___busybox_telnetd___info
> w _model_emf_uri___busybox_telnetd___session
> 1007b13c d __probe_desc___busybox_telnetd
> 1007c228 b __probe_register_refcount___busybox_telnetd
> 1007b1ec A __start___tracepoints_ptrs
> 1007b1f8 A __stop___tracepoints_ptrs
> 1005fe70 R __tp_event_signature___busybox_telnetd___err
> 1005f858 R __tp_event_signature___busybox_telnetd___info
> 1005f810 R __tp_event_signature___busybox_telnetd___session
> 1006ac80 r __tp_strtab_busybox_telnetd___err
> 1006ac94 r __tp_strtab_busybox_telnetd___info
> 1006ac68 r __tp_strtab_busybox_telnetd___session
> 1007b180 D __tracepoint_busybox_telnetd___err
> 1007b1c8 D __tracepoint_busybox_telnetd___info
> 1007b1a4 D __tracepoint_busybox_telnetd___session
> 1007c210 V tracepoint_dlopen
> 100155e8 t __tracepoint__init_urcu_sym
> 1007b250 S __tracepoint_provider_busybox_telnetd
> 1007b1f0 d __tracepoint_ptr_busybox_telnetd___err
> 1007b1f4 d __tracepoint_ptr_busybox_telnetd___info
> 1007b1ec d __tracepoint_ptr_busybox_telnetd___session
> 1007b248 V __tracepoint_ptrs_registered
> 1007b24c V __tracepoint_registered
> 10015708 t __tracepoints__destroy
> 10016ba4 t __tracepoints__destroy
> 10015684 t __tracepoints__init
> 10016ac4 t __tracepoints__init
> 10015868 t __tracepoints__ptrs_destroy
> 100157a0 t __tracepoints__ptrs_init
>
>
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--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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