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Message-ID: <20150413205659.GB14885@kernel.org> Date: Mon, 13 Apr 2015 17:56:59 -0300 From: Arnaldo Carvalho de Melo <acme@...nel.org> To: He Kuang <hekuang@...wei.com> Cc: masami.hiramatsu.pt@...achi.com, a.p.zijlstra@...llo.nl, mingo@...hat.com, namhyung@...nel.org, wangnan0@...wei.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH 2/3] perf probe: Make --source avaiable when probe with lazy_line Em Mon, Apr 13, 2015 at 07:41:29PM +0800, He Kuang escreveu: > Use get_real_path() to enable --source option when probe with lazy_line > pattern. > > Before this patch: > > $ perf probe -s ./kernel_src/ -k ./vmlinux --add='fs/super.c;s->s_count=1;' > Failed to open fs/super.c: No such file or directory > Error: Failed to add events. > > After this patch: > > $ perf probe -s ./kernel_src/ -k ./vmlinux --add='fs/super.c;s->s_count=1;' > Added new events: > probe:_stext (on @fs/super.c) > probe:_stext_1 (on @fs/super.c) > ... Tried just doing: [root@...andy ~]# ulimit -c 100000000 [root@...andy ~]# perf probe --add='fs/super.c;s->s_count=1;' Segmentation fault (core dumped) I.e. not specifying vmlinux, as it finds the right one looking at the vmlinux path, and as well not specifying -s, as it should find that as well from the vmlinux file, but here I get a segfault: [root@...andy ~]# gdb -c core.26128 ~/bin/perf <SNIP> Core was generated by `perf probe --add=fs/super.c;s->s_count=1;'. Program terminated with signal 11, Segmentation fault. #0 0x00007f2a021301c1 in dwarf_tag () from /lib64/libdw.so.1 Missing separate debuginfos, use: debuginfo-install audit-libs-2.4.1-5.el7.x86_64 bzip2-libs-1.0.6-12.el7.x86_64 elfutils-libelf-0.160-1.el7.x86_64 elfutils-libs-0.160-1.el7.x86_64 glibc-2.17-78.el7.x86_64 libgcc-4.8.3-9.el7.x86_64 libunwind-1.1-3.el7.x86_64 nss-softokn-freebl-3.16.2.3-9.el7.x86_64 numactl-libs-2.0.9-4.el7.x86_64 perl-libs-5.16.3-285.el7.x86_64 python-libs-2.7.5-16.el7.x86_64 slang-2.2.4-11.el7.x86_64 xz-libs-5.1.2-9alpha.el7.x86_64 zlib-1.2.7-13.el7.x86_64 (gdb) bt #0 0x00007f2a021301c1 in dwarf_tag () from /lib64/libdw.so.1 #1 0x00000000004e3b78 in die_walk_lines (rt_die=rt_die@...ry=0x0, callback=callback@...ry=0x4e0b10 <probe_point_lazy_walker>, data=data@...ry=0x7ffff2da1750) at util/dwarf-aux.c:690 #2 0x00000000004dff19 in find_probe_point_lazy (sp_die=sp_die@...ry=0x0, pf=pf@...ry=0x7ffff2da1750) at util/probe-finder.c:867 #3 0x00000000004e06e2 in debuginfo__find_probes (pf=pf@...ry=0x7ffff2da1750, dbg=0x1767c50) at util/probe-finder.c:1058 #4 0x00000000004e13b2 in debuginfo__find_trace_events (dbg=dbg@...ry=0x1767c50, pev=pev@...ry=0x8fcd90 <params+16>, tevs=tevs@...ry=0x1763978, max_tevs=max_tevs@...ry=128) at util/probe-finder.c:1218 #5 0x00000000004dcbea in try_to_find_probe_trace_events (target=0x0, max_tevs=128, tevs=0x1763978, pev=0x8fcd90 <params+16>) at util/probe-event.c:611 #6 convert_to_probe_trace_events (target=0x0, max_tevs=128, tevs=0x1763978, pev=0x8fcd90 <params+16>) at util/probe-event.c:2645 #7 add_perf_probe_events (pevs=pevs@...ry=0x8fcd90 <params+16>, npevs=<optimized out>, max_tevs=128, force_add=false) at util/probe-event.c:2680 #8 0x000000000044fa7b in __cmd_probe (argc=<optimized out>, argv=argv@...ry=0x7ffff2da2600, prefix=<optimized out>) at builtin-probe.c:504 #9 0x000000000044fc34 in cmd_probe (argc=<optimized out>, argv=0x7ffff2da2600, prefix=<optimized out>) at builtin-probe.c:521 #10 0x0000000000470b35 in run_builtin (p=p@...ry=0x838420 <commands+384>, argc=argc@...ry=2, argv=argv@...ry=0x7ffff2da2600) at perf.c:370 #11 0x000000000041d220 in handle_internal_command (argv=0x7ffff2da2600, argc=2) at perf.c:429 #12 run_argv (argv=0x7ffff2da2380, argcp=0x7ffff2da238c) at perf.c:473 #13 main (argc=2, argv=0x7ffff2da2600) at perf.c:588 (gdb) Now with your patch, another coredump: [root@...andy ~]# rm -f core.26128 [root@...andy ~]# perf probe --add='fs/super.c;s->s_count=1;' Segmentation fault (core dumped) [root@...andy ~]# [root@...andy ~]# gdb -c core.26712 ~/bin/perf <SNIP> Core was generated by `perf probe --add=fs/super.c;s->s_count=1;'. Program terminated with signal 11, Segmentation fault. #0 0x00007f25cf4e61c1 in dwarf_tag () from /lib64/libdw.so.1 Missing separate debuginfos, use: debuginfo-install audit-libs-2.4.1-5.el7.x86_64 bzip2-libs-1.0.6-12.el7.x86_64 elfutils-libelf-0.160-1.el7.x86_64 elfutils-libs-0.160-1.el7.x86_64 glibc-2.17-78.el7.x86_64 libgcc-4.8.3-9.el7.x86_64 libunwind-1.1-3.el7.x86_64 nss-softokn-freebl-3.16.2.3-9.el7.x86_64 numactl-libs-2.0.9-4.el7.x86_64 perl-libs-5.16.3-285.el7.x86_64 python-libs-2.7.5-16.el7.x86_64 slang-2.2.4-11.el7.x86_64 xz-libs-5.1.2-9alpha.el7.x86_64 zlib-1.2.7-13.el7.x86_64 (gdb) bt #0 0x00007f25cf4e61c1 in dwarf_tag () from /lib64/libdw.so.1 #1 0x00000000004e3c18 in die_walk_lines (rt_die=rt_die@...ry=0x0, callback=callback@...ry=0x4e0bb0 <probe_point_lazy_walker>, data=data@...ry=0x7ffdf9244df0) at util/dwarf-aux.c:690 #2 0x00000000004dff9b in find_probe_point_lazy (sp_die=sp_die@...ry=0x0, pf=pf@...ry=0x7ffdf9244df0) at util/probe-finder.c:879 #3 0x00000000004e0782 in debuginfo__find_probes (pf=pf@...ry=0x7ffdf9244df0, dbg=0xe3ec50) at util/probe-finder.c:1070 #4 0x00000000004e1452 in debuginfo__find_trace_events (dbg=dbg@...ry=0xe3ec50, pev=pev@...ry=0x8fcd90 <params+16>, tevs=tevs@...ry=0xe3a978, max_tevs=max_tevs@...ry=128) at util/probe-finder.c:1230 #5 0x00000000004dcc2a in try_to_find_probe_trace_events (target=0x0, max_tevs=128, tevs=0xe3a978, pev=0x8fcd90 <params+16>) at util/probe-event.c:611 #6 convert_to_probe_trace_events (target=0x0, max_tevs=128, tevs=0xe3a978, pev=0x8fcd90 <params+16>) at util/probe-event.c:2645 #7 add_perf_probe_events (pevs=pevs@...ry=0x8fcd90 <params+16>, npevs=<optimized out>, max_tevs=128, force_add=false) at util/probe-event.c:2680 #8 0x000000000044faab in __cmd_probe (argc=<optimized out>, argv=argv@...ry=0x7ffdf9245ca0, prefix=<optimized out>) at builtin-probe.c:504 #9 0x000000000044fc64 in cmd_probe (argc=<optimized out>, argv=0x7ffdf9245ca0, prefix=<optimized out>) at builtin-probe.c:521 #10 0x0000000000470b65 in run_builtin (p=p@...ry=0x838420 <commands+384>, argc=argc@...ry=2, argv=argv@...ry=0x7ffdf9245ca0) at perf.c:370 #11 0x000000000041d250 in handle_internal_command (argv=0x7ffdf9245ca0, argc=2) at perf.c:429 #12 run_argv (argv=0x7ffdf9245a20, argcp=0x7ffdf9245a2c) at perf.c:473 #13 main (argc=2, argv=0x7ffdf9245ca0) at perf.c:588 (gdb) Trying exactly as you did, first without the patch: [root@...andy linux]# perf probe -s /home/acme/git/linux/ -k ../build/v4.0.0-rc6+/vmlinux --add='fs/super.c;s->s_count=1;' Segmentation fault (core dumped) [root@...andy linux]# Now with it: [root@...andy linux]# perf probe -s /home/acme/git/linux/ -k ../build/v4.0.0-rc6+/vmlinux --add='fs/super.c;s->s_count=1;' Segmentation fault (core dumped) [root@...andy linux]# Core was generated by `perf probe -s /home/acme/git/linux/ -k ../build/v4.0.0-rc6+/vmlinux --add=fs/su'. Program terminated with signal 11, Segmentation fault. #0 0x00007f76795c01c1 in dwarf_tag () from /lib64/libdw.so.1 Missing separate debuginfos, use: debuginfo-install audit-libs-2.4.1-5.el7.x86_64 bzip2-libs-1.0.6-12.el7.x86_64 elfutils-libelf-0.160-1.el7.x86_64 elfutils-libs-0.160-1.el7.x86_64 glibc-2.17-78.el7.x86_64 libgcc-4.8.3-9.el7.x86_64 libunwind-1.1-3.el7.x86_64 nss-softokn-freebl-3.16.2.3-9.el7.x86_64 numactl-libs-2.0.9-4.el7.x86_64 perl-libs-5.16.3-285.el7.x86_64 python-libs-2.7.5-16.el7.x86_64 slang-2.2.4-11.el7.x86_64 xz-libs-5.1.2-9alpha.el7.x86_64 zlib-1.2.7-13.el7.x86_64 (gdb) bt #0 0x00007f76795c01c1 in dwarf_tag () from /lib64/libdw.so.1 #1 0x00000000004e3c18 in die_walk_lines (rt_die=rt_die@...ry=0x0, callback=callback@...ry=0x4e0bb0 <probe_point_lazy_walker>, data=data@...ry=0x7ffcf282f280) at util/dwarf-aux.c:690 #2 0x00000000004dff9b in find_probe_point_lazy (sp_die=sp_die@...ry=0x0, pf=pf@...ry=0x7ffcf282f280) at util/probe-finder.c:879 #3 0x00000000004e0782 in debuginfo__find_probes (pf=pf@...ry=0x7ffcf282f280, dbg=0x19c1b30) at util/probe-finder.c:1070 #4 0x00000000004e1452 in debuginfo__find_trace_events (dbg=dbg@...ry=0x19c1b30, pev=pev@...ry=0x8fcd90 <params+16>, tevs=tevs@...ry=0x19be778, max_tevs=max_tevs@...ry=128) at util/probe-finder.c:1230 #5 0x00000000004dcc2a in try_to_find_probe_trace_events (target=0x0, max_tevs=128, tevs=0x19be778, pev=0x8fcd90 <params+16>) at util/probe-event.c:611 #6 convert_to_probe_trace_events (target=0x0, max_tevs=128, tevs=0x19be778, pev=0x8fcd90 <params+16>) at util/probe-event.c:2645 #7 add_perf_probe_events (pevs=pevs@...ry=0x8fcd90 <params+16>, npevs=<optimized out>, max_tevs=128, force_add=false) at util/probe-event.c:2680 #8 0x000000000044faab in __cmd_probe (argc=<optimized out>, argv=argv@...ry=0x7ffcf2830130, prefix=<optimized out>) at builtin-probe.c:504 #9 0x000000000044fc64 in cmd_probe (argc=<optimized out>, argv=0x7ffcf2830130, prefix=<optimized out>) at builtin-probe.c:521 #10 0x0000000000470b65 in run_builtin (p=p@...ry=0x838420 <commands+384>, argc=argc@...ry=6, argv=argv@...ry=0x7ffcf2830130) at perf.c:370 #11 0x000000000041d250 in handle_internal_command (argv=0x7ffcf2830130, argc=6) at perf.c:429 #12 run_argv (argv=0x7ffcf282feb0, argcp=0x7ffcf282febc) at perf.c:473 #13 main (argc=6, argv=0x7ffcf2830130) at perf.c:588 (gdb) And: [acme@...andy linux]$ ls -la /home/acme/git/linux/fs/super.c -rw-rw-r--. 1 acme acme 36192 Abr 7 17:59 /home/acme/git/linux/fs/super.c Processed [1/3], looking if [3/3] can be applied independently of this one. - Arnaldo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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