From: Milian Wolff <milian.wolff@kdab.com>
To: acme@kernel.org, jolsa@kernel.org, yao.jin@linux.intel.com,
namhyung@kernel.org
Cc: Linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Milian Wolff <milian.wolff@kdab.com>
Subject: [PATCH 3/3] perf report: don't crash on invalid inline debug information
Date: Wed, 26 Sep 2018 15:52:07 +0200 [thread overview]
Message-ID: <20180926135207.30263-3-milian.wolff@kdab.com> (raw)
In-Reply-To: <20180926135207.30263-1-milian.wolff@kdab.com>
When the function name for an inline frame is invalid, we must
not try to demangle this symbol, otherwise we crash with:
#0 0x0000555555895c01 in bfd_demangle ()
#1 0x0000555555823262 in demangle_sym (dso=0x555555d92b90, elf_name=0x0, kmodule=0) at util/symbol-elf.c:215
#2 dso__demangle_sym (dso=dso@entry=0x555555d92b90, kmodule=<optimized out>, kmodule@entry=0, elf_name=elf_name@entry=0x0) at util/symbol-elf.c:400
#3 0x00005555557fef4b in new_inline_sym (funcname=0x0, base_sym=0x555555d92b90, dso=0x555555d92b90) at util/srcline.c:89
#4 inline_list__append_dso_a2l (dso=dso@entry=0x555555c7bb00, node=node@entry=0x555555e31810, sym=sym@entry=0x555555d92b90) at util/srcline.c:264
#5 0x00005555557ff27f in addr2line (dso_name=dso_name@entry=0x555555d92430 "/home/milian/.debug/.build-id/f7/186d14bb94f3c6161c010926da66033d24fce5/elf", addr=addr@entry=2888, file=file@entry=0x0,
line=line@entry=0x0, dso=dso@entry=0x555555c7bb00, unwind_inlines=unwind_inlines@entry=true, node=0x555555e31810, sym=0x555555d92b90) at util/srcline.c:313
#6 0x00005555557ffe7c in addr2inlines (sym=0x555555d92b90, dso=0x555555c7bb00, addr=2888, dso_name=0x555555d92430 "/home/milian/.debug/.build-id/f7/186d14bb94f3c6161c010926da66033d24fce5/elf")
at util/srcline.c:358
So instead handle the case where we get invalid function names
for inlined frames and use a fallback '??' function name instead.
While this crash was originally reported by Hadrien for rust code,
I can now also reproduce it with trivial C++ code. Indeed, it seems
like libbfd fails to interpret the debug information for the inline
frame symbol name:
$ addr2line -e /home/milian/.debug/.build-id/f7/186d14bb94f3c6161c010926da66033d24fce5/elf -if b48
main
/usr/include/c++/8.2.1/complex:610
??
/usr/include/c++/8.2.1/complex:618
??
/usr/include/c++/8.2.1/complex:675
??
/usr/include/c++/8.2.1/complex:685
main
/home/milian/projects/kdab/rnd/hotspot/tests/test-clients/cpp-inlining/main.cpp:39
I've reported this bug upstream and also attached a patch there
which should fix this issue:
https://sourceware.org/bugzilla/show_bug.cgi?id=23715
Signed-off-by: Milian Wolff <milian.wolff@kdab.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Reported-by: Hadrien Grasland <grasland@lal.in2p3.fr>
---
tools/perf/util/srcline.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
index 09d6746e6ec8..e767c4a9d4d2 100644
--- a/tools/perf/util/srcline.c
+++ b/tools/perf/util/srcline.c
@@ -85,6 +85,9 @@ static struct symbol *new_inline_sym(struct dso *dso,
struct symbol *inline_sym;
char *demangled = NULL;
+ if (!funcname)
+ funcname = "??";
+
if (dso) {
demangled = dso__demangle_sym(dso, 0, funcname);
if (demangled)
--
2.19.0
next prev parent reply other threads:[~2018-09-26 13:58 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-26 13:52 [PATCH 1/3] perf report: don't try to map ip to invalid map Milian Wolff
2018-09-26 13:52 ` [PATCH 2/3] perf report: use the offset address to find inline frames Milian Wolff
2018-09-27 16:00 ` Jiri Olsa
2018-09-27 19:12 ` Arnaldo Carvalho de Melo
2018-10-02 7:39 ` [PATCH] perf record: use unmapped IP for inline callchain cursors Milian Wolff
2018-10-02 15:32 ` Arnaldo Carvalho de Melo
2018-10-03 3:35 ` Ravi Bangoria
2018-10-05 13:48 ` Arnaldo Carvalho de Melo
2018-10-08 18:49 ` Milian Wolff
2018-10-05 14:11 ` Arnaldo Carvalho de Melo
2018-10-05 16:21 ` [tip:perf/urgent] perf record: Use " tip-bot for Milian Wolff
2018-09-26 13:52 ` Milian Wolff [this message]
2018-09-27 19:10 ` [PATCH 3/3] perf report: don't crash on invalid inline debug information Arnaldo Carvalho de Melo
2018-10-11 18:23 ` Milian Wolff
2018-10-11 19:39 ` Arnaldo Carvalho de Melo
2018-10-15 20:51 ` Milian Wolff
2018-10-16 17:49 ` Arnaldo Carvalho de Melo
2018-10-16 17:52 ` Arnaldo Carvalho de Melo
2018-10-16 19:00 ` Milian Wolff
2018-10-16 20:06 ` Arnaldo Carvalho de Melo
2018-10-18 6:20 ` [tip:perf/urgent] perf report: Don't " tip-bot for Milian Wolff
2018-09-26 14:18 ` [PATCH 1/3] perf report: don't try to map ip to invalid map Arnaldo Carvalho de Melo
2018-09-26 14:41 ` Milian Wolff
2018-09-27 19:07 ` Arnaldo Carvalho de Melo
2018-09-27 8:48 ` Sandipan Das
2018-09-27 19:11 ` Arnaldo Carvalho de Melo
2018-09-27 16:02 ` Jiri Olsa
2018-10-05 16:20 ` [tip:perf/urgent] perf report: Don't " tip-bot for Milian Wolff
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