From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: git@vger.kernel.org
Cc: "Junio C Hamano" <gitster@pobox.com>,
"Taylor Blau" <me@ttaylorr.com>,
"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: [PATCH v2 4/4] test-lib: add "fast_unwind_on_malloc=0" to LSAN_OPTIONS
Date: Sat, 19 Feb 2022 12:29:43 +0100 [thread overview]
Message-ID: <patch-v2-4.4-e6a48b6e4ce-20220219T112653Z-avarab@gmail.com> (raw)
In-Reply-To: <cover-v2-0.4-00000000000-20220219T112653Z-avarab@gmail.com>
Add "fast_unwind_on_malloc=0" to LSAN_OPTIONS to get more meaningful
stack traces from LSAN. This isn't required under ASAN which will emit
traces such as this one for a leak in "t/t0006-date.sh":
$ ASAN_OPTIONS=detect_leaks=1 ./t0006-date.sh -vixd
[...]
Direct leak of 3 byte(s) in 1 object(s) allocated from:
#0 0x488b94 in strdup (t/helper/test-tool+0x488b94)
#1 0x9444a4 in xstrdup wrapper.c:29:14
#2 0x5995fa in parse_date_format date.c:991:24
#3 0x4d2056 in show_dates t/helper/test-date.c:39:2
#4 0x4d174a in cmd__date t/helper/test-date.c:116:3
#5 0x4cce89 in cmd_main t/helper/test-tool.c:127:11
#6 0x4cd1e3 in main common-main.c:52:11
#7 0x7fef3c695e49 in __libc_start_main csu/../csu/libc-start.c:314:16
#8 0x422b09 in _start (t/helper/test-tool+0x422b09)
SUMMARY: AddressSanitizer: 3 byte(s) leaked in 1 allocation(s).
Aborted
Whereas LSAN would emit this instead:
$ ./t0006-date.sh -vixd
[...]
Direct leak of 3 byte(s) in 1 object(s) allocated from:
#0 0x4323b8 in malloc (t/helper/test-tool+0x4323b8)
#1 0x7f2be1d614aa in strdup string/strdup.c:42:15
SUMMARY: LeakSanitizer: 3 byte(s) leaked in 1 allocation(s).
Aborted
Now we'll instead git this sensible stack trace under
LSAN. I.e. almost the same one (but starting with "malloc", as is
usual for LSAN) as under ASAN:
Direct leak of 3 byte(s) in 1 object(s) allocated from:
#0 0x4323b8 in malloc (t/helper/test-tool+0x4323b8)
#1 0x7f012af5c4aa in strdup string/strdup.c:42:15
#2 0x5cb164 in xstrdup wrapper.c:29:14
#3 0x495ee9 in parse_date_format date.c:991:24
#4 0x453aac in show_dates t/helper/test-date.c:39:2
#5 0x453782 in cmd__date t/helper/test-date.c:116:3
#6 0x451d95 in cmd_main t/helper/test-tool.c:127:11
#7 0x451f1e in main common-main.c:52:11
#8 0x7f012aef5e49 in __libc_start_main csu/../csu/libc-start.c:314:16
#9 0x42e0a9 in _start (t/helper/test-tool+0x42e0a9)
SUMMARY: LeakSanitizer: 3 byte(s) leaked in 1 allocation(s).
Aborted
As the option name suggests this does make things slower, e.g. for
t0001-init.sh we're around 10% slower:
$ hyperfine -L v 0,1 'LSAN_OPTIONS=fast_unwind_on_malloc={v} make T=t0001-init.sh' -r 3
Benchmark 1: LSAN_OPTIONS=fast_unwind_on_malloc=0 make T=t0001-init.sh
Time (mean ± σ): 2.135 s ± 0.015 s [User: 1.951 s, System: 0.554 s]
Range (min … max): 2.122 s … 2.152 s 3 runs
Benchmark 2: LSAN_OPTIONS=fast_unwind_on_malloc=1 make T=t0001-init.sh
Time (mean ± σ): 1.981 s ± 0.055 s [User: 1.769 s, System: 0.488 s]
Range (min … max): 1.941 s … 2.044 s 3 runs
Summary
'LSAN_OPTIONS=fast_unwind_on_malloc=1 make T=t0001-init.sh' ran
1.08 ± 0.03 times faster than 'LSAN_OPTIONS=fast_unwind_on_malloc=0 make T=t0001-init.sh'
I think that's more than worth it to get the more meaningful stack
traces, we can always provide LSAN_OPTIONS=fast_unwind_on_malloc=0 for
one-off "fast" runs.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
t/test-lib.sh | 1 +
1 file changed, 1 insertion(+)
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 80944035f2c..129668c685f 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -71,6 +71,7 @@ prepend_var ASAN_OPTIONS : detect_leaks=0
export ASAN_OPTIONS
prepend_var LSAN_OPTIONS : $GIT_XSAN_OPTIONS
+prepend_var LSAN_OPTIONS : fast_unwind_on_malloc=0
export LSAN_OPTIONS
if test ! -f "$GIT_BUILD_DIR"/GIT-BUILD-OPTIONS
--
2.35.1.1130.g7c6dd716f26
next prev parent reply other threads:[~2022-02-19 11:30 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-18 21:01 [PATCH 0/4] test-lib: improve LSAN + ASAN stack traces Ævar Arnfjörð Bjarmason
2022-02-18 21:01 ` [PATCH 1/4] test-lib: add XSAN_OPTIONS, inherit [AL]SAN_OPTIONS Ævar Arnfjörð Bjarmason
2022-02-18 23:20 ` Junio C Hamano
2022-02-19 2:41 ` Taylor Blau
2022-02-19 2:48 ` Ævar Arnfjörð Bjarmason
2022-02-19 2:57 ` Taylor Blau
2022-02-19 3:02 ` Ævar Arnfjörð Bjarmason
2022-02-19 3:51 ` Taylor Blau
2022-02-18 21:01 ` [PATCH 2/4] test-lib: make $GIT_BUILD_DIR an absolute path Ævar Arnfjörð Bjarmason
2022-02-18 23:30 ` Junio C Hamano
2022-02-19 1:58 ` Ævar Arnfjörð Bjarmason
2022-02-19 11:29 ` [PATCH v2 0/4] test-lib: improve LSAN + ASAN stack traces Ævar Arnfjörð Bjarmason
2022-02-19 11:29 ` [PATCH v2 1/4] test-lib: add GIT_XSAN_OPTIONS, inherit [AL]SAN_OPTIONS Ævar Arnfjörð Bjarmason
2022-02-20 7:52 ` Junio C Hamano
2022-02-19 11:29 ` [PATCH v2 2/4] test-lib: correct commentary on TEST_DIRECTORY overriding Ævar Arnfjörð Bjarmason
2022-02-19 11:29 ` [PATCH v2 3/4] test-lib: make $GIT_BUILD_DIR an absolute path Ævar Arnfjörð Bjarmason
2022-02-19 11:29 ` Ævar Arnfjörð Bjarmason [this message]
2022-02-21 2:30 ` [PATCH v2 0/4] test-lib: improve LSAN + ASAN stack traces Taylor Blau
2022-02-21 15:58 ` [PATCH v3 " Ævar Arnfjörð Bjarmason
2022-02-21 15:58 ` [PATCH v3 1/4] test-lib: add GIT_SAN_OPTIONS, inherit [AL]SAN_OPTIONS Ævar Arnfjörð Bjarmason
2022-02-21 15:58 ` [PATCH v3 2/4] test-lib: correct commentary on TEST_DIRECTORY overriding Ævar Arnfjörð Bjarmason
2022-02-21 15:58 ` [PATCH v3 3/4] test-lib: make $GIT_BUILD_DIR an absolute path Ævar Arnfjörð Bjarmason
2022-02-21 17:29 ` Taylor Blau
2022-02-21 18:55 ` Ævar Arnfjörð Bjarmason
2022-02-22 7:19 ` Junio C Hamano
2022-02-22 10:14 ` Ævar Arnfjörð Bjarmason
2022-02-23 20:16 ` Junio C Hamano
2022-02-24 9:14 ` Ævar Arnfjörð Bjarmason
2022-02-24 20:05 ` Junio C Hamano
2022-02-21 15:58 ` [PATCH v3 4/4] test-lib: add "fast_unwind_on_malloc=0" to LSAN_OPTIONS Ævar Arnfjörð Bjarmason
2022-02-21 17:32 ` Taylor Blau
2022-02-21 18:59 ` Ævar Arnfjörð Bjarmason
2022-02-21 17:16 ` [PATCH v3 0/4] test-lib: improve LSAN + ASAN stack traces Junio C Hamano
2022-02-21 18:55 ` Ævar Arnfjörð Bjarmason
2022-02-27 10:25 ` [PATCH v4 " Ævar Arnfjörð Bjarmason
2022-02-27 10:25 ` [PATCH v4 1/4] test-lib: add GIT_SAN_OPTIONS, inherit [AL]SAN_OPTIONS Ævar Arnfjörð Bjarmason
2022-02-27 10:25 ` [PATCH v4 2/4] test-lib: correct and assert TEST_DIRECTORY overriding Ævar Arnfjörð Bjarmason
2022-02-27 10:25 ` [PATCH v4 3/4] test-lib: make $GIT_BUILD_DIR an absolute path Ævar Arnfjörð Bjarmason
2022-02-27 10:25 ` [PATCH v4 4/4] test-lib: add "fast_unwind_on_malloc=0" to LSAN_OPTIONS Ævar Arnfjörð Bjarmason
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