[chromium-dev] asan content_shell signal 11 preventing local reproduction

['David Grogan' via Chromium-dev]

I'm trying to reproduce a crash <https://crbug.com/909021> that
chromium.webkit/WebKit
Linux Trusty ASAN caught. But when I run a local asan content_shell it gets
signal 11 before it finds the use after free. Layout tests that the bot
approved also get signal 11. How can I debug my local asan setup?

the base_unittests example from the ancient
https://www.chromium.org/developers/testing/addresssanitizer
gets the buffer overrun.

I get the signal 11 with either of these 2 commands

$ ./third_party/blink/tools/run_web_tests.py --disable-breakpad -t asan
--clobber-old-results --no-retry-failures
virtual/layout_ng_experimental/css3/flexbox/flex-flow-padding.html
$ out/asan/content_shell --enable-blink-features=LayoutNGFlexBox
third_party/blink/web_tests/css3/flexbox/flex-flow-padding.html

My args.gn:

$ cat out/asan/args.gn
# Build arguments go here.
# See "gn args <out_dir> --list" for available build arguments.

enable_nacl = false
enable_pdf = false
enable_print_preview = false
google_api_key = ...
google_default_client_id = ...
google_default_client_secret = ...
is_component_build = true
use_goma = true
is_debug = false
dcheck_always_on = true
is_asan = true

[Lei Zhang]

Maybe flip is_debug to true, and run content_shell in gdb to see why
it is getting a SIGSEGV?
On Tue, Nov 27, 2018 at 7:19 PM 'David Grogan' via Chromium-dev

I'm trying to reproduce a crash that chromium.webkit/WebKit Linux Trusty ASAN caught. But when I run a local asan content_shell it gets signal 11 before it finds the use after free. Layout tests that the bot approved also get signal 11. How can I debug my local asan setup?
the base_unittests example from the ancient https://www.chromium.org/developers/testing/addresssanitizer gets the buffer overrun.
I get the signal 11 with either of these 2 commands
$ ./third_party/blink/tools/run_web_tests.py --disable-breakpad -t asan --clobber-old-results --no-retry-failures virtual/layout_ng_experimental/css3/flexbox/flex-flow-padding.html
$ out/asan/content_shell --enable-blink-features=LayoutNGFlexBox third_party/blink/web_tests/css3/flexbox/flex-flow-padding.html
$ cat out/asan/args.gn
# Build arguments go here.
# See "gn args <out_dir> --list" for available build arguments.
enable_nacl = false
enable_pdf = false
enable_print_preview = false
google_api_key = ...
google_default_client_id = ...
google_default_client_secret = ...
is_component_build = true
use_goma = true
is_debug = false
dcheck_always_on = true
is_asan = true
--
--
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['David Grogan' via Chromium-dev]

Removing dcheck_always_on and is_component_build made asan work again

Post by Lei Zhang
Maybe flip is_debug to true, and run content_shell in gdb to see why
it is getting a SIGSEGV?
On Tue, Nov 27, 2018 at 7:19 PM 'David Grogan' via Chromium-dev

I'm trying to reproduce a crash that chromium.webkit/WebKit Linux Trusty

ASAN caught. But when I run a local asan content_shell it gets signal 11
before it finds the use after free. Layout tests that the bot approved also
get signal 11. How can I debug my local asan setup?

the base_unittests example from the ancient

https://www.chromium.org/developers/testing/addresssanitizer gets the
buffer overrun.

I get the signal 11 with either of these 2 commands
$ ./third_party/blink/tools/run_web_tests.py --disable-breakpad -t asan

--clobber-old-results --no-retry-failures
virtual/layout_ng_experimental/css3/flexbox/flex-flow-padding.html

$ out/asan/content_shell --enable-blink-features=LayoutNGFlexBox

third_party/blink/web_tests/css3/flexbox/flex-flow-padding.html

$ cat out/asan/args.gn
# Build arguments go here.
# See "gn args <out_dir> --list" for available build arguments.
enable_nacl = false
enable_pdf = false
enable_print_preview = false
google_api_key = ...
google_default_client_id = ...
google_default_client_secret = ...
is_component_build = true
use_goma = true
is_debug = false
dcheck_always_on = true
is_asan = true
--
--
http://groups.google.com/a/chromium.org/group/chromium-dev
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.