ASAN Builds Error on Hello world

[JohnathanNorman]

builds made with "--enable-asan" will crash on any input

spoofy@puter:~/src/hermes/build_asan/bin$ echo "'use strict'; function hello() { print('Hello World'); } hello();" | ./hermes 
Hello World

=================================================================
==6796==ERROR: AddressSanitizer: attempting free on address which was not malloc()-ed: 0x7fa045538000 in thread T0
    #0 0x7fa04444e7b8 in __interceptor_free (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xde7b8)
    #1 0x55e6e7cd4321 in hermes::oscompat::SigAltStackDeleter::~SigAltStackDeleter() ../lib/Support/OSCompatPosix.cpp:522
    #2 0x55e6e7607800 in main ../tools/hermes/hermes.cpp:181
    #3 0x7fa0429c0b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #4 0x55e6e7606129 in _start (/home/spoofy/src/hermes/build_asan/bin/hermes+0x322129)

Address 0x7fa045538000 is a wild pointer.
SUMMARY: AddressSanitizer: bad-free (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xde7b8) in __interceptor_free

tested on commit 41a8072 .

[tmikov]

Ironically this is caused by a workaround for a leak that ASAN was reporting. Can you please share details about your system configuration: which Linux version and more importantly which compiler version?

[JohnathanNorman]

clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
Target: x86_64-pc-linux-gnu
Thread model: posix

Ubuntu 18.04.3 LTS

[tmikov]

Thank you! We are working on fixing this (for some reason it wasn't showing in our continuous ASAN tests).

[davedets]

Jonathan -- Hi! We believe we fixed this in Hermes quite a while ago; my apologies for not noting that here. Would you be able to verify whether this problem has gone away for you?

[davedets]

I'm going to close, assuming that our fix did in fact work.