008+ prompt> ASAN:DEADLYSIGNAL
009+ =================================================================
010+ ==269162==ERROR: AddressSanitizer: SEGV on unknown address 0x7f1fbae1f080 (pc 0x000001c4abb9 bp 0x0fe3f75c3e10 sp 0x7ffce353c980 T0)
011+ ==269162==The signal is caused by a WRITE memory access.
012+ #0 0x1c4abb8 (/home/tunguyen/Downloads/php-src-php-7.2.11/sapi/phpdbg/phpdbg+0x1c4abb8)
013+ #1 0x1efd444 (/home/tunguyen/Downloads/php-src-php-7.2.11/sapi/phpdbg/phpdbg+0x1efd444)
014+ #2 0x1aca352 (/home/tunguyen/Downloads/php-src-php-7.2.11/sapi/phpdbg/phpdbg+0x1aca352)
015+ #3 0x1ee774b (/home/tunguyen/Downloads/php-src-php-7.2.11/sapi/phpdbg/phpdbg+0x1ee774b)
016+ #4 0x1f422cf (/home/tunguyen/Downloads/php-src-php-7.2.11/sapi/phpdbg/phpdbg+0x1f422cf)
017+ #5 0x1ef7529 (/home/tunguyen/Downloads/php-src-php-7.2.11/sapi/phpdbg/phpdbg+0x1ef7529)
018+ #6 0x1ecd73b (/home/tunguyen/Downloads/php-src-php-7.2.11/sapi/phpdbg/phpdbg+0x1ecd73b)
019+ #7 0x7f1fc00aa0b2 (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
020+ #8 0x444e6d (/home/tunguyen/Downloads/php-src-php-7.2.11/sapi/phpdbg/phpdbg+0x444e6d)
021+
022+ AddressSanitizer can not provide additional info.
023+ SUMMARY: AddressSanitizer: SEGV (/home/tunguyen/Downloads/php-src-php-7.2.11/sapi/phpdbg/phpdbg+0x1c4abb8)
024+ ==269162==ABORTING
008- prompt> [Breaking on watchpoint $b]
009- Old value:
010- New value: Array ([0] => 1)
011- >00006: unset($b);
012- 00007: $b = 2;
013- 00008:
014- prompt> [Breaking on watchpoint $b]
015- Old value inaccessible or destroyed
016- New value:
017- >00007: $b = 2;
018- 00008:
019- prompt> [Breaking on watchpoint $b]
020- Old value:
021- New value: 2
022- >00008:
023- prompt> [$b has been removed, removing watchpoint recursively]
024- [Script ended normally]
025- prompt>