Bug #87216 gen_lex_hash -DWITH_MSAN=ON build error

• Submitted: 27 Jul 2017 2:57
• Modified: 4 Oct 2017 8:25
• Reporter: Laurynas Biveinis (OCA)
• Status: Verified
• Category: MySQL Server: Compiling
• Severity: S3 (Non-critical)
• Version: 8.0.2, 8.0.3
• OS: Any
• CPU Architecture: Any
• Tags: msan

[27 Jul 2017 2:57] Laurynas Biveinis

Description:
With 8.0.2, using -DWITH_MSAN=ON with clang 4.0.0 results in a build error:

[  9%] Generating lex_hash.h
==19978==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x498d25  (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x498d25)
    #1 0x498194  (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x498194)
    #2 0x497d2d  (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x497d2d)
    #3 0x497400  (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x497400)
    #4 0x496cee  (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x496cee)
    #5 0x4977c8  (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x4977c8)
    #6 0x7f6a146be3f0  (/lib/x86_64-linux-gnu/libc.so.6+0x203f0)
    #7 0x41c7e9  (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x41c7e9)

  Uninitialized value was created by a heap allocation
    #0 0x492a60  (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x492a60)
    #1 0x49a0aa  (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x49a0aa)
    #2 0x499106  (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x499106)
    #3 0x4982c5  (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x4982c5)
    #4 0x497d2d  (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x497d2d)
    #5 0x497400  (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x497400)
    #6 0x496cee  (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x496cee)
    #7 0x4977c8  (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x4977c8)
    #8 0x7f6a146be3f0  (/lib/x86_64-linux-gnu/libc.so.6+0x203f0)

SUMMARY: MemorySanitizer: use-of-uninitialized-value (/home/laurynas/obj-mysql-8.0.2-pp-msan-debug/sql/gen_lex_hash+0x498d25) 
Exiting

How to repeat:
cmake ... -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DWITH_MSAN=ON

[27 Jul 2017 6:33] MySQL Verification Team

Hello Laurynas,

Thank you for the report.

Thanks,
Umesh

[4 Oct 2017 8:25] Laurynas Biveinis

Same on 8.0.3.