TSAN/MSAN fails with vm.mmap_rnd_bits=32 even with llvm 18.1.3 #30674
Description
The Cirrus CI on my fork of the repo runs on Ubuntu 24.04 with kernel version 6.8.0-38. This has vm.mmap_rnd_bits=32 set, which causes the TSAN and MSAN jobs to fail.
See:
TSAN: https://cirrus-ci.com/task/6619444124844032
FAIL: minisketch/test
=====================
ThreadSanitizer: CHECK failed: tsan_platform_linux.cpp:282 "((personality(old_personality | ADDR_NO_RANDOMIZE))) != ((-1))" (0xffffffffffffffff, 0xffffffffffffffff) (tid=42931)
FAIL minisketch/test (exit status: 139)
FAIL: univalue/test/object
==========================
ThreadSanitizer: CHECK failed: tsan_platform_linux.cpp:282 "((personality(old_personality | ADDR_NO_RANDOMIZE))) != ((-1))" (0xffffffffffffffff, 0xffffffffffffffff) (tid=42964)
FAIL univalue/test/object (exit status: 139)
FAIL: qt/test/test_bitcoin-qt
=============================
ThreadSanitizer: CHECK failed: tsan_platform_linux.cpp:282 "((personality(old_personality | ADDR_NO_RANDOMIZE))) != ((-1))" (0xffffffffffffffff, 0xffffffffffffffff) (tid=42994)
FAIL qt/test/test_bitcoin-qt (exit status: 139)
MSAN: https://cirrus-ci.com/task/4578750543691776
unning tests: base58_tests from test/base58_tests.cpp
Running tests: base64_tests from test/base64_tests.cpp
MemorySanitizer: CHECK failed: msan_linux.cpp:192 "((personality(old_personality | ADDR_NO_RANDOMIZE))) != ((-1))" (0xffffffffffffffff, 0xffffffffffffffff) (tid=22112)
<empty stack>
make[3]: *** [Makefile:22563: test/base32_tests.cpp.test] Error 1
make[3]: *** Waiting for unfinished jobs....
MemorySanitizer: CHECK failed: msan_linux.cpp:192 "((personality(old_personality | ADDR_NO_RANDOMIZE))) != ((-1))" (0xffffffffffffffff, 0xffffffffffffffff) (tid=22137)
<empty stack>
This job was from mid July. Just in case I reproduced it against todays master: Sjors#57 / https://cirrus-ci.com/task/4886869396160512
My (limited) understanding is that the underlying issue should have been fixed and the fix has been backported to llvm 18.1.3: google/sanitizers#1614 (comment)
Ubuntu 24.04 has shipped that version since early July:https://launchpad.net/ubuntu/noble/amd64/clang-18
I can see in the CI log this this version was indeed used:
Get:123 http://archive.ubuntu.com/ubuntu noble-updates/main amd64 libllvm18 amd64 1:18.1.3-1ubuntu1 [27.5 MB]
Although I can trivially work around the issue by setting vm.mmap_rnd_bits=28, perhaps there is a deeper issue worth investigating.
Possibly related: ClickHouse/ClickHouse#64086 (they also tried 18.1.3 and 18.1.6).