Tested with VALGRIND_3_15_0-193-gfe6805efc STEPS TO REPRODUCE 1. build wine, with https://github.com/mstorsjo/llvm-mingw/ and enable pdb symbols 2. cd ./dlls/crypt32/tests 3. make cert.ok Result: ../../../tools/runtest -q -P wine -T ../../.. -M crypt32.dll -p crypt32_test.exe cert && touch cert.ok valgrind: m_debuginfo/debuginfo.c:454 (discard_or_archive_DebugInfo): Assertion '!di->have_dinfo || is_DebugInfo_active(di)' failed. host stacktrace: ==27633== at 0x58041809: show_sched_status_wrk (m_libcassert.c:406) ==27633== by 0x58041930: report_and_quit (m_libcassert.c:477) ==27633== by 0x58041A24: vgPlain_assert_fail (m_libcassert.c:543) ==27633== by 0x58072C1B: discard_or_archive_DebugInfo (debuginfo.c:454) ==27633== by 0x58072E24: discard_syms_in_range (debuginfo.c:526) ==27633== by 0x580751C8: vgPlain_di_notify_munmap (debuginfo.c:1336) ==27633== by 0x580AEE96: vgModuleLocal_notify_core_and_tool_of_munmap (syswrap-generic.c:246) ==27633== by 0x580AEE96: vgSysWrap_generic_sys_munmap_after (syswrap-generic.c:3949) ==27633== by 0x580A2829: vgPlain_post_syscall (syswrap-main.c:2172) ==27633== by 0x580A2E42: vgPlain_client_syscall (syswrap-main.c:2093) ==27633== by 0x5809EFFC: handle_syscall (scheduler.c:1208) ==27633== by 0x580A0B5F: vgPlain_scheduler (scheduler.c:1526) ==27633== by 0x580F58F2: thread_wrapper (syswrap-linux.c:101) ==27633== by 0x580F58F2: run_a_thread_NORETURN (syswrap-linux.c:154) sched status: running_tid=1 Thread 1: status = VgTs_Runnable syscall 91 (lwpid 27633) ==27633== at 0x437A2C6: munmap (syscall-template.S:78) ==27633== by 0x7BCA7BF1: unmap_area (virtual.c:799) ==27633== by 0x7BCA7C3F: delete_view (virtual.c:836) ==27633== by 0x7BCAC4F1: NtUnmapViewOfSection (virtual.c:3409) ==27633== by 0x7BC68D7C: free_modref (loader.c:3586) ==27633== by 0x7BC68E66: MODULE_FlushModrefs (loader.c:3613) ==27633== by 0x7BC6AB0B: LdrUnloadDll (loader.c:3687) ==27633== by 0x7B013D20: ??? ==27633== by 0x4BD0B9F: CryptFreeOIDFunctionAddress (oid.c:481) ==27633== by 0x4B9E51B: CertVerifyRevocation (cert.c:2024) ==27633== by 0x40AC79: ??? ==27633== by 0x4035BF: ??? ==27633== by 0x445332: ??? ==27633== by 0x4451EC: ??? ==27633== by 0x401394: ??? ==27633== by 0x7B449E31: ??? (in /home/austin/wine-valgrind-mingw/dlls/kernel32/kernel32.dll.so) ==27633== by 0x7B44A262: start_process (process.c:153) ==27633== by 0x7B449E3D: ??? (in /home/austin/wine-valgrind-mingw/dlls/kernel32/kernel32.dll.so) client stack range: [0x4A52000 0x4B4FFFF] client SP: 0x4B4FA58 valgrind stack range: [0x8815E000 0x8825DFFF] top usage: 16748 of 1048576 Note: see also the FAQ in the source distribution. It contains workarounds to several common problems. In particular, if Valgrind aborted or crashed after identifying problems in your program, there's a good chance that fixing those problems will prevent Valgrind aborting or crashing, especially if it happened in m_mallocfree.c. If that doesn't help, please report this bug to: www.valgrind.org In the bug report, send all the above text, the valgrind version, and what OS and version you are using. Thanks. make[1]: *** [Makefile:234: cert.ok] Error 1 Expected result: Assertion doesn't fail austin@laptop ~/wine-valgrind/dlls/crypt32/tests (master) $ file *pdb crypt32_test.pdb: MSVC program database ver 7.00, 4096*194 bytes Note that this occurs for many, but not all, tests. Out of the first 176 tests (I had to stop for unrelated reasons), 41 tests showed this failure.