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Ran 22 Apr 2026 07:31AM UTC

Files 37

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Committed 22 Apr 2026 07:19AM UTC coverage: 80.636% (+0.07%) from 80.565%

Job # 2107.1

Build Type

push

travis-ci

Committed by

ivmai

Commit Message

Fix deadlock in GC_start_mark_threads if redirect-malloc on Linux

Issue #909 (bdwgc).

In `GC_start_mark_threads_inner`, real `pthread_create()` could call
our `calloc()` redirecting to `GC_generic_malloc_uncollectable()`,
thus we should release the allocator lock temporarily (to avoid
a deadlock).  As a consequence, we need to prevent usage of the
markers till `GC_wait_for_markers_init()` completion - the easiest
way to achieve this is to disable collection temporarily.

* pthread_support.c [GC_PTHREADS_PARAMARK]
(GC_start_mark_threads_inner): Update comments for `if (GC_parallel)`
and `INIT_REAL_SYMS()`; define `res` local variable.
* pthread_support.c [GC_PTHREADS_PARAMARK && REDIRECT_MALLOC]
(GC_start_mark_threads_inner): Call `GC_disable_inner()` and `UNLOCK()`
before call `REAL_FUNC(pthread_create)()`, followed by call `LOCK()`
and `GC_enable_inner()`; add comment.

Co-authored-by: fcrwr <262846459+fcrwr@users.noreply.github.com>

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7229 of 8965 relevant lines covered (80.64%)

18665721.63 hits per line

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master: 81%

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