https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259076
Bug ID: 259076
Summary: pthread_mutex_init fails with limited AS
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: misc
Assignee: b...@freebsd.org
Reporter: dynamic-w...@mail.ru
A complex application run in limited address space eventually fails to allocate
a mutex.
pthread_mutex_init normally calls __thr_calloc which calls __crt_calloc in
rtld-malloc.c. When out of memory __crt_calloc calls morecore, which always
adds NPOOLPAGES (128K) to the requested size (circa 128 bytes for a mutex).
This way pthread_mutex_init and others will eventually fail when the address
space is both limited and fragmented.
A simple fix will be to retry morepages(amt/pagesz) every time
morepages(amt/pagesz + NPOOLPAGES) fails.
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