https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212639
Bug ID: 212639
Summary: kernel/386: i386_set_ldt/i386_ldt_grow run out of LDT,
because M_ZERO missing in user_ldt_alloc?
Product: Base System
Version: CURRENT
Hardware: i386
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: wheelcomp...@gmail.com
CC: freebsd-i...@freebsd.org
CC: freebsd-i...@freebsd.org
Go compiler crash with "signal: trace/BPT trap" when running testing
concurrently(and lead to heavy load).
Core-dump and kernel debug log telling that it is trigger by
i386_set_ldt/i386_ldt_grow run out of LDT.
Fix by change kmem_malloc flags from "M_WAITOK" to "M_WAITOK | M_ZERO" in
user_ldt_alloc
(https://github.com/freebsd/freebsd/blob/master/sys/i386/i386/sys_machdep.c#L441)
More detail:
https://github.com/golang/go/issues/16950
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