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From: "rjones at redhat dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug go/114699] New: gcc-go -buildmode=c-shared doesn't use -Wl,-z,nodelete so libraries crash when dlclosed Date: Thu, 11 Apr 2024 21:41:14 +0000 [thread overview] Message-ID: <bug-114699-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114699 Bug ID: 114699 Summary: gcc-go -buildmode=c-shared doesn't use -Wl,-z,nodelete so libraries crash when dlclosed Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: go Assignee: ian at airs dot com Reporter: rjones at redhat dot com Target Milestone: --- I was chasing a crash in nbdkit-golang-plugin (https://gitlab.com/nbdkit/nbdkit/-/tree/master/plugins/golang?ref_type=heads). This crash only happens with gcc-go (and quite reproducibly), but doesn't happen with golang. The crash happened when the plugin was being unloaded with dlclose(3). Long story short, this is a bug that has already been reported and "fixed" (or more accurately, worked around) in golang: https://github.com/golang/go/issues/11100 Because goroutines, the garbage collector, etc is basically running all the time in golang programs, you cannot safely remove them from memory. Any attempt to actually dlclose a golang plugin will crash most of the time when a goroutine/the GC executes some code after dlclose. golang works around this by linking shared libraries it creates with -Wl,-z,nodelete: https://github.com/golang/go/blob/1843464f014c946c1663de76249267486887626f/src/cmd/link/internal/ld/lib.go#L1587 Because gcc-go doesn't do this, the same shared libraries crash when compiled with it. Fix (or workaround) is probably to copy what golang does.
next reply other threads:[~2024-04-11 21:41 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-04-11 21:41 rjones at redhat dot com [this message] 2024-04-11 21:43 ` [Bug go/114699] " rjones at redhat dot com 2024-04-11 21:45 ` rjones at redhat dot com 2024-04-11 21:47 ` rjones at redhat dot com
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