[Bug 109794] LLVM not properly shutdown in `si_pipe.c`?
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Thu Feb 28 06:51:08 UTC 2019
https://bugs.freedesktop.org/show_bug.cgi?id=109794
Bug ID: 109794
Summary: LLVM not properly shutdown in `si_pipe.c`?
Product: Mesa
Version: git
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: minor
Priority: medium
Component: Drivers/Gallium/radeonsi
Assignee: dri-devel at lists.freedesktop.org
Reporter: zegentzy at protonmail.com
QA Contact: dri-devel at lists.freedesktop.org
tl;dr; Shouldn't we be calling `LLVMShutdown()` somewhere?
I had a program which was calling:
```
eglInitialize(disp, &majoir, &minor);
eglTerminate(disp);
eglInitialize(disp, &majoir, &minor);
```
Which lead to mesa outputting the following before continuing on normally
during the second call to `eglInitalize`:
```
mesa: for the -simplifycfg-sink-common option: may only occur zero or one
times!
mesa: for the -global-isel-abort option: may only occur zero or one times!
```
This prompted an investigation me to investigate, and with the aid of @imirkin,
I think I got the cause.
You see, in an `eglInitialize` call `radeonsi_dri.so` gets loaded, which also
loads in `libLLVM-9svn.so`, and eventually `ac_init_llvm_once()` gets called
more than once.
That's OK, for as the name implies, it only happens once.
Issue is, when `eglTerminate` is called, `radeonsi_dri.so` gets unloaded, but
not `libLLVM-9svn.so`. This means that the next time we all `eglInitialize`,
LLVM's `ManagedStatic`s will be preserved, but not our static var
`ac_init_llvm_target_once_flag`.
We can fix this by calling `LLVMShutdown` before unloading `radeonsi_dri.so`,
that way LLVM's `ManagedStatic`s are also reset.
Alas, I'm not familiar enough with the mesa codebase, so I got no clue where
the appropriate place to plop this function is. Any aid would be well
appreciated.
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