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Live: Crash for invalid live stream state when unmount HTTP. v6.0.146 v7.0.3 (#4141)

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When unpublishing, the handler callback that will stop the coroutine:

```cpp
_can_publish = true;
handler->on_unpublish(req);
```

In this handler, the `http_unmount` will be called:

```cpp
void SrsHttpStreamServer::http_unmount(SrsRequest* r)
    cache->stop();
```

In this `http_unmount` function, there could be context switching. In
such a situation, a new connection might publish the stream while the
unpublish process is freeing the stream, leading to a crash.

To prevent a new publisher, we should change the state only after all
handlers and hooks are completed.

---------

Co-authored-by: liumengte <liumengte@visionular.com>
Co-authored-by: winlin <winlinvip@gmail.com>
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trunk/doc/CHANGELOG.md
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@ -7,6 +7,7 @@ The changelog for SRS.
<a name="v7-changes"></a>
## SRS 7.0 Changelog
* v7.0, 2024-08-14, Merge [#4141](https://github.com/ossrs/srs/pull/4141): Live: Crash for invalid live stream state when unmount HTTP. v7.0.3 (#4141)
* v7.0, 2024-08-13, Merge [#4092](https://github.com/ossrs/srs/pull/4092): Config: Improve env config to support multi values. v7.0.2 (#4092)
* v7.0, 2024-08-12, Merge [#4131](https://github.com/ossrs/srs/pull/4131): Transcode: More generic h264/h265 codec support. v7.0.1 (#4131)
* v7.0, 2024-08-12, Init SRS 7 branch. v7.0.0
@ -14,6 +15,7 @@ The changelog for SRS.
<a name="v6-changes"></a>
## SRS 6.0 Changelog
* v6.0, 2024-08-14, Merge [#4141](https://github.com/ossrs/srs/pull/4141): Live: Crash for invalid live stream state when unmount HTTP. v6.0.146 (#4141)
* v6.0, 2024-07-27, Merge [#4127](https://github.com/ossrs/srs/pull/4127): Transcode: Support video codec such as h264_qsv and libx265. v6.0.145 (#4127)
* v6.0, 2024-07-27, Merge [#4101](https://github.com/ossrs/srs/pull/4101): GB28181: Support external SIP server. v6.0.144 (#4101)
* v6.0, 2024-07-24, Merge [#4115](https://github.com/ossrs/srs/pull/4115): HLS: Add missing newline to end of session manifest. v6.0.143 (#4115)