Fix deadlock between snatchable_lock and trackers in Queue::write_texture (#7004)

* Fix deadlock between snatchable_lock and trackers in Queue::write_texture

* Fix another deadlock in write_texture between pending_writes and snatchable_lock.

Author: metamuffin

CHANGELOG.md

@@ -75,6 +75,7 @@ By @brodycj in [#6924](https://github.com/gfx-rs/wgpu/pull/6924).
 - Fix `wgpu` not building with `--no-default-features` on when targeting `wasm32-unknown-unknown`. By @wumpf in [#6946](https://github.com/gfx-rs/wgpu/pull/6946).
 - Fix `CopyExternalImageDestInfo` not exported on `wgpu`. By @wumpf in [#6962](https://github.com/gfx-rs/wgpu/pull/6962).
 - Fix drop order in `Surface`. By @ed-2100 in [#6997](https://github.com/gfx-rs/wgpu/pull/6997)
+- Fix a possible deadlock within `Queue::write_texture`. By @metamuffin in [#7004](https://github.com/gfx-rs/wgpu/pull/7004)
 
 #### Vulkan
 

wgpu-core/src/device/queue.rs

@@ -697,6 +697,8 @@ impl Queue {
                 .map_err(TransferError::from)?;
         }
 
+        let snatch_guard = self.device.snatchable_lock.read();
+
         let mut pending_writes = self.pending_writes.lock();
         let encoder = pending_writes.activate();
 
@@ -732,7 +734,7 @@ impl Queue {
                         &mut trackers.textures,
                         &self.device.alignments,
                         self.device.zero_buffer.as_ref(),
-                        &self.device.snatchable_lock.read(),
+                        &snatch_guard,
                     )
                     .map_err(QueueWriteError::from)?;
                 }
@@ -742,8 +744,6 @@ impl Queue {
             }
         }
 
-        let snatch_guard = self.device.snatchable_lock.read();
-
         let dst_raw = dst.try_raw(&snatch_guard)?;
 
         let (block_width, block_height) = dst.desc.format.block_dimensions();