Fix rust advlogger deadlock #356
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ProjectMuBot
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Nov 17, 2023
Introduces 5 new commits in [Common/MU](https://github.com/microsoft/mu_plus.git). <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/microsoft/mu_plus/commit/61f7188ab5afcbe36c687bd46fb29fead955124d">61f718</a> Inspect `mLoggerInfo` before accessing in the event callback (<a href="https://github.com/microsoft/mu_plus/pull/345">#345</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/2591f7aa3ba4f8ccaf25aad6b123a62b035be799">2591f7</a> pip: bump edk2-pytool-extensions from 0.26.0 to 0.26.2 (<a href="https://github.com/microsoft/mu_plus/pull/360">#360</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/feed5579b26049764f7eaa234d5b335ee9665c4a">feed55</a> Resolve deadlock in RustBootServicesAllocatorDxe (<a href="https://github.com/microsoft/mu_plus/pull/358">#358</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/1edf7275bd0a0c1757740a21e26e8d0ddecfc2ae">1edf72</a> Fix rust advlogger deadlock (<a href="https://github.com/microsoft/mu_plus/pull/356">#356</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/14c187b8ac4858d154612cd67a96820f78fe5584">14c187</a> Add SetProtocol command to force devices to Report Mode (<a href="https://github.com/microsoft/mu_plus/pull/361">#361</a>)</li> </ul> </details> Signed-off-by: Project Mu Bot <[email protected]>
makubacki
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Nov 18, 2023
Introduces 5 new commits in [Common/MU](https://github.com/microsoft/mu_plus.git). <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/microsoft/mu_plus/commit/feed5579b26049764f7eaa234d5b335ee9665c4a">feed55</a> Resolve deadlock in RustBootServicesAllocatorDxe (<a href="https://github.com/microsoft/mu_plus/pull/358">#358</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/1edf7275bd0a0c1757740a21e26e8d0ddecfc2ae">1edf72</a> Fix rust advlogger deadlock (<a href="https://github.com/microsoft/mu_plus/pull/356">#356</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/14c187b8ac4858d154612cd67a96820f78fe5584">14c187</a> Add SetProtocol command to force devices to Report Mode (<a href="https://github.com/microsoft/mu_plus/pull/361">#361</a>)</li> </ul> </details> Signed-off-by: Project Mu Bot <[email protected]>
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## Description This PR resolves an issue where invocation of the debugln!() macro could result in deadlock due to contention between two different TPL levels. The deadlock occurs in the following scenario: 1. A task running at a lower TPL invokes debugln!() and acquires the spinlock on the logger object. 2. That task is interrupted by a TPL running at a higher level (the lower task has not released the lock). 3. The higher TPL invokes debugln!(). In this scenario, the higher TPL task cannot make forward progress because it cannot acquire the lock held by the lower TPL task, and the lower TPL task is not executing because it was interrupted by the higher TPL task. This resolves the issue by changing the "lock" to a "try_lock" - in the scenario above, this allows the higher TPL task to make forward progress. This has the downside of dropping the message from the higher TPL task; so this is only intended as an interim fix. - [ ] Impacts functionality? - [ ] Impacts security? - [ ] Breaking change? - [ ] Includes tests? - [ ] Includes documentation? ## How This Was Tested Reproduced the issue using QEMU emulator; with this change the above flow no longer deadlocks. ## Integration Instructions N/A
kenlautner
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Dec 20, 2023
## Description This PR resolves an issue where invocation of the debugln!() macro could result in deadlock due to contention between two different TPL levels. The deadlock occurs in the following scenario: 1. A task running at a lower TPL invokes debugln!() and acquires the spinlock on the logger object. 2. That task is interrupted by a TPL running at a higher level (the lower task has not released the lock). 3. The higher TPL invokes debugln!(). In this scenario, the higher TPL task cannot make forward progress because it cannot acquire the lock held by the lower TPL task, and the lower TPL task is not executing because it was interrupted by the higher TPL task. This resolves the issue by changing the "lock" to a "try_lock" - in the scenario above, this allows the higher TPL task to make forward progress. This has the downside of dropping the message from the higher TPL task; so this is only intended as an interim fix. - [ ] Impacts functionality? - [ ] Impacts security? - [ ] Breaking change? - [ ] Includes tests? - [ ] Includes documentation? ## How This Was Tested Reproduced the issue using QEMU emulator; with this change the above flow no longer deadlocks. ## Integration Instructions N/A
ProjectMuBot
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Feb 6, 2024
Introduces 84 new commits in [Common/MU](https://github.com/microsoft/mu_plus.git). <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/microsoft/mu_plus/commit/aee3120915d9811fecb6f8f86f3c1e97adf57ed6">aee312</a> Update readme for the 202308 release</li> <li><a href="https://github.com/microsoft/mu_plus/commit/0e9ec1e6e2c06c0c0e9730869dd0c667df889b87">0e9ec1</a> Updated override for DisplayEngineDxe.inf</li> <li><a href="https://github.com/microsoft/mu_plus/commit/c8771a2f1d74d772faade363e6895d4aa981e26d">c8771a</a> Updated Readme to include changes made since the last release</li> <li><a href="https://github.com/microsoft/mu_plus/commit/22cf122e60c409a035a89fd9bc2fc54fb2f3fd2a">22cf12</a> TEMP COMMIT: use test branches for submodules</li> <li><a href="https://github.com/microsoft/mu_plus/commit/8f57057e10ac45110328f04a35eb03b77f4d31be">8f5705</a> Add HiiKeyboardLayout crate to support UEFI HII Keyboard Layouts (<a href="https://github.com/microsoft/mu_plus/pull/342">#342</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/d881e0bafc2b8360a3a2c20b2d9ed22a1422d366">d881e0</a> TpmTestingPkg: Add InputChannelLib (<a href="https://github.com/microsoft/mu_plus/pull/352">#352</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/1114f7d8fecad3353ab74613e7120f32176df446">1114f7</a> Repo File Sync: MuDevOpsWrapper.yml - Add code coverage calculation parameter (<a href="https://github.com/microsoft/mu_plus/pull/349">#349</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/dd3fde8efe4ac5c6b2f40e5c21101bb98b00016d">dd3fde</a> AdvLoggerPkg: Add PanicLib instance (<a href="https://github.com/microsoft/mu_plus/pull/348">#348</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/f4a54346dff7ec10234b580239f2d5dca3f9db61">f4a543</a> Add HID Keyboard support to UefiHidDxe (<a href="https://github.com/microsoft/mu_plus/pull/347">#347</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/610c0c1b167054db6366d1494a8098ac70772b4c">610c0c</a> Add log retrieval info to main readme (<a href="https://github.com/microsoft/mu_plus/pull/355">#355</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/9c591f3251ad34f4f7074796609b4b26d0fdcab0">9c591f</a> Repo File Sync: Update to Mu DevOps 7.2.0 (<a href="https://github.com/microsoft/mu_plus/pull/357">#357</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/59b8047e9036a352a88fc0d02e7113d2beba6f7d">59b804</a> Fixed logic related to DxeCore only advanced logger (<a href="https://github.com/microsoft/mu_plus/pull/359">#359</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/825d5ef66ca5008f5c39859c49a2176a75d59fe7">825d5e</a> Inspect `mLoggerInfo` before accessing in the event callback (<a href="https://github.com/microsoft/mu_plus/pull/345">#345</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/e0982bb83fe14127000cffdb2d5ee47a396b4311">e0982b</a> Resolve deadlock in RustBootServicesAllocatorDxe (<a href="https://github.com/microsoft/mu_plus/pull/358">#358</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/da5b6b2779722335e0010681f43c30e22083ca5b">da5b6b</a> Fix rust advlogger deadlock (<a href="https://github.com/microsoft/mu_plus/pull/356">#356</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/641bdd79a00e78f77a71104400f9871ef5677bc5">641bdd</a> Add SetProtocol command to force devices to Report Mode (<a href="https://github.com/microsoft/mu_plus/pull/361">#361</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/29de4df8a957f6da4a5f86c838111e566892bbb0">29de4d</a> GitHub Action: Bump actions/github-script from 6 to 7 (<a href="https://github.com/microsoft/mu_plus/pull/364">#364</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/51de1edca89895a4f1c27c794da8364905cd3f72">51de1e</a> Integration steps for [email protected]</li> <li><a href="https://github.com/microsoft/mu_plus/commit/641b6a9ab44398b00ade162fa154fe951afe0d88">641b6a</a> Repo File Sync: synced file(s) with microsoft/mu_devops</li> <li><a href="https://github.com/microsoft/mu_plus/commit/04025428304728493a5befbacfdcbc1de482ea3f">040254</a> Use New Stack Cookie Library (<a href="https://github.com/microsoft/mu_plus/pull/367">#367</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/ab13309c02b2eea7e71a6b6951241e37b3efe6aa">ab1330</a> Repo File Sync: synced file(s) with microsoft/mu_devops (<a href="https://github.com/microsoft/mu_plus/pull/369">#369</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/4614581b5b32374867cf759f3aaef15303d37c51">461458</a> Add Unaccepted Memory Type to Memory Protection Test App (<a href="https://github.com/microsoft/mu_plus/pull/371">#371</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/eb29cd2dfd96dd7cb7808b61d5daf0bb6326c5f9">eb29cd</a> TpmReplay: Add crypto agile log format support</li> <li><a href="https://github.com/microsoft/mu_plus/commit/8a91507cbdfba96e769375544284ca41ac7ddf04">8a9150</a> TpmReplay: Add UEFI variable decode support</li> <li><a href="https://github.com/microsoft/mu_plus/commit/d614e5b60dc2abdc0bc57fffa17ff18c6f77d4a2">d614e5</a> TpmTestingPkg/tcg_platform.py: Add SHA1 support</li> <li><a href="https://github.com/microsoft/mu_plus/commit/43c02644eda1bd22e6f78d7cc07ad8d6fd27720f">43c026</a> TpmReplay: Use a local logger</li> <li><a href="https://github.com/microsoft/mu_plus/commit/a58a7370aa00f5fa996417130c32d2e820cd3bb8">a58a73</a> TpmReplay: Add variable data hex view to log</li> <li><a href="https://github.com/microsoft/mu_plus/commit/f4a32ae462439d3823250948ea8660558efc9723">f4a32a</a> TpmTestingPkg/TpmReplayPei/Readme.md: Add new log and variable details</li> <li><a href="https://github.com/microsoft/mu_plus/commit/132d3583f7738fc4c15f884f4c1488614174f4cf">132d35</a> Remove locks from RustAdvancedLoggerDxe</li> <li><a href="https://github.com/microsoft/mu_plus/commit/0c369c29dbca0ec60f9907ea2fe4af60084a62c0">0c369c</a> Add function!() macro that yields current function name</li> <li><a href="https://github.com/microsoft/mu_plus/commit/7e7fd4084626134bf4c5b2aa0c9e98e073093347">7e7fd4</a> Add 'std' feature to RustAdvancedLoggerDxe which enables use of std::println instead of AdvLoggerProtocol - useful for test environments.</li> <li><a href="https://github.com/microsoft/mu_plus/commit/c209c243f2b40990c91c10df3ae4a270736ab17b">c209c2</a> Create separate FrameBufferMemDrawLib inf for PEI and DXE (<a href="https://github.com/microsoft/mu_plus/pull/373">#373</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/6876d73890b39bab36d7e92d7b3cc758c81cf93a">6876d7</a> MemoryProtectionTestApp: Separate Reset Method Init to Arch Specific Files (<a href="https://github.com/microsoft/mu_plus/pull/376">#376</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/ff8f8d35b36bbe4569c391033c7b110c5cc1c43d">ff8f8d</a> MsCorePkg/SecureBootKeyStoreLib: Add Library implementation (<a href="https://github.com/microsoft/mu_plus/pull/377">#377</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/a9a60670433c82635d8cd0841aed995fcee1454b">a9a606</a> pip: update to latest</li> <li><a href="https://github.com/microsoft/mu_plus/commit/2967422499962f355db17e2ba73d81694fc34439">296742</a> Minor debug print updates for DxePagingAuditTestApp (<a href="https://github.com/microsoft/mu_plus/pull/382">#382</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/ce3708db055619fdc4ca870773ef3d84d4b60a67">ce3708</a> DxePagingAudit: Update MemoryOutsideEfiMemoryMapIsInaccessible Test (<a href="https://github.com/microsoft/mu_plus/pull/381">#381</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/81cb602b3389821ea868d4e316c3f2d7d4853001">81cb60</a> GitHub Action: Bump actions/setup-python from 4 to 5 (<a href="https://github.com/microsoft/mu_plus/pull/383">#383</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/1c47d4a9aa60ddc690ba48dcdf5c8c087a494d67">1c47d4</a> Adding policy check for advanced file logger (<a href="https://github.com/microsoft/mu_plus/pull/384">#384</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/1c3b493b1aad8ab0b2fca5e5a4449f25059066a2">1c3b49</a> Add header guards missing in some files</li> <li><a href="https://github.com/microsoft/mu_plus/commit/ab2aa4d045b4a868cb10940193d370ab124ada4e">ab2aa4</a> MsWheaPkg/MsWheaEarlyStorageLib: Remove unused static function</li> <li><a href="https://github.com/microsoft/mu_plus/commit/7e75ea6ba6f8dc4684916f4979814fa9fc485418">7e75ea</a> MsWheaPkg/MsWheaEarlyStorageLib: Remove unsigned comparisons to zero</li> <li><a href="https://github.com/microsoft/mu_plus/commit/0e6136517ad67955a8f659ecf44f04a5a161e359">0e6136</a> MsGraphicsPkg/SimpleUIToolKit: Move array bounds check before access (<a href="https://github.com/microsoft/mu_plus/pull/386">#386</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/57a966eb9868f828c82ddd537e0cbdd542e2dabd">57a966</a> Implement a new version of UefiHidDxeV2 with significant improvements to unit test capability and general architecture. (<a href="https://github.com/microsoft/mu_plus/pull/374">#374</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/de375655dcd0bc59ddc0deee8a32d3285ba9dbc2">de3756</a> Updated CISettings.py for pipeline testing</li> <li><a href="https://github.com/microsoft/mu_plus/commit/e7665f1338708daf51e7d9e5a90d50edde959daa">e7665f</a> Update readme for the 202311 release</li> <li><a href="https://github.com/microsoft/mu_plus/commit/d084bbafe43dc7acf4c016dfafaba73f5932fa86">d084bb</a> Added patch notes for the release</li> <li><a href="https://github.com/microsoft/mu_plus/commit/345d45e3ac5b90f3bd0c7fa864645bea2a614fde">345d45</a> TEMP COMMIT: Updated submodules to point to the 2311_Staging branches</li> <li><a href="https://github.com/microsoft/mu_plus/commit/22485651a0184f889d47e838dc334730d251df44">224856</a> pip: bump edk2-pytool-library from 0.19.7 to 0.19.8 (<a href="https://github.com/microsoft/mu_plus/pull/391">#391</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/14e3a7e8063241c1c3f10eec405f4ebfd4545605">14e3a7</a> Rust Dependency: Update mockall requirement from 0.11.4 to 0.12.0 (<a href="https://github.com/microsoft/mu_plus/pull/392">#392</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/3876161653b33dd3f63c41f87a3fd66f186b454f">387616</a> Repo File Sync: Update GitHub actions in CodeQL workflow (<a href="https://github.com/microsoft/mu_plus/pull/396">#396</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/cb0bfb00f8253d112d2b27f50d76080209fe26b5">cb0bfb</a> pip: bump edk2-pytool-extensions from 0.26.3 to 0.26.4 (<a href="https://github.com/microsoft/mu_plus/pull/397">#397</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/4da1abcbcb73d9f0c7563fb94bf999643ec57573">4da1ab</a> Add PeiCore method to find AdvancedLogger log buffer if LoggerInfo is… (<a href="https://github.com/microsoft/mu_plus/pull/389">#389</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/e226d27cc6b7fb962b59bdf4eb9390b9e628d6c3">e226d2</a> pip: bump regex from 2023.10.3 to 2023.12.25 (<a href="https://github.com/microsoft/mu_plus/pull/398">#398</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/74cbde47afda456bc6f00f4ca4aa1f7134365dd4">74cbde</a> DxePagingAudit: Always Write Out All Files</li> <li><a href="https://github.com/microsoft/mu_plus/commit/1552e199f61be38c9d6deaeb6db4eebec889be94">1552e1</a> FlatPageTableLib: Add a Dump Table Function</li> <li><a href="https://github.com/microsoft/mu_plus/commit/c2c460f6ff53c3ffacb7892f925e620ed8f8b2fd">c2c460</a> FlatPageTableLib: Update GetRegionAccessAttributes()</li> <li><a href="https://github.com/microsoft/mu_plus/commit/27c1a73333926e1945728f33588c82f5d9822e9b">27c1a7</a> DxePagingAudit: Pre-allocate Memory For Maps in Shell Tests</li> <li><a href="https://github.com/microsoft/mu_plus/commit/7cf6eb4ecf3d424690586ae05b07e8d5da33455c">7cf6eb</a> DxePagingAudit: Add Function to Check Attributes Using GetRegionAccessAttributes()</li> <li><a href="https://github.com/microsoft/mu_plus/commit/61974f87fe0bc4962886b6e123687fe4da1c2967">61974f</a> DxePagingAudit: Update Shell Tests to Use the Validate Function</li> <li><a href="https://github.com/microsoft/mu_plus/commit/674ed4681057ab28be96616500eacb34bc4a9514">674ed4</a> Rust Dependency: Update scroll requirement from 0.11 to 0.12 (<a href="https://github.com/microsoft/mu_plus/pull/399">#399</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/13f2350370490831dd5750f8e49b8384bd2ee117">13f235</a> DxePagingAudit: Skip Stack Publishing if Stack Info Isn't Valid (<a href="https://github.com/microsoft/mu_plus/pull/400">#400</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/1fe0ab702995ff2885cdd67d238475f925414e13">1fe0ab</a> Fix DxePagingAuditTestApp Typo, Update FlatPageTableLib AARCH64 IsPageReadable() Check (<a href="https://github.com/microsoft/mu_plus/pull/402">#402</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/ad7b45a1ba9a56d710d02a7bc5b00377dd9a901b">ad7b45</a> Remove Pre-Split MemoryProtectionTestApp Files (<a href="https://github.com/microsoft/mu_plus/pull/405">#405</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/a19c8f19441370bff59cb6c5aae071ed7e0c2550">a19c8f</a> Add prefix for advanced logger memory message entries (<a href="https://github.com/microsoft/mu_plus/pull/388">#388</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/af59b6c082b9b4ebac0f96543c3aeaa0e449bde5">af59b6</a> .git-blame-ignore-revs: Ignore Line Ending and Uncrustify only commits (<a href="https://github.com/microsoft/mu_plus/pull/404">#404</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/2841d8e1c2a5eec55c696c0817ada2d64e8aab3e">2841d8</a> Fixing uninitialized variable build error (<a href="https://github.com/microsoft/mu_plus/pull/406">#406</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/41000b344e143d1dfbdbd1912f41497bf9608d31">41000b</a> pip: bump edk2-pytool-library from 0.19.8 to 0.19.9 (<a href="https://github.com/microsoft/mu_plus/pull/407">#407</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/de28d44946778394c9004aa2235ac01bd604d34c">de28d4</a> Wrap advanced logger buffer cursor when the logging area is full (<a href="https://github.com/microsoft/mu_plus/pull/408">#408</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/345c05818db7b8d27273043b22075e972c3751dd">345c05</a> Updated submodule branches to release 202311 and made compatibility changes associated with that</li> <li><a href="https://github.com/microsoft/mu_plus/commit/5d2471f48f6a638601c1cb9a105f650ce8cb928d">5d2471</a> Removed references to libraries that no longer exist</li> <li><a href="https://github.com/microsoft/mu_plus/commit/b39e5ccd5a72ce34cc7892edc99e3c9479baa898">b39e5c</a> Updated CISettings.py to use the edk2toolext codeql helpers (<a href="https://github.com/microsoft/mu_plus/pull/414">#414</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/6d5e0c5ff29037bbd02f20ccc37e4a25c4b5e806">6d5e0c</a> Add call to HdwPortInitialize() when instantiating logger in DXE (<a href="https://github.com/microsoft/mu_plus/pull/411">#411</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/3c47b5f8e2f2bce5533fe446be011938445103db">3c47b5</a> Fixing Advanced logger wrapping unit test (<a href="https://github.com/microsoft/mu_plus/pull/417">#417</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/d567b5e74c50c5fa814722e703174c55a5c285fb">d567b5</a> Adding a more adapt python tooling for Advanced Logger v4 (<a href="https://github.com/microsoft/mu_plus/pull/415">#415</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/5e8ac1d37eb330cebef1c5b8f2f0fcd9a4a74738">5e8ac1</a> Repo File Sync: Add Cargo features to Makefile.toml (<a href="https://github.com/microsoft/mu_plus/pull/409">#409</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/bd05d55d9c2d6dc6b057f795a27f67d1c0bfc0c4">bd05d5</a> AdvLoggerPkg: 64-bit SEC & PEI C Code changes</li> <li><a href="https://github.com/microsoft/mu_plus/commit/6d7c66583426a3b7d0978cb4e1e38ec92ce1561d">6d7c66</a> AdvLoggerPkg/SecDebugAgent: Update for 64-bit</li> <li><a href="https://github.com/microsoft/mu_plus/commit/cf46ce4a55be2ca552c1cc29743635d1edd243dd">cf46ce</a> GitHub Action: Bump actions/cache from 3 to 4 (<a href="https://github.com/microsoft/mu_plus/pull/412">#412</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/cd90897ac68d593c387800aebda9492e26f93519">cd9089</a> Update pip-requirements.txt (<a href="https://github.com/microsoft/mu_plus/pull/421">#421</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/2ea56de87830b3d8f280432c3461b4508f62a39e">2ea56d</a> GitHub Action: Bump robinraju/release-downloader from 1.8 to 1.9 (<a href="https://github.com/microsoft/mu_plus/pull/425">#425</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/1b10bac37eeb213ff99978bc051ed8b73608a014">1b10ba</a> Repo File Sync: synced file(s) with microsoft/mu_devops (<a href="https://github.com/microsoft/mu_plus/pull/427">#427</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/a3d2d5b54c1ad16215ed3b137cdb27618cda0f86">a3d2d5</a> pip: bump edk2-pytool-extensions from 0.27.0 to 0.27.2 (<a href="https://github.com/microsoft/mu_plus/pull/429">#429</a>)</li> <li><a href="https://github.com/microsoft/mu_plus/commit/c9d74b38897beb2993235ee14ef7fa86038c5e1d">c9d74b</a> Repo File Sync: 202311 Branch Transition Updates (<a href="https://github.com/microsoft/mu_plus/pull/430">#430</a>)</li> </ul> </details> Signed-off-by: Project Mu Bot <[email protected]>
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Description
This PR resolves an issue where invocation of the debugln!() macro could result in deadlock due to contention between two different TPL levels. The deadlock occurs in the following scenario:
In this scenario, the higher TPL task cannot make forward progress because it cannot acquire the lock held by the lower TPL task, and the lower TPL task is not executing because it was interrupted by the higher TPL task.
This resolves the issue by changing the "lock" to a "try_lock" - in the scenario above, this allows the higher TPL task to make forward progress. This has the downside of dropping the message from the higher TPL task; so this is only intended as an interim fix.
How This Was Tested
Reproduced the issue using QEMU emulator; with this change the above flow no longer deadlocks.
Integration Instructions
N/A