dotnet/runtime Issues | Good First Issue

C# (17,886 stars) (5,445 forks) (121 indexed issues) (PR metrics pending)Last commit May 15, 2026

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Issues

121 open indexed issues

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Open

JIT: Arm `IsContainableImmed` doesnt handle shifts

area-CodeGen-coreclrhelp wantedoptimization

dotnet/runtime #125,578 opened 2 months ago · C# · 17,886 stars

2 comments0 reactions0 assignees

Open

JIT: Simplify arithmetic operations on memory, as is already done for register

area-CodeGen-coreclrhelp wantedoptimization

dotnet/runtime #125,300 opened 3 months ago · C# · 17,886 stars

1 comment0 reactions0 assignees

Open

JIT: A case of needing `JitOptRepeat=3` for constant folding and conditional move

area-CodeGen-coreclrhelp wantedoptimization

dotnet/runtime #124,700 opened 3 months ago · C# · 17,886 stars

7 comments0 reactions0 assignees

Open

Jit: Missing folding some compares in optimizebools

area-CodeGen-coreclrhelp wantedtenet-performance

dotnet/runtime #123,291 opened 4 months ago · C# · 17,886 stars

4 comments0 reactions0 assignees

Open

Subtract-variant of `VectorXXX.MultiplyAddEstimate` does not light up for negated constant local

area-CodeGen-coreclrhelp wantedtenet-performance

dotnet/runtime #121,301 opened 7 months ago · C# · 17,886 stars

4 comments0 reactions0 assignees

Open

Created System.ServiceProcess Service fail on Win Server

area-System.ServiceProcesshelp wanted

dotnet/runtime #120,163 opened 8 months ago · C# · 17,886 stars

1 comment0 reactions0 assignees

Open

Unnecessary sign-extension for `LeadingZeroCount(UInt64)`

area-CodeGen-coreclrhelp wanted

dotnet/runtime #119,699 opened 8 months ago · C# · 17,886 stars

12 comments1 reaction0 assignees

Open

Unnecessary sign-extension for some never-negative expressions

area-CodeGen-coreclrhelp wanted

dotnet/runtime #119,680 opened 9 months ago · C# · 17,886 stars

1 comment1 reaction0 assignees

Open

CSE seems to fail when writing `x / cns` and `x % cns` for unsigned integers

area-CodeGen-coreclrhelp wantedtenet-performance

dotnet/runtime #119,131 opened 9 months ago · C# · 17,886 stars

2 comments2 reactions0 assignees

Open

Unhandled exception thrown by System.Speech when using it with SAPIForVOICEVOX

area-System.Speechhelp wantedneeds-further-triage

dotnet/runtime #118,819 opened 9 months ago · C# · 17,886 stars

2 comments0 reactions0 assignees

Open

File.ResolveLinkTarget(String, Boolean) doesn't fully resolve a symbolic link created by Kubernetes volume mounts to its full path

area-System.IOhelp wantedos-linux

dotnet/runtime #118,719 opened 9 months ago · C# · 17,886 stars

2 comments0 reactions0 assignees

Open

`(x >> N) << N` should reduce to a mask

area-CodeGen-coreclrhelp wantedtenet-performance

dotnet/runtime #118,643 opened 10 months ago · C# · 17,886 stars

3 comments1 reaction0 assignees

Open

Gigantic memory usage when using the SerialPort class under Citrix (but could happen everywhere else)

area-System.IO.Portshelp wantedneeds-further-triage

dotnet/runtime #118,485 opened 10 months ago · C# · 17,886 stars

1 comment0 reactions0 assignees

Open

TakeLast Performance Improvement suggestion

area-System.Linqhelp wantedtenet-performance

dotnet/runtime #118,312 opened 10 months ago · C# · 17,886 stars

3 comments0 reactions0 assignees

Open

ILGenerator imposes artificial limitations on otherwise valid IL

area-System.Reflection.Emithelp wanted

dotnet/runtime #118,238 opened 10 months ago · C# · 17,886 stars

6 comments0 reactions0 assignees

Open

Excessive exceptions in NamedPipeClientStream on Linux when connecting to a non-existent target

area-System.IOhelp wanted

dotnet/runtime #117,718 opened 10 months ago · C# · 17,886 stars

1 comment0 reactions0 assignees

Open

Suboptimal codgen for `Vector128.NarrowWithSaturation`

area-CodeGen-coreclrhelp wanted

dotnet/runtime #116,526 opened last year · C# · 17,886 stars

8 comments1 reaction0 assignees

Open

[Android] Implement post-build symbol stripping

area-Infrastructuregood first issueos-android

dotnet/runtime #115,717 opened last year · C# · 17,886 stars

3 comments0 reactions1 assignee

Open

`System.IO.EnumerationOptions.MatchCasing` is potentially misleading

area-System.IOdocumentationhelp wanted

dotnet/runtime #115,356 opened last year · C# · 17,886 stars

2 comments0 reactions0 assignees

Open

Could not load file or assembly 'System.Security.Principal.Windows, Version=4.1.1.0

area-System.Runtimehelp wantedneeds-further-triage

dotnet/runtime #115,326 opened last year · C# · 17,886 stars

3 comments0 reactions0 assignees

C# (17,886 stars) (5,445 forks) (121 indexed issues) (PR metrics pending)Last commit May 15, 2026

Issues

121 open indexed issues

RSS Atom

Open

JIT: Arm `IsContainableImmed` doesnt handle shifts

area-CodeGen-coreclrhelp wantedoptimization

dotnet/runtime #125,578 opened 2 months ago · C# · 17,886 stars

2 comments0 reactions0 assignees

Open

JIT: Simplify arithmetic operations on memory, as is already done for register

area-CodeGen-coreclrhelp wantedoptimization

dotnet/runtime #125,300 opened 3 months ago · C# · 17,886 stars

1 comment0 reactions0 assignees

Open

JIT: A case of needing `JitOptRepeat=3` for constant folding and conditional move

area-CodeGen-coreclrhelp wantedoptimization

dotnet/runtime #124,700 opened 3 months ago · C# · 17,886 stars

7 comments0 reactions0 assignees

Open

Jit: Missing folding some compares in optimizebools

area-CodeGen-coreclrhelp wantedtenet-performance

dotnet/runtime #123,291 opened 4 months ago · C# · 17,886 stars

4 comments0 reactions0 assignees

Open

Subtract-variant of `VectorXXX.MultiplyAddEstimate` does not light up for negated constant local

area-CodeGen-coreclrhelp wantedtenet-performance

dotnet/runtime #121,301 opened 7 months ago · C# · 17,886 stars

4 comments0 reactions0 assignees

Open

Created System.ServiceProcess Service fail on Win Server

area-System.ServiceProcesshelp wanted

dotnet/runtime #120,163 opened 8 months ago · C# · 17,886 stars

1 comment0 reactions0 assignees

Open

Unnecessary sign-extension for `LeadingZeroCount(UInt64)`

area-CodeGen-coreclrhelp wanted

dotnet/runtime #119,699 opened 8 months ago · C# · 17,886 stars

12 comments1 reaction0 assignees

Open

Unnecessary sign-extension for some never-negative expressions

area-CodeGen-coreclrhelp wanted

dotnet/runtime #119,680 opened 9 months ago · C# · 17,886 stars

1 comment1 reaction0 assignees

Open

CSE seems to fail when writing `x / cns` and `x % cns` for unsigned integers

area-CodeGen-coreclrhelp wantedtenet-performance

dotnet/runtime #119,131 opened 9 months ago · C# · 17,886 stars

2 comments2 reactions0 assignees

Open

Unhandled exception thrown by System.Speech when using it with SAPIForVOICEVOX

area-System.Speechhelp wantedneeds-further-triage

dotnet/runtime #118,819 opened 9 months ago · C# · 17,886 stars

2 comments0 reactions0 assignees

Open

File.ResolveLinkTarget(String, Boolean) doesn't fully resolve a symbolic link created by Kubernetes volume mounts to its full path

area-System.IOhelp wantedos-linux

dotnet/runtime #118,719 opened 9 months ago · C# · 17,886 stars

2 comments0 reactions0 assignees

Open

`(x >> N) << N` should reduce to a mask

area-CodeGen-coreclrhelp wantedtenet-performance

dotnet/runtime #118,643 opened 10 months ago · C# · 17,886 stars

3 comments1 reaction0 assignees

Open

Gigantic memory usage when using the SerialPort class under Citrix (but could happen everywhere else)

area-System.IO.Portshelp wantedneeds-further-triage

dotnet/runtime #118,485 opened 10 months ago · C# · 17,886 stars

1 comment0 reactions0 assignees

Open

TakeLast Performance Improvement suggestion

area-System.Linqhelp wantedtenet-performance

dotnet/runtime #118,312 opened 10 months ago · C# · 17,886 stars

3 comments0 reactions0 assignees

Open

ILGenerator imposes artificial limitations on otherwise valid IL

area-System.Reflection.Emithelp wanted

dotnet/runtime #118,238 opened 10 months ago · C# · 17,886 stars

6 comments0 reactions0 assignees

Open

Excessive exceptions in NamedPipeClientStream on Linux when connecting to a non-existent target

area-System.IOhelp wanted

dotnet/runtime #117,718 opened 10 months ago · C# · 17,886 stars

1 comment0 reactions0 assignees

Open

Suboptimal codgen for `Vector128.NarrowWithSaturation`

area-CodeGen-coreclrhelp wanted

dotnet/runtime #116,526 opened last year · C# · 17,886 stars

8 comments1 reaction0 assignees

Open

[Android] Implement post-build symbol stripping

area-Infrastructuregood first issueos-android

dotnet/runtime #115,717 opened last year · C# · 17,886 stars

3 comments0 reactions1 assignee

Open

`System.IO.EnumerationOptions.MatchCasing` is potentially misleading

area-System.IOdocumentationhelp wanted

dotnet/runtime #115,356 opened last year · C# · 17,886 stars

2 comments0 reactions0 assignees

Open

Could not load file or assembly 'System.Security.Principal.Windows, Version=4.1.1.0

area-System.Runtimehelp wantedneeds-further-triage

dotnet/runtime #115,326 opened last year · C# · 17,886 stars

3 comments0 reactions0 assignees

C# (17,886 stars) (5,445 forks) (121 indexed issues) (PR metrics pending)Last commit May 15, 2026

Loading repository issues...

Issues

121 open indexed issues

RSS Atom

Open

JIT: Arm `IsContainableImmed` doesnt handle shifts

area-CodeGen-coreclrhelp wantedoptimization

dotnet/runtime #125,578 opened 2 months ago · C# · 17,886 stars

2 comments0 reactions0 assignees

Open

JIT: Simplify arithmetic operations on memory, as is already done for register

area-CodeGen-coreclrhelp wantedoptimization

dotnet/runtime #125,300 opened 3 months ago · C# · 17,886 stars

1 comment0 reactions0 assignees

Open

JIT: A case of needing `JitOptRepeat=3` for constant folding and conditional move

area-CodeGen-coreclrhelp wantedoptimization

dotnet/runtime #124,700 opened 3 months ago · C# · 17,886 stars

7 comments0 reactions0 assignees

Open

Jit: Missing folding some compares in optimizebools

area-CodeGen-coreclrhelp wantedtenet-performance

dotnet/runtime #123,291 opened 4 months ago · C# · 17,886 stars

4 comments0 reactions0 assignees

Open

Subtract-variant of `VectorXXX.MultiplyAddEstimate` does not light up for negated constant local

area-CodeGen-coreclrhelp wantedtenet-performance

dotnet/runtime #121,301 opened 7 months ago · C# · 17,886 stars

4 comments0 reactions0 assignees

Open

Created System.ServiceProcess Service fail on Win Server

area-System.ServiceProcesshelp wanted

dotnet/runtime #120,163 opened 8 months ago · C# · 17,886 stars

1 comment0 reactions0 assignees

Open

Unnecessary sign-extension for `LeadingZeroCount(UInt64)`

area-CodeGen-coreclrhelp wanted

dotnet/runtime #119,699 opened 8 months ago · C# · 17,886 stars

12 comments1 reaction0 assignees

Open

Unnecessary sign-extension for some never-negative expressions

area-CodeGen-coreclrhelp wanted

dotnet/runtime #119,680 opened 9 months ago · C# · 17,886 stars

1 comment1 reaction0 assignees

Open

CSE seems to fail when writing `x / cns` and `x % cns` for unsigned integers

area-CodeGen-coreclrhelp wantedtenet-performance

dotnet/runtime #119,131 opened 9 months ago · C# · 17,886 stars

2 comments2 reactions0 assignees

Open

Unhandled exception thrown by System.Speech when using it with SAPIForVOICEVOX

area-System.Speechhelp wantedneeds-further-triage

dotnet/runtime #118,819 opened 9 months ago · C# · 17,886 stars

2 comments0 reactions0 assignees

Open

File.ResolveLinkTarget(String, Boolean) doesn't fully resolve a symbolic link created by Kubernetes volume mounts to its full path

area-System.IOhelp wantedos-linux

dotnet/runtime #118,719 opened 9 months ago · C# · 17,886 stars

2 comments0 reactions0 assignees

Open

`(x >> N) << N` should reduce to a mask

area-CodeGen-coreclrhelp wantedtenet-performance

dotnet/runtime #118,643 opened 10 months ago · C# · 17,886 stars

3 comments1 reaction0 assignees

Open

Gigantic memory usage when using the SerialPort class under Citrix (but could happen everywhere else)

area-System.IO.Portshelp wantedneeds-further-triage

dotnet/runtime #118,485 opened 10 months ago · C# · 17,886 stars

1 comment0 reactions0 assignees

Open

TakeLast Performance Improvement suggestion

area-System.Linqhelp wantedtenet-performance

dotnet/runtime #118,312 opened 10 months ago · C# · 17,886 stars

3 comments0 reactions0 assignees

Open

ILGenerator imposes artificial limitations on otherwise valid IL

area-System.Reflection.Emithelp wanted

dotnet/runtime #118,238 opened 10 months ago · C# · 17,886 stars

6 comments0 reactions0 assignees

Open

Excessive exceptions in NamedPipeClientStream on Linux when connecting to a non-existent target

area-System.IOhelp wanted

dotnet/runtime #117,718 opened 10 months ago · C# · 17,886 stars

1 comment0 reactions0 assignees

Open

Suboptimal codgen for `Vector128.NarrowWithSaturation`

area-CodeGen-coreclrhelp wanted

dotnet/runtime #116,526 opened last year · C# · 17,886 stars

8 comments1 reaction0 assignees

Open

[Android] Implement post-build symbol stripping

area-Infrastructuregood first issueos-android

dotnet/runtime #115,717 opened last year · C# · 17,886 stars

3 comments0 reactions1 assignee

Open

`System.IO.EnumerationOptions.MatchCasing` is potentially misleading

area-System.IOdocumentationhelp wanted

dotnet/runtime #115,356 opened last year · C# · 17,886 stars

2 comments0 reactions0 assignees

Open

Could not load file or assembly 'System.Security.Principal.Windows, Version=4.1.1.0

area-System.Runtimehelp wantedneeds-further-triage

dotnet/runtime #115,326 opened last year · C# · 17,886 stars

3 comments0 reactions0 assignees