ProcessModule.BaseAddress is sometimes incorrect on Linux

[tmds]

For example, libcoreclr.so base address is reported 7ffff7371000 instead of 7ffff72ff000 for the following maps file:

7ffff72ff000-7ffff7371000 r--p 00000000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff7371000-7ffff7657000 r-xp 00072000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff7657000-7ffff7659000 rwxp 00358000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff7659000-7ffff780b000 r-xp 0035a000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff780b000-7ffff7812000 r--p 0050c000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff7812000-7ffff7813000 r--p 00513000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff7813000-7ffff7958000 r--p 00514000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff7958000-7ffff797c000 r--p 00658000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff797c000-7ffff7994000 rw-p 0067c000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so

This happens because we skip entries with don't have rx set, before merging entries for the same file.

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[am11]

It is like this since the initial implementation in 2015. Interesting that we have noticed it around the same time. :)
Discussion: #45180. PR: #45401.

Tagging subscribers to this area: @eiriktsarpalis, @jeffhandley
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Issue Details

---

For example, libcoreclr.so base address is reported 7ffff7371000 instead of 7ffff72ff000 for the following maps file:

7ffff72ff000-7ffff7371000 r--p 00000000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff7371000-7ffff7657000 r-xp 00072000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff7657000-7ffff7659000 rwxp 00358000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff7659000-7ffff780b000 r-xp 0035a000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff780b000-7ffff7812000 r--p 0050c000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff7812000-7ffff7813000 r--p 00513000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff7813000-7ffff7958000 r--p 00514000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff7958000-7ffff797c000 r--p 00658000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so
7ffff797c000-7ffff7994000 rw-p 0067c000 fd:00 18097725                   /usr/lib64/dotnet/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so

This happens because we skip entries with don't have rx set, before merging entries for the same file.

Author:	tmds
Assignees:	-
Labels:	area-System.Diagnostics.Process, untriaged
Milestone:	-

[danmoseley]

Closing as dupe 🙂