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ProcessModule.BaseAddress is sometimes incorrect on Linux #45482

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tmds opened this issue Dec 2, 2020 · 4 comments
Closed

ProcessModule.BaseAddress is sometimes incorrect on Linux #45482

tmds opened this issue Dec 2, 2020 · 4 comments
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area-System.Diagnostics.Process untriaged New issue has not been triaged by the area owner

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@tmds
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tmds commented Dec 2, 2020

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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I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

@Dotnet-GitSync-Bot Dotnet-GitSync-Bot added the untriaged New issue has not been triaged by the area owner label Dec 2, 2020
@am11
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am11 commented Dec 2, 2020

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

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ghost commented Dec 2, 2020

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
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area-System.Diagnostics.Process, untriaged
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@danmoseley
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Closing as dupe 🙂

@tmds tmds mentioned this issue Dec 9, 2020
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@ghost ghost locked as resolved and limited conversation to collaborators Jan 1, 2021
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