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x/sys/windows/svc: gs:28h is zero after servicemain returns sometimes #47792

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zx2c4 opened this issue Aug 18, 2021 · 1 comment
Open

x/sys/windows/svc: gs:28h is zero after servicemain returns sometimes #47792

zx2c4 opened this issue Aug 18, 2021 · 1 comment
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NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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@zx2c4
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zx2c4 commented Aug 18, 2021 •
edited

I'm very rarely seeing crashes when using services from c-shared hosted in a .NET process, when calling svc.Stop, to the tune of:

Application: demo-client.exe
CoreCLR Version: 5.0.921.35908
.NET Version: 5.0.9
Description: The process was terminated due to an unhandled exception.
Exception Info: exception code c0000005, exception address 00007FF9286BCFC8

Disassembling, that matches:

image

Apparently our TLS slot has been zeroed by something?
@gopherbot gopherbot added this to the Unreleased milestone Aug 18, 2021
@mknyszek mknyszek added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Aug 18, 2021
@mknyszek
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CC @alexbrainman

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