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From: "agentzh at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/31053] New: The stap runtime's allocator might sleep in
 atomic contexts
Date: Sat, 11 Nov 2023 07:19:41 +0000
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X-Bugzilla-Product: systemtap
X-Bugzilla-Component: runtime
X-Bugzilla-Version: unspecified
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: agentzh at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: systemtap at sourceware dot org
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31053

            Bug ID: 31053
           Summary: The stap runtime's allocator might sleep in atomic
                    contexts
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: agentzh at gmail dot com
  Target Milestone: ---

Currently, the `STP_ALLOC_FLAGS` flag used in the stap kernel runtime's
allocator actually includes __GFP_IO and __GFP_FS flags which might sleep. =
All
kernels since 3.10 would trigger this bug. But the STP_ALLOC_FLAGS is suppo=
sed
to be used "anywhere", including atomic contexts, according to the existing
code comment:

```
 /* Default, and should be "safe" from anywhere. */
```

I'll fix it in a patch. Glad we drop support for the 2.6 kernels so we can
remove a lot of baggage here.

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