NetBSD Problem Report #58373

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Date: Thu, 27 Jun 2024 13:08:45 +0000 (UTC)
From: campbell+netbsd@mumble.net
Reply-To: campbell+netbsd@mumble.net
To: gnats-bugs@NetBSD.org
Subject: Missing KDTRACE_HOOKS in Xen kernels
X-Send-Pr-Version: www-1.0

>Number:         58373
>Category:       port-xen
>Synopsis:       Missing KDTRACE_HOOKS in Xen kernels
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    riastradh
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jun 27 13:10:00 +0000 2024
>Closed-Date:    
>Last-Modified:  Sat Oct 12 13:31:37 +0000 2024
>Originator:     Taylor R Campbell
>Release:        10
>Organization:
The XenBSDtrace Foundation
>Environment:
>Description:
Committed to HEAD but never pulled up:

https://mail-index.netbsd.org/source-changes/2023/07/21/msg146150.html
https://mail-index.netbsd.org/source-changes/2023/07/21/msg146151.html
https://mail-index.netbsd.org/source-changes/2023/07/21/msg146152.html
https://mail-index.netbsd.org/source-changes/2023/07/22/msg146171.html
https://mail-index.netbsd.org/source-changes/2023/07/22/msg146172.html
https://mail-index.netbsd.org/source-changes/2023/07/22/msg146173.html
>How-To-Repeat:
# modload dtrace
[ 591773.132744] kobj_checksyms, 1004: [solaris]: linker error: symbol `sdt_provider_sdt' not found
[ 591773.132744] WARNING: module error: unable to affix module `solaris', error 8
[ 591773.132744] WARNING: module error: recursive load failed for `dtrace' (`solaris' required), error 8

>Fix:
pull up changes to 10

>Release-Note:

>Audit-Trail:

Responsible-Changed-From-To: port-xen-maintainer->riastradh
Responsible-Changed-By: riastradh@NetBSD.org
Responsible-Changed-When: Thu, 27 Jun 2024 13:25:50 +0000
Responsible-Changed-Why:
mine


State-Changed-From-To: open->needs-pullups
State-Changed-By: riastradh@NetBSD.org
State-Changed-When: Thu, 27 Jun 2024 13:25:50 +0000
State-Changed-Why:
fixed in HEAD, needs pullup-10
pullup-9 might require more work to test


State-Changed-From-To: needs-pullups->open
State-Changed-By: riastradh@NetBSD.org
State-Changed-When: Sat, 12 Oct 2024 13:31:37 +0000
State-Changed-Why:
If I recall correctly, on analysis of PR 57535 (which I foolishly
neglected to write down there), the Xen kernel doesn't get loaded with
CTF data, which makes dtrace much less useful.  So that really needs to
be fixed first.

Specifically (going off vague memory), I think the kernel image that
xen_init_ksyms passes through to ksysm_addsyms_elf, whose parameters
have been set up in locore.S, is missing a .SUNW_ctf section.

Need to look closer into this -- it's been a while since I looked at
this and I don't seem to have written it down contemporaneously.


>Unformatted:

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