NetBSD Problem Report #59921

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Date: Thu, 15 Jan 2026 02:01:26 +0000 (UTC)
From: campbell+netbsd@mumble.net
Reply-To: campbell+netbsd@mumble.net
To: gnats-bugs@NetBSD.org
Subject: kdump(1) doesn't decode sigprocmask
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X-From4GNATS: "campbell+netbsd@mumble.net via gnats" <gnats-admin@NetBSD.org>

>Number:         59921
>Category:       bin
>Synopsis:       kdump(1) doesn't decode sigprocmask
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jan 15 02:05:00 +0000 2026
>Last-Modified:  Sun Feb 01 19:45:01 +0000 2026
>Originator:     Taylor R Campbell
>Release:        current, 11, 10, 9, ...
>Organization:
The NetBSDump 0xffff01nd4t10n
>Environment:
>Description:
ktrace/kdump doesn't show what operation is being done to a signal set in sigprocmask (i.e., __sigprocmask14, or any of the older compat syscalls), and what the signal set is.  For example:

 12720  12720 python3.12 CALL  __sigprocmask14(1,0x7f7fff114c10,0x7f7fff114c50)
 12720  12720 python3.12 RET   __sigprocmask14 0
 12720  12720 python3.12 CALL  __sigprocmask14(3,0x7f7fff114c50,0)
 12720  12720 python3.12 RET   __sigprocmask14 0

It would be nice if it showed a meaningful name like SIG_BLOCK and the set of signals being blocked.  (Likewise for pthread_sigmask.  Would also be nice if sigaction, i.e., __sigaction_sigtramp, decomposed the struct sigaction.)
>How-To-Repeat:
ktrace/kdump a program that uses sigprocmask
>Fix:
Yes, please!

>Audit-Trail:
From: "Christos Zoulas" <christos@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/59921 CVS commit: src
Date: Sun, 1 Feb 2026 14:41:47 -0500

 Module Name:	src
 Committed By:	christos
 Date:		Sun Feb  1 19:41:47 UTC 2026

 Modified Files:
 	src/sys/kern: kern_ktrace.c kern_stub.c sys_sig.c
 	src/sys/sys: ktrace.h
 	src/usr.bin/kdump: kdump.c
 	src/usr.bin/ktrace: ktrace.h

 Log Message:
 PR/59921: Show sigprogmask bits when tracing.


 To generate a diff of this commit:
 cvs rdiff -u -r1.187 -r1.188 src/sys/kern/kern_ktrace.c
 cvs rdiff -u -r1.52 -r1.53 src/sys/kern/kern_stub.c
 cvs rdiff -u -r1.61 -r1.62 src/sys/kern/sys_sig.c
 cvs rdiff -u -r1.71 -r1.72 src/sys/sys/ktrace.h
 cvs rdiff -u -r1.149 -r1.150 src/usr.bin/kdump/kdump.c
 cvs rdiff -u -r1.21 -r1.22 src/usr.bin/ktrace/ktrace.h

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

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