NetBSD Problem Report #58010

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Date: Fri,  8 Mar 2024 21:43:24 +0000 (UTC)
From: campbell+netbsd@mumble.net
Reply-To: campbell+netbsd@mumble.net
To: gnats-bugs@NetBSD.org
Subject: crash(8) doesn't support `mach cpu N' to examine registers/stack of other CPUs
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>Number:         58010
>Category:       bin
>Synopsis:       crash(8) doesn't support `mach cpu N' to examine registers/stack of other CPUs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 08 21:45:00 +0000 2024
>Last-Modified:  Mon Aug 17 19:00:01 +0000 2026
>Originator:     Taylor R Campbell
>Release:        current, 10, 9, 8, ...
>Organization:
The NetDDB Foundacrash
>Environment:
>Description:
The `mach cpu N' command in ddb lets you switch to another CPU's saved registers and stack, even if the CPU is running and they haven't been saved into the lwp state.  crash(8) is built without support for `mach cpu N', though.
>How-To-Repeat:
Try to examine another running CPU's registers and stack trace in a crash dump.
>Fix:
Yes, please!

>Audit-Trail:
From: "Taylor R Campbell" <riastradh@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/58010 CVS commit: src
Date: Mon, 17 Aug 2026 18:58:57 +0000

 Module Name:	src
 Committed By:	riastradh
 Date:		Mon Aug 17 18:58:57 UTC 2026

 Modified Files:
 	src/sys/arch/amd64/amd64: db_interface.c
 	src/sys/arch/i386/i386: db_interface.c
 	src/usr.sbin/crash: Makefile
 	src/usr.sbin/crash/arch: x86.c

 Log Message:
 crash(8): Add support for `mach cpu N' on x86.

 Requires core dump to have the registers saved on cpuN.  This happens
 with the ddb `sync' command, but not with the kern.dump_on_panic=1
 ddb.onpanic=0 path yet -- TBD.

 PR bin/58010: crash(8) doesn't support `mach cpu N' to examine
 registers/stack of other CPUs


 To generate a diff of this commit:
 cvs rdiff -u -r1.42 -r1.43 src/sys/arch/amd64/amd64/db_interface.c
 cvs rdiff -u -r1.90 -r1.91 src/sys/arch/i386/i386/db_interface.c
 cvs rdiff -u -r1.54 -r1.55 src/usr.sbin/crash/Makefile
 cvs rdiff -u -r1.4 -r1.5 src/usr.sbin/crash/arch/x86.c

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

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