NetBSD Problem Report #60123

From martin@gethsemane.aprisoft.de  Tue Mar 24 10:50:31 2026
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Date: Tue, 24 Mar 2026 11:50:22 +0100 (CET)
From: martin@NetBSD.org
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To: gnats-bugs@NetBSD.org
Subject: KASSERT when openeing a fss(4) device
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>Number:         60123
>Category:       kern
>Synopsis:       KASSERT when openeing a fss(4) device
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Mar 24 10:55:00 +0000 2026
>Last-Modified:  Tue Mar 24 13:30:01 +0000 2026
>Originator:     Martin Husemann
>Release:        NetBSD 11.99.5
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD gethsemane.aprisoft.de 11.99.5 NetBSD 11.99.5 (GETHSEMANE) #456: Tue Mar 24 10:07:39 CET 2026 martin@seven-days-to-the-wolves.aprisoft.de:/work/src/sys/arch/macppc/compile/GETHSEMANE macppc
Architecture: powerpc
Machine: macppc
>Description:

Early during a run of the ATF tests the kernel KASSERTs:

[ 2231.5664015] panic: kernel diagnostic assertion "KERNEL_LOCKED_P()" failed: f
ile "../../../../kern/subr_autoconf.c", line 2102
[ 2231.5864123] cpu1: Begin traceback...
[ 2231.5964165] 0x0e7acb60: at vpanic+0x154
[ 2231.6064211] 0x0e7acb90: at kern_assert+0x60
[ 2231.6164260] 0x0e7acbd0: at config_attach_pseudo+0x84
[ 2231.6264307] 0x0e7acbe0: at fss_open+0xec
[ 2231.6364359] 0x0e7acc00: at bdev_open+0x138
[ 2231.6464415] 0x0e7acc40: at spec_open+0x37c
[ 2231.6564459] 0x0e7accc0: at VOP_OPEN+0x4c
[ 2231.6664509] 0x0e7acce0: at vn_open+0x248
[ 2231.6764617] 0x0e7ace00: at do_open+0xac
[ 2231.6764617] 0x0e7ace50: at do_sys_openat+0x9c
[ 2231.6864641] 0x0e7ace90: at sys_open+0x2c
[ 2231.7064842] 0x0e7aceb0: at syscall+0x110




>How-To-Repeat:

run atf tests.

>Fix:
n/a

>Audit-Trail:
From: Takashi YAMAMOTO <yamt9999@gmail.com>
To: gnats-bugs@netbsd.org
Cc: kern-bug-people@netbsd.org, gnats-admin@netbsd.org, netbsd-bugs@netbsd.org
Subject: Re: kern/60123: KASSERT when openeing a fss(4) device
Date: Tue, 24 Mar 2026 22:16:37 +0900

 i guess fss should use config_attach_pseudo_acquire family of the functions.
 fss_device_lock seems insufficient as it doesn't exclude things like
 DRVDETACHDEV. (does it?)

 having said that, it seems we have too many drivers which would
 trigger these assertions.
 i will revert the assertion.

From: "YAMAMOTO Takashi" <yamt@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/60123 CVS commit: src/sys/kern
Date: Tue, 24 Mar 2026 13:28:06 +0000

 Module Name:	src
 Committed By:	yamt
 Date:		Tue Mar 24 13:28:06 UTC 2026

 Modified Files:
 	src/sys/kern: subr_autoconf.c

 Log Message:
 Revert "config_attach_pseudo/config_attach_pseudo: assert kernel lock"

 it turned out that we have too many drivers which would trigger
 these assertions. although my impression is that they are actually
 not mpsafe, let's revert the assertions for now.

 PR/60123
 https://gnats.netbsd.org/60123


 To generate a diff of this commit:
 cvs rdiff -u -r1.319 -r1.320 src/sys/kern/subr_autoconf.c

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

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