Re: kern/59761: dmsetup broken in 10.1 with default GENERIC kernel

["Mike Edwards via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR kern/59761; it has been noted by GNATS.

From: Mike Edwards <mike%mobile.mirkwood.net@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost, 
	medwards-netbsd%mirkwood.net@localhost
Subject: Re: kern/59761: dmsetup broken in 10.1 with default GENERIC kernel
Date: Sun, 16 Nov 2025 18:58:35 +0000

 Well, this is bizarre:
 [ksh] root@netbsd02# ls -ld /dev/mapper/control
 crw-rw----  1 root  operator  0, 0 Nov 15 19:50 /dev/mapper/control
 
 0,0?  Oddly, dmsetup doesn't agree with ls here:
 [ksh] root@netbsd02# dmsetup -vv ls
 /dev/mapper/control: Wrong device number: (33, 176) instead of (194, 0)
 Creating device /dev/mapper/control (194, 0)
 Ioctl type  version --- flags 4
 ioctl version call failed with errno 25
 
 Command failed
 
 Why would ls report 0,0, and dmsetup 33,176?
 
 One other piece of information that it occurs to me may be relevant:
 This is a pvh vm running under Xen.
 
 On Sun, Nov 16, 2025 at 5:32=E2=80=AFPM Michael van Elst via gnats
 <gnats-admin%netbsd.org@localhost> wrote:
 >
 > The following reply was made to PR kern/59761; it has been noted by GNATS=
 .
 >
 > From: mlelstv%serpens.de@localhost (Michael van Elst)
 > To: gnats-bugs%netbsd.org@localhost
 > Cc:
 > Subject: Re: kern/59761: dmsetup broken in 10.1 with default GENERIC kern=
 el
 > Date: Sun, 16 Nov 2025 17:24:06 -0000 (UTC)
 >
 >  medwards-netbsd%mirkwood.net@localhost writes:
 >
 >  >This is easily seen with dmsetup --version or dmsetup ls:
 >  >[ksh] root@netbsd02# dmsetup --version
 >  >Library version:   1.02.40 (2009-11-24)
 >  >ioctl version call failed with errno 25
 >
 >  >Command failed
 >  >[ksh] root@netbsd02# dmsetup ls
 >  >ioctl version call failed with errno 25
 >
 >
 >  Can't reproduce that. Please check the output of
 >
 >     ls -ld /dev/mapper/control
 >
 >  it should be like this:
 >
 >  crw-rw----  1 root  operator  194, 0 Sep  7  2022 /dev/mapper/control
 >
 >
 >  Please also retry the dmsetup commands with two -v flags like:
 >
 >  # dmsetup -vv --version
 >  Library version:   1.02.40 (2009-11-24)
 >  Ioctl type  version --- flags 4
 >  Ioctl type  version --- flags 4
 >  Driver version:    4.16.0
 >
 >  # dmsetup -vv ls
 >  Ioctl type  version --- flags 4
 >  Ioctl type  names --- flags 4
 >  No devices found
 >
 >  to see if any errors are reported.
 >