NetBSD Problem Report #59242

From paul@whooppee.com  Mon Mar 31 15:31:40 2025
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Message-Id: <20250331153137.EA03C49A960@speedy.whooppee.com>
Date: Mon, 31 Mar 2025 08:31:37 -0700 (PDT)
From: paul@whooppee.com
Reply-To: paul@whooppee.com
To: gnats-bugs@NetBSD.org
Subject: keyboard/mouse stop working in X
X-Send-Pr-Version: 3.95

>Number:         59242
>Category:       kern
>Synopsis:       keyboard/mouse stop working in X
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Mar 31 15:35:00 +0000 2025
>Last-Modified:  Fri Apr 04 23:35:01 +0000 2025
>Originator:     Paul Goyette
>Release:        NetBSD 10.99.12
>Organization:
+---------------------+--------------------------+----------------------+
| Paul Goyette (.sig) | PGP Key fingerprint:     | E-mail addresses:    |
| (Retired)           | 1B11 1849 721C 56C8 F63A | paul@whooppee.com    |
| Software Developer  | 6E2E 05FD 15CE 9F2D 5102 | pgoyette@netbsd.org  |
| & Network Engineer  |                          | pgoyette99@gmail.com |
+---------------------+--------------------------+----------------------+
>Environment:


System: NetBSD speedy.whooppee.com 10.99.12 NetBSD 10.99.12 (SPEEDY 2025-03-28 23:40:52 UTC) #0: Sat Mar 29 00:36:14 UTC 2025 paul@speedy.whooppee.com:/build/netbsd-local/obj/amd64/sys/arch/amd64/compile/SPEEDY amd64
Architecture: x86_64
Machine: amd64
>Description:
At unpredictable interval, and with no known/reproducible trigger, the
keyboard and mouse events stop.  All keyboard activity, including Ctrl-
Alt sequences for switching vt or entering ddb, just stop.  And, after
approximately 1 minute, background processes seem to stop - as an example,
a running xclock ceases to display movement of the seconds hand.

Most occurrences of this have occurred while moving the cursor in a
browser window.  Both firefox and chromium exhibit the bug, but chromium
"feels less likely" to happen.

Since it is impossible to enter ddb, I can't collect any additional info.
I am just filing this PR in case someone else runs into something similar
with more debug tools available.

>How-To-Repeat:
unknown

>Fix:
	A fix would be nice.

>Audit-Trail:
From: Paul Goyette <paul@whooppee.com>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: kern/59242: keyboard/mouse stop working in X
Date: Mon, 31 Mar 2025 08:42:58 -0700 (PDT)

 I should add that when the "hang" occurs, I am unable to ssh in from
 another devicce.  I have not checked if an existing network session
 survives.

From: Paul Goyette <paul@whooppee.com>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: kern/59242: keyboard/mouse stop working in X
Date: Mon, 31 Mar 2025 16:52:04 -0700 (PDT)

 yOn Mon, 31 Mar 2025, Paul Goyette wrote:

 > I should add that when the "hang" occurs, I am unable to ssh in from
 > another devicce.  I have not checked if an existing network session
 > survives.

 I just checked, the ssh session stops transferring data.  tcp timeout
 takes several minutes.

From: RVP <rvp@SDF.ORG>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: kern/59242: keyboard/mouse stop working in X
Date: Wed, 2 Apr 2025 06:39:26 +0000 (UTC)

 On Mon, 31 Mar 2025, paul@whooppee.com wrote:

 > At unpredictable interval, and with no known/reproducible trigger, the
 > keyboard and mouse events stop.  All keyboard activity, including Ctrl-
 > Alt sequences for switching vt or entering ddb, just stop.  And, after
 > approximately 1 minute, background processes seem to stop - as an example,
 > a running xclock ceases to display movement of the seconds hand.
 >

 DRMKMS bug, methinks. Does it occur if you switch to genfb(4) + wsfb(4)?

 ```
 userconf=disable i915drmkms*
 userconf=disable radeon*
 userconf=disable nouveau*
 ```

 in /boot.cfg; and then read:

 https://wiki.netbsd.org/tutorials/x11/how_to_use_wsfb_uefi_bios_framebuffer/

 -RVP

From: Paul Goyette <paul@whooppee.com>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: kern/59242: keyboard/mouse stop working in X
Date: Wed, 2 Apr 2025 06:34:44 -0700 (PDT)

 On Wed, 2 Apr 2025, RVP via gnats wrote:

 > The following reply was made to PR kern/59242; it has been noted by GNATS.
 >
 > > At unpredictable interval, and with no known/reproducible trigger, the
 > > keyboard and mouse events stop.  All keyboard activity, including Ctrl-
 > > Alt sequences for switching vt or entering ddb, just stop.  And, after
 > > approximately 1 minute, background processes seem to stop - as an example,
 > > a running xclock ceases to display movement of the seconds hand.
 > >
 >
 > DRMKMS bug, methinks. Does it occur if you switch to genfb(4) + wsfb(4)?
 >
 > ```
 > userconf=disable i915drmkms*
 > userconf=disable radeon*
 > userconf=disable nouveau*
 > ```

 IT would be difficult to try this, as it often takes hours (Or even
 fdays) for the problem to occur.  genfb is quite "uncomfortable" to
 use for any length of time.

 > in /boot.cfg; and then read:
 >
 > https://wiki.netbsd.org/tutorials/x11/how_to_use_wsfb_uefi_bios_framebuffer/

 Thanks for the pointer.  It might make it more "comfortable" to use
 the preceeding stuff.

 +---------------------+--------------------------+----------------------+
 | Paul Goyette (.sig) | PGP Key fingerprint:     | E-mail addresses:    |
 | (Retired)           | 1B11 1849 721C 56C8 F63A | paul@whooppee.com    |
 | Software Developer  | 6E2E 05FD 15CE 9F2D 5102 | pgoyette@netbsd.org  |
 | & Network Engineer  |                          | pgoyette99@gmail.com |
 +---------------------+--------------------------+----------------------+

From: Paul Goyette <paul@whooppee.com>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: kern/59242: keyboard/mouse stop working in X
Date: Fri, 4 Apr 2025 16:34:34 -0700 (PDT)

 On Wed, 2 Apr 2025, Paul Goyette wrote:

 >> DRMKMS bug, methinks. Does it occur if you switch to genfb(4) + wsfb(4)?
 >> 
 >> ```
 >> userconf=disable i915drmkms*
 >> userconf=disable radeon*
 >> userconf=disable nouveau*
 >> ```
 >
 > IT would be difficult to try this, as it often takes hours (Or even
 > fdays) for the problem to occur.  genfb is quite "uncomfortable" to
 > use for any length of time.
 >
 >> in /boot.cfg; and then read:
 >> 
 >> https://wiki.netbsd.org/tutorials/x11/how_to_use_wsfb_uefi_bios_framebuffer/
 >
 > Thanks for the pointer.  It might make it more "comfortable" to use
 > the preceeding stuff.

 Indeed, trying genfb was not too painful.  And the problem appeared
 immediately after the boot, during chromium's restoration of its
 pre-hang state.

 Same symptoms, and nothing relevant in dmesg

 +---------------------+--------------------------+----------------------+
 | Paul Goyette (.sig) | PGP Key fingerprint:     | E-mail addresses:    |
 | (Retired)           | 1B11 1849 721C 56C8 F63A | paul@whooppee.com    |
 | Software Developer  | 6E2E 05FD 15CE 9F2D 5102 | pgoyette@netbsd.org  |
 | & Network Engineer  |                          | pgoyette99@gmail.com |
 +---------------------+--------------------------+----------------------+

>Unformatted:

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