kern/59497: Panic in ucompoll

[stix%stix.id.au@localhost]

>Number:         59497
>Category:       kern
>Synopsis:       Panic in ucompoll
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jul 01 09:20:00 +0000 2025
>Originator:     Paul Ripke
>Release:        NetBSD 10.1_STABLE
>Organization:
Paul Ripke
"Great minds discuss ideas, average minds discuss events, small minds
 discuss people."
-- Disputed: Often attributed to Eleanor Roosevelt. 1948.
>Environment:
System: NetBSD slave 10.1_STABLE NetBSD 10.1_STABLE (SLAVE) #17: Fri Apr 18 13:51:35 AEST 2025 stix@slave:/home/netbsd/netbsd-10/obj.amd64/home/netbsd/netbsd-10/src/sys/arch/amd64/compile/SLAVE amd64
Architecture: x86_64
Machine: amd64
>Description:
Crash appears due to intermittent disconnect/reconnect of a uplcom device while open.

Device is:
addr 54: full speed, power 100 mA, config 1, USB-Serial Controller D(0x2303), Prolific Technology Inc.(0x067b), rev 4.00(0x0400)

uplcom0 at uhub9 port 1
uplcom0: Prolific Technology Inc. (0x067b) USB-Serial Controller D (0x2303), rev 1.10/4.00, addr 5
ucom0 at uplcom0

Periodically:
Jun 28 14:27:01 slave /netbsd: [ 2332157.9354694] ucom2: detached
Jun 28 14:27:01 slave /netbsd: [ 2332157.9354694] uplcom1: detached
Jun 28 14:27:01 slave /netbsd: [ 2332157.9354694] uplcom1: at uhub1 port 8 (addr 52) disconnected
Jun 28 14:27:10 slave /netbsd: [ 2332166.7886134] uplcom1 at uhub1 port 8
Jun 28 14:27:10 slave /netbsd: [ 2332166.7886134] uplcom1: Prolific Technology Inc. (0x067b) USB-Serial Controller D (0x2303), rev 1.10/4.00, addr 53
Jun 28 14:27:10 slave /netbsd: [ 2332166.8096137] ucom2 at uplcom1
Jun 28 14:27:10 slave /netbsd: [ 2332166.8246139] ucom2: detached
Jun 28 14:27:10 slave /netbsd: [ 2332166.8246139] uplcom1: detached
Jun 28 14:27:10 slave /netbsd: [ 2332166.8246139] uplcom1: at uhub1 port 8 (addr 53) disconnected
Jun 28 14:27:11 slave /netbsd: [ 2332167.3396223] uplcom1 at uhub1 port 8
Jun 28 14:27:11 slave /netbsd: [ 2332167.3396223] uplcom1: Prolific Technology Inc. (0x067b) USB-Serial Controller D (0x2303), rev 1.10/4.00, addr 54
Jun 28 14:27:11 slave /netbsd: [ 2332167.3606226] ucom2 at uplcom1

crash> bt
__kernel_end() at 0
kern_reboot() at sys_reboot
vpanic() at vpanic+0x18d
panic() at vprintf
trap() at startlwp
--- trap (number 6) ---
ucompoll() at ucompoll+0x2a
cdev_poll() at cdev_poll+0x87
spec_poll() at spec_poll+0x6a
VOP_POLL() at VOP_POLL+0x5d
sel_do_scan() at sel_do_scan+0x3ba
selcommon() at selcommon+0x309
sys___select50() at sys___select50+0x75
syscall() at syscall+0x1fc
--- syscall (number 417) ---
syscall+0x1fc:

Have core and kernel with symbols.

>How-To-Repeat:

>Fix: