NetBSD Problem Report #53328

From www@NetBSD.org  Tue May 29 15:37:40 2018
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Date: Tue, 29 May 2018 15:37:38 +0000 (UTC)
From: prlw1@cam.ac.uk
Reply-To: prlw1@cam.ac.uk
To: gnats-bugs@NetBSD.org
Subject: xhci panic on netboot
X-Send-Pr-Version: www-1.0

>Number:         53328
>Category:       kern
>Synopsis:       xhci panic on netboot
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue May 29 15:40:00 +0000 2018
>Last-Modified:  Fri Nov 01 12:00:01 +0000 2019
>Originator:     Patrick Welche
>Release:        NetBSD-8.99.19/amd64
>Organization:
>Environment:
>Description:
Just tried to netboot a GENERIC kernel on a new computer over nfs. I'm not sure now whether I actually hit return/enter or not at the root on wm0 prompt. On screen, I see:

ums0: detached
uhidev2: detached
uhidev2: at uhub1 port 2 (addr 2) disconnected
panic: kernel diagnostic assertion "mutex_owned(&sc->sc_lock)" failed: file "/usr/src/sys/dev/usb/xhci.c", line 2049
cpu0: Begin traceback...
vpanic() at netbsd:vpanic+0x16f
ch_voltag_convert_in() at netbsd:ch_voltag_convert_in
xhci_softintr() at nebsd:xhci_softintr+0x5d7
xhci_poll() at netbsd:xhci_poll+0x37
ukbd_cngetc() at netbsd:ukbd_cngetc+0x113
wskbd_cngetc() at netbsd:wskbd_cngetc+0xc8
wsdisplay_getc() at netbsd:wsdisplay_getc+0x2f
cngetc() at netbsd:cngetc+0x4d
cngetsn() at netbsd:cngetsn+0x71
setroot() at netbsd:setroot+0x133
main() at netbsd:main+0x6af
cpu0: End traceback...
fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip 0xffffffff8021eb75 cs 0x8 rflags 0x202 cr2 0 ilevel 0x8 rsp 0xffffffff87fda70
curlwp 0xffffffff81481f60 pid 0.1 lowest kstack 0xffffffff817f92c0

>How-To-Repeat:

>Fix:

>Audit-Trail:
From: Patrick Welche <prlw1@cam.ac.uk>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: kern/53328: xhci panic on netboot
Date: Fri, 1 Nov 2019 11:58:02 +0000

 Encountered basically the same thing with yesterday's 9.99.17/amd64
 It may be the same computer. Backtrace looks slightly different now:

 panic: LOCKDEBUG: Mutex error: mutex_vector_enter,530: spin lock helod
 lockdebug_more
 mutex_enter
 uhub_intr
 usb_transfer_complete
 xhci_softintr
 xhci_poll
 ukbd_cngetc
 wskbd_cngetc
 wsdisplay_getc
 cngetc.part.0
 cngetsn
 setroot  <- one issue is because of dhcp timeout, nfs root (wm0) couldn't be
             mounted
 main

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