audio panic booting -current under vbox 6.0.6

[Christoph Badura <bad%bsd.de@localhost>]

Yesterday I tried booting an amd64 install iso from sources updated
around 16:00 UTC under virtualbox 6.0.6.  The kernel  paniced with
  panic: audio_indexof_format: cannot find matched format

The VM was configured with 1GB of RAM, 5GB of disk. ICH9 chipset and ICH
AC97 audio.  Host is a macbook pro running up-to-date macOS.

The kernel messages via serial console are attached.

Anything I can do to help debug this?
--chris

[   1.0000000] Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
[   1.0000000]     2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
[   1.0000000]     2018, 2019 The NetBSD Foundation, Inc.  All rights reserved.
[   1.0000000] Copyright (c) 1982, 1986, 1989, 1991, 1993
[   1.0000000]     The Regents of the University of California.  All rights reserved.

[   1.0000000] NetBSD 8.99.39 (GENERIC) #0: Thu May  9 20:42:44 CEST 2019
[   1.0000000] 	bad%total-internal-reflection.k.bsd.de@localhost:/Users/bad/work/rump-current/src-cvs/obj/obj.amd64/sys/arch/amd64/compile/GENERIC
[   1.0000000] total memory = 1023 MB
[   1.0000000] avail memory = 966 MB
[   1.0000000] WARNING: module error: module `cd9660' pushed by boot loader already exists
[   1.0000000] cpu_rng: RDRAND
[   1.0000000] running cgd selftest aes-xts-256 aes-xts-512 done
[   1.0000030] mainbus0 (root)
[   1.0000030] ACPI: RSDP 0x00000000000E0000 000024 (v02 VBOX  )
[   1.0000030] ACPI: XSDT 0x000000003FFF0040 00004C (v01 VBOX   VBOXXSDT 00000001 ASL  00000061)
[   1.0000030] ACPI: FACP 0x000000003FFF0110 0000F4 (v04 VBOX   VBOXFACP 00000001 ASL  00000061)
[   1.0000030] ACPI: DSDT 0x000000003FFF0530 0022EA (v02 VBOX   VBOXBIOS 00000002 INTL 20100528)
[   1.0000030] ACPI: FACS 0x000000003FFF0240 000040
[   1.0000030] ACPI: APIC 0x000000003FFF0280 000054 (v02 VBOX   VBOXAPIC 00000001 ASL  00000061)
[   1.0000030] ACPI: HPET 0x000000003FFF02E0 000038 (v01 VBOX   VBOXHPET 00000001 ASL  00000061)
[   1.0000030] ACPI: MCFG 0x000000003FFF0320 00003C (v01 VBOX   VBOXMCFG 00000001 ASL  00000061)
[   1.0000030] ACPI: SSDT 0x000000003FFF0360 0001CC (v01 VBOX   VBOXCPUT 00000002 INTL 20100528)
[   1.0000030] ACPI: 2 ACPI AML tables successfully acquired and loaded
[   1.0000030] ioapic0 at mainbus0 apid 1
[   1.0000030] cpu0 at mainbus0 apid 0
[   1.0000030] cpu0: Intel(R) Core(TM) i7-4578U CPU @ 3.00GHz, id 0x40651
[   1.0000030] cpu0: package 0, core 0, smt 0
[   1.0000030] acpi0 at mainbus0: Intel ACPICA 20190405
[   1.0000030] acpi0: fixed power button present
[   1.0000030] acpi0: fixed sleep button present
[   1.0061613] hpet0 at acpi0: high precision event timer (mem 0xfed00000-0xfed00400)
[   1.0146367] pckbc1 at acpi0 (PS2K, PNP0303) (kbd port): io 0x60,0x64 irq 1
[   1.0146367] pckbc2 at acpi0 (PS2M, PNP0F03) (aux port): irq 12
[   1.0146367] attimer1 at acpi0 (TIMR, PNP0100): io 0x40-0x43,0x50-0x53
[   1.0146367] PCIE (PNP0C02) at acpi0 not configured
[   1.0146367] SRL0 (PNP0501) at acpi0 not configured
[   1.0146367] acpivga0 at acpi0 (GFX0): ACPI Display Adapter
[   1.0146367] acpiout0 at acpivga0 (VGA, 0x0100): ACPI Display Output Device
[   1.0146367] acpibat0 at acpi0 (BAT0, PNP0C0A-0): ACPI Battery
[   1.0146367] acpiacad0 at acpi0 (AC, ACPI0003-0): ACPI AC Adapter
[   1.0146367] ACPI: Enabled 2 GPEs in block 00 to 07
[   1.0146367] pckbd0 at pckbc1 (kbd slot)
[   1.0146367] pckbc1: using irq 1 for kbd slot
[   1.0146367] wskbd0 at pckbd0 mux 1
[   1.0146367] pms0 at pckbc1 (aux slot)
[   1.0146367] pckbc1: using irq 12 for aux slot
[   1.0146367] wsmouse0 at pms0 mux 0
[   1.0146367] pci0 at mainbus0 bus 0: configuration mode 1
[   1.0146367] vga0 at pci0 dev 2 function 0: vendor 80ee product beef (rev. 0x00)
[   1.0146367] wsdisplay0 at vga0 kbdmux 1
[   1.0146367] drm at vga0 not configured
[   1.0146367] wm0 at pci0 dev 3 function 0: Intel i82540EM 1000BASE-T Ethernet (rev. 0x02)
[   1.0146367] wm0: interrupting at ioapic0 pin 19
[   1.0146367] wm0: Ethernet address 08:00:27:0f:98:42
[   1.0146367] makphy0 at wm0 phy 1: Marvell 88E1011 Gigabit PHY, rev. 4
[   1.0146367] makphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
[   1.0146367] vendor 80ee product cafe (miscellaneous system) at pci0 dev 4 function 0 not configured
[   1.0146367] auich0 at pci0 dev 5 function 0: i82801AA (ICH) AC-97 Audio
[   1.0146367] auich0: interrupting at ioapic0 pin 21
[   1.0146367] auich0: ac97: SigmaTel STAC9700 codec; no 3D stereo
[   1.0146367] auich0: ac97: ext id 0x800<AC97_23>
[   1.0146367] piixpm0 at pci0 dev 7 function 0: vendor 8086 product 7113 (rev. 0x08)
[   1.0146367] piixpm0: interrupting at ioapic0 pin 23
[   1.0146367] iic0 at piixpm0: I2C bus
[   1.0146367] ichlpcib0 at pci0 dev 31 function 0: vendor 8086 product 27b9 (rev. 0x02)
[   1.0146367] ichlpcib0: 24-bit timer
[   1.0146367] tco0 at ichlpcib0: TCO (watchdog) timer configured.
[   1.0146367] ahcisata0 at pci0 dev 31 function 2: vendor 8086 product 2829 (rev. 0x02)
[   1.0146367] ahcisata0: AHCI revision 1.10, 2 ports, 32 slots, CAP 0xc8241f81<CCCS,SAM,ISS=0x2=Gen2,SSS,SNCQ,S64A>
[   1.0146367] ahcisata0: interrupting at ioapic0 pin 23
[   1.0146367] atabus0 at ahcisata0 channel 0
[   1.0146367] atabus1 at ahcisata0 channel 1
[   1.0146367] ohci0 at pci0 dev 31 function 4: vendor 106b product 003f (rev. 0x00)
[   1.0146367] ohci0: interrupting at ioapic0 pin 23
[   1.0146367] ohci0: OHCI version 1.0
[   1.0146367] usb0 at ohci0: USB revision 1.0
[   1.0146367] ehci0 at pci0 dev 31 function 5: vendor 8086 product 265c (rev. 0x00)
[   1.0146367] ehci0: interrupting at ioapic0 pin 23
[   1.0146367] usb1 at ehci0: USB revision 2.0
[   1.0146367] isa0 at ichlpcib0
[   1.0146367] com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
[   1.0146367] com0: console
[   1.0146367] pcppi0 at isa0 port 0x61
[   1.0146367] spkr0 at pcppi0: PC Speaker
[   1.0146367] wsbell at spkr0 not configured
[   1.0146367] midi0 at pcppi0: PC speaker
[   1.0146367] sysbeep0 at pcppi0
[   1.0146367] attimer1: attached to pcppi0
[   1.0146367] acpicpu0 at cpu0: ACPI CPU
[   1.8264124] acpiacad0: AC adapter online.
[   1.8264124] acpibat0: innotek VBOX rechargeable battery
[   1.8264124] audio0 at auich0: full duplex, playback, capture, mmap, independent
[   1.8376826] panic: audio_indexof_format: cannot find matched format

[   1.8466664] cpu0: Begin traceback...
[   1.8466664] vpanic() at netbsd:vpanic+0x160
[   1.8570985] snprintf() at netbsd:snprintf
[   1.8570985] audio_diagnostic_format2() at netbsd:audio_diagnostic_format2
[   1.8685949] auich_set_format() at netbsd:auich_set_format+0x5d
[   1.8685949] audio_hw_set_format() at netbsd:audio_hw_set_format+0xb2
[   1.8770981] audioattach() at netbsd:audioattach+0x521
[   1.8770981] config_attach_loc() at netbsd:config_attach_loc+0x1a5
[   1.8895393] config_found_sm_loc() at netbsd:config_found_sm_loc+0x48
[   1.8979084] audio_attach_mi() at netbsd:audio_attach_mi+0x32
[   1.9065508] auich_finish_attach() at netbsd:auich_finish_attach+0x67
[   1.9065508] config_interrupts_thread() at netbsd:config_interrupts_thread+0x9f
[   1.9177051] cpu0: End traceback...
[   1.9177051] fatal breakpoint trap in supervisor mode
[   1.9177051] trap type 1 code 0 rip 0xffffffff8021de4d cs 0x8 rflags 0x202 cr2 0 ilevel 0 rsp 0xffffa380328c8900
[   1.9350192] curlwp 0xfffffba74e6b2140 pid 0.26 lowest kstack 0xffffa380328c52c0
Stopped in pid 0.26 (system) at netbsd:breakpoint+0x5:  leave
db{0}> set
set
Unknown variable
db{0}> reboot 808
reboot 808
acpi0: entering state S5
total-internal-reflection:rump-current bad$ exit

Script done on Thu May  9 23:25:56 2019