[Bug 228773] hang on boot before mounting / when 'verbose boot' not selected

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Wed Jun 6 05:00:30 UTC 2018


            Bug ID: 228773
           Summary: hang on boot before mounting / when 'verbose boot' not
           Product: Base System
           Version: CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: bobf at mrp3.com

using rev 334665 on an RPi 2 using the older bcm2836 CPU.

I have been able to consistently demonstrate this problem more than half of the
time when I boot up from a power up, or a 'reboot', or by pressing a key in the
serial console after 'poweroff'.

The hang appears to happen immediately after the following text displays on the

  Releasing APs

Consistently, whenever I enable verbose output as a boot option in the
'beastie' menu, the reboot takes place normally, i.e. without hanging.

uname output:
FreeBSD pi2c 12.0-CURRENT FreeBSD 12.0-CURRENT #2 r334665M: Tue Jun  5 21:17:17
PDT 2018    
bobf at hack.SFT.local:/e-drive/obj.current/e-drive/src.current/arm.armv7/sys/RPI2

The problem first appeared when I obtained source yesterday and built a fresh
version.  Prior to this I had been using code that was around 3 or 4 weeks old.

This problem was reproduced several times with unmodified code and no
additional overlays or kernel modules being loaded.

Typical console output demonstrating problem:

/boot/dtb/bcm2836-rpi-2-b.dtb size=0x4c49
Loaded DTB from file 'bcm2836-rpi-2-b.dtb'.
Kernel entry at 0x1200100...
Kernel args: (null)
KDB: debugger backends: ddb
KDB: current backend: ddb
Copyright (c) 1992-2018 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 12.0-CURRENT #2 r334665M: Tue Jun  5 21:17:17 PDT 2018
bobf at hack.SFT.local:/e-drive/obj.current/e-drive/src.current/arm.armv7/sys/RPI2
FreeBSD clang version 6.0.0 (tags/RELEASE_600/final 326565) (based on LLVM
WARNING: WITNESS option enabled, expect reduced performance.
VT: init without driver.
CPU: ARM Cortex-A7 r0p5 (ECO: 0x00000000)
CPU Features: 
  Multiprocessing, Thumb2, Security, Virtualization, Generic Timer, VMSAv7,
  PXN, LPAE, Coherent Walk
Optional instructions: 
LoUU:2 LoC:3 LoUIS:2 
Cache level 1:
 32KB/64B 4-way data cache WB Read-Alloc Write-Alloc
 32KB/32B 2-way instruction cache Read-Alloc
Cache level 2:
 512KB/64B 8-way unified cache WB Read-Alloc Write-Alloc
real memory  = 0 (0 MB)
avail memory = 1008672768 (961 MB)
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
random: unblocking device.
random: entropy device external interface
kbd0 at kbdmux0
ofwbus0: <Open Firmware Device Tree>
simplebus0: <Flattened device tree simple bus> on ofwbus0
local_intc0: <BCM2836 Interrupt Controller> mem 0x40000000-0x400000ff on
intc0: <BCM2835 Interrupt Controller> mem 0x7e00b200-0x7e00b3ff irq 25 on
gpio0: <BCM2708/2835 GPIO controller> mem 0x7e200000-0x7e2000b3 irq 27,28,29,30
on simplebus0
gpio0: read-only pins: 46-53.
gpio0: reserved pins: 48-53.
gpiobus0: <OFW GPIO bus> on gpio0
generic_timer0: <ARMv7 Generic Timer> irq 1,2,3,4 on ofwbus0
Timecounter "ARM MPCore Timecounter" frequency 19200000 Hz quality 1000
Event timer "ARM MPCore Eventtimer" frequency 19200000 Hz quality 1000
bcm_dma0: <BCM2835 DMA Controller> mem 0x7e007000-0x7e007eff irq
9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24 on simplebus0
bcmwd0: <BCM2708/2835 Watchdog> mem 0x7e100000-0x7e100027 on simplebus0
bcmrng0: <Broadcom BCM2835 RNG> mem 0x7e104000-0x7e10400f on simplebus0
mbox0: <BCM2835 VideoCore Mailbox> mem 0x7e00b880-0x7e00b8bf irq 26 on
gpioc0: <GPIO controller> on gpio0
uart0: <PrimeCell UART (PL011)> mem 0x7e201000-0x7e201fff irq 31 on simplebus0
uart0: console (115200,n,8,1)
spi0: <BCM2708/2835 SPI controller> mem 0x7e204000-0x7e204fff irq 33 on
spibus0: <OFW SPI bus> on spi0
iichb0: <BCM2708/2835 BSC controller> mem 0x7e205000-0x7e205fff irq 34 on
sdhci_bcm0: <Broadcom 2708 SDHCI controller> mem 0x7e300000-0x7e3000ff irq 41
on simplebus0
mmc0: <MMC/SD bus> on sdhci_bcm0
iichb1: <BCM2708/2835 BSC controller> mem 0x7e804000-0x7e804fff irq 44 on
iichb2: <BCM2708/2835 BSC controller> mem 0x7e805000-0x7e805fff irq 45 on
bcm283x_dwcotg0: <DWC OTG 2.0 integrated USB controller (bcm283x)> mem
0x7e980000-0x7e98ffff irq 50 on simplebus0
usbus0 on bcm283x_dwcotg0
vchiq0: <BCM2835 VCHIQ> mem 0x7e00b840-0x7e00b84e irq 52 on simplebus0
vchiq: local ver 8 (min 3), remote ver 8.
pcm0: <VCHIQ audio> on vchiq0
fb0: <BCM2835 VT framebuffer driver> on simplebus0
fbd0 on fb0
VT: initialize with new VT driver "fb".
fb0: 656x416(656x416 at 0,0) 24bpp
fb0: fbswap: 0, pitch 1968, base 0x3ef34000, screen_size 818688
cpulist0: <Open Firmware CPU Group> on ofwbus0
cpu0: <Open Firmware CPU> on cpulist0
bcm2835_cpufreq0: <CPU Frequency Control> on cpu0
cpu1: <Open Firmware CPU> on cpulist0
cpu2: <Open Firmware CPU> on cpulist0
cpu3: <Open Firmware CPU> on cpulist0
gpioled0: <GPIO LEDs> on ofwbus0
cryptosoft0: <software crypto>
Timecounters tick every 1.000 msec
usbus0: 480Mbps High Speed USB v2.0
iicbus0: <OFW I2C bus> on iichb0
iic0: <I2C generic I/O> on iicbus0
ugen0.1: <DWCOTG OTG Root HUB> at usbus0
uhub0: <DWCOTG OTG Root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus0
mmcsd0: 4GB <SDHC SS04G 8.0 SN 032B0249 MFG 11/2014 by 3 SD> at mmc0
iicbus1: <OFW I2C bus> on iichb1
iic1: <I2C generic I/O> on iicbus1
iicbus2: <OFW I2C bus> on iichb2
iic2: <I2C generic I/O> on iicbus2
bcm2835_cpufreq0: ARM 600MHz, Core 250MHz, SDRAM 400MHz, Turbo OFF
Release APs

(this is where the hang takes place; no response to keyboard input on the
serial console at this point.  power cycle is only option)

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