Hello,
I am investigating a usb issue on my imx6-based novena, and I tried to
set a breakpoint to inspect the backtrace when the issue occurs. The
problem is, when resuming execution out of ddb, I get a uvm_fault and
then the only way forward is to reboot the system.
Am I missing a step ? or is it a bug ?
-> Kernel config
$ diff -Naur /usr/src/sys/arch/armv7/conf/{GENERIC,USBDEBUG}
--- /usr/src/sys/arch/armv7/conf/GENERIC Mon Dec 14 09:19:10 2020
+++ /usr/src/sys/arch/armv7/conf/USBDEBUG Sun Dec 13 17:26:09 2020
@@ -26,6 +26,11 @@
option USBVERBOSE
option USER_PCICONF # user-space PCI configuration
+option USB_DEBUG
+option UHUB_DEBUG
+option UMASS_DEBUG
+option EHCI_DEBUG
+
config bsd swap generic
# The main bus device
-> steps to reproduce over serial console
$ doas sysctl ddb.trigger=1
Stopped at db_enter: ldrb r15, [r15, r15, ror r15]!
ddb> break umass_bbb_reset
ddb> c
uvm_fault(0xc08d1260, c0659000, 2, 0) -> e
Fatal kernel mode data abort: 'Permission fault (L1)'
trapframe: 0xd0ccfcf8
DFSR=0000080d, DFAR=c06595b8, spsr=20000013
r0 =000000ff, r1 =c06595b8, r2 =00000000, r3 =00000002
r4 =c08e5164, r5 =c06595b8, r6 =d0ccfd91, r7 =00000003
r8 =c083ee30, r9 =00000004, r10=c06595b8, r11=d0ccfd88
r12=000fffff, ssp=d0ccfd48, slr=10600000, pc =c04d69c0
Stopped at db_write_bytes+0x3ac: strb r0, [r5], #0x001
ddb> trace
db_write_bytes+0x3ac
rlv=0xc03973fc rfp=0xd0ccfda0
db_put_value+0x50
rlv=0xc0669cc0 rfp=0xd0ccfdb0
db_set_breakpoints+0x54
rlv=0xc072e670 rfp=0xd0ccfdd8
db_restart_at_pc+0x178
rlv=0xc06731c4 rfp=0xd0ccfe00
db_trap+0x14c
rlv=0xc04d6b18 rfp=0xd0ccfe20
db_trapper+0x88
rlv=0xc06f4734 rfp=0xd0ccfe50
undefinedinstruction+0x114
rlv=0xc05b5a68 rfp=0xd0ccfed8
$a.13
rlv=0xc04b1a18 rfp=0xd0ccff40
sys_sysctl+0x17c
rlv=0xc0427620 rfp=0xd0ccffa8
swi_handler+0x2e0
rlv=0xc05b5898 rfp=0xbffe1460
-> dmesg
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
Copyrght (c) 1995-2020 OpenBSD. All rights reserved. https://www.OpenBS.org
OpenBSD 6.8-current (USBDEBUG) #2: Mon Dec 14 10:18:02 CET 2020
dermi...@derrida.kilob.yt:/usr/src/sys/arch/armv/compile/USBDEBUG
real mem = 3933511680 (3751MB)
avail mem = 3847270400 (3669MB)
random: good seed from bootblocks
mainbus0 at root: Kosagi Novena Dual/Quad
cpu0 at mainbus0 mpidr 0: ARM Cortex-A9 r2p10
cpu0: 32KB 32b/line 4-way L1 VIPT I-cache, 32KB 32b/line 4-way L1 D-cache
cortex0 at mainbus0
amptimer0 at cortex0: tick rate 396000 KHz
armliicc0 at cortex0: rtl 7 waymask: 0x0000000f
ampintc0 at mainbus0 nirq 160, ncpu 4: "interrupt-controller"
simplebus0 at mainbus0: "soc"
"dma-apbh" at simplebus0 not configured
"gpu" at simplebus0 not configured
"gpu" at simplebus0 not configured
"hdmi" at simplebus0 not configured
"timer" at simplebus0 not configured
"l2-cache" at simplebus0 not configured
"pcie" at simplebus0 not configured
"pmu" at simplebus0 not configured
simplebus1 at simplebus0: "aips-bus"
imxccm0 at simplebus1
imxanatop0 at simplebus1
syscon0 at simplebus1: "snvs"
imxrtc0 at syscon0
imxsrc0 at simplebus1
syscon1 at simplebus1: "iomuxc-gpr"
imxiomuxc0 at simplebus1
simplebus2 at simplebus1: "spba-bus"
"ssi" at simplebus2 not configured
"asrc" at simplebus2 not configured
"vpu" at simplebus1 not configured
"pwm" at simplebus1 not configured
"gpt" at simplebus1 not configured
imxgpio0 at simplebus1
imxgpio1 at simplebus1
imxgpio2 at simplebus1
imxgpio3 at simplebus1
imxgpio4 at simplebus1
imxgpio5 at simplebus1
imxgpio6 at simplebus1
"kpp" at simplebus1 not configured
imxdog0 at simplebus1
imxtemp0 at simplebus1
"usbphy" at simplebus1 not configured
"usbphy" at simplebus1 not configured
imxgpc0 at simplebus1
"ldb" at simplebus1 not configured
"sdma" at simplebus1 not configured
simplebus3 at simplebus0: "aips-bus"
syscon2 at simplebus3: "ocotp"
"caam" at simplebus3 not configured
imxehci0 at simplebus3
usb0 at imxehci0: USB revision 2.0
uhub0 at usb0 configuration 1 interface 0 "i.MX EHCI root hub" rev 2.00/1.00
addr 1
uhub0: 1 port with 1 removable, self powered
imxehci1 at simplebus3
usb1 at imxehci1: USB revision 2.0
uhub1 at usb1 configuration 1 interface 0 "i.MX EHCI root hub" rev 2.00/1.00
addr 1
uhub1: 1 port with 1 removable, self powered
"usbmisc" at simplebus3 not configured
fec0 at simplebus3
fec0: address 00:1f:11:02:17:de
ukphy0 at fec0 phy 7: Generic IEEE 802.3u media interface, rev. 1: OUI
0x000885, model 0x0021
imxesdhc0 at simplebus3
imxesdhc0: 198 MHz base clock
sdmmc0 at imxesdhc0: 4-bit, sd high-speed, mmc high-speed, dma
imxesdhc1 at simplebus3
imxesdhc1: 198 MHz base clock
sdmmc1 at imxesdhc1: 4-bit, sd high-speed, mmc high-speed, dma
imxiic0 at simplebus3
iic0 at imxiic0
"sbs,sbs-battery" at iic0 addr 0xb not configured
"kosagi,senoko" at iic0 addr 0x20 not configured
"st,stmpe811" at iic0 addr 0x44 not configured
"fsl,mma8452" at iic0 addr 0x1c not configured
pcfrtc0 at iic0 addr 0x68: battery low
imxiic1 at simplebus3
iic1 at imxiic1
"fsl,pfuze100" at iic1 addr 0x8 not configured
imxiic2 at simplebus3
iic2 at imxiic2
"everest,es8328" at iic2 addr 0x11 not configured
"kosagi,eepromoops" at iic2 addr 0x56 not configured
"it,it6251" at iic2 addr 0x5c not configured
"mmdc" at simplebus3 not configured
"weim" at simplebus3 not configured
"audmux" at simplebus3 not configured
imxuart0 at simplebus3: console
imxuart1 at simplebus3
imxuart2 at simplebus3
"ipu" at simplebus0 not configured
"sram" at simplebus0 not configured
imxahci0 at simplebus0: AHCI 1.3
imxahci0: port 0: 3.0Gb/s
scsibus0 at imxahci0: 32 targets
sd0 at scsibus0 targ 0 lun 0: <ATA, Samsung SSD 840, EXT0> naa.50025388a05aed8c
sd0: 238475MB, 512 bytes/sector, 488397168 sectors, thin
"gpu" at simplebus0 not configured
"ipu" at simplebus0 not configured
uhub1: intr status=0
uhub0: port 1 status=0x0500 change=0x0000
uhub1: port 1 status=0x0501 change=0x0001
scsibus1 at sdmmc1: 2 targets, initiator 0
sd1 at scsibus1 targ 1 lun 0: <SD/MMC, SMI, 0010> removable
sd1: 486MB, 512 bytes/sector, 996352 sectors
uhub1: intr status=0
uhub1: port 1 status=0x0503 change=0x0000
uhub2 at uhub1 port 1 configuration 1 interface 0 "Genesys Logic USB2.0 Hub
Charger" rev 2.00/1.97 addr 2
uhub2: 4 ports with 2 removable, self powered, multiple transaction translators
uhub2: intr status=0
uhub2: port 1 status=0x0101 change=0x0001
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: port 1 status=0x0503 change=0x0000
umass0 at uhub2 port 1 configuration 1 interface 0 "LG Electronics USB Flash
Drive" rev 2.00/11.00 addr 3
umass0: using SCSI over Bulk-Only
scsibus2 at umass0: 2 targets, initiator 0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
sd2 at scsibus2 targ 1 lun 0: <LGE, USB Drive, 1100> removable
serial.043e70d5012700026968
sd2: 3824MB, 512 bytes/sector, 7831552 sectors
uhub2: port 2 status=0x0101 change=0x0001
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: port 2 status=0x0503 change=0x0000
axe0 at uhub2 port 2 configuration 1 interface 0 "ASIX Electronics AX88772B"
rev 2.00/0.01 addr 4
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
uhub2: intr status=0
axe0: AX88772B, address 00:0e:c6:87:72:01
ukphy1 at axe0 phy 16: Generic IEEE 802.3u media interface, rev. 1: OUI
0x000ec6, model 0x0008
uhub2: port 3 status=0x0100 change=0x0000
uhub2: port 4 status=0x0101 change=0x0001
uhub2: intr status=0
uhub2: port 4 status=0x0503 change=0x0000
uhub3 at uhub2 port 4 configuration 1 interface 0 "Genesys Logic USB2.0 Hub
Charger" rev 2.00/1.97 addr 5
uhub3: 4 ports with 4 removable, self powered, multiple transaction translators
uhub3: port 1 status=0x0100 change=0x0000
uhub3: port 2 status=0x0100 change=0x0000
uhub3: port 3 status=0x0100 change=0x0000
uhub3: port 4 status=0x0100 change=0x0000
vscsi0 at root
scsibus3 at vscsi0: 256 targets
softraid0 at root
scsibus4 at softraid0: 256 targets
bootfile: sd1a:/bsd
boot device: sd1
root on sd0a (693b6ba8fef17d9a.a) swap on sd0b dump on sd0b
