Date: Tue, 9 Feb 2010 23:41:49 GMT From: Stéphane LAPIE <stephane.lapie@darkbsd.org> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/143714: ATA queue event handling mishap provokes kernel panic Message-ID: <201002092341.o19NfnOE097302@www.freebsd.org> Resent-Message-ID: <201002092350.o19No1AF020767@freefall.freebsd.org>
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>Number: 143714
>Category: kern
>Synopsis: ATA queue event handling mishap provokes kernel panic
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Feb 09 23:50:01 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: Stéphane LAPIE
>Release: 8.0-STABLE
>Organization:
Aozora Bank, Ltd.
>Environment:
FreeBSD eirei-no-za.yomi.darkbsd.org 8.0-STABLE FreeBSD 8.0-STABLE #0: Wed Feb 3 03:05:37 JST 2010 darksoul@eirei-no-za.yomi.darkbsd.org:/usr/storage/tech/eirei-no-za.yomi.darkbsd.org/usr/obj/usr/storage/tech/eirei-no-za.yomi.darkbsd.org/usr/src/sys/DARK-2010KERN amd64
>Description:
When using the following controllers :
atapci0@pci0:7:1:0: class=0x010000 card=0x11ab11ab chip=0x608111ab rev=0x09 hdr=0x00
vendor = 'Marvell Semiconductor (Was: Galileo Technology Ltd)'
device = 'MV88SX6081 8-port SATA II PCI-X Controller'
class = mass storage
subclass = SCSI
atapci1@pci0:7:7:0: class=0x010000 card=0x11ab11ab chip=0x608111ab rev=0x09 hdr=0x00
vendor = 'Marvell Semiconductor (Was: Galileo Technology Ltd)'
device = 'MV88SX6081 8-port SATA II PCI-X Controller'
class = mass storage
subclass = SCSI
Upon removing physically a disk, or upon the disk being disconnected due to a failure, I can consistently reproduce the following kernel panic :
Sleeping thread (tid 100024, pid 0) owns a non-sleepable lock
sched_switch() at sched_switch+0xf8
mi_switch() at mi_switch+0x16f
sleepq_timedwait() at sleepq_timedwait+0x42
_cv_timedwait() at _cv_timedwait+0x129
_sema_timedwait() at _sema_timedwait+0x55
ata_queue_request() at ata_queue_request+0x526
ata_controlcmd() at ata_controlcmd+0xa1
ata_setmode() at ata_setmode+0xdc
ad_init() at ad_init+0x27
ad_reinit() at ad_reinit+0x48
ata_reinit() at ata_reinit+0x268
ata_conn_event() at ata_conn_event+0x49
taskqueue_run() at taskqueue_run+0x93
taskqueue_thread_loop() at taskqueue_thread_loop+0x46
fork_exit() at fork_exit+0x118
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffff80000aad30, rbp = 0 ---
panic: sleeping thread
cpuid = 2
KDB: enter: panic
[thread pid 12 tid 100008 ]
Stopped at kdb_enter+0x3d: movq $0,0x4943d0(%rip)
db> bt
Tracing pid 12 tid 100008 td 0xffffff000187e000
kdb_enter() at kdb_enter+0x3d
panic() at panic+0x17b
turnstile_adjust() at turnstile_adjust
turnstile_wait() at turnstile_wait+0x1aa
_mtx_lock_sleep() at _mtx_lock_sleep+0xb0
softclock() at softclock+0x2a9
intr_event_execute_handlers() at intr_event_execute_handlers+0xfd
ithread_loop() at ithread_loop+0x8e
fork_exit() at fork_exit+0x118
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffff800005ad30, rbp = 0 ---
Even if the disk (used in a ZFS pool) is not accessed at all, it seems firing an ATA disconnection event will cause a kernel panic.
My dmesg output follows :
Copyright (c) 1992-2010 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 8.0-STABLE #0: Wed Feb 3 03:05:37 JST 2010
darksoul@eirei-no-za.yomi.darkbsd.org:/usr/storage/tech/eirei-no-za.yomi.darkbsd.org/usr/obj/usr/storage/tech/eirei-no-za.yomi.darkbsd.org/usr/src/sys/DARK-2010KERN amd64
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Core(TM)2 Quad CPU Q9400 @ 2.66GHz (2666.68-MHz K8-class CPU)
Origin = "GenuineIntel" Id = 0x1067a Stepping = 10
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=0x408e3fd<SSE3,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,XSAVE>
AMD Features=0x20100800<SYSCALL,NX,LM>
AMD Features2=0x1<LAHF>
TSC: P-state invariant
real memory = 8589934592 (8192 MB)
avail memory = 8257732608 (7875 MB)
ACPI APIC Table: <PTLTD APIC >
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
FreeBSD/SMP: 1 package(s) x 4 core(s)
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
cpu2 (AP): APIC ID: 2
cpu3 (AP): APIC ID: 3
ioapic0 <Version 2.0> irqs 0-23 on motherboard
ioapic1 <Version 2.0> irqs 24-47 on motherboard
kbd1 at kbdmux0
ichwd module loaded
iscsi: version 2.1.0
acpi0: <PTLTD XSDT> on motherboard
acpi0: [ITHREAD]
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x1008-0x100b on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib1: <ACPI PCI-PCI bridge> irq 16 at device 6.0 on pci0
pci3: <ACPI PCI bus> on pcib1
pcib2: <PCI-PCI bridge> at device 0.0 on pci3
pci4: <PCI bus> on pcib2
em0: <Intel(R) PRO/1000 Network Connection 6.9.14> port 0x2000-0x203f mem 0xdfd80000-0xdfd9ffff,0xdfd00000-0xdfd3ffff irq 16 at device 4.0 on pci4
em0: [FILTER]
em0: Ethernet address: 00:0e:0c:70:7d:1e
em1: <Intel(R) PRO/1000 Network Connection 6.9.14> port 0x2040-0x207f mem 0xdfda0000-0xdfdbffff,0xdfd40000-0xdfd7ffff irq 17 at device 4.1 on pci4
em1: [FILTER]
em1: Ethernet address: 00:0e:0c:70:7d:1f
pcib3: <PCI-PCI bridge> at device 0.2 on pci3
pci5: <PCI bus> on pcib3
em2: <Intel(R) PRO/1000 Network Connection 6.9.14> port 0x1820-0x183f mem 0xdff00000-0xdff1ffff,0xdff20000-0xdff20fff irq 16 at device 25.0 on pci0
em2: Using MSI interrupt
em2: [FILTER]
em2: Ethernet address: 00:30:48:de:84:88
uhci0: <Intel 82801I (ICH9) USB controller> port 0x1840-0x185f irq 16 at device 26.0 on pci0
uhci0: [ITHREAD]
usbus0: <Intel 82801I (ICH9) USB controller> on uhci0
uhci1: <Intel 82801I (ICH9) USB controller> port 0x1860-0x187f irq 17 at device 26.1 on pci0
uhci1: [ITHREAD]
usbus1: <Intel 82801I (ICH9) USB controller> on uhci1
uhci2: <Intel 82801I (ICH9) USB controller> port 0x1880-0x189f irq 18 at device 26.2 on pci0
uhci2: [ITHREAD]
usbus2: <Intel 82801I (ICH9) USB controller> on uhci2
ehci0: <Intel 82801I (ICH9) USB 2.0 controller> mem 0xdff22800-0xdff22bff irq 18 at device 26.7 on pci0
ehci0: [ITHREAD]
usbus3: EHCI version 1.0
usbus3: <Intel 82801I (ICH9) USB 2.0 controller> on ehci0
pcib4: <ACPI PCI-PCI bridge> irq 16 at device 28.0 on pci0
pci6: <ACPI PCI bus> on pcib4
pcib5: <ACPI PCI-PCI bridge> at device 0.0 on pci6
pci7: <ACPI PCI bus> on pcib5
atapci0: <Marvell 88SX6081 SATA300 controller> port 0x3000-0x30ff mem 0xdf200000-0xdf2fffff irq 24 at device 1.0 on pci7
atapci0: [ITHREAD]
ata2: <ATA channel 0> on atapci0
ata2: [ITHREAD]
ata3: <ATA channel 1> on atapci0
ata3: [ITHREAD]
ata4: <ATA channel 2> on atapci0
ata4: [ITHREAD]
ata5: <ATA channel 3> on atapci0
ata5: [ITHREAD]
ata6: <ATA channel 4> on atapci0
ata6: [ITHREAD]
ata7: <ATA channel 5> on atapci0
ata7: [ITHREAD]
ata8: <ATA channel 6> on atapci0
ata8: [ITHREAD]
ata9: <ATA channel 7> on atapci0
ata9: [ITHREAD]
atapci1: <Marvell 88SX6081 SATA300 controller> port 0x3400-0x34ff mem 0xdf300000-0xdf3fffff,0xdf800000-0xdfbfffff irq 28 at device 7.0 on pci7
atapci1: [ITHREAD]
ata10: <ATA channel 0> on atapci1
ata10: [ITHREAD]
ata11: <ATA channel 1> on atapci1
ata11: [ITHREAD]
ata12: <ATA channel 2> on atapci1
ata12: [ITHREAD]
ata13: <ATA channel 3> on atapci1
ata13: [ITHREAD]
ata14: <ATA channel 4> on atapci1
ata14: [ITHREAD]
ata15: <ATA channel 5> on atapci1
ata15: [ITHREAD]
ata16: <ATA channel 6> on atapci1
ata16: [ITHREAD]
ata17: <ATA channel 7> on atapci1
ata17: [ITHREAD]
uhci3: <Intel 82801I (ICH9) USB controller> port 0x18a0-0x18bf irq 23 at device 29.0 on pci0
uhci3: [ITHREAD]
usbus4: <Intel 82801I (ICH9) USB controller> on uhci3
uhci4: <Intel 82801I (ICH9) USB controller> port 0x18c0-0x18df irq 22 at device 29.1 on pci0
uhci4: [ITHREAD]
usbus5: <Intel 82801I (ICH9) USB controller> on uhci4
uhci5: <Intel 82801I (ICH9) USB controller> port 0x18e0-0x18ff irq 18 at device 29.2 on pci0
uhci5: [ITHREAD]
usbus6: <Intel 82801I (ICH9) USB controller> on uhci5
ehci1: <Intel 82801I (ICH9) USB 2.0 controller> mem 0xdff22c00-0xdff22fff irq 23 at device 29.7 on pci0
ehci1: [ITHREAD]
usbus7: EHCI version 1.0
usbus7: <Intel 82801I (ICH9) USB 2.0 controller> on ehci1
pcib6: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci17: <ACPI PCI bus> on pcib6
em3: <Intel(R) PRO/1000 Network Connection 6.9.14> port 0x4080-0x40bf mem 0xdfe00000-0xdfe1ffff irq 20 at device 0.0 on pci17
em3: [FILTER]
em3: Ethernet address: 00:07:e9:0f:a3:80
em4: <Intel(R) PRO/1000 Network Connection 6.9.14> port 0x40c0-0x40ff mem 0xdfe20000-0xdfe3ffff irq 21 at device 0.1 on pci17
em4: [FILTER]
em4: Ethernet address: 00:07:e9:0f:a3:81
vgapci0: <VGA-compatible display> port 0x4000-0x407f mem 0xde800000-0xdeffffff,0xdfe40000-0xdfe4ffff at device 1.0 on pci17
fwohci0: <Texas Instruments TSB43AB22/A> mem 0xdfe54000-0xdfe547ff,0xdfe50000-0xdfe53fff irq 22 at device 3.0 on pci17
fwohci0: [ITHREAD]
fwohci0: OHCI version 1.10 (ROM=1)
fwohci0: No. of Isochronous channels is 4.
fwohci0: EUI64 00:30:48:00:00:20:42:f6
fwohci0: Phy 1394a available S400, 2 ports.
fwohci0: Link S400, max_rec 2048 bytes.
firewire0: <IEEE1394(FireWire) bus> on fwohci0
dcons_crom0: <dcons configuration ROM> on firewire0
dcons_crom0: bus_addr 0x7c0a40
fwe0: <Ethernet over FireWire> on firewire0
if_fwe0: Fake Ethernet address: 02:30:48:20:42:f6
fwe0: Ethernet address: 02:30:48:20:42:f6
fwip0: <IP over FireWire> on firewire0
fwip0: Firewire address: 00:30:48:00:00:20:42:f6 @ 0xfffe00000000, S400, maxrec 2048
fwohci0: Initiate bus reset
fwohci0: fwohci_intr_core: BUS reset
fwohci0: fwohci_intr_core: node_id=0x00000000, SelfID Count=1, CYCLEMASTER mode
atapci2: <ITE IT8213F UDMA133 controller> port 0x4420-0x4427,0x4414-0x4417,0x4418-0x441f,0x4410-0x4413,0x4400-0x440f irq 23 at device 4.0 on pci17
atapci2: [ITHREAD]
ata18: <ATA channel 0> on atapci2
ata18: [ITHREAD]
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
ahci0: <Intel ICH9 AHCI SATA controller> port 0x1c70-0x1c77,0x1c64-0x1c67,0x1c68-0x1c6f,0x1c60-0x1c63,0x1c00-0x1c1f mem 0xdff22000-0xdff227ff irq 17 at device 31.2 on pci0
ahci0: [ITHREAD]
ahci0: AHCI v1.20 with 6 3Gbps ports, Port Multiplier supported
ahcich0: <AHCI channel> at channel 0 on ahci0
ahcich0: [ITHREAD]
ahcich1: <AHCI channel> at channel 1 on ahci0
ahcich1: [ITHREAD]
ahcich2: <AHCI channel> at channel 2 on ahci0
ahcich2: [ITHREAD]
ahcich3: <AHCI channel> at channel 3 on ahci0
ahcich3: [ITHREAD]
ahcich4: <AHCI channel> at channel 4 on ahci0
ahcich4: [ITHREAD]
ahcich5: <AHCI channel> at channel 5 on ahci0
ahcich5: [ITHREAD]
ichsmb0: <Intel 82801I (ICH9) SMBus controller> port 0x1100-0x111f mem 0xdff23000-0xdff230ff irq 17 at device 31.3 on pci0
ichsmb0: [ITHREAD]
smbus0: <System Management Bus> on ichsmb0
smb0: <SMBus generic I/O> on smbus0
pci0: <dasp> at device 31.6 (no driver attached)
acpi_button0: <Power Button> on acpi0
atrtc0: <AT realtime clock> port 0x70-0x71 irq 8 on acpi0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
atkbd0: [ITHREAD]
uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
uart0: [FILTER]
uart0: console (115200,n,8,1)
uart1: <16550 or compatible> port 0x2f8-0x2ff irq 3 on acpi0
uart1: [FILTER]
cpu0: <ACPI CPU> on acpi0
coretemp0: <CPU On-Die Thermal Sensors> on cpu0
est0: <Enhanced SpeedStep Frequency Control> on cpu0
p4tcc0: <CPU Frequency Thermal Control> on cpu0
cpu1: <ACPI CPU> on acpi0
coretemp1: <CPU On-Die Thermal Sensors> on cpu1
est1: <Enhanced SpeedStep Frequency Control> on cpu1
p4tcc1: <CPU Frequency Thermal Control> on cpu1
cpu2: <ACPI CPU> on acpi0
coretemp2: <CPU On-Die Thermal Sensors> on cpu2
est2: <Enhanced SpeedStep Frequency Control> on cpu2
p4tcc2: <CPU Frequency Thermal Control> on cpu2
cpu3: <ACPI CPU> on acpi0
coretemp3: <CPU On-Die Thermal Sensors> on cpu3
est3: <Enhanced SpeedStep Frequency Control> on cpu3
p4tcc3: <CPU Frequency Thermal Control> on cpu3
ichwd0: <Intel ICH9R watchdog timer> on isa0
ichwd0: Intel ICH9R watchdog timer (ICH9 or equivalent)
orm0: <ISA Option ROMs> at iomem 0xc0000-0xc7fff,0xc8000-0xc8fff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
ZFS filesystem version 3
ZFS storage pool version 14
Timecounters tick every 1.000 msec
Waiting 5 seconds for SCSI devices to settle
firewire0: 1 nodes, maxhop <= 0 cable IRM irm(0) (me)
firewire0: bus manager 0
usbus0: 12Mbps Full Speed USB v1.0
usbus1: 12Mbps Full Speed USB v1.0
usbus2: 12Mbps Full Speed USB v1.0
usbus3: 480Mbps High Speed USB v2.0
usbus4: 12Mbps Full Speed USB v1.0
usbus5: 12Mbps Full Speed USB v1.0
usbus6: 12Mbps Full Speed USB v1.0
usbus7: 480Mbps High Speed USB v2.0
ugen0.1: <Intel> at usbus0
uhub0: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus0
ugen1.1: <Intel> at usbus1
uhub1: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus1
ugen2.1: <Intel> at usbus2
uhub2: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus2
ugen3.1: <Intel> at usbus3
uhub3: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus3
ugen4.1: <Intel> at usbus4
uhub4: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus4
ugen5.1: <Intel> at usbus5
uhub5: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus5
ugen6.1: <Intel> at usbus6
uhub6: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus6
ugen7.1: <Intel> at usbus7
uhub7: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus7
ad4: 1430799MB <Seagate ST31500341AS CC1H> at ata2-master UDMA100 SATA 3Gb/s
ad6: 1430799MB <Seagate ST31500341AS CC1H> at ata3-master UDMA100 SATA 3Gb/s
ad8: 1430799MB <Seagate ST31500341AS CC1H> at ata4-master UDMA100 SATA 3Gb/s
ad10: 1430799MB <Seagate ST31500341AS CC1H> at ata5-master UDMA100 SATA 3Gb/s
uhub0: 2 ports with 2 removable, self powered
uhub1: 2 ports with 2 removable, self powered
uhub2: 2 ports with 2 removable, self powered
uhub4: 2 ports with 2 removable, self powered
uhub5: 2 ports with 2 removable, self powered
uhub6: 2 ports with 2 removable, self powered
ad12: 61136MB <TS64GSSD25S M V090216> at ata6-master UDMA100 SATA 3Gb/s
ad14: 1430799MB <Seagate ST31500341AS CC1H> at ata7-master UDMA100 SATA 3Gb/s
ad16: 1430799MB <Seagate ST31500341AS CC1H> at ata8-master UDMA100 SATA 3Gb/s
ad18: 1430799MB <Seagate ST31500341AS CC1H> at ata9-master UDMA100 SATA 3Gb/s
ad28: 1430799MB <Seagate ST31500341AS CC1H> at ata14-master UDMA100 SATA 3Gb/s
ad30: 1430799MB <Seagate ST31500341AS CC1H> at ata15-master UDMA100 SATA 3Gb/s
ad32: 1430799MB <Seagate ST31500341AS CC1H> at ata16-master UDMA100 SATA 3Gb/s
ad34: 1430799MB <Seagate ST31500341AS CC1H> at ata17-master UDMA100 SATA 3Gb/s
ata18: DMA limited to UDMA33, controller found non-ATA66 cable
ad36: 3823MB <TRANSCEND 20070831> at ata18-master UDMA33
ad37: 61136MB <TS64GSSD25 M V090331> at ata18-slave UDMA133
uhub3: 6 ports with 6 removable, self powered
uhub7: 6 ports with 6 removable, self powered
ugen7.2: <Generic> at usbus7
umass0: <Generic External, class 0/0, rev 2.00/1.04, addr 2> on usbus7
umass0: SCSI over Bulk-Only; quirks = 0x0000
umass0:6:0:-1: Attached to scbus6
ugen0.2: <Chicony> at usbus0
uhub8: <Chicony Generic USB Hub, class 9/0, rev 1.10/1.00, addr 2> on usbus0
ada0 at ahcich0 bus 0 scbus0 target 0 lun 0
ada0: da0 at umass-sim0 bus 0 scbus6 target 0 lun 0
da0: <Generic External 1.04> Fixed Direct Access SCSI-4 device
da0: 40.000MB/s transfers
da0: 1430799MB (2930277168 512 byte sectors: 255H 63S/T 182401C)
<ST31500341AS CC1H> ATA-8 SATA 2.x device
ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO size 8192bytes)
ada0: Command Queueing enabled
ada0: 1430799MB (2930277168 512 byte sectors: 16H 63S/T 16383C)
ada1 at ahcich1 bus 0 scbus1 target 0 lun 0
ada1: <ST31500341AS CC1H> ATA-8 SATA 2.x device
ada1: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO size 8192bytes)
ada1: Command Queueing enabled
ada1: 1430799MB (2930277168 512 byte sectors: 16H 63S/T 16383C)
ada2 at ahcich2 bus 0 scbus2 target 0 lun 0
ada2: <ST31500341AS CC1H> ATA-8 SATA 2.x device
ada2: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO size 8192bytes)
ada2: Command Queueing enabled
ada2: 1430799MB (2930277168 512 byte sectors: 16H 63S/T 16383C)
ada3 at ahcich3 bus 0 scbus3 target 0 lun 0
ada3: <ST31500341AS SD1A> ATA-8 SATA 2.x device
ada3: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO size 8192bytes)
ada3: Command Queueing enabled
ada3: 1430799MB (2930277168 512 byte sectors: 16H 63S/T 16383C)
SMP: AP CPU #1 Launched!
SMP: AP CPU #3 Launched!
SMP: AP CPU #2 Launched!
Root mount waiting for: usbus7
uhub8: 3 ports with 2 removable, bus powered
ugen7.3: <vendor 0x05e3> at usbus7
uhub9: <vendor 0x05e3 USB2.0 Hub, class 9/0, rev 2.00/7.02, addr 3> on usbus7
ugen0.3: <Chicony> at usbus0
ukbd0: <Chicony PFU-68 USB Keyboard, class 0/0, rev 1.10/1.00, addr 3> on usbus0
kbd2 at ukbd0
uhub9: 4 ports with 4 removable, self powered
Root mount waiting for: usbus7
ugen7.4: <Generic> at usbus7
umass1: <Generic External, class 0/0, rev 2.00/1.04, addr 4> on usbus7
umass1: SCSI over Bulk-Only; quirks = 0x0000
Root mount waiting for: usbus7
umass1:7:1:-1: Attached to scbus7
da1 at umass-sim1 bus 1 scbus7 target 0 lun 0
da1: <Generic External 1.04> Fixed Direct Access SCSI-4 device
da1: 40.000MB/s transfers
da1: 1430799MB (2930277168 512 byte sectors: 255H 63S/T 182401C)
ugen7.5: <vendor 0x05e3> at usbus7
uhub10: <vendor 0x05e3 USB2.0 Hub, class 9/0, rev 2.00/7.02, addr 5> on usbus7
Root mount waiting for: usbus7
uhub10: 4 ports with 4 removable, self powered
Trying to mount root from zfs:prana
em0: link state changed to UP
em1: link state changed to UP
>How-To-Repeat:
I noticed the problem when seeing device failures such as : ad24 detached, ad22 detached.
I could consistently reproduce it (same error message, same thread, same backtrace) by unplugging a drive while the machine was running. (This worked fine with FreeBSD 7.X)
>Fix:
More like a work-around, but moving drives to the internal AHCI controller on my motherboard fixed the flapping problem, and removed the trigger for the above kernel panic.
>Release-Note:
>Audit-Trail:
>Unformatted:
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