Bug 219375 - vm_fault: fault on nofault entry, addr: fffffe001ff0a000
Summary: vm_fault: fault on nofault entry, addr: fffffe001ff0a000
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: 11.0-RELEASE
Hardware: amd64 Any
: --- Affects Only Me
Assignee: freebsd-bugs mailing list
URL:
Keywords: regression
Depends on:
Blocks:
 
Reported: 2017-05-18 12:10 UTC by Bob Frazier
Modified: 2017-06-27 17:45 UTC (History)
0 users

See Also:


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Description Bob Frazier 2017-05-18 12:10:46 UTC
received kernel panic and coredump on newly built system (old hardware, ran FBSD 8-STABLE for years).

  vm_fault: fault on nofault entry, addr: fffffe001ff0a000

I was attempting to open a web page (in firefox) from a link in thunderbird.  Firefox was already running at the time, with several windows on different virtual desktops (using mate) showing multiple web pages per window.

There was also a linux VM running in virtualbox (with ~2G RAM assigned to it).

The new packages have been recently installed using 'pkg' based on 11-RELEASE.

I have seen what I believe to be crashes that are related to video before, when running 8-STABLE (with ports from over 2 years ago).  This is one of the reasons I re-built the system from scratch on a new hard drive, entirely on ZFS.


uname output:

FreeBSD hack.SFT.local 11.0-RELEASE-p1 FreeBSD 11.0-RELEASE-p1 #0 r306420: Thu Sep 29 01:43:23 UTC 2016     root@releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64


these are the loaded kernel modules:

Id Refs Address            Size     Name
 1   39 0xffffffff80200000 1fa7c38  kernel
 2    1 0xffffffff821a9000 30aec0   zfs.ko
 3    2 0xffffffff824b4000 adc0     opensolaris.ko
 4    1 0xffffffff82621000 4cd3     cuse4bsd.ko
 5    3 0xffffffff82626000 4feed    vboxdrv.ko
 6    2 0xffffffff82676000 2a1f     vboxnetflt.ko
 7    2 0xffffffff82679000 befc     netgraph.ko
 8    1 0xffffffff82685000 423b     ng_ether.ko
 9    1 0xffffffff8268a000 3f86     vboxnetadp.ko
10    2 0xffffffff8268e000 3de40    linux.ko
11    2 0xffffffff826cc000 7b08     linux_common.ko
12    1 0xffffffff826d4000 389f4    linux64.ko
13    1 0xffffffff8270d000 2c0a     coretemp.ko
14    1 0xffffffff82710000 964559   nvidia.ko


This is the dmesg output (in its entirety) related to the crash/dump.  I included everything since it has some information in it that might be helpful.

Copyright (c) 1992-2016 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 11.0-RELEASE-p1 #0 r306420: Thu Sep 29 01:43:23 UTC 2016
    root@releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64
FreeBSD clang version 3.8.0 (tags/RELEASE_380/final 262564) (based on LLVM 3.8.0)
VT(vga): resolution 640x480
CPU: Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz (2400.13-MHz K8-class CPU)
  Origin="GenuineIntel"  Id=0x6fb  Family=0x6  Model=0xf  Stepping=11
  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=0xe3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM>
  AMD Features=0x20100800<SYSCALL,NX,LM>
  AMD Features2=0x1<LAHF>
  VT-x: HLT,PAUSE
  TSC: P-state invariant, performance statistics
real memory  = 8589934592 (8192 MB)
avail memory = 8254439424 (7872 MB)
Event timer "LAPIC" quality 400
ACPI APIC Table: <GBT    GBTUACPI>
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
FreeBSD/SMP: 1 package(s) x 4 core(s)
random: unblocking device.
ioapic0: Changing APIC ID to 2
ioapic0 <Version 2.0> irqs 0-23 on motherboard
random: entropy device external interface
kbd1 at kbdmux0
netmap: loaded module
module_register_init: MOD_LOAD (vesa, 0xffffffff8101c950, 0) error 19
vtvga0: <VT VGA driver> on motherboard
cryptosoft0: <software crypto> on motherboard
acpi0: <GBT GBTUACPI> on motherboard
acpi0: Power Button (fixed)
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
attimer0: <AT timer> port 0x40-0x43 on acpi0
Timecounter "i8254" frequency 1193182 Hz quality 0
Event timer "i8254" frequency 1193182 Hz quality 100
hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff irq 0,8 on acpi0
Timecounter "HPET" frequency 14318180 Hz quality 950
Event timer "HPET" frequency 14318180 Hz quality 450
Event timer "HPET1" frequency 14318180 Hz quality 440
Event timer "HPET2" frequency 14318180 Hz quality 440
Event timer "HPET3" frequency 14318180 Hz quality 440
atrtc0: <AT realtime clock> port 0x70-0x73 on acpi0
Event timer "RTC" frequency 32768 Hz quality 0
Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x408-0x40b on acpi0
acpi_button0: <Power Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib1: <PCI-PCI bridge> irq 16 at device 6.0 on pci0
pci1: <PCI bus> on pcib1
vgapci0: <VGA-compatible display> port 0xa000-0xa07f mem 0xe6000000-0xe6ffffff,0xd0000000-0xdfffffff,0xe4000000-0xe5ffffff irq 16 at device 0.0 on pci1
vgapci0: Boot video device
uhci0: <Intel 82801JI (ICH10) USB controller USB-D> port 0xe000-0xe01f irq 16 at device 26.0 on pci0
uhci0: LegSup = 0x2f00
usbus0 on uhci0
uhci1: <Intel 82801JI (ICH10) USB controller USB-E> port 0xe100-0xe11f irq 21 at device 26.1 on pci0
uhci1: LegSup = 0x2f00
usbus1 on uhci1
uhci2: <Intel 82801JI (ICH10) USB controller USB-F> port 0xe200-0xe21f irq 18 at device 26.2 on pci0
uhci2: LegSup = 0x2f00
usbus2 on uhci2
ehci0: <Intel 82801JI (ICH10) USB 2.0 controller USB-B> mem 0xeb305000-0xeb3053ff irq 18 at device 26.7 on pci0
usbus3: EHCI version 1.0
usbus3 on ehci0
hdac0: <Intel 82801JI HDA Controller> mem 0xeb300000-0xeb303fff irq 22 at device 27.0 on pci0
pcib2: <ACPI PCI-PCI bridge> irq 16 at device 28.0 on pci0
pcib2: [GIANT-LOCKED]
pcib3: <ACPI PCI-PCI bridge> irq 19 at device 28.3 on pci0
pcib3: [GIANT-LOCKED]
pci2: <ACPI PCI bus> on pcib3
atapci0: <JMicron JMB368 UDMA133 controller> port 0xb000-0xb007,0xb100-0xb103,0xb200-0xb207,0xb300-0xb303,0xb400-0xb40f irq 19 at device 0.0 on pci2
ata2: <ATA channel> at channel 0 on atapci0
pcib4: <ACPI PCI-PCI bridge> irq 16 at device 28.4 on pci0
pcib4: [GIANT-LOCKED]
pci3: <ACPI PCI bus> on pcib4
re0: <RealTek 8168/8111 B/C/CP/D/DP/E/F/G PCIe Gigabit Ethernet> port 0xc000-0xc0ff mem 0xeb010000-0xeb010fff,0xeb000000-0xeb00ffff irq 16 at device 0.0 on pci3
re0: Using 1 MSI-X message
re0: Chip rev. 0x3c000000
re0: MAC rev. 0x00400000
miibus0: <MII bus> on re0
rgephy0: <RTL8169S/8110S/8211 1000BASE-T media interface> PHY 1 on miibus0
rgephy0:  none, 10baseT, 10baseT-FDX, 10baseT-FDX-flow, 100baseTX, 100baseTX-FDX, 100baseTX-FDX-flow, 1000baseT, 1000baseT-master, 1000baseT-FDX, 1000baseT-FDX-master, 1000baseT-FDX-flow, 1000baseT-FDX-flow-master, auto, auto-flow
re0: Using defaults for TSO: 65518/35/2048
re0: Ethernet address: 00:1f:d0:2d:d5:ba
re0: netmap queues/slots: TX 1/256, RX 1/256
pcib5: <ACPI PCI-PCI bridge> irq 17 at device 28.5 on pci0
pcib5: [GIANT-LOCKED]
pci4: <ACPI PCI bus> on pcib5
re1: <RealTek 8168/8111 B/C/CP/D/DP/E/F/G PCIe Gigabit Ethernet> port 0xd000-0xd0ff mem 0xeb110000-0xeb110fff,0xeb100000-0xeb10ffff irq 17 at device 0.0 on pci4
re1: Using 1 MSI-X message
re1: Chip rev. 0x3c000000
re1: MAC rev. 0x00400000
miibus1: <MII bus> on re1
rgephy1: <RTL8169S/8110S/8211 1000BASE-T media interface> PHY 1 on miibus1
rgephy1:  none, 10baseT, 10baseT-FDX, 10baseT-FDX-flow, 100baseTX, 100baseTX-FDX, 100baseTX-FDX-flow, 1000baseT, 1000baseT-master, 1000baseT-FDX, 1000baseT-FDX-master, 1000baseT-FDX-flow, 1000baseT-FDX-flow-master, auto, auto-flow
re1: Using defaults for TSO: 65518/35/2048
re1: Ethernet address: 00:1f:d0:2d:d5:d9
re1: netmap queues/slots: TX 1/256, RX 1/256
uhci3: <Intel 82801JI (ICH10) USB controller USB-A> port 0xe300-0xe31f irq 23 at device 29.0 on pci0
uhci3: LegSup = 0x2f00
usbus4 on uhci3
uhci4: <Intel 82801JI (ICH10) USB controller USB-B> port 0xe400-0xe41f irq 19 at device 29.1 on pci0
uhci4: LegSup = 0x2f00
usbus5 on uhci4
uhci5: <Intel 82801JI (ICH10) USB controller USB-C> port 0xe500-0xe51f irq 18 at device 29.2 on pci0
uhci5: LegSup = 0x2f00
usbus6 on uhci5
ehci1: <Intel 82801JI (ICH10) USB 2.0 controller USB-A> mem 0xeb304000-0xeb3043ff irq 23 at device 29.7 on pci0
usbus7: EHCI version 1.0
usbus7 on ehci1
pcib6: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci5: <ACPI PCI bus> on pcib6
pci5: <serial bus, FireWire> at device 7.0 (no driver attached)
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci1: <Intel ICH10 SATA300 controller> port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xf000-0xf00f,0xf100-0xf10f at device 31.2 on pci0
ata0: <ATA channel> at channel 0 on atapci1
ata1: <ATA channel> at channel 1 on atapci1
atapci2: <Intel ICH10 SATA300 controller> port 0xe700-0xe707,0xe800-0xe803,0xe900-0xe907,0xea00-0xea03,0xeb00-0xeb0f,0xec00-0xec0f irq 19 at device 31.5 on pci0
ata3: <ATA channel> at channel 0 on atapci2
ata4: <ATA channel> at channel 1 on atapci2
uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
ppc0: <Parallel port> port 0x378-0x37f,0x778-0x77b irq 7 drq 3 on acpi0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/16 bytes threshold
ppbus0: <Parallel port bus> on ppc0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: model IntelliMouse, device ID 3
acpi_perf0: <ACPI CPU Frequency Control> on cpu0
est1: <Enhanced SpeedStep Frequency Control> on cpu1
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 9250925060c0625
device_attach: est1 attach returned 6
est2: <Enhanced SpeedStep Frequency Control> on cpu2
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 9250925060c0625
device_attach: est2 attach returned 6
est3: <Enhanced SpeedStep Frequency Control> on cpu3
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 9250925060c0625
device_attach: est3 attach returned 6
usbus0: 12Mbps Full Speed USB v1.0
ZFS filesystem version: 5
ZFS storage pool version: features support (5000)
Timecounters tick every 1.000 msec
nvme cam probe device init
hdacc0: <Realtek ALC889A HDA CODEC> at cad 2 on hdac0
hdaa0: <Realtek ALC889A Audio Function Group> at nid 1 on hdacc0
pcm0: <Realtek ALC889A (Rear Analog 7.1/2.0)> at nid 20,22,21,23 and 24,26 on hdaa0
pcm1: <Realtek ALC889A (Front Analog)> at nid 27 and 25 on hdaa0
pcm2: <Realtek ALC889A (Rear Digital)> at nid 30 and 31 on hdaa0
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
ugen1.1: <Intel> at usbus1
uhub0: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus1
ugen0.1: <Intel> at usbus0
uhub1: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus0
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
usbus5: 12Mbps Full Speed USB v1.0
usbus6: 12Mbps Full Speed USB v1.0
usbus7: 480Mbps High Speed USB v2.0
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
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
ada0 at ata0 bus 0 scbus1 target 0 lun 0
ada0: <WDC WD2003FYPS-27Y2B0 04.05G11> ATA8-ACS SATA 2.x device
ada0: Serial Number WD-WCAVY7180271
ada0: 300.000MB/s transfers (SATA 2.x, UDMA5, PIO 8192bytes)
ada0: 1907728MB (3907027055 512 byte sectors)
ada1 at ata0 bus 0 scbus1 target 1 lun 0
ada1: <MAXTOR STM3500630AS 3.AAE> ATA-7 SATA 1.x device
ada1: Serial Number 9QG7YY78
ada1: 150.000MB/s transfers (SATA 1.x, UDMA5, PIO 8192bytes)
ada1: 476940MB (976773168 512 byte sectors)
ada2 at ata3 bus 0 scbus3 target 0 lun 0
ada2: <Hitachi HDS721010CLA332 JP4OA39C> ATA8-ACS SATA 2.x device
ada2: Serial Number JP2921HQ23DVBA
ada2: 300.000MB/s transfers (SATA 2.x, UDMA5, PIO 8192bytes)
ada2: 953869MB (1953525168 512 byte sectors)
cd0 at ata1 bus 0 scbus2 target 0 lun 0
SMP: AP CPU #3 Launched!
SMP: AP CPU #2 Launched!
SMP: AP CPU #1 Launched!
cd0: <ATAPI DVD D  DH16D2S EP53> Removable CD-ROM SCSI device
cd0: 150.000MB/s transfers (SATA 1.x, UDMA5, ATAPI 12bytes, PIO 8192bytes)
cd0: Attempt to query device size failed: NOT READY, Medium not present - tray closed
Timecounter "TSC-low" frequency 1200066277 Hz quality 1000
Trying to mount root from zfs:zroot/ROOT/default []...
Root mount waiting for: usbus7 usbus3
Root mount waiting for: usbus7 usbus3
uhub7: 6 ports with 6 removable, self powered
uhub3: 6 ports with 6 removable, self powered
Cuse4BSD v0.1.36 @ /dev/cuse
re0: link state changed to DOWN
re0: link state changed to UP
re1: link state changed to DOWN
vboxdrv: fAsync=0 offMin=0x52b offMax=0x164a
coretemp0: <CPU On-Die Thermal Sensors> on cpu0
coretemp1: <CPU On-Die Thermal Sensors> on cpu1
est1: <Enhanced SpeedStep Frequency Control> on cpu1
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 9250925060c0625
device_attach: est1 attach returned 6
coretemp2: <CPU On-Die Thermal Sensors> on cpu2
est2: <Enhanced SpeedStep Frequency Control> on cpu2
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 9250925060c0625
device_attach: est2 attach returned 6
coretemp3: <CPU On-Die Thermal Sensors> on cpu3
est3: <Enhanced SpeedStep Frequency Control> on cpu3
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 9250925060c0625
device_attach: est3 attach returned 6
WARNING: /32-bit was not properly dismounted
WARNING: /32-bit/tmp was not properly dismounted
WARNING: /32-bit/var was not properly dismounted
WARNING: /32-bit/usr was not properly dismounted
WARNING: /32-bit/d-drive was not properly dismounted
nvidia0: <GeForce 9600 GT> on vgapci0
vgapci0: child nvidia0 requested pci_enable_io
vgapci0: child nvidia0 requested pci_enable_io
WARNING: /old/var was not properly dismounted
WARNING: /old/tmp was not properly dismounted
WARNING: /old/usr was not properly dismounted
WARNING: /old/e-drive was not properly dismounted
vboxnet0: Ethernet address: 0a:00:27:00:00:00
vboxdrv: ffffffff83075020 VMMR0.r0
vboxdrv: ffffffff8317a020 VBoxDDR0.r0
pid 10579 (mate-system-monitor), uid 103: exited on signal 5
re0: promiscuous mode enabled
re0: promiscuous mode disabled
panic: vm_fault: fault on nofault entry, addr: fffffe001ff0a000
cpuid = 0
KDB: stack backtrace:
#0 0xffffffff80b24077 at kdb_backtrace+0x67
#1 0xffffffff80ad93e2 at vpanic+0x182
#2 0xffffffff80ad9253 at panic+0x43
#3 0xffffffff80e12601 at vm_fault_hold+0x2721
#4 0xffffffff80e0fe98 at vm_fault+0x78
#5 0xffffffff80fa0e39 at trap_pfault+0xf9
#6 0xffffffff80fa04cc at trap+0x26c
#7 0xffffffff80f84141 at calltrap+0x8
Uptime: 22h46m49s
Dumping 3688 out of 8155 MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%


info file on crash dump:
Dump header from device: /dev/ada0p2
  Architecture: amd64
  Architecture Version: 2
  Dump Length: 3867783168
  Blocksize: 512
  Dumptime: Thu May 18 03:42:48 2017
  Hostname: hack.SFT.local
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 11.0-RELEASE-p1 #0 r306420: Thu Sep 29 01:43:23 UTC 2016
    root@releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC
  Panic String: vm_fault: fault on nofault entry, addr: fffffe001ff0a000
  Dump Parity: 3670130591
  Bounds: 1
  Dump Status: good


VIDEO INFORMATION

The nvidia kernel driver is x11/nvidia-driver-340  (necessary since I have an older graphics card).

in Xorg.0.log (the one running now) the NVidia display is reported as follows:

[   505.906] (II) NVIDIA(0): NVIDIA GPU GeForce 9600 GT (G94) at PCI:1:0:0 (GPU-0)
[   505.906] (--) NVIDIA(0): Memory: 524288 kBytes
[   505.906] (--) NVIDIA(0): VideoBIOS: 62.94.0d.00.71
[   505.906] (II) NVIDIA(0): Detected PCI Express Link width: 16X

The video adapter is pretty old.  It dates back from around 2008.  The CPU is the same age.  The motherboard is a year newer and the RAM was replaced a few years ago.


RELATED OBSERVATIONS

I have observed crashes in 8-STABLE before, usually associated with doing things like switching out of full screen video mode.  However the crashes back then were somewhat random.

Another possibly related problem is that swap space would occasionally be allocated (and not free'd up), with no indication as to which application had done it.  Usually it would be about 5% of the available (8G) swap space.  In 8-STABLE, when this happend, the system could go weeks without crashing.  However, I don't recall whether swap space was never allocated when the system crashed.

In short this problem could have been present for years.  It could also be hardware related.  It could have something to do with a kernel module that incorrectly allocates pages (or corrupts the page table), sometimes resulting in swap space being allocated for no reason.

I have observed the swap space phenomenon ONCE with this new 11-RELEASE kernel.

I plan on updating kernel/world with the latest 11-STABLE once I have finished putting everything back where it was (more or less) under 8.  If it happens again I will annotate it in this bug report.


(I wasn't able to get any really useful information out of kgdb; however, I will keep the core dump file handy in case you need it)
Comment 1 Bob Frazier 2017-06-27 17:45:11 UTC
It appears that one other factor may be involved.

As I recall, the problem is NOT showing up when the icecast server isn't running, while being fed an audio stream by 'ices'.

Often I was leaving this running even when I wasn't listening to the stream on a streaming radio that's on my LAN.  However, lately, I've been shutting off the audio feed by killing 'ices' (icecast remains running).

The installed packages are:  icecast2-2.4.3,1  ices-2.0.2_3,1

In the past I have seen some odd performance-related problems with transferring large amounts of data over 'localhost', with applications like iperf (stalls, lost packets and 'out of buffer space' and similar problems, basically).  I have not attempted to reproduce this in FBSD-11 however, but if the stack hasn't changed much this COULD be related.

When ices feeds icecast with content, I'm pretty sure it uses localhost to do it.  If not, it's probably using a socket or a pipe.  Whichever case this is, it's running for DAYS or even WEEKS sometimes, possibly with leakage, or internal corruption, or something else.

A typical trigger for the reported problem is a video-related event, such as switching from full screen video back to whatever video mode the GUI is using.  In a few cases it has been caused by attempting to open up a new firefox window or a new tab within firefox (i.e. following a link from something else, such as an e-mail).

It's possible that it's "the trigger" PLUS the socket/pipe/whatever that ices+icecast is using.

It's also possible that it's just creating a rare condition within memory or the kernel configuration that surfaces a bug.

But if it _IS_ network stack related, particularly with the 'localhost' adaptor, then this information might be helpful in isolating a potentially big problem.