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Date: Tue, 11 Sep 2012 20:40:42 GMT
From: "Paul G Webster 'daemon'" <paul.g.webster@googlemail.com>
To: freebsd-gnats-submit@FreeBSD.org
Subject: rtorrent + ZFS 200% WCPU/kqread deadlock
X-Send-Pr-Version: www-3.1
X-GNATS-Notify:

>Number:         171557
>Category:       ports
>Synopsis:       net-p2p/rtorrent + ZFS 200% WCPU/kqread deadlock
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    flz
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Sep 11 20:50:01 UTC 2012
>Closed-Date:    Wed Oct 24 08:19:03 UTC 2012
>Last-Modified:  Wed Oct 24 08:19:03 UTC 2012
>Originator:     Paul G Webster 'daemon'
>Release:        9.0-RELEASE
>Organization:
CloudCow
>Environment:
FreeBSD web.interflective.com 9.0-RELEASE-p3 FreeBSD 9.0-RELEASE-p3 #0: Mon Jun 18 10:38:19 UTC 2012     sysadmin@container.interflective.com:/usr/obj/usr/src/sys/KERN0  amd64
>Description:
System spec: Supermicro 8/core,

container# cat /var/run/dmesg.boot | grep -i cpu
CPU: Intel(R) Xeon(R) CPU           X3450  @ 2.67GHz (2666.72-MHz K8-class CPU)
FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs

container# cat /var/run/dmesg.boot | grep -i mem
real memory  = 17179869184 (16384 MB)
avail memory = 16509493248 (15744 MB)

Filesystem: ZFS (THIS IS IMPORTANT, This bug does not appear to occur on ufs!)

rtorrent is compiled with default options as is libtorrent.

upon entering the magnet: information and loading the torrent the following will occur:

92582 paul         3  21    0 61228K  9864K kqread  0   1:52 200.00% rtorrent

rtorrent will be unresponsive for a time of 2-5 minutes, then will appear to be functioning correctly, the download begins. After a random time 2-3 minutes it will re enter a deadlock kqread/200% state and be unresponsive once again. In this state rtorrent will not function at all to any keyboard commands and kill -9 will be required to abort it, a standard kill will not be sufficient. 

I have also tried compiling libtorrent without KQREAD, it shows the same behavior.

This issue is not isolated either, I have been speaking with others in the same boat on irc.freenode.net ##freebsd, they got around the problem by downgrading to the 8.x branch of rtorrent.
>How-To-Repeat:
install rtorrent & libtorrent on a ZFS based 9.0-release system and download anything. 
>Fix:


Patch attached with submission follows:

Copyright (c) 1992-2012 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 9.0-RELEASE-p3 #0: Mon Jun 18 10:38:19 UTC 2012
    sysadmin@container.interflective.com:/usr/obj/usr/src/sys/KERN0 amd64
CPU: Intel(R) Xeon(R) CPU           X3450  @ 2.67GHz (2666.72-MHz K8-class CPU)
  Origin = "GenuineIntel"  Id = 0x106e5  Family = 6  Model = 1e  Stepping = 5
  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=0x98e3fd<SSE3,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT>
  AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
  AMD Features2=0x1<LAHF>
  TSC: P-state invariant, performance statistics
real memory  = 17179869184 (16384 MB)
avail memory = 16509493248 (15744 MB)
Event timer "LAPIC" quality 400
ACPI APIC Table: <052710 APIC1452>
FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs
FreeBSD/SMP: 1 package(s) x 4 core(s) x 2 SMT threads
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  2
 cpu3 (AP): APIC ID:  3
 cpu4 (AP): APIC ID:  4
 cpu5 (AP): APIC ID:  5
 cpu6 (AP): APIC ID:  6
 cpu7 (AP): APIC ID:  7
ioapic0: Changing APIC ID to 8
ioapic0 <Version 2.0> irqs 0-23 on motherboard
kbd1 at kbdmux0
acpi0: <SMCI > on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0
cpu0: <ACPI CPU> on acpi0
ACPI Warning: Incorrect checksum in table [OEMB] - 0xA2, should be 0x9F (20110527/tbutils-282)
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
cpu4: <ACPI CPU> on acpi0
cpu5: <ACPI CPU> on acpi0
cpu6: <ACPI CPU> on acpi0
cpu7: <ACPI CPU> 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 3.0 on pci0
pci1: <ACPI PCI bus> on pcib1
pci0: <base peripheral> at device 8.0 (no driver attached)
pci0: <base peripheral> at device 8.1 (no driver attached)
pci0: <base peripheral> at device 8.2 (no driver attached)
pci0: <base peripheral> at device 8.3 (no driver attached)
pci0: <base peripheral> at device 16.0 (no driver attached)
pci0: <base peripheral> at device 16.1 (no driver attached)
ehci0: <Intel PCH USB 2.0 controller USB-B> mem 0xfb4fc000-0xfb4fc3ff irq 21 at device 26.0 on pci0
usbus0: EHCI version 1.0
usbus0: <Intel PCH USB 2.0 controller USB-B> on ehci0
pcib2: <ACPI PCI-PCI bridge> irq 17 at device 28.0 on pci0
pci2: <ACPI PCI bus> on pcib2
pcib3: <ACPI PCI-PCI bridge> irq 17 at device 28.4 on pci0
pci3: <ACPI PCI bus> on pcib3
em0: <Intel(R) PRO/1000 Network Connection 7.2.3> port 0xdc00-0xdc1f mem 0xfb5e0000-0xfb5fffff,0xfb5dc000-0xfb5dffff irq 16 at device 0.0 on pci3
em0: Using MSIX interrupts with 3 vectors
em0: Ethernet address: 00:25:90:35:49:e4
pcib4: <ACPI PCI-PCI bridge> irq 16 at device 28.5 on pci0
pci4: <ACPI PCI bus> on pcib4
em1: <Intel(R) PRO/1000 Network Connection 7.2.3> port 0xec00-0xec1f mem 0xfb6e0000-0xfb6fffff,0xfb6dc000-0xfb6dffff irq 17 at device 0.0 on pci4
em1: Using MSIX interrupts with 3 vectors
em1: Ethernet address: 00:25:90:35:49:e5
ehci1: <Intel PCH USB 2.0 controller USB-A> mem 0xfb4fa000-0xfb4fa3ff irq 23 at device 29.0 on pci0
usbus1: EHCI version 1.0
usbus1: <Intel PCH USB 2.0 controller USB-A> on ehci1
pcib5: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci5: <ACPI PCI bus> on pcib5
vgapci0: <VGA-compatible display> mem 0xfa000000-0xfaffffff,0xfb7fc000-0xfb7fffff,0xfb800000-0xfbffffff irq 23 at device 3.0 on pci5
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
ahci0: <Intel 5 Series/3400 Series AHCI SATA controller> port 0xc400-0xc407,0xcc00-0xcc03,0xc880-0xc887,0xc800-0xc803,0xc480-0xc49f mem 0xfb4f8000-0xfb4f87ff irq 19 at device 31.2 on pci0
ahci0: AHCI v1.30 with 6 3Gbps ports, Port Multiplier not supported
ahcich0: <AHCI channel> at channel 0 on ahci0
ahcich1: <AHCI channel> at channel 1 on ahci0
ahcich2: <AHCI channel> at channel 2 on ahci0
ahcich3: <AHCI channel> at channel 3 on ahci0
ahcich4: <AHCI channel> at channel 4 on ahci0
ahcich5: <AHCI channel> at channel 5 on ahci0
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
acpi_button0: <Power Button> on acpi0
attimer0: <AT timer> port 0x40-0x43 irq 0 on acpi0
Timecounter "i8254" frequency 1193182 Hz quality 0
Event timer "i8254" frequency 1193182 Hz quality 100
atrtc0: <AT realtime clock> port 0x70-0x71 irq 8 on acpi0
Event timer "RTC" frequency 32768 Hz quality 0
uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
uart1: <16550 or compatible> port 0x2f8-0x2ff irq 3 on acpi0
uart2: <16550 or compatible> port 0x3e8-0x3ef irq 5 on acpi0
hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 14318180 Hz quality 950
Event timer "HPET" frequency 14318180 Hz quality 550
orm0: <ISA Option ROM> at iomem 0xc0000-0xc7fff 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
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
ppc0: cannot reserve I/O port range
est0: <Enhanced SpeedStep Frequency Control> on cpu0
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 14
device_attach: est0 attach returned 6
p4tcc0: <CPU Frequency Thermal Control> on cpu0
est1: <Enhanced SpeedStep Frequency Control> on cpu1
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 14
device_attach: est1 attach returned 6
p4tcc1: <CPU Frequency Thermal Control> on cpu1
est2: <Enhanced SpeedStep Frequency Control> on cpu2
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 14
device_attach: est2 attach returned 6
p4tcc2: <CPU Frequency Thermal Control> on cpu2
est3: <Enhanced SpeedStep Frequency Control> on cpu3
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 14
device_attach: est3 attach returned 6
p4tcc3: <CPU Frequency Thermal Control> on cpu3
est4: <Enhanced SpeedStep Frequency Control> on cpu4
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 14
device_attach: est4 attach returned 6
p4tcc4: <CPU Frequency Thermal Control> on cpu4
est5: <Enhanced SpeedStep Frequency Control> on cpu5
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 14
device_attach: est5 attach returned 6
p4tcc5: <CPU Frequency Thermal Control> on cpu5
est6: <Enhanced SpeedStep Frequency Control> on cpu6
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 14
device_attach: est6 attach returned 6
p4tcc6: <CPU Frequency Thermal Control> on cpu6
est7: <Enhanced SpeedStep Frequency Control> on cpu7
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 14
device_attach: est7 attach returned 6
p4tcc7: <CPU Frequency Thermal Control> on cpu7
Timecounters tick every 1.000 msec
usbus0: 480Mbps High Speed USB v2.0
usbus1: 480Mbps High Speed USB v2.0
ugen0.1: <Intel> at usbus0
uhub0: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus0
ugen1.1: <Intel> at usbus1
uhub1: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus1
ada0 at ahcich0 bus 0 scbus0 target 0 lun 0
ada0: <WDC WD3200AAKS-00F0A0 12.01B02> ATA-8 SATA 2.x device
ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada0: Command Queueing enabled
ada0: 305245MB (625142448 512 byte sectors: 16H 63S/T 16383C)
ada0: Previously was known as ad4
ada1 at ahcich1 bus 0 scbus1 target 0 lun 0
ada1: <WDC WD3200AAKS-00F0A0 12.01B02> ATA-8 SATA 2.x device
ada1: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada1: Command Queueing enabled
ada1: 305245MB (625142448 512 byte sectors: 16H 63S/T 16383C)
ada1: Previously was known as ad6
ada2 at ahcich2 bus 0 scbus2 target 0 lun 0
cd0 at ahcich5 bus 0 scbus5 target 0 lun 0
cd0: <TSSTcorp CDDVDW SN-S083F SB01> Removable CD-ROM SCSI-0 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
ada2: <WDC WD5003ABYX-01WERA1 01.01S02> ATA-8 SATA 2.x device
ada2: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada2: Command Queueing enabled
ada2: 476940MB (976773168 512 byte sectors: 16H 63S/T 16383C)
ada2: Previously was known as ad8
ada3 at ahcich3 bus 0 scbus3 target 0 lun 0
ada3: <WDC WD5003ABYX-01WERA1 01.01S02> ATA-8 SATA 2.x device
ada3: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada3: Command Queueing enabled
ada3: 476940MB (976773168 512 byte sectors: 16H 63S/T 16383C)
ada3: Previously was known as ad10
SMP: AP CPU #1 Launched!
SMP: AP CPU #6 Launched!
SMP: AP CPU #7 Launched!
SMP: AP CPU #3 Launched!
SMP: AP CPU #4 Launched!
SMP: AP CPU #2 Launched!
SMP: AP CPU #5 Launched!
GEOM_STRIPE: Device st0 created (id=1787956235).
GEOM_STRIPE: Disk ada1 attached to st0.
Root mount waiting for: usbus1 usbus0
uhub0: 2 ports with 2 removable, self powered
uhub1: 2 ports with 2 removable, self powered
Root mount waiting for: usbus1 usbus0
ugen0.2: <vendor 0x8087> at usbus0
uhub2: <vendor 0x8087 product 0x0020, class 9/0, rev 2.00/0.00, addr 2> on usbus0
ugen1.2: <vendor 0x8087> at usbus1
uhub3: <vendor 0x8087 product 0x0020, class 9/0, rev 2.00/0.00, addr 2> on usbus1
Root mount waiting for: usbus1 usbus0
uhub2: 6 ports with 6 removable, self powered
uhub3: 8 ports with 8 removable, self powered
Root mount waiting for: usbus1 usbus0
ugen0.3: <Winbond Electronics Corp> at usbus0
ums0: <Winbond Electronics Corp Hermon USB hidmouse Device, class 0/0, rev 1.10/0.01, addr 3> on usbus0
ums0: 3 buttons and [Z] coordinates ID=0
ukbd0: <Winbond Electronics Corp Hermon USB hidmouse Device, class 0/0, rev 1.10/0.01, addr 3> on usbus0
kbd2 at ukbd0
Root mount waiting for: usbus1
ugen1.3: <USB 2.0> at usbus1
umass0: <USB 2.0 Flash Disk, class 0/0, rev 2.00/1.00, addr 3> on usbus1
umass0:  SCSI over Bulk-Only; quirks = 0x4100
umass0:6:0:-1: Attached to scbus6
da0 at umass-sim0 bus 0 scbus6 target 0 lun 0
da0: <USB 2.0 Flash Disk 5.00> Removable Direct Access SCSI-2 device 
da0: 40.000MB/s transfers
da0: 7930MB (16240640 512 byte sectors: 255H 63S/T 1010C)
Trying to mount root from ufs:/dev/da0p2 [rw]...
ZFS filesystem version 5
ZFS storage pool version 28
GEOM_STRIPE: Disk ada1 removed from st0.
GEOM_STRIPE: Device st0 destroyed.

>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-ports-bugs->flz 
Responsible-Changed-By: edwin 
Responsible-Changed-When: Tue Sep 11 20:54:27 UTC 2012 
Responsible-Changed-Why:  
Over to maintainer (via the GNATS Auto Assign Tool) 

http://www.freebsd.org/cgi/query-pr.cgi?pr=171557 

From: Jonathan <jonathan@kc8onw.net>
To: bug-followup@FreeBSD.org, paul.g.webster@googlemail.com
Cc:  
Subject: Re: ports/171557: net-p2p/rtorrent + ZFS 200% WCPU/kqread deadlock
Date: Tue, 11 Sep 2012 20:32:32 -0400

 I am also having this issue. I'm using 9-stable from a few months before
 the 9.0 release and I'm using libtorrent-devel-0.13.1 and
 rtorrent-devel-0.9.1 with the same symptoms. I can provide shell access
 if needed.
 
 --
 Jonathan

From: "Paul Webster" <admin@worldforme.com>
To: bug-followup@freebsd.org, paul.g.webster@googlemail.com
Cc:  
Subject: Re: ports/171557: net-p2p/rtorrent + ZFS 200% WCPU/kqread deadlock
Date: Wed, 12 Sep 2012 02:54:48 +0100

 I forgot to include at time of running rtorrent:
 
 CPU:  0.0% user,  0.0% nice,  0.0% system,  0.0% interrupt,  100% idle
 Mem: 1079M Active, 1934M Inact, 11G Wired, 223M Cache, 52M Buf, 1790M Free
 Swap: 10G Total, 840K Used, 10G Free
 
 and ZFS:
 
 ------------------------------------------------------------------------
 ZFS Subsystem Report                            Wed Sep 12 01:51:31 2012
 ------------------------------------------------------------------------
 
 ARC Summary: (HEALTHY)
          Memory Throttle Count:                  0
 
 ARC Misc:
          Deleted:                                5.01m
          Recycle Misses:                         302.51k
          Mutex Misses:                           3.81k
          Evict Skips:                            789.83k
 
 ARC Size:                               62.64%  9.07    GiB
          Target Size: (Adaptive)         63.90%  9.25    GiB
          Min Size (Hard Limit):          12.50%  1.81    GiB
          Max Size (High Water):          8:1     14.47   GiB
 
 ARC Size Breakdown:
          Recently Used Cache Size:       67.22%  6.22    GiB
          Frequently Used Cache Size:     32.78%  3.03    GiB
 
 ARC Hash Breakdown:
          Elements Max:                           945.57k
          Elements Current:               99.30%  938.99k
          Collisions:                             39.90m
          Chain Max:                              19
          Chains:                                 219.78k
 
 ------------------------------------------------------------------------
 
 Ports is upto date, rtorrent: rtorrent-0.9.2      BitTorrent Client  
 written in C++
 
 
 
 -- 
 Using Opera's revolutionary email client: http://www.opera.com/mail/

From: Ryan Holt <ryan@ryanholt.net>
To: "bug-followup@FreeBSD.org" <bug-followup@FreeBSD.org>,
	"paul.g.webster@googlemail.com" <paul.g.webster@googlemail.com>
Cc:  
Subject: Re: ports/171557: net-p2p/rtorrent + ZFS 200% WCPU/kqread deadlock
Date: Wed, 12 Sep 2012 15:16:03 +0000

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 I'm also having the same issue.
 
 Freshly installed FreeBSD 9 system with latest ports snapshot. Occurred wit=
 h both rtorrent and rtorrent-devel.
 
 Thanks,
 Ryan
 
 
 
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 <p class=3D"MsoNormal">I&#8217;m also having the same issue.<o:p></o:p></p>
 <p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
 <p class=3D"MsoNormal">Freshly installed FreeBSD 9 system with latest ports=
  snapshot. Occurred with both rtorrent and rtorrent-devel.<o:p></o:p></p>
 <p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
 <p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
 <p class=3D"MsoNormal">Ryan<o:p></o:p></p>
 <p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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From: Alexandre Brooks <alexandre.brooks@gmail.com>
To: bug-followup@FreeBSD.org, paul.g.webster@googlemail.com
Cc:  
Subject: Re: ports/171557: net-p2p/rtorrent + ZFS 200% WCPU/kqread deadlock
Date: Mon, 8 Oct 2012 19:23:56 +0100

 Hi,
 
 Following the same issue on FreeBSD and on Gentoo, it seems an update
 from curl broke rtorrent
 (http://forums.gentoo.org/viewtopic.php?p=7158650#7158650)
 
 I solved the issue by going back to curl-7.21.3_2 (committed sometime
 in Feb 2012). I also came back on libtorrent-0.13.2 (first commit) and
 rtorrent-0.9.2 (first commit).
 
 This is painful, but whilst the rtorrent developper fixes the issue,
 ports-mgmt/portdowngrade is going to be your friend I'm afraid.
 
 Enjoy
 -- 
 Alexandre Brooks

From: "Paul Webster" <paul.g.webster@googlemail.com>
To: bug-followup@freebsd.org, paul.g.webster@googlemail.com
Cc:  
Subject: Re: ports/171557: net-p2p/rtorrent + ZFS 200% WCPU/kqread deadlock
Date: Mon, 15 Oct 2012 18:43:41 +0100

 This issue is now resolved, as of the latest ports update:
 
 rtorrent version:
 
 Rakshasa's BitTorrent client version 0.9.2.
 
 
 -- 
 Using Opera's revolutionary email client: http://www.opera.com/mail/
State-Changed-From-To: open->closed 
State-Changed-By: az 
State-Changed-When: Wed Oct 24 08:19:02 UTC 2012 
State-Changed-Why:  
Fixed by r305913 

http://www.freebsd.org/cgi/query-pr.cgi?pr=171557 
>Unformatted:
