Panic during kernel booting on HP Proliant DL180G6 and latest STABLE

Bartosz Stec bartosz.stec at it4pro.pl
Tue Sep 13 15:31:25 UTC 2011


Hi again list. Here's little update about the issue.
> Yes, there have been a few times when I have seen something like this, and issue when the driver is static and not when modulized. I have never been clear what to make of this. If anyone else here has any thoughts or enlightening ideas I'd appreciate it.
Fresh build, 8.2-STABLE #7: Tue Sep 13 14:25:45, problem is still here, 
regardless of igb included in the kernel or loaded as module from 
loader.conf, system panic with msix enabled.
> Also if it does not even happen when using the GENERIC config then it would be interesting to see the diff between that and what does cause the panic.
Here it is:

    --- GENERIC	2011-04-10 19:55:25.304366901 +0200
    +++ PROLIANT	2011-06-18 16:03:32.728117341 +0200
    @@ -19,7 +19,7 @@
      # $FreeBSD: src/sys/amd64/conf/GENERIC,v 1.531.2.17 2011/04/09 12:04:35 bz Exp $

      cpu		HAMMER
    -ident		GENERIC
    +ident		PROLIANT

      # To statically compile in device wiring instead of /boot/device.hints
      #hints		"GENERIC.hints"		# Default places to look for devices.
    @@ -30,7 +30,7 @@
      #
      # env		"GENERIC.env"

    -makeoptions	DEBUG=-g		# Build kernel with gdb(1) debug symbols
    +#makeoptions	DEBUG=-g		# Build kernel with gdb(1) debug symbols

      options 	SCHED_ULE		# ULE scheduler
      options 	PREEMPTION		# Enable kernel thread preemption
    @@ -44,9 +44,9 @@
      options 	UFS_GJOURNAL		# Enable gjournal-based UFS journaling
      options 	MD_ROOT			# MD is a potential root device
      options 	NFSCLIENT		# Network Filesystem Client
    -options 	NFSSERVER		# Network Filesystem Server
    -options 	NFSLOCKD		# Network Lock Manager
    -options 	NFS_ROOT		# NFS usable as /, requires NFSCLIENT
    +#options 	NFSSERVER		# Network Filesystem Server
    +#options 	NFSLOCKD		# Network Lock Manager
    +#options 	NFS_ROOT		# NFS usable as /, requires NFSCLIENT
      options 	MSDOSFS			# MSDOS Filesystem
      options 	CD9660			# ISO 9660 Filesystem
      options 	PROCFS			# Process filesystem (requires PSEUDOFS)
    @@ -81,10 +81,18 @@

      # Make an SMP-capable kernel by default
      options 	SMP			# Symmetric MultiProcessor Kernel
    +options         DEVICE_POLLING

      # CPU frequency control
      device		cpufreq

    +options         ALTQ
    +options         ALTQ_CBQ                # Class Bases Queuing (CBQ)
    +options         ALTQ_RED                # Random Early Detection (RED)
    +options         ALTQ_RIO                # RED In/Out
    +options         ALTQ_HFSC               # Hierarchical Packet Scheduler (HFSC)
    +options         ALTQ_PRIQ               # Priority Queuing (PRIQ)
    +
      # Bus support.
      device		acpi
      device		pci
    @@ -102,59 +110,59 @@
      options 	ATA_STATIC_ID	# Static device numbering

      # SCSI Controllers
    -device		ahc		# AHA2940 and onboard AIC7xxx devices
    -options 	AHC_REG_PRETTY_PRINT	# Print register bitfields in debug
    +#device		ahc		# AHA2940 and onboard AIC7xxx devices
    +#options 	AHC_REG_PRETTY_PRINT	# Print register bitfields in debug
      					# output.  Adds ~128k to driver.
    -device		ahd		# AHA39320/29320 and onboard AIC79xx devices
    -options 	AHD_REG_PRETTY_PRINT	# Print register bitfields in debug
    +#device		ahd		# AHA39320/29320 and onboard AIC79xx devices
    +#options 	AHD_REG_PRETTY_PRINT	# Print register bitfields in debug
      					# output.  Adds ~215k to driver.
    -device		amd		# AMD 53C974 (Tekram DC-390(T))
    -device		hptiop		# Highpoint RocketRaid 3xxx series
    -device		isp		# Qlogic family
    +#device		amd		# AMD 53C974 (Tekram DC-390(T))
    +#device		hptiop		# Highpoint RocketRaid 3xxx series
    +#device		isp		# Qlogic family
      #device		ispfw		# Firmware for QLogic HBAs- normally a module
    -device		mpt		# LSI-Logic MPT-Fusion
    -device		mps		# LSI-Logic MPT-Fusion 2
    +#device		mpt		# LSI-Logic MPT-Fusion
    +#device		mps		# LSI-Logic MPT-Fusion 2
      #device		ncr		# NCR/Symbios Logic
    -device		sym		# NCR/Symbios Logic (newer chipsets + those of `ncr')
    -device		trm		# Tekram DC395U/UW/F DC315U adapters
    +#device		sym		# NCR/Symbios Logic (newer chipsets + those of `ncr')
    +#device		trm		# Tekram DC395U/UW/F DC315U adapters

    -device		adv		# Advansys SCSI adapters
    -device		adw		# Advansys wide SCSI adapters
    -device		aic		# Adaptec 15[012]x SCSI adapters, AIC-6[23]60.
    -device		bt		# Buslogic/Mylex MultiMaster SCSI adapters
    +#device		adv		# Advansys SCSI adapters
    +#device		adw		# Advansys wide SCSI adapters
    +#device		aic		# Adaptec 15[012]x SCSI adapters, AIC-6[23]60.
    +#device		bt		# Buslogic/Mylex MultiMaster SCSI adapters

      # SCSI peripherals
      device		scbus		# SCSI bus (required for SCSI)
    -device		ch		# SCSI media changers
    +#device		ch		# SCSI media changers
      device		da		# Direct Access (disks)
    -device		sa		# Sequential Access (tape etc)
    +#device		sa		# Squential Access (tape etc)
      device		cd		# CD
      device		pass		# Passthrough device (direct SCSI access)
    -device		ses		# SCSI Environmental Services (and SAF-TE)
    +#device		ses		# SCSI Environmental Services (and SAF-TE)

      # RAID controllers interfaced to the SCSI subsystem
    -device		amr		# AMI MegaRAID
    -device		arcmsr		# Areca SATA II RAID
    +#device		amr		# AMI MegaRAID
    +#device		arcmsr		# Areca SATA II RAID
      #XXX it is not 64-bit clean, -scottl
      #device		asr		# DPT SmartRAID V, VI and Adaptec SCSI RAID
    -device		ciss		# Compaq Smart RAID 5*
    -device		dpt		# DPT Smartcache III, IV - See NOTES for options
    -device		hptmv		# Highpoint RocketRAID 182x
    -device		hptrr		# Highpoint RocketRAID 17xx, 22xx, 23xx, 25xx
    -device		iir		# Intel Integrated RAID
    -device		ips		# IBM (Adaptec) ServeRAID
    -device		mly		# Mylex AcceleRAID/eXtremeRAID
    -device		twa		# 3ware 9000 series PATA/SATA RAID
    +#device		ciss		# Compaq Smart RAID 5*
    +#device		dpt		# DPT Smartcache III, IV - See NOTES for options
    +#device		hptmv		# Highpoint RocketRAID 182x
    +#device		hptrr		# Highpoint RocketRAID 17xx, 22xx, 23xx, 25xx
    +#device		iir		# Intel Integrated RAID
    +#device		ips		# IBM (Adaptec) ServeRAID
    +#device		mly		# Mylex AcceleRAID/eXtremeRAID
    +#device		twa		# 3ware 9000 series PATA/SATA RAID

      # RAID controllers
    -device		aac		# Adaptec FSA RAID
    -device		aacp		# SCSI passthrough for aac (requires CAM)
    -device		ida		# Compaq Smart RAID
    -device		mfi		# LSI MegaRAID SAS
    -device		mlx		# Mylex DAC960 family
    +#device		aac		# Adaptec FSA RAID
    +#device		aacp		# SCSI passthrough for aac (requires CAM)
    +#device		ida		# Compaq Smart RAID
    +#device		mfi		# LSI MegaRAID SAS
    +#device		mlx		# Mylex DAC960 family
      #XXX pointer/int warnings
      #device		pst		# Promise Supertrak SX6000
    -device		twe		# 3ware ATA RAID
    +#device		twe		# 3ware ATA RAID

      # atkbdc0 controls both the keyboard and the PS/2 mouse
      device		atkbdc		# AT keyboard controller
    @@ -170,13 +178,13 @@
      # syscons is the default console driver, resembling an SCO console
      device		sc

    -device		agp		# support several AGP chipsets
    +#device		agp		# support several AGP chipsets

      # PCCARD (PCMCIA) support
      # PCMCIA and cardbus bridge support
    -device		cbb		# cardbus (yenta) bridge
    -device		pccard		# PC Card (16-bit) bus
    -device		cardbus		# CardBus (32-bit) bus
    +#device		cbb		# cardbus (yenta) bridge
    +#device		pccard		# PC Card (16-bit) bus
    +#device		cardbus		# CardBus (32-bit) bus

      # Serial (COM) ports
      device		uart		# Generic UART driver
    @@ -195,76 +203,76 @@
      #device		puc

      # PCI Ethernet NICs.
    -device		de		# DEC/Intel DC21x4x (``Tulip'')
    -device		em		# Intel PRO/1000 Gigabit Ethernet Family
    -device		igb		# Intel PRO/1000 PCIE Server Gigabit Family
    -device		ixgbe		# Intel PRO/10GbE PCIE Ethernet Family
    -device		le		# AMD Am7900 LANCE and Am79C9xx PCnet
    -device		ti		# Alteon Networks Tigon I/II gigabit Ethernet
    -device		txp		# 3Com 3cR990 (``Typhoon'')
    -device		vx		# 3Com 3c590, 3c595 (``Vortex'')
    +#device		de		# DEC/Intel DC21x4x (``Tulip'')
    +#device		em		# Intel PRO/1000 Gigabit Ethernet Family
    +#device		igb		# Intel PRO/1000 PCIE Server Gigabit Family
    +#device		ixgbe		# Intel PRO/10GbE PCIE Ethernet Family
    +#device		le		# AMD Am7900 LANCE and Am79C9xx PCnet
    +#device		ti		# Alteon Networks Tigon I/II gigabit Ethernet
    +#device		txp		# 3Com 3cR990 (``Typhoon'')
    +#device		vx		# 3Com 3c590, 3c595 (``Vortex'')

      # PCI Ethernet NICs that use the common MII bus controller code.
      # NOTE: Be sure to keep the 'device miibus' line in order to use these NICs!
      device		miibus		# MII bus support
    -device		ae		# Attansic/Atheros L2 FastEthernet
    -device		age		# Attansic/Atheros L1 Gigabit Ethernet
    -device		alc		# Atheros AR8131/AR8132 Ethernet
    -device		ale		# Atheros AR8121/AR8113/AR8114 Ethernet
    -device		bce		# Broadcom BCM5706/BCM5708 Gigabit Ethernet
    -device		bfe		# Broadcom BCM440x 10/100 Ethernet
    -device		bge		# Broadcom BCM570xx Gigabit Ethernet
    -device		dc		# DEC/Intel 21143 and various workalikes
    -device		et		# Agere ET1310 10/100/Gigabit Ethernet
    -device		fxp		# Intel EtherExpress PRO/100B (82557, 82558)
    -device		jme		# JMicron JMC250 Gigabit/JMC260 Fast Ethernet
    -device		lge		# Level 1 LXT1001 gigabit Ethernet
    -device		msk		# Marvell/SysKonnect Yukon II Gigabit Ethernet
    -device		nfe		# nVidia nForce MCP on-board Ethernet
    -device		nge		# NatSemi DP83820 gigabit Ethernet
    +#device		ae		# Attansic/Atheros L2 FastEthernet
    +#device		age		# Attansic/Atheros L1 Gigabit Ethernet
    +#device		alc		# Atheros AR8131/AR8132 Ethernet
    +#device		ale		# Atheros AR8121/AR8113/AR8114 Ethernet
    +#device		bce		# Broadcom BCM5706/BCM5708 Gigabit Ethernet
    +#device		bfe		# Broadcom BCM440x 10/100 Ethernet
    +#device		bge		# Broadcom BCM570xx Gigabit Ethernet
    +#device		dc		# DEC/Intel 21143 and various workalikes
    +#device		et		# Agere ET1310 10/100/Gigabit Ethernet
    +#device		fxp		# Intel EtherExpress PRO/100B (82557, 82558)
    +#device		jme		# JMicron JMC250 Gigabit/JMC260 Fast Ethernet
    +#device		lge		# Level 1 LXT1001 gigabit Ethernet
    +#device		msk		# Marvell/SysKonnect Yukon II Gigabit Ethernet
    +#device		nfe		# nVidia nForce MCP on-board Ethernet
    +#device		nge		# NatSemi DP83820 gigabit Ethernet
      #device		nve		# nVidia nForce MCP on-board Ethernet Networking
    -device		pcn		# AMD Am79C97x PCI 10/100 (precedence over 'le')
    -device		re		# RealTek 8139C+/8169/8169S/8110S
    -device		rl		# RealTek 8129/8139
    -device		sf		# Adaptec AIC-6915 (``Starfire'')
    -device		sge		# Silicon Integrated Systems SiS190/191
    -device		sis		# Silicon Integrated Systems SiS 900/SiS 7016
    -device		sk		# SysKonnect SK-984x&  SK-982x gigabit Ethernet
    -device		ste		# Sundance ST201 (D-Link DFE-550TX)
    -device		stge		# Sundance/Tamarack TC9021 gigabit Ethernet
    -device		tl		# Texas Instruments ThunderLAN
    -device		tx		# SMC EtherPower II (83c170 ``EPIC'')
    -device		vge		# VIA VT612x gigabit Ethernet
    -device		vr		# VIA Rhine, Rhine II
    -device		wb		# Winbond W89C840F
    -device		xl		# 3Com 3c90x (``Boomerang'', ``Cyclone'')
    +#device		pcn		# AMD Am79C97x PCI 10/100 (precedence over 'le')
    +#device		re		# RealTek 8139C+/8169/8169S/8110S
    +#device		rl		# RealTek 8129/8139
    +#device		sf		# Adaptec AIC-6915 (``Starfire'')
    +#device		sge		# Silicon Integrated Systems SiS190/191
    +#device		sis		# Silicon Integrated Systems SiS 900/SiS 7016
    +#device		sk		# SysKonnect SK-984x&  SK-982x gigabit Ethernet
    +#device		ste		# Sundance ST201 (D-Link DFE-550TX)
    +#device		stge		# Sundance/Tamarack TC9021 gigabit Ethernet
    +#device		tl		# Texas Instruments ThunderLAN
    +#device		tx		# SMC EtherPower II (83c170 ``EPIC'')
    +#device		vge		# VIA VT612x gigabit Ethernet
    +#device		vr		# VIA Rhine, Rhine II
    +#device		wb		# Winbond W89C840F
    +#device		xl		# 3Com 3c90x (``Boomerang'', ``Cyclone'')

      # ISA Ethernet NICs.  pccard NICs included.
    -device		cs		# Crystal Semiconductor CS89x0 NIC
    +#device		cs		# Crystal Semiconductor CS89x0 NIC
      # 'device ed' requires 'device miibus'
    -device		ed		# NE[12]000, SMC Ultra, 3c503, DS8390 cards
    -device		ex		# Intel EtherExpress Pro/10 and Pro/10+
    -device		ep		# Etherlink III based cards
    -device		fe		# Fujitsu MB8696x based cards
    -device		sn		# SMC's 9000 series of Ethernet chips
    -device		xe		# Xircom pccard Ethernet
    +#device		ed		# NE[12]000, SMC Ultra, 3c503, DS8390 cards
    +#device		ex		# Intel EtherExpress Pro/10 and Pro/10+
    +#device		ep		# Etherlink III based cards
    +#device		fe		# Fujitsu MB8696x based cards
    +#device		sn		# SMC's 9000 series of Ethernet chips
    +#device		xe		# Xircom pccard Ethernet

      # Wireless NIC cards
    -device		wlan		# 802.11 support
    -options 	IEEE80211_DEBUG	# enable debug msgs
    -options 	IEEE80211_AMPDU_AGE # age frames in AMPDU reorder q's
    -options 	IEEE80211_SUPPORT_MESH	# enable 802.11s draft support
    -device		wlan_wep	# 802.11 WEP support
    -device		wlan_ccmp	# 802.11 CCMP support
    -device		wlan_tkip	# 802.11 TKIP support
    -device		wlan_amrr	# AMRR transmit rate control algorithm
    -device		an		# Aironet 4500/4800 802.11 wireless NICs.
    -device		ath		# Atheros pci/cardbus NIC's
    -device		ath_hal		# pci/cardbus chip support
    -options 	AH_SUPPORT_AR5416	# enable AR5416 tx/rx descriptors
    -device		ath_rate_sample	# SampleRate tx rate control for ath
    -device		ral		# Ralink Technology RT2500 wireless NICs.
    -device		wi		# WaveLAN/Intersil/Symbol 802.11 wireless NICs.
    +#device		wlan		# 802.11 support
    +#options 	IEEE80211_DEBUG	# enable debug msgs
    +#options 	IEEE80211_AMPDU_AGE # age frames in AMPDU reorder q's
    +#options 	IEEE80211_SUPPORT_MESH	# enable 802.11s draft support
    +#device		wlan_wep	# 802.11 WEP support
    +#device		wlan_ccmp	# 802.11 CCMP support
    +#device		wlan_tkip	# 802.11 TKIP support
    +#device		wlan_amrr	# AMRR transmit rate control algorithm
    +#device		an		# Aironet 4500/4800 802.11 wireless NICs.
    +#device		ath		# Atheros pci/cardbus NIC's
    +#device		ath_hal		# pci/cardbus chip support
    +#options 	AH_SUPPORT_AR5416	# enable AR5416 tx/rx descriptors
    +#device		ath_rate_sample	# SampleRate tx rate control for ath
    +#device		ral		# Ralink Technology RT2500 wireless NICs.
    +#device		wi		# WaveLAN/Intersil/Symbol 802.11 wireless NICs.

      # Pseudo devices.
      device		loop		# Network loopback
    @@ -295,34 +303,36 @@
      device		ulpt		# Printer
      device		umass		# Disks/Mass storage - Requires scbus and da
      device		ums		# Mouse
    -device		urio		# Diamond Rio 500 MP3 player
    +#device		urio		# Diamond Rio 500 MP3 player
      # USB Serial devices
    -device		uark		# Technologies ARK3116 based serial adapters
    -device		ubsa		# Belkin F5U103 and compatible serial adapters
    -device		uftdi		# For FTDI usb serial adapters
    -device		uipaq		# Some WinCE based devices
    -device		uplcom		# Prolific PL-2303 serial adapters
    -device		uslcom		# SI Labs CP2101/CP2102 serial adapters
    -device		uvisor		# Visor and Palm devices
    -device		uvscom		# USB serial support for DDI pocket's PHS
    +#device		uark		# Technologies ARK3116 based serial adapters
    +#device		ubsa		# Belkin F5U103 and compatible serial adapters
    +#device		uftdi		# For FTDI usb serial adapters
    +#device		uipaq		# Some WinCE based devices
    +#device		uplcom		# Prolific PL-2303 serial adapters
    +#device		uslcom		# SI Labs CP2101/CP2102 serial adapters
    +#device		uvisor		# Visor and Palm devices
    +#device		uvscom		# USB serial support for DDI pocket's PHS
      # USB Ethernet, requires miibus
    -device		aue		# ADMtek USB Ethernet
    -device		axe		# ASIX Electronics USB Ethernet
    -device		cdce		# Generic USB over Ethernet
    -device		cue		# CATC USB Ethernet
    -device		kue		# Kawasaki LSI USB Ethernet
    -device		rue		# RealTek RTL8150 USB Ethernet
    -device		udav		# Davicom DM9601E USB
    +#device		aue		# ADMtek USB Ethernet
    +#device		axe		# ASIX Electronics USB Ethernet
    +#device		cdce		# Generic USB over Ethernet
    +#device		cue		# CATC USB Ethernet
    +#device		kue		# Kawasaki LSI USB Ethernet
    +#device		rue		# RealTek RTL8150 USB Ethernet
    +#device		udav		# Davicom DM9601E USB
      # USB Wireless
    -device		rum		# Ralink Technology RT2501USB wireless NICs
    -device		uath		# Atheros AR5523 wireless NICs
    -device		ural		# Ralink Technology RT2500USB wireless NICs
    -device		zyd		# ZyDAS zb1211/zb1211b wireless NICs
    +#device		rum		# Ralink Technology RT2501USB wireless NICs
    +#device		uath		# Atheros AR5523 wireless NICs
    +#device		ural		# Ralink Technology RT2500USB wireless NICs
    +#device		zyd		# ZyDAS zb1211/zb1211b wireless NICs

      # FireWire support
    -device		firewire	# FireWire bus code
    +#device		firewire	# FireWire bus code
      #device		sbp		# SCSI over FireWire (Requires scbus and da)
    -device		fwe		# Ethernet over FireWire (non-standard!)
    -device		fwip		# IP over FireWire (RFC 2734,3146)
    -device		dcons		# Dumb console driver
    -device		dcons_crom	# Configuration ROM for dcons
    +#device		fwe		# Ethernet over FireWire (non-standard!)
    +#device		fwip		# IP over FireWire (RFC 2734,3146)
    +#device		dcons		# Dumb console driver
    +#device		dcons_crom	# Configuration ROM for dcons
    +
    +device          atapicam


>
> -----Original Message-----
> From: Bartosz Stec [mailto:bartosz.stec at it4pro.pl]
> Sent: Friday, June 17, 2011 6:42 AM
> To: Vogel, Jack
> Cc: Jeremy Chadwick; FreeBSD Stable
> Subject: Re: Panic during kernel booting on HP Proliant DL180G6 and latest STABLE
>
> W dniu 2011-06-10 20:23, Vogel, Jack pisze:
>> Er, so what if you get rid of ZFS,  does your panic go away? It doesn't really matter what type adapter it is, the igb driver only requests standard size clusters, so memory is getting trashed somewhere I suspect.
>>
>> Jack
> Well, from my observations about this issue (which could be very wrong
> because my lack of knowledge about BSD kernel) I don't suspect igb
> driver directly, but rather an order which kernel is processing stuff
> related to MSIX and hardware (so I suppose that  real cause of the
> problem could be very hard to catch and repeat)? Here's why:
>
> 1. There's no panic when using GENERIC kernel. There's also nothing
> unusual in my custom kernel (included in thread), neither in make.conf.
>
> 2. Before current build, panic was seen with igb driver included in
> kernel, but no panic when using a module. Even better - no panic when
> trying to load a module while igb driver is stil included in source. No
> random memory corruption here - same scenario seen every boot with all
> variants above. It's HP server with HP ECC memory by the way.
>
> 3. With current build kernel panics regardless if igb driver is a module
> or included in kernel (unless i disable MSIX). But I found override - I
> removed igb driver from kernel config, and a module from loader.conf.
> Than booted in single user mode, and manually loaded igb driver. No
> panic! Appareantly something gets wrong _only_ at boot time.
>

It seems that I was right about the relation of this issue with booting 
process. I enabled MSIX and, removed igb driver in loader.conf, and 
added if_igb to rc.conf uder ' kld_list="" '.
No panic if igb driver is loaded after kernel booting is complete:

    igb0: <Intel(R) PRO/1000 Network Connection version - 2.2.3> port
    0xe880-0xe89f mem
    0xfbe60000-0xfbe7ffff,0xfbe40000-0xfbe5ffff,0xfbeb8000-0xfbebbfff
    irq 28 at device 0.0 on pci7
    igb0: Using MSIX interrupts with 5 vectors
    igb0: [ITHREAD]
    igb0: [ITHREAD]
    igb0: [ITHREAD]
    igb0: [ITHREAD]
    igb0: [ITHREAD]
    igb0: Ethernet address: d8:d3:85:e3:e4:f6
    igb1: <Intel(R) PRO/1000 Network Connection version - 2.2.3> port
    0xec00-0xec1f mem
    0xfbee0000-0xfbefffff,0xfbec0000-0xfbedffff,0xfbebc000-0xfbebffff
    irq 40 at device 0.1 on pci7
    igb1: Using MSIX interrupts with 5 vectors
    igb1: [ITHREAD]
    igb1: [ITHREAD]
    igb1: [ITHREAD]
    igb1: [ITHREAD]
    igb1: [ITHREAD]
    igb1: Ethernet address: d8:d3:85:e3:e4:f7
    igb0: link state changed to UP
    igb1: link state changed to UP

kld_list feature looks like great problem override, because now I I have 
msix enabled and can reboot my server safelly, but it still far from 
actual fix.
Any new ideas?

-- 
Bartosz Stec



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