>Number: 171711
>Category: kern
>Synopsis: [dummynet] [panic] Kernel panic in dummynet
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Sep 17 14:50:11 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: Eugene Grosbein
>Release: FreeBSD 8.3-STABLE amd64
>Organization:
RDTC JSC
>Environment:
System: FreeBSD k-45-pc-1.sd.rdtc.ru 8.3-STABLE FreeBSD 8.3-STABLE #37: Wed Jun
13 12:25:17 NOVT 2012
[email protected]:/usr/local/obj/home/src/sys/PPPOE amd64
>Description:
I run pretty busy mpd-5.6 based PPPoE access server
(about 1700 simultaneous connections at most loaded hours).
It uses dummynet extensively: each connecting user obtains its own
dynamic dummynet pipes.
Some time ago this server has crashed. Crashdump points to some
dummynet-related code:
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This GDB was configured as "amd64-marcel-freebsd"...
Unread portion of the kernel message buffer:
0 (dummynet)
trap number = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper() at 0xffffffff801adf1a = db_trace_self_wrapper+0x2a
kdb_backtrace() at 0xffffffff80330827 = kdb_backtrace+0x37
panic() at 0xffffffff802fd48e = panic+0x1ce
trap_fatal() at 0xffffffff804f3f80 = trap_fatal+0x290
trap_pfault() at 0xffffffff804f430e = trap_pfault+0x23e
trap() at 0xffffffff804f47de = trap+0x3ce
calltrap() at 0xffffffff804dac04 = calltrap+0x8
--- trap 0xc, rip = 0x1, rsp = 0xffffff8122a9ea20, rbp = 0xffffff8122a9ea40 ---
uart_z8530_class() at 0x1
uma_zfree_arg() at 0xffffffff804b53da = uma_zfree_arg+0x3a
m_freem() at 0xffffffff8035c4a7 = m_freem+0x37
dummynet_send() at 0xffffffff8040017d = dummynet_send+0x2d
dummynet_task() at 0xffffffff80400496 = dummynet_task+0x1c6
taskqueue_run_locked() at 0xffffffff8033cdf5 = taskqueue_run_locked+0x85
taskqueue_thread_loop() at 0xffffffff8033cf8e = taskqueue_thread_loop+0x4e
fork_exit() at 0xffffffff802d13cf = fork_exit+0x11f
fork_trampoline() at 0xffffffff804db14e = fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffff8122a9ecf0, rbp = 0 ---
Uptime: 14d8h5m59s
Dumping 754 out of 4079 MB:..3%..11%..22%..32%..41%..51%..62%..73%..81%..92%
Reading symbols from /boot/kernel/ipmi.ko...done.
Loaded symbols for /boot/kernel/ipmi.ko
#0 doadump () at /home/src/sys/kern/kern_shutdown.c:268
268 if (textdump_pending)
(kgdb) bt
#0 doadump () at /home/src/sys/kern/kern_shutdown.c:268
#1 0xffffffff802fcf8a in boot (howto=260) at
/home/src/sys/kern/kern_shutdown.c:448
#2 0xffffffff802fd467 in panic (fmt=0x1 <Address 0x1 out of bounds>) at
/home/src/sys/kern/kern_shutdown.c:639
#3 0xffffffff804f3f80 in trap_fatal (frame=0xc, eva=Variable "eva" is not
available.
) at /home/src/sys/amd64/amd64/trap.c:848
#4 0xffffffff804f430e in trap_pfault (frame=0xffffff8122a9e970, usermode=0) at
/home/src/sys/amd64/amd64/trap.c:764
#5 0xffffffff804f47de in trap (frame=0xffffff8122a9e970) at
/home/src/sys/amd64/amd64/trap.c:457
#6 0xffffffff804dac04 in calltrap () at
/home/src/sys/amd64/amd64/exception.S:228
#7 0x0000000000000001 in ?? ()
#8 0xffffffff802eb967 in mb_dtor_pack (mem=Variable "mem" is not available.
) at /home/src/sys/kern/kern_mbuf.c:453
#9 0xffffffff804b53da in uma_zfree_arg (zone=0xffffff00df773780,
item=0xffffff0054691b00, udata=0x0)
at /home/src/sys/vm/uma_core.c:2543
#10 0xffffffff8035c4a7 in m_freem (mb=0x0) at mbuf.h:562
#11 0xffffffff8040017d in dummynet_send (m=0xffffff0054691b00) at
/home/src/sys/netinet/ipfw/ip_dn_io.c:705
#12 0xffffffff80400496 in dummynet_task (context=Variable "context" is not
available.
) at /home/src/sys/netinet/ipfw/ip_dn_io.c:615
#13 0xffffffff8033cdf5 in taskqueue_run_locked (queue=0xffffff0003a09380) at
/home/src/sys/kern/subr_taskqueue.c:250
#14 0xffffffff8033cf8e in taskqueue_thread_loop (arg=Variable "arg" is not
available.
) at /home/src/sys/kern/subr_taskqueue.c:387
#15 0xffffffff802d13cf in fork_exit (callout=0xffffffff8033cf40
<taskqueue_thread_loop>, arg=0xffffffff80769e80,
frame=0xffffff8122a9ec40) at /home/src/sys/kern/kern_fork.c:876
#16 0xffffffff804db14e in fork_trampoline () at
/home/src/sys/amd64/amd64/exception.S:602
#17 0x0000000000000000 in ?? ()
#18 0x0000000000000000 in ?? ()
#19 0x0000000000000000 in ?? ()
#20 0x0000000000000000 in ?? ()
#21 0x0000000000000000 in ?? ()
#22 0x0000000000000000 in ?? ()
#23 0x0000000000000000 in ?? ()
#24 0x0000000000000000 in ?? ()
#25 0x0000000000000000 in ?? ()
#26 0x0000000000000000 in ?? ()
#27 0x0000000000000000 in ?? ()
#28 0x0000000000000000 in ?? ()
#29 0x0000000000000000 in ?? ()
#30 0x0000000000000000 in ?? ()
#31 0x0000000000000000 in ?? ()
#32 0x0000000000000000 in ?? ()
#33 0x0000000000000000 in ?? ()
#34 0x0000000000000000 in ?? ()
#35 0x0000000000000000 in ?? ()
#36 0x0000000000000000 in ?? ()
#37 0x0000000000000000 in ?? ()
#38 0x0000000000000000 in ?? ()
#39 0x0000000000000000 in ?? ()
#40 0x0000000000000000 in ?? ()
#41 0xffffffff80763f00 in sleepq_chains ()
#42 0xffffff0003a12d18 in ?? ()
#43 0x0000000000000000 in ?? ()
#44 0xffffff0003a128e0 in ?? ()
---Type <return> to continue, or q <return> to quit---
#45 0xffffff8122a9eaf0 in ?? ()
#46 0xffffff8122a9ea98 in ?? ()
#47 0xffffff0001c0e470 in ?? ()
#48 0xffffffff80323972 in sched_switch (td=0xffffffff8033cf40,
newtd=0xffffffff80769e80, flags=Variable "flags" is not available.
)
at /home/src/sys/kern/sched_ule.c:1886
Previous frame inner to this frame (corrupt stack?)
Here comes its kernel configuration file:
cpu HAMMER
ident PPPOE
# To statically compile in device wiring instead of /boot/device.hints
#hints "GENERIC.hints" # Default places to look for devices.
# Use the following to compile in values accessible to the kernel
# through getenv() (or kenv(1) in userland). The format of the file
# is 'variable=value', see kenv(1)
#
# env "GENERIC.env"
makeoptions DEBUG=-g # Build kernel with gdb(1) debug symbols
options SCHED_ULE # ULE scheduler
options PREEMPTION # Enable kernel thread preemption
options INET # InterNETworking
options INET6 # IPv6 communications protocols
#options SCTP # Stream Control Transmission Protocol
options FFS # Berkeley Fast Filesystem
options SOFTUPDATES # Enable FFS soft updates support
options UFS_ACL # Support for access control lists
options UFS_DIRHASH # Improve performance on big directories
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 MSDOSFS # MSDOS Filesystem
#options CD9660 # ISO 9660 Filesystem
#options PROCFS # Process filesystem (requires PSEUDOFS)
options PSEUDOFS # Pseudo-filesystem framework
options GEOM_PART_GPT # GUID Partition Tables.
options GEOM_LABEL # Provides labelization
#options GEOM_JOURNAL
options COMPAT_43TTY # BSD 4.3 TTY compat (sgtty)
options COMPAT_FREEBSD32 # Compatible with i386 binaries
#options COMPAT_FREEBSD4 # Compatible with FreeBSD4
#options COMPAT_FREEBSD5 # Compatible with FreeBSD5
#options COMPAT_FREEBSD6 # Compatible with FreeBSD6
#options COMPAT_FREEBSD7 # Compatible with FreeBSD7
#options SCSI_DELAY=5000 # Delay (in ms) before probing SCSI
options KTRACE # ktrace(1) support
options STACK # stack(9) support
options SYSVSHM # SYSV-style shared memory
options SYSVMSG # SYSV-style message queues
options SYSVSEM # SYSV-style semaphores
options P1003_1B_SEMAPHORES # POSIX-style semaphores
options _KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time
extensions
options PRINTF_BUFR_SIZE=512 # Prevent printf output being
interspersed.
options KBD_INSTALL_CDEV # install a CDEV entry in /dev
options HWPMC_HOOKS # Necessary kernel hooks for hwpmc(4)
options AUDIT # Security event auditing
options MAC # TrustedBSD MAC Framework
#options FLOWTABLE # per-cpu routing cache
#options KDTRACE_FRAME # Ensure frames are compiled in
#options KDTRACE_HOOKS # Kernel DTrace hooks
options INCLUDE_CONFIG_FILE # Include this file in kernel
# Make an SMP-capable kernel by default
options SMP # Symmetric MultiProcessor Kernel
# CPU frequency control
device cpufreq
# Bus support.
device acpi
device pci
# Floppy drives
#device fdc
# ATA and ATAPI devices
device ata
device atadisk # ATA disk drives
device atapicd # ATAPI CDROM drives
# SCSI peripherals
device scbus # SCSI bus (required for SCSI)
device da # Direct Access (disks)
device cd # CD
device pass # Passthrough device (direct SCSI access)
# atkbdc0 controls both the keyboard and the PS/2 mouse
device atkbdc # AT keyboard controller
device atkbd # AT keyboard
device psm # PS/2 mouse
device kbdmux # keyboard multiplexer
device vga # VGA video card driver
# syscons is the default console driver, resembling an SCO console
device sc
# Serial (COM) ports
device uart # Generic UART driver
# PCI Ethernet NICs.
device em # Intel PRO/1000 Gigabit Ethernet Family
device igb
# Pseudo devices.
device loop # Network loopback
device random # Entropy device
device ether # Ethernet support
device vlan # 802.1Q VLAN support
device pty # BSD-style compatibility pseudo ttys
device md # Memory "disks"
device gif # IPv6 and IPv4 tunneling
device faith # IPv6-to-IPv4 relaying (translation)
device firmware # firmware assist module
device snp
device bpf # Berkeley packet filter
# USB support
#options USB_DEBUG # enable debug msgs
#options USB_VERBOSE
device uhci # UHCI PCI->USB interface
device ehci # EHCI PCI->USB interface (USB 2.0)
device usb # USB Bus (required)
device ukbd # Keyboard
device umass # Disks/Mass storage - Requires scbus and da
device ums # Mouse
device ucom
# USB support for Prolific PL-2303 serial adapters
device uplcom
# USB support for Silicon Laboratories CP2101/CP2102 based USB serial adapters
device uslcom
#options IPSEC
#device crypto
options NETGRAPH
options NETGRAPH_ETHER
options NETGRAPH_IFACE
options NETGRAPH_MPPC_ENCRYPTION
options NETGRAPH_PPP
options NETGRAPH_PPPOE
options NETGRAPH_SOCKET
options NETGRAPH_TCPMSS
options NETGRAPH_TEE
options NETGRAPH_VJC
options IPFIREWALL
options IPFIREWALL_FORWARD
options DUMMYNET
options VFS_AIO
device smbus
device smb
device ichsmb
device iicbus
device iicbb
device ic
device iic
device iicsmb
device coretemp
device ichwd
device nvram
device lagg
options KDB
options KDB_TRACE
options KDB_UNATTENDED
options DDB
options DDB_NUMSYM
#options NETGRAPH_DEBUG
#options INVARIANT_SUPPORT
#options INVARIANTS
#options DEBUG_MEMGUARD
#options BREAK_TO_DEBUGGER
options ALT_BREAK_TO_DEBUGGER
device bridge
>How-To-Repeat:
Run busy router with lots of dummynet dynamic pipes, lots of traffic
inside pipes and high rate of pipe creation/expiration.
>Fix:
Unknown for me.
>Release-Note:
>Audit-Trail:
>Unformatted:
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