Date: Thu, 3 Jan 2002 22:33:35 -0600 From: Scott Lamb <slamb@slamb.org> To: freebsd-net@freebsd.org Subject: netgraph kernel panic Message-ID: <20020104043335.GA87710@cairo.zsat.net>
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Hi,
FreeBSD 4.5-PRERELEASE (as of a few days ago) is crashing consistently
when I try to initiate a PPTP connection to with mpd-netgraph 3.3 (from
ports).
mpd ups the interface happily:
mpd: [vpn] IPCP: rec'd Configure Ack #3 link 0 (Ack-
Sent)
mpd: IPADDR a.b.c.d
mpd: [vpn] IPCP: state change Ack-Sent --> Opened
mpd: [vpn] IPCP: LayerUp
mpd: a.b.c.d -> a.b.c.e
mpd: [vpn] IFACE: Up event
mpd: [vpn] exec: /sbin/ifconfig ng0 a.b.c.d a.b.c.e netmask 0xffffffff -link0
mpd: [vpn] exec: /sbin/route add a.b.0.0 a.b.c.e -netmask 0xffff0000
mpd: [vpn] IFACE: Up event
...then crashes immediately afterward with "fatal trap 12: page fault
while in kernel mode". I saved the kernel core file. The panic looks
like this:
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x70
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc01ca6b8
stack pointer = 0x10:0xc03f1d58
frame pointer = 0x10:0xc03f1d7c
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = Idle
interrupt mask = net tty bio cam
trap number = 12
panic: page fault
syncing disks...
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x30
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc0303f72
stack pointer = 0x10:0xc03f1b2c
frame pointer = 0x10:0xc03f1b40
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = Idle
interrupt mask = net tty bio cam
trap number = 12
panic: page fault
Uptime: 24s
The stack trace looks like this:
#0 0xc01c78c2 in dumpsys ()
#1 0xc01c76e3 in boot ()
#2 0xc01c7ab8 in poweroff_wait ()
#3 0xc036c4c6 in trap_fatal ()
#4 0xc036c199 in trap_pfault ()
#5 0xc036bd83 in trap ()
#6 0xc0303f72 in mfs_strategy ()
#7 0xc01ecc6a in bwrite ()
#8 0xc01f2286 in vop_stdbwrite ()
#9 0xc01f20e1 in vop_defaultop ()
#10 0xc01ecfba in bawrite ()
#11 0xc01ffcd0 in spec_fsync ()
#12 0xc0303e2a in mfs_fsync ()
#13 0xc03022ff in ffs_sync ()
#14 0xc01f703b in sync ()
#15 0xc01c7496 in boot ()
#16 0xc01c7ab8 in poweroff_wait ()
#17 0xc036c4c6 in trap_fatal ()
#18 0xc036c199 in trap_pfault ()
#19 0xc036bd83 in trap ()
#20 0xc01ca6b8 in tsleep ()
#21 0xc01e7c75 in sb_lock ()
#22 0xc01e5698 in sosend ()
#23 0xc0225201 in ng_ksocket_rcvdata ()
#24 0xc021ef71 in ng_send_data ()
#25 0xc022c4e3 in ng_pptpgre_xmit ()
#26 0xc022c04c in ng_pptpgre_rcvdata ()
#27 0xc021ef71 in ng_send_data ()
#28 0xc0228638 in ng_ppp_output ()
#29 0xc0228186 in ng_ppp_rcvdata ()
#30 0xc021ef71 in ng_send_data ()
#31 0xc0221f26 in ng_bpf_rcvdata ()
#32 0xc021ef71 in ng_send_data ()
#33 0xc0224085 in ng_iface_output ()
#34 0xc02376df in ip_output ()
#35 0xc02390d6 in rip_output ()
#36 0xc023952b in rip_send ()
#37 0xc01e5bb3 in sosend ()
#38 0xc0225201 in ng_ksocket_rcvdata ()
#39 0xc021ef71 in ng_send_data ()
#40 0xc022c4e3 in ng_pptpgre_xmit ()
#41 0xc022cb24 in ng_pptpgre_send_ack_timeout ()
#42 0xc01cd515 in softclock ()
The kernel I'm running has all the NETGRAPH options from LINT compiled
in (minus NETGRAPH_MPPC_COMPRESSION, which was commented out).
I'd appreciate any help. (And have other data...my mpd configuration,
etc. I don't have a full symbol table, though...my system didn't quite
match up with what the Developer's Handbook said to expect. /sys/compile
and /usr/sys/compile have only an empty ".keepit" after doing the "make
buildkernel" / "make installkernel" thing. I did compile with the
DEBUG=-g line uncommented in my kernel config file.
Thanks a lot,
Scott Lamb
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