Date: Fri, 24 Feb 2012 10:10:36 +0100 From: Ali Mdidech <ali@moua7.com> To: =?ISO-8859-1?Q?Ermal_Lu=E7i?= <eri@freebsd.org> Cc: freebsd-pf@freebsd.org Subject: Re: Panic in packet filter Message-ID: <CAOxY2Cph2rt-1wnoQRBdsr%2BmLCHyBaMAYW2o8Z08W%2B3Dz-_7iw@mail.gmail.com> In-Reply-To: <CAPBZQG16nbu09Bj8rKYUQbuRvCFikvF28REcM41t2urVzn7c1w@mail.gmail.com> References: <CAOxY2CotiKHHcw%2Bjv2pAi6CbZ7oM3V7ohMrwHY0XhrwTAaRz1w@mail.gmail.com> <CAPBZQG16nbu09Bj8rKYUQbuRvCFikvF28REcM41t2urVzn7c1w@mail.gmail.com>
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Hi Ermal,
2012/2/24 Ermal Lu=E7i <eri@freebsd.org>:
> On Thu, Feb 23, 2012 at 8:44 AM, Ali Mdidech <ali@moua7.com> wrote:
>> Hi List,
>>
>> I've a box that panics multiple times randomly since a year whatever
>> the release is (8 or 9)
>> The crash dump shows that the problem is related to pf.
>> Is this some sort of identified bug?
>> Below some info and my pf.conf file.
>>
>> Thank you very much for your help.
>>
>
> Can you try do disable SMP through sysctl and see if you still get this?
> What are you doing to get the panic?
Well, I'm able now to avoid or reproduce the panic.
Disabling counters in <ssh_brute> table makes the server stable enough
and no panic for 48 hours.
Restoring the counters and adding a host in the table by hand (pfctl
-t ssh_brute -T add someip) provokes the panic within few seconds.
I've disabled smp (adding kern.smp.disabled=3D1 in loader.conf and
rebooting) =3D> kernel still panics.
FreeBSD somehost 9.0-RELEASE FreeBSD 9.0-RELEASE #1: Sat Jan 21
09:31:30 CET 2012 root@somehost:/usr/obj/usr/src/sys/DDX3KRNL
i386
> Also its very helpful to know the `uname -a` command output.
>
>> panic: page fault
>>
>> GNU gdb 6.1.1 [FreeBSD]
>> Copyright 2004 Free Software Foundation, Inc.
>> GDB is free software, covered by the GNU General Public License, and you=
are
>> welcome to change it and/or distribute copies of it under certain condit=
ions.
>> Type "show copying" to see the conditions.
>> There is absolutely no warranty for GDB. =A0Type "show warranty" for det=
ails.
>> This GDB was configured as "i386-marcel-freebsd"...
>>
>> Unread portion of the kernel message buffer:
>>
>>
>> Fatal trap 12: page fault while in kernel mode
>> cpuid =3D 0; apic id =3D 00
>> fault virtual address =A0 =3D 0x6c
>> fault code =A0 =A0 =A0 =A0 =A0 =A0 =A0=3D supervisor read, page not pres=
ent
>> instruction pointer =A0 =A0 =3D 0x20:0xc0a25dc0
>> stack pointer =A0 =A0 =A0 =A0 =A0 =3D 0x28:0xc4df5910
>> frame pointer =A0 =A0 =A0 =A0 =A0 =3D 0x28:0xc4df5954
>> code segment =A0 =A0 =A0 =A0 =A0 =A0=3D base 0x0, limit 0xfffff, type 0x=
1b
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=3D DPL 0, pres 1, def32 =
1, gran 1
>> processor eflags =A0 =A0 =A0 =A0=3D interrupt enabled, resume, IOPL =3D =
0
>> current process =A0 =A0 =A0 =A0 =3D 12 (irq256: em0:rx 0)
>> trap number =A0 =A0 =A0 =A0 =A0 =A0 =3D 12
>> panic: page fault
>> cpuid =3D 0
>> KDB: stack backtrace:
>> #0 0xc08380b7 at kdb_backtrace+0x47
>> #1 0xc0805617 at panic+0x117
>> #2 0xc0aebcc3 at trap_fatal+0x323
>> #3 0xc0aec802 at trap+0x182
>> #4 0xc0ad5f8c at calltrap+0x6
>> #5 0xc589f7cc at pfr_update_stats+0x1cc
>> #6 0xc588de21 at pf_test+0x981
>> #7 0xc5895e79 at pf_check_in+0x39
>> #8 0xc08c3c68 at pfil_run_hooks+0x78
>> #9 0xc08e18ae at ip_input+0x24e
>> #10 0xc08c2d9f at netisr_dispatch_src+0x8f
>> #11 0xc08c3040 at netisr_dispatch+0x20
>> #12 0xc08b9721 at ether_demux+0x171
>> #13 0xc08b9b6f at ether_nh_input+0x37f
>> #14 0xc08c2d9f at netisr_dispatch_src+0x8f
>> #15 0xc08c3040 at netisr_dispatch+0x20
>> #16 0xc08b9269 at ether_input+0x19
>> #17 0xc05b383f at em_rxeof+0x30f
>> Uptime: 1h45m44s
>> Physical memory: 2002 MB
>> Dumping 185 MB: 170 154 138 122 106 90 74 58 42 26 10
>>
>> Reading symbols from /boot/kernel/pf.ko...Reading symbols from
>> /boot/kernel/pf.ko.symbols...
>> done.
>> done.
>> Loaded symbols for /boot/kernel/pf.ko
>> #0 =A0doadump (textdump=3D1) at pcpu.h:244
>> 244 =A0 =A0 pcpu.h: No such file or directory.
>> =A0 =A0 =A0 =A0in pcpu.h
>> (kgdb) #0 =A0doadump (textdump=3D1) at pcpu.h:244
>> #1 =A00xc08053ba in kern_reboot (howto=3D260)
>> =A0 =A0at /usr/src/sys/kern/kern_shutdown.c:442
>> #2 =A00xc0805651 in panic (fmt=3DVariable "fmt" is not available.
>> ) at /usr/src/sys/kern/kern_shutdown.c:607
>> #3 =A00xc0aebcc3 in trap_fatal (frame=3D0xc4df58d0, eva=3D108)
>> =A0 =A0at /usr/src/sys/i386/i386/trap.c:975
>> #4 =A00xc0aec802 in trap (frame=3D0xc4df58d0) at /usr/src/sys/i386/i386/=
trap.c:352
>> #5 =A00xc0ad5f8c in calltrap () at /usr/src/sys/i386/i386/exception.s:16=
8
>> #6 =A00xc0a25dc0 in uma_zalloc_arg (zone=3D0x0, udata=3D0x0, flags=3D257=
)
>> =A0 =A0at pcpu.h:244
>> #7 =A00xc589f7cc in pfr_update_stats (kt=3D0xc58d44d8, a=3D0xc56aa01a, a=
f=3D2 '\002',
>> =A0 =A0len=3D52, dir_out=3D0, op_pass=3D0, notrule=3D0) at uma.h:305
>> #8 =A00xc588de21 in pf_test (dir=3D1, ifp=3D0xc5253c00, m0=3D0xc4df5acc,=
eh=3D0x0,
>> =A0 =A0inp=3D0x0) at /usr/src/sys/modules/pf/../../contrib/pf/net/pf.c:7=
057
>> #9 =A00xc5895e79 in pf_check_in (arg=3D0x0, m=3D0xc4df5acc, ifp=3D0xc525=
3c00, dir=3D1,
>> =A0 =A0inp=3D0x0) at /usr/src/sys/modules/pf/../../contrib/pf/net/pf_ioc=
tl.c:4139
>> #10 0xc08c3c68 in pfil_run_hooks (ph=3D0xc0d685e0, mp=3D0xc4df5b24,
>> =A0 =A0ifp=3D0xc5253c00, dir=3D1, inp=3D0x0) at /usr/src/sys/net/pfil.c:=
82
>> #11 0xc08e18ae in ip_input (m=3D0xc567db00)
>> =A0 =A0at /usr/src/sys/netinet/ip_input.c:510
>> #12 0xc08c2d9f in netisr_dispatch_src (proto=3D1, source=3D0, m=3D0xc567=
db00)
>> =A0 =A0at /usr/src/sys/net/netisr.c:1013
>> #13 0xc08c3040 in netisr_dispatch (proto=3D1, m=3D0xc567db00)
>> =A0 =A0at /usr/src/sys/net/netisr.c:1104
>> #14 0xc08b9721 in ether_demux (ifp=3D0xc5253c00, m=3D0xc567db00)
>> =A0 =A0at /usr/src/sys/net/if_ethersubr.c:937
>> #15 0xc08b9b6f in ether_nh_input (m=3D0xc567db00)
>> =A0 =A0at /usr/src/sys/net/if_ethersubr.c:756
>> #16 0xc08c2d9f in netisr_dispatch_src (proto=3D9, source=3D0, m=3D0xc567=
db00)
>> =A0 =A0at /usr/src/sys/net/netisr.c:1013
>> #17 0xc08c3040 in netisr_dispatch (proto=3D9, m=3D0xc567db00)
>> =A0 =A0at /usr/src/sys/net/netisr.c:1104
>> #18 0xc08b9269 in ether_input (ifp=3D0xc5253c00, m=3D0xc567db00)
>> =A0 =A0at /usr/src/sys/net/if_ethersubr.c:797
>> #19 0xc05b383f in em_rxeof (rxr=3D0xc520bc00, count=3D99, done=3D0x0)
>> =A0 =A0at /usr/src/sys/dev/e1000/if_em.c:4340
>> #20 0xc05b3a06 in em_msix_rx (arg=3D0xc520bc00)
>> =A0 =A0at /usr/src/sys/dev/e1000/if_em.c:1577
>> #21 0xc07da6eb in intr_event_execute_handlers (p=3D0xc5157588, ie=3D0xc5=
241680)
>> =A0 =A0at /usr/src/sys/kern/kern_intr.c:1257
>> #22 0xc07dbeaa in ithread_loop (arg=3D0xc52506e0)
>> =A0 =A0at /usr/src/sys/kern/kern_intr.c:1270
>> #23 0xc07d78f7 in fork_exit (callout=3D0xc07dbe30 <ithread_loop>,
>> =A0 =A0arg=3D0xc52506e0, frame=3D0xc4df5d28) at /usr/src/sys/kern/kern_f=
ork.c:995
>> #24 0xc0ad6004 in fork_trampoline () at /usr/src/sys/i386/i386/exception=
.s:275
>> (kgdb)
>>
>>
>> ################## pf.conf ##################
>> ext_if =3D "em0"
>>
>> public_tcp_ports =3D "{21,25,53,80,143,443,873,993,50021:50121}"
>> public_udp_ports =3D "53"
>>
>> table <secure> {someip}
>> table <ssh_brute> persist counters
>>
>> ### Redirection for SMTP
>> rdr on $ext_if proto tcp from any to $ext_if port 225 -> $ext_if port 25
>>
>> ### Block everything in an pass everything out
>> pass out on $ext_if all modulate state
>> block in on $ext_if all
>>
>> ### secure users
>> pass in quick on $ext_if proto tcp from <secure> to any flags S/SA \
>> modulate state
>>
>> ### public tcp/udp ports rules
>> pass in on $ext_if proto udp to $ext_if port $public_udp_ports
>> pass in on $ext_if proto tcp to $ext_if port $public_tcp_ports flags S/S=
A \
>> modulate state
>>
>> ### block ssh bruteforce
>> block in quick from <ssh_brute>
>> pass in quick on $ext_if proto tcp to $ext_if port 22 flags S/SA
>> modulate state \
>> (max-src-conn 5, max-src-conn-rate 10/60, overload <ssh_brute> flush glo=
bal)
>>
>> ### block icmp timestamp request/response
>> block in quick on $ext_if inet proto icmp all icmp-type {13, 14}
>> pass in quick on $ext_if proto icmp all
>>
>> ############ end pf.conf ##############
>>
>> --
>> Ali Mdidech
>> _______________________________________________
>> freebsd-pf@freebsd.org mailing list
>> http://lists.freebsd.org/mailman/listinfo/freebsd-pf
>> To unsubscribe, send any mail to "freebsd-pf-unsubscribe@freebsd.org"
>
>
>
> --
> Ermal
--=20
Ali Mdidech
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