Date: Fri, 10 Aug 2001 00:34:11 +0200 (CEST) From: Thomas Quinot <thomas@cuivre.fr.eu.org> To: FreeBSD-gnats-submit@freebsd.org Subject: kern/29583: 4.4-PREREL/ipf 3.4.20: 'to' rule with tun causes crash Message-ID: <20010809223411.BD95424D46@melusine.cuivre.fr.eu.org>
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>Number: 29583
>Category: kern
>Synopsis: 4.4-PREREL/ipf 3.4.20: 'to' rule with tun causes crash
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Aug 09 15:40:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Thomas Quinot
>Release: FreeBSD 4.4-PRERELEASE i386
>Organization:
>Environment:
System: FreeBSD melusine.cuivre.fr.eu.org 4.4-PRERELEASE FreeBSD 4.4-PRERELEASE #9: Thu Aug 9 17:33:53 CEST 2001 thomas@melusine.cuivre.fr.eu.org:/usr/obj/usr/src/sys/MELUSINE i386
>Description:
I have an ipf rule that performs routing based on source address
(for VPN purposes, using a pipsec tunnel) :
block out log quick on tun0 to tun1:10.3.0.1
from VPN.IP.ADDR.ESS/32 to any group 11
(group 11 is the outbound group. When an outbound packet has the
VPN tunnel interface address as its source, route it back through
the VPN tunnel (tun1) instead of the default route (tun0)).
This rule used to work as expected with ipfilter 3.4.16 under
FreeBSD 4.3-STABLE. With 4.4-PRERELEASE (ipfilter 3.4.20), it
freezes the machine. On one of my attempts, I obtained a
kernel crash dump. One possible hypothesis is that ipfilter
has corrupted an mbuf while moving the packet from one
interface to another:
Script started on Fri Aug 10 00:00:56 2001
$ gdb -k /usr/obj/usr/src/sys/MELUSINE/kernel.debug vmcore.5
GNU gdb 4.18
Copyright 1998 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 conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-unknown-freebsd"...
IdlePTD 4108288
initial pcb at 344dc0
panicstr: page fault
panic messages:
---
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x6c2f6c71
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc018b2af
stack pointer = 0x10:0xc8f4ad88
frame pointer = 0x10:0xc8f4ad98
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 = 518 (pipsecd)
interrupt mask = net
trap number = 12
panic: page fault
syncing disks... 19
done
Uptime: 26m53s
dumping to dev #ad/0x20009, offset 270360
dump ata0: resetting devices .. done
127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 [CTRL-C to abort] 42 [CTRL-C to abort] 41 [CTRL-C to abort] 40 [CTRL-C to abort] 39 [CTRL-C to abort] 38 [CTRL-C to abort] 37 [CTRL-C to abort] 36 [CTRL-C to abort] 35 34 [CTRL-C to abort] 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
---
#0 dumpsys () at /usr/src/sys/kern/kern_shutdown.c:472
472 if (dumping++) {
(kgdb) bt
#0 dumpsys () at /usr/src/sys/kern/kern_shutdown.c:472
#1 0xc016fbfd in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:312
#2 0xc016ffe5 in panic (fmt=0xc02f928c "%s")
at /usr/src/sys/kern/kern_shutdown.c:580
#3 0xc02ae91b in trap_fatal (frame=0xc8f4ad48, eva=1815047281)
at /usr/src/sys/i386/i386/trap.c:951
#4 0xc02ae5d5 in trap_pfault (frame=0xc8f4ad48, usermode=0, eva=1815047281)
at /usr/src/sys/i386/i386/trap.c:844
#5 0xc02ae17f in trap (frame={tf_fs = 134479888, tf_es = -1065877488,
tf_ds = -923533296, tf_edi = 6685184, tf_esi = 1815047265,
tf_ebp = -923488872, tf_isp = -923488908, tf_ebx = -1065820160,
tf_edx = 6685184, tf_ecx = -923488560, tf_eax = 6685184, tf_trapno = 12,
tf_err = 0, tf_eip = -1072123217, tf_cs = 8, tf_eflags = 66054,
tf_esp = -1065820160, tf_ss = -1065820160})
at /usr/src/sys/i386/i386/trap.c:443
#6 0xc018b2af in m_freem (m=0x6c2f6c61) at /usr/src/sys/kern/uipc_mbuf.c:618
#7 0xc018b2cd in m_freem (m=0xc0759700) at /usr/src/sys/kern/uipc_mbuf.c:618
#8 0xc01b5c0a in tunread (dev=0xc0cc1e80, uio=0xc8f4aed0, flag=8323072)
at /usr/src/sys/net/if_tun.c:584
#9 0xc01a7e27 in spec_read (ap=0xc8f4ae5c)
at /usr/src/sys/miscfs/specfs/spec_vnops.c:253
#10 0xc0242888 in ufsspec_read (ap=0xc8f4ae5c)
at /usr/src/sys/ufs/ufs/ufs_vnops.c:1834
---Type <return> to continue, or q <return> to quit---
#11 0xc0242e7d in ufs_vnoperatespec (ap=0xc8f4ae5c)
at /usr/src/sys/ufs/ufs/ufs_vnops.c:2391
#12 0xc01a3daf in vn_read (fp=0xc0d67f80, uio=0xc8f4aed0, cred=0xc0731880,
flags=0, p=0xc8edba40) at vnode_if.h:334
#13 0xc017e149 in dofileread (p=0xc8edba40, fp=0xc0d67f80, fd=9,
buf=0x804e660, nbyte=4096, offset=-1, flags=0)
at /usr/src/sys/sys/file.h:146
#14 0xc017e00a in read (p=0xc8edba40, uap=0xc8f4af80)
at /usr/src/sys/kern/sys_generic.c:117
#15 0xc02aebba in syscall2 (frame={tf_fs = 47, tf_es = 47, tf_ds = 47,
tf_edi = 134538848, tf_esi = 0, tf_ebp = -1077936800,
tf_isp = -923488300, tf_ebx = 9, tf_edx = 134538496, tf_ecx = 134538532,
tf_eax = 3, tf_trapno = 7, tf_err = 2, tf_eip = 672790868, tf_cs = 31,
tf_eflags = 518, tf_esp = -1077937148, tf_ss = 47})
at /usr/src/sys/i386/i386/trap.c:1150
#16 0xc029fdd5 in Xint0x80_syscall ()
#17 0x80490ef in ?? ()
(kgdb) fr 8
#8 0xc01b5c0a in tunread (dev=0xc0cc1e80, uio=0xc8f4aed0, flag=8323072)
at /usr/src/sys/net/if_tun.c:584
584 m_freem(m0);
(kgdb) list
579 m0 = m;
580 }
581
582 if (m0) {
583 TUNDEBUG("%s%d: Dropping mbuf\n", ifp->if_name, ifp->if_unit);
584 m_freem(m0);
585 }
586 return error;
587 }
588
(kgdb) print ifp
$1 = (struct ifnet *) 0xc0d5c308
(kgdb) print *ifp
$2 = {if_softc = 0xc0d5c300, if_name = 0xc02d5d20 "tun", if_link = {
tqe_next = 0x0, tqe_prev = 0xc0cfef10}, if_addrhead = {
tqh_first = 0xc0d5c200, tqh_last = 0xc0d69c60}, if_pcount = 0,
if_bpf = 0x0, if_index = 5, if_unit = 1, if_timer = 0, if_flags = -32687,
if_ipending = 0, if_linkmib = 0x0, if_linkmiblen = 0, if_data = {
ifi_type = 23 '\027', ifi_physical = 0 '\000', ifi_addrlen = 0 '\000',
ifi_hdrlen = 0 '\000', ifi_recvquota = 0 '\000', ifi_xmitquota = 0 '\000',
ifi_mtu = 1500, ifi_metric = 0, ifi_baudrate = 0, ifi_ipackets = 999,
ifi_ierrors = 0, ifi_opackets = 1127, ifi_oerrors = 0, ifi_collisions = 0,
ifi_ibytes = 139268, ifi_obytes = 1176565, ifi_imcasts = 0,
ifi_omcasts = 0, ifi_iqdrops = 0, ifi_noproto = 0, ifi_hwassist = 0,
ifi_unused = 0, ifi_lastchange = {tv_sec = 997392138, tv_usec = 502288}},
if_multiaddrs = {lh_first = 0xc0d54c20}, if_amcount = 0,
if_output = 0xc01b53f8 <tunoutput>, if_start = 0, if_done = 0,
if_ioctl = 0xc01b52a0 <tunifioctl>, if_watchdog = 0, if_poll_recv = 0,
if_poll_xmit = 0, if_poll_intren = 0, if_poll_slowinput = 0, if_init = 0,
if_resolvemulti = 0, if_snd = {ifq_head = 0x0, ifq_tail = 0x0, ifq_len = 0,
ifq_maxlen = 50, ifq_drops = 0}, if_poll_slowq = 0x0, if_prefixhead = {
tqh_first = 0x0, tqh_last = 0xc0d5c3d8}}
(kgdb) fr 6
#6 0xc018b2af in m_freem (m=0x6c2f6c61) at /usr/src/sys/kern/uipc_mbuf.c:618
618 MFREE(m, n);
Note: This was also reported as FreeBSD PR kern/
>How-To-Repeat:
Create a rule set with a 'to' rule diverting packets from one tun
interface to another tun interface [it is unknown whether this
problem occurs with non-tun interfaces].
Trigger the rule by sending out a matching packet.
>Fix:
None known.
>Release-Note:
>Audit-Trail:
>Unformatted:
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