[Bug 205678] [panic] Fatal trap 12: page fault while in kernel mode (in function rtsock_addrmsg)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205678

Graham Perrin  changed:

   What|Removed |Added

   Keywords||crash

--- Comment #2 from Graham Perrin  ---
Keyword: 

crash

– in lieu of summary line prefix: 

[panic]

* bulk change for the keyword
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[Bug 205678] [panic] Fatal trap 12: page fault while in kernel mode (in function rtsock_addrmsg)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205678

Niclas Zeising  changed:

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 CC||zeis...@freebsd.org

--- Comment #1 from Niclas Zeising  ---
Is this still relevant?

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[Bug 205678] [panic] Fatal trap 12: page fault while in kernel mode (in function rtsock_addrmsg)

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205678

Bug ID: 205678
   Summary: [panic] Fatal trap 12: page fault while in kernel mode
(in function rtsock_addrmsg)
   Product: Base System
   Version: 10.2-RELEASE
  Hardware: amd64
OS: Any
Status: New
  Severity: Affects Only Me
  Priority: ---
 Component: kern
  Assignee: freebsd-b...@freebsd.org
  Reporter: aga...@rail.net.ru
CC: freebsd-amd64@FreeBSD.org
CC: freebsd-amd64@FreeBSD.org

I've used an openconnect to connect to my work via vpn.

tun1: flags=8051 metric 0 mtu 1406
options=8
inet 10.21.9.162 --> 10.21.9.162 netmask 0x
nd6 options=29
Opened by PID 42635

every 30 minutes this connection disconnecting (for security reasons by
server), and reinstalling again by cron.
Every 24 hours disconnecting this tunnel causes page fault in kernel in
function: rtsock_addrmsg
/usr/src/sys/net/rtsock.c:line1345> info.rti_info[RTAX_IFP] =
ifp->if_addr->ifa_addr;

logs contains:
Dec 29 03:43:36 rail devd: Processing event '!system=IFNET subsystem=tun1
type=DETACH'
Dec 29 03:43:36 rail kernel:
Dec 29 03:43:36 rail kernel:
Dec 29 03:43:36 rail kernel: Fatal trap 12: page fault while in kernel mode
Dec 29 03:43:36 rail devd: Pushing table
Dec 29 03:43:36 rail devd: Processing notify event
Dec 29 03:43:36 rail devd: Popping table
Dec 29 03:45:14 rail syslogd: restart

in core.txt:
Unread portion of the kernel message buffer:
processor eflags= interrupt enabled, resume, IOPL = 0
current process = 2593 (openconnect)
trap number = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
#0 0x809960c0 at kdb_backtrace+0x60
#1 0x80959306 at vpanic+0x126
#2 0x809591d3 at panic+0x43
#3 0x80d8096b at trap_fatal+0x36b
#4 0x80d80c6d at trap_pfault+0x2ed
#5 0x80d8030a at trap+0x47a
#6 0x80d66682 at calltrap+0x8
#7 0x80a31767 at rtinit+0x5a7
#8 0x80a27e88 at tunclose+0x1c8
#9 0x80838403 at devfs_close+0x313
#10 0x80ea8861 at VOP_CLOSE_APV+0xa1
#11 0x80a0bcc3 at vn_close+0x133
#12 0x80a0ab08 at vn_closefile+0x48
#13 0x80839cfc at devfs_close_f+0x2c
#14 0x8090e749 at _fdrop+0x29
#15 0x80910fee at closef+0x21e
#16 0x8090eaf8 at closefp+0x98
#17 0x80d81287 at amd64_syscall+0x357
Uptime: 23h53m32s

my temporary patch:
-- info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
++if ( !sa )
++return (EFAULT);
++
++info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;


here is the backtrace:
(kgdb) bt
#0  doadump (textdump=) at pcpu.h:219
#1  0x80958f62 in kern_reboot (howto=260)
at /usr/src/sys/kern/kern_shutdown.c:451
#2  0x80959345 in vpanic (fmt=,
ap=) at /usr/src/sys/kern/kern_shutdown.c:758
#3  0x809591d3 in panic (fmt=0x0)
at /usr/src/sys/kern/kern_shutdown.c:687
#4  0x80d8096b in trap_fatal (frame=,
eva=) at /usr/src/sys/amd64/amd64/trap.c:851
#5  0x80d80c6d in trap_pfault (frame=0xfe0072a68500,
usermode=) at /usr/src/sys/amd64/amd64/trap.c:674
#6  0x80d8030a in trap (frame=0xfe0072a68500)
at /usr/src/sys/amd64/amd64/trap.c:440
#7  0x80d66682 in calltrap ()
at /usr/src/sys/amd64/amd64/exception.S:236
#8  0x80a32085 in rtsock_addrmsg (cmd=,
ifa=0xf800493bc400, fibnum=3) at /usr/src/sys/net/rtsock.c:1345
#9  0x80a31767 in rtinit (ifa=0xf800493bc400, cmd=2, flags=0)
at /usr/src/sys/net/route.c:1701
#10 0x80a27e88 in tunclose (dev=, foo=96, bar=3,
td=0x0) at /usr/src/sys/net/if_tun.c:478
#11 0x80838403 in devfs_close (ap=0xfe0072a688e0)
at /usr/src/sys/fs/devfs/devfs_vnops.c:618
---Type  to continue, or q  to quit---
#12 0x80ea8861 in VOP_CLOSE_APV (vop=,
a=) at vnode_if.c:535
#13 0x80a0bcc3 in vn_close (vp=0xf8005c97c938, flags=7,
file_cred=0xf800504b3c00, td=0xf80012e9e4a0) at vnode_if.h:225
#14 0x80a0ab08 in vn_closefile (fp=0xf8004cbf0370,
td=0xf80012e9e4a0) at /usr/src/sys/kern/vfs_vnops.c:1566
#15 0x80839cfc in devfs_close_f (fp=0xf8004cbf0370, td=0x60)
at /usr/src/sys/fs/devfs/devfs_vnops.c:637
#16 0x8090e749 in _fdrop (fp=0xf8004cbf0370, td=0x60) at file.h:343
#17 0x80910fee in closef (fp=,
td=) at /usr/src/sys/kern/kern_descrip.c:2338
#18 0x8090eaf8 in closefp (fdp=0xf80012eff000,
fd=, fp=0xf8004cbf0370, td=0xf80012e9e4a0,
holdleaders=) at /usr/src/sys/kern/kern_descrip.c:1194
#19 0x80d81287 in amd64_syscall (td=0xf80012e9e4a0, traced=0)
at subr_syscall.c:134
#20 0x80d6696b in Xfast_syscall ()
at