Date: Wed, 25 Mar 2015 14:48:32 -0700 From: hiren panchasara <hiren@strugglingcoder.info> To: freebsd-net@freebsd.org Cc: ae@freebsd.org, hrs@freebsd.org, nitroboost@gmail.com Subject: pagefault in IPv6 codepath in defrouter_select() Message-ID: <20150325214832.GI53237@strugglingcoder.info>
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We are seeing following panic with "Panic String: page fault" on a month
old stable/10 tree:
kgdb) #0 doadump (textdump=3D1) at pcpu.h:219
#1 0xffffffff80746307 in kern_reboot (howto=3D260)
at /usr/src/sys/kern/kern_shutdown.c:452
#2 0xffffffff807466e4 in panic (fmt=3D<value optimized out>)
at /usr/src/sys/kern/kern_shutdown.c:759
#3 0xffffffff80a9ab5f in trap_fatal (frame=3D<value optimized out>,=20
eva=3D<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:859
#4 0xffffffff80a9ae5d in trap_pfault (frame=3D0xfffffe000038eef0,=20
usermode=3D<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:676
#5 0xffffffff80a9a4da in trap (frame=3D0xfffffe000038eef0)
at /usr/src/sys/amd64/amd64/trap.c:440
#6 0xffffffff80a804e2 in calltrap ()
at /usr/src/sys/amd64/amd64/exception.S:236
#7 0xffffffff80744ab3 in __rw_rlock (c=3D0x100b421, file=3D0x0, line=3D0)
at /usr/src/sys/kern/kern_rwlock.c:378
#8 0xffffffff80887193 in defrouter_select ()
at /usr/src/sys/netinet6/nd6_rtr.c:640
#9 0xffffffff80885b58 in nd6_ra_input (m=3D<value optimized out>,=20
off=3D<value optimized out>, icmp6len=3D<value optimized out>)
at /usr/src/sys/netinet6/nd6_rtr.c:796
#10 0xffffffff8085fa9f in icmp6_input (mp=3D<value optimized out>,=20
offp=3D0xfffffe000038f66c, proto=3D<value optimized out>)
at /usr/src/sys/netinet6/icmp6.c:814
#11 0xffffffff80874e6c in ip6_input (m=3D0xfffff800269e8a00)
at /usr/src/sys/netinet6/ip6_input.c:1019
#12 0xffffffff808144a2 in netisr_dispatch_src (proto=3D<value optimized out=
>,=20
source=3D<value optimized out>, m=3D0x0) at /usr/src/sys/net/netisr.c:9=
72
#13 0xffffffff8080ce66 in ether_demux (ifp=3D<value optimized out>,=20
m=3D0xfffff800269e8a00) at /usr/src/sys/net/if_ethersubr.c:851
#14 0xffffffff8080daf9 in ether_nh_input (m=3D<value optimized out>)
at /usr/src/sys/net/if_ethersubr.c:646
#15 0xffffffff808144a2 in netisr_dispatch_src (proto=3D<value optimized out=
>,=20
source=3D<value optimized out>, m=3D0x0) at /usr/src/sys/net/netisr.c:9=
72
#16 0xffffffff80437a98 in igb_rxeof (count=3D99)
at /usr/src/sys/dev/e1000/if_igb.c:4808
#17 0xffffffff80438131 in igb_msix_que (arg=3D0xfffff8000e6efa08)
at /usr/src/sys/dev/e1000/if_igb.c:1621
#18 0xffffffff80716e4b in intr_event_execute_handlers (
p=3D<value optimized out>, ie=3D0xfffff8000e6ea500)
at /usr/src/sys/kern/kern_intr.c:1264
#19 0xffffffff807177e6 in ithread_loop (arg=3D0xfffff8000e6f5e00)
at /usr/src/sys/kern/kern_intr.c:1277
#20 0xffffffff80714a6a in fork_exit (
callout=3D0xffffffff80717750 <ithread_loop>, arg=3D0xfffff8000e6f5e00,=
=20
frame=3D0xfffffe000038fac0) at /usr/src/sys/kern/kern_fork.c:1017
#21 0xffffffff80a80a1e in fork_trampoline ()
at /usr/src/sys/amd64/amd64/exception.S:611
#22 0x0000000000000000 in ?? ()
Current language: auto; currently minimal
(kgdb) f 7
#7 0xffffffff80744ab3 in __rw_rlock (c=3D0x100b421, file=3D0x0, line=3D0)
at /usr/src/sys/kern/kern_rwlock.c:378
378 spin_cnt++;
(kgdb) p spin_cnt=20
$6 =3D 1
(kgdb)=20
This is 3rd occurence of this panic. What could be the cause?
I have vmcore and can provide more info if needed.
Cheers,
Hiren
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