Re: kern/125239: [gre] kernel crash when using gre

2010-02-17 Thread Jeff Mo 
The following reply was made to PR kern/125239; it has been noted by GNATS.

From: Jeff Mo 
To: bug-follo...@freebsd.org, damien.sau...@uclouvain.be
Cc:  
Subject: Re: kern/125239: [gre] kernel crash when using gre
Date: Wed, 17 Feb 2010 10:32:00 -0800

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 Hello all,
 
 I found the solution about why this bug occurs :
 <http://www.freebsd.org/cgi/query-pr.cgi?pr=125239&cat=>
 I would like to contribute my knowledge to FreeBSD website and you can
 find my solution in the attached. Please let me know your comment and
 look forward to your reply.
 
 Thanks,
 -- 
 Jeff Mo
 Santa Clara University
 Linux+, SCJP, SCWCD, MCSD
 
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freebsd-net@freebsd.org mailing

Question about "kern/125239: [gre] kernel crash when using gre"

2008-08-07 Thread Jeff Mo 
Hi Sir,

I am trying to dive deeper into the stack frames of  the following bug:
kern/125239: [gre] kernel crash when using greI use FreeBSD 7.0 and already
reproduce it, but I am not sure about what the following sentence means:
"ifp=Variable "ifp" is not available"?

I will be very thankful if anyone can give me some instruction.

Regards
Jeff

==

(kgdb) f 7
#7  0xc082263b in in_ifinit (ccc.
) at /usr/src/sys/netinet/in.c:817
817 if (rtinitflags(ia)) {
(kgdb) info f
Stack level 7, frame at 0xd22f3b58:
 eip = 0xc082263b in in_ifinit (/usr/src/sys/netinet/in.c:817);
saved eip 0xc0823607
 called by frame at 0xd22f3bb8, caller of frame at 0xd22f3ad4
 source language c.
 Arglist at 0xd22f3b50, args: ifp=Variable "ifp" is not available.
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Need Help!

2008-08-16 Thread Jeff Mo 
Dear All ,

After I run the following commands three times,

  1 ifconfig gre0 create
  2 ifconfig gre0 tunnel 10.101.1.1 10.101.1.2 netmask 255.255.255.255
  3 ifconfig gre0 destroy

I found something weird:

   1. in /var/log/messages , line 907 , there should be TAILQ_REMOVE because
   of  ifconfig gre0 destroy, but nothing happened.
   2. when i do the command second time, ia1=0xc2df1600 supposed not be
   there.
   3. Some thing wrong with line 914,915,920,921,931,932,937,938
   4. does "ifconfig gre0 destroy" causes TAILQ_REMOVE be called?

Please nicely give me some comments.

Thanks and Regards
Jeff

/var/log/messages

first time

895 Aug 16 16:30:11 JeffMo kernel: TAILQ_INSERT_TAIL:ia=0xc2df1600
896 Aug 16 16:30:11 JeffMo kernel:
TAILQ_INSERT_TAIL:ia->ia_ifp=0xc27d6c00
897 Aug 16 16:30:11 JeffMo kernel: before TAILQ_FOREACH:ia1=0xc28e6b00
898 Aug 16 16:30:11 JeffMo kernel: before
TAILQ_FOREACH:ia1->ia_ifp=0xc2824400
899 Aug 16 16:30:11 JeffMo kernel: before TAILQ_FOREACH:ia1=0xc298ca00
900 Aug 16 16:30:11 JeffMo kernel: before
TAILQ_FOREACH:ia1->ia_ifp=0xc27d6000
901 Aug 16 16:30:11 JeffMo kernel: after TAILQ_FOREACH:ia1=0xc28e6b00
902 Aug 16 16:30:11 JeffMo kernel: after
TAILQ_FOREACH:ia1->ia_ifp=0xc2824400
903 Aug 16 16:30:11 JeffMo kernel: after TAILQ_FOREACH:ia1=0xc298ca00
904 Aug 16 16:30:11 JeffMo kernel: after
TAILQ_FOREACH:ia1->ia_ifp=0xc27d6000
905 Aug 16 16:30:11 JeffMo kernel: after TAILQ_FOREACH:ia1=0xc2df1600
906 Aug 16 16:30:11 JeffMo kernel: after
TAILQ_FOREACH:ia1->ia_ifp=0xc27d6c00
907 Aug 16 16:30:11 JeffMo kernel:

second time

908 Aug 16 16:30:34 JeffMo kernel: TAILQ_INSERT_TAIL:ia=0xc3144d00
909 Aug 16 16:30:34 JeffMo kernel:
TAILQ_INSERT_TAIL:ia->ia_ifp=0xc27d1c00
910 Aug 16 16:30:34 JeffMo kernel: before TAILQ_FOREACH:ia1=0xc28e6b00
911 Aug 16 16:30:34 JeffMo kernel: before
TAILQ_FOREACH:ia1->ia_ifp=0xc2824400
912 Aug 16 16:30:34 JeffMo kernel: before TAILQ_FOREACH:ia1=0xc298ca00
913 Aug 16 16:30:34 JeffMo kernel: before
TAILQ_FOREACH:ia1->ia_ifp=0xc27d6000
914 Aug 16 16:30:34 JeffMo kernel: before TAILQ_FOREACH:ia1=0xc2df1600
915 Aug 16 16:30:34 JeffMo kernel: before
TAILQ_FOREACH:ia1->ia_ifp=0x3e391
916 Aug 16 16:30:34 JeffMo kernel: after TAILQ_FOREACH:ia1=0xc28e6b00
917 Aug 16 16:30:34 JeffMo kernel: after
TAILQ_FOREACH:ia1->ia_ifp=0xc2824400
918 Aug 16 16:30:34 JeffMo kernel: after TAILQ_FOREACH:ia1=0xc298ca00
919 Aug 16 16:30:34 JeffMo kernel: after
TAILQ_FOREACH:ia1->ia_ifp=0xc27d6000
920 Aug 16 16:30:34 JeffMo kernel: after TAILQ_FOREACH:ia1=0xc2df1600
921 Aug 16 16:30:34 JeffMo kernel: after
TAILQ_FOREACH:ia1->ia_ifp=0x3e391
922 Aug 16 16:30:34 JeffMo kernel: after TAILQ_FOREACH:ia1=0xc3144d00
923 Aug 16 16:30:34 JeffMo kernel: after
TAILQ_FOREACH:ia1->ia_ifp=0xc27d1c00
924 Aug 16 16:30:34 JeffMo kernel:

third time

   925 Aug 16 16:30:57 JeffMo kernel: TAILQ_INSERT_TAIL:ia=0xc3145800
926 Aug 16 16:30:57 JeffMo kernel:
TAILQ_INSERT_TAIL:ia->ia_ifp=0xc2812400
927 Aug 16 16:30:57 JeffMo kernel: before TAILQ_FOREACH:ia1=0xc28e6b00
928 Aug 16 16:30:57 JeffMo kernel: before
TAILQ_FOREACH:ia1->ia_ifp=0xc2824400
929 Aug 16 16:30:57 JeffMo kernel: before TAILQ_FOREACH:ia1=0xc298ca00
930 Aug 16 16:30:57 JeffMo kernel: before
TAILQ_FOREACH:ia1->ia_ifp=0xc27d6000
931 Aug 16 16:30:57 JeffMo kernel: before TAILQ_FOREACH:ia1=0xc2df1600
932 Aug 16 16:30:57 JeffMo kernel: before TAILQ_FOREACH:ia1->ia_ifp=0
933 Aug 16 16:30:57 JeffMo kernel: after TAILQ_FOREACH:ia1=0xc28e6b00
934 Aug 16 16:30:57 JeffMo kernel: after
TAILQ_FOREACH:ia1->ia_ifp=0xc2824400
935 Aug 16 16:30:57 JeffMo kernel: after TAILQ_FOREACH:ia1=0xc298ca00
936 Aug 16 16:30:57 JeffMo kernel: after
TAILQ_FOREACH:ia1->ia_ifp=0xc27d6000
937 Aug 16 16:30:57 JeffMo kernel: after TAILQ_FOREACH:ia1=0xc2df1600
938 Aug 16 16:30:57 JeffMo kernel: after TAILQ_FOREACH:ia1->ia_ifp=0

#diff -uw in.c.ori in.c

--- in.c.ori2008-08-16 13:50:54.0 +
+++ in.c2008-08-16 16:43:29.0 +
@@ -320,7 +320,23 @@
 ia->ia_broadaddr.sin_family = AF_INET;
 }
 ia->ia_ifp = ifp;
+//add by jeff:start
+ printf("TAILQ_INSERT_TAIL:ia=%p\n" , ia);
+printf("TAILQ_INSERT_TAIL:ia->ia_ifp=%p\n" , ia->ia_ifp);
+struct in_ifaddr *ia1;
+TAILQ_FOREACH(ia1, &in_ifaddrhead, ia_link) {
+ printf("before TAILQ_FOREACH:ia1=%p\n" , ia1);
+ printf("before TAILQ_FOREACH:ia1->ia_ifp=%p\n" ,
ia1->ia_ifp);
+}
+//add by jeff:end
 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link);
+//add by jeff:start
+TAILQ_FOREACH(ia1, &in_ifaddrhead, ia_link) {
+ printf("after TAILQ_FOREACH:ia1=%p\n" , ia1);
+