Charles Duffy
2005-Nov-14 02:55 UTC
[Xen-devel] xentop segfault -- xenstat_domain_name returning a null pointer?
# xm list
Name ID Mem(MiB) VCPUs State Time(s)
Domain-0 0 512 1 r----- 41.8
demo-1 1 1024 1 -b---- 23.5
demo-2 2 1024 1 -b---- 23.1
demo-db 3 2048 1 -b---- 18.3
demo-vnc 4 768 1 -b---- 8.2
# gdb ./xentop
...
(gdb) run
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 16384 (LWP 9196)]
0x00002aaaaae9253f in strcasecmp () from /lib/libc.so.6
(gdb) bt
#0 0x00002aaaaae9253f in strcasecmp () from /lib/libc.so.6
#1 0x0000000000401f51 in compare_name (domain1=0x5248d0, domain2=0x524920)
at xentop.c:351
#2 0x0000000000401f1e in compare_domains (domain1=0x524a70,
domain2=0x524a78)
at xentop.c:343
#3 0x00002aaaaae541ed in bsearch () from /lib/libc.so.6
#4 0x00002aaaaae540e4 in bsearch () from /lib/libc.so.6
#5 0x00002aaaaae543c9 in qsort () from /lib/libc.so.6
#6 0x00000000004030aa in top () at xentop.c:788
#7 0x0000000000403346 in main (argc=1, argv=0x7fffffe4dd38) at xentop.c:873
(gdb) up
#1 0x0000000000401f51 in compare_name (domain1=0x5248d0, domain2=0x524920)
at xentop.c:351
351 return strcasecmp(xenstat_domain_name(domain1),
xenstat_domain_name(domain2));
(gdb) print xenstat_domain_name(domain1)
$5 = 0
(gdb) print xenstat_domain_name(domain2)
$6 = 5393056
(gdb) print (char*)xenstat_domain_name(domain2)
$7 = 0x524aa0 "demo-1"
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David Hendricks
2005-Nov-16 06:02 UTC
Re: [Xen-devel] xentop segfault -- xenstat_domain_name returning a null pointer?
Hello Mr. Duffy, Thank you for your detailed report on this problem. Unfortunately I am bogged down with projects for school at the moment, but I will ping my colleagues and see if we can get a solution for this by the end of the week. On Sun, 13 Nov 2005 20:55:40 -0600 Charles Duffy <cduffy@spamcop.net> wrote:> # xm list > Name ID Mem(MiB) VCPUs State Time(s) > Domain-0 0 512 1 r----- 41.8 > demo-1 1 1024 1 -b---- 23.5 > demo-2 2 1024 1 -b---- 23.1 > demo-db 3 2048 1 -b---- 18.3 > demo-vnc 4 768 1 -b---- 8.2 > # gdb ./xentop > ... > (gdb) run > Program received signal SIGSEGV, Segmentation fault. > [Switching to Thread 16384 (LWP 9196)] > 0x00002aaaaae9253f in strcasecmp () from /lib/libc.so.6 > (gdb) bt > #0 0x00002aaaaae9253f in strcasecmp () from /lib/libc.so.6 > #1 0x0000000000401f51 in compare_name (domain1=0x5248d0, > domain2=0x524920) at xentop.c:351 > #2 0x0000000000401f1e in compare_domains (domain1=0x524a70, > domain2=0x524a78) > at xentop.c:343 > #3 0x00002aaaaae541ed in bsearch () from /lib/libc.so.6 > #4 0x00002aaaaae540e4 in bsearch () from /lib/libc.so.6 > #5 0x00002aaaaae543c9 in qsort () from /lib/libc.so.6 > #6 0x00000000004030aa in top () at xentop.c:788 > #7 0x0000000000403346 in main (argc=1, argv=0x7fffffe4dd38) at > xentop.c:873 (gdb) up > #1 0x0000000000401f51 in compare_name (domain1=0x5248d0, > domain2=0x524920) at xentop.c:351 > 351 return strcasecmp(xenstat_domain_name(domain1), > xenstat_domain_name(domain2)); > (gdb) print xenstat_domain_name(domain1) > $5 = 0 > (gdb) print xenstat_domain_name(domain2) > $6 = 5393056 > (gdb) print (char*)xenstat_domain_name(domain2) > $7 = 0x524aa0 "demo-1" > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel--------- David _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Jerone Young
2005-Nov-16 17:23 UTC
Re: [Xen-devel] xentop segfault -- xenstat_domain_name returning a null pointer?
This is odd if this is the case then you somehow you do not have a name for your Domain-0 domain in xenstore. Not sure how exactly you get into this situation. Are you still seeing this...grabbing todays hg build? I am unable to reproduce your problem on any of my systems. If need be can add a check in the code to for NULL names...but the tools do not allow you to have a domain without a name. On Sun, 2005-11-13 at 20:55 -0600, Charles Duffy wrote:> # xm list > Name ID Mem(MiB) VCPUs State Time(s) > Domain-0 0 512 1 r----- 41.8 > demo-1 1 1024 1 -b---- 23.5 > demo-2 2 1024 1 -b---- 23.1 > demo-db 3 2048 1 -b---- 18.3 > demo-vnc 4 768 1 -b---- 8.2 > # gdb ./xentop > ... > (gdb) run > Program received signal SIGSEGV, Segmentation fault. > [Switching to Thread 16384 (LWP 9196)] > 0x00002aaaaae9253f in strcasecmp () from /lib/libc.so.6 > (gdb) bt > #0 0x00002aaaaae9253f in strcasecmp () from /lib/libc.so.6 > #1 0x0000000000401f51 in compare_name (domain1=0x5248d0, domain2=0x524920) > at xentop.c:351 > #2 0x0000000000401f1e in compare_domains (domain1=0x524a70, > domain2=0x524a78) > at xentop.c:343 > #3 0x00002aaaaae541ed in bsearch () from /lib/libc.so.6 > #4 0x00002aaaaae540e4 in bsearch () from /lib/libc.so.6 > #5 0x00002aaaaae543c9 in qsort () from /lib/libc.so.6 > #6 0x00000000004030aa in top () at xentop.c:788 > #7 0x0000000000403346 in main (argc=1, argv=0x7fffffe4dd38) at xentop.c:873 > (gdb) up > #1 0x0000000000401f51 in compare_name (domain1=0x5248d0, domain2=0x524920) > at xentop.c:351 > 351 return strcasecmp(xenstat_domain_name(domain1), > xenstat_domain_name(domain2)); > (gdb) print xenstat_domain_name(domain1) > $5 = 0 > (gdb) print xenstat_domain_name(domain2) > $6 = 5393056 > (gdb) print (char*)xenstat_domain_name(domain2) > $7 = 0x524aa0 "demo-1" > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel >_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel