[panic] Duplicate free of item ... from zone ... (mbuf_packet)
Peter Kostouros
kpeter at melbpc.org.au
Sun Apr 1 03:36:08 UTC 2007
Hi
I have attached a debug session I hope someone finds useful in tracking
the problem. I have noticed intermittent panics for about a month which
may or may not be related, but the panics seem to occur while
downloading (and or uploading).
My sources are from 30MAR2007.
Please let me know if I can provide further information.
--
Regards
Peter
As always the organisation disavows knowledge of this email
-------------- next part --------------
Script started on Sun Apr 1 12:38:04 2007
baron# exitkgdb -c /var/crash/vmcore.159 -f /boot/kernel/kernel
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 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-marcel-freebsd".
Unread portion of the kernel message buffer:
Slab at 0xc456bfa8, freei 7 = 0.
panic: Duplicate free of item 0xc456b700 from zone 0xc1462b40(mbuf_packet)
cpuid = 0
Uptime: 2h51m45s
Physical memory: 1011 MB
Dumping 167 MB: 152 136 120 104 88 72 56 40 24 8
#0 doadump () at pcpu.h:172
172 pcpu.h: No such file or directory.
in pcpu.h
(kgdb) where
#0 doadump () at pcpu.h:172
#1 0xc0787a5a in boot (howto=260) at /mnt/cvs/FreeBSD/usr/src/sys/kern/kern_shutdown.c:409
#2 0xc0787e21 in panic (fmt=0xc0aa836d "Duplicate free of item %p from zone %p(%s)\n")
at /mnt/cvs/FreeBSD/usr/src/sys/kern/kern_shutdown.c:563
#3 0xc093aaab in uma_dbg_free (zone=0xc1462b40, slab=0xc456bfa8, item=0xc456b700)
at /mnt/cvs/FreeBSD/usr/src/sys/vm/uma_dbg.c:302
#4 0xc0938bea in uma_zfree_arg (zone=0xc1462b40, item=0xc456b700, udata=0x0)
at /mnt/cvs/FreeBSD/usr/src/sys/vm/uma_core.c:2261
#5 0xc07dac88 in mb_free_ext (m=0xc456b700) at uma.h:305
#6 0xc07daab0 in m_freem (mb=0x0) at mbuf.h:447
#7 0xc46849f8 in ?? ()
#8 0xc456b700 in ?? ()
#9 0x00000000 in ?? ()
#10 0xe2981c54 in ?? ()
#11 0xc4033000 in ?? ()
#12 0x460f1757 in ?? ()
#13 0xe2981c54 in ?? ()
#14 0xc4684c1f in ?? ()
#15 0xc4033000 in ?? ()
#16 0xc51ca410 in ?? ()
#17 0xffffffff in ?? ()
#18 0xc4691848 in ?? ()
#19 0x00000016 in ?? ()
#20 0xe2981c70 in ?? ()
#21 0xc466aabf in ?? ()
#22 0xc4691ce4 in ?? ()
#23 0x00000000 in ?? ()
#24 0xc468ee5c in ?? ()
#25 0x000003e5 in ?? ()
#26 0x00000000 in ?? ()
#27 0xe2981cb0 in ?? ()
#28 0xc0798a66 in softclock (dummy=0xc4033000) at /mnt/cvs/FreeBSD/usr/src/sys/kern/kern_timeout.c:273
Previous frame inner to this frame (corrupt stack?)
(kgdb) up 3
#3 0xc093aaab in uma_dbg_free (zone=0xc1462b40, slab=0xc456bfa8, item=0xc456b700)
at /mnt/cvs/FreeBSD/usr/src/sys/vm/uma_dbg.c:302
/mnt/cvs/FreeBSD/usr/src/sys/vm/uma_dbg.c:302:7275:beg:0xc093aaab
(kgdb) l
297 slabref->us_freelist[freei].us_item = 0;
298 } else {
299 if (slab->us_freelist[freei].us_item != 255) {
300 printf("Slab at %p, freei %d = %d.\n",
301 slab, freei, slab->us_freelist[freei].us_item);
302 panic("Duplicate free of item %p from zone %p(%s)\n",
303 item, zone, zone->uz_name);
304 }
305
306 /*
(kgdb) p *zone
$1 = {uz_name = 0xc0a88782 "mbuf_packet", uz_lock = 0xc1474e88, uz_keg = 0xc1474e80, uz_link = {
le_next = 0x0, le_prev = 0xc146278c}, uz_full_bucket = {lh_first = 0x0}, uz_free_bucket = {
lh_first = 0x0}, uz_ctor = 0xc077b090 <mb_ctor_pack>, uz_dtor = 0xc077acf0 <mb_dtor_pack>,
uz_init = 0xc077afc0 <mb_zinit_pack>, uz_fini = 0xc077b030 <mb_zfini_pack>, uz_allocs = 1151793,
uz_frees = 1151409, uz_fails = 0, uz_fills = 0, uz_count = 128, uz_cpu = {{
uc_freebucket = 0xc5071c48, uc_allocbucket = 0xc145a624, uc_allocs = 281595, uc_frees = 281587}}}
(kgdb) p slab
$2 = 0xc456bfa8
(kgdb) p slab[4h*[4l
$3 = {us_head = {us_keg = 0xc1474e80, us_type = {_us_link = {le_next = 0xc4606fa8,
le_prev = 0xc1474eb0}, _us_size = 3294654376}, us_hlink = {sle_next = 0x0},
us_data = 0xc456b000 "", us_flags = 2 '\002', us_freecount = 1 '\001', us_firstfree = 8 '\b'},
us_freelist = {{us_item = 255 'ÿ'}}}
(kgdb) p *slab freei
$4 = 7
(kgdb) p freei *slab slab-> p item
$5 = (void *) 0xc456b700
(kgdb) p item[4h*[4l
Attempt to dereference a generic pointer.
(kgdb) exit quit
baron# exit
exit
Script done on Sun Apr 1 12:40:45 2007
-------------- next part --------------
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# GENERIC -- Generic kernel configuration file for FreeBSD/i386
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ident BARON
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