kern/83761: vm-related panic: blst_radix_free: freeing free block
Nick Johnson
freebsd at spatula.net
Wed Jul 20 01:50:22 GMT 2005
>Number: 83761
>Category: kern
>Synopsis: vm-related panic: blst_radix_free: freeing free block
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Jul 20 01:50:21 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: Nick Johnson
>Release: FreeBSD 4.11-STABLE i386
>Organization:
morons.org
>Environment:
System: FreeBSD turing.morons.org 4.11-STABLE FreeBSD 4.11-STABLE #3: Sat Dec 18 16:12:51 PST 2004 root at turing.morons.org:/usr/obj/usr/src/sys/TURING i386
>Description:
Not sure what happened here, but the box crashed when I exited a vim session that had been running (stopped) for
a few weeks. I use vm.swap_enabled, so the entire process was likely swapped out and would have swapped in and then
been freed after I exited. From the look of the stack trace, the crash occurred during process exit.
Fortunately I have dumpon in use, although my kernel has no debugging symbols. Here's the pertinent information from gdb -k:
IdlePTD at physical address 0x0033e000
initial pcb at physical address 0x002a7c00
panicstr: blst_radix_free: freeing free block
panic messages:
---
panic: blst_radix_free: freeing free block
(kgdb) bt
#0 0xc015c81e in dumpsys ()
#1 0xc015c5ef in boot ()
#2 0xc015ca2d in panic ()
#3 0xc0169f53 in blst_leaf_free ()
#4 0xc016a04c in blst_meta_free ()
#5 0xc016a06f in blst_meta_free ()
#6 0xc016a06f in blst_meta_free ()
#7 0xc016a06f in blst_meta_free ()
#8 0xc0169cd2 in blist_free ()
#9 0xc020466a in swp_pager_meta_free_all ()
#10 0xc0203232 in swap_pager_dealloc ()
#11 0xc020fc0f in vm_pager_deallocate ()
#12 0xc020b224 in vm_object_terminate ()
#13 0xc020b0c0 in vm_object_deallocate ()
#14 0xc0208390 in vm_map_entry_delete ()
#15 0xc0208549 in vm_map_delete ()
#16 0xc02085d6 in vm_map_remove ()
#17 0xc01542e4 in exit1 ()
#18 0xc01540b8 in exit1 ()
#19 0xc0236199 in syscall2 ()
#20 0xc0229a75 in Xint0x80_syscall ()
Cannot access memory at address 0xbfbfee90.
>How-To-Repeat:
Unknown. This is the first time I've witnessed this on this machine in
3+ years of operation.
>Fix:
Unknown.
>Release-Note:
>Audit-Trail:
>Unformatted:
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