panic: Memory modified after free

Steve Kargl sgk at
Tue Jan 31 13:22:12 PST 2006

The system is a dual proc Tyan K8S Pro with 12 GB of memory.
The kernel is UP.  This was recorded by hand. I have the crash dump.

Memory modified after free 0xffffff02505e0c00(504) val=deadc0dd @

panic: Most recently used by DEVFS1
KDB: stack backtrace
kdb_backtrace() at kdb_backtrace+0x37
panic() at panic+0x164
mtrash_ctor() at mtrash_ctor+0x70
uma_zalloc_arg() at uma_zalloc_arg+0x170
malloc() at malloc+0xf5
fdinit() at fdinit+0x20
fdcopy() at fdcopy+0x21
fork1() at fork1+0x624
vfork() at vork+0x1f
syscall() at syscall+0x350
Xfast_syscall() at Xfast_syscall+0xa8

--- syscall(66, FreeBSD ELF64, vfork), rip = 0x2006aa6d, rsp=0x7ffffffdac0,
rbp = 0 ---

troutmask:root[259] gdb /boot/kernel/kernel vmcore.0
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This GDB was configured as "amd64-marcel-freebsd"...

warning: "/usr/tmp/vmcore.0": no core file handler recognizes format, using defa
Can't fetch registers from this type of core file
Can't fetch registers from this type of core file
#0  0x0000000000000000 in ?? ()


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