[Bug 204426] Processes terminating cannot access memory

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204426

--- Comment #15 from rblayzor at inoc.net ---
After installing a new world and booting to new root NFS. I've seen one crash
(usually takes time). However this one is a bit odd. Kernel message:

Failed to write core file for process exim (error 14)
pid 58267 (exim), uid 26: exited on signal 11


But I do get a core file, but this is all:

GNU gdb 6.1.1 [FreeBSD]
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This GDB was configured as "amd64-marcel-freebsd"...
Core was generated by `exim'.
Program terminated with signal 11, Segmentation fault.
Cannot access memory at address 0x800978ac0
#0  0x00000008023a2990 in ?? ()
(gdb) bt full
#0  0x00000008023a2990 in ?? ()
No symbol table info available.
Cannot access memory at address 0x7fffffff4f70
(gdb) bt info
No symbol "info" in current context.
(gdb) x/i $rip
0x8023a2990:    Cannot access memory at address 0x8023a2990
(gdb) info registers
rax            0xffffffffffffffd0       -48
rbx            0x2010   8208
rcx            0x800788330      34367636272
rdx            0x0      0
rsi            0x3ff3   16371
rdi            0x8030033c1      34410083265
rbp            0x7fffffff5420   0x7fffffff5420
rsp            0x7fffffff4f70   0x7fffffff4f70
r8             0x7fffffff4670   140737488307824
r9             0x80269f6e0      34400237280
r10            0xfffffffffffff000       -4096
r11            0x8030033c0      34410083264
r12            0x7fffffffed40   140737488350528
r13            0x803229000      34412335104
r14            0x2010   8208
r15            0x3000   12288
rip            0x8023a2990      0x8023a2990
eflags         0x10206  66054
cs             0x43     67
ss             0x3b     59
ds             0x0      0
es             0x0      0
fs             0x0      0
gs             0x0      0

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