panic: vm_page_free_prep: freeing mapped page

[Larry Rosenman]

I have cores.  Ideas?
svn rev: r349976

[I] ➜ more core.txt.12
borg.lerctr.org dumped core - see /var/crash/vmcore.12

Sat Jul 13 16:47:03 CDT 2019

FreeBSD borg.lerctr.org 13.0-CURRENT FreeBSD 13.0-CURRENT r349976 
LER-MINIMAL  amd64

panic: vm_page_free_prep: freeing mapped page 0xfffff82031044790

GNU gdb (GDB) 8.3 [GDB v8.3 for FreeBSD]
Copyright (C) 2019 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-portbld-freebsd13.0".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
     <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /boot/kernel/kernel...
Reading symbols from /usr/lib/debug//boot/kernel/kernel.debug...

Unread portion of the kernel message buffer:
panic: vm_page_free_prep: freeing mapped page 0xfffff82031044790
cpuid = 21
time = 1563053382
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 
0xfffffe018f9fd890
vpanic() at vpanic+0x19d/frame 0xfffffe018f9fd8e0
panic() at panic+0x43/frame 0xfffffe018f9fd940
vm_page_free_prep() at vm_page_free_prep+0x18a/frame 0xfffffe018f9fd960
vm_page_free_toq() at vm_page_free_toq+0x12/frame 0xfffffe018f9fd990
vm_object_terminate() at vm_object_terminate+0x1db/frame 
0xfffffe018f9fd9e0
vm_object_deallocate() at vm_object_deallocate+0x412/frame 
0xfffffe018f9fda40
vm_map_process_deferred() at vm_map_process_deferred+0x7f/frame 
0xfffffe018f9fda60
kern_munmap() at kern_munmap+0x181/frame 0xfffffe018f9fdad0
amd64_syscall() at amd64_syscall+0x25c/frame 0xfffffe018f9fdbf0
fast_syscall_common() at fast_syscall_common+0x101/frame 
0xfffffe018f9fdbf0
--- syscall (73, FreeBSD ELF64, sys_munmap), rip = 0x80119978a, rsp = 
0x7fffffffce18, rbp = 0x7fffffffce20 ---
Uptime: 2h27m22s
Dumping 15640 out of 131026 
MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%

__curthread () at /usr/src/sys/amd64/include/pcpu.h:246
246             __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" 
(OFFSETOF_CURTHREAD));
(kgdb) #0  __curthread () at /usr/src/sys/amd64/include/pcpu.h:246
#1  doadump (textdump=1) at /usr/src/sys/kern/kern_shutdown.c:392
#2  0xffffffff804b6620 in kern_reboot (howto=260)
     at /usr/src/sys/kern/kern_shutdown.c:479
#3  0xffffffff804b6a99 in vpanic (fmt=<optimized out>, ap=<optimized 
out>)
     at /usr/src/sys/kern/kern_shutdown.c:905
#4  0xffffffff804b67d3 in panic (fmt=<unavailable>)
     at /usr/src/sys/kern/kern_shutdown.c:832
#5  0xffffffff8076c21a in vm_page_free_prep (m=0xfffff82031044790)
     at /usr/src/sys/vm/vm_page.c:3273
#6  0xffffffff80768152 in vm_page_free_toq (m=0xfffff82031044790)
     at /usr/src/sys/vm/vm_page.c:3483
#7  0xffffffff8076321b in vm_object_terminate_pages (object=<optimized 
out>)
     at /usr/src/sys/vm/vm_object.c:726
#8  vm_object_terminate (object=0xfffff81b924c9600)
     at /usr/src/sys/vm/vm_object.c:798
#9  0xffffffff80762582 in vm_object_deallocate 
(object=0xfffff81b924c9600)
     at /usr/src/sys/vm/vm_object.c:663
#10 0xffffffff80756aef in vm_map_entry_deallocate (entry=<optimized 
out>,
     system_map=0) at /usr/src/sys/vm/vm_map.c:3457
#11 vm_map_process_deferred () at /usr/src/sys/vm/vm_map.c:586
#12 0xffffffff807606b1 in kern_munmap (td=0xfffff80c207e0000,
     addr0=<optimized out>, size=149200896) at 
/usr/src/sys/vm/vm_mmap.c:603
#13 0xffffffff807adaac in syscallenter (td=0xfffff80c207e0000)
     at /usr/src/sys/amd64/amd64/../../kern/subr_syscall.c:135
#14 amd64_syscall (td=0xfffff80c207e0000, traced=0)
     at /usr/src/sys/amd64/amd64/trap.c:1181
#15 <signal handler called>
#16 0x000000080119978a in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffffffce18
(kgdb)

-- 
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 214-642-9640                 E-Mail: ler at lerctr.org
US Mail: 5708 Sabbia Dr, Round Rock, TX 78665-2106