[Bug 267151] [memguard] [panic] page 0xfffffe0037728000 is not freed

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267151

            Bug ID: 267151
           Summary: [memguard] [panic] page 0xfffffe0037728000 is not
                    freed
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: pho@FreeBSD.org

Full reproducer:

root@mercat1:~ # sysctl vm.memguard.options=7
vm.memguard.options: 1 -> 7
root@mercat1:~ # panic: page 0xfffffe0037728000 is not freed
cpuid = 7
time = 1666010877
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe10b9d95ba0
vpanic() at vpanic+0x151/frame 0xfffffe10b9d95bf0
panic() at panic+0x43/frame 0xfffffe10b9d95c50
vm_page_alloc_check() at vm_page_alloc_check+0xa4/frame 0xfffffe10b9d95c60
vm_page_alloc_noobj_domain() at vm_page_alloc_noobj_domain+0x267/frame
0xfffffe10b9d95cc0
vm_page_alloc_noobj() at vm_page_alloc_noobj+0x3b/frame 0xfffffe10b9d95d10
allocbuf() at allocbuf+0x668/frame 0xfffffe10b9d95d80
geteblk() at geteblk+0x7d/frame 0xfffffe10b9d95db0
ffs_bufwrite() at ffs_bufwrite+0x159/frame 0xfffffe10b9d95de0
vn_fsync_buf() at vn_fsync_buf+0x240/frame 0xfffffe10b9d95e40
VOP_FSYNC_APV() at VOP_FSYNC_APV+0x3c/frame 0xfffffe10b9d95e60
sched_sync() at sched_sync+0x426/frame 0xfffffe10b9d95ef0
fork_exit() at fork_exit+0x80/frame 0xfffffe10bfork_trampoline() at
fork_trampoline+0xe/frame 0xfffffe10b9d95f30
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 19 tid 100208 ]
Stopped at      kdb_enter+0x32: movq    $0,0x129c193(%rip)
db> x/s version
version:        FreeBSD 14.0-CURRENT #0 main-n258621-204a5f5800a0d: Mon Oct 17
14:43:34 CEST 2022\012   
pho@mercat1.netperf.freebsd.org:/usr/src/sys/amd64/compile/PHO-MEMGUARD\012
db>

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