[Bug 235846] panic: pmap_demote_pde: firstpte and newpte map different physical addresses

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235846

            Bug ID: 235846
           Summary: panic: pmap_demote_pde: firstpte and newpte map
                    different physical addresses
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: panic, stress2
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pho at FreeBSD.org

With FreeBSD 13.0-CURRENT #0 r344247: Mon Feb 18 07:56:47 CET 2019 I got:

20190218 18:41:14 all (127/614): callout_reset_on.sh
panic: pmap_demote_pde: firstpte and newpte map different physical addresses
cpuid = 9
time = 1550511727
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0182bcb460
vpanic() at vpanic+0x1b4/frame 0xfffffe0182bcb4c0
panic() at panic+0x43/frame 0xfffffe0182bcb520
pmap_demote_pde_locked() at pmap_demote_pde_locked+0xd4a/frame
0xfffffe0182bcb5d0
pmap_remove() at pmap_remove+0x457/frame 0xfffffe0182bcb640
vm_map_delete() at vm_map_delete+0x321/frame 0xfffffe0182bcb6b0
vm_map_remove() at vm_map_remove+0x81/frame 0xfffffe0182bcb6e0
pipeclose() at pipeclose+0x2e1/frame 0xfffffe0182bcb720
pipe_close() at pipe_close+0x60/frame 0xfffffe0182bcb750
_fdrop() at _fdrop+0x1a/frame 0xfffffe0182bcb770
closef() at closef+0x1ec/frame 0xfffffe0182bcb800
fdescfree_fds() at fdescfree_fds+0x8c/frame 0xfffffe0182bcb850
fdescfree() at fdescfree+0x39e/frame 0xfffffe0182bcb910
exit1() at exit1+0x4fe/frame 0xfffffe0182bcb980
sys_sys_exit() at sys_sys_exit+0xd/frame 0xfffffe0182bcb990
amd64_syscall() at amd64_syscall+0x291/frame 0xfffffe0182bcbab0

https://people.freebsd.org/~pho/stress/log/mark080.txt

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