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netbsd boot error: panic: pmap_get_physpage: out of memory


syzbot found the following issue on:

HEAD commit:    5b0ba9719b32 change the ARC reclaim code to use the pageda..
git tree:       netbsd
console output:
kernel config:
dashboard link:
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63

IMPORTANT: if you fix the issue, please add the following tag to the commit:

[   1.0000000] panic: pmap_get_physpage: out of memory
[   1.0000000] cpu0: Begin traceback...
[   1.0000000] vpanic() at netbsd:vpanic+0xc9d
[   1.0000000] panic() at netbsd:panic+0x1b3 sys/kern/subr_prf.c:210
[   1.0000000] pmap_get_physpage() at netbsd:pmap_get_physpage+0x5a6 sys/arch/x86/x86/pmap.c:5452
[   1.0000000] kmsan_md_shadow_map_page() at netbsd:kmsan_md_shadow_map_page+0x209 sys/arch/amd64/compile/obj/GENERIC_SYZKALLER/./machine/msan.h:156
[   1.0000000] kmsan_shadow_map() at netbsd:kmsan_shadow_map+0xa8 sys/kern/subr_msan.c:488
[   1.0000000] pmap_growkernel() at netbsd:pmap_growkernel+0x59a sys/arch/x86/x86/pmap.c:5612
[   1.0000000] uvm_km_bootstrap() at netbsd:uvm_km_bootstrap+0x8c6 sys/uvm/uvm_km.c:346
[   1.0000000] uvm_init() at netbsd:uvm_init+0x162 sys/uvm/uvm_init.c:131
[   1.0000000] main() at netbsd:main+0x37c sys/kern/init_main.c:317
[   1.0000000] cpu0: End traceback...
[   1.0000000] fatal breakpoint trap in supervisor mode
[   1.0000000] trap type 1 code 0 rip 0xffffffff802228ad cs 0x8 rflags 0x286 cr2 0 ilevel 0x8 rsp 0xffffffff86c69910
[   1.0000000] curlwp 0xffffffff86868f00 pid 0.0 lowest kstack 0xffffffff86c622c0
Stopped in pid 0.0 (system) at  netbsd:breakpoint+0x5:  leave
breakpoint() at netbsd:breakpoint+0x5
vpanic() at netbsd:vpanic+0xc9d
panic() at netbsd:panic+0x1b3 sys/kern/subr_prf.c:210
pmap_get_physpage() at netbsd:pmap_get_physpage+0x5a6 sys/arch/x86/x86/pmap.c:5452
kmsan_md_shadow_map_page() at netbsd:kmsan_md_shadow_map_page+0x209 sys/arch/amd64/compile/obj/GENERIC_SYZKALLER/./machine/msan.h:156
kmsan_shadow_map() at netbsd:kmsan_shadow_map+0xa8 sys/kern/subr_msan.c:488
pmap_growkernel() at netbsd:pmap_growkernel+0x59a sys/arch/x86/x86/pmap.c:5612
uvm_km_bootstrap() at netbsd:uvm_km_bootstrap+0x8c6 sys/uvm/uvm_km.c:346
uvm_init() at netbsd:uvm_init+0x162 sys/uvm/uvm_init.c:131
main() at netbsd:main+0x37c sys/kern/init_main.c:317
ds          d918
es          4da3
fs          9900
gs          0
rdi         5
rsi         0
rbp         ffffffff86c69910
rbx         0
rdx         1
rcx         1910
rax         ffffffff8688d918    msan_lwp0+0x1918
r8          ffffffff8688d918    msan_lwp0+0x1918

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