[ 253.4173755] panic: kernel diagnostic assertion "uvm_page_locked_p(old_pg)" failed: file "/syzkaller/managers/netbsd-kubsan/kernel/sys/arch/x86/x86/pmap.c", line 4351 
[ 253.4395615] cpu1: Begin traceback...
[ 253.4506616] vpanic() at netbsd:vpanic+0x2aa sys/kern/subr_prf.c:336
[ 253.4950583] kern_assert() at netbsd:kern_assert+0x63
[ 253.5394596] pmap_enter_ma() at netbsd:pmap_enter_ma+0x1f10 sys/arch/x86/x86/pmap.c:4351
[ 253.5727508] pmap_enter_default() at netbsd:pmap_enter_default+0x7a sys/arch/x86/x86/pmap.c:4168
[ 253.6282503] uvm_fault_lower_enter() at netbsd:uvm_fault_lower_enter+0x283 sys/uvm/uvm_fault.c:2253
[ 253.6726441] uvm_fault_internal() at netbsd:uvm_fault_internal+0x29bd uvm_fault_lower_promote sys/uvm/uvm_fault.c:2211 [inline]
[ 253.6726441] uvm_fault_internal() at netbsd:uvm_fault_internal+0x29bd uvm_fault_lower sys/uvm/uvm_fault.c:1759 [inline]
[ 253.6726441] uvm_fault_internal() at netbsd:uvm_fault_internal+0x29bd sys/uvm/uvm_fault.c:915
[ 253.7170361] trap() at netbsd:trap+0x1195 sys/arch/amd64/amd64/trap.c:534
[ 253.7281353] --- trap (number 6) ---
[ 253.7281353] Skipping crash dump on recursive panic
[ 253.7281353] panic: UBSan: Undefined Behavior in /syzkaller/managers/netbsd-kubsan/kernel/sys/arch/amd64/amd64/db_machdep.c:153:24, member access within misaligned address 0x3ddef for type 'struct x86_64_frame' which requires 8 byte alignment

[ 253.7614287] Faulted in mid-traceback; aborting...
[ 253.7614287] fatal breakpoint trap in supervisor mode
[ 253.7725274] trap type 1 code 0 rip 0xffffffff8021ddbd cs 0x8 rflags 0x286 cr2 0x200017c0 ilevel 0 rsp 0xffffdc80b416eba0
[ 253.7836255] curlwp 0xfffffe27faef71e0 pid 6423.1 lowest kstack 0xffffdc80b416c2c0
Stopped in pid 6423.1 (syz-executor.1) at       netbsd:breakpoint+0x5:  leave
?
breakpoint() at netbsd:breakpoint+0x5
db_panic() at netbsd:db_panic+0x109 sys/ddb/db_panic.c:67
vpanic() at netbsd:vpanic+0x2aa sys/kern/subr_prf.c:336
isAlreadyReported() at netbsd:isAlreadyReported
HandleTypeMismatch.part.1() at netbsd:HandleTypeMismatch.part.1+0xcc
HandleTypeMismatch() at netbsd:HandleTypeMismatch+0x7b sys/../common/lib/libc/misc/ubsan.c:408
db_nextframe() at netbsd:db_nextframe+0x6f6 sys/arch/amd64/amd64/db_machdep.c:153
db_stack_trace_print() at netbsd:db_stack_trace_print+0x2c4 sys/arch/x86/x86/db_trace.c:277
db_panic() at netbsd:db_panic+0xa3 x86_curcpu sys/arch/amd64/compile/obj/GENERIC_SYZKALLER/./machine/cpu.h:67 [inline]
db_panic() at netbsd:db_panic+0xa3 sys/ddb/db_panic.c:57
vpanic() at netbsd:vpanic+0x2aa sys/kern/subr_prf.c:336
kern_assert() at netbsd:kern_assert+0x63
pmap_enter_ma() at netbsd:pmap_enter_ma+0x1f10 sys/arch/x86/x86/pmap.c:4351
pmap_enter_default() at netbsd:pmap_enter_default+0x7a sys/arch/x86/x86/pmap.c:4168
uvm_fault_lower_enter() at netbsd:uvm_fault_lower_enter+0x283 sys/uvm/uvm_fault.c:2253
uvm_fault_internal() at netbsd:uvm_fault_internal+0x29bd uvm_fault_lower_promote sys/uvm/uvm_fault.c:2211 [inline]
uvm_fault_internal() at netbsd:uvm_fault_internal+0x29bd uvm_fault_lower sys/uvm/uvm_fault.c:1759 [inline]
uvm_fault_internal() at netbsd:uvm_fault_internal+0x29bd sys/uvm/uvm_fault.c:915
trap() at netbsd:trap+0x1195 sys/arch/amd64/amd64/trap.c:534
--- trap (number 6) ---
[ 253.7836255] Skipping crash dump on recursive panic
[ 253.7836255] panic: UBSan: Undefined Behavior in /syzkaller/managers/netbsd-kubsan/kernel/sys/arch/amd64/amd64/db_machdep.c:154:14, member access within misaligned address 0x3ddef for type 'struct x86_64_frame' which requires 8 byte alignment

[ 253.7836255] Faulted in mid-traceback; aborting...
[ 253.7836255] fatal breakpoint trap in supervisor mode
[ 253.7836255] trap type 1 code 0 rip 0xffffffff8021ddbd cs 0x8 rflags 0x286 cr2 0x200017c0 ilevel 0x8 rsp 0xffffdc80b416d8a0
[ 253.7836255] curlwp 0xfffffe27faef71e0 pid 6423.1 lowest kstack 0xffffdc80b416c2c0
Stopped in pid 6423.1 (syz-executor.1) at       netbsd:breakpoint+0x5:  leave