uvm_fault(0xffffffff83accc50, 0xffff80001aa52000, 0, 2) -> d
kernel: page fault trap, code=2
Stopped at      memset+0x52:    repe stosq      %es:(%rdi)
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*174770  68289      0      0x1004          0    0  syz-executor
memset() at memset+0x52
ffs_write(ffff8000380d0880) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd80787437d0,ffff8000380d0910,0,fffffd8007ffd410) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
uvn_io(fffffd806f41e8c8,ffff8000380d0a90,1,39,1) at uvn_io+0x485 sys/uvm/uvm_vnode.c:1232
uvm_pager_put(fffffd806f41e8c8,fffffd80072c6180,ffff8000380d0b30,ffff8000380d0b54,39,0,378a4862dafa20b2) at uvm_pager_put+0x10a sys/uvm/uvm_pager.c:505
uvn_flush(fffffd806f41e8c8,0,0,19) at uvn_flush+0x68d sys/uvm/uvm_vnode.c:705
uvn_detach(fffffd806f41e8c8) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344
uvm_unmap_detach(ffff8000380d0c78,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1370
uvmspace_exec(ffff80002f8b1770,1000,7f7fffffc000) at uvmspace_exec+0x451 sys/uvm/uvm_map.c:3404
sys_execve(ffff80002f8b1770,ffff8000380d1300,ffff8000380d1250) at sys_execve+0xc31 sys/kern/kern_exec.c:453
syscall(ffff8000380d1300) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff8000380d1300) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7abe1e07c9a0, count: 3
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports.  Insufficient info makes it difficult to find and fix bugs.
ddb> 
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xffffffff83accc50, 0xffff80001aa52000, 0, 2) -> d
ddb>