uvm_fault(0xffffffff83ae17b8, 0xffff800025e920c0, 0, 2) -> d
kernel: page fault trap, code=2
Stopped at      memset+0x52:    repe stosq      %es:(%rdi)
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 311432  60900      0         0x2          0    0  syz-executor
memset() at memset+0x52
ffs_write(ffff800033797610) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401
VOP_WRITE(fffffd8066d31b38,ffff8000337976a8,23,fffffd80097fd3a8) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_rdwr(1,fffffd8066d31b38,ffff8000337977e0,40,0,1,d02c2f7be314af1c,0,1018,40) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:330
acct_process(ffff8000373a9cb0) at acct_process+0x7a2 sys/kern/kern_acct.c:245
exit1(ffff8000373a9cb0,b,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228
sys_exit(ffff8000373a9cb0,ffff800033797a20,ffff800033797970) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff800033797a20) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800033797a20) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x76b2fa1e94a0, count: 6
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{1}> 
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: uvm_fault(0xffffffff83ae17b8, 0xffff800025e920c0, 0, 2) -> d
ddb{1}> trace
memset() at memset+0x52
ffs_write(ffff800033797610) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401
VOP_WRITE(fffffd8066d31b38,ffff8000337976a8,23,fffffd80097fd3a8) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_rdwr(1,fffffd8066d31b38,ffff8000337977e0,40,0,1,d02c2f7be314af1c,0,1018,40) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:330
acct_process(ffff8000373a9cb0) at acct_process+0x7a2 sys/kern/kern_acct.c:245
exit1(ffff8000373a9cb0,b,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228
sys_exit(ffff8000373a9cb0,ffff800033797a20,ffff800033797970) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff800033797a20) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800033797a20) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x76b2fa1e94a0, count: -9
ddb{1}> show registers
rdi               0xffff800025e920c0
rsi                                0
rbp               0xffff800033797530
rbx                             0xc0
rdx                                0
rcx                             0xe8
rax                                0
r8                             0x740
r9                0xffff800033797490
r10               0xf121f0df99bf8864
r11               0xffff800025e920c0
r12                             0xc0
r13                            0x800
r14               0xfffffd8066d31b38
r15                              0x1
rip               0xffffffff826ad812    memset+0x52
cs                               0x8
rflags                       0x10206    __ALIGN_SIZE+0xf206
rsp               0xffff800033797328
ss                              0x10
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