syzbot

uvm_fault(0xfffffd807ec60000, 0x0, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at      dt_ioctl_record_stop+0x108:     movq    0(%r14),%r14
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
dt_ioctl_record_stop(ffff800001615a00) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593
dtclose(21e5f,81,2000,ffff80003c8fcd28) at dtclose+0xd9 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline]
dtclose(21e5f,81,2000,ffff80003c8fcd28) at dtclose+0xd9 sys/dev/dt/dt_dev.c:239
spec_close(ffff80002a89f3c0) at spec_close+0x466 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd806edac040,81,fffffd8007ffdb60,ffff80003c8fcd28) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156
vn_closefile(fffffd806ff09000,ffff80003c8fcd28) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:298 [inline]
vn_closefile(fffffd806ff09000,ffff80003c8fcd28) at vn_closefile+0x11d sys/kern/vfs_vnops.c:621
fdrop(fffffd806ff09000,ffff80003c8fcd28) at fdrop+0x121 sys/kern/kern_descrip.c:1281
closef(fffffd806ff09000,ffff80003c8fcd28) at closef+0x190 sys/kern/kern_descrip.c:1265
fdfree(ffff80003c8fcd28) at fdfree+0x115 sys/kern/kern_descrip.c:1196
exit1(ffff80003c8fcd28,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff80003c8fcd28,ffff80002a89f720,ffff80002a89f670) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80002a89f720) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a89f720) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7cb941706f40, 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>