panic: malloc: out of space in kmem_map
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*294113  98934      0         0x2          0    0K syz-executor.1
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x174 sys/kern/subr_prf.c:208
malloc(200000,2a,9) at malloc+0xad5 sys/kern/kern_malloc.c:242
kcovioctl(1b1300,80084b01,ffff800020c178d0,3,ffff800020b8a720) at kcovioctl+0xe6 kd_init sys/dev/kcov.c:405 [inline]
kcovioctl(1b1300,80084b01,ffff800020c178d0,3,ffff800020b8a720) at kcovioctl+0xe6 sys/dev/kcov.c:298
VOP_IOCTL(fffffd8061c08c60,80084b01,ffff800020c178d0,3,fffffd807f7c6a20,ffff800020b8a720) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
vn_ioctl(fffffd8066e31ac8,80084b01,ffff800020c178d0,ffff800020b8a720) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
sys_ioctl(ffff800020b8a720,ffff800020c17a10,ffff800020c17a00) at sys_ioctl+0x651
syscall(ffff800020c17ab0) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800020c17ab0) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,36,7f7ffffd4008,36,3,87fd26b890) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffd3b20, 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.