panic: kmmaplk: lock not shared
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
* 24588  13188      0           0  0x4000000    0  syz-executor.2
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff825b9701) at panic+0x161 sys/kern/subr_prf.c:202
rw_exit_read(ffffffff82a80478) at rw_exit_read+0x154 sys/kern/kern_rwlock.c:398
uvm_map_fill_vmmap(ffffffff82a80470,ffff800000d82000,ffff80002165eb88) at uvm_map_fill_vmmap+0xf6 vm_map_upgrade_ln sys/uvm/uvm_map.c:5540 [inline]
uvm_map_fill_vmmap(ffffffff82a80470,ffff800000d82000,ffff80002165eb88) at uvm_map_fill_vmmap+0xf6 sys/uvm/uvm_map.c:5593
sysctl_proc_vmmap(ffff80002165ef68,1,200006c0,ffff80002165ef98,ffff8000216647e8) at sysctl_proc_vmmap+0x229 sys/kern/kern_sysctl.c:2111
kern_sysctl(ffff80002165ef64,2,200006c0,ffff80002165ef98,0,fffffffffffffe97,eae0c4a413db4e41) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449
sys_sysctl(ffff8000216647e8,ffff80002165f008,ffff80002165f060) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249
syscall(ffff80002165f0d0) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x19e92260350, 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.