uvm_fault(0xffffffff83ad1680, 0xffff800029ee6000, 0, 2) -> e
kernel: page fault trap, code=2
Stopped at      kcov_remote_enter+0x122:        movq    $0,0(%rcx)
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*274322  12352      0           0          0    0  syz-executor
kcov_remote_enter(0,ffff80002a79e890) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff838d2830,ffff80002a7365d0) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a7365d0,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756
softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788
softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
end of kernel
end trace frame: 0x70ce920b5720, count: 8
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(0xffffffff83ad1680, 0xffff800029ee6000, 0, 2) -> e
ddb> trace
kcov_remote_enter(0,ffff80002a79e890) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff838d2830,ffff80002a7365d0) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a7365d0,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756
softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788
softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
end of kernel
end trace frame: 0x70ce920b5720, count: -7
ddb> show registers
rdi                       0xffffffff
rsi               0xffff800000c16c00
rbp               0xffff80003b4ed0c0
rbx               0xffff80002a79e890
rdx               0xffff80002a7642c0
rcx               0xffff800029ee6000
rax               0xfffffd806cac7c00
r8                                 0
r9                                 0
r10               0xa993f9172d5cf209
r11               0x67e53c35636eb267
r12               0xffffffff81c62b70    endtsleep
r13               0xffff80002a736538
r14               0xffff80002a79e890
r15                                0
rip               0xffffffff8295b502    kcov_remote_enter+0x122
cs                               0x8
rflags                       0x10297    __ALIGN_SIZE+0xf297
rsp               0xffff80003b4ed0a0
ss                                 0
kcov_remote_enter+0x122:        movq    $0,0(%rcx)
ddb> show proc
PROC (syz-executor) tid=274322 pid=12352 tcnt=2 stat=onproc
    flags process=0 proc=0
    runpri=50, usrpri=50, slppri=17, nice=20
    wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
    forw=0xffffffffffffffff, list=0xffff80002a764028,0xffff80002a764fc8
    process=0xffff80002f0adf98 user=0xffff80003b4e8000, vmspace=0xfffffd806cabb8b0
    estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=1
ddb>