uvm_fault(0xffffffff83933e98, 0xffff800029ef6000, 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
*122199   6019      0         0x2          0    0  syz-executor
kcov_remote_enter(0,ffff80002a7af190) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff83871810,ffff80002a746338) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a746338,0) 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
ffs_update(fffffd806f4fd300,0) at ffs_update+0x1d2 sys/ufs/ffs/ffs_inode.c:95
ufs_inactive(ffff80002a8599e0) at ufs_inactive+0x2de sys/ufs/ufs/ufs_inode.c:95
VOP_INACTIVE(fffffd806065eeb0,ffff80002a746f98) at VOP_INACTIVE+0xfb sys/kern/vfs_vops.c:498
vput(fffffd806065eeb0) at vput+0xdc sys/kern/vfs_subr.c:789
VOP_REMOVE(fffffd806065e058,fffffd806065eeb0,ffff80002a859b48) at VOP_REMOVE+0x199 sys/kern/vfs_vops.c:336
dounlinkat(ffff80002a746f98,ffffff9c,722f3af6ff20,0) at dounlinkat+0x1c4 sys/kern/vfs_syscalls.c:1923
syscall(ffff80002a859cb0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a859cb0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
end trace frame: 0xffff80002a859d30, count: 0
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(0xffffffff83933e98, 0xffff800029ef6000, 0, 2) -> e
ddb> trace
kcov_remote_enter(0,ffff80002a7af190) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff83871810,ffff80002a746338) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a746338,0) 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
ffs_update(fffffd806f4fd300,0) at ffs_update+0x1d2 sys/ufs/ffs/ffs_inode.c:95
ufs_inactive(ffff80002a8599e0) at ufs_inactive+0x2de sys/ufs/ufs/ufs_inode.c:95
VOP_INACTIVE(fffffd806065eeb0,ffff80002a746f98) at VOP_INACTIVE+0xfb sys/kern/vfs_vops.c:498
vput(fffffd806065eeb0) at vput+0xdc sys/kern/vfs_subr.c:789
VOP_REMOVE(fffffd806065e058,fffffd806065eeb0,ffff80002a859b48) at VOP_REMOVE+0x199 sys/kern/vfs_vops.c:336
dounlinkat(ffff80002a746f98,ffffff9c,722f3af6ff20,0) at dounlinkat+0x1c4 sys/kern/vfs_syscalls.c:1923
syscall(ffff80002a859cb0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a859cb0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x722f3af703d0, count: -15
ddb>