uvm_fault(0xffffffff83a8c610, 0xffff800029d8442c, 0, 2) -> d
kernel: page fauuvm_fault(0xffffffff83a8c610, 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
*151325  66757      0         0x2        0x1    0  syz-executor
kcov_remote_enter(0,ffff80002a79d690) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff8391d0f0,ffff80002a736d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a736d98,0) 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
cnputc(75) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(75) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff83477584) at db_printf+0x9b sys/kern/subr_prf.c:-1
db_ktrap(6,2,ffff80003c907780) at db_ktrap+0x1b4 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline]
db_ktrap(6,2,ffff80003c907780) at db_ktrap+0x1b4 sys/arch/amd64/amd64/db_interface.c:128
kerntrap(ffff80003c907780) at kerntrap+0x230 sys/arch/amd64/amd64/trap.c:519
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
end trace frame: 0xffff80003c907a40, 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(0xffffffff83a8c610, 0xffff800029ee6000, 0, 2) -> e
ddb> trace
kcov_remote_enter(0,ffff80002a79d690) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff8391d0f0,ffff80002a736d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a736d98,0) 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
cnputc(75) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(75) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff83477584) at db_printf+0x9b sys/kern/subr_prf.c:-1
db_ktrap(6,2,ffff80003c907780) at db_ktrap+0x1b4 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline]
db_ktrap(6,2,ffff80003c907780) at db_ktrap+0x1b4 sys/arch/amd64/amd64/db_interface.c:128
kerntrap(ffff80003c907780) at kerntrap+0x230 sys/arch/amd64/amd64/trap.c:519
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
memset() at memset+0x49
ffs_write(ffff80003c907b20) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401
VOP_WRITE(fffff80065ca6da0,ffff80003c907bd0,3,fffff80007ffd958) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff8000314bfca8,fffff80065ca6da0,fffff80007ffd958,ffff80003c907ca0,ffff80003c907c80) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:692
ktrsysret(ffff8000314bfca8,5b,0,ffff80003c907d60) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline]
ktrsysret(ffff8000314bfca8,5b,0,ffff80003c907d60) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209
syscall(ffff80003c907e10) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline]
syscall(ffff80003c907e10) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x765cdba77c70, count: -21
ddb>