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
* 73636  83334      0           0  0x4000000    0  syz-executor
kcov_remote_enter(0,ffff80002a7ad210) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff83871810,ffff80002a746d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a746d98,0) 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
writedisklabel(d02,ffffffff8192ed30,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158
sdioctl(d02,84946467,ffff8000015e1800,3,ffff80002a776d08) at sdioctl+0x959 sys/scsi/sd.c:921
VOP_IOCTL(fffffd807b2e2528,84946467,ffff8000015e1800,3,fffffd8007ffd478,ffff80002a776d08) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd807b36c0f0,84946467,ffff8000015e1800,ffff80002a776d08) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531
sys_ioctl(ffff80002a776d08,ffff80003c8f11c0,ffff80003c8f1110) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80003c8f11c0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c8f11c0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x251b8450c70, count: 1
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,ffff80002a7ad210) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff83871810,ffff80002a746d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a746d98,0) 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
writedisklabel(d02,ffffffff8192ed30,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158
sdioctl(d02,84946467,ffff8000015e1800,3,ffff80002a776d08) at sdioctl+0x959 sys/scsi/sd.c:921
VOP_IOCTL(fffffd807b2e2528,84946467,ffff8000015e1800,3,fffffd8007ffd478,ffff80002a776d08) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd807b36c0f0,84946467,ffff8000015e1800,ffff80002a776d08) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531
sys_ioctl(ffff80002a776d08,ffff80003c8f11c0,ffff80003c8f1110) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80003c8f11c0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c8f11c0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x251b8450c70, count: -14
ddb>