uvm_fault(0xffffffff839e2868, 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 kcov_remote_enter(0,ffff80002a7acd90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838bc8d0,ffff80002a776340) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a776340,0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:153 km_free(ffff80002f4c2000,400000,ffffffff83623160,ffffffff83623248) at km_free+0x2a3 sys/uvm/uvm_km.c:699 kd_free(ffff8000015d82c0) at kd_free+0x84 sys/dev/kcov.c:564 kcovclose(141300,3,2000,ffff80002a776fa0) at kcovclose+0xe4 sys/dev/kcov.c:-1 spec_close(ffff80002a81cf60) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806d1e0cf0,3,fffffd8007ffd618,ffff80002a776fa0) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ccee5a0,ffff80002a776fa0) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ccee5a0,ffff80002a776fa0) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 end trace frame: 0xffff80002a81d080, 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(0xffffffff839e2868, 0xffff800029ef6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7acd90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838bc8d0,ffff80002a776340) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a776340,0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:153 km_free(ffff80002f4c2000,400000,ffffffff83623160,ffffffff83623248) at km_free+0x2a3 sys/uvm/uvm_km.c:699 kd_free(ffff8000015d82c0) at kd_free+0x84 sys/dev/kcov.c:564 kcovclose(141300,3,2000,ffff80002a776fa0) at kcovclose+0xe4 sys/dev/kcov.c:-1 spec_close(ffff80002a81cf60) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806d1e0cf0,3,fffffd8007ffd618,ffff80002a776fa0) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ccee5a0,ffff80002a776fa0) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ccee5a0,ffff80002a776fa0) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 fdrop(fffffd806ccee5a0,ffff80002a776fa0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd806ccee5a0,ffff80002a776fa0) at closef+0x190 sys/kern/kern_descrip.c:1265 fdfree(ffff80002a776fa0) at fdfree+0x115 sys/kern/kern_descrip.c:1196 exit1(ffff80002a776fa0,1,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a776fa0,ffff80002a81d2c0,ffff80002a81d210) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a81d2c0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a81d2c0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73b7678c2810, count: -21 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80002a81cb20 rbx 0xffff80002a7acd90 rdx 0xffff80002a776fa0 rcx 0xffff800029ef6000 rax 0xfffffd806ccedf00 r8 0 r9 0 r10 0xa6c7e57f21a53d3d r11 0xdd6c7b9c33353128 r12 0xffffffff82063d70 endtsleep r13 0xffff80002a7762a8 r14 0xffff80002a7acd90 r15 0 rip 0xffffffff8176e5c2 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80002a81cb00 ss 0x10 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=409696 pid=59335 tcnt=0 stat=onproc flags process=a proc=2000 runpri=17, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a776d08,0xffff80002a746018 process=0xffff80002a7ac490 user=0xffff80002a818000, vmspace=0xfffffd8072bef738 estcpu=36, cpticks=6, pctcpu=0.1, user=0, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 27709 388199 6882 0 2 0 syz-executor 27709 414874 6882 0 2 0x4000000 syz-executor 51881 181065 19376 0 3 0x80 nanoslp syz-executor 51881 373619 19376 0 3 0x4000080 pppxread syz-executor 51881 3704 19376 0 3 0x4000080 fsleep syz-executor 91615 436195 81983 0 2 0xc80 syz-executor 91615 77576 81983 0 3 0x4000080 fsleep syz-executor 91615 259834 81983 0 3 0x4000080 msgwait syz-executor 91615 24988 81983 0 3 0x4000080 fsleep syz-executor 11820 58290 1 0 3 0x82 nanoslp getty 82718 292998 0 0 3 0x14280 nfsidl nfsio 41832 96293 0 0 3 0x14280 nfsidl nfsio 74397 431897 0 0 3 0x14280 nfsidl nfsio 21886 483405 0 0 3 0x14280 nfsidl nfsio 35202 201611 0 0 3 0x14280 nfsidl nfsio 5240 334453 0 0 3 0x14280 nfsidl nfsio 20803 377789 0 0 3 0x14280 nfsidl nfsio 57366 416729 0 0 3 0x14280 nfsidl nfsio 25093 360365 0 0 3 0x14280 nfsidl nfsio 43915 313558 0 0 3 0x14280 nfsidl nfsio 69418 373795 0 0 3 0x14280 nfsidl nfsio 47692 49495 0 0 3 0x14280 nfsidl nfsio 80918 178499 0 0 3 0x14280 nfsidl nfsio 89436 421137 0 0 3 0x14280 nfsidl nfsio 88711 127072 0 0 3 0x14280 nfsidl nfsio 9672 479710 0 0 3 0x14280 nfsidl nfsio 46505 453608 0 0 3 0x14280 nfsidl nfsio 14128 196565 0 0 3 0x14280 nfsidl nfsio 34451 213156 0 0 3 0x14280 nfsidl nfsio 72144 52249 0 0 3 0x14280 nfsidl nfsio 6882 349076 67801 0 2 0xc82 syz-executor 5803 234128 67801 0 3 0x82 nanoslp syz-executor 16213 191688 67801 0 2 0xc82 syz-executor 81983 282632 67801 0 2 0xc82 syz-executor 7239 197859 67801 0 3 0x82 nanoslp syz-executor 16263 346189 67801 0 2 0x2 syz-executor 19376 422777 67801 0 3 0x82 nanoslp syz-executor 67801 359567 1 0 2 0x82 syz-executor 27838 285686 0 0 3 0x14200 bored smr 5024 162480 0 0 2 0x14200 zerothread 47693 297846 0 0 3 0x14200 aiodoned aiodoned 49718 369330 0 0 3 0x14200 syncer update 11943 176842 0 0 3 0x14200 cleaner cleaner 5115 511406 0 0 3 0x14200 reaper reaper 42969 366726 0 0 3 0x14200 pgdaemon pagedaemon 95200 303626 0 0 3 0x14200 bored viomb 27207 93867 0 0 3 0x40014200 acpi0 acpi0 74001 327041 0 0 2 0x14200 softnet0 28085 409294 0 0 3 0x14200 bored systqmp 49082 523299 0 0 3 0x14200 bored systq 79183 117330 0 0 3 0x40014200 tmoslp softclock 91748 418610 0 0 3 0x40014200 idle0 1 71434 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb>