uvm_fault(0xffffffff83a43140, 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 *491751 97854 0 0 0x4000000 0 syz-executor kcov_remote_enter(0,ffff80002a7ae410) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838e3f70,ffff80002a746868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a746868,0) 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,ffffffff82e83370,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff800001646800,3,ffff8000314c34e0) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8064b4b880,84946467,ffff800001646800,3,fffffd8007ffd6e8,ffff8000314c34e0) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806cce5d28,84946467,ffff800001646800,ffff8000314c34e0) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000314c34e0,ffff8000338cd8f0,ffff8000338cd840) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff8000338cd8f0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000338cd8f0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf64eea482c0, 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(0xffffffff83a43140, 0xffff800029ef6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7ae410) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838e3f70,ffff80002a746868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a746868,0) 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,ffffffff82e83370,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff800001646800,3,ffff8000314c34e0) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8064b4b880,84946467,ffff800001646800,3,fffffd8007ffd6e8,ffff8000314c34e0) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806cce5d28,84946467,ffff800001646800,ffff8000314c34e0) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000314c34e0,ffff8000338cd8f0,ffff8000338cd840) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff8000338cd8f0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000338cd8f0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf64eea482c0, count: -14 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff8000338cd260 rbx 0xffff80002a7ae410 rdx 0xffff8000314c34e0 rcx 0xffff800029ef6000 rax 0xfffffd806cd10e10 r8 0x494 r9 0 r10 0x84552e41aa53386a r11 0xcb7d6fd34d9c8e6b r12 0xffffffff81561010 endtsleep r13 0xffff80002a7467d0 r14 0xffff80002a7ae410 r15 0 rip 0xffffffff8293de72 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff8000338cd240 ss 0x10 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=491751 pid=97854 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000314c2020,0xffff8000314c3788 process=0xffff80002a7aed10 user=0xffff8000338c8000, vmspace=0xfffffd8078294e68 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 9710 279027 87463 0 2 0 syz-executor 57996 416388 6950 0 2 0 syz-executor 57996 330041 6950 0 3 0x4000080 fsleep syz-executor 97854 65660 48123 0 2 0 syz-executor *97854 491751 48123 0 7 0x4000000 syz-executor 68438 154056 26059 0 2 0 syz-executor 68438 243140 26059 0 3 0x4000080 ttyout syz-executor 18945 448226 72882 0 2 0 syz-executor 18945 192245 72882 0 3 0x4000080 fsleep syz-executor 40633 101640 0 0 3 0x14200 acct acct 31227 188218 73664 0 2 0 syz-executor 31227 19601 73664 0 3 0x4000080 sbwait syz-executor 73292 60470 18798 0 2 0 syz-executor 73292 264893 18798 0 3 0x4000080 fsleep syz-executor 86938 77435 71848 0 2 0 syz-executor 86938 17115 71848 0 3 0x4000080 fsleep syz-executor 86938 447596 71848 0 3 0x4000080 fsleep syz-executor 86938 62584 71848 0 3 0x4000080 fsleep syz-executor 86938 6121 71848 0 3 0x4000080 fsleep syz-executor 90546 238220 1 0 3 0x82 nanoslp getty 71848 167763 33633 0 3 0x82 nanoslp syz-executor 6950 90205 33633 0 3 0x82 nanoslp syz-executor 87463 331926 33633 0 3 0x82 nanoslp syz-executor 73664 477822 33633 0 3 0x82 nanoslp syz-executor 48123 334189 33633 0 3 0x82 nanoslp syz-executor 18798 498153 33633 0 3 0x82 nanoslp syz-executor 26059 231714 33633 0 3 0x82 nanoslp syz-executor 72882 210160 33633 0 3 0x82 nanoslp syz-executor 33633 154928 80103 0 3 0x82 kqread syz-executor 80103 333736 66717 0 3 0x10008a sigsusp ksh 66717 307724 79538 0 3 0x98 kqread sshd-session 79538 102285 74584 0 3 0x92 kqread sshd-session 74584 406054 1 0 3 0x88 kqread sshd 28706 79596 68680 73 3 0x1100090 kqread syslogd 68680 455295 1 0 3 0x100082 sbwait syslogd 56565 219416 1 0 3 0x100080 kqread resolvd 95836 518641 28979 77 3 0x100092 kqread dhcpleased 89428 403053 28979 77 3 0x100092 kqread dhcpleased 28979 360581 1 0 3 0x80 kqread dhcpleased 82504 68656 0 0 3 0x14200 bored smr 48158 432012 0 0 2 0x14200 zerothread 13250 232805 0 0 3 0x14200 aiodoned aiodoned 33338 358454 0 0 3 0x14200 syncer update 23046 28288 0 0 3 0x14200 cleaner cleaner 60146 452410 0 0 3 0x14200 reaper reaper 50700 179593 0 0 3 0x14200 pgdaemon pagedaemon 38369 483012 0 0 3 0x14200 bored viomb 71731 495586 0 0 3 0x40014200 acpi0 acpi0 52049 404045 0 0 3 0x14200 bored softnet0 65290 325695 0 0 3 0x14200 bored systqmp 49311 304251 0 0 3 0x14200 bored systq 85292 124787 0 0 3 0x40014200 tmoslp softclock 75458 336487 0 0 3 0x40014200 idle0 1 417740 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11047 12136K 12578K 166960K 13351 0 pcb 17 12K 12K 166960K 148 0 rtable 160 13K 15K 166960K 576 0 pf 31 13K 20K 166960K 215 0 ifaddr 31 5K 8K 166960K 104 0 ifgroup 42 1K 2K 166960K 162 0 sysctl 3 1K 9K 166960K 8 0 counters 31 17K 18K 166960K 86 0 ioctlops 1 2K 4K 166960K 132 0 iov 0 0K 12K 166960K 13 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1289 81K 82K 166960K 1945 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 13 0 VM map 2 1K 1K 166960K 2 0 sem 11 312K 312K 166960K 18 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 85K 166960K 1175 0 sigio 0 0K 0K 166960K 12 0 proc 60 59K 100K 166960K 653 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 48 0 in_multi 61 4K 7K 166960K 198 0 ether_multi 1 0K 0K 166960K 25 0 mrt 0 0K 0K 166960K 44 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 449 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 220 150K 176K 166960K 11510 0 UVM aobj 17 3K 3K 166960K 17 0 pinsyscall 39 78K 90K 166960K 2420 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 55 0 NDP 9 0K 2K 166960K 63 0 temp 42 9063K 9129K 166960K 8600 0 kqueue 14 22K 28K 166960K 193 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 55 0 52 1 0 1 1 0 8 0 rtentry 136 167 0 107 4 0 4 4 0 8 0 unpcb 144 276 0 259 1 0 1 1 0 8 0 syncache 336 12 0 12 1 0 1 1 0 8 1 tcpqe 32 5 0 5 1 0 1 1 0 8 1 tcpcb 736 126 0 118 1 0 1 1 0 8 0 arp 96 24 0 12 1 0 1 1 0 8 0 ipq 40 2 0 2 1 0 1 1 0 8 1 ipqe 40 4 0 4 1 0 1 1 0 8 1 inpcb 328 437 0 425 2 0 2 2 0 8 0 nd6 112 33 0 20 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1072 35 0 35 1 0 1 1 0 8 1 pppxif 1416 14 0 14 1 0 1 1 0 8 1 pfstscr 40 6 0 6 1 0 1 1 0 8 1 pfrktable 1344 27 0 27 1 0 1 1 0 8 1 pfsrclim 320 1 0 1 1 0 1 1 0 8 1 pfanchor 1288 13 0 11 1 0 1 1 0 8 0 pftag 88 4 0 4 1 0 1 1 0 8 1 pfqueue 320 1 0 1 1 0 1 1 0 8 1 pfstitem 24 6 0 0 1 0 1 1 0 8 0 pfstkey 128 22 0 17 1 0 1 1 0 8 0 pfstate 384 11 0 8 1 0 1 1 0 8 0 pfrule 1360 21 0 21 1 0 1 1 0 8 1 rttmr 136 6 0 6 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 735 0 457 30 3 27 30 0 8 8 art_table 40 737 0 457 5 0 5 5 0 8 0 art_node 32 167 0 114 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semapl 112 13 0 4 1 0 1 1 0 8 0 shmpl 112 14 0 0 1 0 1 1 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 3142 0 1683 92 0 92 92 0 8 0 ffsino 256 3142 0 1683 92 0 92 92 0 8 0 nchpl 144 4472 0 2772 64 0 64 64 0 8 0 rtmask 32 4 0 4 1 0 1 1 0 8 1 vnodes 216 3553 0 0 198 0 198 198 0 8 0 namei 1024 13305 0 13305 1 0 1 1 0 8 1 pfiaddrpl 120 6 0 6 1 0 1 1 0 8 1 kstatmem 264 86 0 68 2 0 2 2 0 8 0 scsiplug 72 4 0 4 1 0 1 1 0 8 1 scxspl 216 18254 0 18254 8 0 8 8 1 8 8 plimitpl 152 223 0 207 1 0 1 1 0 8 0 sigapl 424 1489 0 1445 6 0 6 6 0 8 0 knotepl 120 36445 0 36397 10 0 10 10 0 8 7 kqueuepl 184 209 0 199 1 0 1 1 0 8 0 pipepl 304 143 0 116 3 0 3 3 0 8 0 fdescpl 448 1472 0 1442 4 0 4 4 0 8 0 filepl 120 5268 0 5056 8 0 8 8 0 8 1 lockfpl 104 294 0 290 1 0 1 1 0 8 0 lockfspl 48 141 0 137 1 0 1 1 0 8 0 sessionpl 144 56 0 49 1 0 1 1 0 8 0 pgrppl 48 66 0 51 1 0 1 1 0 8 0 ucredpl 104 1401 0 1389 1 0 1 1 0 8 0 zombiepl 144 1445 0 1445 1 0 1 1 0 8 1 processpl 1152 1489 0 1445 4 0 4 4 0 8 0 procpl 664 2639 0 2585 6 0 6 6 0 8 0 sockpl 552 774 0 742 4 0 4 4 0 8 1 mcl64k 65536 510 0 510 1 0 1 1 0 8 1 mcl16k 16384 315 0 315 1 0 1 1 0 8 1 mcl12k 12288 150 0 150 1 0 1 1 0 8 1 mcl9k 9216 49 0 49 1 0 1 1 0 8 1 mcl8k 8192 134 0 134 1 0 1 1 0 8 1 mcl4k 4096 4591 0 4538 13 0 13 13 0 8 5 mcl2k2 2112 2 0 2 1 0 1 1 0 8 1 mcl2k 2048 500 0 498 1 0 1 1 0 8 0 mtagpl 96 43 0 29 1 0 1 1 0 8 0 mbufpl 256 17527 0 17389 17 0 17 17 0 8 4 bufpl 280 6419 0 205 444 0 444 444 0 8 0 anonpl 24 198571 0 195425 44 0 44 44 0 187 14 amapchunkpl 152 37414 0 36949 32 0 32 32 0 158 11 amappl16 200 3316 0 3282 15 4 11 15 0 8 8 amappl15 192 6 0 6 1 0 1 1 0 8 1 amappl14 184 435 0 434 1 0 1 1 0 8 0 amappl13 176 168 0 158 1 0 1 1 0 8 0 amappl12 168 1731 0 1703 2 0 2 2 0 8 0 amappl11 160 108 0 108 1 0 1 1 0 8 1 amappl10 152 60 0 50 1 0 1 1 0 8 0 amappl9 144 253 0 253 1 0 1 1 0 8 1 amappl8 136 119 0 118 1 0 1 1 0 8 0 amappl7 128 170 0 159 1 0 1 1 0 8 0 amappl6 120 170 0 169 1 0 1 1 0 8 0 amappl5 112 116 0 109 1 0 1 1 0 8 0 amappl4 104 310 0 295 1 0 1 1 0 8 0 amappl3 96 7943 0 7836 3 0 3 3 0 8 0 amappl2 88 666 0 612 2 0 2 2 0 8 0 amappl1 80 18104 0 17549 17 0 17 17 0 8 2 amappl 88 10629 0 10471 4 0 4 4 0 92 0 uvmvnodes 80 118 0 0 3 0 3 3 0 8 0 dma4096 4096 4 0 4 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 0 1 1 0 8 1 dma128 128 255 0 255 1 0 1 1 0 8 1 dma64 64 6 0 6 1 0 1 1 0 8 1 dma32 32 8 0 8 1 0 1 1 0 8 1 dma16 16 23 0 22 1 0 1 1 0 8 0 aobjpl 72 16 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1472 0 1442 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1472 0 1442 1 0 1 1 0 8 0 vmmpekpl 168 13099 0 13061 2 0 2 2 0 8 0 vmmpepl 168 102110 0 100281 98 0 98 98 0 357 8 vmsppl 368 1471 0 1442 4 0 4 4 0 8 1 rwobjpl 40 28593 0 27611 14 0 14 14 0 8 1 pdppl 4096 2950 0 2884 104 32 72 76 0 8 6 pvpl 32 704283 0 694952 133 0 133 133 0 265 33 pmappl 216 1471 0 1442 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 372 0 35 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a7ae410) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838e3f70,ffff80002a746868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a746868,0) 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,ffffffff82e83370,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff800001646800,3,ffff8000314c34e0) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8064b4b880,84946467,ffff800001646800,3,fffffd8007ffd6e8,ffff8000314c34e0) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806cce5d28,84946467,ffff800001646800,ffff8000314c34e0) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000314c34e0,ffff8000338cd8f0,ffff8000338cd840) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff8000338cd8f0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000338cd8f0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf64eea482c0, count: -14 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a7ae410) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838e3f70,ffff80002a746868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a746868,0) 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,ffffffff82e83370,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff800001646800,3,ffff8000314c34e0) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8064b4b880,84946467,ffff800001646800,3,fffffd8007ffd6e8,ffff8000314c34e0) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806cce5d28,84946467,ffff800001646800,ffff8000314c34e0) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000314c34e0,ffff8000338cd8f0,ffff8000338cd840) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff8000338cd8f0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000338cd8f0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf64eea482c0, count: -14