uvm_fault(0xffffffff838b92d0, 0xffff800029f26000, 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 *306285 3633 0 0 0 0 syz-executor kcov_remote_enter(0,ffff80002a7df610) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff837d2fc0,ffff80002a777d28) at timeout_run+0xc2 sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a777d28,0) 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 end of kernel end trace frame: 0x7a66c4220ad0, count: 8 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(0xffffffff838b92d0, 0xffff800029f26000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7df610) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff837d2fc0,ffff80002a777d28) at timeout_run+0xc2 sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a777d28,0) 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 end of kernel end trace frame: 0x7a66c4220ad0, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000b11c00 rbp 0xffff80003c9310e0 rbx 0xffff80002a7df610 rdx 0xffff80003c9e67f8 rcx 0xffff800029f26000 rax 0xfffffd806cb1dba0 r8 0 r9 0 r10 0xb2a6c4b086bb46e r11 0x9f16dba797f00fef r12 0xffffffff8249a7a0 endtsleep r13 0xffff80002a777c90 r14 0xffff80002a7df610 r15 0 rip 0xffffffff82bbab62 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003c9310c0 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=306285 pid=3633 tcnt=3 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c9e7788,0xffff80003c9e7a30 process=0xffff800031904498 user=0xffff80003c92c000, vmspace=0xfffffd807d9b7468 estcpu=36, cpticks=5, pctcpu=0.0, user=4, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 48696 351925 15814 0 2 0 syz-executor 48696 114881 15814 0 3 0x4000080 fsleep syz-executor 48696 208257 15814 0 3 0x4000080 fsleep syz-executor * 3633 306285 87487 0 7 0 syz-executor 3633 142415 87487 0 3 0x4000080 fsleep syz-executor 3633 288117 87487 0 3 0x4000080 fsleep syz-executor 59595 264194 91143 0 2 0 syz-executor 59595 44525 91143 0 2 0x4000000 syz-executor 67116 201560 49599 0 3 0x82 piperd syz-executor 91143 212650 49599 0 3 0x82 nanoslp syz-executor 39999 386213 0 0 3 0x14200 acct acct 19252 161437 11338 0 3 0x82 sbwait sshd-session 87487 41779 49599 0 3 0x82 nanoslp syz-executor 81906 147325 0 0 3 0x14280 nfsidl nfsio 13715 476990 0 0 3 0x14280 nfsidl nfsio 79784 506040 0 0 3 0x14280 nfsidl nfsio 73760 398331 0 0 3 0x14280 nfsidl nfsio 2108 418870 0 0 3 0x14280 nfsidl nfsio 17979 244105 0 0 3 0x14280 nfsidl nfsio 57484 355481 0 0 3 0x14280 nfsidl nfsio 50448 55823 0 0 3 0x14280 nfsidl nfsio 56115 418019 0 0 3 0x14280 nfsidl nfsio 27561 26913 0 0 3 0x14280 nfsidl nfsio 74836 289641 0 0 3 0x14280 nfsidl nfsio 55419 266247 0 0 3 0x14280 nfsidl nfsio 37379 114993 0 0 3 0x14280 nfsidl nfsio 40684 168070 0 0 3 0x14280 nfsidl nfsio 20030 237842 0 0 3 0x14280 nfsidl nfsio 23330 35770 0 0 3 0x14280 nfsidl nfsio 65412 49865 0 0 3 0x14280 nfsidl nfsio 56206 192714 0 0 3 0x14280 nfsidl nfsio 97614 155084 0 0 3 0x14280 nfsidl nfsio 37410 123867 0 0 3 0x14280 nfsidl nfsio 15814 269563 49599 0 3 0x82 nanoslp syz-executor 27056 10157 49599 0 3 0x82 nanoslp syz-executor 59743 177283 49599 0 3 0x82 nanoslp syz-executor 49599 23255 51876 0 3 0x82 wait syz-executor 51876 252344 62395 0 3 0x10008a sigsusp ksh 62395 463965 42702 0 3 0x98 kqread sshd-session 42702 97312 11338 0 3 0x92 kqread sshd-session 13473 37874 1 0 3 0x100083 ttyopn getty 11338 465071 1 0 3 0x88 kqread sshd 71470 204656 32856 73 3 0x1100090 kqread syslogd 32856 278030 1 0 3 0x100082 sbwait syslogd 22965 501484 1 0 3 0x100080 kqread resolvd 18883 451598 91936 77 3 0x100092 kqread dhcpleased 3028 31298 91936 77 3 0x100092 kqread dhcpleased 91936 280164 1 0 3 0x80 kqread dhcpleased 69005 434549 0 0 3 0x14200 bored smr 59191 214921 0 0 2 0x14200 zerothread 77564 157724 0 0 3 0x14200 aiodoned aiodoned 13804 213807 0 0 3 0x14200 syncer update 902 208133 0 0 3 0x14200 cleaner cleaner 86433 396793 0 0 3 0x14200 reaper reaper 99190 331324 0 0 3 0x14200 pgdaemon pagedaemon 81230 491680 0 0 3 0x14200 bored viomb 63088 68817 0 0 3 0x40014200 acpi0 acpi0 99404 503487 0 0 3 0x14200 bored softnet0 67290 69986 0 0 3 0x14200 bored systqmp 23978 169946 0 0 3 0x14200 bored systq 56470 403571 0 0 3 0x40014200 tmoslp softclock 26004 493467 0 0 3 0x40014200 idle0 1 342821 0 0 3 0x80082 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 10199 11042K 11709K 166960K 12775 0 pcb 18 16K 18K 166960K 235 0 rtable 180 9K 9K 166960K 645 0 pf 28 12K 19K 166960K 127 0 ifaddr 29 5K 8K 166960K 104 0 ifgroup 45 2K 2K 166960K 156 0 sysctl 3 1K 9K 166960K 12 0 counters 31 17K 18K 166960K 91 0 ioctlops 0 0K 4K 166960K 158 0 iov 0 0K 24K 166960K 70 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1419 89K 89K 166960K 2282 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 85 0 dirhash 72 12K 14K 166960K 699 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 14 49K 89K 166960K 945 0 sigio 0 0K 0K 166960K 13 0 proc 61 59K 91K 166960K 681 0 subproc 63 3K 4K 166960K 117 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 85 0 in_multi 55 4K 7K 166960K 177 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 499 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 214 151K 177K 166960K 9879 0 UVM aobj 13 8K 10K 166960K 19 0 pinsyscall 37 74K 93K 166960K 2143 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 79 0 NDP 11 0K 2K 166960K 72 0 temp 52 8666K 8732K 166960K 43308 0 kqueue 13 20K 30K 166960K 168 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 120 106 0 103 1 0 1 1 0 8 0 rtentry 136 188 0 128 4 0 4 4 0 8 0 unpcb 144 491 0 474 6 3 3 4 0 8 2 syncache 336 7 0 7 1 1 0 1 0 8 0 tcpcb 736 333 0 326 7 6 1 7 0 8 0 arp 96 31 0 21 1 0 1 1 0 8 0 ipq 40 3 0 0 1 0 1 1 0 8 0 ipqe 40 3 0 0 1 0 1 1 0 8 0 inpcb 328 920 0 909 12 5 7 7 0 8 6 ip6q 72 68 0 66 1 0 1 1 0 8 0 ip6af 40 134 0 132 1 0 1 1 0 8 0 nd6 112 42 0 30 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 kcovpl 48 13 0 6 1 0 1 1 0 8 0 mppekey 1024 3 0 3 2 1 1 1 0 8 1 ppxss 1072 45 0 45 2 1 1 1 0 8 1 pppxif 1384 6 0 6 2 1 1 1 0 8 1 pfstscr 40 1 0 1 1 0 1 1 0 8 1 pfrktable 1344 1 0 1 1 1 0 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pfstkey 128 2 0 2 1 0 1 1 0 8 1 pfstate 384 1 0 1 1 0 1 1 0 8 1 pfrule 1344 6 0 6 2 1 1 1 0 8 1 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 751 0 475 29 6 23 29 0 8 5 art_table 40 755 0 475 5 0 5 5 0 8 0 art_node 32 186 0 132 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 10 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 83 0 73 1 0 1 1 0 8 0 shmpl 112 12 0 5 1 0 1 1 0 8 0 dirhash 1024 249 0 212 6 0 6 6 0 8 1 dino2pl 256 3080 0 1574 95 0 95 95 0 8 0 ffsino 256 3080 0 1574 95 0 95 95 0 8 0 nchpl 144 4351 0 2652 64 0 64 64 0 8 0 rtmask 32 10 0 10 2 1 1 1 0 8 1 vnodes 216 3673 0 0 205 0 205 205 0 8 0 namei 1024 15426 0 15426 2 1 1 1 0 8 1 vcpupl 3904 3 0 0 1 0 1 1 0 8 0 vmpool 800 4 0 1 1 0 1 1 0 8 0 kstatmem 264 90 0 72 2 0 2 2 0 8 0 acpiwqpl 32 3 0 3 1 0 1 1 1 8 1 scsiplug 72 5 0 5 2 1 1 1 0 8 1 scxspl 216 18375 0 18375 8 7 1 8 1 8 1 plimitpl 152 246 0 230 1 0 1 1 0 8 0 sigapl 424 1242 0 1180 8 0 8 8 0 8 0 knotepl 120 31864 0 31816 25 14 11 24 0 8 8 kqueuepl 184 352 0 343 4 3 1 4 0 8 0 pipepl 304 217 0 190 3 0 3 3 0 8 0 fdescpl 448 1207 0 1180 5 1 4 5 0 8 0 filepl 120 7988 0 7783 13 2 11 11 0 8 2 lockfpl 104 428 0 425 2 1 1 2 0 8 0 lockfspl 48 128 0 125 1 0 1 1 0 8 0 sessionpl 144 28 0 19 1 0 1 1 0 8 0 pgrppl 48 52 0 35 1 0 1 1 0 8 0 ucredpl 104 1620 0 1607 1 0 1 1 0 8 0 zombiepl 144 1316 0 1312 1 0 1 1 0 8 0 processpl 1152 1242 0 1180 5 0 5 5 0 8 0 procpl 664 2421 0 2353 8 0 8 8 0 8 0 sosppl 176 7 0 7 1 1 0 1 0 8 0 sockpl 552 1549 0 1518 13 5 8 8 0 8 5 mcl64k 65536 108 0 108 2 1 1 1 0 8 1 mcl16k 16384 11 0 11 1 1 0 1 0 8 0 mcl12k 12288 2 0 2 1 1 0 1 0 8 0 mcl9k 9216 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 10 0 10 2 1 1 1 0 8 1 mcl4k 4096 3462 0 3407 15 7 8 15 0 8 0 mcl2k2 2112 2 0 2 2 1 1 1 0 8 1 mcl2k 2048 1486 0 1481 4 2 2 3 0 8 1 mtagpl 96 28 0 20 1 0 1 1 0 8 0 mbufpl 256 13112 0 12987 20 4 16 17 0 8 4 bufpl 280 7295 0 1074 445 0 445 445 0 8 0 anonpl 24 185275 0 182175 54 19 35 54 0 187 0 amapchunkpl 152 32626 0 32223 38 3 35 35 0 158 13 amappl16 200 3133 0 3109 22 17 5 20 0 8 1 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 7 0 6 1 0 1 1 0 8 0 amappl13 176 463 0 462 1 0 1 1 0 8 0 amappl12 168 1580 0 1543 2 0 2 2 0 8 0 amappl11 160 6 0 5 1 0 1 1 0 8 0 amappl10 152 40 0 30 1 0 1 1 0 8 0 amappl9 144 256 0 256 1 1 0 1 0 8 0 amappl8 136 18 0 17 1 0 1 1 0 8 0 amappl7 128 106 0 105 1 0 1 1 0 8 0 amappl6 120 321 0 308 1 0 1 1 0 8 0 amappl5 112 77 0 68 1 0 1 1 0 8 0 amappl4 104 401 0 376 1 0 1 1 0 8 0 amappl3 96 6416 0 6327 4 0 4 4 0 8 0 amappl2 88 563 0 501 2 0 2 2 0 8 0 amappl1 80 12772 0 12169 14 0 14 14 0 8 0 amappl 88 8989 0 8851 5 0 5 5 0 92 0 uvmvnodes 80 117 0 0 3 0 3 3 0 8 0 dma16384 16384 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 255 0 255 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 18 0 6 1 0 1 1 0 8 0 uaddrrnd 24 1207 0 1180 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1207 0 1180 1 0 1 1 0 8 0 vmmpekpl 168 11177 0 11123 4 1 3 3 0 8 0 vmmpepl 168 81892 0 80132 95 7 88 94 0 357 1 vmsppl 368 1206 0 1180 4 1 3 4 0 8 0 rwobjpl 40 23294 0 22271 14 0 14 14 0 8 0 pdppl 4096 2428 0 2365 111 38 73 78 0 8 10 pvpl 32 528833 0 519896 130 24 106 123 0 265 3 pmappl 216 1210 0 1181 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 409 0 74 11 0 11 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a7df610) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff837d2fc0,ffff80002a777d28) at timeout_run+0xc2 sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a777d28,0) 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 end of kernel end trace frame: 0x7a66c4220ad0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a7df610) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff837d2fc0,ffff80002a777d28) at timeout_run+0xc2 sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a777d28,0) 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 end of kernel end trace frame: 0x7a66c4220ad0, count: -7