uvm_fault(0xffffffff829bde68, 0xffff800021273000, 0, 2) -> e kernel: page fault trap, code=0 Stopped at kcov_remote_enter+0x112: movq $0,0(%rcx) TID PID UID PRFLAGS PFLAGS CPU COMMAND *409120 66134 0 0 0 0 syz-executor.4 kcov_remote_enter(0,ffff8000217347f0) at kcov_remote_enter+0x112 sys/dev/kcov.c:672 timeout_run(ffff800021703b00) at timeout_run+0x80 sys/kern/kern_timeout.c:639 softclock_process_tick_timeout(ffff800021703b00,0) at softclock_process_tick_timeout+0x1ac sys/kern/kern_timeout.c:688 softclock(0) at softclock+0x130 sys/kern/kern_timeout.c:711 softintr_dispatch(0) at softintr_dispatch+0xd1 sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f end of kernel end trace frame: 0x7f7ffffd4500, count: 9 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(0xffffffff829bde68, 0xffff800021273000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff8000217347f0) at kcov_remote_enter+0x112 sys/dev/kcov.c:672 timeout_run(ffff800021703b00) at timeout_run+0x80 sys/kern/kern_timeout.c:639 softclock_process_tick_timeout(ffff800021703b00,0) at softclock_process_tick_timeout+0x1ac sys/kern/kern_timeout.c:688 softclock(0) at softclock+0x130 sys/kern/kern_timeout.c:711 softintr_dispatch(0) at softintr_dispatch+0xd1 sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f end of kernel end trace frame: 0x7f7ffffd4500, count: -6 ddb> show registers rdi 0x4 rsi 0xffff800000685d00 rbp 0xffff800021784f50 rbx 0 rdx 0xffff80002176ca90 rcx 0xffff800021273000 rax 0xfffffd807035eea0 r8 0 r9 0 r10 0x8a1cabea21770517 r11 0x5ad3c4af4ac15324 r12 0xffff800021703a40 r13 0xffffffff82937ff0 cpu_info_full_primary+0x1ff0 r14 0xffff8000217347f0 r15 0 rip 0xffffffff81de0642 kcov_remote_enter+0x112 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff800021784f30 ss 0 kcov_remote_enter+0x112: movq $0,0(%rcx) ddb> show proc PROC (syz-executor.4) pid=409120 stat=onproc flags process=0 proc=0 pri=83, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021702540,0xffff80002176cfe0 process=0xffff800029a713b0 user=0xffff800021780000, vmspace=0xfffffd8071102008 estcpu=36, cpticks=2, pctcpu=0.0 user=1, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 28906 179364 71879 0 3 0x80 nanoslp syz-executor.7 28906 76619 71879 0 3 0x4000080 fsleep syz-executor.7 *66134 409120 11167 0 7 0 syz-executor.4 66134 234614 11167 0 2 0x4000000 syz-executor.4 7283 36079 30992 0 2 0 syz-executor.5 7283 67287 30992 0 3 0x4000080 fsleep syz-executor.5 80774 59262 72811 0 2 0 syz-executor.3 80774 462563 72811 0 3 0x4000080 fsleep syz-executor.3 72811 308637 10386 0 3 0x82 nanoslp syz-executor.3 17723 426795 0 0 3 0x14200 acct acct 93525 370949 10386 0 2 0x2 syz-executor.6 30992 28932 10386 0 3 0x82 nanoslp syz-executor.5 16503 477546 10386 0 3 0x82 piperd syz-executor.0 12547 27656 0 0 3 0x14200 bored sosplice 25073 472188 0 0 3 0x14280 nfsidl nfsio 61068 427882 0 0 3 0x14280 nfsidl nfsio 94819 105401 0 0 3 0x14280 nfsidl nfsio 70691 163970 0 0 3 0x14280 nfsidl nfsio 69523 325480 0 0 3 0x14280 nfsidl nfsio 56840 294040 0 0 3 0x14280 nfsidl nfsio 10123 334622 0 0 3 0x14280 nfsidl nfsio 33363 412238 0 0 3 0x14280 nfsidl nfsio 75880 281561 0 0 3 0x14280 nfsidl nfsio 98328 444411 0 0 3 0x14280 nfsidl nfsio 43044 231772 0 0 3 0x14280 nfsidl nfsio 77897 353836 0 0 3 0x14280 nfsidl nfsio 19813 410633 0 0 3 0x14280 nfsidl nfsio 17042 307074 0 0 3 0x14280 nfsidl nfsio 65454 375392 0 0 3 0x14280 nfsidl nfsio 53229 450254 0 0 3 0x14280 nfsidl nfsio 59671 335952 0 0 3 0x14280 nfsidl nfsio 90439 126308 0 0 3 0x14280 nfsidl nfsio 24382 133348 0 0 3 0x14280 nfsidl nfsio 2646 441692 0 0 3 0x14280 nfsidl nfsio 71879 67751 10386 0 3 0x82 nanoslp syz-executor.7 11167 39493 10386 0 3 0x82 nanoslp syz-executor.4 50570 32440 10386 0 2 0x2 syz-executor.2 82008 242714 10386 0 3 0x82 piperd syz-executor.1 10386 196013 71745 0 3 0x82 wait syz-fuzzer 10386 489622 71745 0 3 0x4000082 nanoslp syz-fuzzer 10386 115581 71745 0 3 0x4000082 wait syz-fuzzer 10386 340112 71745 0 3 0x4000082 thrsleep syz-fuzzer 10386 302137 71745 0 3 0x4000082 wait syz-fuzzer 10386 321090 71745 0 3 0x4000082 thrsleep syz-fuzzer 10386 45505 71745 0 3 0x4000082 thrsleep syz-fuzzer 10386 337899 71745 0 3 0x4000082 thrsleep syz-fuzzer 10386 401689 71745 0 3 0x4000082 wait syz-fuzzer 10386 201432 71745 0 3 0x4000082 wait syz-fuzzer 10386 413621 71745 0 3 0x4000082 wait syz-fuzzer 10386 327345 71745 0 3 0x4000082 wait syz-fuzzer 10386 150737 71745 0 3 0x4000082 wait syz-fuzzer 10386 370472 71745 0 3 0x4000082 kqread syz-fuzzer 71745 12932 3709 0 3 0x10008a sigsusp ksh 3709 39197 42987 0 3 0x9a kqread sshd 46969 47670 1 0 3 0x100083 ttyin getty 42987 139503 1 0 3 0x88 kqread sshd 59185 313347 28749 73 2 0x1100090 syslogd 28749 374232 1 0 3 0x100082 netio syslogd 26044 512353 1 0 3 0x100080 kqread resolvd 30936 63118 37031 77 3 0x100092 kqread dhcpleased 14514 29593 37031 77 3 0x100092 kqread dhcpleased 37031 192721 1 0 3 0x80 kqread dhcpleased 67182 229356 0 0 3 0x14200 bored smr 82176 478593 0 0 2 0x14200 zerothread 76675 181699 0 0 3 0x14200 aiodoned aiodoned 48661 190832 0 0 3 0x14200 syncer update 57838 195232 0 0 3 0x14200 cleaner cleaner 86374 202012 0 0 3 0x14200 reaper reaper 82626 53932 0 0 3 0x14200 pgdaemon pagedaemon 14727 72612 0 0 3 0x14200 bored viomb 77582 376253 0 0 3 0x40014200 acpi0 acpi0 86342 332842 0 0 3 0x14200 bored softnet 80932 70621 0 0 3 0x14200 bored softnet 20822 445750 0 0 3 0x14200 bored softnet 22125 268950 0 0 3 0x14200 bored softnet 47330 431063 0 0 3 0x14200 bored systqmp 81706 288172 0 0 3 0x14200 bored systq 20869 23451 0 0 3 0x40014200 bored softclock 99227 120214 0 0 3 0x40014200 idle0 1 173430 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10181 6418K 6814K 78643K 12734 0 pcb 13 15K 20K 78643K 637 0 rtable 196 14K 16K 78643K 836 0 ifaddr 67 15K 17K 78643K 190 0 counters 27 17K 17K 78643K 56 0 ioctlops 0 0K 4K 78643K 185 0 iov 0 0K 16K 78643K 148 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1404 88K 88K 78643K 3799 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 8 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 700 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 14 49K 69K 78643K 1987 0 sigio 0 0K 0K 78643K 3 0 proc 58 59K 83K 78643K 918 0 subproc 104 6K 6K 78643K 208 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 175 0 in_multi 78 5K 6K 78643K 213 0 ether_multi 1 0K 0K 78643K 4 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 49 228K 228K 78643K 49 0 exec 0 0K 1K 78643K 578 0 pfkey data 0 0K 0K 78643K 3 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 292 325K 326K 78643K 13668 0 UVM aobj 98 3K 3K 78643K 101 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 30 0 NDP 11 0K 1K 78643K 66 0 temp 124 4694K 5718K 78643K 22024 0 kqueue 12 18K 22K 78643K 137 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 131 0 128 2 1 1 2 0 8 0 rtentry 112 215 0 130 4 0 4 4 0 8 0 unpcb 144 3158 0 3145 15 11 4 6 0 8 3 syncache 296 13 0 13 4 3 1 1 0 8 1 tcpqe 32 110 0 110 3 2 1 1 0 8 1 tcpcb 776 1981 0 1975 45 37 8 14 0 8 7 arp 88 34 0 18 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 3 0 3 1 1 0 1 0 8 0 inpcb 336 3394 0 3385 53 43 10 21 0 8 8 nd6 48 49 0 31 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 1 0 1 0 8 0 kcovpl 48 16 0 8 1 0 1 1 0 8 0 ppxss 1160 9 0 9 2 2 0 1 0 8 0 pppxif 1352 6 0 6 1 1 0 1 0 8 0 pfosfp 40 67 0 66 1 0 1 1 0 8 0 pfosfpen 112 67 0 66 1 0 1 1 0 8 0 pfanchor 1280 826 0 649 20 0 20 20 0 8 3 art_heap8 4096 3 0 2 2 1 1 2 0 8 0 art_heap4 256 931 0 569 34 11 23 30 0 8 0 art_table 32 934 0 571 4 0 4 4 0 8 0 art_node 16 214 0 140 1 0 1 1 0 8 0 sysvmsgpl 40 62 0 42 1 0 1 1 0 8 0 semupl 112 6 0 6 1 1 0 1 0 8 0 semapl 112 698 0 688 1 0 1 1 0 8 0 shmpl 112 98 0 3 4 1 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 4120 0 2682 91 0 91 91 0 8 0 ffsino 240 4120 0 2682 85 0 85 85 0 8 0 nchpl 144 8038 0 6407 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 29279 0 29279 2 1 1 2 0 8 1 vcpupl 2048 18 0 0 3 0 3 3 0 8 0 vmpool 536 18 0 0 2 0 2 2 0 8 0 kstatmem 264 68 0 46 2 0 2 2 0 8 0 scxspl 216 19088 0 19088 9 8 1 8 0 8 1 plimitpl 152 204 0 188 1 0 1 1 0 8 0 sigapl 424 2285 0 2222 8 0 8 8 0 8 0 futexpl 64 28407 0 28404 1 0 1 1 0 8 0 knotepl 120 28001 0 27921 15 10 5 8 0 8 2 kqueuepl 184 439 0 431 6 5 1 4 0 8 0 pipepl 288 364 0 336 5 2 3 5 0 8 0 fdescpl 432 2247 0 2222 4 0 4 4 0 8 0 filepl 120 19668 0 19429 27 15 12 15 0 8 4 lockfpl 104 295 0 293 2 1 1 2 0 8 0 lockfspl 48 145 0 143 1 0 1 1 0 8 0 sessionpl 144 31 0 15 1 0 1 1 0 8 0 pgrppl 48 31 0 15 1 0 1 1 0 8 0 ucredpl 104 2138 0 2127 1 0 1 1 0 8 0 zombiepl 144 2222 0 2222 1 0 1 1 0 8 1 processpl 1008 2285 0 2222 10 1 9 9 0 8 0 procpl 672 5028 0 4948 12 3 9 9 0 8 0 sosppl 168 14 0 14 4 4 0 1 0 8 0 sockpl 456 6686 0 6661 146 134 12 34 0 8 8 mcl64k 65536 49 0 49 5 4 1 1 0 8 1 mcl16k 16384 246 0 246 1 0 1 1 0 8 1 mcl12k 12288 38 0 38 5 4 1 1 0 8 1 mcl9k 9216 15 0 15 3 3 0 1 0 8 0 mcl8k 8192 83 0 83 4 3 1 1 0 8 1 mcl4k 4096 210 0 210 1 0 1 1 0 8 1 mcl2k2 2112 7 0 7 4 3 1 1 0 8 1 mcl2k 2048 76105 0 76036 36 26 10 32 0 8 0 mtagpl 96 146 0 123 4 2 2 3 0 8 0 mbufpl 256 142957 0 142684 196 163 33 69 0 8 8 bufpl 288 6554 0 281 449 0 449 449 0 8 0 anonpl 24 443120 0 426829 111 4 107 107 0 188 3 amapchunkpl 152 38287 0 37616 34 4 30 30 0 158 2 amappl16 200 5005 0 4470 34 2 32 32 0 8 3 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 175 0 163 2 1 1 2 0 8 0 amappl13 176 3 0 2 1 0 1 1 0 8 0 amappl12 168 492 0 490 1 0 1 1 0 8 0 amappl11 160 48 0 37 1 0 1 1 0 8 0 amappl10 152 36 0 28 1 0 1 1 0 8 0 amappl9 144 946 0 945 1 0 1 1 0 8 0 amappl8 136 164 0 106 2 0 2 2 0 8 0 amappl7 128 52 0 38 1 0 1 1 0 8 0 amappl6 120 340 0 325 2 1 1 2 0 8 0 amappl5 112 101 0 93 1 0 1 1 0 8 0 amappl4 104 788 0 763 2 1 1 2 0 8 0 amappl3 96 5727 0 5678 2 0 2 2 0 8 0 amappl2 88 2765 0 2699 3 1 2 3 0 8 0 amappl1 80 51862 0 51201 21 5 16 21 0 8 0 amappl 88 13288 0 13115 5 0 5 5 0 92 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 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 100 0 3 2 0 2 2 0 8 0 uaddrrnd 24 2265 0 2222 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2265 0 2222 1 0 1 1 0 8 0 vmmpekpl 168 19598 0 19542 3 0 3 3 0 8 0 vmmpepl 168 210264 0 207839 157 32 125 141 0 357 6 vmsppl 272 2264 0 2222 5 1 4 4 0 8 0 rwobjpl 24 61251 0 53636 47 0 47 47 0 8 0 pdppl 4096 4536 0 4462 208 126 82 82 0 8 8 pvpl 32 939392 0 918039 263 75 188 255 0 265 4 pmappl 216 2264 0 2222 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1186 0 383 24 0 24 24 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff8000217347f0) at kcov_remote_enter+0x112 sys/dev/kcov.c:672 timeout_run(ffff800021703b00) at timeout_run+0x80 sys/kern/kern_timeout.c:639 softclock_process_tick_timeout(ffff800021703b00,0) at softclock_process_tick_timeout+0x1ac sys/kern/kern_timeout.c:688 softclock(0) at softclock+0x130 sys/kern/kern_timeout.c:711 softintr_dispatch(0) at softintr_dispatch+0xd1 sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f end of kernel end trace frame: 0x7f7ffffd4500, count: -6 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff8000217347f0) at kcov_remote_enter+0x112 sys/dev/kcov.c:672 timeout_run(ffff800021703b00) at timeout_run+0x80 sys/kern/kern_timeout.c:639 softclock_process_tick_timeout(ffff800021703b00,0) at softclock_process_tick_timeout+0x1ac sys/kern/kern_timeout.c:688 softclock(0) at softclock+0x130 sys/kern/kern_timeout.c:711 softintr_dispatch(0) at softintr_dispatch+0xd1 sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f end of kernel end trace frame: 0x7f7ffffd4500, count: -6