login: uvm_fault(0xffffffff82a5e918, 0x0, 0, 2) -> e kernel: page fault trap, code=0 Stopped at km_free+0x118: movq $0,0(%rax) TID PID UID PRFLAGS PFLAGS CPU COMMAND *173071 6913 0 0x14000 0x200 0 systqmp km_free(0,1000,ffffffff827df828,ffffffff827df840) at km_free+0x118 sys/uvm/uvm_km.c:867 pool_p_free(ffffffff82ac4ad8,fffffd8059feaf90) at pool_p_free+0x14b sys/kern/subr_pool.c:1014 pool_gc_pages(0) at pool_gc_pages+0x215 sys/kern/subr_pool.c:1585 taskq_thread(ffffffff8290e940) at taskq_thread+0x9b sys/kern/kern_task.c:449 end trace frame: 0x0, count: 11 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(0xffffffff82a5e918, 0x0, 0, 2) -> e ddb> trace km_free(0,1000,ffffffff827df828,ffffffff827df840) at km_free+0x118 sys/uvm/uvm_km.c:867 pool_p_free(ffffffff82ac4ad8,fffffd8059feaf90) at pool_p_free+0x14b sys/kern/subr_pool.c:1014 pool_gc_pages(0) at pool_gc_pages+0x215 sys/kern/subr_pool.c:1585 taskq_thread(ffffffff8290e940) at taskq_thread+0x9b sys/kern/kern_task.c:449 end trace frame: 0x0, count: -4 ddb> show registers rdi 0x1000 __ALIGN_SIZE rsi 0x28000000 rbp 0xffff80002168ff50 rbx 0x28000000000 rdx 0 rcx 0xffffffff827df840 kp_dirty rax 0 r8 0 r9 0x1 r10 0x4981421bb66c916d r11 0xe4f039c8a59b0b89 r12 0 r13 0xffffffff827df828 kv_page r14 0x1000 __ALIGN_SIZE r15 0x1000 __ALIGN_SIZE rip 0xffffffff81b2fba8 km_free+0x118 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002168fed0 ss 0x10 km_free+0x118: movq $0,0(%rax) ddb> show proc PROC (systqmp) pid=173071 stat=onproc flags process=14000 proc=200 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffff500,0xffff8000ffffefd0 process=0xffff8000ffffcbb8 user=0xffff80002168b000, vmspace=0xffffffff82a5e918 estcpu=0, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 86324 135588 1 0 3 0x100083 ttyin getty 79329 79577 41701 0 3 0x82 piperd syz-executor.4 94402 32441 41701 0 3 0x82 piperd syz-executor.5 76730 36607 41701 0 3 0x82 piperd syz-executor.6 81439 370005 41701 0 3 0x82 piperd syz-executor.1 23023 227822 0 0 3 0x14200 acct acct 71296 80023 41701 0 3 0x82 piperd syz-executor.0 97713 129813 41701 0 3 0x82 nanoslp syz-executor.3 6786 433313 41701 0 3 0x82 piperd syz-executor.2 29408 71127 41701 0 3 0x82 piperd syz-executor.7 66555 293456 0 0 3 0x14200 bored sosplice 41701 429502 94218 0 3 0x82 thrsleep syz-fuzzer 41701 352316 94218 0 3 0x4000082 thrsleep syz-fuzzer 41701 329772 94218 0 3 0x4000082 kqread syz-fuzzer 41701 42453 94218 0 3 0x4000082 thrsleep syz-fuzzer 41701 144328 94218 0 3 0x4000082 thrsleep syz-fuzzer 41701 510827 94218 0 3 0x4000082 thrsleep syz-fuzzer 41701 94586 94218 0 3 0x4000082 thrsleep syz-fuzzer 41701 381414 94218 0 3 0x4000082 thrsleep syz-fuzzer 94218 179091 80729 0 3 0x10008a sigsusp ksh 80729 117005 2797 0 3 0x9a kqread sshd 2797 339392 1 0 3 0x88 kqread sshd 57602 457502 91393 73 3 0x1100090 kqread syslogd 91393 105491 1 0 3 0x100082 netio syslogd 26880 213783 1 0 3 0x100080 kqread resolvd 6328 185520 68693 77 3 0x100092 kqread dhcpleased 50729 224693 68693 77 3 0x100092 kqread dhcpleased 68693 131404 1 0 3 0x80 kqread dhcpleased 36334 305231 0 0 3 0x14200 bored smr 39877 132782 0 0 3 0x14200 pgzero zerothread 52302 429758 0 0 3 0x14200 aiodoned aiodoned 65032 413128 0 0 3 0x14200 syncer update 67874 250601 0 0 3 0x14200 cleaner cleaner 14312 298842 0 0 3 0x14200 reaper reaper 20965 57398 0 0 3 0x14200 pgdaemon pagedaemon 16998 322326 0 0 3 0x14200 bored viomb 17628 79279 0 0 3 0x40014200 acpi0 acpi0 70059 337244 0 0 3 0x14200 bored softnet 33358 208291 0 0 3 0x14200 bored softnet 67866 124233 0 0 3 0x14200 bored softnet 83956 250190 0 0 3 0x14200 bored softnet * 6913 173071 0 0 7 0x14200 systqmp 94134 43661 0 0 3 0x14200 bored systq 34101 60760 0 0 3 0x40014200 bored softclock 14794 383953 0 0 3 0x40014200 idle0 1 502041 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 10207 6426K 7181K 78643K 23392 0 pcb 13 14K 16K 78643K 1589 0 rtable 168 14K 19K 78643K 2340 0 ifaddr 75 17K 19K 78643K 851 0 sysctl 2 0K 2K 78643K 5 0 counters 26 17K 17K 78643K 136 0 ioctlops 0 0K 8K 78643K 1968 0 iov 0 0K 32K 78643K 1109 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1413 88K 88K 78643K 7034 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 98 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 577 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 11 37K 81K 78643K 8660 0 sigio 0 0K 0K 78643K 239 0 proc 58 59K 75K 78643K 1991 0 subproc 104 6K 7K 78643K 611 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 676 0 in_multi 68 4K 6K 78643K 761 0 ether_multi 1 0K 0K 78643K 22 0 mrt 1 0K 0K 78643K 49 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 217 970K 970K 78643K 217 0 exec 0 0K 2K 78643K 2859 0 pfkey data 0 0K 0K 78643K 36 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 7 26K 26K 78643K 7 0 UVM amap 424 1099K 1100K 78643K 50068 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 203 0 NDP 11 0K 2K 78643K 234 0 temp 159 4772K 6782K 78643K 201539 0 kqueue 12 18K 26K 78643K 717 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 120 711 0 708 11 10 1 5 0 8 0 rtentry 112 682 0 613 4 0 4 4 0 8 0 unpcb 144 20052 0 20039 257 254 3 11 0 8 2 syncache 296 62 0 62 16 16 0 1 0 8 0 tcpqe 32 51 0 51 4 4 0 1 0 8 0 tcpcb 736 3173 0 3169 194 189 5 14 0 8 4 arp 88 102 0 92 1 0 1 1 0 8 0 ipq 40 2 0 2 2 2 0 1 0 8 0 ipqe 40 7 0 7 2 2 0 1 0 8 0 inpcb 320 6937 0 6930 236 232 4 12 0 8 3 ip6q 72 9 0 9 3 3 0 1 0 8 0 ip6af 40 16 0 16 3 3 0 1 0 8 0 nd6 48 175 0 157 1 0 1 1 0 8 0 pkpcb 40 20 0 20 5 5 0 1 0 8 0 kcovpl 48 47 0 39 1 0 1 1 0 8 0 ppxss 1160 35 0 35 11 11 0 1 0 8 0 pfrktable 1344 75 0 73 3 2 1 1 0 8 0 pftag 88 12 0 6 1 0 1 1 0 8 0 pfrule 1360 108 0 104 5 4 1 2 0 8 0 rttmr 136 15 0 15 5 5 0 1 0 8 0 art_heap8 4096 2 0 1 2 1 1 2 0 8 0 art_heap4 256 3001 0 2642 56 29 27 29 0 8 0 art_table 32 3003 0 2643 4 0 4 4 0 8 0 art_node 16 667 0 607 1 0 1 1 0 8 0 sysvmsgpl 40 104 0 95 3 2 1 1 0 8 0 semapl 112 575 0 565 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 13983 0 12538 92 1 91 91 0 8 0 ffsino 240 13983 0 12538 86 0 86 86 0 8 0 nchpl 144 25680 0 24042 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 100109 0 100109 25 24 1 2 0 8 1 vcpupl 2048 72 0 1 9 0 9 9 0 8 0 vmpool 536 164 0 93 6 1 5 5 0 8 0 pfiaddrpl 120 33 0 29 3 2 1 1 0 8 0 kstatmem 264 242 0 220 2 0 2 2 0 8 0 scsiplug 72 30 0 30 7 7 0 1 0 8 0 scxspl 216 84034 0 84034 33 32 1 8 0 8 1 plimitpl 152 1692 0 1678 1 0 1 1 0 8 0 sigapl 424 8893 0 8853 8 2 6 8 0 8 0 futexpl 64 83526 0 83526 27 26 1 1 0 8 1 knotepl 120 138137 0 138055 75 69 6 11 0 8 0 kqueuepl 184 1869 0 1861 29 28 1 4 0 8 0 pipepl 288 1510 0 1482 29 26 3 7 0 8 0 fdescpl 432 8853 0 8831 4 0 4 4 0 8 0 filepl 120 74967 0 74730 252 239 13 17 0 8 4 lockfpl 104 2405 0 2403 6 5 1 2 0 8 0 lockfspl 48 642 0 640 1 0 1 1 0 8 0 sessionpl 144 65 0 49 1 0 1 1 0 8 0 pgrppl 48 112 0 96 1 0 1 1 0 8 0 ucredpl 104 14162 0 14150 1 0 1 1 0 8 0 zombiepl 144 8854 0 8853 2 1 1 1 0 8 0 processpl 1000 8893 0 8853 13 6 7 9 0 8 0 procpl 672 23910 0 23863 26 18 8 9 0 8 0 sosppl 168 84 0 84 22 22 0 1 0 8 0 sockpl 456 27724 0 27701 1046 1038 8 42 0 8 5 mcl64k 65536 294 0 294 64 63 1 1 0 8 1 mcl16k 16384 66 0 66 29 29 0 1 0 8 0 mcl12k 12288 257 0 257 55 54 1 1 0 8 1 mcl9k 9216 101 0 101 39 39 0 1 0 8 0 mcl8k 8192 570 0 570 72 71 1 1 0 8 1 mcl4k 4096 979 0 979 54 53 1 3 0 8 1 mcl2k2 2112 55 0 55 38 38 0 1 0 8 0 mcl2k 2048 87768 0 87694 34 24 10 19 0 8 0 mtagpl 96 1611 0 1492 24 21 3 19 0 8 0 mbufpl 256 196835 0 196532 509 487 22 418 0 8 0 bufpl 288 20354 0 13953 458 0 458 458 0 8 0 anonpl 24 1812491 0 1790959 377 237 140 156 0 188 0 amapchunkpl 152 159726 0 158947 148 113 35 43 0 158 2 amappl16 200 26039 0 25296 177 135 42 53 0 8 0 amappl15 192 2445 0 2440 1 0 1 1 0 8 0 amappl14 184 1655 0 1650 1 0 1 1 0 8 0 amappl13 176 962 0 958 1 0 1 1 0 8 0 amappl12 168 976 0 973 1 0 1 1 0 8 0 amappl11 160 703 0 685 1 0 1 1 0 8 0 amappl10 152 1170 0 1166 1 0 1 1 0 8 0 amappl9 144 1300 0 1296 1 0 1 1 0 8 0 amappl8 136 2825 0 2740 6 2 4 4 0 8 0 amappl7 128 1767 0 1755 1 0 1 1 0 8 0 amappl6 120 1251 0 1232 2 1 1 2 0 8 0 amappl5 112 7335 0 7324 1 0 1 1 0 8 0 amappl4 104 4075 0 4046 2 1 1 2 0 8 0 amappl3 96 26126 0 26084 2 0 2 2 0 8 0 amappl2 88 10520 0 10455 3 1 2 3 0 8 0 amappl1 80 211154 0 210613 22 7 15 19 0 8 0 amappl 88 48613 0 48420 8 2 6 6 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 9017 0 8924 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 9017 0 8924 1 0 1 1 0 8 0 vmmpekpl 168 67098 0 67030 4 0 4 4 0 8 0 vmmpepl 168 874316 0 871940 404 270 134 144 0 357 0 vmsppl 272 9016 0 8924 13 6 7 7 0 8 0 rwobjpl 24 218264 0 210464 54 4 50 50 0 8 0 pdppl 4096 18040 0 17919 1213 1078 135 135 0 8 14 pvpl 32 3831808 0 3811782 676 489 187 255 0 265 0 pmappl 216 9016 0 8924 7 1 6 6 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 2950 0 2087 36 10 26 29 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace km_free(0,1000,ffffffff827df828,ffffffff827df840) at km_free+0x118 sys/uvm/uvm_km.c:867 pool_p_free(ffffffff82ac4ad8,fffffd8059feaf90) at pool_p_free+0x14b sys/kern/subr_pool.c:1014 pool_gc_pages(0) at pool_gc_pages+0x215 sys/kern/subr_pool.c:1585 taskq_thread(ffffffff8290e940) at taskq_thread+0x9b sys/kern/kern_task.c:449 end trace frame: 0x0, count: -4 ddb> machine ddbcpu 1 No such command ddb> trace km_free(0,1000,ffffffff827df828,ffffffff827df840) at km_free+0x118 sys/uvm/uvm_km.c:867 pool_p_free(ffffffff82ac4ad8,fffffd8059feaf90) at pool_p_free+0x14b sys/kern/subr_pool.c:1014 pool_gc_pages(0) at pool_gc_pages+0x215 sys/kern/subr_pool.c:1585 taskq_thread(ffffffff8290e940) at taskq_thread+0x9b sys/kern/kern_task.c:449 end trace frame: 0x0, count: -4