uvm_fault(0xfffffd8069b34928, 0x8, 0, 1) -> e kernel: page fault trap, code=0 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx TID PID UID PRFLAGS PFLAGS CPU COMMAND 114338 88866 0 0x14000 0x200 1 reaper witness_checkorder(fffffd806f0af1c0,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f0af1b0) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000212ebd50,fffffd806f0af1b0,fffffd806f0af238,a,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000212ebd50,a) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000212ebd50) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000212ebd50,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000212ebd50,ffff80002e405e50,ffff80002e405ea0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e405f20) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e405f20) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b12bb573bc0, count: 6 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: uvm_fault(0xfffffd8069b34928, 0x8, 0, 1) -> e ddb{0}> trace witness_checkorder(fffffd806f0af1c0,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f0af1b0) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000212ebd50,fffffd806f0af1b0,fffffd806f0af238,a,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000212ebd50,a) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000212ebd50) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000212ebd50,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000212ebd50,ffff80002e405e50,ffff80002e405ea0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e405f20) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e405f20) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b12bb573bc0, count: -9 ddb{0}> show registers rdi 0 rsi 0x20000 acpi_pdirpa+0xbe63 rbp 0xffff80002e405bf0 rbx 0xe rdx 0 rcx 0xffff8000212ebd50 rax 0xffffffff82bd4ff0 cpu_info_full_primary+0x1ff0 r8 0 r9 0 r10 0 r11 0xafa41614928d36fb r12 0 r13 0xfffffd806f0af1c0 r14 0 r15 0xffff8000212ebd50 rip 0xffffffff8138576c witness_checkorder+0x1ec cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002e405b40 ss 0 witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{0}> show proc PROC (syz-executor.5) pid=46531 stat=onproc flags process=1008 proc=2000 pri=0, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff8000212eb558,0xffff800021225d50 process=0xffff800021290878 user=0xffff80002e400000, vmspace=0xfffffd8069b34928 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 99675 75152 73831 0 2 0 syz-executor.4 99675 446397 73831 0 3 0x4000080 fsleep syz-executor.4 99675 263342 73831 0 2 0x4000000 syz-executor.4 99675 453584 73831 0 3 0x4000080 fsleep syz-executor.4 74532 298326 80271 0 2 0 syz-executor.2 74532 147837 80271 0 2 0x4000000 syz-executor.2 7548 266266 99664 0 2 0 syz-executor.0 7548 92907 99664 0 3 0x4000080 fsleep syz-executor.0 7548 435473 99664 0 3 0x4000080 fsleep syz-executor.0 7548 120202 99664 0 3 0x4000080 fsleep syz-executor.0 22638 146143 70167 0 2 0 syz-executor.7 22638 80932 70167 0 2 0x4000000 syz-executor.7 85863 413571 55341 0 3 0x80 nanoslp syz-executor.1 85863 284888 55341 0 3 0x4000080 fsleep syz-executor.1 85863 10901 55341 0 3 0x4000080 fsleep syz-executor.1 85863 266666 55341 0 3 0x4000080 fsleep syz-executor.1 85863 74019 55341 0 2 0x4000000 syz-executor.1 87296 493718 1 0 3 0x100083 ttyin getty 98804 109358 0 0 3 0x14200 bored sosplice 44147 299759 0 0 3 0x14280 nfsidl nfsio 57086 173636 0 0 3 0x14280 nfsidl nfsio 46192 156681 0 0 3 0x14280 nfsidl nfsio 17655 132695 0 0 3 0x14280 nfsidl nfsio 53971 315764 0 0 3 0x14280 nfsidl nfsio 81636 388822 0 0 3 0x14280 nfsidl nfsio 33962 272913 0 0 3 0x14280 nfsidl nfsio 44822 201325 0 0 3 0x14280 nfsidl nfsio 41638 20696 0 0 3 0x14280 nfsidl nfsio 78311 236951 0 0 3 0x14280 nfsidl nfsio 22813 515458 0 0 3 0x14280 nfsidl nfsio 20494 251518 0 0 3 0x14280 nfsidl nfsio 86031 422167 0 0 3 0x14280 nfsidl nfsio 88858 80882 0 0 3 0x14280 nfsidl nfsio 98329 282847 0 0 3 0x14280 nfsidl nfsio 23775 108203 0 0 3 0x14280 nfsidl nfsio 20752 368610 0 0 3 0x14280 nfsidl nfsio 25680 186478 0 0 3 0x14280 nfsidl nfsio 67058 69775 0 0 3 0x14280 nfsidl nfsio 2659 133621 0 0 3 0x14280 nfsidl nfsio 70167 389004 35984 0 3 0x82 nanoslp syz-executor.7 7863 220924 35984 0 3 0x82 nanoslp syz-executor.6 26242 449369 35984 0 3 0x82 nanoslp syz-executor.5 73831 272187 35984 0 3 0x82 nanoslp syz-executor.4 37144 63516 35984 0 2 0x2 syz-executor.3 55341 243177 35984 0 2 0x2 syz-executor.1 80271 236179 35984 0 3 0x82 nanoslp syz-executor.2 99664 451756 35984 0 3 0x82 nanoslp syz-executor.0 35984 60660 67413 0 3 0x2000082 wait syz-fuzzer 35984 400793 67413 0 3 0x6000082 thrsleep syz-fuzzer 35984 203944 67413 0 3 0x6000082 wait syz-fuzzer 35984 436055 67413 0 3 0x6000082 thrsleep syz-fuzzer 35984 502456 67413 0 3 0x6000082 thrsleep syz-fuzzer 35984 177590 67413 0 3 0x6000082 wait syz-fuzzer 35984 119363 67413 0 3 0x6000082 wait syz-fuzzer 35984 121694 67413 0 3 0x6000082 wait syz-fuzzer 35984 137138 67413 0 3 0x6000082 wait syz-fuzzer 35984 264176 67413 0 3 0x6000082 wait syz-fuzzer 35984 448195 67413 0 3 0x6000082 thrsleep syz-fuzzer 35984 126004 67413 0 3 0x6000082 thrsleep syz-fuzzer 35984 70825 67413 0 3 0x6000082 kqread syz-fuzzer 35984 275615 67413 0 3 0x6000082 wait syz-fuzzer 35984 220955 67413 0 3 0x6000082 thrsleep syz-fuzzer 67413 50991 38272 0 3 0x10008a sigsusp ksh 38272 361943 22299 0 3 0x9a kqread sshd 22299 184941 1 0 3 0x88 kqread sshd 81607 441736 84809 74 3 0x1100092 bpf pflogd 84809 318628 1 0 3 0x80 netio pflogd 21693 303985 12104 73 3 0x1100090 kqread syslogd 12104 48457 1 0 3 0x100082 netio syslogd 36841 493551 1 0 3 0x100080 kqread resolvd 66843 63252 84014 77 3 0x100092 kqread dhcpleased 89974 207494 84014 77 3 0x100092 kqread dhcpleased 84014 174843 1 0 3 0x80 kqread dhcpleased 67314 246664 0 0 3 0x14200 pause smr 22460 418391 0 0 2 0x14200 zerothread 99392 26943 0 0 3 0x14200 aiodoned aiodoned 63327 451826 0 0 3 0x14200 syncer update 11793 485813 0 0 3 0x14200 cleaner cleaner 88866 114338 0 0 7 0x14200 reaper 29760 422107 0 0 3 0x14200 pgdaemon pagedaemon 69789 183864 0 0 3 0x14200 bored viomb 43793 358129 0 0 3 0x40014200 acpi0 acpi0 4815 418598 0 0 3 0x40014200 idle1 63817 453241 0 0 3 0x14200 bored softnet3 38573 340454 0 0 3 0x14200 bored softnet2 40148 495005 0 0 3 0x14200 bored softnet1 5239 347058 0 0 3 0x14200 bored softnet0 40125 455474 0 0 3 0x14200 bored systqmp 51204 341923 0 0 3 0x14200 bored systq 88232 213379 0 0 3 0x40014200 bored softclock 45445 342369 0 0 3 0x40014200 idle0 1 67061 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 1: exclusive sched_lock &sched_lock r = 0 (0xffffffff82d64410) #0 witness_lock+0x447 #1 sched_idle+0x199 sys/kern/kern_sched.c:172 #2 proc_trampoline+0x1c ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10356 6752K 6993K 78643K 12200 0 pcb 13 8K 8K 78643K 16 0 rtable 236 6K 6K 78643K 358 0 pf 35 10K 10K 78643K 59 0 ifaddr 46 15K 15K 78643K 56 0 ifgroup 60 2K 2K 78643K 81 0 counters 62 36K 36K 78643K 74 0 ioctlops 0 0K 4K 78643K 1483 0 iov 0 0K 16K 78643K 27 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1288 81K 81K 78643K 1463 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 7 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 20 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 16 57K 85K 78643K 587 0 proc 70 91K 128K 78643K 569 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 2 0K 0K 78643K 20 0 in_multi 99 7K 7K 78643K 99 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 121 546K 546K 78643K 121 0 exec 0 0K 1K 78643K 424 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 350 85K 85K 78643K 8178 0 UVM aobj 75 3K 3K 78643K 75 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 6 0 NDP 13 0K 0K 78643K 35 0 temp 49 5909K 5989K 78643K 6231 0 kqueue 12 18K 24K 78643K 57 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 82 0 79 2 0 2 2 0 8 1 rtentry 112 112 0 1 4 0 4 4 0 8 0 unpcb 144 813 0 797 10 6 4 10 0 8 3 syncache 304 7 0 7 2 1 1 1 0 8 1 tcpqe 32 116 0 116 3 2 1 1 0 8 1 tcpcb 808 82 0 60 4 1 3 4 0 8 0 arp 120 18 0 0 1 0 1 1 0 8 0 inpcb 368 263 0 239 7 0 7 7 0 8 4 nd6 136 25 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1256 2 0 2 1 1 0 1 0 8 0 pffrag 232 37 0 35 1 0 1 1 0 482 0 pffrnode 88 37 0 35 1 0 1 1 0 8 0 pffrent 40 72 0 70 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 38 0 16 1 0 1 1 0 8 0 pfstkey 128 38 0 16 2 0 2 2 0 8 0 pfstate 376 38 0 16 4 0 4 4 0 8 1 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 454 0 0 29 0 29 29 0 8 0 art_table 32 455 0 0 4 0 4 4 0 8 0 art_node 16 111 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 3 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 13 0 3 1 0 1 1 0 8 0 shmpl 112 72 0 0 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2055 0 606 91 0 91 91 0 8 0 ffsino 272 2055 0 606 97 0 97 97 0 8 0 nchpl 144 2935 0 1244 64 0 64 64 0 8 0 uvmvnodes 80 2302 0 0 47 0 47 47 0 8 0 vnodes 216 2302 0 0 128 0 128 128 0 8 0 namei 1024 10678 0 10678 2 1 1 2 0 8 1 percpumem 16 50 0 6 1 0 1 1 0 8 0 kstatmem 264 38 0 12 2 0 2 2 0 8 0 scxspl 216 10041 0 10041 10 9 1 8 1 8 1 plimitpl 152 114 0 98 1 0 1 1 0 8 0 sigapl 424 932 0 864 9 1 8 8 0 8 0 futexpl 64 3933 0 3925 1 0 1 1 0 8 0 knotepl 120 438 0 0 13 0 13 13 0 8 0 kqueuepl 216 114 0 106 3 2 1 3 0 8 0 pipepl 320 242 0 214 8 5 3 8 0 8 0 fdescpl 496 894 0 865 5 1 4 5 0 8 0 filepl 152 5085 0 4830 19 5 14 19 0 8 3 lockfpl 104 150 0 148 1 0 1 1 0 8 0 lockfspl 48 75 0 73 1 0 1 1 0 8 0 sessionpl 144 25 0 8 1 0 1 1 0 8 0 pgrppl 48 26 0 9 1 0 1 1 0 8 0 ucredpl 104 469 0 457 1 0 1 1 0 8 0 zombiepl 144 866 0 864 1 0 1 1 0 8 0 processpl 1072 932 0 864 5 0 5 5 0 8 0 procpl 680 1762 0 1668 11 2 9 9 0 8 0 sosppl 168 3 0 3 1 1 0 1 0 8 0 sockpl 488 1158 0 1115 43 31 12 34 0 8 5 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 9 0 0 2 0 2 2 0 8 0 mcl4k 4096 11 0 0 2 0 2 2 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 274 0 0 35 0 35 35 0 8 0 mtagpl 96 95 0 0 3 0 3 3 0 8 0 mbufpl 256 966 0 0 59 0 59 59 0 8 0 bufpl 288 4918 0 151 341 0 341 341 0 8 0 anonpl 24 226963 0 213289 87 3 84 85 0 186 0 amapchunkpl 152 26133 0 25166 40 2 38 40 0 158 0 amappl16 200 5814 0 5466 20 0 20 20 0 8 1 amappl15 192 11 0 11 1 1 0 1 0 8 0 amappl14 184 162 0 148 2 1 1 2 0 8 0 amappl13 176 19 0 19 1 1 0 1 0 8 0 amappl12 168 1564 0 1535 3 1 2 2 0 8 0 amappl11 160 71 0 56 1 0 1 1 0 8 0 amappl10 152 37 0 28 1 0 1 1 0 8 0 amappl9 144 176 0 176 1 1 0 1 0 8 0 amappl8 136 176 0 129 2 0 2 2 0 8 0 amappl7 128 70 0 55 2 1 1 2 0 8 0 amappl6 120 242 0 223 2 1 1 2 0 8 0 amappl5 112 176 0 165 1 0 1 1 0 8 0 amappl4 104 602 0 559 3 1 2 3 0 8 0 amappl3 96 5550 0 5454 4 1 3 3 0 8 0 amappl2 88 1170 0 1099 3 0 3 3 0 8 0 amappl1 80 11826 0 11257 23 11 12 23 0 8 0 amappl 88 7637 0 7392 6 0 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 74 0 0 2 0 2 2 0 8 0 uaddrrnd 24 895 0 866 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 895 0 866 1 0 1 1 0 8 0 vmmpekpl 168 12599 0 12537 3 0 3 3 0 8 0 vmmpepl 168 75160 0 72880 116 13 103 116 0 357 1 vmsppl 464 894 0 866 5 1 4 5 0 8 0 rwobjpl 56 28028 0 24182 57 2 55 55 0 8 0 pdppl 4096 1798 0 1732 120 52 68 80 0 8 2 pvpl 32 513191 0 493657 337 23 314 335 0 265 154 pmappl 248 894 0 866 3 1 2 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 810 0 59 22 0 22 22 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace witness_checkorder(fffffd806f0af1c0,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f0af1b0) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000212ebd50,fffffd806f0af1b0,fffffd806f0af238,a,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000212ebd50,a) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000212ebd50) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000212ebd50,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000212ebd50,ffff80002e405e50,ffff80002e405ea0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e405f20) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e405f20) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b12bb573bc0, count: -9 ddb{0}> machine ddbcpu 1