uvm_fault(0xfffffd806be56018, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff82a83cd0 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002a2afb20 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff82a83cd0 Starting stack trace... panic(ffffffff8333e810) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a2afa70) at kerntrap+0x29b sys/arch/amd64/amd64/trap.c:327 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001484000) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:579 dtclose(11e5f,81,2000,ffff80002a290cf0) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80002a290cf0) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002a2afc20) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806dd56488,81,fffffd807f7d2478,ffff80002a290cf0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806be7a180,ffff80002a290cf0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806be7a180,ffff80002a290cf0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806be7a180,ffff80002a290cf0) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd806be7a180,ffff80002a290cf0) at closef+0x192 sys/kern/kern_descrip.c:1249 fdfree(ffff80002a290cf0) at fdfree+0x116 sys/kern/kern_descrip.c:1181 exit1(ffff80002a290cf0,0,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff80002a290cf0,ffff80002a2aff90,ffff80002a2afee0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a2aff90) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2aff90) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70fdab90e9a0, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 83 1490947600 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x680 TID PID UID PRFLAGS PFLAGS CPU COMMAND 384797 79078 0 0 0 0 syz-executor *466986 51302 0 0 0x4000000 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x23debd9ddc0, count: 14 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd806be56018, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x23debd9ddc0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a30ec20 rbx 0 rdx 0xffff80000145e7c0 rcx 0xffff800031ff07f0 rax 0x3b r8 0xffff80002a30eb50 r9 0x1 r10 0x446eda24d19f93f r11 0x91b94b85bd27890f r12 0 r13 0 r14 0xffff800031ff07f0 r15 0 rip 0xffffffff81a0b3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a30eba0 ss 0x10 savectx+0xae: movl $0,%gs:0x680 ddb{1}> show proc PROC (syz-executor) tid=466986 pid=51302 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2914a0,0xffff800031ff0fb0 process=0xffff8000fffece10 user=0xffff80002a309000, vmspace=0xfffffd806be565b8 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 41046 440521 57890 0 2 0 syz-executor 41046 263860 57890 0 3 0x4000080 fsleep syz-executor 41046 301305 57890 0 3 0x4000080 fsleep syz-executor 41046 158167 57890 0 2 0x4000000 syz-executor 82242 19295 38992 0 2 0 syz-executor 82242 256559 38992 0 2 0x4000000 syz-executor 15029 152121 13102 0 2 0 syz-executor 15029 162604 13102 0 3 0x4000080 fsleep syz-executor 83487 146559 55529 0 2 0 syz-executor 83487 291110 55529 0 3 0x4000080 fsleep syz-executor 79078 384797 3107 0 7 0 syz-executor 79078 350919 3107 0 3 0x4000080 fsleep syz-executor 79078 52291 3107 0 2 0x4000000 syz-executor 51302 333621 84497 0 2 0 syz-executor 51302 27840 84497 0 3 0x4000000 smrbar syz-executor *51302 466986 84497 0 7 0x4000000 syz-executor 14753 270616 1 0 3 0x82 nanoslp getty 13102 339867 3173 0 2 0x482 syz-executor 55529 211853 3173 0 2 0x482 syz-executor 83808 119819 0 0 3 0x14200 acct acct 57890 473612 3173 0 2 0x482 syz-executor 3107 121681 3173 0 2 0x482 syz-executor 61888 230642 3173 0 2 0x482 syz-executor 39531 211362 3173 0 3 0x82 wait syz-executor 84497 311535 3173 0 2 0x482 syz-executor 38992 104227 3173 0 2 0x482 syz-executor 59865 432057 0 0 3 0x14200 bored sosplice 3173 113642 77528 0 3 0x82 kqread syz-executor 77528 138872 64697 0 3 0x10008a sigsusp ksh 64697 169721 59689 0 3 0x98 kqread sshd-session 59689 461423 46971 0 3 0x92 kqread sshd-session 46971 160982 1 0 3 0x88 kqread sshd 51258 48210 42151 74 2 0x1100092 pflogd 42151 86673 1 0 3 0x80 sbwait pflogd 91954 133558 34032 73 3 0x1100090 kqread syslogd 34032 515351 1 0 3 0x100082 sbwait syslogd 84959 507136 1 0 3 0x100080 kqread resolvd 68900 234559 0 0 2 0x40014200 smr 23130 404783 0 0 2 0x14200 zerothread 25444 87718 0 0 3 0x14200 aiodoned aiodoned 76482 38006 0 0 3 0x14200 syncer update 5438 377119 0 0 3 0x14200 cleaner cleaner 24846 383992 0 0 2 0x14200 reaper 83753 396834 0 0 3 0x14200 pgdaemon pagedaemon 54879 414385 0 0 3 0x14200 bored viomb 94319 10264 0 0 3 0x40014200 acpi0 acpi0 94386 24801 0 0 3 0x40014200 idle1 22724 427369 0 0 3 0x14200 bored softnet3 60619 491060 0 0 3 0x14200 bored softnet2 38743 68849 0 0 3 0x14200 bored softnet1 36030 210576 0 0 2 0x14200 softnet0 85751 60670 0 0 2 0x14200 systqmp 32432 7595 0 0 3 0x14200 bored systq 89814 48457 0 0 2 0x14200 softclockmp 21842 177894 0 0 2 0x40014200 softclock 50886 171681 0 0 3 0x40014200 idle0 1 440573 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 82242 (syz-executor) thread 0xffff800031ff1750 (256559) Process 51302 (syz-executor) thread 0xffff800031ff0d10 (27840) Process 24846 (reaper) thread 0xffff8000ffffd488 (383992) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10238 11080K 12429K 166960K 16451 0 pcb 17 20K 22K 166960K 1523 0 rtable 232 13K 14K 166960K 1577 0 pf 39 18K 22K 166960K 508 0 ifaddr 38 7K 8K 166960K 341 0 ifgroup 64 2K 3K 166960K 591 0 sysctl 4 1K 3K 166960K 18 0 counters 68 36K 37K 166960K 656 0 ioctlops 0 0K 4K 166960K 2999 0 iov 0 0K 28K 166960K 522 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1481 93K 94K 166960K 5451 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 80 0 VM map 2 1K 1K 166960K 2 0 sem 26 61K 81K 166960K 124 0 dirhash 15 2K 3K 166960K 129 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 102K 166960K 5586 0 sigio 0 0K 0K 166960K 456 0 proc 66 67K 140K 166960K 1785 0 subproc 72 4K 4K 166960K 264 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 1170 0 in_multi 71 5K 7K 166960K 549 0 ether_multi 1 0K 0K 166960K 62 0 mrt 1 0K 0K 166960K 34 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 1381 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 235 135K 183K 166960K 50536 0 UVM aobj 131 5K 6K 166960K 135 0 pinsyscall 37 74K 104K 166960K 7366 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 426 0 NDP 14 0K 2K 166960K 239 0 temp 82 8692K 8948K 166960K 245905 0 kqueue 11 17K 36K 166960K 968 0 SYN cache 2 4K 18K 166960K 4 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 717 0 715 8 7 1 3 0 8 0 rtentry 176 493 0 402 6 1 5 6 0 8 0 unpcb 144 4984 0 4972 45 44 1 9 0 8 0 syncache 336 30 0 30 15 14 1 1 0 8 1 tcpqe 32 6 20 6 4 3 1 1 0 8 1 tcpcb 808 2218 0 2205 52 49 3 11 0 8 0 arp 128 74 0 51 1 0 1 1 0 8 0 inpcb 384 7395 0 7380 89 85 4 16 0 8 0 nd6 144 120 0 101 3 2 1 2 0 8 0 pkpcb 40 108 0 108 13 13 0 1 0 8 0 kcovpl 48 29 0 21 1 0 1 1 0 8 0 mppekey 1024 8 0 8 6 5 1 1 0 8 1 ppxss 1192 214 0 214 8 7 1 1 0 8 1 pppxif 1504 79 0 79 10 9 1 1 0 8 1 pffrag 232 21 0 15 1 0 1 1 0 482 0 pffrnode 88 20 0 14 1 0 1 1 0 8 0 pffrent 40 46 0 40 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 24 360 0 243 1 0 1 1 0 8 0 pfstkey 128 360 0 243 4 0 4 4 0 8 0 pfstate 384 360 0 243 12 0 12 12 0 8 0 pfrule 1344 24 0 18 2 1 1 2 0 8 0 rttmr 136 3 0 3 2 2 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 2245 0 1900 52 27 25 31 0 8 0 art_table 32 2249 0 1900 4 0 4 4 0 8 0 art_node 16 478 0 402 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 9 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 118 0 94 1 0 1 1 0 8 0 shmpl 112 132 0 4 4 0 4 4 0 8 0 dirhash 1024 95 0 76 3 0 3 3 0 8 0 dino2pl 256 11414 0 9856 98 0 98 98 0 8 0 ffsino 288 11414 0 9856 112 0 112 112 0 8 0 nchpl 144 18976 0 18388 64 39 25 64 0 8 0 rtmask 32 26 0 26 9 9 0 1 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 72966 0 72966 10 9 1 2 0 8 1 percpumem 16 343 0 294 1 0 1 1 0 8 0 kstatmem 264 356 0 328 4 1 3 3 0 8 0 scsiplug 72 25 0 25 13 13 0 1 0 8 0 scxspl 216 56958 0 56958 18 16 2 8 1 8 2 plimitpl 152 1077 0 1061 1 0 1 1 0 8 0 sigapl 424 5901 0 5852 11 5 6 9 0 8 0 futexpl 64 84953 0 84948 1 0 1 1 0 8 0 knotepl 120 836 0 0 23 0 23 23 0 8 0 kqueuepl 224 2179 0 2170 28 27 1 9 0 8 0 pipepl 336 832 0 804 14 8 6 6 0 8 3 fdescpl 520 5848 0 5819 3 0 3 3 0 8 0 filepl 160 44202 0 43994 71 59 12 24 0 8 0 lockfpl 104 2028 0 1970 4 2 2 3 0 8 0 lockfspl 48 582 0 556 1 0 1 1 0 8 0 sessionpl 144 71 0 64 1 0 1 1 0 8 0 pgrppl 48 162 0 147 1 0 1 1 0 8 0 ucredpl 104 7168 0 7158 1 0 1 1 0 8 0 zombiepl 144 6013 0 6011 4 3 1 1 0 8 0 processpl 1192 5901 0 5852 6 1 5 6 0 8 0 procpl 656 13830 0 13770 9 2 7 8 0 8 0 srpgc 96 42 0 42 15 15 0 1 0 8 0 sosppl 168 26 0 26 9 8 1 1 0 8 1 sockpl 728 13286 0 13259 144 139 5 22 0 8 0 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 161 0 0 15 0 15 15 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 80 0 0 7 1 6 7 0 8 0 mtagpl 96 127 0 0 3 0 3 3 0 8 1 mbufpl 256 1315 0 0 76 0 76 76 0 8 0 bufpl 280 17446 0 11302 440 0 440 440 0 8 0 anonpl 32 16956 0 0 136 0 136 136 0 246 0 amapchunkpl 152 169988 0 169367 89 61 28 35 0 158 0 amappl16 200 12146 0 11790 73 46 27 40 0 8 0 amappl15 192 6 0 6 3 3 0 1 0 8 0 amappl14 184 211 0 202 1 0 1 1 0 8 0 amappl13 176 55 0 55 2 2 0 1 0 8 0 amappl12 168 6864 0 6834 4 2 2 3 0 8 0 amappl11 160 51 0 43 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 257 0 255 1 0 1 1 0 8 0 amappl8 136 52 0 49 1 0 1 1 0 8 0 amappl7 128 202 0 193 1 0 1 1 0 8 0 amappl6 120 409 0 405 1 0 1 1 0 8 0 amappl5 112 231 0 223 1 0 1 1 0 8 0 amappl4 104 486 0 465 1 0 1 1 0 8 0 amappl3 96 36496 0 36388 4 0 4 4 0 8 0 amappl2 88 1162 0 1114 2 0 2 2 0 8 0 amappl1 80 38024 0 37496 16 1 15 16 0 8 0 amappl 88 48213 0 48034 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma16384 16384 1 0 1 1 1 0 1 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 8 0 8 3 3 0 1 0 8 0 dma128 128 256 0 256 4 4 0 1 0 8 0 dma64 64 7 0 7 2 2 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 134 0 4 3 0 3 3 0 8 0 uaddrrnd 24 5848 0 5819 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5848 0 5819 1 0 1 1 0 8 0 vmmpekpl 168 40499 0 40429 4 0 4 4 0 8 0 vmmpepl 168 367747 0 365641 171 62 109 123 0 357 0 vmsppl 480 5847 0 5819 6 1 5 5 0 8 0 rwobjpl 72 89615 0 82408 151 14 137 141 0 8 0 pdppl 4096 11704 0 11638 220 154 66 88 0 8 0 pvpl 32 25101 0 0 201 0 201 201 0 265 0 pmappl 256 5847 0 5819 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 700 0 276 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837edff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff838f4440) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838f4440) at __mp_lock+0x192 sys/kern/kern_lock.c:144 uvm_fault(fffffd806ebe4d28,2de92649000,0,1) at uvm_fault+0x1ee sys/uvm/uvm_fault.c:689 upageflttrap(ffff8000380193c0,2de92649000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000380193c0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x75fa1f4597f0, count: 7 ddb{0}> trace x86_ipi_db(ffffffff837edff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff838f4440) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838f4440) at __mp_lock+0x192 sys/kern/kern_lock.c:144 uvm_fault(fffffd806ebe4d28,2de92649000,0,1) at uvm_fault+0x1ee sys/uvm/uvm_fault.c:689 upageflttrap(ffff8000380193c0,2de92649000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000380193c0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x75fa1f4597f0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x680 savectx() at savectx+0xae end of kernel end trace frame: 0x23debd9ddc0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x23debd9ddc0, count: -1