uvm_fault(0xfffffd806c2335d0, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff828f47b8 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002a3246a0 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff828f47b8 Starting stack trace... panic(ffffffff833c98d0) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a3245f0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001479000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,2,2000,ffff80003c43cd20) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,2,2000,ffff80003c43cd20) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80002a3247a0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8064b4b3a0,2,fffffd80097fb4e0,ffff80003c43cd20) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd807d3243c0,ffff80003c43cd20) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd807d3243c0,ffff80003c43cd20) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd807d3243c0,ffff80003c43cd20) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd807d3243c0,ffff80003c43cd20) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c43cd20) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c43cd20,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c43cd20,ffff80002a324b10,ffff80002a324a60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a324b10) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a324b10) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f48ca703950, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 83 -2137506976 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND * 4389 54159 0 0 0 1 syz-executor 201285 55678 0 0x2 0x1 0 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x707ee128c890, 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}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd806c2335d0, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x707ee128c890, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c4363d0 rbx 0 rdx 0 rcx 0xffff80003c43c028 rax 0x3c r8 0xffff80003c436300 r9 0x1 r10 0x969f97d3c508009b r11 0x69328ef360c0c30a r12 0 r13 0 r14 0xffff80003c43c028 r15 0 rip 0xffffffff81abb3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c436350 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=4389 pid=54159 tcnt=4 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c43da18,0xffff80003c4e6fd8 process=0xffff8000fffedcf8 user=0xffff80003c431000, vmspace=0xfffffd806c233200 estcpu=36, cpticks=11, pctcpu=0.0, user=8, sys=3, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 25584 309020 88485 0 2 0x1 syz-executor 25584 85500 88485 0 3 0x4000080 fsleep syz-executor 79670 10426 55678 0 2 0 syz-executor 88148 273617 50471 0 2 0x2 syz-executor *54159 4389 92496 0 7 0 syz-executor 54159 281956 92496 0 2 0x4000000 syz-executor 54159 148249 92496 0 3 0x4000080 fsleep syz-executor 54159 401877 92496 0 3 0x4000080 fsleep syz-executor 44987 131776 60012 0 2 0 syz-executor 44987 187023 60012 0 3 0x4000080 fsleep syz-executor 44987 405363 60012 0 3 0x4000080 fsleep syz-executor 36072 381042 0 0 3 0x14200 acct acct 62681 28640 50471 0 2 0x3 syz-executor 92496 176040 50471 0 3 0x3 inode syz-executor 29092 363610 50471 0 2 0x2 syz-executor 55678 201285 50471 0 7 0x3 syz-executor 72667 333593 50471 0 2 0x3 syz-executor 60012 23263 50471 0 2 0x2 syz-executor 88485 169307 50471 0 3 0x82 nanoslp syz-executor 50471 24598 8504 0 3 0x82 kqread syz-executor 8504 192601 71938 0 3 0x10008a sigsusp ksh 71938 96109 2804 0 3 0x98 kqread sshd-session 2804 458216 18583 0 3 0x92 kqread sshd-session 42782 219040 1 0 3 0x100083 ttyin getty 18583 101106 1 0 3 0x88 kqread sshd 11544 463236 85310 74 3 0x1100092 bpf pflogd 85310 199643 1 0 3 0x80 sbwait pflogd 86311 237251 59961 73 3 0x1100090 kqread syslogd 59961 343934 1 0 3 0x100082 sbwait syslogd 22935 164937 1 0 3 0x100080 kqread resolvd 89822 505004 98682 77 3 0x100092 kqread dhcpleased 47200 446282 98682 77 3 0x100092 kqread dhcpleased 98682 411969 1 0 3 0x80 kqread dhcpleased 42794 442788 0 0 3 0x14200 bored smr 80705 446952 0 0 2 0x14200 zerothread 80407 205841 0 0 3 0x14200 aiodoned aiodoned 44177 321677 0 0 3 0x14200 syncer update 84425 297899 0 0 3 0x14200 cleaner cleaner 18735 484374 0 0 2 0x14200 reaper 15019 458615 0 0 3 0x14200 pgdaemon pagedaemon 5697 332567 0 0 3 0x14200 bored viomb 35317 319225 0 0 3 0x40014200 acpi0 acpi0 30823 509521 0 0 3 0x40014200 idle1 79629 380091 0 0 3 0x14200 bored softnet1 86134 227667 0 0 3 0x14200 netlock softnet0 39657 131768 0 0 2 0x40014200 systqmp 73066 121355 0 0 3 0x14200 bored systq 78119 430092 0 0 3 0x14200 tmoslp softclockmp 53446 224622 0 0 3 0x40014200 tmoslp softclock 14434 196607 0 0 3 0x40014200 idle0 1 420963 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 88148 (syz-executor) thread 0xffff80003c4e6fc8 (273617) Process 29092 (syz-executor) thread 0xffff80003c4e6d30 (363610) Process 18735 (reaper) thread 0xffff8000ffffdc90 (484374) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10254 11074K 11420K 166960K 15387 0 pcb 17 24K 26K 166960K 1151 0 rtable 176 12K 13K 166960K 1524 0 pf 45 19K 67487K 166960K 539 0 ifaddr 36 7K 9K 166960K 380 0 ifgroup 71 3K 3K 166960K 641 0 sysctl 4 1K 9K 166960K 37 0 counters 74 37K 38K 166960K 876 0 ioctlops 0 0K 4K 166960K 2322 0 iov 0 0K 16K 166960K 387 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1585 100K 100K 166960K 4767 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 48 0 VM map 2 1K 1K 166960K 2 0 sem 19 120K 120K 166960K 182 0 dirhash 12 2K 2K 166960K 54 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 3783 0 sigio 0 0K 0K 166960K 66 0 proc 74 115K 163K 166960K 1569 0 subproc 72 4K 4K 166960K 291 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 584 0 in_multi 57 4K 7K 166960K 500 0 ether_multi 1 0K 0K 166960K 37 0 mrt 2 0K 0K 166960K 34 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 229 1023K 1023K 166960K 229 0 exec 0 0K 1K 166960K 1255 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 237 159K 178K 166960K 36086 0 UVM aobj 64 18K 18K 166960K 65 0 pinsyscall 43 86K 103K 166960K 5515 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 258 0 NDP 15 0K 1K 166960K 294 0 temp 80 8660K 8924K 166960K 151167 0 kqueue 13 20K 32K 166960K 716 0 SYN cache 2 16K 16K 166960K 2 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 120 426 0 423 2 1 1 2 0 8 0 rtentry 176 506 0 448 6 0 6 6 0 8 0 unpcb 144 2386 0 2369 28 22 6 6 0 8 5 syncache 336 8 0 8 5 5 0 1 0 8 0 tcpqe 32 6 0 6 4 4 0 1 0 8 0 tcpcb 736 1367 0 1362 41 34 7 10 0 8 6 arp 136 73 0 61 1 0 1 1 0 8 0 inpcb 328 5305 0 5297 75 66 9 15 0 8 8 nd6 152 101 0 88 2 0 2 2 0 8 0 pkpcb 40 17 0 17 9 8 1 1 0 8 1 kcovpl 48 32 0 24 1 0 1 1 0 8 0 ppxss 1192 345 0 344 2 1 1 1 0 8 0 pppxif 1504 24 0 24 9 8 1 1 0 8 1 pffrag 232 54 0 42 1 0 1 1 0 482 0 pffrnode 88 46 0 35 1 0 1 1 0 8 0 pffrent 40 160 0 146 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 pfrktable 1344 3 0 3 2 2 0 1 0 8 0 pfstitem 24 213 0 149 1 0 1 1 0 8 0 pfstkey 128 213 0 149 3 0 3 3 0 8 0 pfstate 384 212 0 149 8 1 7 7 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 6 0 6 6 6 0 1 0 8 0 art_heap8 4096 5 0 1 5 1 4 5 0 8 0 art_heap4 256 2486 0 2191 62 38 24 37 0 8 1 art_table 40 2491 0 2192 6 1 5 6 0 8 0 art_node 32 502 0 451 1 0 1 1 0 8 0 sysvmsgpl 40 52 0 48 1 0 1 1 0 8 0 semupl 112 4 0 4 4 3 1 1 0 8 1 semapl 112 173 0 156 1 0 1 1 0 8 0 shmpl 112 54 0 1 2 0 2 2 0 8 0 dirhash 1024 45 0 28 3 0 3 3 0 8 0 dino2pl 256 8400 0 6847 98 0 98 98 0 8 0 ffsino 296 8400 0 6847 120 0 120 120 0 8 0 nchpl 144 13297 0 11533 66 0 66 66 0 8 0 rtmask 32 38 0 38 7 6 1 1 0 8 1 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 49922 0 49922 8 7 1 4 0 8 1 percpumem 16 453 0 401 1 0 1 1 0 8 0 vcpupl 3968 8 0 0 1 0 1 1 0 8 0 vmpool 840 8 0 0 1 0 1 1 0 8 0 kstatmem 264 468 0 432 4 1 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 14 0 14 6 6 0 1 0 8 0 scxspl 216 69907 0 69907 16 14 2 8 1 8 2 plimitpl 152 961 0 944 1 0 1 1 0 8 0 sigapl 424 4065 0 4016 8 1 7 8 0 8 0 knotepl 120 691 0 0 17 0 17 17 0 8 0 kqueuepl 224 1504 0 1493 14 13 1 5 0 8 0 pipepl 344 579 0 551 15 11 4 9 0 8 1 fdescpl 528 4019 0 3987 3 0 3 3 0 8 0 filepl 160 29483 0 29266 61 46 15 20 0 8 3 lockfpl 104 1642 0 1635 3 2 1 2 0 8 0 lockfspl 48 605 0 598 1 0 1 1 0 8 0 sessionpl 144 50 0 41 1 0 1 1 0 8 0 pgrppl 48 209 0 192 1 0 1 1 0 8 0 ucredpl 104 5082 0 5069 1 0 1 1 0 8 0 zombiepl 144 6093 0 6091 2 1 1 1 0 8 0 processpl 1232 4065 0 4016 6 1 5 6 0 8 0 procpl 664 10149 0 10091 10 4 6 8 0 8 0 sosppl 176 31 0 31 9 9 0 1 0 8 0 sockpl 752 8215 0 8187 111 100 11 21 0 8 8 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 110 0 0 14 0 14 14 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 55 0 0 5 0 5 5 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 1886 0 0 113 0 113 113 0 8 0 bufpl 280 27578 0 21441 439 0 439 439 0 8 0 anonpl 32 15118 0 0 121 0 121 121 0 246 0 amapchunkpl 152 139192 0 138718 105 70 35 36 0 158 15 amappl16 200 12190 0 12158 132 113 19 34 0 8 8 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 27 0 27 3 3 0 1 0 8 0 amappl13 176 699 0 698 1 0 1 1 0 8 0 amappl12 168 4531 0 4490 4 1 3 3 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 50 0 36 1 0 1 1 0 8 0 amappl9 144 337 0 336 2 1 1 1 0 8 0 amappl8 136 29 0 27 1 0 1 1 0 8 0 amappl7 128 173 0 170 1 0 1 1 0 8 0 amappl6 120 575 0 561 1 0 1 1 0 8 0 amappl5 112 92 0 80 1 0 1 1 0 8 0 amappl4 104 560 0 530 1 0 1 1 0 8 0 amappl3 96 22036 0 21946 4 1 3 3 0 8 0 amappl2 88 4091 0 4014 2 0 2 2 0 8 0 amappl1 80 26466 0 25874 17 3 14 15 0 8 0 amappl 88 34396 0 34235 5 0 5 5 0 92 0 uvmvnodes 80 197 0 0 5 0 5 5 0 8 0 dma65536 65536 2 0 2 2 2 0 1 0 8 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 3 0 3 2 2 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma512 512 2 0 2 1 1 0 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 256 0 256 4 4 0 1 0 8 0 dma64 64 9 0 9 2 2 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 21 0 20 1 0 1 1 0 8 0 aobjpl 72 64 0 1 2 0 2 2 0 8 0 uaddrrnd 24 4018 0 3987 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4018 0 3987 1 0 1 1 0 8 0 vmmpekpl 168 29393 0 29329 4 0 4 4 0 8 0 vmmpepl 168 255730 0 253789 169 54 115 115 0 357 15 vmsppl 488 4018 0 3987 6 1 5 5 0 8 0 rwobjpl 80 66031 0 64834 44 6 38 38 0 8 4 pdppl 4096 8060 0 7982 146 66 80 84 0 8 2 pvpl 32 21517 0 0 173 1 172 173 0 265 0 pmappl 256 4026 0 3987 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 517 0 161 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837c5ff0) 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(ffffffff83922fc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:138 [inline] __mp_lock(ffffffff83922fc0) at __mp_lock+0x192 sys/kern/kern_lock.c:169 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff83922fc0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:138 [inline] __mp_lock(ffffffff83922fc0) at __mp_lock+0x199 sys/kern/kern_lock.c:169 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff83922fc0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:138 [inline] __mp_lock(ffffffff83922fc0) at __mp_lock+0x199 sys/kern/kern_lock.c:169 __mp_acquire_count(ffffffff83922fc0,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:367 end trace frame: 0xffff8000fffe8fe0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff837c5ff0) 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(ffffffff83922fc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:138 [inline] __mp_lock(ffffffff83922fc0) at __mp_lock+0x192 sys/kern/kern_lock.c:169 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff83922fc0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:138 [inline] __mp_lock(ffffffff83922fc0) at __mp_lock+0x199 sys/kern/kern_lock.c:169 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff83922fc0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:138 [inline] __mp_lock(ffffffff83922fc0) at __mp_lock+0x199 sys/kern/kern_lock.c:169 __mp_acquire_count(ffffffff83922fc0,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:367 rw_do_enter_write(fffffd806e2ca330,1) at rw_do_enter_write+0x1dc sys/kern/kern_rwlock.c:298 rrw_enter(fffffd806e2ca330,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd80658d80f0,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd80658d80f0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vget(fffffd80658d80f0,2001) at vget+0x2a2 sys/kern/vfs_subr.c:686 ktrwriteraw(ffff80002a290018,fffffd80658d80f0,fffffd80097fb4e0,ffff8000fffe9260,ffff8000fffe9240) at ktrwriteraw+0x175 sys/kern/kern_ktrace.c:688 ktrsyscall(ffff80002a290018,b,20,ffff8000fffe93f0) at ktrsyscall+0x340 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff80002a290018,b,20,ffff8000fffe93f0) at ktrsyscall+0x340 sys/kern/kern_ktrace.c:183 syscall(ffff8000fffe93f0) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff8000fffe93f0) at syscall+0x304 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7acb051692e0, count: -23 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x707ee128c890, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x707ee128c890, count: -1