uvm_fault(0xfffffd8060eac9b0, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff831def38 cs 8 rflags 10246 cr2 0 cpl 0 rsp ffff80003c485500 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff831def38 Starting stack trace... panic(ffffffff833a4594) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c485450) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001491000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff8000fffe87e8) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff8000fffe87e8) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c485600) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805cf85520,81,fffffd80097fb548,ffff8000fffe87e8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805e0e69d8,ffff8000fffe87e8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805e0e69d8,ffff8000fffe87e8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805e0e69d8,ffff8000fffe87e8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805e0e69d8,ffff8000fffe87e8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000fffe87e8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000fffe87e8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffe87e8,ffff80003c485970,ffff80003c4858c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c485970) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c485970) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79d050e07e50, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 1356889656 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *280925 90335 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x79d050e07e20, 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(0xfffffd8060eac9b0, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x79d050e07e20, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c467a70 rbx 0 rdx 0 rcx 0xffff8000fffe82b8 rax 0x3b r8 0xffff80003c4679a0 r9 0x1 r10 0x4d4197c3ac55ed80 r11 0x6bdbf71160cc23b7 r12 0 r13 0 r14 0xffff8000fffe82b8 r15 0 rip 0xffffffff82ec33ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c4679f0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=280925 pid=90335 tcnt=1 stat=onproc flags process=2 proc=0 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a270548,0xffff8000ffffcd10 process=0xffff8000fffe6b70 user=0xffff80003c462000, vmspace=0xfffffd8076dbf7b8 estcpu=36, cpticks=15, pctcpu=0.4, user=0, sys=15, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 46892 256131 47760 0 2 0xc80 syz-executor 46892 4150 47760 0 3 0x4000080 kqsel syz-executor 46892 60021 47760 0 3 0x4000080 fsleep syz-executor 20387 71431 48357 0 2 0xc80 syz-executor 20387 185911 48357 0 3 0x4000080 kqsel syz-executor 20387 238884 48357 0 3 0x4000080 fsleep syz-executor 32855 53164 0 0 3 0x14280 nfsidl nfsio 21503 408029 0 0 3 0x14280 nfsidl nfsio 5399 290546 0 0 3 0x14280 nfsidl nfsio 8757 324999 0 0 3 0x14280 nfsidl nfsio 28285 386774 0 0 3 0x14280 nfsidl nfsio 45991 516407 0 0 3 0x14280 nfsidl nfsio 89265 483335 0 0 3 0x14280 nfsidl nfsio 52003 481310 0 0 3 0x14280 nfsidl nfsio 42404 63975 0 0 3 0x14280 nfsidl nfsio 86881 399751 0 0 3 0x14280 nfsidl nfsio 59644 170732 0 0 3 0x14280 nfsidl nfsio 95397 434154 0 0 3 0x14280 nfsidl nfsio 36211 292493 0 0 3 0x14280 nfsidl nfsio 29473 106959 0 0 3 0x14280 nfsidl nfsio 99236 277861 0 0 3 0x14280 nfsidl nfsio 65658 210726 0 0 3 0x14280 nfsidl nfsio 17472 456258 0 0 3 0x14280 nfsidl nfsio 47486 4187 0 0 3 0x14280 nfsidl nfsio 75779 327097 0 0 3 0x14280 nfsidl nfsio 57400 491524 0 0 3 0x14280 nfsidl nfsio 54802 24085 46296 0 2 0xc82 syz-executor *90335 280925 46296 0 7 0x2 syz-executor 34836 392255 0 0 3 0x14200 bored sosplice 47760 124657 46296 0 2 0xc82 syz-executor 44145 167304 46296 0 2 0x2 syz-executor 48357 343463 46296 0 2 0xc82 syz-executor 58099 195488 46296 0 3 0x82 wait syz-executor 88987 55995 46296 0 3 0x82 wait syz-executor 84112 1815 46296 0 3 0x82 wait syz-executor 46296 285177 24722 0 3 0x82 kqread syz-executor 24722 135224 90361 0 3 0x10008a sigsusp ksh 90361 434440 78004 0 3 0x98 kqread sshd-session 78004 308242 1803 0 3 0x92 kqread sshd-session 73887 433724 1 0 3 0x100083 ttyopn getty 1803 451224 1 0 3 0x88 kqread sshd 20993 297874 58423 74 3 0x1100092 bpf pflogd 58423 434001 1 0 3 0x80 sbwait pflogd 28098 460960 9620 73 3 0x1100090 kqread syslogd 9620 72596 1 0 3 0x100082 sbwait syslogd 74706 119899 1 0 3 0x100080 kqread resolvd 10055 345614 16659 77 3 0x100092 kqread dhcpleased 3949 278322 16659 77 3 0x100092 kqread dhcpleased 16659 356059 1 0 3 0x80 kqread dhcpleased 55043 394466 0 0 2 0x40014200 smr 10884 312682 0 0 3 0x14200 pgzero zerothread 25194 121128 0 0 3 0x14200 aiodoned aiodoned 68081 475501 0 0 3 0x14200 syncer update 44409 153851 0 0 3 0x14200 cleaner cleaner 22666 495530 0 0 3 0x14200 reaper reaper 59818 273088 0 0 3 0x14200 pgdaemon pagedaemon 37587 359313 0 0 3 0x14200 bored viomb 47639 220600 0 0 3 0x40014200 acpi0 acpi0 95450 38177 0 0 3 0x40014200 idle1 68732 331666 0 0 3 0x14200 bored softnet1 12586 153974 0 0 3 0x14200 netlock softnet0 34784 252416 0 0 2 0x40014200 systqmp 39130 157669 0 0 3 0x14200 bored systq 91574 296687 0 0 2 0x14200 softclockmp 82669 116182 0 0 3 0x40014200 tmoslp softclock 74600 462185 0 0 7 0x40014200 idle0 1 23395 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10217 11146K 11411K 166960K 12023 0 pcb 17 12K 20K 166960K 127 0 rtable 221 10K 10K 166960K 373 0 pf 34 17K 81K 166960K 99 0 ifaddr 46 8K 8K 166960K 80 0 ifgroup 55 2K 2K 166960K 111 0 sysctl 3 1K 9K 166960K 11 0 counters 68 36K 37K 166960K 130 0 ioctlops 0 0K 4K 166960K 1688 0 iov 0 0K 32K 166960K 66 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1429 90K 90K 166960K 1878 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 616K 620K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 10 0K 0K 166960K 82 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 622 0 sigio 0 0K 0K 166960K 4 0 proc 73 131K 164K 166960K 659 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 55 0 in_multi 106 7K 7K 166960K 149 0 ether_multi 1 0K 0K 166960K 6 0 mrt 1 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 446 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 256 164K 172K 166960K 7322 0 UVM aobj 86 3K 3K 166960K 87 0 pinsyscall 43 86K 102K 166960K 1757 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 32 0 NDP 12 0K 2K 166960K 51 0 temp 76 8656K 8768K 166960K 37929 0 kqueue 13 20K 30K 166960K 116 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 65 0 62 1 0 1 1 0 8 0 rtentry 176 129 0 38 5 0 5 5 0 8 0 unpcb 144 544 0 525 10 8 2 6 0 8 1 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 209 0 200 7 3 4 4 0 8 3 arp 136 15 0 2 1 0 1 1 0 8 0 inpcb 328 570 0 555 8 4 4 5 0 8 2 nd6 152 22 0 4 1 0 1 1 0 8 0 pkpcb 40 6 0 6 3 2 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1192 24 0 24 3 2 1 1 0 8 1 pppxif 1504 2 0 2 2 1 1 1 0 8 1 pffrag 232 6 0 1 1 0 1 1 0 482 0 pffrnode 88 3 0 0 1 0 1 1 0 8 0 pffrent 40 11 0 4 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 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pfstitem 24 51 0 12 1 0 1 1 0 8 0 pfstkey 128 51 0 12 2 0 2 2 0 8 0 pfstate 384 51 0 12 5 0 5 5 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 613 0 149 32 2 30 30 0 8 0 art_table 40 615 0 149 5 0 5 5 0 8 0 art_node 32 128 0 48 1 0 1 1 0 8 0 semapl 112 78 0 70 1 0 1 1 0 8 0 shmpl 112 84 0 1 3 0 3 3 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2422 0 911 96 0 96 96 0 8 0 ffsino 296 2422 0 911 118 0 118 118 0 8 0 nchpl 144 3288 0 1586 64 0 64 64 0 8 0 rtmask 32 8 0 8 3 2 1 1 0 8 1 uvmvnodes 80 2853 0 0 59 0 59 59 0 8 0 vnodes 216 2853 0 0 159 0 159 159 0 8 0 namei 1024 10976 0 10976 6 4 2 2 0 8 2 percpumem 16 80 0 31 1 0 1 1 0 8 0 kstatmem 264 64 0 38 4 1 3 3 0 8 1 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 19201 0 19201 10 9 1 8 1 8 1 plimitpl 152 93 0 76 1 0 1 1 0 8 0 sigapl 424 937 0 868 9 1 8 8 0 8 0 knotepl 120 493 0 0 15 0 15 15 0 8 0 kqueuepl 224 300 0 288 7 2 5 5 0 8 4 pipepl 344 143 0 116 3 0 3 3 0 8 0 fdescpl 528 899 0 867 3 0 3 3 0 8 0 filepl 160 5009 0 4776 23 10 13 15 0 8 2 lockfpl 104 231 0 229 1 0 1 1 0 8 0 lockfspl 48 106 0 104 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 39 0 22 1 0 1 1 0 8 0 ucredpl 104 566 0 551 1 0 1 1 0 8 0 zombiepl 144 952 0 946 2 1 1 1 0 8 0 processpl 1232 937 0 868 6 0 6 6 0 8 0 procpl 664 1779 0 1706 8 0 8 8 0 8 0 sosppl 168 4 0 4 1 1 0 1 0 8 0 sockpl 752 1224 0 1187 33 23 10 17 0 8 6 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 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 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 128 0 0 16 0 16 16 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 170 0 0 11 0 11 11 0 8 0 bufpl 280 9057 0 2914 440 0 440 440 0 8 0 anonpl 32 19211 0 0 156 1 155 155 0 246 0 amapchunkpl 152 23338 0 22796 37 14 23 27 0 158 2 amappl16 200 4465 0 4435 64 49 15 51 0 8 5 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 116 0 104 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 1572 0 1539 3 1 2 2 0 8 0 amappl11 160 51 0 37 1 0 1 1 0 8 0 amappl10 152 20 0 20 1 1 0 1 0 8 0 amappl9 144 243 0 243 1 1 0 1 0 8 0 amappl8 136 47 0 45 1 0 1 1 0 8 0 amappl7 128 127 0 115 1 0 1 1 0 8 0 amappl6 120 198 0 194 1 0 1 1 0 8 0 amappl5 112 134 0 125 1 0 1 1 0 8 0 amappl4 104 305 0 285 1 0 1 1 0 8 0 amappl3 96 4047 0 3939 3 0 3 3 0 8 0 amappl2 88 1143 0 1063 2 0 2 2 0 8 0 amappl1 80 10497 0 9889 15 1 14 15 0 8 0 amappl 88 6537 0 6356 6 1 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 86 0 1 2 0 2 2 0 8 0 uaddrrnd 24 899 0 867 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 899 0 867 1 0 1 1 0 8 0 vmmpekpl 168 8773 0 8732 3 0 3 3 0 8 0 vmmpepl 168 64054 0 62001 136 35 101 131 0 357 3 vmsppl 488 898 0 867 6 1 5 5 0 8 0 rwobjpl 80 23380 0 19487 86 3 83 83 0 8 0 pdppl 4096 1806 0 1734 112 40 72 86 0 8 0 pvpl 32 27020 0 0 218 0 218 218 0 265 0 pmappl 256 898 0 867 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 298 0 52 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837d7ff0) 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(ffffffff83988bd0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83988bd0) at __mp_lock+0x192 sys/kern/kern_lock.c:165 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 acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffffffff837d7ff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: 6 ddb{0}> trace x86_ipi_db(ffffffff837d7ff0) 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(ffffffff83988bd0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83988bd0) at __mp_lock+0x192 sys/kern/kern_lock.c:165 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 acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffffffff837d7ff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x79d050e07e20, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x79d050e07e20, count: -1