uvm_fault(0xfffffd8074caaba0, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff82ed3ad8 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80003783da00 gsbase 0xffff8000299fdff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff82ed3ad8 Starting stack trace... panic(ffffffff8339e0d2) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003783d950) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001540000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80002a2c77a0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80002a2c77a0) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003783db00) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8061d74448,81,fffffd80097fb750,ffff80002a2c77a0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805aa13ba8,ffff80002a2c77a0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805aa13ba8,ffff80002a2c77a0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805aa13ba8,ffff80002a2c77a0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805aa13ba8,ffff80002a2c77a0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a2c77a0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a2c77a0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a2c77a0,ffff80003783de70,ffff80003783ddc0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003783de70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003783de70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x762e6b31ac30, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 -453245864 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 438081 98612 0 0 0 0 syz-executor *194436 68694 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x78c4e4fc0440, 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(0xfffffd8074caaba0, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x78c4e4fc0440, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a3cd3d0 rbx 0 rdx 0 rcx 0xffff8000ffff3a00 rax 0x3b r8 0xffff80002a3cd300 r9 0x1 r10 0xc8700669d7e63f33 r11 0xa53b0e20ba863da7 r12 0 r13 0 r14 0xffff8000ffff3a00 r15 0 rip 0xffffffff8323d3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a3cd350 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=194436 pid=68694 tcnt=1 stat=onproc flags process=2 proc=0 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff27d8,0xffff8000ffff3778 process=0xffff8000ffff75a8 user=0xffff80002a3c8000, vmspace=0xfffffd800b0271e8 estcpu=36, cpticks=140, pctcpu=0.33, user=2, sys=135, intr=3 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 39420 498102 97292 0 2 0 syz-executor 98612 438081 68694 0 7 0 syz-executor 98612 335224 68694 0 2 0x4000000 syz-executor 64365 189684 8745 0 2 0 syz-executor 64365 246867 8745 0 3 0x4000080 fsleep syz-executor 88963 234436 39365 0 3 0x80 nanoslp syz-executor 88963 352387 39365 0 2 0x4000000 syz-executor 88963 318566 39365 0 3 0x4000080 fsleep syz-executor 88963 73135 39365 0 3 0x4000080 fsleep syz-executor 88619 181451 75991 0 3 0x80 nanoslp syz-executor 88619 234651 75991 0 3 0x4000080 ttyout syz-executor 88619 221654 75991 0 3 0x4000080 ttyout syz-executor 88619 222347 75991 0 3 0x4000080 ttyout syz-executor 88619 379580 75991 0 2 0x4000000 syz-executor 88619 281165 75991 0 3 0x4000080 fsleep syz-executor 86291 9963 0 0 3 0x14280 nfsidl nfsio 4581 48138 0 0 3 0x14280 nfsidl nfsio 86827 382110 0 0 3 0x14280 nfsidl nfsio 8745 71842 84641 0 3 0x82 nanoslp syz-executor 75991 57521 84641 0 3 0x82 nanoslp syz-executor 14686 452307 84641 0 3 0x82 nanoslp syz-executor 49432 255853 0 0 3 0x14200 bored sosplice 97292 99829 84641 0 3 0x82 nanoslp syz-executor *68694 194436 84641 0 7 0x2 syz-executor 39365 91825 84641 0 3 0x82 nanoslp syz-executor 63324 99133 84641 0 3 0x82 nanoslp syz-executor 34549 432971 84641 0 3 0x2 biowait syz-executor 84641 12207 34432 0 3 0x82 kqread syz-executor 34432 511379 82465 0 3 0x10008a sigsusp ksh 82465 62529 13048 0 3 0x98 kqread sshd-session 13048 493199 65742 0 3 0x92 kqread sshd-session 23759 337315 1 0 3 0x100083 ttyin getty 65742 70759 1 0 3 0x88 kqread sshd 72886 36166 6740 74 3 0x1100092 bpf pflogd 6740 338819 1 0 3 0x80 sbwait pflogd 15013 168985 31896 73 3 0x1100090 kqread syslogd 31896 500519 1 0 3 0x100082 sbwait syslogd 70263 251090 1 0 3 0x100080 kqread resolvd 88933 132759 10060 77 3 0x100092 kqread dhcpleased 21845 29856 10060 77 3 0x100092 kqread dhcpleased 10060 501838 1 0 3 0x80 kqread dhcpleased 57217 418742 0 0 3 0x14200 bored smr 47928 102045 0 0 2 0x14200 zerothread 1292 448459 0 0 3 0x14200 aiodoned aiodoned 29909 14832 0 0 3 0x14200 syncer update 4131 204319 0 0 3 0x14200 cleaner cleaner 2056 10692 0 0 3 0x14200 reaper reaper 66908 93801 0 0 3 0x14200 pgdaemon pagedaemon 59111 123170 0 0 3 0x14200 bored viomb 25098 432474 0 0 3 0x40014200 acpi0 acpi0 82009 2464 0 0 3 0x40014200 idle1 3584 154058 0 0 3 0x14200 bored softnet7 48507 110082 0 0 3 0x14200 bored softnet6 65349 4421 0 0 3 0x14200 bored softnet5 79723 121497 0 0 3 0x14200 bored softnet4 98788 420215 0 0 3 0x14200 bored softnet3 88645 38770 0 0 3 0x14200 bored softnet2 90504 295591 0 0 3 0x14200 bored softnet1 20529 39217 0 0 3 0x14200 netlock softnet0 31808 6488 0 0 2 0x14200 systqmp 65811 441354 0 0 3 0x14200 bored systq 60550 450389 0 0 3 0x14200 tmoslp softclockmp 73563 52332 0 0 3 0x40014200 tmoslp softclock 552 24991 0 0 3 0x40014200 idle0 1 84898 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 34549 (syz-executor) thread 0xffff80002a2b27e0 (432971) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10262 11087K 13899K 166960K 16782 0 pcb 18 18K 24K 166960K 1076 0 rtable 216 12K 13K 166960K 817 0 pf 43 19K 82K 166960K 394 0 ifaddr 37 6K 8K 166960K 165 0 ifgroup 63 2K 2K 166960K 333 0 sysctl 4 1K 9K 166960K 26 0 counters 72 37K 37K 166960K 336 0 ioctlops 0 0K 4K 166960K 2028 0 iov 0 0K 28K 166960K 258 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1558 98K 98K 166960K 4375 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 350 0 dirhash 12 2K 2K 166960K 51 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 240K 166960K 2979 0 sigio 0 0K 0K 166960K 42 0 proc 73 115K 164K 166960K 989 0 subproc 72 4K 4K 166960K 108 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 603 0 in_multi 64 4K 7K 166960K 228 0 ether_multi 1 0K 0K 166960K 20 0 mrt 1 0K 0K 166960K 17 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 259 1155K 1155K 166960K 259 0 exec 0 0K 1K 166960K 886 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 6 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 249 152K 175K 166960K 28814 0 UVM aobj 42 2K 2K 166960K 45 0 pinsyscall 42 84K 102K 166960K 4160 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 209 0 NDP 14 0K 2K 166960K 126 0 temp 83 8652K 8780K 166960K 120910 0 kqueue 13 20K 32K 166960K 595 0 SYN cache 2 8K 16K 166960K 3 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 120 411 0 408 6 4 2 3 0 8 1 rtentry 176 211 0 134 5 0 5 5 0 8 0 unpcb 144 2282 0 2258 20 16 4 6 0 8 3 syncache 336 12 0 12 8 7 1 1 0 8 1 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 1022 0 1016 24 23 1 7 0 8 0 arp 128 30 0 16 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 130 0 130 2 2 0 2 0 8 0 inpcb 328 3601 0 3588 41 34 7 15 0 8 5 nd6 144 35 0 20 1 0 1 1 0 8 0 pkpcb 40 34 0 34 6 5 1 1 0 8 1 kcovpl 48 12 0 4 1 0 1 1 0 8 0 ppxss 1192 100 0 100 5 4 1 1 0 8 1 pppxif 1504 7 0 7 5 4 1 1 0 8 1 pfstscr 40 8 0 8 2 1 1 1 0 8 1 pffrag 232 25 0 16 1 0 1 1 0 482 0 pffrnode 88 20 0 12 1 0 1 1 0 8 0 pffrent 40 106 0 96 1 0 1 1 0 8 0 pfosfp 40 1428 0 1428 5 5 0 5 0 8 0 pfosfpen 112 1428 0 1428 21 12 9 21 0 8 9 pfrktable 1344 12 0 12 4 3 1 1 0 8 1 pfanchor 1288 5 0 2 1 0 1 1 0 8 0 pftag 88 9 0 4 1 0 1 1 0 8 0 pfstitem 24 151 0 74 1 0 1 1 0 8 0 pfstkey 128 164 0 88 3 0 3 3 0 8 0 pfstate 384 158 0 83 8 0 8 8 0 8 0 pfrule 1344 116 0 111 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 944 0 609 34 8 26 30 0 8 1 art_table 40 948 0 609 5 0 5 5 0 8 0 art_node 32 209 0 147 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0 semupl 112 9 0 9 5 4 1 1 0 8 1 semapl 112 345 0 335 1 0 1 1 0 8 0 shmpl 112 42 0 3 2 0 2 2 0 8 0 dirhash 1024 44 0 27 3 0 3 3 0 8 0 dino2pl 256 7019 0 5505 96 0 96 96 0 8 0 ffsino 296 7019 0 5505 118 0 118 118 0 8 0 nchpl 144 11114 0 9412 64 0 64 64 0 8 0 rtmask 32 19 0 19 7 6 1 1 0 8 1 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 39518 0 39517 4 3 1 2 0 8 0 percpumem 16 183 0 132 1 0 1 1 0 8 0 pfiaddrpl 120 3 0 3 1 1 0 1 0 8 0 kstatmem 264 210 0 176 6 3 3 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 11 0 11 3 3 0 1 0 8 0 scxspl 216 75809 0 75808 14 12 2 8 1 8 1 plimitpl 152 703 0 686 1 0 1 1 0 8 0 sigapl 424 3264 0 3207 9 1 8 9 0 8 0 knotepl 120 752 0 0 23 0 23 23 0 8 0 kqueuepl 224 1171 0 1161 12 7 5 5 0 8 4 pipepl 344 543 0 516 13 8 5 9 0 8 2 fdescpl 528 3214 0 3183 3 0 3 3 0 8 0 filepl 160 23180 0 22950 41 23 18 25 0 8 7 lockfpl 104 1389 0 1386 2 0 2 2 0 8 1 lockfspl 48 609 0 606 1 0 1 1 0 8 0 sessionpl 144 35 0 26 1 0 1 1 0 8 0 pgrppl 48 151 0 134 1 0 1 1 0 8 0 ucredpl 104 3730 0 3717 1 0 1 1 0 8 0 zombiepl 144 3720 0 3718 1 0 1 1 0 8 0 processpl 1248 3264 0 3207 6 1 5 6 0 8 0 procpl 664 8143 0 8076 10 3 7 9 0 8 0 sosppl 168 28 0 28 4 3 1 1 0 8 1 sockpl 752 6464 0 6423 81 70 11 24 0 8 6 mcl64k 65536 16 0 0 2 0 2 2 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 8 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 15 0 15 15 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 49 0 0 7 1 6 7 0 8 0 mtagpl 96 23 0 0 1 0 1 1 0 8 0 mbufpl 256 413 0 0 24 0 24 24 0 8 0 bufpl 280 31052 0 24908 440 0 440 440 0 8 0 anonpl 32 12720 0 0 104 1 103 103 0 246 0 amapchunkpl 152 97630 0 97058 59 23 36 38 0 158 8 amappl16 200 11364 0 11288 57 38 19 25 0 8 8 amappl15 192 9 0 9 3 3 0 1 0 8 0 amappl14 184 140 0 128 1 0 1 1 0 8 0 amappl13 176 51 0 51 2 2 0 1 0 8 0 amappl12 168 3927 0 3897 3 1 2 2 0 8 0 amappl11 160 65 0 50 1 0 1 1 0 8 0 amappl10 152 7 0 7 2 1 1 1 0 8 1 amappl9 144 252 0 252 1 1 0 1 0 8 0 amappl8 136 58 0 55 1 0 1 1 0 8 0 amappl7 128 124 0 111 1 0 1 1 0 8 0 amappl6 120 246 0 241 1 0 1 1 0 8 0 amappl5 112 140 0 130 1 0 1 1 0 8 0 amappl4 104 351 0 331 1 0 1 1 0 8 0 amappl3 96 20425 0 20312 5 1 4 4 0 8 0 amappl2 88 778 0 715 2 0 2 2 0 8 0 amappl1 80 21972 0 21381 15 1 14 14 0 8 0 amappl 88 27505 0 27328 5 0 5 5 0 92 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma1024 1024 3 0 2 1 0 1 1 0 8 0 dma256 256 10 0 10 4 4 0 1 0 8 0 dma128 128 255 0 255 2 2 0 1 0 8 0 dma64 64 8 0 8 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 44 0 3 1 0 1 1 0 8 0 uaddrrnd 24 3214 0 3183 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3214 0 3183 1 0 1 1 0 8 0 vmmpekpl 168 26480 0 26435 3 0 3 3 0 8 0 vmmpepl 168 208322 0 206265 136 27 109 111 0 357 10 vmsppl 488 3213 0 3183 7 2 5 5 0 8 0 rwobjpl 80 59772 0 52806 152 1 151 151 0 8 4 pdppl 4096 6436 0 6366 122 50 72 86 0 8 2 pvpl 32 22415 0 0 180 0 180 180 0 265 0 pmappl 256 3213 0 3183 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 356 0 99 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8378fff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff8389d448) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8389d448) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 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(ffffffff8389d448) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8389d448) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80002a411f40,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x78c4e4fc0260, count: 4 ddb{0}> trace x86_ipi_db(ffffffff8378fff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff8389d448) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8389d448) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 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(ffffffff8389d448) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8389d448) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80002a411f40,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x78c4e4fc0260, count: -11 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x78c4e4fc0440, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x78c4e4fc0440, count: -1