uvm_fault(0xfffffd806c7a0b90, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff8297b718 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002a2f9f10 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff8297b718 Starting stack trace... panic(ffffffff833e2462) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a2f9e60) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001611000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,81,2000,ffff80003c436a88) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003c436a88) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80002a2fa010) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80611712a0,81,fffffd80097fd5b0,ffff80003c436a88) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8060d65970,ffff80003c436a88) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8060d65970,ffff80003c436a88) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8060d65970,ffff80003c436a88) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8060d65970,ffff80003c436a88) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c436a88) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c436a88,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c436a88,ffff80002a2fa380,ffff80002a2fa2d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a2fa380) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2fa380) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75ee3d957550, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 6 3 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 37834 53847 0 0 0 0 syz-executor *225409 84444 0 0 0x4000000 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0xcf6b2c29680, 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(0xfffffd806c7a0b90, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xcf6b2c29680, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c447e40 rbx 0 rdx 0 rcx 0xffff80003c436fb8 rax 0x31 r8 0xffff80003c447d70 r9 0x1 r10 0xb16e06a5a1e056f8 r11 0x7d553da07ed9b0ef r12 0 r13 0 r14 0xffff80003c436fb8 r15 0 rip 0xffffffff829763ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c447dc0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=225409 pid=84444 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c437250,0xffff80003c437790 process=0xffff8000fffe5360 user=0xffff80003c442000, vmspace=0xfffffd806c7a05d8 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 53847 37834 2480 0 7 0 syz-executor 53847 54811 2480 0 2 0x4000000 syz-executor 84444 116963 16216 0 2 0 syz-executor 84444 451803 16216 0 3 0x4000080 fsleep syz-executor 84444 466451 16216 0 3 0x4000080 fsleep syz-executor *84444 225409 16216 0 7 0x4000000 syz-executor 41658 145267 34982 0 2 0 syz-executor 41658 462628 34982 0 3 0x4000080 fsleep syz-executor 77810 450607 59778 0 2 0 syz-executor 77810 423178 59778 0 3 0x4000080 fsleep syz-executor 3029 19095 8357 0 2 0 syz-executor 3029 437649 8357 0 3 0x4000080 fsleep syz-executor 8357 181260 44272 0 3 0x82 nanoslp syz-executor 2480 308725 44272 0 3 0x82 nanoslp syz-executor 48412 517382 0 0 3 0x14200 acct acct 16216 169694 44272 0 3 0x82 nanoslp syz-executor 36278 116376 1 0 3 0x100083 ttyopn getty 58216 290590 44272 0 2 0x2 syz-executor 20423 475143 44272 0 3 0x82 wait syz-executor 72302 499096 44272 0 3 0x82 wait syz-executor 59778 23461 44272 0 3 0x82 nanoslp syz-executor 34982 273159 44272 0 3 0x82 nanoslp syz-executor 44272 122079 98636 0 3 0x82 kqread syz-executor 98636 493547 14315 0 3 0x10008a sigsusp ksh 14315 174151 87858 0 3 0x98 kqread sshd-session 87858 128536 93833 0 3 0x92 kqread sshd-session 93833 364697 1 0 3 0x88 kqread sshd 33416 333743 34334 74 3 0x1100092 bpf pflogd 34334 157885 1 0 3 0x80 sbwait pflogd 93970 52142 68341 73 3 0x1100090 kqread syslogd 68341 216075 1 0 3 0x100082 sbwait syslogd 45705 22156 1 0 3 0x100080 kqread resolvd 27907 87423 19505 77 3 0x100092 kqread dhcpleased 40406 326004 19505 77 3 0x100092 kqread dhcpleased 19505 51063 1 0 3 0x80 kqread dhcpleased 32306 420640 0 0 3 0x14200 bored smr 39412 8319 0 0 2 0x14200 zerothread 20186 440969 0 0 3 0x14200 aiodoned aiodoned 28364 339438 0 0 3 0x14200 syncer update 47521 390952 0 0 3 0x14200 cleaner cleaner 48323 407000 0 0 3 0x14200 reaper reaper 19850 344318 0 0 3 0x14200 pgdaemon pagedaemon 50651 459090 0 0 3 0x14200 bored viomb 18752 116770 0 0 3 0x40014200 acpi0 acpi0 40893 165383 0 0 3 0x40014200 idle1 16793 405251 0 0 3 0x14200 bored softnet1 94839 388101 0 0 3 0x14200 netlock softnet0 41504 106568 0 0 2 0x40014200 systqmp 65405 398956 0 0 3 0x14200 bored systq 84249 66167 0 0 3 0x14200 tmoslp softclockmp 83596 284298 0 0 3 0x40014200 tmoslp softclock 67674 11402 0 0 3 0x40014200 idle0 1 437221 0 0 3 0x80082 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 11090 12207K 12425K 166960K 13406 0 pcb 18 13K 14K 166960K 333 0 rtable 215 10K 10K 166960K 796 0 pf 37 18K 82K 166960K 212 0 ifaddr 38 7K 8K 166960K 153 0 ifgroup 55 2K 3K 166960K 263 0 sysctl 4 1K 9K 166960K 53 0 counters 70 37K 38K 166960K 408 0 ioctlops 0 0K 4K 166960K 1872 0 iov 0 0K 24K 166960K 131 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1384 87K 88K 166960K 2611 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 124 0 dirhash 15 2K 3K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 236K 166960K 1719 0 sigio 1 0K 0K 166960K 37 0 proc 73 131K 164K 166960K 812 0 subproc 72 4K 4K 166960K 118 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 181 0 in_multi 79 5K 7K 166960K 203 0 ether_multi 1 0K 0K 166960K 15 0 mrt 0 0K 0K 166960K 30 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 762 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 1K 166960K 5 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 254 153K 168K 166960K 17511 0 UVM aobj 22 16K 16K 166960K 24 0 pinsyscall 43 86K 105K 166960K 3000 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 0K 166960K 184 0 NDP 12 0K 2K 166960K 106 0 temp 79 8688K 9008K 166960K 73135 0 kqueue 14 22K 32K 166960K 356 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 120 166 0 163 1 0 1 1 0 8 0 rtentry 176 236 0 152 6 1 5 6 0 8 0 unpcb 144 1429 0 1377 13 11 2 6 0 8 0 syncache 336 7 0 7 3 2 1 1 0 8 1 tcpqe 32 4 0 4 1 0 1 1 0 8 1 tcpcb 736 463 0 455 8 6 2 7 0 8 1 arp 136 37 0 23 1 0 1 1 0 8 0 inpcb 328 1706 0 1693 15 13 2 7 0 8 0 nd6 152 43 0 23 2 0 2 2 0 8 0 pkpcb 40 21 0 21 3 2 1 1 0 8 1 kcovpl 48 13 0 5 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 141 0 141 2 1 1 1 0 8 1 pppxif 1504 80 0 80 4 3 1 1 0 8 1 pffrag 232 8 0 2 1 0 1 1 0 482 0 pffrnode 88 8 0 2 1 0 1 1 0 8 0 pffrent 40 21 0 14 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 2 0 2 2 2 0 1 0 8 0 pfstitem 24 4 0 0 1 0 1 1 0 8 0 pfstkey 128 4 0 0 1 0 1 1 0 8 0 pfstate 448 2 0 0 1 0 1 1 0 8 0 pfrule 1360 2 0 1 1 0 1 1 0 8 0 rttmr 136 8 0 8 3 2 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 962 0 588 35 9 26 31 0 8 1 art_table 40 965 0 588 5 0 5 5 0 8 0 art_node 32 232 0 161 1 0 1 1 0 8 0 sysvmsgpl 40 20 0 8 1 0 1 1 0 8 0 semupl 112 4 0 4 2 2 0 1 0 8 0 semapl 112 119 0 109 1 0 1 1 0 8 0 shmpl 112 14 0 1 1 0 1 1 0 8 0 dirhash 1024 25 0 6 3 0 3 3 0 8 0 dino2pl 256 4671 0 3152 96 0 96 96 0 8 0 ffsino 296 4671 0 3152 118 0 118 118 0 8 0 nchpl 144 6968 0 5251 64 0 64 64 0 8 0 rtmask 32 11 0 11 3 2 1 1 0 8 1 vnodes 216 5222 0 0 291 0 291 291 0 8 0 namei 1024 24853 0 24853 3 2 1 2 0 8 1 percpumem 16 219 0 169 1 0 1 1 0 8 0 vcpupl 3968 6 0 0 1 0 1 1 0 8 0 vmpool 848 7 0 1 1 0 1 1 0 8 0 kstatmem 264 162 0 134 6 3 3 3 0 8 1 scsiplug 72 12 0 12 2 1 1 1 0 8 1 scxspl 216 33125 0 33125 17 13 4 8 1 8 4 plimitpl 152 525 0 508 1 0 1 1 0 8 0 sigapl 424 2034 0 1985 9 3 6 8 0 8 0 knotepl 120 766 0 0 24 0 24 24 0 8 0 kqueuepl 224 777 0 767 11 6 5 5 0 8 4 pipepl 344 281 0 251 3 0 3 3 0 8 0 fdescpl 528 1994 0 1962 3 0 3 3 0 8 0 filepl 160 13761 0 13498 25 10 15 18 0 8 2 lockfpl 104 533 0 531 1 0 1 1 0 8 0 lockfspl 48 212 0 210 1 0 1 1 0 8 0 sessionpl 144 30 0 21 1 0 1 1 0 8 0 pgrppl 48 75 0 58 1 0 1 1 0 8 0 ucredpl 104 2270 0 2256 1 0 1 1 0 8 0 zombiepl 144 1988 0 1985 1 0 1 1 0 8 0 processpl 1232 2034 0 1985 6 0 6 6 0 8 1 procpl 664 4705 0 4649 7 0 7 7 0 8 0 sosppl 176 6 0 6 3 3 0 1 0 8 0 sockpl 752 3362 0 3294 36 29 7 20 0 8 0 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 9 0 0 2 0 2 2 0 8 0 mcl4k 4096 133 0 0 17 0 17 17 0 8 0 mcl2k 2048 27 0 0 4 0 4 4 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1207 0 0 75 0 75 75 0 8 0 bufpl 280 12133 0 5997 439 0 439 439 0 8 0 anonpl 32 12336 0 0 100 0 100 100 0 246 0 amapchunkpl 152 58800 0 58284 37 6 31 32 0 158 10 amappl16 200 6017 0 5985 50 37 13 29 0 8 8 amappl15 192 9 0 9 1 1 0 1 0 8 0 amappl14 184 2 0 2 1 1 0 1 0 8 0 amappl13 176 494 0 493 1 0 1 1 0 8 0 amappl12 168 2397 0 2354 3 0 3 3 0 8 0 amappl11 160 2 0 2 1 1 0 1 0 8 0 amappl10 152 48 0 34 1 0 1 1 0 8 0 amappl9 144 254 0 254 1 1 0 1 0 8 0 amappl8 136 26 0 24 1 0 1 1 0 8 0 amappl7 128 104 0 102 1 0 1 1 0 8 0 amappl6 120 339 0 325 1 0 1 1 0 8 0 amappl5 112 81 0 69 1 0 1 1 0 8 0 amappl4 104 467 0 437 1 0 1 1 0 8 0 amappl3 96 10410 0 10312 4 1 3 3 0 8 0 amappl2 88 2121 0 2040 2 0 2 2 0 8 0 amappl1 80 16477 0 15892 15 1 14 14 0 8 0 amappl 88 16432 0 16256 5 0 5 5 0 92 0 uvmvnodes 80 154 0 0 4 0 4 4 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 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 128 260 0 260 4 3 1 1 0 8 1 dma64 64 50 0 50 2 2 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 23 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1994 0 1962 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1994 0 1962 1 0 1 1 0 8 0 vmmpekpl 168 16822 0 16761 4 1 3 3 0 8 0 vmmpepl 168 129819 0 127848 124 12 112 114 0 357 16 vmsppl 488 1993 0 1962 5 0 5 5 0 8 0 rwobjpl 80 35418 0 34314 37 3 34 35 0 8 2 pdppl 4096 4009 0 3932 124 47 77 85 0 8 0 pvpl 32 20188 0 0 163 0 163 163 0 265 0 pmappl 256 2000 0 1963 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 385 0 70 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83839ff0) 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(ffffffff83960e00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83960e00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsofttty() at Xsofttty+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:153 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7f6ffd9711e0, count: 4 ddb{0}> trace x86_ipi_db(ffffffff83839ff0) 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(ffffffff83960e00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83960e00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsofttty() at Xsofttty+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:153 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7f6ffd9711e0, 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: 0xcf6b2c29680, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xcf6b2c29680, count: -1