+ -uvm_fault(0xfffffd806b8bcb88, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff8190e738 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80003c4038a0 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff8190e738 Starting stack trace... panic(ffffffff833a4fb8) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c4037f0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001590000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80002a33c2c8) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80002a33c2c8) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c4039a0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd800e2b8490,81,fffffd80097fb6e8,ffff80002a33c2c8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b760860,ffff80002a33c2c8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b760860,ffff80002a33c2c8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b760860,ffff80002a33c2c8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b760860,ffff80002a33c2c8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a33c2c8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a33c2c8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a33c2c8,ffff80003c403d10,ffff80003c403c60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c403d10) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c403d10) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c6054711310, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 1416696568 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 466822 12623 0 0 0x4000000 0 syz-executor *315281 33899 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7c60547112e0, 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(0xfffffd806b8bcb88, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7c60547112e0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a2fef80 rbx 0 rdx 0 rcx 0xffff8000ffffd230 rax 0x3b r8 0xffff80002a2feeb0 r9 0x1 r10 0x16b1606e70737248 r11 0x13833f44b9e76871 r12 0 r13 0 r14 0xffff8000ffffd230 r15 0 rip 0xffffffff81a233ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a2fef00 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=315281 pid=33899 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=0xffff80002a272a70,0xffff8000ffffcd10 process=0xffff8000ffff2690 user=0xffff80002a2f9000, vmspace=0xfffffd806e3ba7b0 estcpu=36, cpticks=373, pctcpu=0.30, user=6, sys=360, intr=6 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 21510 467869 77308 0 2 0 syz-executor 21510 221950 77308 0 3 0x4000080 semwait syz-executor 3209 426944 12872 0 2 0 syz-executor 3209 280365 12872 0 3 0x4000080 fsleep syz-executor 3209 97676 12872 0 3 0x4000080 fsleep syz-executor 12623 292925 86857 0 3 0x80 nanoslp syz-executor 12623 466822 86857 0 7 0x4000000 syz-executor 12623 361251 86857 0 3 0x4000080 fsleep syz-executor 12623 7973 86857 0 3 0x4000080 fsleep syz-executor 12623 392235 86857 0 3 0x4000000 inode syz-executor 12623 151919 86857 0 3 0x4000080 fsleep syz-executor 91422 279978 5827 0 3 0x3000 suspend syz-executor 91422 387329 5827 0 3 0x4081000 biowait syz-executor 91422 167242 5827 0 3 0x4081000 inode syz-executor 12872 27213 77578 0 3 0x82 nanoslp syz-executor 10740 338273 0 0 3 0x14200 acct acct 77308 406453 77578 0 3 0x82 nanoslp syz-executor 44326 421979 77578 0 3 0x82 wait syz-executor 4059 300423 77578 0 3 0x82 wait syz-executor 5827 289143 77578 0 3 0x82 nanoslp syz-executor 74913 187624 1 0 3 0x100083 ttyopn getty 76132 391077 77578 0 3 0x82 nanoslp syz-executor 17528 130721 0 0 3 0x14200 bored sosplice 86857 359678 77578 0 3 0x82 nanoslp syz-executor *33899 315281 77578 0 7 0x2 syz-executor 77578 72830 29396 0 3 0x82 kqread syz-executor 29396 363583 46753 0 3 0x10008a sigsusp ksh 46753 18716 56326 0 3 0x98 kqread sshd-session 56326 179388 61518 0 3 0x92 kqread sshd-session 61518 146395 1 0 3 0x88 kqread sshd 33607 326972 40594 74 3 0x1100092 bpf pflogd 40594 52143 1 0 3 0x80 sbwait pflogd 31310 200518 70178 73 3 0x1100090 kqread syslogd 70178 28915 1 0 3 0x100082 sbwait syslogd 45614 245914 1 0 3 0x100080 kqread resolvd 32653 303679 34795 77 3 0x100092 kqread dhcpleased 61457 456587 34795 77 3 0x100092 kqread dhcpleased 34795 469145 1 0 3 0x80 kqread dhcpleased 31610 235730 0 0 3 0x14200 bored smr 2776 98580 0 0 3 0x14200 pgzero zerothread 67995 329280 0 0 3 0x14200 aiodoned aiodoned 17897 218694 0 0 3 0x14200 syncer update 60144 128694 0 0 3 0x14200 cleaner cleaner 65437 462027 0 0 3 0x14200 reaper reaper 18078 452777 0 0 3 0x14200 pgdaemon pagedaemon 90634 152582 0 0 3 0x14200 bored viomb 17625 389889 0 0 3 0x40014200 acpi0 acpi0 73467 331468 0 0 3 0x40014200 idle1 4711 73276 0 0 3 0x14200 bored softnet1 90503 109217 0 0 3 0x14200 netlock softnet0 59062 337483 0 0 2 0x40014200 systqmp 21827 468225 0 0 3 0x14200 bored systq 18716 257842 0 0 3 0x14200 tmoslp softclockmp 28288 267740 0 0 3 0x40014200 tmoslp softclock 31964 522314 0 0 3 0x40014200 idle0 1 201557 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 12623 (syz-executor) thread 0xffff80003c40f780 (466822) Process 12623 (syz-executor) thread 0xffff80002a33d258 (392235) Process 91422 (syz-executor) thread 0xffff80002a33c560 (387329) Process 91422 (syz-executor) thread 0xffff80002a33d788 (167242) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10223 11085K 12417K 166960K 17065 0 pcb 18 15K 17K 166960K 934 0 rtable 177 13K 14K 166960K 1150 0 pf 33 17K 67486K 166960K 340 0 ifaddr 31 6K 8K 166960K 241 0 ifgroup 47 2K 3K 166960K 392 0 sysctl 4 1K 9K 166960K 32 0 counters 64 36K 38K 166960K 442 0 ioctlops 0 0K 4K 166960K 2273 0 iov 0 0K 24K 166960K 325 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1518 95K 96K 166960K 5155 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 616K 620K 166960K 60 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 268 0 dirhash 12 2K 2K 166960K 93 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 3889 0 sigio 0 0K 0K 166960K 73 0 proc 72 115K 164K 166960K 1311 0 subproc 72 4K 4K 166960K 189 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 598 0 in_multi 55 4K 7K 166960K 381 0 ether_multi 1 0K 0K 166960K 37 0 mrt 1 0K 0K 166960K 28 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 139 625K 625K 166960K 139 0 exec 0 0K 1K 166960K 1511 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 9 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 275 163K 179K 166960K 36077 0 UVM aobj 18 2K 2K 166960K 21 0 pinsyscall 43 86K 102K 166960K 5294 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 186 0 NDP 10 0K 1K 166960K 176 0 temp 84 8656K 8912K 166960K 212821 0 kqueue 14 22K 32K 166960K 758 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 120 514 0 511 6 5 1 3 0 8 0 rtentry 176 435 0 379 5 0 5 5 0 8 0 unpcb 144 2622 0 2605 16 12 4 6 0 8 3 syncache 336 14 0 14 6 5 1 1 0 8 1 tcpqe 32 3 0 3 2 2 0 1 0 8 0 tcpcb 736 1375 0 1366 23 16 7 7 0 8 5 arp 136 96 0 89 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 3 0 3 1 1 0 1 0 8 0 inpcb 328 4360 0 4342 37 27 10 15 0 8 8 nd6 152 58 0 48 1 0 1 1 0 8 0 pkpcb 40 30 0 30 5 4 1 1 0 8 1 kcovpl 48 21 0 13 1 0 1 1 0 8 0 mppekey 1024 4 0 4 2 2 0 1 0 8 0 ppxss 1192 150 0 150 5 4 1 1 0 8 1 pppxif 1504 16 0 16 3 3 0 1 0 8 0 pfstscr 40 1 0 0 1 0 1 1 0 8 0 pffrag 232 24 0 12 1 0 1 1 0 482 0 pffrnode 88 19 0 8 1 0 1 1 0 8 0 pffrent 40 68 0 56 1 0 1 1 0 8 0 pfosfp 40 1430 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1430 0 714 21 0 21 21 0 8 0 pfrktable 1344 2 0 2 2 2 0 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pfstitem 24 190 0 77 1 0 1 1 0 8 0 pfstkey 128 190 0 77 4 0 4 4 0 8 0 pfstate 384 189 0 77 12 0 12 12 0 8 0 pfrule 1344 25 0 19 2 1 1 2 0 8 0 rttmr 136 7 0 7 4 4 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 1598 0 1351 37 10 27 28 0 8 5 art_table 40 1602 0 1351 5 0 5 5 0 8 0 art_node 32 430 0 385 2 0 2 2 0 8 0 sysvmsgpl 40 5 0 2 1 0 1 1 0 8 0 semupl 112 5 0 5 5 5 0 1 0 8 0 semapl 112 260 0 250 1 0 1 1 0 8 0 shmpl 112 18 0 3 1 0 1 1 0 8 0 dirhash 1024 72 0 55 3 0 3 3 0 8 0 dino2pl 256 8655 0 7114 99 2 97 97 0 8 0 ffsino 296 8655 0 7114 119 0 119 119 0 8 0 nchpl 144 13819 0 12088 65 0 65 65 0 8 0 rtmask 32 31 0 31 6 5 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 50729 0 50727 3 2 1 2 0 8 0 percpumem 16 236 0 189 1 0 1 1 0 8 0 kstatmem 264 268 0 244 3 0 3 3 0 8 0 scsiplug 72 23 0 23 5 5 0 1 0 8 0 scxspl 216 88643 0 88641 16 14 2 8 1 8 1 plimitpl 152 1007 0 988 1 0 1 1 0 8 0 sigapl 424 4141 0 4091 9 2 7 8 0 8 0 knotepl 120 594 0 0 17 0 17 17 0 8 0 kqueuepl 224 1527 0 1517 13 11 2 5 0 8 1 pipepl 344 662 0 634 19 16 3 9 0 8 0 fdescpl 528 4094 0 4062 3 0 3 3 0 8 0 filepl 160 29088 0 28852 31 13 18 18 0 8 4 lockfpl 104 2788 0 2786 5 3 2 2 0 8 1 lockfspl 48 886 0 884 1 0 1 1 0 8 0 sessionpl 144 45 0 36 1 0 1 1 0 8 0 pgrppl 48 139 0 122 1 0 1 1 0 8 0 ucredpl 104 4727 0 4712 1 0 1 1 0 8 0 zombiepl 144 4125 0 4120 1 0 1 1 0 8 0 processpl 1232 4141 0 4091 6 1 5 6 0 8 0 procpl 664 10299 0 10239 8 0 8 8 0 8 0 sosppl 168 23 0 23 5 4 1 1 0 8 1 sockpl 752 7663 0 7624 53 41 12 20 0 8 8 mcl64k 65536 19 0 0 3 0 3 3 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 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 105 0 0 14 0 14 14 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 90 0 0 10 0 10 10 0 8 0 mtagpl 96 40 0 0 1 0 1 1 0 8 0 mbufpl 256 3530 0 0 217 0 217 217 0 8 0 bufpl 280 39137 0 32994 441 1 440 440 0 8 0 anonpl 32 14919 0 0 120 0 120 120 0 246 0 amapchunkpl 152 125880 0 125140 57 22 35 35 0 158 6 amappl16 200 13290 0 12945 79 60 19 34 0 8 0 amappl15 192 8 0 8 2 2 0 1 0 8 0 amappl14 184 195 0 183 1 0 1 1 0 8 0 amappl13 176 8 0 8 1 1 0 1 0 8 0 amappl12 168 4949 0 4917 4 2 2 3 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 8 0 8 1 1 0 1 0 8 0 amappl9 144 254 0 254 1 1 0 1 0 8 0 amappl8 136 22 0 19 1 0 1 1 0 8 0 amappl7 128 153 0 140 1 0 1 1 0 8 0 amappl6 120 315 0 311 1 0 1 1 0 8 0 amappl5 112 176 0 166 1 0 1 1 0 8 0 amappl4 104 337 0 316 1 0 1 1 0 8 0 amappl3 96 22379 0 22265 5 2 3 4 0 8 0 amappl2 88 4423 0 4340 3 0 3 3 0 8 1 amappl1 80 25787 0 25177 17 1 16 16 0 8 0 amappl 88 34515 0 34314 5 0 5 5 0 92 0 dma16384 16384 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 dma512 512 2 0 2 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 259 0 259 4 4 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 20 0 3 1 0 1 1 0 8 0 uaddrrnd 24 4094 0 4062 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4094 0 4062 1 0 1 1 0 8 0 vmmpekpl 168 30951 0 30886 4 0 4 4 0 8 0 vmmpepl 168 258782 0 256356 132 23 109 118 0 357 2 vmsppl 488 4093 0 4062 7 2 5 5 0 8 0 rwobjpl 80 71094 0 63844 158 8 150 154 0 8 2 pdppl 4096 8196 0 8124 124 52 72 86 0 8 0 pvpl 32 23420 0 0 190 2 188 189 0 265 0 pmappl 256 4093 0 4062 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 555 0 93 14 0 14 14 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837efff0) 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+0x39 sys/dev/kcov.c:159 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(ffffffff83915db8) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83915db8) at __mp_lock+0x199 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff83915db8,1) 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 biowait(fffffd8062410e58) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd8062410e58) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ffs_write(ffff80002a376410) at ffs_write+0x810 sys/ufs/ffs/ffs_vnops.c:377 VOP_WRITE(fffffd805dfd07f0,ffff80002a3765c8,7,fffffd80097fb6e8) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 end trace frame: 0xffff80002a376500, count: 0 ddb{0}> trace x86_ipi_db(ffffffff837efff0) 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+0x39 sys/dev/kcov.c:159 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(ffffffff83915db8) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83915db8) at __mp_lock+0x199 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff83915db8,1) 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 biowait(fffffd8062410e58) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd8062410e58) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ffs_write(ffff80002a376410) at ffs_write+0x810 sys/ufs/ffs/ffs_vnops.c:377 VOP_WRITE(fffffd805dfd07f0,ffff80002a3765c8,7,fffffd80097fb6e8) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd806b7609a0,ffff80002a3765c8,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80003c40f780,4,ffff80002a3765c8,0,ffff80002a376680) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_write(ffff80003c40f780,ffff80002a376730,ffff80002a376680) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80002a376730) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a376730) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1c815bd80c0, count: -19 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7c60547112e0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7c60547112e0, count: -1