uvm_fault(0xfffffd806b9b13e8, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff8235d998 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80003c451880 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff8235d998 Starting stack trace... panic(ffffffff833a2d08) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c4517d0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001471000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,1,2000,ffff80002a2e2fb0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,1,2000,ffff80002a2e2fb0) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c451980) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805b9b15f0,1,fffffd80097fb680,ffff80002a2e2fb0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8065db2748,ffff80002a2e2fb0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8065db2748,ffff80002a2e2fb0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8065db2748,ffff80002a2e2fb0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8065db2748,ffff80002a2e2fb0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a2e2fb0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a2e2fb0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a2e2fb0,ffff80003c451cf0,ffff80003c451c40) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c451cf0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c451cf0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f18dcfae6e0, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 2130175624 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 352238 28828 0 0 0x4000000 0 syz-executor *120378 87707 60929 0x10 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x75977ef7e670, 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(0xfffffd806b9b13e8, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x75977ef7e670, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c441040 rbx 0 rdx 0 rcx 0xffff8000ffff3238 rax 0x3b r8 0xffff80003c440f70 r9 0x1 r10 0xf706499f694e6c95 r11 0xa0058bbb95e64796 r12 0 r13 0 r14 0xffff8000ffff3238 r15 0 rip 0xffffffff81c243ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c440fc0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=120378 pid=87707 tcnt=3 stat=onproc flags process=10 proc=0 runpri=86, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002effafc0,0xffff80002a2e3258 process=0xffff80002a29c018 user=0xffff80003c43c000, vmspace=0xfffffd806b9b1018 estcpu=36, cpticks=3, pctcpu=0.0, user=1, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 28828 228197 67303 0 2 0 syz-executor 28828 352238 67303 0 7 0x4000000 syz-executor 36773 47233 32402 0 2 0x10 syz-executor 36773 347291 32402 0 3 0x4000090 bell syz-executor 19278 44813 3409 0 2 0 syz-executor 19278 247172 3409 0 2 0x4000000 syz-executor 21463 283204 8052 0 2 0 syz-executor 21463 333662 8052 0 3 0x4000080 fsleep syz-executor 21463 370379 8052 0 2 0x4000000 syz-executor *87707 120378 96875 60929 7 0x10 syz-executor 87707 34365 96875 60929 3 0x4000090 kqsel syz-executor 87707 462390 96875 60929 3 0x4000090 fsleep syz-executor 3409 348920 52581 0 3 0x82 nanoslp syz-executor 2028 227343 7270 0 3 0x80 nanoslp syz-executor 2028 41994 7270 0 3 0x4000080 piperd syz-executor 2028 400139 7270 0 3 0x4000080 fsleep syz-executor 41209 245224 0 0 3 0x14200 acct acct 96875 313980 52581 0 3 0x82 nanoslp syz-executor 30348 428816 1 0 3 0x100083 ttyin getty 67303 390393 52581 0 3 0x82 nanoslp syz-executor 8052 409035 52581 0 3 0x82 nanoslp syz-executor 77133 71833 0 0 3 0x14200 bored sosplice 7270 512440 52581 0 3 0x82 nanoslp syz-executor 59887 502003 52581 0 3 0x82 nanoslp syz-executor 1513 67124 52581 0 3 0x82 nanoslp syz-executor 32402 275576 52581 0 3 0x82 nanoslp syz-executor 52581 500513 17863 0 3 0x82 kqread syz-executor 17863 409234 55005 0 3 0x10008a sigsusp ksh 55005 94946 26883 0 3 0x98 kqread sshd-session 26883 363547 76282 0 3 0x92 kqread sshd-session 76282 71025 1 0 3 0x88 kqread sshd 35324 79761 63622 74 3 0x1100092 bpf pflogd 63622 25027 1 0 3 0x80 sbwait pflogd 69350 36364 95664 73 3 0x1100090 kqread syslogd 95664 88320 1 0 3 0x100082 sbwait syslogd 6629 356508 1 0 3 0x100080 kqread resolvd 54810 300201 75479 77 3 0x100092 kqread dhcpleased 89253 216815 75479 77 3 0x100092 kqread dhcpleased 75479 523571 1 0 3 0x80 kqread dhcpleased 81358 151054 0 0 3 0x14200 pause smr 18391 456988 0 0 2 0x14200 zerothread 73914 97111 0 0 3 0x14200 aiodoned aiodoned 24691 518981 0 0 3 0x14200 syncer update 69715 30173 0 0 3 0x14200 cleaner cleaner 84062 445387 0 0 3 0x14200 reaper reaper 18492 251919 0 0 3 0x14200 pgdaemon pagedaemon 19929 449781 0 0 3 0x14200 bored viomb 1096 244014 0 0 3 0x40014200 acpi0 acpi0 86781 209181 0 0 3 0x40014200 idle1 19177 371446 0 0 3 0x14200 bored softnet7 40528 236069 0 0 3 0x14200 bored softnet6 96973 318825 0 0 3 0x14200 bored softnet5 79647 263477 0 0 3 0x14200 bored softnet4 41285 211546 0 0 3 0x14200 bored softnet3 9310 180667 0 0 3 0x14200 bored softnet2 9385 332023 0 0 3 0x14200 bored softnet1 62208 496095 0 0 2 0x14200 softnet0 36602 163296 0 0 2 0x40014200 systqmp 58555 421634 0 0 3 0x14200 bored systq 32747 207074 0 0 3 0x14200 tmoslp softclockmp 81848 315171 0 0 3 0x40014200 tmoslp softclock 70920 132047 0 0 3 0x40014200 idle0 1 518244 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 28828 (syz-executor) thread 0xffff80002a2e2d18 (352238) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10249 11272K 12000K 166960K 13645 0 pcb 17 14K 16K 166960K 308 0 rtable 205 10K 10K 166960K 523 0 pf 43 19K 82K 166960K 190 0 ifaddr 43 7K 7K 166960K 132 0 ifgroup 65 2K 2K 166960K 204 0 sysctl 3 1K 9K 166960K 77 0 counters 74 37K 38K 166960K 550 0 ioctlops 0 0K 4K 166960K 2051 0 iov 0 0K 32K 166960K 115 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1462 92K 92K 166960K 2863 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 10K 14K 166960K 20 0 VM map 2 1K 1K 166960K 2 0 sem 12 16K 16K 166960K 46 0 dirhash 12 2K 2K 166960K 33 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 1571 0 sigio 0 0K 0K 166960K 64 0 proc 72 115K 164K 166960K 776 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 462 0 in_multi 84 6K 7K 166960K 208 0 ether_multi 1 0K 0K 166960K 12 0 mrt 4 0K 0K 166960K 11 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 654 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 264 161K 182K 166960K 16086 0 UVM aobj 27 3K 3K 166960K 33 0 pinsyscall 43 86K 100K 166960K 2773 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 1K 166960K 105 0 NDP 17 0K 2K 166960K 90 0 temp 80 8652K 8906K 166960K 75027 0 kqueue 14 22K 32K 166960K 298 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 120 137 0 134 1 0 1 1 0 8 0 rtentry 176 173 0 97 5 0 5 5 0 8 0 unpcb 144 1457 0 1310 14 8 6 6 0 8 0 syncache 336 13 0 13 4 3 1 1 0 8 1 tcpqe 32 2 0 2 2 1 1 1 0 8 1 tcpcb 736 526 0 454 13 6 7 7 0 8 0 arp 128 20 0 9 1 0 1 1 0 8 0 inpcb 328 1667 0 1591 18 11 7 7 0 8 0 nd6 144 31 0 17 1 0 1 1 0 8 0 pkpcb 40 78 0 78 3 3 0 1 0 8 0 kcovpl 48 12 0 4 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 224 0 223 3 2 1 1 0 8 0 pppxif 1504 74 0 74 3 3 0 1 0 8 0 pfstscr 40 4 0 3 1 0 1 1 0 8 0 pffrag 232 13 0 4 1 0 1 1 0 482 0 pffrnode 88 13 0 4 1 0 1 1 0 8 0 pffrent 40 21 0 12 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 1 0 1 1 1 0 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 113 0 31 1 0 1 1 0 8 0 pfstkey 128 116 0 34 3 0 3 3 0 8 0 pfstate 384 116 0 34 9 0 9 9 0 8 0 pfrule 1344 23 0 17 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 869 0 500 31 7 24 28 0 8 0 art_table 40 872 0 500 5 0 5 5 0 8 0 art_node 32 171 0 104 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 7 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 41 0 31 1 0 1 1 0 8 0 shmpl 112 30 0 6 1 0 1 1 0 8 0 dirhash 1024 31 0 14 3 0 3 3 0 8 0 dino2pl 256 4252 0 2733 96 0 96 96 0 8 0 ffsino 296 4252 0 2733 119 2 117 118 0 8 0 nchpl 144 6355 0 4646 64 0 64 64 0 8 0 rtmask 32 9 0 9 2 2 0 1 0 8 0 uvmvnodes 80 5245 0 0 108 0 108 108 0 8 0 vnodes 216 5245 0 0 292 0 292 292 0 8 0 namei 1024 22348 0 22348 3 2 1 2 0 8 1 percpumem 16 290 0 238 1 0 1 1 0 8 0 kstatmem 264 136 0 100 4 1 3 3 0 8 0 scsiplug 72 12 0 12 3 2 1 1 0 8 1 scxspl 216 35333 0 35333 10 8 2 6 1 8 2 plimitpl 152 604 0 586 1 0 1 1 0 8 0 sigapl 424 1865 0 1809 7 0 7 7 0 8 0 knotepl 120 583 0 0 18 0 18 18 0 8 0 kqueuepl 224 570 0 558 7 5 2 5 0 8 1 pipepl 344 309 0 280 7 4 3 6 0 8 0 fdescpl 528 1837 0 1805 3 0 3 3 0 8 0 filepl 160 12018 0 11593 23 5 18 18 0 8 0 lockfpl 104 661 0 658 2 1 1 2 0 8 0 lockfspl 48 278 0 275 1 0 1 1 0 8 0 sessionpl 144 33 0 24 1 0 1 1 0 8 0 pgrppl 48 64 0 47 1 0 1 1 0 8 0 ucredpl 104 2028 0 2013 1 0 1 1 0 8 0 zombiepl 144 1811 0 1809 1 0 1 1 0 8 0 processpl 1248 1865 0 1809 5 0 5 5 0 8 0 procpl 664 4263 0 4198 7 1 6 7 0 8 0 sosppl 168 6 0 6 2 1 1 1 0 8 1 sockpl 752 3384 0 3158 41 18 23 23 0 8 0 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 26 0 0 4 0 4 4 0 8 0 mtagpl 96 34 0 0 1 0 1 1 0 8 0 mbufpl 256 1161 0 0 73 0 73 73 0 8 0 bufpl 280 14636 0 8493 439 0 439 439 0 8 0 anonpl 32 11772 0 0 95 0 95 95 0 246 0 amapchunkpl 152 53172 0 52609 39 13 26 30 0 158 3 amappl16 200 6034 0 5998 48 34 14 23 0 8 8 amappl15 192 72 0 72 2 2 0 1 0 8 0 amappl14 184 130 0 118 1 0 1 1 0 8 0 amappl13 176 34 0 33 1 0 1 1 0 8 0 amappl12 168 2549 0 2517 3 1 2 2 0 8 0 amappl11 160 67 0 53 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 1 0 1 0 8 0 amappl9 144 253 0 253 1 1 0 1 0 8 0 amappl8 136 27 0 25 1 0 1 1 0 8 0 amappl7 128 119 0 107 1 0 1 1 0 8 0 amappl6 120 222 0 219 1 0 1 1 0 8 0 amappl5 112 146 0 136 1 0 1 1 0 8 0 amappl4 104 328 0 308 1 0 1 1 0 8 0 amappl3 96 10739 0 10610 4 0 4 4 0 8 0 amappl2 88 730 0 664 2 0 2 2 0 8 0 amappl1 80 15390 0 14783 17 2 15 15 0 8 0 amappl 88 15080 0 14890 5 0 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 128 257 0 257 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 32 0 6 1 0 1 1 0 8 0 uaddrrnd 24 1837 0 1805 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1837 0 1805 1 0 1 1 0 8 0 vmmpekpl 168 15683 0 15637 3 0 3 3 0 8 0 vmmpepl 168 120292 0 118215 120 20 100 108 0 357 5 vmsppl 488 1836 0 1805 6 1 5 5 0 8 0 rwobjpl 80 37874 0 31629 128 0 128 128 0 8 0 pdppl 4096 3682 0 3610 112 38 74 82 0 8 2 pvpl 32 21211 0 0 173 1 172 172 0 265 0 pmappl 256 1836 0 1805 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 369 0 59 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837f4ff0) 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(ffffffff839041b0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839041b0) at __mp_lock+0x192 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(ffffffff839041b0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839041b0) at __mp_lock+0x192 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff839041b0,1) 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(fffffd8059cf3238) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd8059cf3238) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ffs2_balloc(fffffd806f714018,40000,4000,fffffd80097fb680,2,ffff80002a3d7578) at ffs2_balloc+0x18b4 sys/ufs/ffs/ffs_balloc.c:701 ffs_write(ffff80002a3d7600) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 end trace frame: 0xffff80002a3d7670, count: 0 ddb{0}> trace x86_ipi_db(ffffffff837f4ff0) 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(ffffffff839041b0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839041b0) at __mp_lock+0x192 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(ffffffff839041b0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839041b0) at __mp_lock+0x192 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff839041b0,1) 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(fffffd8059cf3238) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd8059cf3238) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ffs2_balloc(fffffd806f714018,40000,4000,fffffd80097fb680,2,ffff80002a3d7578) at ffs2_balloc+0x18b4 sys/ufs/ffs/ffs_balloc.c:701 ffs_write(ffff80002a3d7600) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd80753bf028,ffff80002a3d77b8,7,fffffd80097fb680) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd8075392820,ffff80002a3d77b8,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80002a2e2d18,4,ffff80002a3d77b8,0,ffff80002a3d7870) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_write(ffff80002a2e2d18,ffff80002a3d7920,ffff80002a3d7870) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80002a3d7920) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3d7920) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdc768dc0f90, count: -20 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x75977ef7e670, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x75977ef7e670, count: -1