uvm_fault(0xfffffd806b9b03e8, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81acc2e8 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff800031806b90 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81acc2e8 Starting stack trace... panic(ffffffff833a52af) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff800031806ae0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001477000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80003c46b788) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003c46b788) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff800031806c90) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd807a371560,81,fffffd80097fb340,ffff80003c46b788) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8063d30698,ffff80003c46b788) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8063d30698,ffff80003c46b788) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8063d30698,ffff80003c46b788) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8063d30698,ffff80003c46b788) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c46b788) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c46b788,b,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c46b788,ffff800031807000,ffff800031806f50) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800031807000) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800031807000) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b56c547a960, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 4 3 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *459501 24304 0 0x2 0 1 syz-executor 471665 32163 0 0x14000 0x40000200 0 softclock savectx() at savectx+0xae end of kernel end trace frame: 0x7b31eba92fc0, 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(0xfffffd806b9b03e8, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7b31eba92fc0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a2b7270 rbx 0 rdx 0 rcx 0xffff80002a2b8018 rax 0x31 r8 0xffff80002a2b71a0 r9 0x1 r10 0xa49318bffc6d82b1 r11 0x8067de7a062cb4ab r12 0 r13 0 r14 0xffff80002a2b8018 r15 0 rip 0xffffffff817e23ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a2b71f0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=459501 pid=24304 tcnt=1 stat=onproc flags process=2 proc=0 runpri=54, usrpri=54, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2b8fa8,0xffff80002a2b82c0 process=0xffff80002a2c09b8 user=0xffff80002a2b2000, vmspace=0xfffffd800b0fb998 estcpu=4, cpticks=99, pctcpu=0.49, user=4, sys=82, intr=13 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 98474 297913 80543 60929 2 0xc90 syz-executor 98474 280920 80543 60929 3 0x4000090 fifow syz-executor 98474 338524 80543 60929 3 0x4000090 fsleep syz-executor 67970 411325 24449 0 2 0 syz-executor 67970 388671 24449 0 2 0x4000000 syz-executor 67970 396679 24449 0 2 0x4000000 syz-executor 62448 428148 61001 0 3 0x3000 suspend syz-executor 62448 378815 61001 0 2 0x4081000 syz-executor 62448 200239 61001 0 2 0x4081c00 syz-executor 62448 427668 61001 0 3 0x4081000 pipecl syz-executor 97649 401606 0 0 3 0x14280 nfsidl nfsio 6250 269970 0 0 3 0x14280 nfsidl nfsio 3782 519709 0 0 3 0x14280 nfsidl nfsio 63046 46944 0 0 3 0x14280 nfsidl nfsio 59045 69949 0 0 3 0x14280 nfsidl nfsio 66912 474888 0 0 3 0x14280 nfsidl nfsio 89964 438667 0 0 3 0x14280 nfsidl nfsio 18672 222241 0 0 3 0x14280 nfsidl nfsio 66441 88320 0 0 3 0x14280 nfsidl nfsio 41922 306449 0 0 3 0x14280 nfsidl nfsio 95115 304668 0 0 3 0x14280 nfsidl nfsio 15981 496289 0 0 3 0x14280 nfsidl nfsio 56472 361858 0 0 3 0x14280 nfsidl nfsio 96506 257896 0 0 3 0x14280 nfsidl nfsio 51948 53674 0 0 3 0x14280 nfsidl nfsio 96623 11546 0 0 3 0x14280 nfsidl nfsio 26110 20255 0 0 3 0x14280 nfsidl nfsio 43285 2123 0 0 3 0x14280 nfsidl nfsio 57838 415932 0 0 3 0x14280 nfsidl nfsio 77492 91955 0 0 3 0x14280 nfsidl nfsio 61001 1347 24304 0 2 0xc82 syz-executor 53168 272986 0 0 3 0x14200 acct acct 71619 228172 0 0 3 0x14200 bored sosplice 6546 442644 1 0 3 0x100083 ttyopn getty 96354 57962 24304 0 3 0x82 piperd syz-executor 31275 160571 24304 0 3 0x82 piperd syz-executor 6485 302331 24304 0 3 0x82 piperd syz-executor 80543 399752 24304 0 2 0xc82 syz-executor 24449 12086 24304 0 2 0xc82 syz-executor 24048 66154 24304 0 2 0xc82 syz-executor 95111 282913 24304 0 3 0x82 wait syz-executor *24304 459501 92914 0 7 0x2 syz-executor 92914 35269 73998 0 3 0x10008a sigsusp ksh 73998 406330 71570 0 3 0x98 kqread sshd-session 71570 20847 24720 0 3 0x92 kqread sshd-session 24720 187815 1 0 3 0x88 kqread sshd 20215 48551 29671 74 3 0x1100092 bpf pflogd 29671 336408 1 0 3 0x80 sbwait pflogd 7747 29343 66920 73 3 0x1100090 kqread syslogd 66920 513373 1 0 3 0x100082 sbwait syslogd 77882 277938 1 0 3 0x100080 kqread resolvd 71375 179903 57428 77 3 0x100092 kqread dhcpleased 7590 241278 57428 77 3 0x100092 kqread dhcpleased 57428 209201 1 0 3 0x80 kqread dhcpleased 11745 444428 0 0 3 0x14200 bored smr 23341 288675 0 0 3 0x14200 pgzero zerothread 62040 150871 0 0 3 0x14200 aiodoned aiodoned 88109 94810 0 0 3 0x14200 syncer update 60757 82091 0 0 3 0x14200 cleaner cleaner 99877 256384 0 0 3 0x14200 reaper reaper 5514 275733 0 0 3 0x14200 pgdaemon pagedaemon 94431 301118 0 0 3 0x14200 bored viomb 59841 255594 0 0 3 0x40014200 acpi0 acpi0 28658 107062 0 0 3 0x40014200 idle1 33849 32650 0 0 3 0x14200 bored softnet7 25828 433286 0 0 3 0x14200 bored softnet6 2392 243232 0 0 3 0x14200 bored softnet5 26058 412519 0 0 3 0x14200 bored softnet4 39229 384674 0 0 3 0x14200 bored softnet3 15266 372106 0 0 3 0x14200 bored softnet2 675 440335 0 0 3 0x14200 bored softnet1 47893 213667 0 0 2 0x14200 softnet0 8255 381420 0 0 2 0x14200 systqmp 76328 68121 0 0 3 0x14200 bored systq 86909 509278 0 0 2 0x14200 softclockmp 32163 471665 0 0 7 0x40014200 softclock 92841 30832 0 0 3 0x40014200 idle0 1 14379 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 62448 (syz-executor) thread 0xffff80002a3d7cc0 (378815) exclusive rrwlock inode r = 0 (0xfffffd806ea32240) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10243 11052K 11093K 166960K 11567 0 pcb 17 14K 16K 166960K 358 0 rtable 206 9K 9K 166960K 390 0 pf 38 18K 82K 166960K 114 0 ifaddr 42 7K 8K 166960K 76 0 ifgroup 59 2K 3K 166960K 122 0 sysctl 4 1K 9K 166960K 13 0 counters 70 37K 37K 166960K 124 0 ioctlops 0 0K 4K 166960K 1646 0 iov 0 0K 28K 166960K 39 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1335 84K 85K 166960K 1727 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 28 0 dirhash 12 2K 2K 166960K 36 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 15 53K 89K 166960K 769 0 sigio 0 0K 0K 166960K 17 0 proc 72 115K 164K 166960K 619 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 79 0 in_multi 88 6K 7K 166960K 133 0 ether_multi 1 0K 0K 166960K 3 0 mrt 2 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 223 996K 996K 166960K 223 0 exec 0 0K 1K 166960K 513 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 233 167K 183K 166960K 8627 0 UVM aobj 22 6K 6K 166960K 24 0 pinsyscall 40 80K 102K 166960K 1892 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 48 0 NDP 13 0K 2K 166960K 50 0 temp 67 8648K 8770K 166960K 41521 0 kqueue 13 20K 29K 166960K 139 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 95 0 92 1 0 1 1 0 8 0 rtentry 176 126 0 42 5 0 5 5 0 8 0 unpcb 144 460 0 439 2 0 2 2 0 8 1 syncache 336 6 0 6 1 1 0 1 0 8 0 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 736 168 0 161 2 1 1 2 0 8 0 arp 128 17 0 5 1 0 1 1 0 8 0 inpcb 328 855 0 843 7 3 4 7 0 8 2 nd6 144 21 0 4 1 0 1 1 0 8 0 pkpcb 40 5 0 5 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1192 18 0 18 1 0 1 1 0 8 1 pppxif 1504 1 0 1 1 0 1 1 0 8 1 pfstscr 40 1 0 0 1 0 1 1 0 8 0 pffrag 232 6 0 2 1 0 1 1 0 482 0 pffrnode 88 5 0 2 1 0 1 1 0 8 0 pffrent 40 9 0 5 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 1 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 75 0 23 1 0 1 1 0 8 0 pfstkey 128 79 0 27 2 0 2 2 0 8 0 pfstate 384 69 0 19 6 0 6 6 0 8 0 pfrule 1344 27 0 21 2 1 1 2 0 8 0 rttmr 136 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 563 0 164 30 2 28 30 0 8 2 art_table 40 565 0 164 5 0 5 5 0 8 0 art_node 32 126 0 53 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 12 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 25 0 15 1 0 1 1 0 8 0 shmpl 112 21 0 2 1 0 1 1 0 8 0 dirhash 1024 34 0 17 3 0 3 3 0 8 0 dino2pl 256 2780 0 1271 96 0 96 96 0 8 0 ffsino 296 2780 0 1271 117 0 117 117 0 8 0 nchpl 144 3852 0 2156 64 0 64 64 0 8 0 rtmask 32 7 0 7 1 1 0 1 0 8 0 uvmvnodes 80 2997 0 0 62 0 62 62 0 8 0 vnodes 216 2997 0 0 167 0 167 167 0 8 0 namei 1024 12675 0 12675 1 0 1 1 0 8 1 percpumem 16 77 0 27 1 0 1 1 0 8 0 kstatmem 264 68 0 38 3 0 3 3 0 8 1 scsiplug 72 2 0 2 1 1 0 1 0 8 0 scxspl 216 18471 0 18471 9 7 2 7 1 8 2 plimitpl 152 304 0 286 1 0 1 1 0 8 0 sigapl 424 1096 0 1023 9 0 9 9 0 8 0 knotepl 120 535 0 0 17 0 17 17 0 8 0 kqueuepl 224 351 0 342 5 1 4 5 0 8 3 pipepl 344 216 0 188 6 0 6 6 0 8 3 fdescpl 528 1051 0 1022 3 0 3 3 0 8 0 filepl 160 6232 0 6011 15 2 13 15 0 8 2 lockfpl 104 483 0 481 4 3 1 4 0 8 0 lockfspl 48 93 0 91 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 90 0 73 1 0 1 1 0 8 0 ucredpl 104 816 0 802 1 0 1 1 0 8 0 zombiepl 144 1026 0 1023 1 0 1 1 0 8 0 processpl 1232 1096 0 1023 6 0 6 6 0 8 0 procpl 664 2201 0 2121 8 0 8 8 0 8 0 sosppl 168 6 0 6 1 0 1 1 0 8 1 sockpl 752 1494 0 1458 12 4 8 12 0 8 3 mcl64k 65536 23 0 0 3 0 3 3 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 43 0 0 6 0 6 6 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 210 0 0 14 0 14 14 0 8 0 bufpl 280 7243 0 1100 439 0 439 439 0 8 0 anonpl 32 11813 0 0 96 0 96 96 0 246 0 amapchunkpl 152 29034 0 28568 37 8 29 34 0 158 7 amappl16 200 3592 0 3463 29 11 18 18 0 8 10 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 120 0 108 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 1711 0 1682 3 1 2 2 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 3 0 3 1 1 0 1 0 8 0 amappl9 144 253 0 253 1 1 0 1 0 8 0 amappl8 136 21 0 19 1 0 1 1 0 8 0 amappl7 128 112 0 100 1 0 1 1 0 8 0 amappl6 120 200 0 197 1 0 1 1 0 8 0 amappl5 112 125 0 115 1 0 1 1 0 8 0 amappl4 104 308 0 286 1 0 1 1 0 8 0 amappl3 96 4910 0 4817 3 0 3 3 0 8 0 amappl2 88 1308 0 1231 2 0 2 2 0 8 0 amappl1 80 11690 0 11087 16 1 15 16 0 8 0 amappl 88 7812 0 7654 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 7 0 7 2 2 0 1 0 8 0 dma128 128 254 0 254 2 2 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 2 2 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 1051 0 1022 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1051 0 1022 1 0 1 1 0 8 0 vmmpekpl 168 10170 0 10123 3 0 3 3 0 8 0 vmmpepl 168 72099 0 70075 108 4 104 104 0 357 5 vmsppl 488 1050 0 1022 5 0 5 5 0 8 0 rwobjpl 80 24383 0 20324 87 0 87 87 0 8 3 pdppl 4096 2110 0 2044 100 28 72 84 0 8 6 pvpl 32 21290 0 0 173 1 172 172 0 265 0 pmappl 256 1050 0 1022 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 283 0 35 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83837ff0) 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(ffffffff838727a8) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838727a8) at __mp_lock+0x199 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff838727a8,1) 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 softclock_thread_run(ffffffff83792c58) at softclock_thread_run+0x79 sys/kern/kern_timeout.c:836 softclock_thread(ffff8000fffff4c0) at softclock_thread+0x10a sys/kern/kern_timeout.c:858 end trace frame: 0x0, count: 7 ddb{0}> trace x86_ipi_db(ffffffff83837ff0) 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(ffffffff838727a8) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838727a8) at __mp_lock+0x199 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff838727a8,1) 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 softclock_thread_run(ffffffff83792c58) at softclock_thread_run+0x79 sys/kern/kern_timeout.c:836 softclock_thread(ffff8000fffff4c0) at softclock_thread+0x10a sys/kern/kern_timeout.c:858 end trace frame: 0x0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7b31eba92fc0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7b31eba92fc0, count: -1