uvm_fault(0xfffffd80772de3e8, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff82b1be78 cs 8 rflags 10246 cr2 0 cpl 0 rsp ffff80002a37cf10 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff82b1be78 Starting stack trace... panic(ffffffff833a7bb0) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a37ce60) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001760000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(31e5f,81,2000,ffff80003a835cb0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(31e5f,81,2000,ffff80003a835cb0) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002a37d010) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd800ba68b30,81,fffffd80097fb2d8,ffff80003a835cb0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805d4eb280,ffff80003a835cb0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805d4eb280,ffff80003a835cb0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805d4eb280,ffff80003a835cb0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805d4eb280,ffff80003a835cb0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003a835cb0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003a835cb0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003a835cb0,ffff80002a37d380,ffff80002a37d2d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a37d380) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a37d380) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ed49edea910, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 -749704328 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND * 25702 14947 0 0 0 1 syz-executor 78078 43656 0 0x14000 0x40000200 0 softclock savectx() at savectx+0xae end of kernel end trace frame: 0x7b98d3506b60, 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(0xfffffd80772de3e8, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7b98d3506b60, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800031425560 rbx 0 rdx 0 rcx 0xffff80002a2e5cc8 rax 0x3b r8 0xffff800031425490 r9 0x1 r10 0x2e6b7515e0ef32ee r11 0x788ad1f8cea9d1da r12 0 r13 0 r14 0xffff80002a2e5cc8 r15 0 rip 0xffffffff820703ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff8000314254e0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=25702 pid=14947 tcnt=4 stat=onproc flags process=0 proc=0 runpri=32, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003a8342c0,0xffff80002a2e4050 process=0xffff80003a0270e0 user=0xffff800031420000, vmspace=0xfffffd80772de5d0 estcpu=34, cpticks=22, pctcpu=0.21, user=19, sys=2, intr=1 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 98944 117844 3258 0 2 0xc80 syz-executor 98944 479393 3258 0 3 0x4000080 fsleep syz-executor 98944 88633 3258 0 3 0x4000080 fsleep syz-executor 33414 320172 63531 0 2 0 syz-executor 33414 399584 63531 0 3 0x4000080 fsleep syz-executor 43026 298667 55752 0 2 0 syz-executor 43026 442273 55752 0 2 0x4000000 syz-executor 43026 273958 55752 0 2 0x4000000 syz-executor 935 389340 56042 0 2 0 syz-executor 935 82434 56042 0 2 0x4000000 syz-executor 935 241817 56042 0 3 0x4000000 inode syz-executor 935 71052 56042 0 3 0x4000080 fsleep syz-executor *14947 25702 34656 0 7 0 syz-executor 14947 428738 34656 0 3 0x4000080 kqsel syz-executor 14947 394754 34656 0 3 0x4000080 fsleep syz-executor 14947 173652 34656 0 3 0x4000080 fsleep syz-executor 5039 210337 82610 0 2 0xc80 syz-executor 5039 130161 82610 0 3 0x4000080 fsleep syz-executor 5039 367966 82610 0 3 0x4000080 kqsel syz-executor 5039 273053 82610 0 3 0x4000080 fsleep syz-executor 33017 438797 0 0 3 0x14200 acct acct 40557 398959 1 0 2 0x100083 getty 34656 277572 74712 0 2 0xc82 syz-executor 60154 194919 74712 0 2 0x2 syz-executor 3258 476857 74712 0 2 0xc82 syz-executor 16440 285707 0 0 3 0x14200 bored sosplice 56042 390469 74712 0 2 0xc82 syz-executor 55752 356519 74712 0 2 0xc82 syz-executor 19558 10036 74712 0 2 0xc82 syz-executor 63531 447277 74712 0 2 0x3 syz-executor 82610 26024 74712 0 2 0xc82 syz-executor 74712 396963 42879 0 3 0x82 kqread syz-executor 42879 266791 65469 0 3 0x10008a sigsusp ksh 65469 257295 90078 0 3 0x98 kqread sshd-session 90078 331785 19178 0 3 0x92 kqread sshd-session 19178 52385 1 0 3 0x88 kqread sshd 72072 218054 29182 74 3 0x1100092 bpf pflogd 29182 64299 1 0 3 0x80 sbwait pflogd 71802 387592 48742 73 3 0x1100090 kqread syslogd 48742 175846 1 0 3 0x100082 sbwait syslogd 62009 375111 1 0 3 0x100080 kqread resolvd 33553 419804 84717 77 3 0x100092 kqread dhcpleased 36421 162680 84717 77 3 0x100092 kqread dhcpleased 84717 286600 1 0 3 0x80 kqread dhcpleased 44278 234875 0 0 3 0x14200 bored smr 53132 167989 0 0 2 0x14200 zerothread 65107 11098 0 0 3 0x14200 aiodoned aiodoned 87357 328092 0 0 2 0x14e00 update 80704 278827 0 0 3 0x14200 cleaner cleaner 79372 332750 0 0 3 0x14200 reaper reaper 54479 178590 0 0 3 0x14200 pgdaemon pagedaemon 86357 58020 0 0 3 0x14200 bored viomb 31987 461391 0 0 3 0x40014200 acpi0 acpi0 61811 178342 0 0 3 0x40014200 idle1 19112 388231 0 0 3 0x14200 bored softnet7 7045 302738 0 0 3 0x14200 bored softnet6 9352 394924 0 0 3 0x14200 bored softnet5 25952 385565 0 0 3 0x14200 bored softnet4 7945 134238 0 0 3 0x14200 bored softnet3 13041 216818 0 0 3 0x14200 bored softnet2 61585 479520 0 0 3 0x14200 bored softnet1 41977 60554 0 0 2 0x14200 softnet0 47128 75079 0 0 2 0x14200 systqmp 9555 523557 0 0 3 0x14200 bored systq 68271 46407 0 0 3 0x14200 netlock softclockmp 43656 78078 0 0 7 0x40014200 softclock 8432 453524 0 0 3 0x40014200 idle0 1 436328 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 935 (syz-executor) thread 0xffff80002a2e42d8 (82434) exclusive rrwlock inode r = 0 (0xfffffd806e0b1f00) #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 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 Process 60154 (syz-executor) thread 0xffff80003a834d20 (194919) exclusive rrwlock inode r = 0 (0xfffffd806e0b4a58) #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 vget+0x2a2 sys/kern/vfs_subr.c:693 #6 cache_lookup+0x351 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #10 namei+0x7ca sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #13 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10271 11157K 13829K 166960K 16623 0 pcb 19 18K 20K 166960K 693 0 rtable 185 11K 12K 166960K 728 0 pf 40 18K 82K 166960K 337 0 ifaddr 37 6K 9K 166960K 181 0 ifgroup 66 2K 3K 166960K 346 0 sysctl 4 1K 9K 166960K 95 0 counters 72 37K 38K 166960K 462 0 ioctlops 0 0K 4K 166960K 2117 0 iov 0 0K 28K 166960K 248 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1632 103K 103K 166960K 4187 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 10K 10K 166960K 13 0 VM map 2 1K 1K 166960K 2 0 sem 25 3K 3K 166960K 107 0 dirhash 12 2K 2K 166960K 51 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 240K 166960K 2551 0 sigio 0 0K 0K 166960K 93 0 proc 72 115K 180K 166960K 986 0 subproc 72 4K 4K 166960K 119 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 550 0 in_multi 61 4K 7K 166960K 243 0 ether_multi 1 0K 0K 166960K 16 0 mrt 1 0K 0K 166960K 9 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 247 1102K 1102K 166960K 247 0 exec 0 0K 1K 166960K 965 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 5 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 257 162K 181K 166960K 24808 0 UVM aobj 127 6K 6K 166960K 133 0 pinsyscall 42 84K 100K 166960K 3785 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 192 0 NDP 14 0K 2K 166960K 127 0 temp 85 8652K 12998K 166960K 131733 0 kqueue 14 22K 28K 166960K 439 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 120 347 0 343 5 4 1 3 0 8 0 rtentry 176 226 0 164 5 1 4 5 0 8 0 unpcb 144 1677 0 1659 15 13 2 6 0 8 1 syncache 336 13 0 13 6 6 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 875 0 871 19 18 1 4 0 8 0 arp 128 30 0 20 1 0 1 1 0 8 0 inpcb 328 3283 0 3271 30 28 2 13 0 8 0 nd6 144 36 0 23 1 0 1 1 0 8 0 pkpcb 40 89 0 87 7 6 1 1 0 8 0 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 156 0 156 5 4 1 1 0 8 1 pppxif 1504 17 0 17 6 5 1 1 0 8 1 pffrag 232 16 0 5 2 1 1 1 0 482 0 pffrnode 88 15 0 4 2 1 1 1 0 8 0 pffrent 40 19 0 8 2 1 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 5 0 4 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 17 0 14 1 0 1 1 0 8 0 pfstkey 128 17 0 14 1 0 1 1 0 8 0 pfstate 384 17 0 14 2 1 1 2 0 8 0 pfrule 1344 23 0 17 2 1 1 2 0 8 0 rttmr 136 4 0 4 3 3 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 919 0 642 35 13 22 29 0 8 0 art_table 40 922 0 642 5 0 5 5 0 8 0 art_node 32 220 0 168 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 14 2 1 1 1 0 8 0 semupl 112 9 0 9 3 3 0 1 0 8 0 semapl 112 100 0 77 1 0 1 1 0 8 0 shmpl 112 130 0 6 4 0 4 4 0 8 0 dirhash 1024 44 0 27 3 0 3 3 0 8 0 dino2pl 256 6196 0 4677 96 0 96 96 0 8 1 ffsino 296 6197 0 4677 118 0 118 118 0 8 1 nchpl 144 9739 0 8028 64 0 64 64 0 8 0 rtmask 32 20 0 20 6 5 1 1 0 8 1 uvmvnodes 80 8109 0 0 166 0 166 166 0 8 0 vnodes 216 8109 0 0 451 0 451 451 0 8 0 namei 1024 35496 0 35494 4 3 1 2 0 8 0 percpumem 16 246 0 195 1 0 1 1 0 8 0 kstatmem 264 210 0 174 3 0 3 3 0 8 0 scsiplug 72 8 0 8 4 4 0 1 0 8 0 scxspl 216 78096 0 78096 18 17 1 8 1 8 1 plimitpl 152 521 0 504 1 0 1 1 0 8 0 sigapl 424 2840 0 2785 7 0 7 7 0 8 0 knotepl 120 598 0 0 18 0 18 18 0 8 0 kqueuepl 224 884 0 872 9 8 1 5 0 8 0 pipepl 344 423 0 395 7 4 3 7 0 8 0 fdescpl 528 2811 0 2780 3 0 3 3 0 8 0 filepl 160 20769 0 20471 38 24 14 21 0 8 0 lockfpl 104 1641 0 1636 4 3 1 2 0 8 0 lockfspl 48 701 0 696 1 0 1 1 0 8 0 sessionpl 144 37 0 28 1 0 1 1 0 8 0 pgrppl 48 78 0 61 1 0 1 1 0 8 0 ucredpl 104 3078 0 3065 1 0 1 1 0 8 0 zombiepl 144 3019 0 3018 1 0 1 1 0 8 0 processpl 1248 2840 0 2785 5 0 5 5 0 8 0 procpl 664 6966 0 6897 9 2 7 7 0 8 0 sosppl 168 14 0 14 5 5 0 1 0 8 0 sockpl 752 5533 0 5496 58 51 7 18 0 8 3 mcl64k 65536 14 0 0 2 0 2 2 0 8 0 mcl16k 16384 9 0 0 2 0 2 2 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 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 124 0 0 16 0 16 16 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 60 0 0 8 0 8 8 0 8 0 mtagpl 96 119 0 0 3 0 3 3 0 8 0 mbufpl 256 455 0 0 26 0 26 26 0 8 0 bufpl 280 32317 0 26174 440 0 440 440 0 8 0 anonpl 32 18152 0 0 147 0 147 147 0 246 0 amapchunkpl 152 85044 0 84397 66 31 35 36 0 158 8 amappl16 200 10873 0 10748 100 84 16 44 0 8 0 amappl15 192 4 0 4 2 2 0 1 0 8 0 amappl14 184 174 0 162 1 0 1 1 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 3544 0 3513 3 1 2 2 0 8 0 amappl11 160 62 0 47 1 0 1 1 0 8 0 amappl10 152 6 0 5 2 1 1 1 0 8 0 amappl9 144 276 0 276 1 1 0 1 0 8 0 amappl8 136 23 0 20 1 0 1 1 0 8 0 amappl7 128 126 0 113 1 0 1 1 0 8 0 amappl6 120 250 0 246 1 0 1 1 0 8 0 amappl5 112 148 0 138 1 0 1 1 0 8 0 amappl4 104 343 0 323 1 0 1 1 0 8 0 amappl3 96 17432 0 17314 4 0 4 4 0 8 0 amappl2 88 767 0 704 2 0 2 2 0 8 0 amappl1 80 19772 0 19169 17 2 15 15 0 8 0 amappl 88 23616 0 23432 5 0 5 5 0 92 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 dma512 512 2 0 2 2 2 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 256 0 256 4 4 0 1 0 8 0 dma64 64 8 0 8 3 3 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 72 132 0 6 3 0 3 3 0 8 0 uaddrrnd 24 2811 0 2780 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2811 0 2780 1 0 1 1 0 8 0 vmmpekpl 168 22883 0 22840 3 0 3 3 0 8 0 vmmpepl 168 182770 0 180638 145 35 110 125 0 357 0 vmsppl 488 2810 0 2780 5 0 5 5 0 8 0 rwobjpl 80 56558 0 47273 190 0 190 190 0 8 0 pdppl 4096 5630 0 5560 120 48 72 84 0 8 2 pvpl 32 24654 0 0 199 1 198 198 0 265 0 pmappl 256 2810 0 2780 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 351 0 94 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8386bff0) 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(ffffffff83938498) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83938498) at __mp_lock+0x192 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff83938498,1) 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(ffffffff837e6068) at softclock_thread_run+0x79 sys/kern/kern_timeout.c:836 softclock_thread(ffff8000fffff228) at softclock_thread+0x10a sys/kern/kern_timeout.c:858 end trace frame: 0x0, count: 7 ddb{0}> trace x86_ipi_db(ffffffff8386bff0) 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(ffffffff83938498) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83938498) at __mp_lock+0x192 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff83938498,1) 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(ffffffff837e6068) at softclock_thread_run+0x79 sys/kern/kern_timeout.c:836 softclock_thread(ffff8000fffff228) 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: 0x7b98d3506b60, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7b98d3506b60, count: -1