uvm_fault(0xfffffd805ee2bb98, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff82a55b08 cs 8 rflags 10246 cr2 0 cpl 0 rsp ffff80002a32bf00 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff82a55b08 Starting stack trace... panic(ffffffff833c66d9) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a32be50) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001587000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,81,2000,ffff8000ffff2018) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff8000ffff2018) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80002a32c000) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805c1289a0,81,fffffd80097fb340,ffff8000ffff2018) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806f9f1db0,ffff8000ffff2018) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806f9f1db0,ffff8000ffff2018) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806f9f1db0,ffff8000ffff2018) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806f9f1db0,ffff8000ffff2018) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000ffff2018) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000ffff2018,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000ffff2018,ffff80002a32c370,ffff80002a32c2c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a32c370) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a32c370) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71ad4f29ed80, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 4 248 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND * 94189 58515 0 0x2 0 1 syz-executor 392852 37771 0 0x14000 0x200 0 reaper savectx() at savectx+0xae end of kernel end trace frame: 0x752dfc144de0, 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(0xfffffd805ee2bb98, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x752dfc144de0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a308c40 rbx 0 rdx 0 rcx 0xffff800039ffd250 rax 0x33 r8 0xffff80002a308b70 r9 0x1 r10 0x52e61dc0ecafe263 r11 0xce209f25efb2f944 r12 0 r13 0 r14 0xffff800039ffd250 r15 0 rip 0xffffffff820e73ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a308bc0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=94189 pid=58515 tcnt=1 stat=onproc flags process=2 proc=0 runpri=83, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff3240,0xffff8000fffea7f8 process=0xffff8000fffec018 user=0xffff80002a303000, vmspace=0xfffffd806be09020 estcpu=36, cpticks=88, pctcpu=0.22, user=4, sys=80, intr=4 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 9327 46339 56842 0 3 0x82 wait syz-executor 99957 346686 42218 60929 3 0x90 nanoslp syz-executor 99957 60076 42218 60929 3 0x4000090 lockf syz-executor 99957 95740 42218 60929 3 0x4000090 fsleep syz-executor 45945 505818 59169 0 3 0x80 nanoslp syz-executor 45945 506545 59169 0 3 0x4000080 fifor syz-executor 45945 225762 59169 0 3 0x4000080 fsleep syz-executor 42218 324303 56842 0 3 0x82 nanoslp syz-executor 59169 57196 56842 0 3 0x82 nanoslp syz-executor 36281 398446 56842 0 3 0x82 nanoslp syz-executor *58515 94189 56842 0 7 0x2 syz-executor 86060 397999 1 0 3 0x100083 ttyopn getty 51824 107511 56842 0 2 0x2 syz-executor 16241 44719 56842 0 3 0x82 nanoslp syz-executor 93312 331001 56842 0 3 0x82 nanoslp syz-executor 56842 475162 59519 0 3 0x82 kqread syz-executor 59519 372777 64140 0 3 0x10008a sigsusp ksh 64140 377800 41546 0 3 0x98 kqread sshd-session 41546 443704 78936 0 3 0x92 kqread sshd-session 78936 269647 1 0 3 0x88 kqread sshd 55842 255103 47700 74 3 0x1100092 bpf pflogd 47700 141941 1 0 3 0x80 sbwait pflogd 84307 278462 49217 73 3 0x1100090 kqread syslogd 49217 113340 1 0 3 0x100082 sbwait syslogd 79514 422222 1 0 3 0x100080 kqread resolvd 11941 375864 21691 77 3 0x100092 kqread dhcpleased 62104 400055 21691 77 3 0x100092 kqread dhcpleased 21691 98222 1 0 3 0x80 kqread dhcpleased 84931 350607 0 0 3 0x14200 bored smr 14974 329929 0 0 2 0x14200 zerothread 31104 425785 0 0 3 0x14200 aiodoned aiodoned 9106 240138 0 0 3 0x14200 syncer update 46112 395830 0 0 3 0x14200 cleaner cleaner 37771 392852 0 0 7 0x14200 reaper 86809 113200 0 0 3 0x14200 pgdaemon pagedaemon 96466 363138 0 0 3 0x14200 bored viomb 15934 497850 0 0 3 0x40014200 acpi0 acpi0 109 281460 0 0 3 0x40014200 idle1 17460 405095 0 0 3 0x14200 bored softnet1 8614 81693 0 0 3 0x14200 bored softnet0 65253 316232 0 0 2 0x40014200 systqmp 35854 77007 0 0 3 0x14200 bored systq 56233 389326 0 0 3 0x14200 tmoslp softclockmp 26519 162551 0 0 3 0x40014200 tmoslp softclock 74746 174907 0 0 3 0x40014200 idle0 1 207173 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff839cc960) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 uvm_pmr_freepages+0x1a8 sys/uvm/uvm_pmemrange.c:-1 #4 uvm_anfree_list+0x1e5 sys/uvm/uvm_anon.c:129 #5 amap_wipeout+0x248 sys/uvm/uvm_amap.c:-1 #6 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 #7 uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 #8 exit1+0x6fc sys/kern/kern_exit.c:260 #9 sys_exit+0x1a sys/kern/kern_exit.c:-1 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #11 Xsyscall+0x128 Process 51824 (syz-executor) thread 0xffff8000ffff2d10 (107511) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10257 11156K 12373K 166960K 13507 0 pcb 17 14K 22K 166960K 400 0 rtable 241 12K 13K 166960K 790 0 pf 39 18K 67486K 166960K 238 0 ifaddr 39 7K 7K 166960K 152 0 ifgroup 59 2K 2K 166960K 270 0 sysctl 4 1K 9K 166960K 21 0 counters 70 37K 38K 166960K 350 0 ioctlops 0 0K 4K 166960K 1946 0 iov 0 0K 24K 166960K 149 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1463 92K 92K 166960K 2998 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 24 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 98 0 dirhash 12 2K 3K 166960K 48 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 14 49K 236K 166960K 1883 0 sigio 0 0K 0K 166960K 28 0 proc 73 115K 180K 166960K 922 0 subproc 72 4K 4K 166960K 131 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 218 0 in_multi 78 5K 7K 166960K 214 0 ether_multi 1 0K 0K 166960K 20 0 mrt 0 0K 0K 166960K 19 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 271 1208K 1208K 166960K 271 0 exec 0 0K 1K 166960K 807 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 7 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 233 160K 178K 166960K 18611 0 UVM aobj 8 2K 2K 166960K 8 0 pinsyscall 39 78K 102K 166960K 3140 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 115 0 NDP 13 0K 2K 166960K 106 0 temp 83 8660K 8916K 166960K 129414 0 kqueue 14 22K 32K 166960K 380 0 SYN cache 2 8K 16K 166960K 3 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 120 249 0 246 3 2 1 3 0 8 0 rtentry 176 236 0 145 6 1 5 6 0 8 0 unpcb 144 1128 0 1109 8 7 1 6 0 8 0 syncache 336 9 0 9 6 5 1 1 0 8 1 tcpqe 32 4 0 4 4 3 1 1 0 8 1 tcpcb 736 798 0 791 21 19 2 8 0 8 1 arp 136 38 0 22 1 0 1 1 0 8 0 inpcb 328 1971 0 1961 24 22 2 7 0 8 0 nd6 152 42 0 21 1 0 1 1 0 8 0 pkpcb 40 49 0 49 4 3 1 1 0 8 1 kcovpl 48 14 0 6 1 0 1 1 0 8 0 mppekey 1024 2 0 2 1 1 0 1 0 8 0 ppxss 1192 111 0 111 2 1 1 1 0 8 1 pppxif 1504 13 0 13 6 5 1 1 0 8 1 pfstscr 40 5 0 4 1 0 1 1 0 8 0 pffrag 232 14 0 5 1 0 1 1 0 482 0 pffrnode 88 11 0 3 1 0 1 1 0 8 0 pffrent 40 16 0 7 1 0 1 1 0 8 0 pfosfp 40 1429 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1429 0 714 21 0 21 21 0 8 0 pfrktable 1344 2 0 2 2 1 1 1 0 8 1 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 37 0 29 1 0 1 1 0 8 0 pfstkey 128 49 0 41 2 0 2 2 0 8 0 pfstate 384 42 0 36 4 1 3 4 0 8 0 pfrule 1344 32 0 26 2 1 1 2 0 8 0 rttmr 136 5 0 5 3 3 0 1 0 8 0 art_heap8 4096 6 0 0 6 0 6 6 0 8 0 art_heap4 256 1043 0 659 35 10 25 29 0 8 0 art_table 40 1049 0 659 5 0 5 5 0 8 0 art_node 32 231 0 150 1 0 1 1 0 8 0 sysvmsgpl 40 15 0 7 1 0 1 1 0 8 0 semupl 112 5 0 5 3 3 0 1 0 8 0 semapl 112 95 0 85 1 0 1 1 0 8 0 shmpl 112 5 0 0 1 0 1 1 0 8 0 dirhash 1024 41 0 24 3 0 3 3 0 8 0 dino2pl 256 4942 0 3427 96 0 96 96 0 8 0 ffsino 296 4942 0 3427 118 0 118 118 0 8 0 nchpl 144 7479 0 5768 64 0 64 64 0 8 0 rtmask 32 12 0 12 5 5 0 1 0 8 0 vnodes 216 5833 0 0 325 0 325 325 0 8 0 namei 1024 26637 0 26636 4 3 1 2 0 8 0 percpumem 16 190 0 140 1 0 1 1 0 8 0 kstatmem 264 164 0 134 4 1 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 7 0 7 4 4 0 1 0 8 0 scxspl 216 45824 0 45824 17 15 2 8 1 8 2 plimitpl 152 582 0 565 1 0 1 1 0 8 0 sigapl 424 2151 0 2105 7 1 6 7 0 8 0 knotepl 120 564 0 0 17 0 17 17 0 8 0 kqueuepl 224 1082 0 1072 20 16 4 7 0 8 3 pipepl 344 361 0 334 9 6 3 9 0 8 0 fdescpl 528 2131 0 2103 3 0 3 3 0 8 0 filepl 160 14534 0 14316 29 16 13 19 0 8 0 lockfpl 104 787 0 781 2 1 1 2 0 8 0 lockfspl 48 312 0 309 1 0 1 1 0 8 0 sessionpl 144 35 0 26 1 0 1 1 0 8 0 pgrppl 48 71 0 54 1 0 1 1 0 8 0 ucredpl 104 2858 0 2843 1 0 1 1 0 8 0 zombiepl 144 2109 0 2105 1 0 1 1 0 8 0 processpl 1232 2151 0 2105 5 1 4 5 0 8 0 procpl 664 5044 0 4993 6 0 6 6 0 8 0 sosppl 176 13 0 13 4 3 1 1 0 8 1 sockpl 752 3544 0 3512 33 28 5 17 0 8 1 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 126 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 49 0 0 6 0 6 6 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 243 0 0 15 0 15 15 0 8 0 bufpl 280 18935 0 12798 439 0 439 439 0 8 0 anonpl 32 12458 0 0 102 1 101 101 0 246 0 amapchunkpl 152 63472 0 62941 58 26 32 40 0 158 4 amappl16 200 6943 0 6871 44 20 24 25 0 8 8 amappl15 192 12 0 12 2 2 0 1 0 8 0 amappl14 184 3 0 3 3 3 0 1 0 8 0 amappl13 176 485 0 484 1 0 1 1 0 8 0 amappl12 168 2538 0 2499 3 0 3 3 0 8 0 amappl11 160 36 0 36 1 1 0 1 0 8 0 amappl10 152 51 0 37 1 0 1 1 0 8 0 amappl9 144 281 0 281 1 1 0 1 0 8 0 amappl8 136 31 0 28 1 0 1 1 0 8 0 amappl7 128 105 0 102 1 0 1 1 0 8 0 amappl6 120 352 0 339 1 0 1 1 0 8 0 amappl5 112 82 0 71 1 0 1 1 0 8 0 amappl4 104 477 0 446 1 0 1 1 0 8 0 amappl3 96 11111 0 11035 4 1 3 3 0 8 0 amappl2 88 2275 0 2201 2 0 2 2 0 8 0 amappl1 80 18057 0 17481 15 0 15 15 0 8 0 amappl 88 17477 0 17323 5 0 5 5 0 92 0 uvmvnodes 80 5833 0 0 120 0 120 120 0 8 0 dma65536 65536 2 0 2 1 0 1 1 0 8 1 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 128 254 0 254 2 2 0 1 0 8 0 dma64 64 10 0 10 4 3 1 1 0 8 1 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 7 0 0 1 0 1 1 0 8 0 uaddrrnd 24 2131 0 2103 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2131 0 2103 1 0 1 1 0 8 0 vmmpekpl 168 17675 0 17628 3 0 3 3 0 8 0 vmmpepl 168 141363 0 139544 115 8 107 107 0 357 7 vmsppl 488 2130 0 2101 6 1 5 5 0 8 0 rwobjpl 80 44100 0 37309 142 1 141 141 0 8 0 pdppl 4096 4269 0 4202 113 40 73 85 0 8 6 pvpl 32 21892 0 0 178 2 176 176 0 265 0 pmappl 256 2130 0 2101 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 332 0 80 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83827ff0) 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 mtx_enter(ffffffff838cac28) at mtx_enter+0x77 sys/kern/kern_lock.c:261 wakeup_n(ffffffff839cc7b0,ffffffff) at wakeup_n+0x54 sys/kern/kern_synch.c:579 uvm_pmr_freepageq(ffff80002a244278) at uvm_pmr_freepageq+0x3b6 sys/uvm/uvm_pmemrange.c:1389 km_free(ffff8000387e9000,6000,ffffffff8373fd10,ffffffff8377c068) at km_free+0x36b sys/uvm/uvm_km.c:827 uvm_uarea_free(ffff8000ffff2fa8) at uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304 reaper(ffff8000ffffd760) at reaper+0x1aa sys/kern/kern_exit.c:493 end trace frame: 0x0, count: 6 ddb{0}> trace x86_ipi_db(ffffffff83827ff0) 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 mtx_enter(ffffffff838cac28) at mtx_enter+0x77 sys/kern/kern_lock.c:261 wakeup_n(ffffffff839cc7b0,ffffffff) at wakeup_n+0x54 sys/kern/kern_synch.c:579 uvm_pmr_freepageq(ffff80002a244278) at uvm_pmr_freepageq+0x3b6 sys/uvm/uvm_pmemrange.c:1389 km_free(ffff8000387e9000,6000,ffffffff8373fd10,ffffffff8377c068) at km_free+0x36b sys/uvm/uvm_km.c:827 uvm_uarea_free(ffff8000ffff2fa8) at uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304 reaper(ffff8000ffffd760) at reaper+0x1aa sys/kern/kern_exit.c:493 end trace frame: 0x0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x752dfc144de0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x752dfc144de0, count: -1