uvm_fault(0xfffffd807c24f028, 0xf, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff823ad4d8 cs 8 rflags 10246 cr2 f cpl 0 rsp ffff80003c42c590 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff823ad4d8 Starting stack trace... panic(ffffffff83330381) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c42c4e0) at kerntrap+0x29b sys/arch/amd64/amd64/trap.c:327 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b ktrops(ffff80003b7fc560,ffffffffffffffff,0,a0c7df9f,fffffd805f86f2b8,fffffd807f7d38f0) at ktrops+0x58 ktrcanset sys/kern/kern_ktrace.c:727 [inline] ktrops(ffff80003b7fc560,ffffffffffffffff,0,a0c7df9f,fffffd805f86f2b8,fffffd807f7d38f0) at ktrops+0x58 sys/kern/kern_ktrace.c:570 doktrace(fffffd805f86f2b8,4,20c7df9f,0,ffff80003b7fc560) at doktrace+0x6dd ktrsetchildren sys/kern/kern_ktrace.c:595 [inline] doktrace(fffffd805f86f2b8,4,20c7df9f,0,ffff80003b7fc560) at doktrace+0x6dd sys/kern/kern_ktrace.c:517 sys_ktrace(ffff80003b7fc560,ffff80003c42c8f0,ffff80003c42c840) at sys_ktrace+0x11c sys/kern/kern_ktrace.c:558 syscall(ffff80003c42c8f0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c42c8f0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x908588249f0, count: 249 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 20 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x680 TID PID UID PRFLAGS PFLAGS CPU COMMAND *220062 17201 0 0x10000002 0 1 syz-executor 372938 58201 0 0x14000 0x200 0 reaper savectx() at savectx+0xae end of kernel end trace frame: 0x7d864243c460, 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(0xfffffd807c24f028, 0xf, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7d864243c460, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a3089f0 rbx 0 rdx 0 rcx 0xffff80003b7fb2c8 rax 0x33 r8 0xffff80002a308920 r9 0 r10 0xeae68ad97c4c8c77 r11 0xbdcad70c96adb614 r12 0 r13 0 r14 0xffff80003b7fb2c8 r15 0 rip 0xffffffff8224d3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a308970 ss 0x10 savectx+0xae: movl $0,%gs:0x680 ddb{1}> show proc PROC (syz-executor) tid=220062 pid=17201 tcnt=1 stat=onproc flags process=10000002 proc=0 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003b7fb020,0xffff80003b7fc2c8 process=0xffff8000fffece60 user=0xffff80002a303000, vmspace=0xfffffd807c24fb68 estcpu=34, cpticks=1, pctcpu=0.53, user=3, sys=190, intr=1 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 59532 412360 4217 0 2 0 syz-executor 59532 75409 4217 0 3 0x4000080 fsleep syz-executor 59532 60856 4217 0 3 0x4000080 fsleep syz-executor 59532 402718 4217 0 3 0x4000080 fsleep syz-executor 30498 459964 80380 0 2 0 syz-executor 30498 511653 80380 0 3 0x4000000 sbar syz-executor 95640 327172 99032 0 2 0 syz-executor 95640 179816 99032 0 3 0x4000080 fsleep syz-executor 62542 156429 76282 0 2 0 syz-executor 62542 114286 76282 0 3 0x4000080 fsleep syz-executor 62542 515285 76282 0 3 0x4000080 fsleep syz-executor 81283 45981 0 0 3 0x14200 acct acct 75297 295585 1 0 3 0x100083 ttyin getty 75550 93718 82214 0 3 0x82 nanoslp syz-executor 99032 250768 82214 0 3 0x82 nanoslp syz-executor 80380 302800 82214 0 3 0x82 nanoslp syz-executor 85903 77598 82214 0 2 0x2 syz-executor 76282 60317 82214 0 3 0x82 nanoslp syz-executor 4217 210915 82214 0 3 0x82 nanoslp syz-executor *17201 220062 82214 0 7 0x10000002 syz-executor 44088 311503 0 0 3 0x14200 bored sosplice 90381 327661 82214 0 3 0x82 nanoslp syz-executor 82214 16534 98053 0 3 0x82 kqread syz-executor 98053 408440 44461 0 3 0x10008a sigsusp ksh 44461 38409 52591 0 3 0x98 kqread sshd-session 52591 59526 11537 0 3 0x92 kqread sshd-session 11537 40998 1 0 3 0x88 kqread sshd 15529 50099 38294 74 3 0x1100092 bpf pflogd 38294 341673 1 0 3 0x80 sbwait pflogd 2649 14811 66914 73 3 0x1100010 biowait syslogd 66914 227813 1 0 3 0x100082 sbwait syslogd 94544 136074 1 0 3 0x100080 kqread resolvd 83368 416607 29990 77 3 0x100092 kqread dhcpleased 30206 5905 29990 77 3 0x100092 kqread dhcpleased 29990 153987 1 0 3 0x80 kqread dhcpleased 80690 225117 0 0 3 0x14200 bored smr 47695 81264 0 0 2 0x14200 zerothread 63649 404904 0 0 3 0x14200 aiodoned aiodoned 3594 94629 0 0 3 0x14200 syncer update 2839 249016 0 0 3 0x14200 cleaner cleaner 58201 372938 0 0 7 0x14200 reaper 2229 374096 0 0 3 0x14200 pgdaemon pagedaemon 12861 426450 0 0 3 0x14200 bored viomb 12327 508212 0 0 3 0x40014200 acpi0 acpi0 84710 500442 0 0 3 0x40014200 idle1 19236 497283 0 0 3 0x14200 bored softnet3 89380 2235 0 0 3 0x14200 bored softnet2 13252 318979 0 0 3 0x14200 bored softnet1 18039 250563 0 0 3 0x14200 bored softnet0 26412 286449 0 0 2 0x40014200 systqmp 99698 493357 0 0 3 0x14200 bored systq 83372 302095 0 0 3 0x14200 tmoslp softclockmp 43674 379813 0 0 3 0x40014200 tmoslp softclock 90749 286852 0 0 3 0x40014200 idle0 1 36510 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 (0xffffffff838f3c70) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x178 sys/kern/kern_lock.c:-1 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 uvm_pmr_freepages+0x1a8 sys/uvm/uvm_pmemrange.c:1323 #4 uvm_anfree_list+0x1e3 sys/uvm/uvm_anon.c:120 #5 amap_wipeout+0x248 sys/uvm/uvm_amap.c:502 #6 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 #7 uvm_map_teardown+0x358 sys/uvm/uvm_map.c:2516 #8 uvmspace_free+0xcd sys/uvm/uvm_map.c:3420 #9 reaper+0x246 sys/kern/kern_exit.c:481 #10 proc_trampoline+0x10 Process 30498 (syz-executor) thread 0xffff80003b7fc560 (511653) Process 85903 (syz-executor) thread 0xffff80002a3d0000 (77598) Process 2649 (syslogd) thread 0xffff80002a27cd48 (14811) Process 58201 (reaper) thread 0xffff80002a2382a0 (372938) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10206 11051K 12478K 166960K 16692 0 pcb 17 18K 20K 166960K 891 0 rtable 204 15K 16K 166960K 1225 0 pf 45 19K 83K 166960K 355 0 ifaddr 36 6K 8K 166960K 245 0 ifgroup 64 2K 3K 166960K 393 0 sysctl 4 1K 2K 166960K 13 0 counters 68 36K 38K 166960K 518 0 ioctlops 0 0K 4K 166960K 2496 0 iov 0 0K 24K 166960K 383 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1568 98K 99K 166960K 5260 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 32K 36K 166960K 81 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 163 0 dirhash 12 2K 3K 166960K 90 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 15 53K 236K 166960K 3694 0 sigio 1 0K 0K 166960K 146 0 proc 73 91K 128K 166960K 1229 0 subproc 72 4K 4K 166960K 171 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 834 0 in_multi 53 4K 7K 166960K 428 0 ether_multi 1 0K 0K 166960K 37 0 mrt 1 0K 0K 166960K 16 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 1178 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 250 172K 186K 166960K 33334 0 UVM aobj 13 2K 2K 166960K 15 0 pinsyscall 40 80K 102K 166960K 5064 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 254 0 NDP 14 0K 2K 166960K 177 0 temp 77 8692K 8942K 166960K 132520 0 kqueue 14 22K 30K 166960K 619 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 120 365 0 362 4 3 1 3 0 8 0 rtentry 176 386 0 314 6 2 4 6 0 8 0 unpcb 144 3312 0 3293 19 18 1 6 0 8 0 syncache 336 7 0 7 3 3 0 1 0 8 0 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 808 1288 0 1284 27 25 2 8 0 8 1 arp 128 52 0 34 1 0 1 1 0 8 0 inpcb 384 4547 0 4540 33 30 3 15 0 8 2 nd6 144 91 0 73 2 1 1 2 0 8 0 pkpcb 40 37 0 37 7 6 1 1 0 8 1 kcovpl 48 19 0 11 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 178 0 178 2 1 1 1 0 8 1 pppxif 1504 63 0 63 6 5 1 1 0 8 1 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 57 0 49 1 0 1 1 0 482 0 pffrnode 88 53 0 46 1 0 1 1 0 8 0 pffrent 40 120 0 111 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 10 0 7 1 0 1 1 0 8 0 pfanchor 1288 4 0 0 1 0 1 1 0 8 0 pftag 88 2 0 1 1 0 1 1 0 8 0 pfstitem 24 257 0 161 1 0 1 1 0 8 0 pfstkey 128 261 0 165 4 0 4 4 0 8 0 pfstate 384 258 0 163 11 0 11 11 0 8 0 pfrule 1344 39 0 29 2 1 1 2 0 8 0 art_heap8 4096 4 0 1 4 1 3 3 0 8 0 art_heap4 256 1691 0 1413 34 12 22 29 0 8 0 art_table 32 1695 0 1414 4 1 3 4 0 8 0 art_node 16 376 0 317 1 0 1 1 0 8 0 sysvmsgpl 40 23 0 16 1 0 1 1 0 8 0 semapl 112 161 0 151 1 0 1 1 0 8 0 shmpl 112 12 0 2 1 0 1 1 0 8 0 dirhash 1024 70 0 53 3 0 3 3 0 8 0 dino2pl 256 8214 0 6687 96 0 96 96 0 8 0 ffsino 288 8214 0 6687 110 0 110 110 0 8 0 nchpl 144 13356 0 12805 64 39 25 64 0 8 0 rtmask 32 32 0 32 8 7 1 1 0 8 1 uvmvnodes 80 3246 0 0 67 0 67 67 0 8 0 vnodes 216 3246 0 0 181 0 181 181 0 8 0 namei 1024 51455 0 51455 6 5 1 2 0 8 1 percpumem 16 274 0 225 1 0 1 1 0 8 0 pfiaddrpl 120 2 0 0 1 0 1 1 0 8 0 kstatmem 264 240 0 212 3 0 3 3 0 8 0 acpiwqpl 32 65 0 65 1 0 1 1 1 8 1 scsiplug 72 11 0 11 6 5 1 1 0 8 1 scxspl 216 39022 0 39021 15 13 2 8 1 8 1 plimitpl 152 910 0 892 1 0 1 1 0 8 0 sigapl 424 3987 0 3936 10 3 7 9 0 8 0 futexpl 64 55279 0 55273 1 0 1 1 0 8 0 knotepl 120 838 0 0 23 0 23 23 0 8 0 kqueuepl 224 1473 0 1462 22 17 5 5 0 8 4 pipepl 336 468 0 441 6 3 3 6 0 8 0 fdescpl 520 3937 0 3908 3 0 3 3 0 8 0 filepl 160 30158 0 29937 34 21 13 18 0 8 2 lockfpl 104 1271 0 1269 2 1 1 2 0 8 0 lockfspl 48 422 0 420 1 0 1 1 0 8 0 sessionpl 144 39 0 30 1 0 1 1 0 8 0 pgrppl 48 341 0 324 1 0 1 1 0 8 0 ucredpl 104 6027 0 6013 1 0 1 1 0 8 0 zombiepl 144 3939 0 3936 1 0 1 1 0 8 0 processpl 1216 3987 0 3936 6 1 5 6 0 8 0 procpl 680 9187 0 9127 8 1 7 8 0 8 0 srpgc 96 28 0 28 6 6 0 1 0 8 0 sosppl 168 29 0 29 5 4 1 1 0 8 1 sockpl 728 8332 0 8303 58 53 5 21 0 8 2 mcl64k 65536 4 0 0 1 0 1 1 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 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 129 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 56 0 0 7 0 7 7 0 8 0 mtagpl 96 167 0 0 4 0 4 4 0 8 0 mbufpl 256 1411 0 0 84 0 84 84 0 8 0 bufpl 280 13104 0 6962 440 0 440 440 0 8 0 anonpl 32 12043 0 0 98 1 97 97 0 246 0 amapchunkpl 152 112905 0 112275 50 19 31 31 0 158 4 amappl16 200 6818 0 6663 63 42 21 21 0 8 10 amappl15 192 7 0 7 4 4 0 1 0 8 0 amappl14 184 147 0 133 1 0 1 1 0 8 0 amappl13 176 45 0 45 2 2 0 1 0 8 0 amappl12 168 4754 0 4724 3 1 2 2 0 8 0 amappl11 160 52 0 38 1 0 1 1 0 8 0 amappl10 152 1 0 1 1 1 0 1 0 8 0 amappl9 144 260 0 259 2 1 1 1 0 8 0 amappl8 136 93 0 90 1 0 1 1 0 8 0 amappl7 128 143 0 131 1 0 1 1 0 8 0 amappl6 120 287 0 282 1 0 1 1 0 8 0 amappl5 112 164 0 154 1 0 1 1 0 8 0 amappl4 104 375 0 353 1 0 1 1 0 8 0 amappl3 96 24197 0 24087 5 1 4 4 0 8 0 amappl2 88 819 0 755 2 0 2 2 0 8 0 amappl1 80 24015 0 23417 18 3 15 15 0 8 0 amappl 88 31706 0 31533 5 0 5 5 0 92 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma32768 32768 2 0 2 2 2 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 10 0 10 4 4 0 1 0 8 0 dma128 128 257 0 257 5 5 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 14 0 2 1 0 1 1 0 8 0 uaddrrnd 24 3937 0 3907 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3937 0 3907 1 0 1 1 0 8 0 vmmpekpl 168 27110 0 27039 4 0 4 4 0 8 0 vmmpepl 168 239310 0 237207 132 24 108 108 0 357 8 vmsppl 480 3936 0 3907 6 1 5 5 0 8 0 rwobjpl 72 56971 0 52636 90 6 84 84 0 8 1 pdppl 4096 7881 0 7814 137 66 71 81 0 8 4 pvpl 32 19681 0 0 158 0 158 158 0 265 0 pmappl 256 3936 0 3907 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 558 0 126 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83819ff0) 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 uvmspace_free(fffffd806be473d8) at uvmspace_free+0x3b _atomic_sub_int_nv machine/atomic.h:234 [inline] uvmspace_free(fffffd806be473d8) at uvmspace_free+0x3b sys/uvm/uvm_map.c:3404 reaper(ffff80002a2382a0) at reaper+0x246 sys/kern/kern_exit.c:481 end trace frame: 0x0, count: 10 ddb{0}> trace x86_ipi_db(ffffffff83819ff0) 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 uvmspace_free(fffffd806be473d8) at uvmspace_free+0x3b _atomic_sub_int_nv machine/atomic.h:234 [inline] uvmspace_free(fffffd806be473d8) at uvmspace_free+0x3b sys/uvm/uvm_map.c:3404 reaper(ffff80002a2382a0) at reaper+0x246 sys/kern/kern_exit.c:481 end trace frame: 0x0, count: -5 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x680 savectx() at savectx+0xae end of kernel end trace frame: 0x7d864243c460, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7d864243c460, count: -1