*cpu0: uvm_fault(0xfffffd806b7f7d78, 0x15040, 0, 2) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x71e367793850, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c4395a0 rbx 0 rdx 0 rcx 0xffff80002a35f500 rax 0x3b r8 0xffff80003c4394d0 r9 0x1 r10 0xf262420278ffe986 r11 0x628679f53db174a0 r12 0 r13 0 r14 0xffff80002a35f500 r15 0 rip 0xffffffff813283ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c439520 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=304332 pid=15647 tcnt=3 stat=onproc flags process=0 proc=0 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c470d30,0xffff80002a35e050 process=0xffff80003c4e0e98 user=0xffff80003c434000, vmspace=0xfffffd806ef63b78 estcpu=36, cpticks=3, pctcpu=0.0, user=3, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 36026 397054 69950 0 2 0 syz-executor 36026 446463 69950 0 7 0x4000000 syz-executor 28859 282140 48464 0 2 0 syz-executor 28859 342982 48464 0 3 0x4000080 fsleep syz-executor 22175 295330 76334 0 2 0 syz-executor 22175 28088 76334 0 2 0x4000000 syz-executor *15647 304332 56747 0 7 0 syz-executor 15647 94035 56747 0 2 0x4000c80 syz-executor 15647 313030 56747 0 3 0x4000080 fsleep syz-executor 3494 159696 43093 0 2 0xc80 syz-executor 3494 274917 43093 0 3 0x4000080 lockf syz-executor 3494 430525 43093 0 3 0x4000080 fsleep syz-executor 65580 102394 4990 0 2 0xc80 syz-executor 65580 210038 4990 0 3 0x4000080 pppxread syz-executor 65580 377740 4990 0 3 0x4000080 fsleep syz-executor 43093 434079 2317 0 2 0xc82 syz-executor 48464 203755 2317 0 3 0x82 nanoslp syz-executor 4990 92317 2317 0 2 0xc82 syz-executor 59222 450026 0 0 3 0x14200 bored sosplice 69950 495574 2317 0 2 0x2 syz-executor 99680 311540 2317 0 3 0x82 wait syz-executor 56747 246724 2317 0 2 0xc82 syz-executor 71601 68086 2317 0 2 0xc82 syz-executor 76334 372549 2317 0 2 0xc82 syz-executor 2317 138631 43984 0 3 0x82 kqread syz-executor 43984 212091 27387 0 3 0x10008a sigsusp ksh 27387 467691 75382 0 3 0x98 kqread sshd-session 75382 352208 63587 0 3 0x92 kqread sshd-session 23202 372630 1 0 3 0x100083 ttyopn getty 63587 256985 1 0 3 0x88 kqread sshd 79684 480113 13911 74 3 0x1100092 bpf pflogd 13911 339635 1 0 3 0x80 sbwait pflogd 86907 512811 96491 73 3 0x1100090 kqread syslogd 96491 441632 1 0 3 0x100082 sbwait syslogd 5528 380896 1 0 3 0x100080 kqread resolvd 42558 433554 95468 77 3 0x100092 kqread dhcpleased 91121 111733 95468 77 3 0x100092 kqread dhcpleased 95468 503881 1 0 3 0x80 kqread dhcpleased 83433 100648 0 0 3 0x14200 bored smr 92105 408750 0 0 2 0x14200 zerothread 44120 323323 0 0 3 0x14200 aiodoned aiodoned 12481 392144 0 0 3 0x14200 syncer update 62876 162410 0 0 3 0x14200 cleaner cleaner 6858 186600 0 0 3 0x14200 reaper reaper 14456 420576 0 0 3 0x14200 pgdaemon pagedaemon 10597 156388 0 0 3 0x14200 bored viomb 57236 273365 0 0 3 0x40014200 acpi0 acpi0 28519 385853 0 0 3 0x40014200 idle1 64512 170528 0 0 3 0x14200 bored softnet7 87393 381046 0 0 3 0x14200 bored softnet6 3081 165651 0 0 3 0x14200 bored softnet5 18725 498105 0 0 3 0x14200 bored softnet4 38104 369773 0 0 3 0x14200 bored softnet3 34718 266884 0 0 3 0x14200 bored softnet2 32659 332531 0 0 3 0x14200 bored softnet1 26619 408009 0 0 2 0x14200 softnet0 51341 48852 0 0 3 0x14200 smrbar systqmp 64781 214739 0 0 3 0x14200 bored systq 67303 114248 0 0 3 0x14200 tmoslp softclockmp 50260 465185 0 0 2 0x40014200 softclock 82097 207355 0 0 3 0x40014200 idle0 1 495718 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff8391bda0) #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 preempt+0x35 sys/kern/sched_bsd.c:340 #4 ast+0x15a mi_ast sys/sys/syscall_mi.h:252 [inline] #4 ast+0x15a sys/arch/amd64/amd64/trap.c:710 #5 Xsyscall+0x156 Process 22175 (syz-executor) thread 0xffff80003c471a28 (28088) Process 51341 (systqmp) thread 0xffff8000ffffe000 (48852) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10263 11136K 11621K 166960K 13346 0 pcb 17 16K 18K 166960K 903 0 rtable 170 12K 12K 166960K 806 0 pf 40 18K 131090K 166960K 388 0 ifaddr 34 6K 8K 166960K 232 0 ifgroup 68 2K 3K 166960K 484 0 sysctl 4 1K 9K 166960K 35 0 counters 72 37K 39K 166960K 522 0 ioctlops 0 0K 4K 166960K 2280 0 iov 0 0K 32K 166960K 332 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1448 91K 91K 166960K 3509 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 5K 9K 166960K 42 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 226 0 dirhash 12 2K 2K 166960K 75 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 2863 0 sigio 0 0K 0K 166960K 59 0 proc 72 115K 164K 166960K 843 0 subproc 72 4K 4K 166960K 101 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 593 0 in_multi 52 4K 6K 166960K 281 0 ether_multi 2 0K 0K 166960K 42 0 mrt 3 0K 0K 166960K 20 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 1081 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 8 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 259 161K 186K 166960K 27469 0 UVM aobj 14 2K 2K 166960K 14 0 pinsyscall 43 86K 101K 166960K 4114 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 228 0 NDP 14 0K 1K 166960K 181 0 temp 80 8652K 8724K 166960K 99640 0 kqueue 14 20K 32K 166960K 617 0 SYN cache 2 0K 16K 166960K 4 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 120 400 0 397 4 3 1 3 0 8 0 rtentry 176 253 0 199 4 0 4 4 0 8 0 unpcb 144 2348 0 2324 11 9 2 4 0 8 1 syncache 336 24 0 24 5 4 1 1 0 8 1 tcpqe 32 3 0 3 2 1 1 1 0 8 1 tcpcb 736 1259 0 1251 20 16 4 7 0 8 3 arp 128 21 0 9 1 0 1 1 0 8 0 inpcb 328 4070 0 4058 29 20 9 12 0 8 7 nd6 144 29 0 20 1 0 1 1 0 8 0 pkpcb 40 66 0 66 4 3 1 1 0 8 1 kcovpl 48 11 0 3 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 176 0 176 3 2 1 1 0 8 1 pppxif 1504 16 0 16 5 4 1 1 0 8 1 pffrag 232 22 0 12 1 0 1 1 0 482 0 pffrnode 88 17 0 9 1 0 1 1 0 8 0 pffrent 40 36 0 24 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 3 0 3 3 3 0 1 0 8 0 pfstitem 24 226 0 99 1 0 1 1 0 8 0 pfstkey 128 226 0 99 5 0 5 5 0 8 0 pfstate 384 226 0 99 13 0 13 13 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 4 0 4 4 3 1 1 0 8 1 art_heap8 4096 7 0 2 7 2 5 6 0 8 0 art_heap4 256 971 0 728 31 9 22 28 0 8 0 art_table 40 978 0 730 5 0 5 5 0 8 0 art_node 32 248 0 199 2 1 1 2 0 8 0 sysvmsgpl 40 23 0 15 1 0 1 1 0 8 0 semupl 112 3 0 3 2 2 0 1 0 8 0 semapl 112 219 0 209 1 0 1 1 0 8 0 shmpl 112 11 0 0 1 0 1 1 0 8 0 dirhash 1024 61 0 44 3 0 3 3 0 8 0 dino2pl 256 7203 0 5689 95 0 95 95 0 8 0 ffsino 296 7203 0 5689 117 0 117 117 0 8 0 nchpl 144 11295 0 10729 64 39 25 64 0 8 0 rtmask 32 43 0 43 6 5 1 1 0 8 1 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 40613 0 40613 3 2 1 2 0 8 1 percpumem 16 276 0 225 1 0 1 1 0 8 0 kstatmem 264 322 0 288 3 0 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 10 0 10 6 5 1 1 0 8 1 scxspl 216 58827 0 58827 18 16 2 8 1 8 2 plimitpl 152 963 0 944 1 0 1 1 0 8 0 sigapl 424 3345 0 3290 9 1 8 9 0 8 0 knotepl 120 625 0 0 18 0 18 18 0 8 0 kqueuepl 224 1150 0 1140 7 6 1 5 0 8 0 pipepl 344 457 0 430 12 9 3 9 0 8 0 fdescpl 528 3156 0 3124 3 0 3 3 0 8 0 filepl 160 23745 0 23504 32 16 16 18 0 8 4 lockfpl 104 989 0 985 1 0 1 1 0 8 0 lockfspl 48 385 0 382 1 0 1 1 0 8 0 sessionpl 144 44 0 35 1 0 1 1 0 8 0 pgrppl 48 85 0 68 1 0 1 1 0 8 0 ucredpl 104 4492 0 4479 1 0 1 1 0 8 0 zombiepl 144 3292 0 3290 1 0 1 1 0 8 0 processpl 1232 3345 0 3290 6 0 6 6 0 8 0 procpl 664 8122 0 8058 10 3 7 8 0 8 1 sosppl 168 8 0 8 4 3 1 1 0 8 1 sockpl 752 6954 0 6915 48 36 12 18 0 8 7 mcl64k 65536 11 0 0 2 0 2 2 0 8 0 mcl16k 16384 8 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 9 0 0 2 0 2 2 0 8 0 mcl4k 4096 130 0 0 17 0 17 17 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 61 0 0 7 1 6 7 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 1223 0 0 72 0 72 72 0 8 0 bufpl 280 23501 0 17358 440 1 439 440 0 8 0 anonpl 32 12335 0 0 99 0 99 99 0 246 0 amapchunkpl 152 97233 0 96667 63 32 31 37 0 158 8 amappl16 200 10416 0 10364 57 41 16 24 0 8 5 amappl15 192 42 0 42 4 4 0 1 0 8 0 amappl14 184 158 0 146 1 0 1 1 0 8 0 amappl13 176 2 0 2 2 2 0 1 0 8 0 amappl12 168 3864 0 3832 3 1 2 2 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 7 0 7 1 1 0 1 0 8 0 amappl9 144 252 0 252 1 1 0 1 0 8 0 amappl8 136 26 0 22 1 0 1 1 0 8 0 amappl7 128 176 0 163 1 0 1 1 0 8 0 amappl6 120 289 0 285 1 0 1 1 0 8 0 amappl5 112 138 0 128 1 0 1 1 0 8 0 amappl4 104 396 0 376 1 0 1 1 0 8 0 amappl3 96 17186 0 17075 4 1 3 3 0 8 0 amappl2 88 3539 0 3459 3 0 3 3 0 8 0 amappl1 80 24022 0 23412 18 0 18 18 0 8 1 amappl 88 26132 0 25948 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma8192 8192 2 0 2 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 256 0 256 4 3 1 1 0 8 1 dma64 64 8 0 8 2 2 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 13 0 0 1 0 1 1 0 8 0 uaddrrnd 24 3156 0 3124 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3156 0 3124 1 0 1 1 0 8 0 vmmpekpl 168 27437 0 27382 3 0 3 3 0 8 0 vmmpepl 168 206186 0 204075 128 19 109 109 0 357 5 vmsppl 488 3155 0 3124 6 1 5 5 0 8 0 rwobjpl 80 59918 0 52986 155 7 148 150 0 8 1 pdppl 4096 6320 0 6248 132 56 76 86 0 8 4 pvpl 32 20663 0 0 168 1 167 167 0 265 0 pmappl 256 3155 0 3124 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 406 0 95 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8377fff0) 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(ffffffff838fa878) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838fa878) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 cnputc(3a) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(3a) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x203 sys/kern/subr_prf.c:723 db_printf(ffffffff833fbf56) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,2,ffff80003c49f240) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,2,ffff80003c49f240) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c49f240) at kerntrap+0x23e sys/arch/amd64/amd64/trap.c:480 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b end trace frame: 0xffff80003c49f5a0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff8377fff0) 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(ffffffff838fa878) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838fa878) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 cnputc(3a) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(3a) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x203 sys/kern/subr_prf.c:723 db_printf(ffffffff833fbf56) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,2,ffff80003c49f240) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,2,ffff80003c49f240) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c49f240) at kerntrap+0x23e sys/arch/amd64/amd64/trap.c:480 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x57 syscall(ffff80003c49f680) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c49f680) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3392282ecf0, count: -17 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x71e367793850, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x71e367793850, count: -1