*cpu0: uvm_fault(0xfffffd806bed53d8, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x6048f8d6cb0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c454a90 rbx 0 rdx 0xffff80000147eb00 rcx 0xffff8000ffff19c0 rax 0x39 r8 0xffff80003c4549c0 r9 0x1 r10 0x61cf3f4e5b921ad0 r11 0x1273f1253450de61 r12 0 r13 0 r14 0xffff8000ffff19c0 r15 0 rip 0xffffffff815fd3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c454a10 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=393994 pid=1401 tcnt=5 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=80, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff0020,0xffff8000ffff1740 process=0xffff8000fffed7b0 user=0xffff80003c44f000, vmspace=0xfffffd806bed5978 estcpu=30, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 17687 92332 18279 0 2 0 syz-executor 17687 430923 18279 0 3 0x4000080 fsleep syz-executor 17687 25980 18279 0 3 0x4000080 fsleep syz-executor 23762 155462 24400 0 2 0xc80 syz-executor 23762 52820 24400 0 3 0x4000080 kqsel syz-executor 23762 211809 24400 0 3 0x4000080 fsleep syz-executor 1401 220309 82206 0 2 0 syz-executor 1401 483495 82206 0 3 0x4000080 ttyin syz-executor 1401 471604 82206 0 3 0x4000000 inode syz-executor 1401 301278 82206 0 3 0x4000000 inode syz-executor * 1401 393994 82206 0 7 0x4000000 syz-executor 4697 283548 94757 0 3 0x80 nanoslp syz-executor 4697 248475 94757 0 3 0x4000080 msgwait syz-executor 4697 371183 94757 0 3 0x4000080 fsleep syz-executor 89836 112816 97087 0 2 0xc80 syz-executor 89836 331657 97087 0 3 0x4000080 kqsel syz-executor 89836 403207 97087 0 3 0x4000080 fsleep syz-executor 89836 404503 97087 0 3 0x4000080 fsleep syz-executor 59496 467417 0 0 3 0x14200 acct acct 97087 28673 44161 0 2 0xc82 syz-executor 18279 414118 44161 0 2 0xc82 syz-executor 90353 49652 0 0 3 0x14200 bored sosplice 94757 115023 44161 0 2 0xc82 syz-executor 24400 450234 44161 0 2 0xc82 syz-executor 82206 313592 44161 0 2 0xc82 syz-executor 42722 266267 44161 0 3 0x82 wait syz-executor 79203 424862 44161 0 2 0x2 syz-executor 18981 446114 44161 0 2 0xc82 syz-executor 44161 133243 70769 0 3 0x82 kqread syz-executor 70769 524209 58021 0 3 0x10008a sigsusp ksh 58021 66318 53564 0 3 0x98 kqread sshd-session 53564 224595 85190 0 3 0x92 kqread sshd-session 3499 468048 1 0 3 0x100083 ttyin getty 85190 516116 1 0 3 0x88 kqread sshd 43753 434406 34175 74 3 0x1100092 bpf pflogd 34175 226950 1 0 3 0x80 sbwait pflogd 52654 101354 16539 73 3 0x1100090 kqread syslogd 16539 386841 1 0 3 0x100082 sbwait syslogd 14175 6373 1 0 3 0x100080 kqread resolvd 9523 331666 51829 77 3 0x100092 kqread dhcpleased 45861 278307 51829 77 3 0x100092 kqread dhcpleased 51829 233210 1 0 3 0x80 kqread dhcpleased 84844 295344 0 0 3 0x14200 bored smr 68929 155406 0 0 3 0x14200 pgzero zerothread 126 38093 0 0 3 0x14200 aiodoned aiodoned 55062 149628 0 0 3 0x14200 syncer update 85553 470234 0 0 3 0x14200 cleaner cleaner 19010 408726 0 0 3 0x14200 reaper reaper 13936 434158 0 0 3 0x14200 pgdaemon pagedaemon 55285 66365 0 0 3 0x14200 bored viomb 15541 413867 0 0 3 0x40014200 acpi0 acpi0 23369 442528 0 0 3 0x40014200 idle1 89448 36753 0 0 3 0x14200 bored softnet3 18825 31675 0 0 3 0x14200 bored softnet2 64916 260422 0 0 3 0x14200 bored softnet1 8051 392067 0 0 3 0x14200 bored softnet0 99540 359730 0 0 3 0x14200 bored systqmp 47736 358292 0 0 3 0x14200 bored systq 22431 245680 0 0 3 0x14200 tmoslp softclockmp 10508 464859 0 0 2 0x40014200 softclock 2419 440558 0 0 3 0x40014200 idle0 1 10574 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 (0xffffffff838fd420) #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 sleep_finish+0x24f sys/kern/kern_synch.c:412 #4 sys_futex+0xa58 futex_wait sys/kern/sys_futex.c:304 [inline] #4 sys_futex+0xa58 sys/kern/sys_futex.c:152 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 #6 Xsyscall+0x128 Process 1401 (syz-executor) thread 0xffff8000333ea7d8 (483495) exclusive rrwlock inode r = 0 (0xfffffd806c58e200) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 spec_open+0x305 sys/kern/spec_vnops.c:151 #6 VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 #7 vn_open+0x708 sys/kern/vfs_vnops.c:177 #8 vndioctl+0xcb1 sys/dev/vnd.c:457 #9 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #10 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #11 sys_ioctl+0x5c3 sys/kern/sys_generic.c:-1 #12 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 #13 Xsyscall+0x128 Process 1401 (syz-executor) thread 0xffff8000ffff0f80 (301278) exclusive rrwlock inode r = 0 (0xfffffd806ba342e0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 domknodat+0xb4 sys/kern/vfs_syscalls.c:1588 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10213 11151K 11511K 166960K 11994 0 pcb 17 14K 15K 166960K 113 0 rtable 208 7K 8K 166960K 437 0 pf 32 17K 21K 166960K 83 0 ifaddr 39 6K 7K 166960K 65 0 ifgroup 51 2K 2K 166960K 90 0 sysctl 2 1K 9K 166960K 8 0 counters 64 36K 37K 166960K 98 0 ioctlops 0 0K 4K 166960K 1594 0 iov 0 0K 16K 166960K 17 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1347 85K 85K 166960K 1737 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 20 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 240K 166960K 480 0 sigio 0 0K 0K 166960K 2 0 proc 72 91K 128K 166960K 613 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 43 0 in_multi 88 6K 7K 166960K 133 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 408 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 253 173K 178K 166960K 5759 0 UVM aobj 14 2K 2K 166960K 16 0 pinsyscall 42 84K 108K 166960K 1597 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 10 0 NDP 11 0K 2K 166960K 43 0 temp 50 8677K 8804K 166960K 22539 0 kqueue 13 20K 30K 166960K 98 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 52 0 49 1 0 1 1 0 8 0 rtentry 176 143 0 49 6 0 6 6 0 8 0 unpcb 144 585 0 565 6 1 5 6 0 8 4 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 808 77 0 72 2 0 2 2 0 8 1 arp 128 25 0 7 1 0 1 1 0 8 0 inpcb 384 449 0 435 9 4 5 9 0 8 3 nd6 144 33 0 9 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1192 11 0 11 1 0 1 1 0 8 1 pffrag 232 3 0 0 1 0 1 1 0 482 0 pffrnode 88 3 0 0 1 0 1 1 0 8 0 pffrent 40 3 0 0 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 3 0 3 1 1 0 1 0 8 0 pfstitem 24 39 0 0 1 0 1 1 0 8 0 pfstkey 128 39 0 0 2 0 2 2 0 8 0 pfstate 384 39 0 0 4 0 4 4 0 8 0 pfrule 1344 25 0 19 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 617 0 206 31 2 29 31 0 8 1 art_table 32 618 0 206 4 0 4 4 0 8 0 art_node 16 142 0 57 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 5 2 1 1 1 0 8 0 semapl 112 18 0 8 1 0 1 1 0 8 0 shmpl 112 13 0 2 1 0 1 1 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 2239 0 725 96 0 96 96 0 8 0 ffsino 288 2239 0 725 109 0 109 109 0 8 0 nchpl 144 2813 0 1113 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 1 0 1 0 8 0 uvmvnodes 80 2487 0 0 51 0 51 51 0 8 0 vnodes 216 2487 0 0 139 0 139 139 0 8 0 namei 1024 9304 0 9303 2 1 1 2 0 8 0 percpumem 16 64 0 17 1 0 1 1 0 8 0 kstatmem 264 48 0 24 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 11066 0 11066 10 2 8 8 1 8 8 plimitpl 152 56 0 36 1 0 1 1 0 8 0 sigapl 424 764 0 713 7 0 7 7 0 8 1 knotepl 120 308 0 0 10 0 10 10 0 8 0 kqueuepl 224 197 0 184 4 1 3 3 0 8 2 pipepl 336 135 0 107 3 0 3 3 0 8 0 fdescpl 520 743 0 712 3 0 3 3 0 8 0 filepl 160 4127 0 3830 17 2 15 17 0 8 2 lockfpl 104 159 0 156 1 0 1 1 0 8 0 lockfspl 48 62 0 59 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 36 0 19 1 0 1 1 0 8 0 ucredpl 104 626 0 612 1 0 1 1 0 8 0 zombiepl 144 715 0 713 1 0 1 1 0 8 0 processpl 1208 764 0 713 5 0 5 5 0 8 0 procpl 656 1281 0 1217 6 0 6 6 0 8 0 srpgc 96 6 0 6 2 1 1 1 0 8 1 sosppl 168 2 0 2 1 1 0 1 0 8 0 sockpl 728 1097 0 1062 19 9 10 16 0 8 5 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 125 0 0 16 0 16 16 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mtagpl 96 9 0 0 1 0 1 1 0 8 0 mbufpl 256 189 0 0 12 0 12 12 0 8 0 bufpl 280 4097 0 189 280 0 280 280 0 8 0 anonpl 32 11048 0 0 90 0 90 90 0 246 0 amapchunkpl 152 17785 0 17263 29 2 27 27 0 158 4 amappl16 200 2932 0 2904 27 13 14 26 0 8 8 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 120 0 108 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 1416 0 1385 4 2 2 3 0 8 0 amappl11 160 76 0 62 1 0 1 1 0 8 0 amappl10 152 4 0 4 1 1 0 1 0 8 0 amappl9 144 257 0 257 1 1 0 1 0 8 0 amappl8 136 26 0 21 1 0 1 1 0 8 0 amappl7 128 106 0 94 1 0 1 1 0 8 0 amappl6 120 195 0 191 1 0 1 1 0 8 0 amappl5 112 127 0 118 1 0 1 1 0 8 0 amappl4 104 316 0 297 1 0 1 1 0 8 0 amappl3 96 3351 0 3235 5 1 4 4 0 8 0 amappl2 88 649 0 589 2 0 2 2 0 8 0 amappl1 80 9598 0 8996 16 3 13 15 0 8 0 amappl 88 4994 0 4816 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 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 7 0 7 2 1 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 15 0 2 1 0 1 1 0 8 0 uaddrrnd 24 743 0 712 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 743 0 712 1 0 1 1 0 8 0 vmmpekpl 168 7419 0 7373 3 0 3 3 0 8 0 vmmpepl 168 52817 0 50829 108 1 107 108 0 357 14 vmsppl 480 742 0 712 5 0 5 5 0 8 0 rwobjpl 72 19315 0 15871 63 0 63 63 0 8 0 pdppl 4096 1494 0 1424 104 30 74 88 0 8 4 pvpl 32 19260 0 0 157 1 156 157 0 265 0 pmappl 256 742 0 712 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 392 0 36 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83876ff0) 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 x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:666 acpitimer_delay(1) at acpitimer_delay+0x194 acpitimer_read sys/dev/acpi/acpitimer.c:142 [inline] acpitimer_delay(1) at acpitimer_delay+0x194 sys/dev/acpi/acpitimer.c:125 comcnputc(800,3a) at comcnputc+0x11a sys/dev/ic/com.c:1259 cnputc(3a) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(3a) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x843 sys/kern/subr_prf.c:-1 db_printf(ffffffff8337c6d0) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80002a304700) at db_ktrap+0x101 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80002a304700) at db_ktrap+0x101 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80002a304700) at kerntrap+0x1dc sys/arch/amd64/amd64/trap.c:323 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000148f000) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:579 end trace frame: 0xffff80002a304830, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83876ff0) 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 x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:666 acpitimer_delay(1) at acpitimer_delay+0x194 acpitimer_read sys/dev/acpi/acpitimer.c:142 [inline] acpitimer_delay(1) at acpitimer_delay+0x194 sys/dev/acpi/acpitimer.c:125 comcnputc(800,3a) at comcnputc+0x11a sys/dev/ic/com.c:1259 cnputc(3a) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(3a) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x843 sys/kern/subr_prf.c:-1 db_printf(ffffffff8337c6d0) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80002a304700) at db_ktrap+0x101 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80002a304700) at db_ktrap+0x101 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80002a304700) at kerntrap+0x1dc sys/arch/amd64/amd64/trap.c:323 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000148f000) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:579 dtclose(21e5f,1,2000,ffff8000ffff0cf0) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,1,2000,ffff8000ffff0cf0) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002a3048b0) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e6e9dc0,1,fffffd807f7d36e8,ffff8000ffff0cf0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c120480,ffff8000ffff0cf0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c120480,ffff8000ffff0cf0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c120480,ffff8000ffff0cf0) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806c120480,ffff8000ffff0cf0) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff8000ffff0cf0) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff8000ffff0cf0,0,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff8000ffff0cf0,ffff80002a304c20,ffff80002a304b70) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a304c20) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a304c20) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74f2ca9cc400, count: -25 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x6048f8d6cb0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x6048f8d6cb0, count: -1