*cpu0: uvm_fault(0xfffffd806b65a3e0, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7cbab7f85660, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c43c7a0 rbx 0 rdx 0 rcx 0xffff8000ffff0a60 rax 0x3a r8 0xffff80003c43c6d0 r9 0 r10 0x3e8b9f1f2de9aba5 r11 0xc9f8748a31f0bc53 r12 0 r13 0 r14 0xffff8000ffff0a60 r15 0 rip 0xffffffff82cac3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c43c720 ss 0x10 savectx+0xae: movl $0,%gs:0x680 ddb{1}> show proc PROC (syz-executor) tid=351765 pid=16606 tcnt=3 stat=onproc flags process=0 proc=0 runpri=50, usrpri=50, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff14a0,0xffff8000ffff0030 process=0xffff8000fffece40 user=0xffff80003c437000, vmspace=0xfffffd806b65a3e0 estcpu=36, cpticks=1, pctcpu=0.0, user=1, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 57274 309571 48321 0 2 0 syz-executor *16606 351765 68820 0 7 0 syz-executor 16606 371114 68820 0 7 0x4000000 syz-executor 16606 367623 68820 0 3 0x4000080 fsleep syz-executor 42064 34587 20929 0 2 0 syz-executor 42064 127741 20929 0 3 0x4000080 pipewr syz-executor 91590 393752 82571 0 3 0x90 nanoslp syz-executor 91590 34702 82571 0 3 0x4000090 sbwait syz-executor 91590 246943 82571 0 3 0x4000090 kqread syz-executor 91590 137211 82571 0 3 0x4000090 fsleep syz-executor 20431 434798 1 0 3 0x82 nanoslp getty 56926 196456 0 0 3 0x14200 bored sosplice 48321 65602 49489 0 2 0xc82 syz-executor 68754 441649 49489 0 2 0xc82 syz-executor 85762 169881 49489 0 3 0x82 nanoslp syz-executor 20929 178827 49489 0 3 0x82 nanoslp syz-executor 82571 389023 49489 0 3 0x82 nanoslp syz-executor 98059 511408 49489 0 2 0x2 syz-executor 68820 422842 49489 0 2 0xc82 syz-executor 20258 472732 49489 0 3 0x82 nanoslp syz-executor 49489 17659 71449 0 3 0x82 kqread syz-executor 71449 460661 72735 0 3 0x10008a sigsusp ksh 72735 417468 20322 0 3 0x98 kqread sshd-session 20322 297574 15939 0 3 0x92 kqread sshd-session 15939 161286 1 0 3 0x88 kqread sshd 16615 20109 20934 74 3 0x1100092 bpf pflogd 20934 18280 1 0 3 0x80 sbwait pflogd 88838 13872 23512 73 3 0x1100090 kqread syslogd 23512 333301 1 0 3 0x100082 sbwait syslogd 55471 265666 1 0 3 0x100080 kqread resolvd 71018 205011 7628 77 3 0x100092 kqread dhcpleased 82859 42202 7628 77 3 0x100092 kqread dhcpleased 7628 428321 1 0 3 0x80 kqread dhcpleased 80179 493118 0 0 3 0x14200 bored smr 67444 512944 0 0 2 0x14200 zerothread 1192 260815 0 0 3 0x14200 aiodoned aiodoned 81313 42998 0 0 3 0x14200 syncer update 36035 433615 0 0 3 0x14200 cleaner cleaner 71934 84978 0 0 3 0x14200 reaper reaper 11666 90737 0 0 3 0x14200 pgdaemon pagedaemon 62924 175618 0 0 3 0x14200 bored viomb 85934 150912 0 0 3 0x40014200 acpi0 acpi0 25130 283398 0 0 3 0x40014200 idle1 13583 7031 0 0 3 0x14200 bored softnet3 28452 266000 0 0 3 0x14200 bored softnet2 6310 424756 0 0 3 0x14200 bored softnet1 59345 169106 0 0 3 0x14200 bored softnet0 40189 219318 0 0 3 0x14200 bored systqmp 21028 329206 0 0 3 0x14200 bored systq 9362 72854 0 0 3 0x14200 tmoslp softclockmp 706 168759 0 0 2 0x40014200 softclock 73136 418407 0 0 3 0x40014200 idle0 1 389852 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &map->flags_lock r = 0 (0xfffffd806b65a550) #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 vm_map_lock_ln+0x66 sys/uvm/uvm_map.c:5237 #4 uvm_map_protect+0xe1 sys/uvm/uvm_map.c:3057 #5 sys_mprotect+0x34c sys/uvm/uvm_mmap.c:590 #6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 #7 Xsyscall+0x128 Process 16606 (syz-executor) thread 0xffff8000ffff0020 (371114) exclusive rwlock dtlk r = 0 (0xffffffff8388eb48) #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 dt_ioctl_record_stop+0x68 sys/dev/dt/dt_dev.c:-1 #3 dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] #3 dtclose+0x105 sys/dev/dt/dt_dev.c:232 #4 spec_close+0x45f sys/kern/spec_vnops.c:-1 #5 VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 #6 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #6 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #7 fdrop+0x126 sys/kern/kern_descrip.c:1267 #8 closef+0x192 sys/kern/kern_descrip.c:1251 #9 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 #10 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838c6a00) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 vn_closefile+0x41 sys/kern/vfs_vnops.c:608 #2 fdrop+0x126 sys/kern/kern_descrip.c:1267 #3 closef+0x192 sys/kern/kern_descrip.c:1251 #4 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 #5 Xsyscall+0x128 Process 98059 (syz-executor) thread 0xffff80002a2a4f78 (511408) exclusive rrwlock inode r = 0 (0xfffffd806b7592e0) #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 vget+0x2bd sys/kern/vfs_subr.c:693 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b759ac0) #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 vget+0x2bd sys/kern/vfs_subr.c:693 #6 cache_lookup+0x36e sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x21b sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #10 namei+0x7aa sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #12 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #13 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10215 11058K 11419K 166960K 11553 0 pcb 17 13K 14K 166960K 95 0 rtable 206 8K 8K 166960K 394 0 pf 41 18K 21K 166960K 67 0 ifaddr 42 7K 7K 166960K 55 0 ifgroup 63 2K 2K 166960K 77 0 sysctl 2 1K 1K 166960K 2 0 counters 70 37K 37K 166960K 82 0 ioctlops 0 0K 4K 166960K 1502 0 iov 1 2K 12K 166960K 11 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1349 85K 85K 166960K 1541 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 317 0 sigio 0 0K 0K 166960K 3 0 proc 75 103K 152K 166960K 571 0 subproc 72 4K 4K 166960K 76 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 22 0 in_multi 88 6K 7K 166960K 108 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 2 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 387 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 239 167K 180K 166960K 4627 0 UVM aobj 13 2K 2K 166960K 16 0 pinsyscall 42 84K 104K 166960K 1414 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 6 0 NDP 14 0K 2K 166960K 34 0 temp 44 8664K 8739K 166960K 11104 0 kqueue 14 22K 26K 166960K 56 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 43 0 40 1 0 1 1 0 8 0 rtentry 176 118 0 28 6 0 6 6 0 8 0 unpcb 144 140 0 121 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 808 56 0 51 2 0 2 2 0 8 1 arp 128 19 0 4 1 0 1 1 0 8 0 inpcb 384 245 0 234 5 0 5 5 0 8 3 nd6 144 26 0 3 1 0 1 1 0 8 0 pkpcb 40 6 0 6 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 4 0 4 1 0 1 1 0 8 1 pfstscr 40 2 0 2 1 0 1 1 0 8 1 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 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 pfrktable 1344 1 0 0 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 28 0 0 1 0 1 1 0 8 0 pfstkey 128 29 0 1 1 0 1 1 0 8 0 pfstate 384 29 0 1 3 0 3 3 0 8 0 pfrule 1344 23 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 493 0 89 29 0 29 29 0 8 1 art_table 32 494 0 89 4 0 4 4 0 8 0 art_node 16 116 0 35 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 2 1 0 1 1 0 8 0 semapl 112 4 0 1 1 0 1 1 0 8 0 shmpl 112 13 0 3 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1933 0 422 95 0 95 95 0 8 0 ffsino 288 1933 0 422 109 0 109 109 0 8 0 nchpl 144 2401 0 711 63 0 63 63 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 uvmvnodes 80 2104 0 0 43 0 43 43 0 8 0 vnodes 216 2104 0 0 117 0 117 117 0 8 0 namei 1024 7474 0 7474 1 0 1 1 0 8 1 percpumem 16 56 0 6 1 0 1 1 0 8 0 kstatmem 264 40 0 8 3 0 3 3 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 7721 0 7721 9 1 8 8 1 8 8 plimitpl 152 49 0 32 1 0 1 1 0 8 0 sigapl 424 621 0 571 7 0 7 7 0 8 1 knotepl 120 310 0 0 10 0 10 10 0 8 0 kqueuepl 224 146 0 133 5 0 5 5 0 8 4 pipepl 336 117 0 89 3 0 3 3 0 8 0 fdescpl 520 602 0 571 3 0 3 3 0 8 0 filepl 160 2812 0 2583 15 0 15 15 0 8 5 lockfpl 104 65 0 63 1 0 1 1 0 8 0 lockfspl 48 26 0 24 1 0 1 1 0 8 0 sessionpl 144 23 0 15 1 0 1 1 0 8 0 pgrppl 48 34 0 18 1 0 1 1 0 8 0 ucredpl 104 383 0 368 1 0 1 1 0 8 0 zombiepl 144 574 0 571 1 0 1 1 0 8 0 processpl 1208 621 0 571 5 0 5 5 0 8 1 procpl 656 922 0 866 6 0 6 6 0 8 0 srpgc 96 2 0 2 1 0 1 1 0 8 1 sockpl 728 435 0 402 7 0 7 7 0 8 3 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 123 0 0 16 0 16 16 0 8 0 mcl2k 2048 17 0 0 3 0 3 3 0 8 0 mtagpl 96 16 0 0 1 0 1 1 0 8 0 mbufpl 256 162 0 0 11 0 11 11 0 8 0 bufpl 280 2695 0 127 184 0 184 184 0 8 0 anonpl 32 5620 0 0 46 0 46 46 0 246 0 amapchunkpl 152 13745 0 13264 27 0 27 27 0 158 7 amappl16 200 2095 0 2064 5 3 2 5 0 8 0 amappl15 192 8 0 7 1 0 1 1 0 8 0 amappl14 184 148 0 136 1 0 1 1 0 8 0 amappl13 176 32 0 32 1 1 0 1 0 8 0 amappl12 168 1244 0 1213 3 1 2 2 0 8 0 amappl11 160 48 0 34 1 0 1 1 0 8 0 amappl10 152 25 0 25 1 1 0 1 0 8 0 amappl9 144 248 0 248 1 1 0 1 0 8 0 amappl8 136 33 0 31 1 0 1 1 0 8 0 amappl7 128 109 0 96 1 0 1 1 0 8 0 amappl6 120 174 0 171 1 0 1 1 0 8 0 amappl5 112 125 0 115 1 0 1 1 0 8 0 amappl4 104 322 0 302 1 0 1 1 0 8 0 amappl3 96 2459 0 2348 5 1 4 4 0 8 1 amappl2 88 652 0 588 2 0 2 2 0 8 0 amappl1 80 9067 0 8465 15 0 15 15 0 8 1 amappl 88 3903 0 3738 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 6 0 6 1 1 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 15 0 3 1 0 1 1 0 8 0 uaddrrnd 24 602 0 571 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 602 0 571 1 0 1 1 0 8 0 vmmpekpl 168 6558 0 6519 2 0 2 2 0 8 0 vmmpepl 168 44336 0 42366 92 0 92 92 0 357 3 vmsppl 480 601 0 571 5 0 5 5 0 8 1 rwobjpl 72 16690 0 13644 56 0 56 56 0 8 0 pdppl 4096 1211 0 1142 105 34 71 85 0 8 2 pvpl 32 13228 0 0 108 1 107 108 0 265 0 pmappl 256 601 0 571 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 387 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(ffffffff83844ff0) 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_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:654 comcnputc(800,20) at comcnputc+0xd0 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,20) at comcnputc+0xd0 sys/dev/ic/com.c:1259 cnputc(20) at cnputc+0x61 sys/dev/cons.c:218 kputchar(20,5,0) at kputchar+0x2cc sys/kern/subr_prf.c:367 kprintf() at kprintf+0x843 sys/kern/subr_prf.c:-1 printf(ffffffff834447cd) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff80003c427d20,6) at trap_print+0x70 sys/arch/amd64/amd64/trap.c:457 kerntrap(ffff80003c427d20) at kerntrap+0x276 sys/arch/amd64/amd64/trap.c:328 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001484000) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:579 dtclose(11e5f,81,2000,ffff8000ffff0020) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff8000ffff0020) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 end trace frame: 0xffff80003c427ec0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83844ff0) 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_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:654 comcnputc(800,20) at comcnputc+0xd0 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,20) at comcnputc+0xd0 sys/dev/ic/com.c:1259 cnputc(20) at cnputc+0x61 sys/dev/cons.c:218 kputchar(20,5,0) at kputchar+0x2cc sys/kern/subr_prf.c:367 kprintf() at kprintf+0x843 sys/kern/subr_prf.c:-1 printf(ffffffff834447cd) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff80003c427d20,6) at trap_print+0x70 sys/arch/amd64/amd64/trap.c:457 kerntrap(ffff80003c427d20) at kerntrap+0x276 sys/arch/amd64/amd64/trap.c:328 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001484000) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:579 dtclose(11e5f,81,2000,ffff8000ffff0020) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff8000ffff0020) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c427ed0) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806af77210,81,fffffd807f7d3208,ffff8000ffff0020) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8060b2fa70,ffff8000ffff0020) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8060b2fa70,ffff8000ffff0020) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8060b2fa70,ffff8000ffff0020) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd8060b2fa70,ffff8000ffff0020) at closef+0x192 sys/kern/kern_descrip.c:1251 syscall(ffff80003c428130) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c428130) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xce088dd06b0, count: -21 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x680 savectx() at savectx+0xae end of kernel end trace frame: 0x7cbab7f85660, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7cbab7f85660, count: -1