*cpu0: uvm_fault(0xfffffd806cb10018, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x767c22b8e8a0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c4514e0 rbx 0 rdx 0 rcx 0xffff80003c436560 rax 0x3a r8 0xffff80003c451410 r9 0 r10 0x37253e07330b29cd r11 0x1a0e086ec596b846 r12 0 r13 0 r14 0xffff80003c436560 r15 0 rip 0xffffffff810de3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c451460 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=208468 pid=89072 tcnt=2 stat=onproc flags process=0 proc=0 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c4374f0,0xffff80003c437268 process=0xffff8000fffec018 user=0xffff80003c44c000, vmspace=0xfffffd8068447020 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *89072 208468 45362 0 7 0 syz-executor 89072 234183 45362 0 3 0x4000080 fsleep syz-executor 78419 441379 28356 0 2 0 syz-executor 78419 114227 28356 0 2 0x4000000 syz-executor 31663 15875 0 0 3 0x14200 acct acct 41877 507225 43821 0 2 0 syz-executor 41877 166893 43821 0 3 0x4000080 fsleep syz-executor 59742 231220 85329 0 3 0x80 nanoslp syz-executor 59742 470257 85329 0 3 0x4000080 kqsel syz-executor 59742 143839 85329 0 3 0x4000080 fsleep syz-executor 42852 160981 25143 0 2 0x1000000 syz-executor 42852 231054 25143 0 3 0x5000080 fsleep syz-executor 42852 302444 25143 0 3 0x5000080 fsleep syz-executor 42852 323177 25143 0 3 0x5000080 fsleep syz-executor 42852 126507 25143 0 3 0x5000080 fsleep syz-executor 42852 477557 25143 0 3 0x5000080 sbwait syz-executor 42852 195021 25143 0 3 0x5000080 fsleep syz-executor 42852 361685 25143 0 3 0x5000080 fsleep syz-executor 45362 271128 444 0 2 0xc82 syz-executor 43821 270117 444 0 2 0xc82 syz-executor 22298 503995 30000 0 3 0x100082 sbwait arp 30000 497617 1 0 3 0x10008a sigsusp sh 15391 210049 444 0 3 0x82 nanoslp syz-executor 84225 393151 444 0 2 0xc82 syz-executor 25143 349879 444 0 3 0x82 nanoslp syz-executor 85329 414988 444 0 3 0x82 nanoslp syz-executor 28356 347700 444 0 3 0x82 nanoslp syz-executor 6741 84183 444 0 2 0xc82 syz-executor 444 465999 63042 0 3 0x82 kqread syz-executor 63042 386916 88632 0 3 0x10008a sigsusp ksh 88632 370777 44301 0 3 0x98 kqread sshd-session 44301 303967 84002 0 3 0x92 kqread sshd-session 11778 443843 1 0 3 0x100083 ttyopn getty 84002 195509 1 0 3 0x88 kqread sshd 98293 145372 20761 74 3 0x1100092 bpf pflogd 20761 360610 1 0 3 0x80 sbwait pflogd 98115 245810 15874 73 3 0x1100090 kqread syslogd 15874 131776 1 0 3 0x100082 sbwait syslogd 93110 144535 1 0 3 0x100080 kqread resolvd 15403 443831 67060 77 3 0x100092 kqread dhcpleased 5130 483151 67060 77 3 0x100092 kqread dhcpleased 67060 431520 1 0 3 0x80 kqread dhcpleased 71258 447338 0 0 3 0x14200 bored smr 56986 16546 0 0 2 0x14200 zerothread 67149 364628 0 0 3 0x14200 aiodoned aiodoned 88709 238347 0 0 3 0x14200 syncer update 51102 92966 0 0 3 0x14200 cleaner cleaner 53345 262745 0 0 2 0x14200 reaper 93273 108649 0 0 3 0x14200 pgdaemon pagedaemon 79276 82644 0 0 3 0x14200 bored viomb 10703 87591 0 0 3 0x40014200 acpi0 acpi0 74568 424485 0 0 3 0x40014200 idle1 1639 391722 0 0 3 0x14200 bored softnet1 67104 504769 0 0 3 0x14200 bored softnet0 17107 416634 0 0 3 0x14200 smrbar systqmp 5408 266894 0 0 3 0x14200 bored systq 35617 222905 0 0 3 0x14200 tmoslp softclockmp 46215 171606 0 0 3 0x40014200 tmoslp softclock 49947 465949 0 0 3 0x40014200 idle0 1 301265 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd8068435b10) #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 pmap_write_protect+0x80 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #3 pmap_write_protect+0x80 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] #3 pmap_write_protect+0x80 sys/arch/amd64/amd64/pmap.c:2163 #4 uvm_map_protect+0xb95 pmap_protect sys/arch/amd64/compile/SYZKALLER/obj/machine/pmap.h:476 [inline] #4 uvm_map_protect+0xb95 sys/uvm/uvm_map.c:3191 #5 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #7 Xsyscall+0x128 Process 89072 (syz-executor) thread 0xffff80003c436560 (208468) exclusive rwlock uobjlk r = 0 (0xfffffd805cfb3038) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 uvm_map_protect+0xb36 sys/uvm/uvm_map.c:3191 #3 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #5 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffffd8068447120) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5171 #3 uvm_map_protect+0xe0 sys/uvm/uvm_map.c:3064 #4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #6 Xsyscall+0x128 exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd8068435b10) #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 pmap_write_protect+0x80 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #3 pmap_write_protect+0x80 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] #3 pmap_write_protect+0x80 sys/arch/amd64/amd64/pmap.c:2163 #4 uvm_map_protect+0xb95 pmap_protect sys/arch/amd64/compile/SYZKALLER/obj/machine/pmap.h:476 [inline] #4 uvm_map_protect+0xb95 sys/uvm/uvm_map.c:3191 #5 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #7 Xsyscall+0x128 Process 53345 (reaper) thread 0xffff8000ffffdc90 (262745) exclusive rwlock kmmaplk r = 0 (0xffffffff83a0e6a0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5171 #3 uvm_unmap+0x7d sys/uvm/uvm_map.c:1792 #4 km_free+0x87 sys/uvm/uvm_km.c:714 #5 uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304 #6 reaper+0x1aa sys/kern/kern_exit.c:493 #7 proc_trampoline+0x10 Process 17107 (systqmp) thread 0xffff8000ffffe000 (416634) shared rwlock systqmp r = 0 (0xffffffff83812d08) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10253 11188K 14468K 166960K 14798 0 pcb 18 16K 17K 166960K 564 0 rtable 224 12K 12K 166960K 610 0 pf 38 18K 22K 166960K 272 0 ifaddr 36 6K 8K 166960K 144 0 ifgroup 49 2K 2K 166960K 275 0 sysctl 4 1K 9K 166960K 25 0 counters 68 36K 38K 166960K 298 0 ioctlops 0 0K 8K 166960K 1957 0 iov 0 0K 16K 166960K 97 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1626 102K 102K 166960K 3191 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 13K 166960K 22 0 VM map 2 1K 1K 166960K 2 0 sem 25 137K 137K 166960K 160 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 20 73K 114K 166960K 1758 0 sigio 0 0K 0K 166960K 31 0 proc 72 115K 179K 166960K 763 0 subproc 81 5K 5K 166960K 102 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 407 0 in_multi 77 5K 7K 166960K 178 0 ether_multi 1 0K 0K 166960K 18 0 mrt 1 0K 0K 166960K 14 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 724 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 275 170K 187K 166960K 18569 0 UVM aobj 135 18K 20K 166960K 141 0 pinsyscall 46 92K 103K 166960K 3004 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 150 0 NDP 11 0K 1K 166960K 106 0 temp 83 8680K 8936K 166960K 78978 0 kqueue 14 22K 28K 166960K 328 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 120 271 0 266 4 3 1 3 0 8 0 rtentry 176 169 0 81 5 0 5 5 0 8 0 unpcb 144 1161 0 1142 9 6 3 6 0 8 2 syncache 336 9 0 9 4 4 0 1 0 8 0 tcpqe 32 2 0 2 2 2 0 1 0 8 0 tcpcb 736 572 0 565 13 9 4 7 0 8 3 arp 136 26 0 11 1 0 1 1 0 8 0 inpcb 328 2027 0 2015 22 15 7 10 0 8 5 nd6 152 38 0 14 2 0 2 2 0 8 0 pkpcb 40 37 0 37 4 3 1 1 0 8 1 kcovpl 48 11 0 2 1 0 1 1 0 8 0 mppekey 1024 3 0 3 2 2 0 1 0 8 0 ppxss 1192 88 0 86 3 2 1 1 0 8 0 pppxif 1504 12 0 12 3 3 0 1 0 8 0 pfstscr 40 2 0 1 2 1 1 1 0 8 0 pffrag 232 33 0 22 1 0 1 1 0 482 0 pffrnode 88 13 0 4 1 0 1 1 0 8 0 pffrent 40 70 0 58 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 4 0 4 3 2 1 1 0 8 1 pfanchor 1288 1 0 1 1 1 0 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 105 0 46 1 0 1 1 0 8 0 pfstkey 128 112 0 54 3 0 3 3 0 8 0 pfstate 448 107 0 50 8 0 8 8 0 8 0 pfrule 1344 28 0 23 2 1 1 2 0 8 0 rttmr 136 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 748 0 369 29 2 27 28 0 8 1 art_table 40 751 0 369 5 0 5 5 0 8 0 art_node 32 168 0 88 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 12 2 1 1 1 0 8 0 semupl 112 3 0 3 3 2 1 1 0 8 1 semapl 112 154 0 131 1 0 1 1 0 8 0 shmpl 112 128 0 3 4 0 4 4 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 4690 0 3189 95 0 95 95 0 8 0 ffsino 296 4690 0 3189 117 0 117 117 0 8 0 nchpl 144 7146 0 5432 64 0 64 64 0 8 0 rtmask 32 21 0 21 5 4 1 1 0 8 1 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 25879 0 25879 4 2 2 2 0 8 2 percpumem 16 164 0 115 1 0 1 1 0 8 0 vcpupl 3968 8 0 1 1 0 1 1 0 8 0 vmpool 840 10 0 3 1 0 1 1 0 8 0 kstatmem 264 174 0 150 5 2 3 3 0 8 0 scsiplug 72 4 0 4 3 2 1 1 0 8 1 scxspl 216 36233 0 36233 13 12 1 8 1 8 1 plimitpl 152 452 0 433 1 0 1 1 0 8 0 sigapl 424 2113 0 2062 9 2 7 8 0 8 0 knotepl 120 726 0 0 22 0 22 22 0 8 0 kqueuepl 224 718 0 704 7 5 2 5 0 8 0 pipepl 344 375 0 345 13 10 3 9 0 8 0 fdescpl 528 2053 0 2019 3 0 3 3 0 8 0 filepl 160 14312 0 14068 26 12 14 20 0 8 2 lockfpl 104 838 0 836 2 1 1 2 0 8 0 lockfspl 48 304 0 302 1 0 1 1 0 8 0 sessionpl 144 29 0 20 1 0 1 1 0 8 0 pgrppl 48 90 0 72 1 0 1 1 0 8 0 ucredpl 104 2049 0 2036 1 0 1 1 0 8 0 zombiepl 144 2992 0 2989 1 0 1 1 0 8 0 processpl 1232 2113 0 2062 6 1 5 6 0 8 0 procpl 664 4957 0 4893 8 1 7 8 0 8 1 sosppl 176 6 0 6 3 3 0 1 0 8 0 sockpl 752 3567 0 3531 31 20 11 17 0 8 7 mcl64k 65536 12 0 0 2 0 2 2 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 48 0 0 6 0 6 6 0 8 0 mtagpl 96 96 0 0 3 0 3 3 0 8 0 mbufpl 256 506 0 0 32 0 32 32 0 8 0 bufpl 280 13263 0 7126 439 0 439 439 0 8 0 anonpl 32 10147 0 0 82 0 82 82 0 246 0 amapchunkpl 152 63744 0 63183 47 19 28 34 0 158 3 amappl16 200 7286 0 7200 55 38 17 22 0 8 8 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 10 0 10 1 1 0 1 0 8 0 amappl13 176 469 0 467 1 0 1 1 0 8 0 amappl12 168 2451 0 2404 3 0 3 3 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 51 0 37 1 0 1 1 0 8 0 amappl9 144 254 0 253 1 0 1 1 0 8 0 amappl8 136 44 0 41 1 0 1 1 0 8 0 amappl7 128 105 0 103 1 0 1 1 0 8 0 amappl6 120 342 0 326 1 0 1 1 0 8 0 amappl5 112 102 0 91 1 0 1 1 0 8 0 amappl4 104 465 0 432 1 0 1 1 0 8 0 amappl3 96 11001 0 10894 4 1 3 3 0 8 0 amappl2 88 2207 0 2126 2 0 2 2 0 8 0 amappl1 80 17265 0 16633 17 2 15 15 0 8 0 amappl 88 17463 0 17271 6 1 5 5 0 92 0 uvmvnodes 80 170 0 0 4 0 4 4 0 8 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 7 0 7 2 2 0 1 0 8 0 dma128 128 254 0 254 2 2 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 140 0 6 3 0 3 3 0 8 0 uaddrrnd 24 2053 0 2019 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2053 0 2019 1 0 1 1 0 8 0 vmmpekpl 168 18487 0 18440 3 0 3 3 0 8 0 vmmpepl 168 136559 0 134411 126 18 108 108 0 357 11 vmsppl 488 2052 0 2019 5 0 5 5 0 8 0 rwobjpl 80 38128 0 36758 39 4 35 35 0 8 2 pdppl 4096 4134 0 4051 129 45 84 84 0 8 1 pvpl 32 17194 0 0 138 0 138 138 0 265 0 pmappl 256 2062 0 2022 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 354 0 67 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83867ff0) 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:682 acpitimer_delay(1) at acpitimer_delay+0x57 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x57 sys/dev/acpi/acpitimer.c:120 comcnputc(800,61) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(61) at cnputc+0x67 sys/dev/cons.c:218 kputchar(61,5,0) at kputchar+0x2ed sys/kern/subr_prf.c:367 kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1 printf(ffffffff834587c4) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff8000333e40b0,6) at trap_print+0x70 sys/arch/amd64/amd64/trap.c:653 kerntrap(ffff8000333e40b0) at kerntrap+0x2e6 sys/arch/amd64/amd64/trap.c:516 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff8000018ca000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 end trace frame: 0xffff8000333e41e0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83867ff0) 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:682 acpitimer_delay(1) at acpitimer_delay+0x57 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x57 sys/dev/acpi/acpitimer.c:120 comcnputc(800,61) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(61) at cnputc+0x67 sys/dev/cons.c:218 kputchar(61,5,0) at kputchar+0x2ed sys/kern/subr_prf.c:367 kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1 printf(ffffffff834587c4) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff8000333e40b0,6) at trap_print+0x70 sys/arch/amd64/amd64/trap.c:653 kerntrap(ffff8000333e40b0) at kerntrap+0x2e6 sys/arch/amd64/amd64/trap.c:516 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff8000018ca000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(21e5f,81,2000,ffff8000fffe82b8) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff8000fffe82b8) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff8000333e4260) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80583cfcc8,81,fffffd80097fd3a8,ffff8000fffe82b8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806cf41b08,ffff8000fffe82b8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806cf41b08,ffff8000fffe82b8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806cf41b08,ffff8000fffe82b8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806cf41b08,ffff8000fffe82b8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000fffe82b8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000fffe82b8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffe82b8,ffff8000333e45d0,ffff8000333e4520) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000333e45d0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000333e45d0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79a98eacd4a0, 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: 0x767c22b8e8a0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x767c22b8e8a0, count: -1