*cpu0: uvm_fault(0xfffffd80681b7d80, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x8334fba3890, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800031801db0 rbx 0 rdx 0xffff80000144e740 rcx 0xffff80003640a028 rax 0x33 r8 0xffff800031801ce0 r9 0x1 r10 0x8371b0bebbf34f5d r11 0x34518981fefc8f6d r12 0 r13 0 r14 0xffff80003640a028 r15 0 rip 0xffffffff820703ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff800031801d30 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=108469 pid=24781 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003640bcb0,0xffff80003640a2d0 process=0xffff800038826240 user=0xffff8000317fc000, vmspace=0xfffffd800b027d58 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 88082 151272 69319 0 2 0 syz-executor 88082 85201 69319 0 2 0x4000000 syz-executor 88082 520025 69319 0 3 0x4000080 fsleep syz-executor 24781 133325 21503 0 2 0 syz-executor *24781 108469 21503 0 7 0x4000000 syz-executor 27717 460571 6978 0 2 0 syz-executor 27717 161057 6978 0 3 0x4000080 kqsel syz-executor 27717 344175 6978 0 3 0x4000080 fsleep syz-executor 17799 286136 48100 0 3 0x80 nanoslp syz-executor 17799 344950 48100 0 3 0x4000080 kqread syz-executor 17799 288085 48100 0 3 0x4000080 fsleep syz-executor 92917 48671 6897 0 3 0x80 nanoslp syz-executor 92917 373642 6897 0 3 0x4000080 fsleep syz-executor 92917 88813 6897 0 3 0x4000080 ttyout syz-executor 92917 343635 6897 0 3 0x4000080 fsleep syz-executor 92917 78544 6897 0 3 0x4000080 fsleep syz-executor 12500 4266 49464 0 4 0x82000 syz-executor 12500 112941 49464 0 2 0x4082000 syz-executor 12500 522857 49464 0 3 0x4082000 inode syz-executor 12500 310203 49464 0 3 0x4082000 inode syz-executor 12500 296469 49464 0 3 0x4002000 suspend syz-executor 6978 160095 70150 0 2 0x2 syz-executor 21503 507402 70150 0 2 0x3 syz-executor 42926 171512 1 0 3 0x100083 ttyopn getty 69319 166995 70150 0 2 0x3 syz-executor 49464 185682 70150 0 3 0x82 wait syz-executor 71597 245103 0 0 3 0x14280 nfsidl nfsio 12637 332863 0 0 3 0x14280 nfsidl nfsio 85048 204000 0 0 3 0x14280 nfsidl nfsio 31394 191530 0 0 3 0x14280 nfsidl nfsio 16366 302554 0 0 3 0x14280 nfsidl nfsio 76332 352222 0 0 3 0x14280 nfsidl nfsio 73244 200468 0 0 3 0x14280 nfsidl nfsio 13108 507976 0 0 3 0x14280 nfsidl nfsio 1167 438251 0 0 3 0x14280 nfsidl nfsio 95445 131363 0 0 3 0x14280 nfsidl nfsio 41036 220194 0 0 3 0x14280 nfsidl nfsio 80337 50471 0 0 3 0x14280 nfsidl nfsio 32587 22000 0 0 3 0x14280 nfsidl nfsio 27776 470982 0 0 3 0x14280 nfsidl nfsio 83215 448425 0 0 3 0x14280 nfsidl nfsio 23484 178649 0 0 3 0x14280 nfsidl nfsio 45360 147971 0 0 3 0x14280 nfsidl nfsio 41671 477855 0 0 3 0x14280 nfsidl nfsio 12238 175412 0 0 3 0x14280 nfsidl nfsio 87206 455131 0 0 3 0x14280 nfsidl nfsio 94816 257142 0 0 3 0x14200 bored sosplice 48100 194537 70150 0 2 0x2 syz-executor 6897 14404 70150 0 2 0x3 syz-executor 16430 250085 70150 0 2 0x3 syz-executor 46589 425323 70150 0 3 0x82 wait syz-executor 70150 187353 84932 0 3 0x82 kqread syz-executor 84932 124281 58692 0 3 0x10008a sigsusp ksh 58692 29810 17131 0 3 0x98 kqread sshd-session 17131 85121 23581 0 3 0x92 kqread sshd-session 23581 239697 1 0 3 0x88 kqread sshd 71043 403023 19994 74 3 0x1100092 bpf pflogd 19994 152015 1 0 3 0x80 sbwait pflogd 47894 433597 36932 73 3 0x1100090 kqread syslogd 36932 420901 1 0 3 0x100082 sbwait syslogd 54659 257407 1 0 3 0x100080 kqread resolvd 11182 190668 60944 77 3 0x100092 kqread dhcpleased 25269 451712 60944 77 3 0x100092 kqread dhcpleased 60944 292961 1 0 3 0x80 kqread dhcpleased 59562 159048 0 0 3 0x14200 bored smr 45435 470288 0 0 3 0x14200 pgzero zerothread 54746 474506 0 0 3 0x14200 aiodoned aiodoned 93926 420705 0 0 3 0x14200 syncer update 79002 7140 0 0 3 0x14200 cleaner cleaner 8504 434024 0 0 2 0x14200 reaper 28510 220588 0 0 3 0x14200 pgdaemon pagedaemon 65352 351671 0 0 3 0x14200 bored viomb 39850 512793 0 0 3 0x40014200 acpi0 acpi0 52608 173238 0 0 3 0x40014200 idle1 14932 84339 0 0 3 0x14200 bored softnet7 51498 127224 0 0 3 0x14200 bored softnet6 53763 129527 0 0 3 0x14200 bored softnet5 51917 112784 0 0 3 0x14200 bored softnet4 6532 361094 0 0 3 0x14200 bored softnet3 69291 30014 0 0 3 0x14200 bored softnet2 53258 276568 0 0 3 0x14200 bored softnet1 73653 473327 0 0 3 0x14200 bored softnet0 43515 236394 0 0 3 0x14200 bored systqmp 11601 484186 0 0 3 0x14200 bored systq 16235 183771 0 0 3 0x14200 netlock softclockmp 50016 289403 0 0 3 0x40014200 netlock softclock 49706 356554 0 0 3 0x40014200 idle0 1 227584 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex /syzkaller/managers/multicore/kernel/sys/kern/kern_descrip.c:69 r = 0 (0xffffffff83778b90) #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 fdinsert+0x5e sys/kern/kern_descrip.c:709 #4 sys_socket+0x2cd sys/kern/uipc_syscalls.c:117 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #6 Xsyscall+0x128 Process 24781 (syz-executor) thread 0xffff80003640a028 (108469) exclusive rwlock fdlock r = 0 (0xffff800038823720) #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 sys_socket+0x203 sys/kern/uipc_syscalls.c:106 #3 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #4 Xsyscall+0x128 exclusive mutex /syzkaller/managers/multicore/kernel/sys/kern/kern_descrip.c:69 r = 0 (0xffffffff83778b90) #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 fdinsert+0x5e sys/kern/kern_descrip.c:709 #4 sys_socket+0x2cd sys/kern/uipc_syscalls.c:117 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #6 Xsyscall+0x128 Process 12500 (syz-executor) thread 0xffff800033c082b8 (112941) exclusive rrwlock inode r = 0 (0xfffffd806e2796b8) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 Process 12500 (syz-executor) thread 0xffff80003640ad20 (310203) exclusive rrwlock inode r = 0 (0xfffffd806e279468) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 Process 8504 (reaper) thread 0xffff8000ffffc538 (434024) exclusive rwlock kmmaplk r = 0 (0xffffffff8392cfa8) #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:5168 #3 uvm_unmap+0x7d sys/uvm/uvm_map.c:1792 #4 km_free+0x87 sys/uvm/uvm_km.c:831 #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 16235 (softclockmp) thread 0xffff8000fffff228 (183771) shared rwlock timeout r = 0 (0xffffffff837e5ff8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 timeout_run+0x115 sys/kern/kern_timeout.c:694 #2 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 #3 softclock_thread_mp+0x86 #4 proc_trampoline+0x10 Process 50016 (softclock) thread 0xffff8000fffff4c0 (289403) shared rwlock timeout r = 0 (0xffffffff837e5ff8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 timeout_run+0x115 sys/kern/kern_timeout.c:694 #2 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 #3 softclock_thread+0x10a sys/kern/kern_timeout.c:858 #4 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10261 11160K 11325K 166960K 13818 0 pcb 17 17K 19K 166960K 681 0 rtable 188 12K 13K 166960K 785 0 pf 40 18K 67486K 166960K 289 0 ifaddr 37 6K 8K 166960K 163 0 ifgroup 59 2K 3K 166960K 293 0 sysctl 4 1K 9K 166960K 21 0 counters 70 37K 38K 166960K 464 0 ioctlops 0 0K 4K 166960K 1903 0 iov 0 0K 24K 166960K 119 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1460 92K 92K 166960K 3521 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 20 0 VM map 2 1K 1K 166960K 2 0 sem 25 5K 5K 166960K 150 0 dirhash 12 2K 2K 166960K 54 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 2202 0 sigio 0 0K 0K 166960K 62 0 proc 75 131K 180K 166960K 931 0 subproc 72 4K 4K 166960K 117 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 293 0 in_multi 73 5K 7K 166960K 221 0 ether_multi 1 0K 0K 166960K 22 0 mrt 1 0K 0K 166960K 15 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 745 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 68 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 271 160K 176K 166960K 22108 0 UVM aobj 39 2K 2K 166960K 42 0 pinsyscall 43 86K 101K 166960K 3458 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 1K 166960K 162 0 NDP 13 0K 2K 166960K 120 0 temp 89 8652K 8766K 166960K 122227 0 kqueue 16 26K 30K 166960K 433 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 120 311 0 308 4 3 1 3 0 8 0 rtentry 176 191 0 127 5 1 4 5 0 8 0 unpcb 144 1909 0 1890 13 12 1 6 0 8 0 syncache 336 16 0 16 5 4 1 1 0 8 1 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 819 0 811 15 13 2 7 0 8 1 arp 128 21 0 13 1 0 1 1 0 8 0 inpcb 328 2930 0 2913 25 18 7 12 0 8 5 nd6 144 35 0 21 1 0 1 1 0 8 0 pkpcb 40 23 0 23 3 3 0 1 0 8 0 kcovpl 48 13 0 5 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 170 0 170 3 2 1 1 0 8 1 pppxif 1504 12 0 12 3 2 1 1 0 8 1 pffrag 232 20 0 8 1 0 1 1 0 482 0 pffrnode 88 19 0 7 1 0 1 1 0 8 0 pffrent 40 30 0 18 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 34 0 34 2 2 0 1 0 8 0 pftag 88 3 0 0 1 0 1 1 0 8 0 pfstitem 24 147 0 55 1 0 1 1 0 8 0 pfstkey 128 147 0 55 4 0 4 4 0 8 0 pfstate 384 146 0 55 10 0 10 10 0 8 0 pfrule 1344 29 0 22 2 0 2 2 0 8 0 rttmr 136 4 0 4 2 2 0 1 0 8 0 art_heap8 4096 3 0 1 3 1 2 3 0 8 0 art_heap4 256 869 0 533 31 7 24 29 0 8 0 art_table 40 872 0 534 5 0 5 5 0 8 0 art_node 32 191 0 134 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 10 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 145 0 122 1 0 1 1 0 8 0 shmpl 112 39 0 3 2 0 2 2 0 8 0 dirhash 1024 45 0 28 3 0 3 3 0 8 0 dino2pl 256 5870 0 4351 97 1 96 96 0 8 0 ffsino 296 5870 0 4351 118 0 118 118 0 8 0 nchpl 144 8841 0 7131 64 0 64 64 0 8 0 rtmask 32 27 0 27 4 4 0 1 0 8 0 uvmvnodes 80 6954 0 0 142 0 142 142 0 8 0 vnodes 216 6954 0 0 387 0 387 387 0 8 0 namei 1024 31469 0 31468 2 1 1 1 0 8 0 percpumem 16 247 0 197 1 0 1 1 0 8 0 kstatmem 264 194 0 162 4 1 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 8 0 8 3 3 0 1 0 8 0 scxspl 216 49036 0 49036 11 10 1 8 1 8 1 plimitpl 152 588 0 570 1 0 1 1 0 8 0 sigapl 424 2523 0 2448 9 0 9 9 0 8 0 knotepl 120 543 0 0 17 0 17 17 0 8 0 kqueuepl 224 1012 0 999 13 12 1 5 0 8 0 pipepl 344 483 0 456 11 4 7 9 0 8 4 fdescpl 528 2475 0 2443 3 0 3 3 0 8 0 filepl 160 18080 0 17850 32 15 17 19 0 8 3 lockfpl 104 1114 0 1111 3 2 1 2 0 8 0 lockfspl 48 425 0 422 1 0 1 1 0 8 0 sessionpl 144 33 0 24 1 0 1 1 0 8 0 pgrppl 48 68 0 51 1 0 1 1 0 8 0 ucredpl 104 3266 0 3252 1 0 1 1 0 8 0 zombiepl 144 2715 0 2713 1 0 1 1 0 8 0 processpl 1248 2523 0 2448 6 0 6 6 0 8 0 procpl 664 5934 0 5841 9 1 8 9 0 8 0 srpgc 96 1 0 1 1 1 0 1 0 8 0 sosppl 168 12 0 12 4 3 1 1 0 8 1 sockpl 752 5223 0 5184 43 33 10 19 0 8 5 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 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 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 132 0 0 17 0 17 17 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 52 0 0 7 0 7 7 0 8 0 mtagpl 96 9 0 0 1 0 1 1 0 8 0 mbufpl 256 282 0 0 15 0 15 15 0 8 0 bufpl 280 20017 0 13874 441 1 440 440 0 8 0 anonpl 32 11816 0 0 96 0 96 96 0 246 0 amapchunkpl 152 73721 0 73134 48 18 30 33 0 158 4 amappl16 200 8093 0 7882 61 49 12 28 0 8 0 amappl15 192 1 0 1 1 1 0 1 0 8 0 amappl14 184 134 0 122 1 0 1 1 0 8 0 amappl13 176 6 0 5 1 0 1 1 0 8 0 amappl12 168 3223 0 3191 3 1 2 2 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 255 0 255 1 1 0 1 0 8 0 amappl8 136 24 0 21 1 0 1 1 0 8 0 amappl7 128 131 0 118 1 0 1 1 0 8 0 amappl6 120 229 0 226 1 0 1 1 0 8 0 amappl5 112 145 0 135 1 0 1 1 0 8 0 amappl4 104 336 0 317 1 0 1 1 0 8 0 amappl3 96 15028 0 14896 4 0 4 4 0 8 0 amappl2 88 758 0 692 2 0 2 2 0 8 0 amappl1 80 18075 0 17471 16 2 14 15 0 8 0 amappl 88 20938 0 20739 5 0 5 5 0 92 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 8 0 8 3 3 0 1 0 8 0 dma128 128 257 0 257 3 3 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 41 0 3 1 0 1 1 0 8 0 uaddrrnd 24 2475 0 2443 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2475 0 2443 1 0 1 1 0 8 0 vmmpekpl 168 20615 0 20556 3 0 3 3 0 8 0 vmmpepl 168 159059 0 156776 125 24 101 111 0 357 1 vmsppl 488 2474 0 2443 6 1 5 5 0 8 0 rwobjpl 80 48460 0 40306 168 1 167 167 0 8 0 pdppl 4096 4958 0 4886 120 48 72 84 0 8 0 pvpl 32 21680 0 0 175 1 174 175 0 265 0 pmappl 256 2474 0 2443 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 329 0 82 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8386bff0) 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(800,6c) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,6c) at comcnputc+0x250 sys/dev/ic/com.c:1269 cnputc(6c) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(6c) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x203 sys/kern/subr_prf.c:723 db_printf(ffffffff833fade6) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c53f680) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80003c53f680) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c53f680) at kerntrap+0x23e sys/arch/amd64/amd64/trap.c:482 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001479000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,1,2000,ffff8000ffff3238) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,1,2000,ffff8000ffff3238) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 end trace frame: 0xffff80003c53f820, count: 0 ddb{0}> trace x86_ipi_db(ffffffff8386bff0) 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(800,6c) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,6c) at comcnputc+0x250 sys/dev/ic/com.c:1269 cnputc(6c) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(6c) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x203 sys/kern/subr_prf.c:723 db_printf(ffffffff833fade6) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c53f680) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80003c53f680) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c53f680) at kerntrap+0x23e sys/arch/amd64/amd64/trap.c:482 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001479000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,1,2000,ffff8000ffff3238) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,1,2000,ffff8000ffff3238) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c53f830) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd800e26d2c8,1,fffffd80097fb478,ffff8000ffff3238) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c816158,ffff8000ffff3238) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c816158,ffff8000ffff3238) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c816158,ffff8000ffff3238) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c816158,ffff8000ffff3238) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000ffff3238) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000ffff3238,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000ffff3238,ffff80003c53fba0,ffff80003c53faf0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c53fba0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c53fba0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x739fe724b570, count: -24 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x8334fba3890, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x8334fba3890, count: -1