*cpu0: uvm_fault(0xfffffd806bccd020, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x75fd9ab5e5e0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002abdcea0 rbx 0 rdx 0 rcx 0xffff8000ffff0a60 rax 0x3b r8 0xffff80002abdcdd0 r9 0 r10 0xa185673719bba213 r11 0xf293f36b4a546039 r12 0 r13 0 r14 0xffff8000ffff0a60 r15 0 rip 0xffffffff81b3f3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002abdce20 ss 0x10 savectx+0xae: movl $0,%gs:0x680 ddb{1}> show proc PROC (syz-executor) tid=27615 pid=34703 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=0xffff80002a2fd9d8,0xffff8000ffff0f90 process=0xffff8000fffeaeb0 user=0xffff80002abd7000, vmspace=0xfffffd806bec01f8 estcpu=36, cpticks=1, pctcpu=0.0, user=1, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 57784 384464 27580 0 2 0 syz-executor *34703 27615 20028 0 7 0 syz-executor 34703 383787 20028 0 2 0x4000080 syz-executor 56808 480973 0 0 3 0x14200 acct acct 65539 268085 31846 0 3 0x80 nanoslp syz-executor 65539 317984 31846 0 3 0x4000080 sbwait syz-executor 65539 520554 31846 0 3 0x4000080 fsleep syz-executor 52636 435906 58438 0 3 0x80 nanoslp syz-executor 52636 369098 58438 0 3 0x4000080 ttyin syz-executor 95116 35697 35412 0 3 0x80 nanoslp syz-executor 95116 149778 35412 0 3 0x4000080 nanoslp syz-executor 95116 350785 35412 0 3 0x4000080 fsleep syz-executor 95116 146021 35412 0 3 0x4000080 fsleep syz-executor 46952 207257 1 0 3 0x82 nanoslp getty 35412 471868 20967 0 2 0x2 syz-executor 9381 10178 0 0 3 0x14280 nfsidl nfsio 72335 193247 0 0 3 0x14280 nfsidl nfsio 6166 372714 0 0 3 0x14280 nfsidl nfsio 65009 334297 0 0 3 0x14280 nfsidl nfsio 34076 413267 0 0 3 0x14280 nfsidl nfsio 56977 208643 0 0 3 0x14280 nfsidl nfsio 59818 433992 0 0 3 0x14280 nfsidl nfsio 97322 358261 0 0 3 0x14280 nfsidl nfsio 44775 309833 0 0 3 0x14280 nfsidl nfsio 45474 28706 0 0 3 0x14280 nfsidl nfsio 10921 29838 0 0 3 0x14280 nfsidl nfsio 36965 29828 0 0 3 0x14280 nfsidl nfsio 72209 34092 0 0 3 0x14280 nfsidl nfsio 59863 27119 0 0 3 0x14280 nfsidl nfsio 28107 295996 0 0 3 0x14280 nfsidl nfsio 43951 104362 0 0 3 0x14280 nfsidl nfsio 97418 77282 0 0 3 0x14280 nfsidl nfsio 70916 116818 0 0 3 0x14280 nfsidl nfsio 57462 271237 0 0 3 0x14280 nfsidl nfsio 18299 277039 0 0 3 0x14280 nfsidl nfsio 20028 434986 20967 0 3 0x82 nanoslp syz-executor 72050 103194 0 0 3 0x14200 bored sosplice 58438 282360 20967 0 3 0x82 nanoslp syz-executor 8388 464654 20967 0 3 0x82 nanoslp syz-executor 31846 347640 20967 0 3 0x82 nanoslp syz-executor 5998 192654 20967 0 3 0x82 nanoslp syz-executor 33420 311688 20967 0 2 0x2 syz-executor 27580 422681 20967 0 3 0x82 nanoslp syz-executor 20967 452589 75450 0 3 0x82 kqread syz-executor 75450 104795 21130 0 3 0x10008a sigsusp ksh 21130 156326 55463 0 3 0x98 kqread sshd-session 55463 391541 6447 0 3 0x92 kqread sshd-session 6447 149686 1 0 3 0x88 kqread sshd 85851 234084 85025 74 3 0x1100092 bpf pflogd 85025 496507 1 0 3 0x80 sbwait pflogd 99397 81283 44419 73 3 0x1100090 kqread syslogd 44419 321672 1 0 3 0x100082 sbwait syslogd 2251 468062 1 0 3 0x100080 kqread resolvd 47266 45571 74519 77 3 0x100092 kqread dhcpleased 46594 206560 74519 77 3 0x100092 kqread dhcpleased 74519 33135 1 0 3 0x80 kqread dhcpleased 18330 491542 0 0 2 0x14200 smr 82453 303916 0 0 3 0x14200 pgzero zerothread 61340 131185 0 0 3 0x14200 aiodoned aiodoned 71899 240520 0 0 3 0x14200 syncer update 41156 236033 0 0 3 0x14200 cleaner cleaner 30072 503480 0 0 2 0x14200 reaper 73318 187272 0 0 3 0x14200 pgdaemon pagedaemon 28852 156811 0 0 3 0x14200 bored viomb 15252 357003 0 0 3 0x40014200 acpi0 acpi0 79583 437759 0 0 3 0x40014200 idle1 43423 249907 0 0 3 0x14200 bored softnet3 69933 184974 0 0 3 0x14200 bored softnet2 17245 42921 0 0 3 0x14200 bored softnet1 79302 1631 0 0 3 0x14200 bored softnet0 3892 30162 0 0 3 0x14200 bored systqmp 36958 499761 0 0 3 0x14200 bored systq 49298 260513 0 0 3 0x14200 tmoslp softclockmp 83029 268914 0 0 2 0x40014200 softclock 74858 503488 0 0 3 0x40014200 idle0 1 163503 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff838f2430) #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 wakeup_n+0x54 sys/kern/kern_synch.c:580 #4 futex_requeue+0x143 sys/kern/sys_futex.c:296 #5 sys_futex+0x171 sys/kern/sys_futex.c:105 #6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 34703 (syz-executor) thread 0xffff8000ffff0a60 (27615) exclusive rwlock futex r = 0 (0xffffffff837e5518) #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 sys_futex+0x69 sys/kern/sys_futex.c:98 #3 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #4 Xsyscall+0x128 exclusive mutex &sched_lock r = 0 (0xffffffff838f2430) #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 wakeup_n+0x54 sys/kern/kern_synch.c:580 #4 futex_requeue+0x143 sys/kern/sys_futex.c:296 #5 sys_futex+0x171 sys/kern/sys_futex.c:105 #6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 33420 (syz-executor) thread 0xffff80002a291728 (311688) exclusive rrwlock inode r = 0 (0xfffffd806dd1a2f0) #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:524 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0x113 sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x102 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3117 #10 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8070d81678) #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:524 #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 domkdirat+0x8b sys/kern/vfs_syscalls.c:3102 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10222 11245K 11784K 166960K 12314 0 pcb 18 18K 19K 166960K 186 0 rtable 204 9K 9K 166960K 503 0 pf 36 18K 21K 166960K 100 0 ifaddr 34 5K 7K 166960K 70 0 ifgroup 47 2K 2K 166960K 98 0 sysctl 4 1K 1K 166960K 6 0 counters 60 35K 37K 166960K 104 0 ioctlops 0 0K 4K 166960K 1635 0 iov 0 0K 16K 166960K 31 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1459 92K 92K 166960K 1990 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 32 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 733 0 sigio 0 0K 0K 166960K 2 0 proc 72 91K 128K 166960K 652 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 2 0K 0K 166960K 66 0 in_multi 68 5K 7K 166960K 140 0 ether_multi 1 0K 0K 166960K 5 0 mrt 0 0K 0K 166960K 2 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 438 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 239 168K 185K 166960K 8407 0 UVM aobj 16 4K 4K 166960K 16 0 pinsyscall 42 84K 104K 166960K 1876 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 41 0 NDP 10 0K 2K 166960K 45 0 temp 57 8687K 8808K 166960K 20656 0 kqueue 14 22K 28K 166960K 112 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 78 0 74 1 0 1 1 0 8 0 rtentry 176 156 0 69 6 0 6 6 0 8 0 unpcb 144 613 0 590 8 6 2 6 0 8 1 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 808 312 0 307 11 10 1 11 0 8 0 arp 128 29 0 12 1 0 1 1 0 8 0 inpcb 384 1005 0 995 15 13 2 15 0 8 0 nd6 144 35 0 17 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 1 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 13 0 13 1 0 1 1 0 8 1 pppxif 1504 3 0 3 1 1 0 1 0 8 0 pffrag 232 3 0 1 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 5 0 3 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 6 0 2 1 0 1 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pfstitem 24 50 0 11 1 0 1 1 0 8 0 pfstkey 128 50 0 11 2 0 2 2 0 8 0 pfstate 384 50 0 11 5 0 5 5 0 8 0 pfrule 1344 25 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 571 0 233 29 6 23 29 0 8 0 art_table 32 572 0 233 4 0 4 4 0 8 0 art_node 16 152 0 74 1 0 1 1 0 8 0 sysvmsgpl 40 15 0 10 1 0 1 1 0 8 0 semapl 112 30 0 20 1 0 1 1 0 8 0 shmpl 112 13 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2602 0 1095 95 0 95 95 0 8 0 ffsino 288 2602 0 1095 109 0 109 109 0 8 0 nchpl 144 3636 0 1944 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 1 0 1 0 8 0 uvmvnodes 80 3127 0 0 64 0 64 64 0 8 0 vnodes 216 3127 0 0 174 0 174 174 0 8 0 namei 1024 12024 0 12023 3 2 1 2 0 8 0 percpumem 16 67 0 22 1 0 1 1 0 8 0 pfiaddrpl 120 2 0 0 1 0 1 1 0 8 0 kstatmem 264 50 0 30 2 0 2 2 0 8 0 scsiplug 72 4 0 4 1 1 0 1 0 8 0 scxspl 216 13253 0 13253 12 9 3 8 1 8 3 plimitpl 152 88 0 69 1 0 1 1 0 8 0 sigapl 424 1052 0 981 10 1 9 9 0 8 0 futexpl 64 8894 0 8891 1 0 1 1 0 8 0 knotepl 120 784 0 0 24 0 24 24 0 8 0 kqueuepl 224 203 0 193 3 2 1 3 0 8 0 pipepl 336 145 0 118 3 0 3 3 0 8 0 fdescpl 520 1012 0 981 3 0 3 3 0 8 0 filepl 160 5979 0 5620 23 7 16 18 0 8 0 lockfpl 104 223 0 221 1 0 1 1 0 8 0 lockfspl 48 104 0 102 1 0 1 1 0 8 0 sessionpl 144 26 0 18 1 0 1 1 0 8 0 pgrppl 48 106 0 90 1 0 1 1 0 8 0 ucredpl 104 508 0 494 1 0 1 1 0 8 0 zombiepl 144 983 0 981 1 0 1 1 0 8 0 processpl 1192 1052 0 981 6 0 6 6 0 8 0 procpl 656 2040 0 1961 8 0 8 8 0 8 0 srpgc 96 6 0 6 1 1 0 1 0 8 0 sosppl 168 7 0 7 1 1 0 1 0 8 0 sockpl 728 1705 0 1668 21 16 5 16 0 8 1 mcl64k 65536 4 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 mcl9k 9216 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 24 0 0 1 0 1 1 0 8 0 mbufpl 256 1179 0 0 74 0 74 74 0 8 0 bufpl 280 4418 0 130 307 0 307 307 0 8 0 anonpl 32 7733 0 0 63 0 63 63 0 246 0 amapchunkpl 152 26458 0 25843 36 6 30 30 0 158 4 amappl16 200 2822 0 2789 18 13 5 15 0 8 0 amappl15 192 22 0 22 2 2 0 1 0 8 0 amappl14 184 130 0 117 1 0 1 1 0 8 0 amappl13 176 7 0 7 2 2 0 1 0 8 0 amappl12 168 1699 0 1669 3 1 2 2 0 8 0 amappl11 160 81 0 67 1 0 1 1 0 8 0 amappl10 152 10 0 10 1 1 0 1 0 8 0 amappl9 144 250 0 249 1 0 1 1 0 8 0 amappl8 136 53 0 49 1 0 1 1 0 8 0 amappl7 128 112 0 100 1 0 1 1 0 8 0 amappl6 120 200 0 197 1 0 1 1 0 8 0 amappl5 112 167 0 156 1 0 1 1 0 8 0 amappl4 104 340 0 319 1 0 1 1 0 8 0 amappl3 96 5227 0 5123 5 1 4 4 0 8 0 amappl2 88 667 0 604 2 0 2 2 0 8 0 amappl1 80 10965 0 10361 15 1 14 15 0 8 0 amappl 88 7569 0 7403 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 15 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1012 0 981 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1012 0 981 1 0 1 1 0 8 0 vmmpekpl 168 9510 0 9465 3 0 3 3 0 8 0 vmmpepl 168 68579 0 66598 102 10 92 101 0 357 0 vmsppl 480 1011 0 981 5 0 5 5 0 8 0 rwobjpl 72 23084 0 19004 75 0 75 75 0 8 0 pdppl 4096 2031 0 1962 105 32 73 85 0 8 4 pvpl 32 16216 0 0 131 0 131 131 0 265 0 pmappl 256 1011 0 981 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 463 0 54 13 1 12 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83869ff0) 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_write_1(3f8,0,65) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:774 comcnputc(800,65) at comcnputc+0x1ab bus_space_barrier machine/bus.h:481 [inline] comcnputc(800,65) at comcnputc+0x1ab sys/dev/ic/com.c:1263 cnputc(65) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x843 sys/kern/subr_prf.c:-1 db_printf(ffffffff83378f19) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80002abedbd0) at db_ktrap+0x101 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80002abedbd0) at db_ktrap+0x101 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80002abedbd0) at kerntrap+0x1dc sys/arch/amd64/amd64/trap.c:323 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001486000) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:579 dtclose(11e5f,81,2000,ffff80002a2fd9d8) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80002a2fd9d8) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 end trace frame: 0xffff80002abedd70, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83869ff0) 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_write_1(3f8,0,65) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:774 comcnputc(800,65) at comcnputc+0x1ab bus_space_barrier machine/bus.h:481 [inline] comcnputc(800,65) at comcnputc+0x1ab sys/dev/ic/com.c:1263 cnputc(65) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x843 sys/kern/subr_prf.c:-1 db_printf(ffffffff83378f19) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80002abedbd0) at db_ktrap+0x101 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80002abedbd0) at db_ktrap+0x101 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80002abedbd0) at kerntrap+0x1dc sys/arch/amd64/amd64/trap.c:323 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001486000) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:579 dtclose(11e5f,81,2000,ffff80002a2fd9d8) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80002a2fd9d8) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002abedd80) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805ecdc380,81,fffffd807f7d35b0,ffff80002a2fd9d8) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd807a93b0b8,ffff80002a2fd9d8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd807a93b0b8,ffff80002a2fd9d8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd807a93b0b8,ffff80002a2fd9d8) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd807a93b0b8,ffff80002a2fd9d8) at closef+0x192 sys/kern/kern_descrip.c:1249 fdfree(ffff80002a2fd9d8) at fdfree+0x116 sys/kern/kern_descrip.c:1181 exit1(ffff80002a2fd9d8,0,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff80002a2fd9d8,ffff80002abee0f0,ffff80002abee040) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002abee0f0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002abee0f0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e5f54119500, count: -24 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x680 savectx() at savectx+0xae end of kernel end trace frame: 0x75fd9ab5e5e0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x75fd9ab5e5e0, count: -1