*cpu0: uvm_fault(0xfffffd805a3d25e0, 0x48, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7d2d289a23c0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a2fdd70 rbx 0 rdx 0 rcx 0xffff8000ffff3a00 rax 0x31 r8 0xffff80002a2fdca0 r9 0x1 r10 0xca86c0d324e0b0b3 r11 0x8e3aaa4671fd98b9 r12 0 r13 0 r14 0xffff8000ffff3a00 r15 0 rip 0xffffffff824523ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a2fdcf0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=348490 pid=85872 tcnt=1 stat=onproc flags process=2 proc=0 runpri=71, usrpri=71, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff3238,0xffff8000ffff34e0 process=0xffff80002a2c0018 user=0xffff80002a2f8000, vmspace=0xfffffd806e3ccb80 estcpu=21, cpticks=119, pctcpu=0.40, user=9, sys=100, intr=10 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 26380 131433 60561 0 2 0 syz-executor 26380 130301 60561 0 3 0x4000080 msgwait syz-executor 50787 504705 13483 60929 2 0x10 syz-executor 50787 270107 13483 60929 2 0x4000010 syz-executor 50787 63925 13483 60929 3 0x4000090 fsleep syz-executor 50787 306707 13483 60929 3 0x4000090 fsleep syz-executor 73236 124752 2950 60929 2 0x10 syz-executor 73236 160103 2950 60929 3 0x4000090 fsleep syz-executor 73236 398250 2950 60929 3 0x4000090 fsleep syz-executor 73236 25660 2950 60929 3 0x4000090 fsleep syz-executor 60561 47617 85872 0 3 0x82 nanoslp syz-executor 38296 91356 1 0 3 0x80 nanoslp init 2950 456317 85872 0 3 0x82 nanoslp syz-executor 21560 136381 0 0 3 0x14200 acct acct 99641 224248 0 0 3 0x14200 bored sosplice 3265 445033 0 0 3 0x14280 nfsidl nfsio 13817 200876 0 0 3 0x14280 nfsidl nfsio 15367 315368 0 0 3 0x14280 nfsidl nfsio 64663 447525 0 0 3 0x14280 nfsidl nfsio 76816 182105 0 0 3 0x14280 nfsidl nfsio 57566 435071 0 0 3 0x14280 nfsidl nfsio 6389 332705 0 0 3 0x14280 nfsidl nfsio 90266 25585 0 0 3 0x14280 nfsidl nfsio 79051 284470 0 0 3 0x14280 nfsidl nfsio 94101 153985 0 0 3 0x14280 nfsidl nfsio 90142 24497 0 0 3 0x14280 nfsidl nfsio 3915 262795 0 0 3 0x14280 nfsidl nfsio 69414 487627 0 0 3 0x14280 nfsidl nfsio 59967 297171 0 0 3 0x14280 nfsidl nfsio 11721 93182 0 0 3 0x14280 nfsidl nfsio 13286 307512 0 0 3 0x14280 nfsidl nfsio 92520 451322 0 0 3 0x14280 nfsidl nfsio 77218 366518 0 0 3 0x14280 nfsidl nfsio 12755 87502 0 0 3 0x14280 nfsidl nfsio 47158 199854 0 0 3 0x14280 nfsidl nfsio 13483 150968 85872 0 3 0x82 nanoslp syz-executor 5913 358729 85872 0 3 0x82 wait syz-executor 83860 283820 85872 0 3 0x82 wait syz-executor 31687 492817 85872 0 3 0x82 wait syz-executor 84784 250257 85872 0 3 0x2 biowait syz-executor 57890 36235 85872 0 3 0x82 nanoslp syz-executor *85872 348490 84938 0 7 0x2 syz-executor 84938 152214 31908 0 3 0x10008a sigsusp ksh 31908 296007 66653 0 3 0x98 kqread sshd-session 66653 299005 21259 0 3 0x92 kqread sshd-session 21259 485922 1 0 3 0x88 kqread sshd 78258 208643 13287 74 3 0x1100092 bpf pflogd 13287 75489 1 0 3 0x80 sbwait pflogd 87516 497967 14592 73 3 0x1100090 kqread syslogd 14592 336710 1 0 3 0x100082 sbwait syslogd 20585 243285 1 0 3 0x100080 kqread resolvd 91781 96344 32512 77 3 0x100092 kqread dhcpleased 76799 516639 32512 77 3 0x100092 kqread dhcpleased 32512 292158 1 0 3 0x80 kqread dhcpleased 34699 312398 0 0 3 0x14200 bored smr 80631 90942 0 0 2 0x14200 zerothread 83843 383119 0 0 3 0x14200 aiodoned aiodoned 3658 287415 0 0 3 0x14200 syncer update 66574 308486 0 0 3 0x14200 cleaner cleaner 46199 177823 0 0 2 0x14200 reaper 6609 294271 0 0 3 0x14200 pgdaemon pagedaemon 76959 12067 0 0 3 0x14200 bored viomb 23072 379292 0 0 3 0x40014200 acpi0 acpi0 1597 297354 0 0 3 0x40014200 idle1 90632 94313 0 0 3 0x14200 bored softnet7 84477 321021 0 0 3 0x14200 bored softnet6 7301 165421 0 0 3 0x14200 bored softnet5 95370 169408 0 0 3 0x14200 bored softnet4 47835 100008 0 0 3 0x14200 bored softnet3 42527 56017 0 0 3 0x14200 bored softnet2 39100 447708 0 0 3 0x14200 bored softnet1 31264 488685 0 0 3 0x14200 bored softnet0 67552 407279 0 0 3 0x14200 bored systqmp 11937 110889 0 0 3 0x14200 bored systq 39571 16462 0 0 3 0x14200 tmoslp softclockmp 54935 294322 0 0 3 0x40014200 tmoslp softclock 72174 380126 0 0 3 0x40014200 idle0 1 179995 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 (0xffffffff838be798) #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 sched_idle+0x1ac sys/kern/kern_sched.c:176 #4 proc_trampoline+0x10 Process 50787 (syz-executor) thread 0xffff800034c08a80 (270107) exclusive rwlock fdlock r = 0 (0xffff800035823930) #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 doopenat+0x18e sys/kern/vfs_syscalls.c:1105 #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 Process 84784 (syz-executor) thread 0xffff8000ffff22a8 (250257) exclusive rrwlock inode r = 0 (0xfffffd8068d3dc70) #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 vget+0x2a2 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:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c350eb0) #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 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #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 46199 (reaper) thread 0xffff8000ffffc008 (177823) exclusive rwlock kmmaplk r = 0 (0xffffffff838f3f30) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10219 11188K 12419K 166960K 13320 0 pcb 18 16K 17K 166960K 278 0 rtable 198 9K 9K 166960K 475 0 pf 36 18K 81K 166960K 142 0 ifaddr 42 7K 8K 166960K 112 0 ifgroup 56 2K 3K 166960K 175 0 sysctl 4 1K 9K 166960K 13 0 counters 68 36K 38K 166960K 332 0 ioctlops 0 0K 4K 166960K 1823 0 iov 0 0K 16K 166960K 48 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1523 96K 96K 166960K 2542 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 43 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 110K 166960K 1091 0 sigio 0 0K 0K 166960K 38 0 proc 63 99K 180K 166960K 710 0 subproc 72 4K 4K 166960K 99 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 280 0 in_multi 84 6K 7K 166960K 170 0 ether_multi 1 0K 0K 166960K 11 0 mrt 1 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 587 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 241 163K 187K 166960K 11866 0 UVM aobj 122 5K 5K 166960K 127 0 pinsyscall 41 82K 101K 166960K 2259 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 58 0 NDP 12 0K 2K 166960K 75 0 temp 67 8649K 8723K 166960K 63213 0 kqueue 14 22K 30K 166960K 191 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 120 165 0 161 3 2 1 3 0 8 0 rtentry 176 154 0 73 5 0 5 5 0 8 0 unpcb 144 1110 0 1093 14 12 2 10 0 8 1 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 454 0 447 16 12 4 7 0 8 3 arp 128 16 0 6 1 0 1 1 0 8 0 inpcb 328 1480 0 1468 14 7 7 12 0 8 5 nd6 144 27 0 9 1 0 1 1 0 8 0 pkpcb 40 6 0 6 3 2 1 1 0 8 1 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1192 117 0 117 1 0 1 1 0 8 1 pppxif 1504 10 0 10 2 1 1 1 0 8 1 pffrag 232 10 0 1 1 0 1 1 0 482 0 pffrnode 88 8 0 1 1 0 1 1 0 8 0 pffrent 40 43 0 34 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 1 1 1 0 1 0 8 0 pfstitem 24 69 0 19 1 0 1 1 0 8 0 pfstkey 128 69 0 19 2 0 2 2 0 8 0 pfstate 384 69 0 19 5 0 5 5 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 683 0 318 31 3 28 28 0 8 1 art_table 40 685 0 318 5 0 5 5 0 8 0 art_node 32 153 0 84 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 4 2 1 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 38 0 28 1 0 1 1 0 8 0 shmpl 112 124 0 5 5 1 4 4 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 3382 0 1875 96 0 96 96 0 8 0 ffsino 296 3382 0 1875 117 0 117 117 0 8 0 nchpl 144 4837 0 4300 64 30 34 64 0 8 8 rtmask 32 12 0 12 2 1 1 1 0 8 1 uvmvnodes 80 4256 0 0 87 0 87 87 0 8 0 vnodes 216 4256 0 0 237 0 237 237 0 8 0 namei 1024 17634 0 17634 2 1 1 2 0 8 1 percpumem 16 181 0 132 1 0 1 1 0 8 0 kstatmem 264 108 0 82 4 1 3 3 0 8 1 scsiplug 72 4 0 4 2 2 0 1 0 8 0 scxspl 216 28890 0 28889 11 8 3 8 1 8 2 plimitpl 152 202 0 185 1 0 1 1 0 8 0 sigapl 424 1408 0 1333 9 0 9 9 0 8 0 knotepl 120 342 0 0 11 0 11 11 0 8 0 kqueuepl 224 555 0 544 5 1 4 5 0 8 3 pipepl 344 265 0 238 3 0 3 3 0 8 0 fdescpl 528 1364 0 1333 3 0 3 3 0 8 0 filepl 160 9522 0 9294 24 10 14 20 0 8 3 lockfpl 104 553 0 551 2 1 1 2 0 8 0 lockfspl 48 260 0 258 1 0 1 1 0 8 0 sessionpl 144 27 0 19 1 0 1 1 0 8 0 pgrppl 48 114 0 98 1 0 1 1 0 8 0 ucredpl 104 1222 0 1207 1 0 1 1 0 8 0 zombiepl 144 1939 0 1935 1 0 1 1 0 8 0 processpl 1248 1408 0 1333 6 0 6 6 0 8 0 procpl 664 3101 0 3015 10 1 9 9 0 8 0 sosppl 168 7 0 7 2 1 1 1 0 8 1 sockpl 752 2815 0 2782 40 30 10 28 0 8 6 mcl64k 65536 5 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 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 105 0 0 14 0 14 14 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 33 0 0 5 0 5 5 0 8 0 mtagpl 96 15 0 0 1 0 1 1 0 8 0 mbufpl 256 1156 0 0 73 0 73 73 0 8 0 bufpl 280 11612 0 5469 440 0 440 440 0 8 0 anonpl 32 10107 0 0 83 1 82 82 0 246 0 amapchunkpl 152 41586 0 41076 42 12 30 36 0 158 6 amappl16 200 5274 0 5238 40 22 18 22 0 8 8 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 123 0 111 1 0 1 1 0 8 0 amappl13 176 9 0 9 1 1 0 1 0 8 0 amappl12 168 2054 0 2024 3 1 2 3 0 8 0 amappl11 160 52 0 38 1 0 1 1 0 8 0 amappl10 152 11 0 11 1 1 0 1 0 8 0 amappl9 144 274 0 274 1 1 0 1 0 8 0 amappl8 136 62 0 59 1 0 1 1 0 8 0 amappl7 128 114 0 103 1 0 1 1 0 8 0 amappl6 120 213 0 210 1 0 1 1 0 8 0 amappl5 112 140 0 130 1 0 1 1 0 8 0 amappl4 104 310 0 290 1 0 1 1 0 8 0 amappl3 96 7737 0 7621 4 0 4 4 0 8 0 amappl2 88 765 0 704 2 0 2 2 0 8 0 amappl1 80 12361 0 11785 15 2 13 14 0 8 0 amappl 88 10967 0 10795 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 128 255 0 255 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 126 0 5 3 0 3 3 0 8 0 uaddrrnd 24 1364 0 1333 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1364 0 1333 1 0 1 1 0 8 0 vmmpekpl 168 12579 0 12540 3 0 3 3 0 8 0 vmmpepl 168 91974 0 90012 122 19 103 107 0 357 6 vmsppl 488 1363 0 1333 6 1 5 5 0 8 0 rwobjpl 80 30895 0 25609 112 4 108 108 0 8 0 pdppl 4096 2735 0 2666 111 40 71 83 0 8 2 pvpl 32 19843 0 0 161 1 160 160 0 265 0 pmappl 256 1363 0 1333 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 363 0 60 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8380eff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:153 intr_handler(ffff80002a39a630,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xspllower() at Xspllower+0x1d cnputc(66) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(66) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1 db_printf(ffffffff8331482e) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff833d59e2) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80002a39aae0,48) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff80002a39aae0) at kerntrap+0x198 sys/arch/amd64/amd64/trap.c:491 end trace frame: 0xffff80002a39ab60, count: 0 ddb{0}> trace x86_ipi_db(ffffffff8380eff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:153 intr_handler(ffff80002a39a630,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xspllower() at Xspllower+0x1d cnputc(66) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(66) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1 db_printf(ffffffff8331482e) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff833d59e2) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80002a39aae0,48) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff80002a39aae0) at kerntrap+0x198 sys/arch/amd64/amd64/trap.c:491 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b witness_checkorder(28,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(18) at mtx_enter+0x4a sys/kern/kern_lock.c:260 clockintr_unbind(ffff800001624930,1) at clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 dt_ioctl_record_stop(ffff800001474000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:582 dtclose(11e5f,1,2000,ffff80002ebf6048) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,1,2000,ffff80002ebf6048) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002a39add0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805a8af010,1,fffffd80097fb1a0,ffff80002ebf6048) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805aaba248,ffff80002ebf6048) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805aaba248,ffff80002ebf6048) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805aaba248,ffff80002ebf6048) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805aaba248,ffff80002ebf6048) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002ebf6048) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002ebf6048,b,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002ebf6048,ffff80002a39b140,ffff80002a39b090) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a39b140) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a39b140) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7941775c1a20, count: -30 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7d2d289a23c0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7d2d289a23c0, count: -1