*cpu0: uvm_fault(0xfffffd80693afa50, 0x8, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x2c0301fd0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a28af90 rbx 0 rdx 0 rcx 0xffff80002a20b738 rax 0x32 r8 0xffff80002a28aec0 r9 0x1 r10 0x877d6a7973406477 r11 0x52839cc32e3e5e76 r12 0 r13 0 r14 0xffff80002a20b738 r15 0 rip 0xffffffff824373ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a28af10 ss 0x10 savectx+0xae: movl $0,%gs:0x660 ddb{1}> show proc PROC (syz-fuzzer) tid=151303 pid=10751 tcnt=16 stat=onproc flags process=1a000002 proc=4000000 runpri=24, usrpri=50, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff8000ffff79c0,0xffff80002a20b228 process=0xffff80002a159638 user=0xffff80002a285000, vmspace=0xfffffd806efada58 estcpu=0, cpticks=0, pctcpu=0.11, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 80356 186649 43177 0 2 0x8000000 syz-executor.5 80356 155171 43177 0 3 0xc000080 netcon syz-executor.5 80238 115475 95333 0 2 0x8000000 syz-executor.2 80238 413050 95333 0 3 0xc000080 kqread syz-executor.2 65761 194581 33864 0 2 0x8000000 syz-executor.3 65761 403360 33864 0 3 0xc000080 fsleep syz-executor.3 56172 480255 6727 0 3 0x8000090 nanoslp syz-executor.1 56172 228573 6727 0 3 0xc000090 lockf syz-executor.1 56172 57955 6727 0 3 0xc000090 fsleep syz-executor.1 85629 228725 85360 0 3 0x8000080 nanoslp syz-executor.7 85629 324246 85360 0 3 0xc000080 kqread syz-executor.7 85629 279152 85360 0 3 0xc000080 fsleep syz-executor.7 22254 50192 14139 0 3 0x8000080 nanoslp syz-executor.0 22254 106466 14139 0 3 0xc000080 netcon syz-executor.0 22254 188991 14139 0 3 0xc000080 fsleep syz-executor.0 56 68546 37085 0 3 0x8000080 nanoslp syz-executor.6 56 55010 37085 0 3 0xc000080 sbwait syz-executor.6 56 411807 37085 0 3 0xc000080 sbwait syz-executor.6 56 338919 37085 0 3 0xc000080 fsleep syz-executor.6 95333 367186 10751 0 2 0x8000002 syz-executor.2 43177 117904 10751 0 3 0x8000082 nanoslp syz-executor.5 1444 244923 1 0 3 0x18100083 ttyin getty 37085 345258 10751 0 2 0x8000482 syz-executor.6 14139 433257 10751 0 3 0x8000082 nanoslp syz-executor.0 62420 242441 10751 0 7 0x8000003 syz-executor.4 6727 39900 10751 0 3 0x8000082 nanoslp syz-executor.1 85360 421134 10751 0 3 0x8000082 nanoslp syz-executor.7 23741 284086 0 0 3 0x14280 nfsidl nfsio 11952 418477 0 0 3 0x14280 nfsidl nfsio 62333 464388 0 0 3 0x14280 nfsidl nfsio 91586 255869 0 0 3 0x14280 nfsidl nfsio 30877 480075 0 0 3 0x14280 nfsidl nfsio 85963 152613 0 0 3 0x14280 nfsidl nfsio 27035 486371 0 0 3 0x14280 nfsidl nfsio 52846 278474 0 0 3 0x14280 nfsidl nfsio 2864 465968 0 0 3 0x14280 nfsidl nfsio 16954 68688 0 0 3 0x14280 nfsidl nfsio 31494 490857 0 0 3 0x14280 nfsidl nfsio 4262 61461 0 0 3 0x14280 nfsidl nfsio 5805 4074 0 0 3 0x14280 nfsidl nfsio 15791 458550 0 0 3 0x14280 nfsidl nfsio 44998 362093 0 0 3 0x14280 nfsidl nfsio 40716 226789 0 0 3 0x14280 nfsidl nfsio 9018 36437 0 0 3 0x14280 nfsidl nfsio 22008 8524 0 0 3 0x14280 nfsidl nfsio 50836 448497 0 0 3 0x14280 nfsidl nfsio 60616 113905 0 0 3 0x14280 nfsidl nfsio 355 378916 0 0 3 0x14200 bored sosplice 33864 85604 10751 0 2 0x8000002 syz-executor.3 10751 207102 70153 0 3 0x1a000082 thrsleep syz-fuzzer 10751 224453 70153 0 3 0x1e000082 thrsleep syz-fuzzer 10751 452589 70153 0 3 0x1e000082 wait syz-fuzzer 10751 270941 70153 0 3 0x1e000082 wait syz-fuzzer 10751 300974 70153 0 3 0x1e000082 wait syz-fuzzer 10751 304310 70153 0 3 0x1e000082 thrsleep syz-fuzzer 10751 431963 70153 0 3 0x1e000082 thrsleep syz-fuzzer 10751 518184 70153 0 3 0x1e000082 thrsleep syz-fuzzer 10751 213029 70153 0 3 0x1e000082 wait syz-fuzzer *10751 151303 70153 0 7 0x1e000002 syz-fuzzer 10751 458676 70153 0 3 0x1e000082 thrsleep syz-fuzzer 10751 110913 70153 0 3 0x1e000082 wait syz-fuzzer 10751 94367 70153 0 3 0x1e000082 thrsleep syz-fuzzer 10751 180980 70153 0 3 0x1e000082 wait syz-fuzzer 10751 140036 70153 0 3 0x1e000082 wait syz-fuzzer 10751 418597 70153 0 3 0x1e000082 wait syz-fuzzer 70153 154084 71333 0 3 0x810008a sigsusp ksh 71333 197194 85373 0 3 0x1800009a kqread sshd 85373 514083 1 0 3 0x18000088 kqread sshd 65704 78427 11934 74 3 0x19100092 bpf pflogd 11934 396585 1 0 3 0x18000080 sbwait pflogd 94838 468058 45064 73 2 0x19100010 syslogd 45064 257628 1 0 3 0x18100082 sbwait syslogd 34554 174469 1 0 3 0x18100080 kqread resolvd 3576 99466 75952 77 3 0x18100092 kqread dhcpleased 25337 45237 75952 77 3 0x18100092 kqread dhcpleased 75952 505258 1 0 3 0x18000080 kqread dhcpleased 87603 146859 0 0 3 0x14200 bored smr 37716 215249 0 0 2 0x14200 zerothread 44020 515845 0 0 3 0x14200 aiodoned aiodoned 45381 396865 0 0 3 0x14200 syncer update 20586 226330 0 0 3 0x14200 cleaner cleaner 87723 420622 0 0 3 0x14200 reaper reaper 58526 336237 0 0 3 0x14200 pgdaemon pagedaemon 18309 161446 0 0 3 0x14200 bored viomb 94954 9002 0 0 3 0x40014200 acpi0 acpi0 31712 189213 0 0 3 0x40014200 idle1 84438 344312 0 0 3 0x14200 bored softnet3 2359 412479 0 0 3 0x14200 bored softnet2 14269 296045 0 0 3 0x14200 bored softnet1 73475 151930 0 0 3 0x14200 bored softnet0 54511 368308 0 0 3 0x14200 bored systqmp 13999 278815 0 0 3 0x14200 bored systq 67263 174637 0 0 3 0x14200 tmoslp softclockmp 33580 234599 0 0 3 0x40014200 tmoslp softclock 61350 521960 0 0 3 0x40014200 idle0 1 114201 0 0 3 0x8080082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &kq->kq_lock r = 0 (0xfffffd806f127298) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 mtx_enter_try+0x103 #2 mtx_enter+0x4e sys/kern/kern_lock.c:266 #3 kqueue_scan+0x7cf sys/kern/kern_event.c:1510 #4 sys_kevent+0x567 sys/kern/kern_event.c:1062 #5 syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] #5 syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 #6 Xsyscall+0x128 Process 62420 (syz-executor.4) thread 0xffff80002a22d4c8 (242441) exclusive rrwlock inode r = 0 (0xfffffd806d94da30) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 rw_enter+0x32a sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8e sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x85 sys/kern/vfs_vnops.c:564 #5 vget+0x1fd sys/kern/vfs_subr.c:676 #6 ktrwriteraw+0x13c sys/kern/kern_ktrace.c:679 #7 ktrgenio+0x256 ktrwrite2 sys/kern/kern_ktrace.c:644 [inline] #7 ktrgenio+0x256 sys/kern/kern_ktrace.c:258 #8 dofilewritev+0x393 sys/kern/sys_generic.c:396 #9 sys_write+0x87 sys/kern/sys_generic.c:295 #10 syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] #10 syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82db7898) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 ktrgenio+0x1dd #2 dofilewritev+0x393 sys/kern/sys_generic.c:396 #3 sys_write+0x87 sys/kern/sys_generic.c:295 #4 syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] #4 syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 #5 Xsyscall+0x128 Process 94838 (syslogd) thread 0xffff8000ffffdc40 (468058) exclusive rrwlock inode r = 0 (0xfffffd806e7a45f0) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 rw_enter+0x32a sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8e sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x85 sys/kern/vfs_vnops.c:564 #5 sys_fsync+0xf1 sys/kern/vfs_syscalls.c:2904 #6 syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] #6 syscall+0x854 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10197 6499K 6690K 166960K 12594 0 pcb 18 14K 15K 166960K 259 0 rtable 192 7K 9K 166960K 1042 0 pf 30 9K 10K 166960K 117 0 ifaddr 37 14K 16K 166960K 137 0 ifgroup 51 2K 2K 166960K 185 0 sysctl 4 1K 1K 166960K 4 0 counters 62 36K 36K 166960K 130 0 ioctlops 0 0K 4K 166960K 1565 0 iov 0 0K 20K 166960K 205 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1434 90K 90K 166960K 2756 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 13K 166960K 39 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 191 0 dirhash 12 2K 3K 166960K 81 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 17 61K 81K 166960K 2408 0 sigio 1 0K 0K 166960K 14 0 proc 70 91K 115K 166960K 1182 0 subproc 104 6K 6K 166960K 325 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 377 0 in_multi 73 5K 7K 166960K 352 0 ether_multi 1 0K 0K 166960K 9 0 mrt 0 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 145 652K 652K 166960K 145 0 exec 0 0K 1K 166960K 911 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 344 80K 101K 166960K 23462 0 UVM aobj 61 3K 3K 166960K 72 0 pinsyscall 41 82K 108K 166960K 4077 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 115 0 NDP 13 0K 1K 166960K 95 0 temp 78 6816K 6948K 166960K 132928 0 kqueue 12 18K 30K 166960K 319 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 155 0 152 1 0 1 1 0 8 0 rtentry 112 322 0 238 4 0 4 4 0 8 1 unpcb 144 2519 0 2498 21 20 1 6 0 8 0 syncache 336 16 0 16 6 6 0 1 0 8 0 tcpqe 32 67 0 67 6 6 0 1 0 8 0 tcpcb 808 660 0 647 11 9 2 8 0 8 0 arp 120 57 0 43 1 0 1 1 0 8 0 inpcb 392 2223 0 2200 27 24 3 9 0 8 0 nd6 136 80 0 64 1 0 1 1 0 8 0 pkpcb 40 7 0 7 3 3 0 1 0 8 0 kcovpl 48 25 0 17 1 0 1 1 0 8 0 ppxss 1168 6 0 6 3 3 0 1 0 8 0 pffrag 232 33 0 26 1 0 1 1 0 482 0 pffrnode 88 33 0 26 1 0 1 1 0 8 0 pffrent 40 532 0 525 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 pfstitem 24 144 0 112 1 0 1 1 0 8 0 pfstkey 128 145 0 113 3 0 3 3 0 8 0 pfstate 376 145 0 113 7 2 5 7 0 8 0 pfrule 1344 21 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 1246 0 897 36 13 23 30 0 8 1 art_table 32 1247 0 897 4 0 4 4 0 8 0 art_node 16 318 0 242 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 6 1 0 1 1 0 8 0 semapl 112 189 0 179 1 0 1 1 0 8 0 shmpl 112 69 0 11 2 0 2 2 0 8 0 dirhash 1024 63 0 46 3 0 3 3 0 8 0 dino2pl 256 5190 0 3633 98 0 98 98 0 8 0 ffsino 272 5190 0 3633 104 0 104 104 0 8 0 nchpl 144 8661 0 6913 67 1 66 67 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 29611 0 29611 5 4 1 2 0 8 1 percpumem 16 79 0 34 1 0 1 1 0 8 0 vcpupl 2048 2 0 1 2 1 1 1 0 8 0 vmpool 696 4 0 3 2 1 1 1 0 8 0 kstatmem 264 90 0 68 2 0 2 2 0 8 0 scsiplug 72 8 0 8 2 2 0 1 0 8 0 scxspl 216 32360 0 32360 17 15 2 8 1 8 2 plimitpl 152 366 0 349 1 0 1 1 0 8 0 sigapl 424 2724 0 2655 12 3 9 9 0 8 0 futexpl 64 27108 0 27103 2 1 1 1 0 8 0 knotepl 120 385 0 0 11 0 11 11 0 8 0 kqueuepl 216 516 0 506 3 2 1 3 0 8 0 pipepl 320 385 0 356 3 0 3 3 0 8 0 fdescpl 496 2681 0 2651 7 2 5 5 0 8 0 filepl 152 16318 0 16045 34 22 12 18 0 8 0 lockfpl 104 1030 0 1025 4 3 1 2 0 8 0 lockfspl 48 408 0 404 1 0 1 1 0 8 0 sessionpl 144 44 0 27 1 0 1 1 0 8 0 pgrppl 48 58 0 41 1 0 1 1 0 8 0 ucredpl 104 2530 0 2517 1 0 1 1 0 8 0 zombiepl 144 2655 0 2655 3 2 1 1 0 8 1 processpl 1136 2724 0 2655 6 0 6 6 0 8 0 procpl 656 5529 0 5433 10 1 9 9 0 8 0 srpgc 96 12 0 12 4 4 0 1 0 8 0 sosppl 168 116 0 116 6 5 1 1 0 8 1 sockpl 664 4986 0 4939 47 42 5 14 0 8 0 mcl64k 65536 19 0 0 3 0 3 3 0 8 1 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 13 0 0 2 0 2 2 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 10 0 0 2 0 2 2 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 311 0 0 39 0 39 39 0 8 0 mtagpl 96 35 0 0 1 0 1 1 0 8 0 mbufpl 256 1297 0 0 74 0 74 74 0 8 0 bufpl 280 9902 0 3647 447 0 447 447 0 8 0 anonpl 24 384512 0 378140 106 42 64 67 0 186 7 amapchunkpl 152 73789 0 73071 49 15 34 36 0 158 2 amappl16 200 8011 0 7900 36 26 10 19 0 8 0 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 227 0 211 2 1 1 2 0 8 0 amappl13 176 16 0 15 2 1 1 1 0 8 0 amappl12 168 3659 0 3626 3 1 2 2 0 8 0 amappl11 160 62 0 47 1 0 1 1 0 8 0 amappl10 152 82 0 67 1 0 1 1 0 8 0 amappl9 144 202 0 201 3 2 1 1 0 8 0 amappl8 136 464 0 364 4 0 4 4 0 8 0 amappl7 128 73 0 57 1 0 1 1 0 8 0 amappl6 120 575 0 555 2 1 1 2 0 8 0 amappl5 112 275 0 260 1 0 1 1 0 8 0 amappl4 104 758 0 718 2 0 2 2 0 8 0 amappl3 96 14808 0 14717 3 0 3 3 0 8 0 amappl2 88 3205 0 3125 3 1 2 3 0 8 0 amappl1 80 19055 0 18508 23 10 13 23 0 8 0 amappl 88 22599 0 22382 6 0 6 6 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 71 0 11 2 0 2 2 0 8 0 uaddrrnd 24 2685 0 2654 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2685 0 2654 1 0 1 1 0 8 0 vmmpekpl 168 22329 0 22266 4 0 4 4 0 8 0 vmmpepl 168 179620 0 177509 152 51 101 117 0 357 0 vmsppl 440 2684 0 2654 5 1 4 4 0 8 0 rwobjpl 56 53347 0 46134 108 5 103 103 0 8 0 pdppl 4096 5377 0 5309 221 149 72 77 0 8 4 pvpl 32 45432 0 0 370 3 367 367 0 265 0 pmappl 248 2684 0 2654 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 617 0 187 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82c74ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 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+0x2e sys/arch/amd64/amd64/bus_space.c:666 acpitimer_delay(1) at acpitimer_delay+0x4f acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x4f sys/dev/acpi/acpitimer.c:120 comcnputc(800,70) at comcnputc+0x1d7 sys/dev/ic/com.c:1270 cnputc(70) at cnputc+0x4f sys/dev/cons.c:218 db_putchar(70) at db_putchar+0x3eb sys/ddb/db_output.c:155 kprintf() at kprintf+0x21c1 sys/kern/subr_prf.c:1064 db_printf(ffffffff8288ff42) at db_printf+0x89 sys/kern/subr_prf.c:498 db_ktrap(6,0,ffff800030ad1ed0) at db_ktrap+0xf9 db_printtrap sys/arch/amd64/amd64/db_interface.c:101 [inline] db_ktrap(6,0,ffff800030ad1ed0) at db_ktrap+0xf9 sys/arch/amd64/amd64/db_interface.c:127 kerntrap(ffff800030ad1ed0) at kerntrap+0x142 sys/arch/amd64/amd64/trap.c:323 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b fifo_write(ffff800030ad1fc0) at fifo_write+0x4f sys/miscfs/fifofs/fifo_vnops.c:273 end trace frame: 0xffff800030ad2030, count: 0 ddb{0}> trace x86_ipi_db(ffffffff82c74ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 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+0x2e sys/arch/amd64/amd64/bus_space.c:666 acpitimer_delay(1) at acpitimer_delay+0x4f acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x4f sys/dev/acpi/acpitimer.c:120 comcnputc(800,70) at comcnputc+0x1d7 sys/dev/ic/com.c:1270 cnputc(70) at cnputc+0x4f sys/dev/cons.c:218 db_putchar(70) at db_putchar+0x3eb sys/ddb/db_output.c:155 kprintf() at kprintf+0x21c1 sys/kern/subr_prf.c:1064 db_printf(ffffffff8288ff42) at db_printf+0x89 sys/kern/subr_prf.c:498 db_ktrap(6,0,ffff800030ad1ed0) at db_ktrap+0xf9 db_printtrap sys/arch/amd64/amd64/db_interface.c:101 [inline] db_ktrap(6,0,ffff800030ad1ed0) at db_ktrap+0xf9 sys/arch/amd64/amd64/db_interface.c:127 kerntrap(ffff800030ad1ed0) at kerntrap+0x142 sys/arch/amd64/amd64/trap.c:323 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b fifo_write(ffff800030ad1fc0) at fifo_write+0x4f sys/miscfs/fifofs/fifo_vnops.c:273 VOP_WRITE(fffffd8064e8d600,ffff800030ad2078,3,fffffd807f7d7270) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a22d4c8,fffffd8064e8d600,fffffd807f7d7270,ffff800030ad2148,ffff800030ad2120) at ktrwriteraw+0x16b sys/kern/kern_ktrace.c:682 ktrgenio(ffff80002a22d4c8,f8,1,ffff8000006bc500,c) at ktrgenio+0x256 ktrwrite2 sys/kern/kern_ktrace.c:644 [inline] ktrgenio(ffff80002a22d4c8,f8,1,ffff8000006bc500,c) at ktrgenio+0x256 sys/kern/kern_ktrace.c:258 dofilewritev(ffff80002a22d4c8,f8,ffff800030ad22c8,0,ffff800030ad2380) at dofilewritev+0x393 sys/kern/sys_generic.c:396 sys_write(ffff80002a22d4c8,ffff800030ad2430,ffff800030ad2380) at sys_write+0x87 sys/kern/sys_generic.c:295 syscall(ffff800030ad2430) at syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] syscall(ffff800030ad2430) at syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e35d34be840, count: -21 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x660 savectx() at savectx+0xae end of kernel end trace frame: 0x2c0301fd0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x2c0301fd0, count: -1