*cpu0: uvm_fault(0xfffffd80683eb000, 0x8, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7ac8ddd4e920, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a196560 rbx 0 rdx 0 rcx 0xffff8000ffffc7c0 rax 0x3b r8 0xffff80002a196490 r9 0xffff80002a19630c r10 0x98bb4b5a3c8f7eab r11 0x1c5edb82393a68e6 r12 0 r13 0 r14 0xffff8000ffffc7c0 r15 0 rip 0xffffffff827563ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a1964e0 ss 0x10 savectx+0xae: movl $0,%gs:0x660 ddb{1}> show proc PROC (sshd) tid=144017 pid=91271 tcnt=1 stat=onproc flags process=18000012 proc=0 runpri=24, usrpri=50, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff8000ffffc2a0,0xffff8000ffffca60 process=0xffff8000ffffac70 user=0xffff80002a191000, vmspace=0xfffffd807f004a50 estcpu=0, cpticks=0, pctcpu=0.11, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 13294 409734 28499 0 2 0x8000002 syz-executor.3 45058 170611 48697 32767 2 0x8000010 syz-executor.5 45058 80342 48697 32767 7 0xc000010 syz-executor.5 45058 334985 48697 32767 2 0xc000490 syz-executor.5 21627 300734 98895 32767 3 0x8000090 nanoslp syz-executor.7 21627 366261 98895 32767 3 0xc000090 ttyout syz-executor.7 21627 512380 98895 32767 3 0xc000090 fsleep syz-executor.7 90961 264753 40875 32767 2 0x8400010 syz-executor.0 90961 23383 40875 32767 3 0xc400090 kqread syz-executor.0 90961 37677 40875 32767 3 0xc400090 kqread syz-executor.0 90961 395645 40875 32767 3 0xc400090 fsleep syz-executor.0 40875 511222 4730 32767 3 0x8000090 nanoslp syz-executor.0 4730 149973 28499 0 3 0x8000082 wait syz-executor.0 59159 408671 12930 32767 2 0x8000010 syz-executor.4 12930 21766 28499 0 3 0x8000082 wait syz-executor.4 52738 258135 40859 32767 2 0x8000010 syz-executor.1 40859 479372 28499 0 3 0x8000082 wait syz-executor.1 98895 300247 79603 32767 3 0x8000090 nanoslp syz-executor.7 79603 305778 28499 0 3 0x8000082 wait syz-executor.7 85516 493784 14154 32767 2 0x8000010 syz-executor.6 14154 328847 28499 0 3 0x8000082 wait syz-executor.6 48697 74516 36764 32767 3 0x8000090 nanoslp syz-executor.5 36764 408366 28499 0 3 0x8000082 wait syz-executor.5 17793 273367 0 0 3 0x14200 bored sosplice 28499 355246 58860 0 3 0x1a000082 thrsleep syz-fuzzer 28499 102239 58860 0 3 0x1e000082 nanoslp syz-fuzzer 28499 241028 58860 0 3 0x1e000082 thrsleep syz-fuzzer 28499 497299 58860 0 3 0x1e000082 wait syz-fuzzer 28499 23495 58860 0 2 0x1e000002 syz-fuzzer 28499 207690 58860 0 3 0x1e000082 wait syz-fuzzer 28499 237497 58860 0 3 0x1e000082 thrsleep syz-fuzzer 28499 50580 58860 0 3 0x1e000082 wait syz-fuzzer 28499 265239 58860 0 3 0x1e000082 thrsleep syz-fuzzer 28499 142248 58860 0 3 0x1e000082 wait syz-fuzzer 28499 252617 58860 0 3 0x1e000082 thrsleep syz-fuzzer 28499 487491 58860 0 3 0x1e000082 wait syz-fuzzer 28499 425836 58860 0 3 0x1e000082 thrsleep syz-fuzzer 28499 272285 58860 0 3 0x1e000082 wait syz-fuzzer 28499 347151 58860 0 3 0x1e000082 wait syz-fuzzer 28499 51153 58860 0 3 0x1e000082 thrsleep syz-fuzzer 58860 52163 91271 0 3 0x810008a sigsusp ksh *91271 144017 19299 0 7 0x18000012 sshd 33784 390894 1 0 3 0x18100083 ttyin getty 19299 194579 1 0 3 0x18000088 kqread sshd 49417 322270 11730 73 3 0x19100090 kqread syslogd 11730 198412 1 0 3 0x18100082 sbwait syslogd 66541 242420 1 0 3 0x18100080 kqread resolvd 41873 114877 69455 77 3 0x18100092 kqread dhcpleased 75507 288783 69455 77 3 0x18100092 kqread dhcpleased 69455 194311 1 0 3 0x18000080 kqread dhcpleased 89955 26829 0 0 3 0x14200 bored smr 81181 343747 0 0 2 0x14200 zerothread 3113 277420 0 0 3 0x14200 aiodoned aiodoned 44146 331640 0 0 3 0x14200 syncer update 61920 418544 0 0 3 0x14200 cleaner cleaner 43807 275294 0 0 3 0x14200 reaper reaper 30244 345268 0 0 3 0x14200 pgdaemon pagedaemon 73605 245888 0 0 3 0x14200 bored viomb 49127 347647 0 0 3 0x40014200 acpi0 acpi0 13141 93813 0 0 3 0x40014200 idle1 96816 155956 0 0 3 0x14200 bored softnet3 43080 68645 0 0 3 0x14200 bored softnet2 68811 333339 0 0 3 0x14200 bored softnet1 62711 79485 0 0 2 0x14200 softnet0 94196 80213 0 0 3 0x14200 bored systqmp 66747 510541 0 0 3 0x14200 bored systq 87025 27939 0 0 3 0x14200 tmoslp softclockmp 33094 5060 0 0 2 0x40014200 softclock 47612 168589 0 0 3 0x40014200 idle0 1 159146 0 0 3 0x8000082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &kq->kq_lock r = 0 (0xfffffd806f07c370) #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_register+0xb52 sys/kern/kern_event.c:1261 #4 ppollregister_evts+0xa1 sys/kern/sys_generic.c:1048 #5 ppollregister+0x301 sys/kern/sys_generic.c:1146 #6 doppoll+0x199 sys/kern/sys_generic.c:963 #7 sys_ppoll+0x1b8 sys/kern/sys_generic.c:916 #8 syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] #8 syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 Process 13294 (syz-executor.3) thread 0xffff80002a20e2b0 (409734) exclusive rrwlock inode r = 0 (0xfffffd8069de9a28) #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 ufs_ihashins+0x46 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x1e4 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xe6 sys/ufs/ufs/ufs_vnops.c:1117 #8 VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388 #9 domkdirat+0x125 sys/kern/vfs_syscalls.c:3077 #10 syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] #10 syscall+0x854 sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8067e7dd60) #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 vfs_lookup+0xd3 sys/kern/vfs_lookup.c:418 #6 namei+0x56a sys/kern/vfs_lookup.c:250 #7 domkdirat+0x79 sys/kern/vfs_syscalls.c:3062 #8 syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] #8 syscall+0x854 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 Process 45058 (syz-executor.5) thread 0xffff800033f85c90 (80342) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82e80d90) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 #2 mi_switch+0x489 sys/kern/sched_bsd.c:470 #3 sleep_finish+0x194 sys/kern/kern_synch.c:414 #4 biowait+0x91 sys/kern/vfs_bio.c:1254 #5 bwrite+0x1fb sys/kern/vfs_bio.c:766 #6 VOP_BWRITE+0x4e sys/kern/vfs_vops.c:640 #7 ufs_direnter+0x60e sys/ufs/ufs/ufs_lookup.c:833 #8 ufs_makeinode+0x3c2 sys/ufs/ufs/ufs_vnops.c:1769 #9 ufs_symlink+0x4b sys/ufs/ufs/ufs_vnops.c:1298 #10 VOP_SYMLINK+0xd7 sys/kern/vfs_vops.c:426 #11 dosymlinkat+0x158 sys/kern/vfs_syscalls.c:1809 #12 syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] #12 syscall+0x854 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8067e7d3d0) #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 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ffs_inode_alloc+0x1e4 sys/ufs/ffs/ffs_alloc.c:393 #9 ufs_makeinode+0xb0 sys/ufs/ufs/ufs_vnops.c:1733 #10 ufs_symlink+0x4b sys/ufs/ufs/ufs_vnops.c:1298 #11 VOP_SYMLINK+0xd7 sys/kern/vfs_vops.c:426 #12 dosymlinkat+0x158 sys/kern/vfs_syscalls.c:1809 #13 syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] #13 syscall+0x854 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 Process 59159 (syz-executor.4) thread 0xffff800033f85770 (408671) exclusive rrwlock inode r = 0 (0xfffffd806b5c13d0) #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 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x1373 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6e5 sys/kern/vfs_lookup.c:566 #11 namei+0x56a sys/kern/vfs_lookup.c:250 #12 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1855 #13 syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] #13 syscall+0x854 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b7da0a0) #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 vfs_lookup+0xd3 sys/kern/vfs_lookup.c:418 #6 namei+0x56a sys/kern/vfs_lookup.c:250 #7 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1855 #8 syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] #8 syscall+0x854 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10194 6406K 6419K 166960K 11813 0 pcb 15 20K 24K 166960K 23 0 rtable 196 5K 7K 166960K 7171 0 pf 25 8K 8K 166960K 385 0 ifaddr 36 15K 18K 166960K 766 0 ifgroup 42 1K 2K 166960K 762 0 sysctl 4 1K 3K 166960K 17 0 counters 60 35K 36K 166960K 420 0 ioctlops 0 0K 2K 166960K 431 0 iov 1 2K 28K 166960K 2214 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1377 87K 87K 166960K 6414 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 13K 166960K 508 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 2313 0 dirhash 12 2K 3K 166960K 576 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 18 62K 125K 166960K 25821 0 sigio 0 0K 0K 166960K 717 0 proc 56 78K 115K 166960K 8437 0 subproc 78 4K 7K 166960K 2548 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 6199 0 in_multi 77 5K 7K 166960K 3285 0 ether_multi 1 0K 0K 166960K 181 0 mrt 1 0K 0K 166960K 10 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 217 970K 970K 166960K 217 0 exec 0 0K 1K 166960K 5369 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 323 61K 106K 166960K 226720 0 UVM aobj 131 4K 5K 166960K 141 0 pinsyscall 38 76K 111K 166960K 31723 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 1K 166960K 1886 0 NDP 9 0K 2K 166960K 561 0 temp 66 6811K 6940K 166960K 79198 0 kqueue 15 20K 34K 166960K 3578 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 2701 0 2698 8 7 1 3 0 8 0 rtentry 112 2215 0 2124 4 0 4 4 0 8 0 unpcb 144 22766 0 22745 110 108 2 10 0 8 1 syncache 336 768 0 768 36 35 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 690 0 690 54 53 1 1 0 8 1 tcpcb 808 15573 0 15500 106 97 9 21 0 8 0 arp 120 395 0 381 1 0 1 1 0 8 0 ipq 40 64 0 62 23 22 1 1 0 8 0 ipqe 40 711 0 709 23 22 1 1 0 8 0 inpcb 392 34628 0 34549 211 201 10 28 0 8 0 nd6 136 683 0 662 3 2 1 2 0 8 0 kcovpl 48 196 0 190 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 8813 0 8426 50 19 31 31 0 8 0 art_table 32 8814 0 8426 4 0 4 4 0 8 0 art_node 16 2214 0 2131 1 0 1 1 0 8 0 sysvmsgpl 40 22 0 14 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 2309 0 2299 1 0 1 1 0 8 0 shmpl 112 138 0 10 4 0 4 4 0 8 0 dirhash 1024 393 0 376 3 0 3 3 0 8 0 dino2pl 256 36209 0 34628 101 1 100 100 0 8 0 ffsino 272 36209 0 34628 107 0 107 107 0 8 0 nchpl 144 70685 0 68933 66 0 66 66 0 8 0 uvmvnodes 80 8007 0 0 164 0 164 164 0 8 0 vnodes 216 8007 0 0 445 0 445 445 0 8 0 namei 1024 238464 0 238462 11 10 1 2 0 8 0 percpumem 16 224 0 180 1 0 1 1 0 8 0 kstatmem 264 378 0 360 2 0 2 2 0 8 0 scxspl 216 248429 0 248429 126 123 3 8 1 8 3 plimitpl 152 5153 0 5133 4 2 2 2 0 8 0 sigapl 424 25732 0 25684 7 0 7 7 0 8 0 futexpl 64 333617 0 333615 3 2 1 1 0 8 0 knotepl 120 1934 0 0 19 3 16 16 0 8 0 kqueuepl 216 6940 0 6928 31 29 2 5 0 8 1 pipepl 320 4201 0 4176 38 34 4 8 0 8 1 fdescpl 496 25713 0 25684 7 2 5 6 0 8 0 filepl 152 158331 0 158110 152 139 13 20 0 8 0 lockfpl 104 5720 0 5718 2 1 1 2 0 8 0 lockfspl 48 1880 0 1878 1 0 1 1 0 8 0 sessionpl 144 201 0 187 1 0 1 1 0 8 0 pgrppl 48 497 0 483 1 0 1 1 0 8 0 ucredpl 104 30597 0 30581 1 0 1 1 0 8 0 zombiepl 144 25684 0 25684 1 0 1 1 0 8 1 processpl 1136 25732 0 25684 5 0 5 5 0 8 0 procpl 656 56336 0 56266 13 5 8 8 0 8 0 sosppl 168 1010 0 1003 2 1 1 1 0 8 0 sockpl 584 60859 0 60756 246 236 10 25 0 8 0 mcl64k 65536 43 0 0 4 1 3 3 0 8 0 mcl16k 16384 30 0 0 3 0 3 3 0 8 0 mcl12k 12288 50 0 0 2 0 2 2 0 8 0 mcl9k 9216 25 0 0 2 0 2 2 0 8 0 mcl8k 8192 28 0 0 4 1 3 3 0 8 0 mcl4k 4096 113 0 0 4 1 3 3 0 8 0 mcl2k2 2112 13 0 0 1 0 1 1 0 8 0 mcl2k 2048 1243 0 0 38 17 21 32 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 2531 0 0 71 0 71 71 0 8 0 bufpl 280 49000 0 40993 573 0 573 573 0 8 0 anonpl 24 3084450 0 3078390 246 170 76 95 0 186 0 amapchunkpl 152 713931 0 713256 223 189 34 49 0 158 1 amappl16 200 82735 0 82645 328 310 18 32 0 8 1 amappl15 192 26 0 25 1 0 1 1 0 8 0 amappl14 184 716 0 706 2 1 1 2 0 8 0 amappl13 176 72 0 72 37 36 1 1 0 8 1 amappl12 168 29114 0 29083 2 0 2 2 0 8 0 amappl11 160 54 0 44 1 0 1 1 0 8 0 amappl10 152 269 0 261 1 0 1 1 0 8 0 amappl9 144 338 0 338 63 62 1 1 0 8 1 amappl8 136 4340 0 4176 8 0 8 8 0 8 0 amappl7 128 420 0 405 1 0 1 1 0 8 0 amappl6 120 3195 0 3160 3 1 2 2 0 8 0 amappl5 112 1310 0 1298 1 0 1 1 0 8 0 amappl4 104 3003 0 2935 4 1 3 3 0 8 0 amappl3 96 138169 0 138087 7 3 4 4 0 8 0 amappl2 88 28971 0 28839 6 2 4 4 0 8 0 amappl1 80 112053 0 111551 23 10 13 22 0 8 0 amappl 88 221884 0 221689 7 0 7 7 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 72 140 0 10 3 0 3 3 0 8 0 uaddrrnd 24 25713 0 25684 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 25713 0 25684 1 0 1 1 0 8 0 vmmpekpl 168 176820 0 176765 4 0 4 4 0 8 0 vmmpepl 168 1582917 0 1580839 346 218 128 136 0 357 1 vmsppl 440 25712 0 25684 5 0 5 5 0 8 0 rwobjpl 56 381270 0 371878 160 23 137 139 0 8 0 pdppl 4096 51433 0 51368 1406 1331 75 95 0 8 10 pvpl 32 47682 0 0 389 4 385 385 0 265 0 pmappl 248 25712 0 25684 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2194 0 1751 14 0 14 14 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82ce6ff0) 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_1(3f8,5) at x86_bus_space_io_read_1+0x2e sys/arch/amd64/amd64/bus_space.c:654 comcnputc(800,67) at comcnputc+0x1a7 sys/dev/ic/com.c:1270 cnputc(67) at cnputc+0x4f sys/dev/cons.c:218 db_putchar(67) at db_putchar+0x3eb sys/ddb/db_output.c:155 kprintf() at kprintf+0x21c1 sys/kern/subr_prf.c:1064 db_printf(ffffffff828904ad) at db_printf+0x89 sys/kern/subr_prf.c:498 db_ktrap(6,0,ffff80002ccd60d0) at db_ktrap+0xf9 db_printtrap sys/arch/amd64/amd64/db_interface.c:101 [inline] db_ktrap(6,0,ffff80002ccd60d0) at db_ktrap+0xf9 sys/arch/amd64/amd64/db_interface.c:127 kerntrap(ffff80002ccd60d0) at kerntrap+0x142 sys/arch/amd64/amd64/trap.c:323 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b fifo_write(ffff80002ccd61c0) at fifo_write+0x4f sys/miscfs/fifofs/fifo_vnops.c:273 VOP_WRITE(fffffd805fadea38,ffff80002ccd6258,8,fffffd807f7d7888) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245 end trace frame: 0xffff80002ccd62f0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff82ce6ff0) 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_1(3f8,5) at x86_bus_space_io_read_1+0x2e sys/arch/amd64/amd64/bus_space.c:654 comcnputc(800,67) at comcnputc+0x1a7 sys/dev/ic/com.c:1270 cnputc(67) at cnputc+0x4f sys/dev/cons.c:218 db_putchar(67) at db_putchar+0x3eb sys/ddb/db_output.c:155 kprintf() at kprintf+0x21c1 sys/kern/subr_prf.c:1064 db_printf(ffffffff828904ad) at db_printf+0x89 sys/kern/subr_prf.c:498 db_ktrap(6,0,ffff80002ccd60d0) at db_ktrap+0xf9 db_printtrap sys/arch/amd64/amd64/db_interface.c:101 [inline] db_ktrap(6,0,ffff80002ccd60d0) at db_ktrap+0xf9 sys/arch/amd64/amd64/db_interface.c:127 kerntrap(ffff80002ccd60d0) at kerntrap+0x142 sys/arch/amd64/amd64/trap.c:323 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b fifo_write(ffff80002ccd61c0) at fifo_write+0x4f sys/miscfs/fifofs/fifo_vnops.c:273 VOP_WRITE(fffffd805fadea38,ffff80002ccd6258,8,fffffd807f7d7888) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd805fadea38,ffff80002a197400,1fb,0,1,592e5366def5b204,ffff80002ccd6380,fffffd805fadea38,78) at vn_rdwr+0xee sys/kern/vfs_vnops.c:324 ufs_symlink(ffff80002ccd6380) at ufs_symlink+0x172 sys/ufs/ufs/ufs_vnops.c:1314 VOP_SYMLINK(fffffd807a81dcb8,ffff80002ccd6500,ffff80002ccd6530,ffff80002ccd6430,ffff80002a197400) at VOP_SYMLINK+0xd7 sys/kern/vfs_vops.c:426 dosymlinkat(ffff800033f85c90,20000000,ffffff9c,20000200) at dosymlinkat+0x158 sys/kern/vfs_syscalls.c:1809 syscall(ffff80002ccd66b0) at syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] syscall(ffff80002ccd66b0) at syscall+0x854 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x333ad43a0a0, count: -20 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x660 savectx() at savectx+0xae end of kernel end trace frame: 0x7ac8ddd4e920, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7ac8ddd4e920, count: -1