witness: lock_object uninitialized: 0xffff800000e80028 Starting stack trace... witness_checkorder(ffff800000e80028,9,0) at witness_checkorder+0x137 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff800000e80028,9,0) at witness_checkorder+0x137 sys/kern/subr_witness.c:777 rw_enter_write(ffff800000e80018) at rw_enter_write+0x5c sys/kern/kern_rwlock.c:128 unveil_delete_names(ffff800000e80000) at unveil_delete_names+0x34 unvname_rbt_RBT_MIN sys/kern/kern_unveil.c:92 [inline] unveil_delete_names(ffff800000e80000) at unveil_delete_names+0x34 sys/kern/kern_unveil.c:102 unveil_destroy(ffff800027b9e1a0) at unveil_destroy+0xad sys/kern/kern_unveil.c:183 exit1(ffff8000212baff0,0,0,3) at exit1+0x3d8 sys/kern/kern_exit.c:222 single_thread_check_locked(ffff8000212baff0,0,0) at single_thread_check_locked+0x237 sys/kern/kern_sig.c:2013 userret(ffff8000212baff0) at userret+0x7c single_thread_check sys/kern/kern_sig.c:2052 [inline] userret(ffff8000212baff0) at userret+0x7c sys/kern/kern_sig.c:1968 Xsyscall() at Xsyscall+0x156 end of kernel end trace frame: 0x75b5306cf600, count: 249 End of stack trace. Stopped at db_enter+0x1c: addq $0x8,%rsp ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(ffff800000e80028,9,0) at witness_checkorder+0x13c witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff800000e80028,9,0) at witness_checkorder+0x13c sys/kern/subr_witness.c:777 rw_enter_write(ffff800000e80018) at rw_enter_write+0x5c sys/kern/kern_rwlock.c:128 unveil_delete_names(ffff800000e80000) at unveil_delete_names+0x34 unvname_rbt_RBT_MIN sys/kern/kern_unveil.c:92 [inline] unveil_delete_names(ffff800000e80000) at unveil_delete_names+0x34 sys/kern/kern_unveil.c:102 unveil_destroy(ffff800027b9e1a0) at unveil_destroy+0xad sys/kern/kern_unveil.c:183 exit1(ffff8000212baff0,0,0,3) at exit1+0x3d8 sys/kern/kern_exit.c:222 single_thread_check_locked(ffff8000212baff0,0,0) at single_thread_check_locked+0x237 sys/kern/kern_sig.c:2013 userret(ffff8000212baff0) at userret+0x7c single_thread_check sys/kern/kern_sig.c:2052 [inline] userret(ffff8000212baff0) at userret+0x7c sys/kern/kern_sig.c:1968 Xsyscall() at Xsyscall+0x156 end of kernel end trace frame: 0x75b5306cf600, count: -9 ddb{0}> show registers rdi 0 rsi 0x4000000000000000 rbp 0xffff80002afe37a0 rbx 0x3 rdx 0 rcx 0xffff8000212baff0 rax 0xffffffff82b86ff0 cpu_info_full_primary+0x1ff0 r8 0xffff80002afe3740 r9 0x8080808080808080 r10 0xffff80002afe3690 r11 0xac9da47a8bf6eb1f r12 0xffff800000e80001 r13 0xffff800000e80028 r14 0 r15 0 rip 0xffffffff82730c8c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002afe3790 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.3) tid=157892 pid=99629 tcnt=1 stat=onproc flags process=1008 proc=82000 runpri=32, usrpri=77, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000211d97f0 forw=0xffffffffffffffff, list=0xffff800021224808,0xffff800021225ab0 process=0xffff800027b9e1a0 user=0xffff80002afde000, vmspace=0xfffffd807eff93a0 estcpu=27, cpticks=13, pctcpu=0.2, user=0, sys=10, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 8969 191716 5557 0 2 0 syz-executor.2 8969 82644 5557 0 3 0x4000080 fsleep syz-executor.2 96180 124871 26807 0 2 0 syz-executor.7 96180 165515 26807 0 2 0x4000000 syz-executor.7 52409 194294 19837 0 2 0 syz-executor.1 52409 320177 19837 0 3 0x4000080 fsleep syz-executor.1 52409 103171 19837 0 3 0x4000080 fsleep syz-executor.1 81571 265725 56621 0 2 0 syz-executor.6 81571 262593 56621 0 2 0x4000000 syz-executor.6 81571 466705 56621 0 3 0x4000080 fsleep syz-executor.6 81571 445577 56621 0 3 0x4000080 fsleep syz-executor.6 60138 116785 20642 0 2 0 syz-executor.5 60138 376378 20642 0 3 0x4000080 fsleep syz-executor.5 60138 312872 20642 0 3 0x4000080 fsleep syz-executor.5 56621 319186 81680 0 2 0x482 syz-executor.6 20642 386330 81680 0 2 0x482 syz-executor.5 38834 144377 0 0 3 0x14200 acct acct 26807 498310 81680 0 2 0x482 syz-executor.7 97015 88964 1 0 2 0x100083 getty 46232 7878 0 0 3 0x14280 nfsidl nfsio 4166 221307 0 0 3 0x14280 nfsidl nfsio 29412 341641 0 0 3 0x14280 nfsidl nfsio 72892 173348 0 0 3 0x14280 nfsidl nfsio 91719 150084 0 0 3 0x14280 nfsidl nfsio 18987 203106 0 0 3 0x14280 nfsidl nfsio 50802 403949 0 0 3 0x14280 nfsidl nfsio 37620 241326 0 0 3 0x14280 nfsidl nfsio 85733 383601 0 0 3 0x14280 nfsidl nfsio 36321 483319 0 0 3 0x14280 nfsidl nfsio 58156 37211 0 0 3 0x14280 nfsidl nfsio 83680 314532 0 0 3 0x14280 nfsidl nfsio 21771 239416 0 0 3 0x14280 nfsidl nfsio 29155 318483 0 0 3 0x14280 nfsidl nfsio 20883 108242 0 0 3 0x14280 nfsidl nfsio 24746 62678 0 0 3 0x14280 nfsidl nfsio 54536 205502 0 0 3 0x14280 nfsidl nfsio 55202 108535 0 0 3 0x14280 nfsidl nfsio 40654 120844 0 0 3 0x14280 nfsidl nfsio 97882 9379 0 0 3 0x14280 nfsidl nfsio 5557 344891 81680 0 2 0x482 syz-executor.2 95820 231902 81680 0 2 0x2 syz-executor.0 51812 181743 81680 0 2 0x2 syz-executor.4 59464 153599 81680 0 2 0x482 syz-executor.3 19837 155712 81680 0 2 0x482 syz-executor.1 78622 364361 0 0 3 0x14200 bored sosplice 81680 44104 93522 0 3 0x2000082 thrsleep syz-fuzzer 81680 458699 93522 0 2 0x6000482 syz-fuzzer 81680 490259 93522 0 3 0x6000082 thrsleep syz-fuzzer 81680 200954 93522 0 3 0x6000082 wait syz-fuzzer 81680 479832 93522 0 3 0x6000082 thrsleep syz-fuzzer 81680 435593 93522 0 3 0x6000082 wait syz-fuzzer 81680 13498 93522 0 3 0x6000082 thrsleep syz-fuzzer 81680 156205 93522 0 3 0x6000082 wait syz-fuzzer 81680 344079 93522 0 3 0x6000082 wait syz-fuzzer 81680 382534 93522 0 3 0x6000082 thrsleep syz-fuzzer 81680 433659 93522 0 3 0x6000082 thrsleep syz-fuzzer 81680 453902 93522 0 3 0x6000082 wait syz-fuzzer 81680 111627 93522 0 3 0x6000082 wait syz-fuzzer 81680 337729 93522 0 3 0x6000082 wait syz-fuzzer 81680 424177 93522 0 2 0x6000482 syz-fuzzer 81680 90640 93522 0 3 0x6000082 wait syz-fuzzer 93522 125395 71888 0 3 0x10008a sigsusp ksh 71888 33110 91468 0 3 0x9a kqread sshd 91468 57457 1 0 3 0x88 kqread sshd 10117 492836 21124 74 3 0x1100092 bpf pflogd 21124 496702 1 0 3 0x80 netio pflogd 86918 343877 76172 73 2 0x1100090 syslogd 76172 338335 1 0 3 0x100082 netio syslogd 35192 299764 1 0 3 0x100080 kqread resolvd 32366 23720 32199 77 3 0x100092 kqread dhcpleased 65308 211545 32199 77 3 0x100092 kqread dhcpleased 32199 72192 1 0 3 0x80 kqread dhcpleased 49505 236809 0 0 3 0x14200 bored smr 47515 160013 0 0 2 0x14200 zerothread 26050 75732 0 0 3 0x14200 aiodoned aiodoned 52931 470362 0 0 3 0x14200 syncer update 93027 498910 0 0 3 0x14200 cleaner cleaner 59417 404133 0 0 3 0x14200 reaper reaper 24100 205247 0 0 3 0x14200 pgdaemon pagedaemon 11786 178787 0 0 3 0x14200 bored viomb 90998 7982 0 0 3 0x40014200 acpi0 acpi0 22435 354007 0 0 7 0x40014200 idle1 38509 293656 0 0 3 0x14200 bored softnet3 95918 283388 0 0 3 0x14200 bored softnet2 9576 480192 0 0 3 0x14200 bored softnet1 51237 385685 0 0 3 0x14200 bored softnet0 16516 77212 0 0 3 0x14200 bored systqmp 10198 157567 0 0 3 0x14200 bored systq 59704 79494 0 0 2 0x40014200 softclock 63013 40234 0 0 3 0x40014200 idle0 1 175657 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 96180 (syz-executor.7) thread 0xffff800021224ab0 (124871) exclusive rwlock vmmaplk r = 0 (0xfffffd806efc3100) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 vm_map_lock_ln+0xfa sys/uvm/uvm_map.c:5345 #3 uvm_map_protect+0xdc uvm_map_addr_RBT_ROOT sys/uvm/uvm_map.h:176 [inline] #3 uvm_map_protect+0xdc uvm_map_entrybyaddr sys/uvm/uvm_map.c:526 [inline] #3 uvm_map_protect+0xdc sys/uvm/uvm_map.c:3135 #4 sys_mprotect+0x25e sys/uvm/uvm_mmap.c:585 #5 syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] #5 syscall+0x606 sys/arch/amd64/amd64/trap.c:623 #6 Xsyscall+0x128 Process 81571 (syz-executor.6) thread 0xffff80002124aaa0 (262593) exclusive rwlock futex r = 0 (0xffffffff82bff510) #0 witness_lock+0x447 #1 sys_futex+0x60 sys/kern/sys_futex.c:98 #2 syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] #2 syscall+0x606 sys/arch/amd64/amd64/trap.c:623 #3 Xsyscall+0x128 Process 95820 (syz-executor.0) thread 0xffff8000211d8008 (231902) exclusive rwlock vmmaplk r = 0 (0xfffffd8069a6f850) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 vm_map_lock_ln+0xfa sys/uvm/uvm_map.c:5345 #3 uvmspace_fork+0xb6 sys/uvm/uvm_map.c:3903 #4 process_new+0x304 sys/kern/kern_fork.c:262 #5 fork1+0x318 sys/kern/kern_fork.c:383 #6 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #6 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #7 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffffd8069a6fbf0) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 vm_map_lock_ln+0xfa sys/uvm/uvm_map.c:5345 #3 uvmspace_fork+0x3b sys/uvm/uvm_map.c:3894 #4 process_new+0x304 sys/kern/kern_fork.c:262 #5 fork1+0x318 sys/kern/kern_fork.c:383 #6 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #6 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10235 6515K 8643K 78643K 67688 0 pcb 13 16K 18K 78643K 1065 0 rtable 245 7K 7K 78643K 1919 0 pf 37 10K 10K 78643K 277 0 ifaddr 47 17K 18K 78643K 282 0 ifgroup 64 2K 2K 78643K 473 0 sysctl 3 0K 2K 78643K 38 0 counters 64 36K 36K 78643K 292 0 ioctlops 0 0K 4K 78643K 1625 0 iov 0 0K 24K 78643K 1645 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1688 106K 106K 78643K 15847 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 3 5K 13K 78643K 241 0 VM map 2 1K 1K 78643K 2 0 sem 11 1K 1K 78643K 79 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 16 57K 85K 78643K 17341 0 sigio 0 0K 0K 78643K 467 0 proc 74 115K 128K 78643K 2295 0 subproc 104 6K 6K 78643K 585 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 7530 0 in_multi 99 7K 7K 78643K 650 0 ether_multi 1 0K 0K 78643K 13 0 mrt 1 0K 0K 78643K 17 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 247 1102K 1102K 78643K 247 0 exec 0 0K 1K 78643K 3570 0 pfkey data 0 0K 0K 78643K 4 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 470 99K 103K 78643K 167379 0 UVM aobj 131 4K 4K 78643K 134 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 497 0 NDP 14 0K 2K 78643K 218 0 temp 74 5924K 6012K 78643K 150887 0 kqueue 12 18K 32K 78643K 1159 0 SYN cache 2 824K 832K 78643K 3 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 671 0 667 8 7 1 4 0 8 0 rtentry 112 550 0 436 4 0 4 4 0 8 0 unpcb 144 8474 0 8459 85 84 1 9 0 8 0 syncache 304 120 0 120 24 24 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 166 0 166 18 18 0 1 0 8 0 tcpcb 808 4788 0 4774 194 191 3 15 0 8 0 arp 120 98 0 80 1 0 1 1 0 8 0 inpcb 368 14338 0 14320 258 254 4 17 0 8 0 nd6 136 151 0 123 2 0 2 2 0 8 0 pkpcb 40 39 0 39 11 11 0 1 0 8 0 kcovpl 48 45 0 37 1 0 1 1 0 8 0 ppxss 1256 24 0 24 8 8 0 1 0 8 0 pffrag 232 140 0 140 6 6 0 1 0 482 0 pffrnode 88 138 0 138 6 6 0 1 0 8 0 pffrent 40 332 0 332 6 6 0 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 24 417 0 405 1 0 1 1 0 8 0 pfstkey 128 417 0 405 2 1 1 2 0 8 0 pfstate 376 417 0 405 11 8 3 5 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 2174 0 1692 32 1 31 31 0 8 0 art_table 32 2175 0 1692 4 0 4 4 0 8 0 art_node 16 539 0 435 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 14 2 2 0 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 9 0 0 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 24669 0 23118 98 0 98 98 0 8 0 ffsino 272 24669 0 23118 104 0 104 104 0 8 0 nchpl 144 48198 0 47685 63 40 23 63 0 8 0 uvmvnodes 80 28576 0 0 584 0 584 584 0 8 0 vnodes 216 28576 0 0 1588 0 1588 1588 0 8 0 namei 1024 172385 0 172385 9 8 1 2 0 8 1 percpumem 16 159 0 114 1 0 1 1 0 8 0 kstatmem 264 256 0 228 4 1 3 3 0 8 0 scxspl 216 138570 0 138570 24 23 1 8 1 8 1 plimitpl 152 1455 0 1439 1 0 1 1 0 8 0 sigapl 424 17732 0 17663 11 3 8 8 0 8 0 futexpl 64 175094 0 175086 3 2 1 1 0 8 0 knotepl 120 1153 0 0 20 3 17 19 0 8 0 kqueuepl 216 2935 0 2927 60 55 5 7 0 8 4 pipepl 320 3421 0 3393 105 99 6 13 0 8 3 fdescpl 496 17571 0 17542 5 1 4 5 0 8 0 filepl 152 112290 0 112049 191 177 14 20 0 8 3 lockfpl 104 21128 0 21115 39 38 1 4 0 8 0 lockfspl 48 8657 0 8644 4 3 1 2 0 8 0 sessionpl 144 63 0 46 1 0 1 1 0 8 0 pgrppl 48 237 0 220 1 0 1 1 0 8 0 ucredpl 104 15146 0 15132 1 0 1 1 0 8 0 zombiepl 144 18452 0 18451 5 4 1 1 0 8 0 processpl 1072 17732 0 17663 7 2 5 5 0 8 0 procpl 680 46368 0 46275 27 18 9 10 0 8 0 sosppl 168 222 0 222 19 19 0 1 0 8 0 sockpl 488 23600 0 23563 492 484 8 32 0 8 0 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 11 0 0 2 0 2 2 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 11 0 0 1 0 1 1 0 8 0 mcl8k 8192 26 0 0 4 1 3 3 0 8 0 mcl4k 4096 27 0 0 3 0 3 3 0 8 0 mcl2k2 2112 10 0 0 1 0 1 1 0 8 0 mcl2k 2048 342 0 0 32 11 21 32 0 8 0 mtagpl 96 2043 0 0 43 0 43 43 0 8 0 mbufpl 256 3597 0 0 201 0 201 201 0 8 0 bufpl 288 32093 0 25764 453 0 453 453 0 8 0 anonpl 24 1673213 0 1659220 203 99 104 125 0 186 0 amapchunkpl 152 525161 0 524205 50 8 42 48 0 158 0 amappl16 200 34504 0 34013 177 150 27 43 0 8 1 amappl15 192 42 0 40 1 0 1 1 0 8 0 amappl14 184 284 0 267 3 2 1 2 0 8 0 amappl13 176 21 0 19 1 0 1 1 0 8 0 amappl12 168 18867 0 18832 3 1 2 2 0 8 0 amappl11 160 55 0 41 1 0 1 1 0 8 0 amappl10 152 105 0 90 2 1 1 1 0 8 0 amappl9 144 279 0 277 1 0 1 1 0 8 0 amappl8 136 790 0 609 7 0 7 7 0 8 0 amappl7 128 162 0 146 2 0 2 2 0 8 0 amappl6 120 595 0 569 2 1 1 2 0 8 0 amappl5 112 626 0 615 1 0 1 1 0 8 0 amappl4 104 1093 0 1041 3 1 2 3 0 8 0 amappl3 96 104352 0 104257 4 1 3 3 0 8 0 amappl2 88 18387 0 18312 3 1 2 3 0 8 0 amappl1 80 74013 0 73459 23 10 13 23 0 8 0 amappl 88 166113 0 165835 8 1 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 72 133 0 3 3 0 3 3 0 8 0 uaddrrnd 24 17571 0 17541 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 17571 0 17541 1 0 1 1 0 8 0 vmmpekpl 168 128936 0 128884 4 1 3 3 0 8 0 vmmpepl 168 1047833 0 1045197 448 315 133 145 0 357 4 vmsppl 464 17570 0 17541 5 1 4 5 0 8 0 rwobjpl 56 273533 0 243078 439 9 430 430 0 8 0 pdppl 4096 35150 0 35082 669 599 70 80 0 8 2 pvpl 32 4605821 0 4585655 547 358 189 363 0 265 0 pmappl 248 17570 0 17541 3 1 2 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2104 0 1093 30 0 30 30 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(ffff800000e80028,9,0) at witness_checkorder+0x13c witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff800000e80028,9,0) at witness_checkorder+0x13c sys/kern/subr_witness.c:777 rw_enter_write(ffff800000e80018) at rw_enter_write+0x5c sys/kern/kern_rwlock.c:128 unveil_delete_names(ffff800000e80000) at unveil_delete_names+0x34 unvname_rbt_RBT_MIN sys/kern/kern_unveil.c:92 [inline] unveil_delete_names(ffff800000e80000) at unveil_delete_names+0x34 sys/kern/kern_unveil.c:102 unveil_destroy(ffff800027b9e1a0) at unveil_destroy+0xad sys/kern/kern_unveil.c:183 exit1(ffff8000212baff0,0,0,3) at exit1+0x3d8 sys/kern/kern_exit.c:222 single_thread_check_locked(ffff8000212baff0,0,0) at single_thread_check_locked+0x237 sys/kern/kern_sig.c:2013 userret(ffff8000212baff0) at userret+0x7c single_thread_check sys/kern/kern_sig.c:2052 [inline] userret(ffff8000212baff0) at userret+0x7c sys/kern/kern_sig.c:1968 Xsyscall() at Xsyscall+0x156 end of kernel end trace frame: 0x75b5306cf600, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020d58ff0) 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 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020d58ff0) at sched_idle+0x41e sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -5