panic: kernel diagnostic assertion "sc->sc_dev == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/net/if_tun.c", line 305 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *190304 81600 0 0 0x4000000 0K syz-executor.6 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82576c22) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825e8afa,ffffffff82631b79,131,ffffffff825fcae4) at __assert+0x25 sys/kern/subr_prf.c:161 tun_clone_destroy(ffff800000d65800) at tun_clone_destroy+0x278 sys/net/if_tun.c:305 if_clone_destroy(ffff80002e1e53a0) at if_clone_destroy+0x132 sys/net/if.c:1218 soo_ioctl(fffffd80676bd440,80206979,ffff80002e1e53a0,ffff800027b33a50) at soo_ioctl+0x26c sys_ioctl(ffff800027b33a50,ffff80002e1e54b8,ffff80002e1e5510) at sys_ioctl+0x4a2 syscall(ffff80002e1e5580) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e1e5580) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfa28e234dd0, count: 6 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: kernel diagnostic assertion "sc->sc_dev == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/net/if_tun.c", line 305 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82576c22) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825e8afa,ffffffff82631b79,131,ffffffff825fcae4) at __assert+0x25 sys/kern/subr_prf.c:161 tun_clone_destroy(ffff800000d65800) at tun_clone_destroy+0x278 sys/net/if_tun.c:305 if_clone_destroy(ffff80002e1e53a0) at if_clone_destroy+0x132 sys/net/if.c:1218 soo_ioctl(fffffd80676bd440,80206979,ffff80002e1e53a0,ffff800027b33a50) at soo_ioctl+0x26c sys_ioctl(ffff800027b33a50,ffff80002e1e54b8,ffff80002e1e5510) at sys_ioctl+0x4a2 syscall(ffff80002e1e5580) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e1e5580) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfa28e234dd0, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e1e51b0 rbx 0xffffffff8294ebff cpu_info_full_primary+0x2bff rdx 0xffff800000be77c0 rcx 0 rax 0xffff800027b33a50 r8 0 r9 0x8080808080808080 r10 0x81347233965ad676 r11 0xaf93bf3846d986d0 r12 0xffffffff8294ea00 cpu_info_full_primary+0x2a00 r13 0 r14 0 r15 0x1 rip 0xffffffff815e8758 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e1e51a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.6) pid=190304 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff800027b32550,0xffff800027b32020 process=0xffff8000ffff29b0 user=0xffff80002e1e0000, vmspace=0xfffffd806efbc170 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 70635 328417 84874 0 2 0x480 syz-executor.2 70635 411246 84874 0 3 0x4000080 fsleep syz-executor.2 81600 157533 71054 0 2 0 syz-executor.6 *81600 190304 71054 0 7 0x4000000 syz-executor.6 99464 189502 21411 0 2 0 syz-executor.7 99464 507051 21411 0 3 0x4000080 fsleep syz-executor.7 35661 426736 38088 0 2 0 syz-executor.3 35661 495593 38088 0 3 0x4000080 fsleep syz-executor.3 51287 294828 42183 0 2 0 syz-executor.4 51287 263395 42183 0 3 0x4000080 fsleep syz-executor.4 21411 304837 93478 0 3 0x82 nanoslp syz-executor.7 28416 482425 0 0 3 0x14200 acct acct 15425 319240 1 0 3 0x100083 ttyin getty 84874 344669 93478 0 2 0x482 syz-executor.2 5565 267479 93478 0 2 0x2 syz-executor.5 57999 220185 93478 0 2 0x482 syz-executor.0 38088 260472 93478 0 3 0x82 nanoslp syz-executor.3 42183 239166 93478 0 2 0x482 syz-executor.4 71054 286943 93478 0 3 0x82 nanoslp syz-executor.6 15946 41297 93478 0 2 0x482 syz-executor.1 64947 500283 0 0 3 0x14280 nfsidl nfsio 92015 167675 0 0 3 0x14280 nfsidl nfsio 78979 275693 0 0 3 0x14280 nfsidl nfsio 63102 307525 0 0 3 0x14280 nfsidl nfsio 12482 517054 0 0 3 0x14280 nfsidl nfsio 94494 249432 0 0 3 0x14280 nfsidl nfsio 51910 261119 0 0 3 0x14280 nfsidl nfsio 64960 512075 0 0 3 0x14280 nfsidl nfsio 99986 423929 0 0 3 0x14280 nfsidl nfsio 80178 243002 0 0 3 0x14280 nfsidl nfsio 22474 249043 0 0 3 0x14280 nfsidl nfsio 14608 374191 0 0 3 0x14280 nfsidl nfsio 77356 508760 0 0 3 0x14280 nfsidl nfsio 15520 356735 0 0 3 0x14280 nfsidl nfsio 5893 463205 0 0 3 0x14280 nfsidl nfsio 88736 372584 0 0 3 0x14280 nfsidl nfsio 36699 475724 0 0 3 0x14280 nfsidl nfsio 16430 209985 0 0 3 0x14280 nfsidl nfsio 89965 438395 0 0 3 0x14280 nfsidl nfsio 23515 351605 0 0 3 0x14280 nfsidl nfsio 72818 435940 0 0 3 0x14200 bored sosplice 93478 479456 7795 0 3 0x82 kqread syz-fuzzer 93478 342829 7795 0 3 0x4000082 nanoslp syz-fuzzer 93478 54423 7795 0 3 0x4000082 thrsleep syz-fuzzer 93478 24474 7795 0 3 0x4000082 thrsleep syz-fuzzer 93478 219450 7795 0 3 0x4000082 nanoslp syz-fuzzer 93478 412415 7795 0 3 0x4000082 thrsleep syz-fuzzer 93478 61746 7795 0 3 0x4000082 thrsleep syz-fuzzer 93478 23126 7795 0 3 0x4000082 thrsleep syz-fuzzer 93478 413800 7795 0 3 0x4000082 thrsleep syz-fuzzer 93478 168535 7795 0 3 0x4000082 thrsleep syz-fuzzer 7795 405413 78798 0 3 0x10008a sigsusp ksh 78798 441288 41178 0 3 0x9a poll sshd 41178 366976 1 0 3 0x88 poll sshd 7186 162363 58976 74 3 0x100092 bpf pflogd 58976 273688 1 0 3 0x80 netio pflogd 97865 468547 690 73 3 0x100090 kqread syslogd 690 196146 1 0 3 0x100082 netio syslogd 38797 182485 1 0 3 0x100080 kqread resolvd 24196 162740 19589 77 3 0x100092 kqread dhcpleased 86990 255607 19589 77 3 0x100092 kqread dhcpleased 19589 430027 1 0 3 0x80 kqread dhcpleased 19790 114143 0 0 3 0x14200 bored smr 649 483767 0 0 2 0x14200 zerothread 2082 274717 0 0 3 0x14200 aiodoned aiodoned 47425 386102 0 0 3 0x14200 syncer update 45758 293800 0 0 3 0x14200 cleaner cleaner 39775 95048 0 0 3 0x14200 reaper reaper 10184 464687 0 0 3 0x14200 pgdaemon pagedaemon 88304 6538 0 0 3 0x14200 bored viomb 45130 371929 0 0 3 0x40014200 acpi0 acpi0 43848 444146 0 0 7 0x40014200 idle1 93545 339350 0 0 3 0x14200 bored softnet 96701 380621 0 0 3 0x14200 bored systqmp 4045 451472 0 0 3 0x14200 bored systq 43656 12512 0 0 2 0x40014200 softclock 6311 459657 0 0 3 0x40014200 idle0 1 504990 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 81600 (syz-executor.6) thread 0xffff800027b33a50 (190304) exclusive rwlock clonelk r = 0 (0xffffffff829a6370) #0 witness_lock+0x44d #1 if_clone_destroy+0x49 #2 soo_ioctl+0x26c #3 sys_ioctl+0x4a2 #4 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #4 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #5 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829ac850) #0 witness_lock+0x44d #1 soo_ioctl+0x25a sys/kern/sys_socket.c:136 #2 sys_ioctl+0x4a2 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 Process 5565 (syz-executor.5) thread 0xffff800027b322b0 (267479) exclusive rrwlock inode r = 0 (0xfffffd8067436e78) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vget+0x1d3 sys/kern/vfs_subr.c:677 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1318 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6e5 sys/kern/vfs_lookup.c:561 #11 namei+0x36a sys/kern/vfs_lookup.c:245 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1849 #13 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8064c20c50) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1849 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10230 6587K 8104K 78643K 63627 0 pcb 13 24K 28K 78643K 15529 0 rtable 275 33K 36K 78643K 6964 0 ifaddr 112 29K 32K 78643K 3045 0 sysctl 3 1K 5K 78643K 10 0 counters 60 36K 36K 78643K 632 0 ioctlops 0 0K 8K 78643K 8822 0 iov 0 0K 32K 78643K 2621 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1651 103K 103K 78643K 16944 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 13K 78643K 273 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 2822 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 15 53K 93K 78643K 26471 0 sigio 0 0K 0K 78643K 126 0 proc 70 87K 112K 78643K 3400 0 subproc 104 6K 6K 78643K 1052 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1428 0 in_multi 75 5K 6K 78643K 1794 0 ether_multi 1 0K 0K 78643K 230 0 mrt 1 0K 0K 78643K 90 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 259 1155K 1155K 78643K 259 0 exec 0 0K 2K 78643K 4387 0 pfkey data 0 0K 0K 78643K 13 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 7 26K 26K 78643K 7 0 UVM amap 710 1516K 5656K 78643K 333052 0 UVM aobj 133 7K 7K 78643K 137 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 1136 0 NDP 15 0K 2K 78643K 535 0 temp 171 4746K 8829K 78643K 166161 0 kqueue 10 14K 24K 78643K 1230 0 SYN cache 2 16K 16K 78643K 2 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 1678 0 1674 23 22 1 3 0 8 0 rtentry 112 1432 0 1349 4 0 4 4 0 8 0 unpcb 136 14285 0 14270 167 159 8 9 0 8 7 syncache 296 88 0 88 31 30 1 1 0 8 1 tcpqe 32 678 0 678 10 10 0 1 0 8 0 tcpcb 736 7380 0 7356 257 254 3 15 0 8 0 arp 120 194 0 181 1 0 1 1 0 8 0 inpcb 304 44486 0 44466 479 472 7 22 0 8 5 rttmr 72 32 0 32 10 10 0 1 0 8 0 nd6 48 350 0 330 1 0 1 1 0 8 0 pkpcb 40 168 0 168 18 18 0 1 0 8 0 kcovpl 48 80 0 72 1 0 1 1 0 8 0 ppxss 1248 85 0 85 23 23 0 1 0 8 0 pfstscr 40 74 0 74 10 10 0 1 0 8 0 pffrag 232 127 0 125 8 7 1 1 0 482 0 pffrnode 88 127 0 125 8 7 1 1 0 8 0 pffrent 40 1591 0 1589 12 11 1 1 0 8 0 pfosfp 40 1434 0 1010 5 0 5 5 0 8 0 pfosfpen 112 1434 0 719 21 0 21 21 0 8 0 pfrke_plain 168 75 0 68 4 3 1 1 0 8 0 pfrktable 1344 1245 0 1210 12 9 3 4 0 8 0 pftag 88 21 0 9 1 0 1 1 0 8 0 pfqueue 264 3 0 0 1 0 1 1 0 8 0 pfstitem 24 69 0 67 1 0 1 1 0 8 0 pfstkey 112 189 0 187 2 1 1 2 0 8 0 pfstate 320 125 0 123 4 3 1 4 0 8 0 pfsrctr 152 12 0 12 1 1 0 1 0 8 0 pfrule 1360 1997 0 1471 50 6 44 44 0 8 0 art_heap8 4096 10 0 8 4 2 2 3 0 8 0 art_heap4 256 6536 0 6076 68 38 30 34 0 8 0 art_table 32 6546 0 6084 6 2 4 5 0 8 0 art_node 16 1348 0 1274 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 0 1 0 1 1 0 8 0 semapl 112 2820 0 2810 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 35301 0 33799 95 0 95 95 0 8 0 ffsino 272 35301 0 33799 101 0 101 101 0 8 0 nchpl 144 68381 0 66756 63 0 63 63 0 8 0 rtmask 32 80 0 76 4 3 1 1 0 8 0 uvmvnodes 80 6169 0 0 126 0 126 126 0 8 0 vnodes 224 6169 0 0 363 0 363 363 0 8 0 namei 1024 235583 0 235583 10 9 1 2 0 8 1 percpumem 16 328 0 286 1 0 1 1 0 8 0 vcpupl 2048 255 0 0 32 0 32 32 0 8 0 vmpool 560 292 0 37 19 0 19 19 0 8 0 pfiaddrpl 120 523 0 422 11 7 4 4 0 8 0 scsiplug 72 6 0 6 2 2 0 1 0 8 0 scxspl 216 218625 0 218625 54 53 1 8 0 8 1 plimitpl 152 2606 0 2591 1 0 1 1 0 8 0 sigapl 424 26658 0 26594 8 0 8 8 0 8 0 futexpl 64 248025 0 248021 7 6 1 1 0 8 0 knotepl 112 258 0 0 4 0 4 4 0 8 0 kqueuepl 216 20190 0 20169 216 213 3 10 0 8 1 pipepl 336 5528 0 5499 159 156 3 11 0 8 0 fdescpl 496 26618 0 26590 6 2 4 5 0 8 0 filepl 152 198266 0 198015 329 311 18 25 0 8 7 lockfpl 104 7731 0 7726 16 15 1 2 0 8 0 lockfspl 48 2369 0 2366 1 0 1 1 0 8 0 sessionpl 144 99 0 82 1 0 1 1 0 8 0 pgrppl 48 199 0 182 1 0 1 1 0 8 0 ucredpl 96 19444 0 19429 1 0 1 1 0 8 0 zombiepl 144 26594 0 26592 3 2 1 1 0 8 0 processpl 1064 26658 0 26592 5 0 5 5 0 8 0 procpl 672 73556 0 73476 37 29 8 9 0 8 0 srpgc 96 108 0 108 27 27 0 1 0 8 0 sosppl 168 210 0 210 28 27 1 1 0 8 1 sockpl 480 60693 0 60661 1293 1281 12 42 0 8 7 mcl64k 65536 57 0 0 3 0 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 35 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 3 0 3 3 0 8 0 mcl4k 4096 30 0 0 4 2 2 3 0 8 0 mcl2k2 2112 19 0 0 2 0 2 2 0 8 0 mcl2k 2048 497 0 0 27 2 25 25 0 8 0 mtagpl 96 1581 0 0 21 0 21 21 0 8 0 mbufpl 256 5237 0 0 264 0 264 264 0 8 0 bufpl 288 46370 0 40052 453 1 452 453 0 8 0 anonpl 24 7471773 0 7442752 486 298 188 232 0 186 0 amapchunkpl 152 1232460 0 1231528 6751 6710 41 4426 0 158 0 amappl16 200 69726 0 68503 190 120 70 79 0 8 0 amappl15 192 3084 0 3075 1 0 1 1 0 8 0 amappl14 184 2402 0 2398 1 0 1 1 0 8 0 amappl13 176 2119 0 2116 1 0 1 1 0 8 0 amappl12 168 2109 0 2105 1 0 1 1 0 8 0 amappl11 160 3051 0 3035 1 0 1 1 0 8 0 amappl10 152 5940 0 5934 1 0 1 1 0 8 0 amappl9 144 4312 0 4308 1 0 1 1 0 8 0 amappl8 136 6758 0 6601 6 0 6 6 0 8 0 amappl7 128 4699 0 4681 1 0 1 1 0 8 0 amappl6 120 4300 0 4268 3 2 1 2 0 8 0 amappl5 112 27711 0 27680 2 0 2 2 0 8 0 amappl4 104 7843 0 7808 3 2 1 2 0 8 0 amappl3 96 4868 0 4846 1 0 1 1 0 8 0 amappl2 88 5568 0 5509 3 1 2 3 0 8 0 amappl1 80 474045 0 473472 27 13 14 19 0 8 1 amappl 88 330748 0 330372 13 3 10 10 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 72 136 0 4 3 0 3 3 0 8 0 uaddrrnd 24 26910 0 26627 2 0 2 2 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 26910 0 26627 2 0 2 2 0 8 0 vmmpekpl 168 192440 0 192336 6 1 5 5 0 8 0 vmmpepl 168 2420255 0 2416386 500 319 181 192 0 357 1 vmsppl 368 26909 0 26627 29 3 26 26 0 8 0 rwobjpl 56 572877 0 564140 151 25 126 128 0 8 0 pdppl 4096 53827 0 53509 1108 784 324 325 0 8 6 pvpl 32 12434503 0 12409395 855 613 242 314 0 265 20 pmappl 248 26909 0 26627 20 2 18 18 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 2677 0 1260 41 0 41 41 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82576c22) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825e8afa,ffffffff82631b79,131,ffffffff825fcae4) at __assert+0x25 sys/kern/subr_prf.c:161 tun_clone_destroy(ffff800000d65800) at tun_clone_destroy+0x278 sys/net/if_tun.c:305 if_clone_destroy(ffff80002e1e53a0) at if_clone_destroy+0x132 sys/net/if.c:1218 soo_ioctl(fffffd80676bd440,80206979,ffff80002e1e53a0,ffff800027b33a50) at soo_ioctl+0x26c sys_ioctl(ffff800027b33a50,ffff80002e1e54b8,ffff80002e1e5510) at sys_ioctl+0x4a2 syscall(ffff80002e1e5580) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e1e5580) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfa28e234dd0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020ce8ff0) at x86_ipi_db+0x1a 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+0x23 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020ce8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800020ce8ff0) at x86_ipi_db+0x1a 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+0x23 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020ce8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: -5