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 *508810 3161 0 0 0x4000000 0K syz-executor.7 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8257abd3) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825eecca,ffffffff8263a0f6,131,ffffffff82604eda) at __assert+0x25 sys/kern/subr_prf.c:161 tun_clone_destroy(ffff800000e0a800) at tun_clone_destroy+0x278 sys/net/if_tun.c:305 if_clone_destroy(ffff80002c96a000) at if_clone_destroy+0x132 sys/net/if.c:1218 soo_ioctl(fffffd8058406608,80206979,ffff80002c96a000,ffff80002e393ce8) at soo_ioctl+0x26c sys_ioctl(ffff80002e393ce8,ffff80002c96a118,ffff80002c96a170) at sys_ioctl+0x4a2 syscall(ffff80002c96a1e0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002c96a1e0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdc931d94a90, 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(ffffffff8257abd3) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825eecca,ffffffff8263a0f6,131,ffffffff82604eda) at __assert+0x25 sys/kern/subr_prf.c:161 tun_clone_destroy(ffff800000e0a800) at tun_clone_destroy+0x278 sys/net/if_tun.c:305 if_clone_destroy(ffff80002c96a000) at if_clone_destroy+0x132 sys/net/if.c:1218 soo_ioctl(fffffd8058406608,80206979,ffff80002c96a000,ffff80002e393ce8) at soo_ioctl+0x26c sys_ioctl(ffff80002e393ce8,ffff80002c96a118,ffff80002c96a170) at sys_ioctl+0x4a2 syscall(ffff80002c96a1e0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002c96a1e0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdc931d94a90, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002c969e10 rbx 0xffffffff82906bff cpu_info_full_primary+0x2bff rdx 0xffff800000dd1540 rcx 0 rax 0xffff80002e393ce8 r8 0 r9 0x8080808080808080 r10 0x3dc0f0053689e2a7 r11 0xe657e57e6c2855bb r12 0xffffffff82906a00 cpu_info_full_primary+0x2a00 r13 0 r14 0 r15 0x1 rip 0xffffffff81111978 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002c969e00 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.7) pid=508810 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff80002e392008,0xffff80002e393a58 process=0xffff800029110018 user=0xffff80002c965000, vmspace=0xfffffd80600038a8 estcpu=33, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 60258 395067 66877 0 2 0 syz-executor.3 60258 274357 66877 0 3 0x4000080 fsleep syz-executor.3 96180 77407 74163 0 2 0 syz-executor.0 96180 213110 74163 0 3 0x4000080 fsleep syz-executor.0 11384 387669 72030 0 2 0 syz-executor.2 11384 160596 72030 0 3 0x4000080 fsleep syz-executor.2 3161 461158 40240 0 2 0 syz-executor.7 * 3161 508810 40240 0 7 0x4000000 syz-executor.7 86615 268131 99067 0 2 0x10 syz-executor.5 86615 28945 99067 0 3 0x4000090 fsleep syz-executor.5 76302 242775 75454 0 2 0 syz-executor.4 76302 364870 75454 0 3 0x4000080 fifor syz-executor.4 43881 104759 69800 0 3 0x80 nanoslp syz-executor.6 43881 204810 69800 0 3 0x4000080 rest syz-executor.6 43881 499560 69800 0 3 0x4000080 fsleep syz-executor.6 43881 145272 69800 0 3 0x4000080 fsleep syz-executor.6 75454 186358 51875 0 2 0x482 syz-executor.4 69800 188899 51875 0 2 0x482 syz-executor.6 42073 293125 51875 0 2 0x2 syz-executor.1 40240 328559 51875 0 2 0x482 syz-executor.7 74163 445113 51875 0 2 0x482 syz-executor.0 72030 106938 51875 0 2 0x482 syz-executor.2 58590 216299 1 0 3 0x100083 ttyin getty 66877 263890 51875 0 2 0x482 syz-executor.3 99067 44728 51875 0 3 0x82 nanoslp syz-executor.5 90417 252741 0 0 3 0x14280 nfsidl nfsio 34242 242187 0 0 3 0x14280 nfsidl nfsio 3141 475473 0 0 3 0x14280 nfsidl nfsio 64540 296398 0 0 3 0x14280 nfsidl nfsio 10421 263781 0 0 3 0x14280 nfsidl nfsio 41667 401699 0 0 3 0x14280 nfsidl nfsio 87716 488274 0 0 3 0x14280 nfsidl nfsio 73732 214429 0 0 3 0x14280 nfsidl nfsio 86808 381751 0 0 3 0x14280 nfsidl nfsio 10867 272139 0 0 3 0x14280 nfsidl nfsio 82283 421239 0 0 3 0x14280 nfsidl nfsio 31633 523886 0 0 3 0x14280 nfsidl nfsio 52539 34654 0 0 3 0x14280 nfsidl nfsio 79520 22278 0 0 3 0x14280 nfsidl nfsio 8653 231050 0 0 3 0x14280 nfsidl nfsio 70088 119276 0 0 3 0x14280 nfsidl nfsio 93240 515353 0 0 3 0x14280 nfsidl nfsio 23939 497627 0 0 3 0x14280 nfsidl nfsio 74802 300425 0 0 3 0x14280 nfsidl nfsio 46677 47435 0 0 3 0x14280 nfsidl nfsio 75539 117387 0 0 3 0x14200 bored sosplice 51875 473725 44721 0 3 0x82 thrsleep syz-fuzzer 51875 21865 44721 0 2 0x4000482 syz-fuzzer 51875 30564 44721 0 3 0x4000082 thrsleep syz-fuzzer 51875 387268 44721 0 3 0x4000082 thrsleep syz-fuzzer 51875 377791 44721 0 3 0x4000082 thrsleep syz-fuzzer 51875 177429 44721 0 3 0x4000082 kqread syz-fuzzer 51875 235366 44721 0 2 0x4000482 syz-fuzzer 51875 373255 44721 0 3 0x4000082 thrsleep syz-fuzzer 51875 488974 44721 0 3 0x4000082 thrsleep syz-fuzzer 44721 76033 4301 0 3 0x10008a sigsusp ksh 4301 268715 19366 0 3 0x9a kqread sshd 19366 305999 1 0 3 0x88 kqread sshd 29896 232824 93777 74 3 0x1100092 bpf pflogd 93777 113988 1 0 3 0x80 netio pflogd 8175 311834 71697 73 3 0x1100090 kqread syslogd 71697 208133 1 0 3 0x100082 netio syslogd 97471 370673 1 0 3 0x100080 kqread resolvd 56218 61867 0 0 3 0x14200 bored smr 56354 439411 0 0 2 0x14200 zerothread 52951 446525 0 0 3 0x14200 aiodoned aiodoned 56284 92126 0 0 3 0x14200 syncer update 25404 103119 0 0 3 0x14200 cleaner cleaner 32350 189769 0 0 3 0x14200 reaper reaper 27083 406936 0 0 3 0x14200 pgdaemon pagedaemon 31710 36960 0 0 3 0x14200 bored viomb 18549 319294 0 0 3 0x40014200 acpi0 acpi0 35414 404481 0 0 7 0x40014200 idle1 81430 215419 0 0 3 0x14200 bored softnet 53970 257569 0 0 3 0x14200 bored systqmp 97462 241339 0 0 3 0x14200 bored systq 38642 504394 0 0 2 0x40014200 softclock 8856 187333 0 0 3 0x40014200 idle0 1 436114 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 3161 (syz-executor.7) thread 0xffff80002e393ce8 (508810) exclusive rwlock clonelk r = 0 (0xffffffff828ef0a0) #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 (0xffffffff82ad3b18) #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 42073 (syz-executor.1) thread 0xffff80002af3bce0 (293125) exclusive rrwlock inode r = 0 (0xfffffd807d71b4d8) #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:1850 #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 (0xfffffd80672a2700) #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:1850 #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 10218 6511K 8092K 78643K 81039 0 pcb 13 26K 30K 78643K 8893 0 rtable 192 15K 28K 78643K 13413 0 ifaddr 92 25K 31K 78643K 3889 0 sysctl 3 1K 1K 78643K 5 0 counters 56 35K 36K 78643K 880 0 ioctlops 0 0K 4K 78643K 14538 0 iov 0 0K 28K 78643K 4896 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1651 103K 104K 78643K 34988 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 13K 78643K 344 0 VM map 2 1K 1K 78643K 2 0 sem 12 16K 32K 78643K 20 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 17 61K 89K 78643K 46261 0 sigio 0 0K 0K 78643K 1620 0 proc 67 63K 124K 78643K 4808 0 subproc 104 6K 6K 78643K 1503 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 2195 0 in_multi 70 4K 7K 78643K 2658 0 ether_multi 1 0K 0K 78643K 433 0 mrt 1 0K 0K 78643K 398 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 7808 0 pfkey data 0 0K 1K 78643K 75 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 643 1052K 1069K 78643K 564579 0 UVM aobj 131 8K 8K 78643K 149 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 1860 0 NDP 14 0K 2K 78643K 730 0 temp 169 4763K 8859K 78643K 409152 0 kqueue 6 10K 30K 78643K 1970 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 2577 0 2576 31 30 1 3 0 8 0 rtentry 112 3262 0 3183 6 2 4 5 0 8 0 unpcb 136 24827 0 24817 241 240 1 9 0 8 0 syncache 296 29 0 29 9 9 0 1 0 8 0 tcpqe 32 6 0 6 3 3 0 1 0 8 0 tcpcb 736 33095 0 33085 651 649 2 21 0 8 1 arp 120 337 0 322 1 0 1 1 0 8 0 inpcb 304 123506 0 123434 677 671 6 25 0 8 0 rttmr 72 43 0 43 15 15 0 1 0 8 0 nd6 48 447 0 428 1 0 1 1 0 8 0 pkpcb 40 425 0 425 22 22 0 1 0 8 0 kcovpl 48 114 0 106 1 0 1 1 0 8 0 ppxss 1248 134 0 134 38 38 0 1 0 8 0 pfstscr 40 243 0 243 19 19 0 1 0 8 0 pffrag 232 153 0 152 16 15 1 1 0 482 0 pffrnode 88 153 0 152 16 15 1 1 0 8 0 pffrent 40 1187 0 1186 17 16 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 1679 0 1679 13 13 0 2 0 8 0 pftag 88 13 0 7 1 0 1 1 0 8 0 pfqueue 264 7 0 7 2 2 0 1 0 8 0 pfstitem 24 47 0 45 1 0 1 1 0 8 0 pfstkey 112 329 0 327 1 0 1 1 0 8 0 pfstate 320 195 0 193 2 1 1 2 0 8 0 pfsrctr 152 29 0 29 2 2 0 1 0 8 0 pfrule 1360 1561 0 1553 26 25 1 7 0 8 0 art_heap8 4096 2 0 1 2 1 1 2 0 8 0 art_heap4 256 9621 0 9258 168 144 24 135 0 8 0 art_table 32 9623 0 9259 18 12 6 18 0 8 0 art_node 16 2515 0 2446 1 0 1 1 0 8 0 sysvmsgpl 40 43 0 3 1 0 1 1 0 8 0 semupl 112 7 0 7 2 2 0 1 0 8 0 semapl 112 12 0 2 1 0 1 1 0 8 0 shmpl 112 146 0 18 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 58693 0 57139 98 0 98 98 0 8 0 ffsino 272 58693 0 57139 104 0 104 104 0 8 0 nchpl 144 114890 0 114360 63 39 24 63 0 8 0 uvmvnodes 80 11155 0 0 228 0 228 228 0 8 0 vnodes 224 11155 0 0 657 0 657 657 0 8 0 namei 1024 402237 0 402237 20 19 1 2 0 8 1 percpumem 16 452 0 412 1 0 1 1 0 8 0 vcpupl 2048 434 0 0 55 0 55 55 0 8 0 vmpool 560 512 0 78 33 2 31 32 0 8 0 pfiaddrpl 120 612 0 612 6 6 0 1 0 8 0 scsiplug 72 20 0 20 7 7 0 1 0 8 0 scxspl 216 361300 0 361300 24 23 1 8 0 8 1 plimitpl 152 4287 0 4273 1 0 1 1 0 8 0 sigapl 424 46407 0 46345 11 3 8 8 0 8 0 futexpl 64 504310 0 504304 15 14 1 1 0 8 0 knotepl 120 1491 0 0 17 7 10 11 0 8 0 kqueuepl 216 8862 0 8857 169 166 3 8 0 8 2 pipepl 336 10929 0 10900 282 279 3 13 0 8 0 fdescpl 496 46336 0 46309 6 1 5 5 0 8 0 filepl 152 369786 0 369492 505 493 12 24 0 8 0 lockfpl 104 10709 0 10708 19 18 1 2 0 8 0 lockfspl 48 3073 0 3072 1 0 1 1 0 8 0 sessionpl 144 132 0 116 1 0 1 1 0 8 0 pgrppl 48 293 0 277 1 0 1 1 0 8 0 ucredpl 96 29402 0 29386 1 0 1 1 0 8 0 zombiepl 144 46345 0 46345 2 1 1 1 0 8 1 processpl 1064 46407 0 46345 5 0 5 5 0 8 0 procpl 672 115539 0 115460 40 32 8 9 0 8 0 srpgc 96 135 0 135 37 37 0 1 0 8 0 sosppl 168 260 0 260 48 48 0 1 0 8 0 sockpl 480 151707 0 151624 2288 2277 11 43 0 8 0 mcl64k 65536 16 0 0 2 0 2 2 0 8 0 mcl16k 16384 7 0 0 1 0 1 1 0 8 0 mcl12k 12288 10 0 0 1 0 1 1 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 16 0 0 2 0 2 2 0 8 0 mcl4k 4096 9 0 0 2 0 2 2 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 907 0 0 65 8 57 64 0 8 0 mtagpl 96 1810 0 0 21 3 18 21 0 8 2 mbufpl 256 13742 0 0 752 0 752 752 0 8 0 bufpl 288 69080 0 57923 798 0 798 798 0 8 0 anonpl 24 12701199 0 12680181 717 569 148 207 0 186 0 amapchunkpl 152 1392239 0 1391370 366 329 37 66 0 158 0 amappl16 200 114720 0 113827 264 213 51 74 0 8 0 amappl15 192 8875 0 8868 1 0 1 1 0 8 0 amappl14 184 4865 0 4851 1 0 1 1 0 8 0 amappl13 176 3847 0 3846 1 0 1 1 0 8 0 amappl12 168 10410 0 10402 1 0 1 1 0 8 0 amappl11 160 3693 0 3683 1 0 1 1 0 8 0 amappl10 152 3868 0 3857 1 0 1 1 0 8 0 amappl9 144 6470 0 6469 1 0 1 1 0 8 0 amappl8 136 11988 0 11786 9 1 8 8 0 8 0 amappl7 128 9178 0 9164 1 0 1 1 0 8 0 amappl6 120 6540 0 6504 5 3 2 2 0 8 0 amappl5 112 36504 0 36486 1 0 1 1 0 8 0 amappl4 104 13905 0 13867 9 7 2 2 0 8 0 amappl3 96 13779 0 13768 1 0 1 1 0 8 0 amappl2 88 14148 0 14099 3 1 2 3 0 8 0 amappl1 80 813801 0 813242 28 14 14 19 0 8 0 amappl 88 561499 0 561155 10 1 9 9 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 72 148 0 18 3 0 3 3 0 8 0 uaddrrnd 24 46848 0 46387 3 0 3 3 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 46848 0 46387 3 0 3 3 0 8 0 vmmpekpl 168 297928 0 297816 7 1 6 6 0 8 0 vmmpepl 168 4148569 0 4142891 921 652 269 294 0 357 6 vmsppl 368 46847 0 46387 45 2 43 43 0 8 0 rwobjpl 56 965883 0 952556 231 42 189 193 0 8 1 pdppl 4096 93703 0 93208 2005 1508 497 503 0 8 2 pvpl 32 21568957 0 21545672 1178 958 220 330 0 265 1 pmappl 248 46847 0 46387 33 3 30 30 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 5084 0 2637 71 0 71 71 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(ffffffff8257abd3) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825eecca,ffffffff8263a0f6,131,ffffffff82604eda) at __assert+0x25 sys/kern/subr_prf.c:161 tun_clone_destroy(ffff800000e0a800) at tun_clone_destroy+0x278 sys/net/if_tun.c:305 if_clone_destroy(ffff80002c96a000) at if_clone_destroy+0x132 sys/net/if.c:1218 soo_ioctl(fffffd8058406608,80206979,ffff80002c96a000,ffff80002e393ce8) at soo_ioctl+0x26c sys_ioctl(ffff80002e393ce8,ffff80002c96a118,ffff80002c96a170) at sys_ioctl+0x4a2 syscall(ffff80002c96a1e0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002c96a1e0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdc931d94a90, 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