witness: lock order reversal: 1st 0xffff8000012dfe68 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806e9b34e8 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff830bd238 -> 0xffffffff8306e212 is missing lock order [2] inode (&ip->i_lock) -> [3] sbufrcv (&so->so_rcv.sb_lock) #0 rw_enter+0x122 #1 sblock+0xb7 sys/kern/uipc_socket2.c:549 #2 soreceive+0x295 sys/kern/uipc_socket.c:945 #3 fifo_read+0x11a sys/miscfs/fifofs/fifo_vnops.c:264 #4 VOP_READ+0x102 sys/kern/vfs_vops.c:227 #5 vn_rdwr+0x15b #6 vndsetcred+0xa1 sys/dev/vnd.c:684 #7 vndioctl+0xe6c sys/dev/vnd.c:485 #8 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #9 vn_ioctl+0xf6 sys/kern/vfs_vnops.c:525 #10 sys_ioctl+0x67c #11 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #11 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #12 Xsyscall+0x128 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] sbufsnd (&so->so_snd.sb_lock) #0 rw_enter+0x122 #1 sblock+0xb7 sys/kern/uipc_socket2.c:549 #2 sosplice+0x3f4 sys/kern/uipc_socket.c:1454 #3 sys_setsockopt+0x2ba sys/kern/uipc_syscalls.c:1228 #4 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #4 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #5 Xsyscall+0x128 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{0}> 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+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd806e9b34e8,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806e9b34d8,1) at rw_enter+0x122 rrw_enter(fffffd806e9b34d8,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd805e3bbe58,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805e3bbe58,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vget(fffffd805e3bbe58,2001) at vget+0x2bd sys/kern/vfs_subr.c:678 ktrwriteraw(ffff80002a0c0038,fffffd805e3bbe58,fffffd807f7d3680,ffff800033f8a090,ffff800033f8a070) at ktrwriteraw+0x172 sys/kern/kern_ktrace.c:679 ktrnamei(ffff80002a0c0038,ffff800029fe6c00) at ktrnamei+0x13a sys/kern/kern_ktrace.c:217 namei(ffff800033f8a1c8) at namei+0x2a2 sys/kern/vfs_lookup.c:170 unp_connect(ffff8000012dfcc0,fffffd807cb60c00,ffff80002a0c0038) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff8000012dfcc0,fffffd805fae6e00,fffffd807cb60c00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff8000012dfcc0,fffffd807cb60c00,ffff800033f8a458,0,0,0) at sosend+0xa40 sendit(ffff80002a0c0038,4,ffff800033f8a5d0,0,ffff800033f8a690) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff80002a0c0038,ffff800033f8a740,ffff800033f8a690) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff800033f8a740) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800033f8a740) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd5de80ed5b0, count: -17 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800033f89cc0 rbx 0xfffffd80042c69c0 rdx 0 rcx 0xffff80002a0c0038 rax 0xffffffff834f2ff0 cpu_info_full_primary+0x1ff0 r8 0xffff800033f89ba0 r9 0x8080808080808080 r10 0x76e8e9918bc66759 r11 0x519c706af86fed42 r12 0 r13 0xfffffd8003adee00 r14 0x3 r15 0xffffffff rip 0xffffffff81ac00e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800033f89cb0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=379684 pid=82557 tcnt=4 stat=onproc flags process=0 proc=4000001 runpri=83, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a0c1c10,0xffff80002a0c1998 process=0xffff8000ffff16c8 user=0xffff800033f85000, vmspace=0xfffffd806bf0b020 estcpu=33, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 33132 45359 59051 0 2 0 syz-executor 33132 304715 59051 0 3 0x4000080 fsleep syz-executor 39067 490346 83382 0 2 0 syz-executor 39067 323593 83382 0 3 0x4000080 piperd syz-executor 68154 464568 36552 0 2 0x82000 syz-executor 68154 52908 36552 0 4 0x4082000 syz-executor 68154 378075 36552 0 3 0x4002000 suspend syz-executor 53588 387400 63202 0 2 0 syz-executor 53588 328246 63202 0 3 0x4000080 fsleep syz-executor 53588 106244 63202 0 3 0x4000080 fsleep syz-executor 28172 19186 39997 0 2 0 syz-executor 28172 138958 39997 0 3 0x4000080 fsleep syz-executor 51559 481456 12315 0 2 0 syz-executor 51559 126930 12315 0 3 0x4000080 fsleep syz-executor 82557 41488 26374 0 2 0 syz-executor 82557 159299 26374 0 3 0x4000080 fsleep syz-executor 82557 220366 26374 0 2 0x4000000 syz-executor *82557 379684 26374 0 7 0x4000001 syz-executor 86448 178958 42732 0 3 0x80 nanoslp syz-executor 86448 140263 42732 0 3 0x4000080 kqsel syz-executor 86448 471534 42732 0 3 0x4000080 fsleep syz-executor 27219 193984 1 0 3 0x100083 ttyin getty 12315 256250 5266 0 3 0x82 nanoslp syz-executor 26374 133243 5266 0 3 0x82 nanoslp syz-executor 36552 110946 5266 0 3 0x82 nanoslp syz-executor 29501 487091 0 0 3 0x14200 bored sosplice 42732 501360 5266 0 3 0x82 nanoslp syz-executor 39997 258199 5266 0 3 0x82 nanoslp syz-executor 63202 450654 5266 0 3 0x82 nanoslp syz-executor 59051 102680 5266 0 3 0x82 nanoslp syz-executor 83382 266599 5266 0 3 0x82 nanoslp syz-executor 5266 82189 68410 0 3 0x82 kqread syz-executor 68410 324799 68811 0 3 0x10008a sigsusp ksh 68811 478968 78997 0 3 0x98 kqread sshd-session 78997 308197 79746 0 3 0x92 kqread sshd-session 79746 157666 1 0 3 0x88 kqread sshd 29059 28140 36713 74 3 0x1100092 bpf pflogd 36713 130967 1 0 3 0x80 sbwait pflogd 73005 21595 3077 73 3 0x1100090 kqread syslogd 3077 144955 1 0 3 0x100082 sbwait syslogd 23206 516488 1 0 3 0x100080 kqread resolvd 40956 320357 97174 77 3 0x100092 kqread dhcpleased 32066 458536 97174 77 3 0x100092 kqread dhcpleased 97174 424125 1 0 3 0x80 kqread dhcpleased 16925 498872 0 0 3 0x14200 bored smr 3902 23376 0 0 2 0x14200 zerothread 932 210872 0 0 3 0x14200 aiodoned aiodoned 92614 38924 0 0 3 0x14200 syncer update 51548 486415 0 0 3 0x14200 cleaner cleaner 18163 336323 0 0 3 0x14200 reaper reaper 17611 96721 0 0 3 0x14200 pgdaemon pagedaemon 87254 301948 0 0 3 0x14200 bored viomb 28358 192559 0 0 3 0x40014200 acpi0 acpi0 68001 360005 0 0 7 0x40014200 idle1 70322 307908 0 0 3 0x14200 bored softnet3 69165 81530 0 0 3 0x14200 bored softnet2 77603 421658 0 0 3 0x14200 bored softnet1 83421 52766 0 0 3 0x14200 bored softnet0 45287 305217 0 0 3 0x14200 bored systqmp 75626 521813 0 0 3 0x14200 bored systq 18345 510507 0 0 3 0x14200 tmoslp softclockmp 93029 326165 0 0 3 0x40014200 tmoslp softclock 89945 291883 0 0 3 0x40014200 idle0 1 349540 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 82557 (syz-executor) thread 0xffff80002a0c0038 (379684) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff835a0b68) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 unp_connect+0x26c sys/kern/uipc_usrreq.c:868 #2 uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 #3 sosend+0xa40 #4 sendit+0x721 sys/kern/uipc_syscalls.c:786 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 #6 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #6 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 exclusive rwlock sbufsnd r = 0 (0xffff8000012dfe68) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 sblock+0xb7 sys/kern/uipc_socket2.c:549 #3 sosend+0x2ff sys/kern/uipc_socket.c:681 #4 sendit+0x721 sys/kern/uipc_syscalls.c:786 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 #6 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #6 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10223 11336K 11722K 166960K 16782 0 pcb 19 17K 19K 166960K 891 0 rtable 179 6K 7K 166960K 715 0 pf 40 18K 20K 166960K 142 0 ifaddr 39 6K 8K 166960K 119 0 ifgroup 62 2K 2K 166960K 170 0 sysctl 4 1K 1K 166960K 9 0 counters 66 36K 37K 166960K 130 0 ioctlops 0 0K 4K 166960K 1752 0 iov 1 1K 16K 166960K 249 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1480 93K 94K 166960K 4123 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 10K 18K 166960K 47 0 VM map 2 1K 1K 166960K 2 0 sem 24 11K 21K 166960K 166 0 dirhash 12 2K 3K 166960K 93 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 97K 166960K 2873 0 sigio 1 0K 0K 166960K 50 0 proc 73 91K 152K 166960K 892 0 subproc 104 6K 6K 166960K 158 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 575 0 in_multi 75 5K 7K 166960K 294 0 ether_multi 1 0K 0K 166960K 19 0 mrt 2 0K 0K 166960K 11 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 850 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 6 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 264 74K 92K 166960K 27613 0 UVM aobj 81 6K 6K 166960K 81 0 pinsyscall 43 86K 104K 166960K 4146 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 237 0 NDP 13 0K 1K 166960K 79 0 temp 78 6828K 7074K 166960K 139221 0 kqueue 14 22K 31K 166960K 438 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 120 272 0 269 4 3 1 3 0 8 0 rtentry 112 228 0 150 4 0 4 4 0 8 0 unpcb 144 2629 0 2605 16 14 2 6 0 8 1 syncache 336 13 0 13 5 5 0 1 0 8 0 tcpqe 32 7 0 7 3 3 0 1 0 8 0 tcpcb 808 1217 0 1212 26 24 2 8 0 8 0 arp 120 41 0 27 1 0 1 1 0 8 0 inpcb 336 4108 0 4091 42 39 3 15 0 8 0 ip6q 72 1 0 1 1 1 0 1 0 8 0 ip6af 40 2 0 2 1 1 0 1 0 8 0 nd6 136 47 0 26 1 0 1 1 0 8 0 pkpcb 40 24 0 24 7 6 1 1 0 8 1 kcovpl 48 12 0 4 1 0 1 1 0 8 0 ppxss 1168 15 0 15 5 5 0 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 13 0 8 1 0 1 1 0 482 0 pffrnode 88 13 0 8 1 0 1 1 0 8 0 pffrent 40 23 0 18 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 pftag 88 3 0 1 1 0 1 1 0 8 0 pfstitem 24 54 0 49 1 0 1 1 0 8 0 pfstkey 128 58 0 53 2 0 2 2 0 8 0 pfstate 376 55 0 51 5 2 3 5 0 8 0 pfrule 1344 60 0 53 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1090 0 719 34 10 24 31 0 8 0 art_table 32 1091 0 719 4 0 4 4 0 8 0 art_node 16 225 0 158 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 5 1 0 1 1 0 8 0 semapl 112 149 0 127 1 0 1 1 0 8 0 shmpl 112 78 0 0 3 0 3 3 0 8 0 dirhash 1024 73 0 56 3 0 3 3 0 8 0 dino2pl 256 6495 0 4999 95 0 95 95 0 8 0 ffsino 272 6495 0 4999 102 0 102 102 0 8 0 nchpl 144 10375 0 8674 64 0 64 64 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 39013 0 39012 5 4 1 2 0 8 0 percpumem 16 79 0 32 1 0 1 1 0 8 0 kstatmem 264 90 0 64 3 1 2 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 10 0 10 5 5 0 1 0 8 0 scxspl 216 30569 0 30569 13 12 1 8 1 8 1 plimitpl 152 602 0 584 1 0 1 1 0 8 0 sigapl 424 3211 0 3160 9 2 7 9 0 8 0 futexpl 64 41604 0 41597 1 0 1 1 0 8 0 knotepl 120 785 0 0 23 1 22 22 0 8 0 kqueuepl 216 869 0 857 13 12 1 5 0 8 0 pipepl 320 479 0 451 14 11 3 8 0 8 0 fdescpl 496 3170 0 3138 6 1 5 6 0 8 0 filepl 152 23770 0 23508 35 23 12 20 0 8 0 lockfpl 104 972 0 969 1 0 1 1 0 8 0 lockfspl 48 371 0 368 1 0 1 1 0 8 0 sessionpl 144 38 0 29 1 0 1 1 0 8 0 pgrppl 48 76 0 59 1 0 1 1 0 8 0 ucredpl 104 4381 0 4368 1 0 1 1 0 8 0 zombiepl 144 3195 0 3195 3 2 1 1 0 8 1 processpl 1160 3211 0 3160 7 3 4 6 0 8 0 procpl 648 7184 0 7120 8 2 6 8 0 8 0 srpgc 96 14 0 14 3 3 0 1 0 8 0 sosppl 168 19 0 19 4 3 1 1 0 8 1 sockpl 664 7076 0 7034 54 48 6 21 0 8 0 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 148 0 0 19 0 19 19 0 8 0 mcl2k 2048 48 0 0 6 0 6 6 0 8 0 mtagpl 96 192 0 0 5 0 5 5 0 8 0 mbufpl 256 3419 0 0 209 0 209 209 0 8 0 bufpl 280 9709 0 3535 442 0 442 442 0 8 0 anonpl 24 429016 0 419894 94 14 80 81 0 185 1 amapchunkpl 152 90993 0 90307 59 30 29 34 0 158 2 amappl16 200 10502 0 10233 59 32 27 27 0 8 1 amappl15 192 75 0 75 1 1 0 1 0 8 0 amappl14 184 145 0 132 1 0 1 1 0 8 0 amappl13 176 43 0 41 1 0 1 1 0 8 0 amappl12 168 3906 0 3874 4 1 3 3 0 8 0 amappl11 160 55 0 41 1 0 1 1 0 8 0 amappl10 152 12 0 12 3 3 0 1 0 8 0 amappl9 144 158 0 158 1 1 0 1 0 8 0 amappl8 136 22 0 18 1 0 1 1 0 8 0 amappl7 128 150 0 138 1 0 1 1 0 8 0 amappl6 120 210 0 208 1 0 1 1 0 8 0 amappl5 112 179 0 167 1 0 1 1 0 8 0 amappl4 104 390 0 371 1 0 1 1 0 8 0 amappl3 96 17107 0 16995 3 0 3 3 0 8 0 amappl2 88 3567 0 3479 3 0 3 3 0 8 0 amappl1 80 18380 0 17813 16 3 13 15 0 8 0 amappl 88 26936 0 26734 5 0 5 5 0 92 0 dma65536 65536 2 0 2 2 2 0 1 0 8 0 dma32768 32768 1 0 1 1 1 0 1 0 8 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 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 256 0 256 3 3 0 1 0 8 0 dma64 64 7 0 7 2 1 1 1 0 8 1 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 54 0 53 1 0 1 1 0 8 0 aobjpl 72 80 0 0 2 0 2 2 0 8 0 uaddrrnd 24 3170 0 3138 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3170 0 3138 1 0 1 1 0 8 0 vmmpekpl 168 22755 0 22697 4 1 3 4 0 8 0 vmmpepl 168 197133 0 194931 117 11 106 106 0 357 1 vmsppl 448 3169 0 3138 6 2 4 5 0 8 0 rwobjpl 56 56295 0 49077 109 4 105 105 0 8 3 pdppl 4096 6347 0 6276 151 80 71 87 0 8 0 pvpl 32 20761 0 0 169 2 167 167 0 265 0 pmappl 248 3169 0 3138 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 719 0 175 17 0 17 17 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd806e9b34e8,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806e9b34d8,1) at rw_enter+0x122 rrw_enter(fffffd806e9b34d8,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd805e3bbe58,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805e3bbe58,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vget(fffffd805e3bbe58,2001) at vget+0x2bd sys/kern/vfs_subr.c:678 ktrwriteraw(ffff80002a0c0038,fffffd805e3bbe58,fffffd807f7d3680,ffff800033f8a090,ffff800033f8a070) at ktrwriteraw+0x172 sys/kern/kern_ktrace.c:679 ktrnamei(ffff80002a0c0038,ffff800029fe6c00) at ktrnamei+0x13a sys/kern/kern_ktrace.c:217 namei(ffff800033f8a1c8) at namei+0x2a2 sys/kern/vfs_lookup.c:170 unp_connect(ffff8000012dfcc0,fffffd807cb60c00,ffff80002a0c0038) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff8000012dfcc0,fffffd805fae6e00,fffffd807cb60c00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff8000012dfcc0,fffffd807cb60c00,ffff800033f8a458,0,0,0) at sosend+0xa40 sendit(ffff80002a0c0038,4,ffff800033f8a5d0,0,ffff800033f8a690) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff80002a0c0038,ffff800033f8a740,ffff800033f8a690) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff800033f8a740) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800033f8a740) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd5de80ed5b0, count: -17 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1218 sched_idle(ffff800029b7bff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -5