witness: lock order reversal: 1st 0xfffffd806efb7c38 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806de78630 inode (&ip->i_lock) lock order [1] fdlock (&newfdp->fd_fd.fd_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff83429102 -> 0xffffffff833a5512 is missing lock order [2] inode (&ip->i_lock) -> [3] sbufrcv (&so->so_rcv.sb_lock) #0 rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 #1 sblock+0xb7 sys/kern/uipc_socket2.c:536 #2 soreceive+0x28e sys/kern/uipc_socket.c:882 #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+0xf8 sys/kern/vfs_vnops.c:531 #10 sys_ioctl+0x5c3 #11 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #12 Xsyscall+0x128 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] fdlock (&newfdp->fd_fd.fd_lock) #0 rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 #1 unp_externalize+0x3e4 sys/kern/uipc_usrreq.c:1070 #2 soreceive+0xc73 sys/kern/uipc_socket.c:1021 #3 recvit+0x40a sys/kern/uipc_syscalls.c:1072 #4 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #6 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:438 witness_checkorder(fffffd806de78630,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806de78618,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806de78618,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd806de79b40,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806de79b40,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_closefile(fffffd80630afdb0,ffff80002a3a87e8) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80630afdb0,ffff80002a3a87e8) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615 fdrop(fffffd80630afdb0,ffff80002a3a87e8) at fdrop+0x126 sys/kern/kern_descrip.c:1265 knote_drop(fffffd806cdb8da0,ffff80002a3a87e8) at knote_drop+0x1a1 sys/kern/kern_event.c:2142 knote_remove(ffff80002a3a87e8,fffffd806ec5e948,fffffd806ec5e9d0,4,0) at knote_remove+0x239 sys/kern/kern_event.c:2025 knote_fdclose(ffff80002a3a87e8,4) at knote_fdclose+0xf9 sys/kern/kern_event.c:2049 fdrelease(ffff80002a3a87e8,4) at fdrelease+0xf9 sys/kern/kern_descrip.c:749 syscall(ffff80003c584270) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c584270) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc81da12dc80, count: -14 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c583d10 rbx 0xfffffd800470c360 rdx 0xffff80000144a880 rcx 0xffff80002a3a87e8 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c583bf0 r9 0x8080808080808080 r10 0x9ab690d3e1e47df4 r11 0x871745327dbaf2f7 r12 0 r13 0xfffffd8003f24f00 r14 0x3 r15 0xffffffff rip 0xffffffff810240e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c583d00 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=141098 pid=27117 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a3a8558,0xffffffff839eb828 process=0xffff8000fffef2b0 user=0xffff80003c57f000, vmspace=0xfffffd806eb9c560 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 27117 331137 86043 0 2 0 syz-executor *27117 141098 86043 0 7 0x4000000 syz-executor 97070 196056 37930 0 2 0 syz-executor 97070 288979 37930 0 3 0x4000080 fsleep syz-executor 86095 487484 28107 0 2 0 syz-executor 86095 210572 28107 0 3 0x4000080 fsleep syz-executor 87175 182892 60873 0 2 0 syz-executor 87175 314544 60873 0 3 0x4000080 fsleep syz-executor 9221 450984 45694 0 3 0x80 nanoslp syz-executor 9221 75080 45694 0 3 0x4000080 lockf syz-executor 9221 313474 45694 0 3 0x4000080 fsleep syz-executor 61472 522218 94523 0 2 0 syz-executor 61472 171439 94523 0 3 0x4000080 rest syz-executor 96865 39646 87722 0 3 0x80 nanoslp syz-executor 96865 522882 87722 0 3 0x4000080 fsleep syz-executor 96865 375815 87722 0 2 0x4000000 syz-executor 96865 294944 87722 0 3 0x4000080 fsleep syz-executor 94523 417935 34177 0 3 0x82 nanoslp syz-executor 84180 74987 0 0 3 0x14200 acct acct 19849 251837 0 0 3 0x14200 bored sosplice 37930 34198 34177 0 3 0x82 nanoslp syz-executor 90272 455761 0 0 3 0x14280 nfsidl nfsio 45082 34620 0 0 3 0x14280 nfsidl nfsio 45125 305972 0 0 3 0x14280 nfsidl nfsio 88620 26665 0 0 3 0x14280 nfsidl nfsio 418 170678 0 0 3 0x14280 nfsidl nfsio 78663 522129 0 0 3 0x14280 nfsidl nfsio 85823 265397 0 0 3 0x14280 nfsidl nfsio 76413 25636 0 0 3 0x14280 nfsidl nfsio 33364 71592 0 0 3 0x14280 nfsidl nfsio 37944 90687 0 0 3 0x14280 nfsidl nfsio 23207 418683 0 0 3 0x14280 nfsidl nfsio 82637 330718 0 0 3 0x14280 nfsidl nfsio 19417 145851 0 0 3 0x14280 nfsidl nfsio 21604 493484 0 0 3 0x14280 nfsidl nfsio 91762 301384 0 0 3 0x14280 nfsidl nfsio 43410 134156 0 0 3 0x14280 nfsidl nfsio 7297 362525 0 0 3 0x14280 nfsidl nfsio 68377 151794 0 0 3 0x14280 nfsidl nfsio 99571 216105 0 0 3 0x14280 nfsidl nfsio 20013 268503 0 0 3 0x14280 nfsidl nfsio 28311 174138 34177 0 3 0x82 wait syz-executor 60873 448150 34177 0 3 0x82 nanoslp syz-executor 87722 238599 34177 0 3 0x82 nanoslp syz-executor 86043 460586 34177 0 3 0x82 nanoslp syz-executor 45694 248697 34177 0 3 0x82 nanoslp syz-executor 28107 330561 34177 0 3 0x82 nanoslp syz-executor 34177 259135 68956 0 3 0x82 kqread syz-executor 68956 151336 72364 0 3 0x10008a sigsusp ksh 72364 296716 21665 0 3 0x98 kqread sshd-session 21665 288106 61372 0 3 0x92 kqread sshd-session 58362 308191 1 0 3 0x100083 ttyin getty 61372 500623 1 0 3 0x88 kqread sshd 11872 416456 24323 74 3 0x1100092 bpf pflogd 24323 340776 1 0 3 0x80 sbwait pflogd 2386 449109 81923 73 3 0x1100090 kqread syslogd 81923 474542 1 0 3 0x100082 sbwait syslogd 88986 182287 1 0 3 0x100080 kqread resolvd 51614 262853 47625 77 3 0x100092 kqread dhcpleased 26363 480692 47625 77 3 0x100092 kqread dhcpleased 47625 90431 1 0 3 0x80 kqread dhcpleased 26331 97191 0 0 3 0x14200 bored smr 99864 59430 0 0 2 0x14200 zerothread 4113 174809 0 0 3 0x14200 aiodoned aiodoned 60050 326761 0 0 3 0x14200 syncer update 70950 317734 0 0 3 0x14200 cleaner cleaner 69773 63518 0 0 3 0x14200 reaper reaper 90054 365530 0 0 3 0x14200 pgdaemon pagedaemon 19494 205047 0 0 3 0x14200 bored viomb 37668 232706 0 0 3 0x40014200 acpi0 acpi0 62521 19285 0 0 7 0x40014200 idle1 22200 261596 0 0 3 0x14200 bored softnet3 73580 95480 0 0 3 0x14200 bored softnet2 29064 145824 0 0 3 0x14200 bored softnet1 84459 352378 0 0 3 0x14200 bored softnet0 81850 427177 0 0 3 0x14200 bored systqmp 89217 477503 0 0 3 0x14200 bored systq 83013 121286 0 0 3 0x14200 tmoslp softclockmp 91673 385553 0 0 3 0x40014200 tmoslp softclock 30181 155488 0 0 3 0x40014200 idle0 1 277159 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 27117 (syz-executor) thread 0xffff80002a3a87e8 (141098) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83906af8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 vn_closefile+0x41 sys/kern/vfs_vnops.c:608 #2 fdrop+0x126 sys/kern/kern_descrip.c:1265 #3 knote_drop+0x1a1 sys/kern/kern_event.c:2142 #4 knote_remove+0x239 sys/kern/kern_event.c:2025 #5 knote_fdclose+0xf9 sys/kern/kern_event.c:2049 #6 fdrelease+0xf9 sys/kern/kern_descrip.c:749 #7 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #8 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd806efb7c38) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 sys_close+0xc4 sys/kern/kern_descrip.c:767 #3 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #4 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10199 11032K 11539K 166960K 12549 0 pcb 17 15K 16K 166960K 184 0 rtable 162 7K 9K 166960K 505 0 pf 36 18K 20K 166960K 130 0 ifaddr 33 5K 8K 166960K 98 0 ifgroup 55 2K 2K 166960K 160 0 sysctl 3 1K 1K 166960K 3 0 counters 64 36K 37K 166960K 154 0 ioctlops 0 0K 4K 166960K 1556 0 iov 0 0K 24K 166960K 79 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1427 90K 90K 166960K 2068 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 31 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 829 0 sigio 0 0K 0K 166960K 9 0 proc 72 91K 128K 166960K 677 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 89 0 in_multi 59 4K 7K 166960K 161 0 ether_multi 1 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 452 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 235 73K 91K 166960K 9179 0 UVM aobj 14 2K 2K 166960K 16 0 pinsyscall 43 86K 104K 166960K 1999 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 46 0 NDP 12 0K 2K 166960K 65 0 temp 76 8648K 8904K 166960K 29773 0 kqueue 14 22K 28K 166960K 157 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 83 0 79 1 0 1 1 0 8 0 rtentry 112 156 0 89 4 0 4 4 0 8 0 unpcb 144 948 0 929 11 6 5 6 0 8 4 syncache 336 6 0 6 2 2 0 1 0 8 0 tcpcb 808 160 0 155 3 2 1 2 0 8 0 arp 120 25 0 14 1 0 1 1 0 8 0 inpcb 376 813 0 803 11 3 8 8 0 8 7 nd6 136 33 0 20 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 1 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1168 29 0 29 2 1 1 1 0 8 1 pppxif 1472 7 0 7 3 2 1 1 0 8 1 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 6 0 2 1 0 1 1 0 482 0 pffrnode 88 6 0 2 1 0 1 1 0 8 0 pffrent 40 8 0 4 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 pfstitem 24 73 0 18 1 0 1 1 0 8 0 pfstkey 128 75 0 20 2 0 2 2 0 8 0 pfstate 376 73 0 19 6 0 6 6 0 8 0 pfrule 1344 26 0 19 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 641 0 327 30 3 27 30 0 8 4 art_table 32 642 0 327 4 0 4 4 0 8 0 art_node 16 152 0 91 1 0 1 1 0 8 0 sysvmsgpl 40 15 0 14 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 29 0 19 1 0 1 1 0 8 0 shmpl 112 13 0 2 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2917 0 1413 95 0 95 95 0 8 0 ffsino 280 2917 0 1413 109 0 109 109 0 8 0 nchpl 144 4057 0 2365 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 0 1 1 0 8 1 uvmvnodes 80 3386 0 0 70 0 70 70 0 8 0 vnodes 216 3386 0 0 189 0 189 189 0 8 0 namei 1024 13841 0 13841 2 1 1 2 0 8 1 percpumem 16 91 0 45 1 0 1 1 0 8 0 kstatmem 264 90 0 66 3 0 3 3 0 8 0 scsiplug 72 5 0 5 2 1 1 1 0 8 1 scxspl 216 12658 0 12658 9 8 1 8 1 8 1 plimitpl 152 107 0 90 1 0 1 1 0 8 0 sigapl 424 1156 0 1084 9 0 9 9 0 8 0 futexpl 64 10801 0 10795 1 0 1 1 0 8 0 knotepl 120 559 0 0 17 0 17 17 0 8 0 kqueuepl 216 246 0 236 2 1 1 2 0 8 0 pipepl 328 166 0 138 3 0 3 3 0 8 0 fdescpl 504 1116 0 1084 5 0 5 5 0 8 0 filepl 152 6822 0 6591 18 3 15 15 0 8 4 lockfpl 104 232 0 228 1 0 1 1 0 8 0 lockfspl 48 99 0 96 1 0 1 1 0 8 0 sessionpl 144 26 0 17 1 0 1 1 0 8 0 pgrppl 48 40 0 23 1 0 1 1 0 8 0 ucredpl 104 1081 0 1068 1 0 1 1 0 8 0 zombiepl 144 1085 0 1084 1 0 1 1 0 8 0 processpl 1176 1156 0 1084 6 0 6 6 0 8 0 procpl 656 2241 0 2159 8 0 8 8 0 8 0 srpgc 96 12 0 12 2 1 1 1 0 8 1 sosppl 168 7 0 7 2 1 1 1 0 8 1 sockpl 688 1850 0 1818 31 20 11 17 0 8 7 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 35 0 0 5 0 5 5 0 8 0 mtagpl 96 67 0 0 2 0 2 2 0 8 0 mbufpl 256 303 0 0 19 0 19 19 0 8 0 bufpl 280 5047 0 135 351 0 351 351 0 8 0 anonpl 24 178962 0 174341 50 3 47 47 0 184 17 amapchunkpl 152 29595 0 29008 29 0 29 29 0 158 5 amappl16 200 3711 0 3673 26 14 12 15 0 8 8 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 121 0 109 1 0 1 1 0 8 0 amappl13 176 2 0 2 1 1 0 1 0 8 0 amappl12 168 1804 0 1771 4 1 3 3 0 8 0 amappl11 160 51 0 36 1 0 1 1 0 8 0 amappl10 152 34 0 34 1 1 0 1 0 8 0 amappl9 144 248 0 248 1 1 0 1 0 8 0 amappl8 136 23 0 20 1 0 1 1 0 8 0 amappl7 128 116 0 103 1 0 1 1 0 8 0 amappl6 120 212 0 207 1 0 1 1 0 8 0 amappl5 112 135 0 126 1 0 1 1 0 8 0 amappl4 104 331 0 311 1 0 1 1 0 8 0 amappl3 96 5789 0 5666 4 0 4 4 0 8 0 amappl2 88 702 0 638 2 0 2 2 0 8 0 amappl1 80 10480 0 9902 14 0 14 14 0 8 0 amappl 88 8731 0 8551 5 0 5 5 0 92 0 dma65536 65536 1 0 1 1 0 1 1 0 8 1 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 128 254 0 254 2 2 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 15 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1116 0 1084 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1116 0 1084 1 0 1 1 0 8 0 vmmpekpl 168 10119 0 10071 3 0 3 3 0 8 0 vmmpepl 168 73625 0 71680 99 4 95 96 0 357 10 vmsppl 456 1115 0 1084 5 0 5 5 0 8 0 rwobjpl 64 25315 0 20957 71 0 71 71 0 8 0 pdppl 4096 2239 0 2168 117 46 71 85 0 8 0 pvpl 32 15508 0 0 128 3 125 125 0 265 0 pmappl 248 1115 0 1084 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 305 0 57 8 0 8 8 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:438 witness_checkorder(fffffd806de78630,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806de78618,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806de78618,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd806de79b40,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806de79b40,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_closefile(fffffd80630afdb0,ffff80002a3a87e8) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80630afdb0,ffff80002a3a87e8) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615 fdrop(fffffd80630afdb0,ffff80002a3a87e8) at fdrop+0x126 sys/kern/kern_descrip.c:1265 knote_drop(fffffd806cdb8da0,ffff80002a3a87e8) at knote_drop+0x1a1 sys/kern/kern_event.c:2142 knote_remove(ffff80002a3a87e8,fffffd806ec5e948,fffffd806ec5e9d0,4,0) at knote_remove+0x239 sys/kern/kern_event.c:2025 knote_fdclose(ffff80002a3a87e8,4) at knote_fdclose+0xf9 sys/kern/kern_event.c:2049 fdrelease(ffff80002a3a87e8,4) at fdrelease+0xf9 sys/kern/kern_descrip.c:749 syscall(ffff80003c584270) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c584270) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc81da12dc80, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029a9bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 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(ffff800029a9bff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -5