witness: lock order reversal: 1st 0xffff8000015366e0 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffffd806e875a50 inode (&ip->i_lock) lock order [1] sbufrcv (&so->so_rcv.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff8333eb82 -> 0xffffffff833873c0 is missing lock order [2] inode (&ip->i_lock) -> [1] sbufrcv (&so->so_rcv.sb_lock) #0 rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 #1 sblock+0xb6 sys/kern/uipc_socket2.c:536 #2 soreceive+0x27d sys/kern/uipc_socket.c:890 #3 fifo_read+0x117 sys/miscfs/fifofs/fifo_vnops.c:264 #4 VOP_READ+0x101 sys/kern/vfs_vops.c:227 #5 vn_rdwr+0x15b sys/kern/vfs_vnops.c:-1 #6 vndsetcred+0xa1 sys/dev/vnd.c:685 #7 vndioctl+0xdfc sys/dev/vnd.c:486 #8 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #9 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #10 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #11 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #12 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(fffffd806e875a50,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806e875a38,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806e875a38,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd805dcd47c0,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd805dcd47c0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd805dcd47c0,fffffd805dcd47c0,0,0,200,0,6d5b1e297b85ad6f) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd805dcd47c0,fffffd805dcd47c0,ffff8000ffff3240) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd807eb03300,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090 soreceive(ffff8000015365f0,ffff80002a353778,ffff80002a353728,0,ffff80002a353760,ffff80002a3538ec,17e74d9e30d65687) at soreceive+0xc24 sys/kern/uipc_socket.c:1029 recvit(ffff8000ffff3240,4,ffff80002a3538c0,0,ffff80002a353970) at recvit+0x40b sys/kern/uipc_syscalls.c:1078 sys_recvmsg(ffff8000ffff3240,ffff80002a353a20,ffff80002a353970) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 syscall(ffff80002a353a20) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a353a20) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf56bfeb4f20, count: -14 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a353200 rbx 0 rdx 0 rcx 0xffff8000ffff3240 rax 0xffffffff838a8ff0 cpu_info_full_primary+0x1ff0 r8 0xffff80002a3530e0 r9 0x8080808080808080 r10 0x29b3a9f18f6bd94e r11 0x3bb92016552710a4 r12 0xfffffd8003f59880 r13 0xfffffd8004741df0 r14 0x3 r15 0xffffffff83421e46 substchar+0xccdf rip 0xffffffff81428175 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a3531f0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=509330 pid=55986 tcnt=2 stat=onproc flags process=1000000 proc=4000000 runpri=32, usrpri=74, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff2018,0xffffffff839edbe8 process=0xffff80003c440028 user=0xffff80002a34e000, vmspace=0xfffffd806c9633e8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 55986 340993 18329 0 2 0x1000000 syz-executor *55986 509330 18329 0 7 0x5000000 syz-executor 38263 226102 85216 0 3 0x80 nanoslp syz-executor 38263 134689 85216 0 3 0x4000080 fsleep syz-executor 54120 469778 25250 0 2 0 syz-executor 54120 12028 25250 0 3 0x4000000 biowait syz-executor 2 100623 90373 0 2 0 syz-executor 2 376919 90373 0 3 0x4000080 fsleep syz-executor 2 293846 90373 0 3 0x4000080 fsleep syz-executor 2 517923 90373 0 3 0x4000080 fsleep syz-executor 2 382609 90373 0 3 0x4000080 fsleep syz-executor 3781 10378 79027 0 3 0x80 nanoslp syz-executor 3781 289450 79027 0 3 0x4000080 fsleep syz-executor 3781 314210 79027 0 2 0x4000000 syz-executor 3781 350268 79027 0 3 0x4000080 fsleep syz-executor 21940 479175 96877 0 3 0x82 nanoslp syz-executor 79027 475688 96877 0 3 0x82 nanoslp syz-executor 90373 311802 96877 0 3 0x82 nanoslp syz-executor 18329 272260 96877 0 3 0x82 nanoslp syz-executor 48811 409432 96877 0 3 0x82 nanoslp syz-executor 25250 137314 96877 0 3 0x82 nanoslp syz-executor 85216 401952 96877 0 3 0x82 nanoslp syz-executor 23156 246203 96877 0 3 0x82 nanoslp syz-executor 96877 22078 17361 0 3 0x82 kqread syz-executor 17361 290281 89863 0 3 0x10008a sigsusp ksh 89863 284612 97205 0 3 0x98 kqread sshd-session 97205 204839 14348 0 3 0x92 kqread sshd-session 82743 244712 1 0 3 0x100083 ttyopn getty 14348 292137 1 0 3 0x88 kqread sshd 5482 390841 99629 74 3 0x1100092 bpf pflogd 99629 117912 1 0 3 0x80 sbwait pflogd 82532 72713 56675 73 3 0x1100090 kqread syslogd 56675 206445 1 0 3 0x100082 sbwait syslogd 36395 234577 1 0 3 0x100080 kqread resolvd 70255 54820 81779 77 3 0x100092 kqread dhcpleased 83305 280169 81779 77 3 0x100092 kqread dhcpleased 81779 127827 1 0 3 0x80 kqread dhcpleased 45998 318503 0 0 3 0x14200 bored smr 55257 213360 0 0 2 0x14200 zerothread 25880 342228 0 0 3 0x14200 aiodoned aiodoned 21874 133300 0 0 3 0x14200 syncer update 3774 155779 0 0 3 0x14200 cleaner cleaner 3366 244896 0 0 3 0x14200 reaper reaper 44960 521096 0 0 3 0x14200 pgdaemon pagedaemon 76283 504577 0 0 3 0x14200 bored viomb 41027 412715 0 0 3 0x40014200 acpi0 acpi0 17739 424302 0 0 7 0x40014200 idle1 49375 509582 0 0 3 0x14200 bored softnet1 71303 305415 0 0 3 0x14200 bored softnet0 11550 46773 0 0 3 0x14200 bored systqmp 33009 189478 0 0 3 0x14200 bored systq 54954 480786 0 0 3 0x14200 tmoslp softclockmp 92590 289818 0 0 3 0x40014200 tmoslp softclock 63171 322209 0 0 3 0x40014200 idle0 1 482330 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 55986 (syz-executor) thread 0xffff8000ffff3240 (509330) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83952040) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 unp_externalize+0x155 sys/kern/uipc_usrreq.c:-1 #2 soreceive+0xc24 sys/kern/uipc_socket.c:1029 #3 recvit+0x40b sys/kern/uipc_syscalls.c:1078 #4 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #6 Xsyscall+0x128 exclusive rwlock sbufrcv r = 0 (0xffff8000015366e0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 sblock+0xb6 sys/kern/uipc_socket2.c:536 #3 soreceive+0x27d sys/kern/uipc_socket.c:890 #4 recvit+0x40b sys/kern/uipc_syscalls.c:1078 #5 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #7 Xsyscall+0x128 Process 54120 (syz-executor) thread 0xffff8000fffe8558 (12028) exclusive rrwlock inode r = 0 (0xfffffd806e875360) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11071 12160K 12380K 166960K 13503 0 pcb 21 15K 17K 166960K 314 0 rtable 182 9K 10K 166960K 719 0 pf 28 16K 19K 166960K 147 0 ifaddr 30 5K 8K 166960K 130 0 ifgroup 43 2K 2K 166960K 208 0 sysctl 4 1K 9K 166960K 10 0 counters 64 36K 38K 166960K 220 0 ioctlops 0 0K 4K 166960K 1831 0 iov 0 0K 32K 166960K 100 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1390 87K 88K 166960K 2428 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 10K 166960K 29 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 66 0 dirhash 12 2K 2K 166960K 48 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 1549 0 sigio 0 0K 0K 166960K 22 0 proc 73 115K 180K 166960K 821 0 subproc 72 4K 4K 166960K 135 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 183 0 in_multi 62 4K 7K 166960K 220 0 ether_multi 1 0K 0K 166960K 12 0 mrt 1 0K 0K 166960K 15 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 663 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 4 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 258 168K 182K 166960K 15591 0 UVM aobj 23 15K 17K 166960K 28 0 pinsyscall 43 86K 100K 166960K 2840 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 138 0 NDP 9 0K 2K 166960K 92 0 temp 77 8683K 8751K 166960K 65314 0 kqueue 14 22K 30K 166960K 330 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 141 0 137 1 0 1 1 0 8 0 rtentry 176 226 0 159 6 0 6 6 0 8 0 unpcb 144 981 0 957 13 10 3 4 0 8 2 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpqe 32 18 0 18 2 2 0 1 0 8 0 tcpcb 736 391 0 386 9 8 1 7 0 8 0 arp 136 37 0 25 1 0 1 1 0 8 0 inpcb 328 1565 0 1553 15 13 2 7 0 8 1 nd6 152 49 0 34 1 0 1 1 0 8 0 pkpcb 40 8 0 8 3 2 1 1 0 8 1 kcovpl 48 15 0 7 1 0 1 1 0 8 0 ppxss 1192 54 0 54 4 3 1 1 0 8 1 pppxif 1504 8 0 8 4 3 1 1 0 8 1 pffrag 232 14 0 2 1 0 1 1 0 482 0 pffrnode 88 13 0 2 1 0 1 1 0 8 0 pffrent 40 20 0 8 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 pfstlim 224 1 0 1 1 1 0 1 0 8 0 pfqueue 320 1 0 1 1 1 0 1 0 8 0 rttmr 136 2 0 2 2 2 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 928 0 643 31 7 24 29 0 8 4 art_table 40 932 0 643 5 0 5 5 0 8 0 art_node 32 222 0 163 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 11 2 1 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 64 0 54 1 0 1 1 0 8 0 shmpl 112 16 0 2 1 0 1 1 0 8 0 dirhash 1024 41 0 24 3 0 3 3 0 8 0 dino2pl 256 4249 0 2738 96 0 96 96 0 8 0 ffsino 296 4249 0 2738 118 0 118 118 0 8 0 nchpl 144 6353 0 4632 65 0 65 65 0 8 0 rtmask 32 10 0 10 3 3 0 1 0 8 0 vnodes 216 4786 0 0 266 0 266 266 0 8 0 namei 1024 21723 0 21723 4 3 1 2 0 8 1 percpumem 16 125 0 78 1 0 1 1 0 8 0 vcpupl 3968 8 0 2 1 0 1 1 0 8 0 vmpool 848 9 0 3 1 0 1 1 0 8 0 kstatmem 264 124 0 104 3 1 2 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 9 0 9 5 4 1 1 0 8 1 scxspl 216 38704 0 38703 13 11 2 8 1 8 1 plimitpl 152 406 0 389 1 0 1 1 0 8 0 sigapl 424 1846 0 1798 9 2 7 8 0 8 0 knotepl 120 662 0 0 19 0 19 19 0 8 0 kqueuepl 224 644 0 634 11 8 3 5 0 8 2 pipepl 344 242 0 215 3 0 3 3 0 8 0 fdescpl 528 1808 0 1776 3 0 3 3 0 8 0 filepl 160 10675 0 10440 19 6 13 15 0 8 0 lockfpl 104 421 0 419 1 0 1 1 0 8 0 lockfspl 48 186 0 184 1 0 1 1 0 8 0 sessionpl 144 30 0 21 1 0 1 1 0 8 0 pgrppl 48 65 0 48 1 0 1 1 0 8 0 ucredpl 104 1732 0 1719 1 0 1 1 0 8 0 zombiepl 144 1900 0 1897 3 2 1 1 0 8 0 processpl 1232 1846 0 1798 6 0 6 6 0 8 0 procpl 664 4108 0 4050 8 2 6 7 0 8 0 sosppl 176 7 0 7 2 2 0 1 0 8 0 sockpl 752 2733 0 2692 39 29 10 12 0 8 5 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 32 0 0 4 0 4 4 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 1178 0 0 73 0 73 73 0 8 0 bufpl 280 14966 0 8830 439 0 439 439 0 8 0 anonpl 32 12192 0 0 99 0 99 99 0 246 0 amapchunkpl 152 52407 0 51880 54 24 30 38 0 158 3 amappl16 200 5335 0 5298 36 24 12 27 0 8 3 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 21 0 21 3 3 0 1 0 8 0 amappl13 176 506 0 505 1 0 1 1 0 8 0 amappl12 168 2214 0 2171 3 0 3 3 0 8 0 amappl11 160 41 0 41 1 1 0 1 0 8 0 amappl10 152 48 0 33 1 0 1 1 0 8 0 amappl9 144 258 0 257 1 0 1 1 0 8 0 amappl8 136 44 0 42 1 0 1 1 0 8 0 amappl7 128 114 0 113 1 0 1 1 0 8 0 amappl6 120 364 0 351 1 0 1 1 0 8 0 amappl5 112 84 0 73 1 0 1 1 0 8 0 amappl4 104 454 0 425 1 0 1 1 0 8 0 amappl3 96 9205 0 9105 4 1 3 3 0 8 0 amappl2 88 1904 0 1822 2 0 2 2 0 8 0 amappl1 80 15423 0 14835 14 0 14 14 0 8 0 amappl 88 14546 0 14367 5 0 5 5 0 92 0 uvmvnodes 80 157 0 0 4 0 4 4 0 8 0 dma8192 8192 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 dma256 256 19 0 19 3 3 0 1 0 8 0 dma128 128 256 0 256 4 4 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 27 0 5 1 0 1 1 0 8 0 uaddrrnd 24 1808 0 1776 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1808 0 1776 1 0 1 1 0 8 0 vmmpekpl 168 14749 0 14701 4 1 3 3 0 8 0 vmmpepl 168 118542 0 116555 120 24 96 108 0 357 2 vmsppl 488 1807 0 1776 7 2 5 5 0 8 0 rwobjpl 80 32373 0 31247 33 5 28 32 0 8 0 pdppl 4096 3641 0 3564 128 51 77 83 0 8 0 pvpl 32 19205 0 0 156 1 155 155 0 265 0 pmappl 256 1816 0 1779 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 380 0 75 9 0 9 9 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(fffffd806e875a50,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806e875a38,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806e875a38,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd805dcd47c0,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd805dcd47c0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd805dcd47c0,fffffd805dcd47c0,0,0,200,0,6d5b1e297b85ad6f) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd805dcd47c0,fffffd805dcd47c0,ffff8000ffff3240) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd807eb03300,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090 soreceive(ffff8000015365f0,ffff80002a353778,ffff80002a353728,0,ffff80002a353760,ffff80002a3538ec,17e74d9e30d65687) at soreceive+0xc24 sys/kern/uipc_socket.c:1029 recvit(ffff8000ffff3240,4,ffff80002a3538c0,0,ffff80002a353970) at recvit+0x40b sys/kern/uipc_syscalls.c:1078 sys_recvmsg(ffff8000ffff3240,ffff80002a353a20,ffff80002a353970) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 syscall(ffff80002a353a20) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a353a20) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf56bfeb4f20, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299ddff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -5