witness: lock order reversal: 1st 0xffff8000015a2658 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffffd806e007528 inode (&ip->i_lock) lock order [1] sbufrcv (&so->so_rcv.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff834385bd -> 0xffffffff833a5512 is missing lock order [2] inode (&ip->i_lock) -> [1] 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 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(fffffd806e007528,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806e007510,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806e007510,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd805db1f438,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805db1f438,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd805db1f438,fffffd8065b3c1c0,0,0,200,0,405b6f81c4d599cf) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd805db1f438,fffffd8065b3c1c0,ffff80002a35fc50) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd806cae3e00,33,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff8000015a2578,ffff80002a48be48,ffff80002a48bdf8,0,ffff80002a48be38,ffff80002a48bfbc,357987fd37e0f2ee) at soreceive+0xc73 sys/kern/uipc_socket.c:1021 recvit(ffff80002a35fc50,46,ffff80002a48bf90,0,ffff80002a48c040) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff80002a35fc50,ffff80002a48c0f0,ffff80002a48c040) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff80002a48c0f0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a48c0f0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x293e60dfab0, count: -14 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a48b8d0 rbx 0xfffffd800470d928 rdx 0 rcx 0xffff80002a35fc50 rax 0xffffffff8383aff0 cpu_info_full_primary+0x1ff0 r8 0xffff80002a48b7b0 r9 0x8080808080808080 r10 0x410a1368a8004ac3 r11 0x17e50c41cb54a7f3 r12 0 r13 0xfffffd8003f24f00 r14 0x3 r15 0xffffffff rip 0xffffffff810240e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a48b8c0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=304609 pid=90474 tcnt=3 stat=onproc flags process=1000000 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000388bc548,0xffff80002a35f4b0 process=0xffff8000ffff4de8 user=0xffff80002a487000, vmspace=0xfffffd806bebfac8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 90474 136394 58225 0 2 0x1000000 syz-executor *90474 304609 58225 0 7 0x5000000 syz-executor 90474 11901 58225 0 3 0x5000080 fsleep syz-executor 25445 387388 28556 0 2 0 syz-executor 25445 76060 28556 0 3 0x4000000 biowait syz-executor 25445 237015 28556 0 3 0x4000000 fltagain2 syz-executor 22441 474027 41102 0 2 0 syz-executor 22441 86105 41102 0 3 0x4000080 pipewr syz-executor 86779 309483 73466 0 2 0 syz-executor 86779 37524 73466 0 3 0x4000080 kqsel syz-executor 21021 276445 80637 0 2 0 syz-executor 21021 455242 80637 0 3 0x4000080 fsleep syz-executor 21021 365938 80637 0 3 0x4000080 fsleep syz-executor 21021 418112 80637 0 3 0x4000080 fsleep syz-executor 81557 156510 77362 0 3 0x80 nanoslp syz-executor 81557 25041 77362 0 3 0x4000080 kqsel syz-executor 81557 91892 77362 0 3 0x4000080 fsleep syz-executor 33157 469339 89851 0 3 0x80 nanoslp syz-executor 33157 180941 89851 0 3 0x4000080 sbwait syz-executor 33157 390215 89851 0 3 0x4000080 fsleep syz-executor 58601 422856 1 0 3 0x100083 ttyin getty 73466 414040 99928 0 3 0x82 nanoslp syz-executor 89851 409047 99928 0 3 0x82 nanoslp syz-executor 35671 450910 0 0 3 0x14200 bored sosplice 77362 192050 99928 0 3 0x82 nanoslp syz-executor 82823 79376 99928 0 3 0x82 wait syz-executor 80637 335459 99928 0 3 0x82 nanoslp syz-executor 28556 486369 99928 0 3 0x82 nanoslp syz-executor 41102 5388 99928 0 3 0x82 nanoslp syz-executor 58225 221479 99928 0 3 0x82 nanoslp syz-executor 99928 308109 34102 0 2 0x2 syz-executor 34102 11163 87662 0 3 0x10008a sigsusp ksh 87662 150866 70848 0 3 0x98 kqread sshd-session 70848 473173 7331 0 3 0x92 kqread sshd-session 7331 181548 1 0 3 0x88 kqread sshd 5638 368787 98961 74 3 0x1100092 bpf pflogd 98961 79791 1 0 3 0x80 sbwait pflogd 24278 31199 89966 73 3 0x1100090 kqread syslogd 89966 57600 1 0 3 0x100082 sbwait syslogd 98655 503546 1 0 3 0x100080 kqread resolvd 65088 2038 98587 77 3 0x100092 kqread dhcpleased 62690 244486 98587 77 3 0x100092 kqread dhcpleased 98587 320027 1 0 3 0x80 kqread dhcpleased 92411 402115 0 0 3 0x14200 bored smr 10053 243605 0 0 2 0x14200 zerothread 98526 338864 0 0 3 0x14200 aiodoned aiodoned 16302 84597 0 0 3 0x14200 syncer update 88547 60033 0 0 3 0x14200 cleaner cleaner 77714 300896 0 0 3 0x14200 reaper reaper 6803 411747 0 0 3 0x14200 pgdaemon pagedaemon 87978 200151 0 0 3 0x14200 bored viomb 96021 272803 0 0 3 0x40014200 acpi0 acpi0 13978 325302 0 0 7 0x40014200 idle1 80292 81763 0 0 3 0x14200 bored softnet3 12445 163451 0 0 3 0x14200 bored softnet2 75461 243225 0 0 3 0x14200 bored softnet1 38278 321803 0 0 3 0x14200 bored softnet0 84284 141841 0 0 3 0x14200 bored systqmp 27874 332470 0 0 3 0x14200 bored systq 57796 28700 0 0 3 0x14200 tmoslp softclockmp 84029 440184 0 0 3 0x40014200 tmoslp softclock 77861 103001 0 0 3 0x40014200 idle0 1 223704 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 90474 (syz-executor) thread 0xffff80002a35fc50 (304609) 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 unp_externalize+0x14e #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 exclusive rwlock sbufrcv r = 0 (0xffff8000015a2658) #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 sblock+0xb7 sys/kern/uipc_socket2.c:536 #3 soreceive+0x28e sys/kern/uipc_socket.c:882 #4 recvit+0x40a sys/kern/uipc_syscalls.c:1072 #5 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 #6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 25445 (syz-executor) thread 0xffff8000388bccf8 (76060) exclusive rrwlock inode r = 0 (0xfffffd80785d1aa0) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x190 sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x23c sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10241 11183K 11676K 166960K 18679 0 pcb 18 18K 20K 166960K 599 0 rtable 163 10K 11K 166960K 697 0 pf 32 17K 26K 166960K 257 0 ifaddr 33 6K 8K 166960K 168 0 ifgroup 47 2K 2K 166960K 311 0 sysctl 4 1K 1K 166960K 6 0 counters 60 35K 37K 166960K 332 0 ioctlops 0 0K 4K 166960K 1880 0 iov 1 2K 20K 166960K 173 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1387 87K 88K 166960K 4360 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 13K 166960K 56 0 VM map 2 1K 1K 166960K 2 0 sem 19 21K 21K 166960K 357 0 dirhash 12 2K 3K 166960K 90 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 248K 166960K 3679 0 sigio 0 0K 0K 166960K 164 0 proc 73 91K 140K 166960K 973 0 subproc 72 4K 4K 166960K 93 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 357 0 in_multi 63 4K 7K 166960K 213 0 ether_multi 1 0K 0K 166960K 21 0 mrt 2 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 223 996K 996K 166960K 223 0 exec 0 0K 1K 166960K 1210 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 69 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 260 75K 93K 166960K 34411 0 UVM aobj 10 2K 2K 166960K 11 0 pinsyscall 43 86K 101K 166960K 4827 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 236 0 NDP 11 0K 2K 166960K 123 0 temp 82 8648K 8894K 166960K 175254 0 kqueue 15 24K 30K 166960K 564 0 SYN cache 2 10K 18K 166960K 3 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 120 410 0 407 5 4 1 3 0 8 0 rtentry 112 209 0 147 4 0 4 4 0 8 0 unpcb 144 2621 0 2598 21 20 1 6 0 8 0 syncache 336 12 0 12 2 2 0 1 0 8 0 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 808 1358 0 1284 48 40 8 11 0 8 0 arp 120 34 0 21 1 0 1 1 0 8 0 inpcb 376 3652 0 3569 50 41 9 18 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 38 0 25 1 0 1 1 0 8 0 pkpcb 40 57 0 57 7 6 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 mppekey 1024 6 0 6 3 3 0 1 0 8 0 ppxss 1168 103 0 103 4 3 1 1 0 8 1 pppxif 1472 14 0 14 4 3 1 1 0 8 1 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 34 0 27 1 0 1 1 0 482 0 pffrnode 88 33 0 26 1 0 1 1 0 8 0 pffrent 40 66 0 59 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 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pfstitem 24 181 0 86 1 0 1 1 0 8 0 pfstkey 128 183 0 88 4 0 4 4 0 8 0 pfstate 376 181 0 87 10 0 10 10 0 8 0 pfrule 1344 25 0 18 2 1 1 2 0 8 0 rttmr 136 4 0 4 1 1 0 1 0 8 0 art_heap8 4096 5 0 1 5 1 4 5 0 8 0 art_heap4 256 935 0 615 34 7 27 30 0 8 4 art_table 32 940 0 616 4 0 4 4 0 8 0 art_node 16 198 0 148 1 0 1 1 0 8 0 sysvmsgpl 40 27 0 19 1 0 1 1 0 8 0 semapl 112 351 0 334 1 0 1 1 0 8 0 shmpl 112 8 0 1 1 0 1 1 0 8 0 dirhash 1024 69 0 52 3 0 3 3 0 8 0 dino2pl 256 7468 0 5961 95 0 95 95 0 8 0 ffsino 280 7468 0 5961 109 0 109 109 0 8 0 nchpl 144 12466 0 10778 64 0 64 64 0 8 0 rtmask 32 23 0 23 9 8 1 1 0 8 1 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 45036 0 45036 5 4 1 2 0 8 1 percpumem 16 180 0 136 1 0 1 1 0 8 0 kstatmem 264 192 0 172 2 0 2 2 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 10 0 10 5 4 1 1 0 8 1 scxspl 216 38373 0 38372 15 14 1 8 1 8 0 plimitpl 152 584 0 565 1 0 1 1 0 8 0 sigapl 424 3981 0 3930 10 3 7 9 0 8 0 futexpl 64 52215 0 52209 1 0 1 1 0 8 0 knotepl 120 1136 0 0 32 0 32 32 0 8 0 kqueuepl 216 1384 0 1370 20 19 1 5 0 8 0 pipepl 328 505 0 477 9 6 3 9 0 8 0 fdescpl 504 3938 0 3906 5 0 5 5 0 8 0 filepl 152 26203 0 25903 36 23 13 17 0 8 1 lockfpl 104 1209 0 1206 2 1 1 2 0 8 0 lockfspl 48 419 0 416 1 0 1 1 0 8 0 sessionpl 144 33 0 24 1 0 1 1 0 8 0 pgrppl 48 116 0 99 1 0 1 1 0 8 0 ucredpl 104 4907 0 4894 1 0 1 1 0 8 0 zombiepl 144 4135 0 4134 3 2 1 1 0 8 0 processpl 1176 3981 0 3930 6 0 6 6 0 8 0 procpl 656 9046 0 8982 8 1 7 8 0 8 1 srpgc 96 10 0 10 5 4 1 1 0 8 1 sosppl 168 13 0 13 4 4 0 1 0 8 0 sockpl 688 6879 0 6772 69 59 10 19 0 8 0 mcl64k 65536 12 0 0 2 0 2 2 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 4 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 11 0 0 2 0 2 2 0 8 0 mcl4k 4096 126 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 83 0 0 11 0 11 11 0 8 0 mtagpl 96 391 0 0 10 0 10 10 0 8 0 mbufpl 256 622 0 0 36 1 35 36 0 8 0 bufpl 280 10902 0 4748 440 0 440 440 0 8 0 anonpl 24 435454 0 419777 130 24 106 109 0 184 0 amapchunkpl 152 113932 0 113102 72 39 33 40 0 158 1 amappl16 200 9034 0 8502 62 22 40 41 0 8 0 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 128 0 116 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 4615 0 4583 3 1 2 2 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 3 0 3 1 1 0 1 0 8 0 amappl9 144 272 0 272 1 1 0 1 0 8 0 amappl8 136 38 0 35 1 0 1 1 0 8 0 amappl7 128 123 0 110 1 0 1 1 0 8 0 amappl6 120 202 0 198 1 0 1 1 0 8 0 amappl5 112 128 0 118 1 0 1 1 0 8 0 amappl4 104 421 0 401 1 0 1 1 0 8 0 amappl3 96 24248 0 24113 4 0 4 4 0 8 0 amappl2 88 762 0 695 2 0 2 2 0 8 0 amappl1 80 20516 0 19938 16 1 15 16 0 8 0 amappl 88 33774 0 33571 5 0 5 5 0 92 0 dma65536 65536 4 0 4 2 2 0 1 0 8 0 dma8192 8192 2 0 2 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 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 7 0 7 2 2 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 10 0 1 1 0 1 1 0 8 0 uaddrrnd 24 3938 0 3906 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3938 0 3906 1 0 1 1 0 8 0 vmmpekpl 168 29294 0 29243 3 0 3 3 0 8 0 vmmpepl 168 237173 0 234693 147 29 118 130 0 357 0 vmsppl 456 3937 0 3906 5 0 5 5 0 8 0 rwobjpl 64 61285 0 53859 126 2 124 126 0 8 0 pdppl 4096 7883 0 7812 119 48 71 83 0 8 0 pvpl 32 26884 0 0 216 0 216 216 0 265 0 pmappl 248 3937 0 3906 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 398 0 115 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(fffffd806e007528,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806e007510,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806e007510,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd805db1f438,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805db1f438,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd805db1f438,fffffd8065b3c1c0,0,0,200,0,405b6f81c4d599cf) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd805db1f438,fffffd8065b3c1c0,ffff80002a35fc50) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd806cae3e00,33,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff8000015a2578,ffff80002a48be48,ffff80002a48bdf8,0,ffff80002a48be38,ffff80002a48bfbc,357987fd37e0f2ee) at soreceive+0xc73 sys/kern/uipc_socket.c:1021 recvit(ffff80002a35fc50,46,ffff80002a48bf90,0,ffff80002a48c040) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff80002a35fc50,ffff80002a48c0f0,ffff80002a48c040) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff80002a48c0f0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a48c0f0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x293e60dfab0, 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