witness: lock order reversal: 1st 0xffff800000e2c710 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806e906d68 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff8292c146 -> 0xffffffff828d64a9 is missing lock order [2] inode (&ip->i_lock) -> [3] sbufrcv (&so->so_rcv.sb_lock) #0 rw_enter+0xd1 #1 sblock+0x8a sys/kern/uipc_socket2.c:548 #2 soreceive+0x201 sys/kern/uipc_socket.c:876 #3 fifo_read+0xd2 sys/miscfs/fifofs/fifo_vnops.c:256 #4 VOP_READ+0xc3 sys/kern/vfs_vops.c:227 #5 vn_rdwr+0x10a #6 vndsetcred+0x86 sys/dev/vnd.c:684 #7 vndioctl+0xac1 sys/dev/vnd.c:485 #8 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:264 #9 vn_ioctl+0xc0 sys/kern/vfs_vnops.c:525 #10 sys_ioctl+0x4a9 #11 syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] #11 syscall+0x8cf 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+0xd1 #1 sblock+0x8a sys/kern/uipc_socket2.c:548 #2 sosplice+0x2a7 sys/kern/uipc_socket.c:1385 #3 sys_setsockopt+0x1d7 sys/kern/uipc_syscalls.c:1231 #4 syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] #4 syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 #5 Xsyscall+0x128 Stopped at db_enter+0x1c: 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+0x1c sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd806e906d68,9,0) at witness_checkorder+0xc05 rw_enter(fffffd806e906d58,1) at rw_enter+0xd1 rrw_enter(fffffd806e906d58,1) at rrw_enter+0x91 sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd805fd68da0,2001) at VOP_LOCK+0x8b sys/kern/vfs_vops.c:524 vn_lock(fffffd805fd68da0,2001) at vn_lock+0x85 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff80002daff7c8) at vfs_lookup+0xd3 sys/kern/vfs_lookup.c:418 namei(ffff80002daff7c8) at namei+0x56a sys/kern/vfs_lookup.c:250 unp_connect(ffff800000e2c568,fffffd806d35f800,ffff8000ffffcce0) at unp_connect+0x1ce sys/kern/uipc_usrreq.c:864 uipc_dgram_send(ffff800000e2c568,fffffd806d298300,fffffd806d35f800,0) at uipc_dgram_send+0xd7 sys/kern/uipc_usrreq.c:599 sosend(ffff800000e2c568,fffffd806d35f800,ffff80002daffa58,0,0,0) at sosend+0x7aa sendit(ffff8000ffffcce0,6,ffff80002daffbd0,0,ffff80002daffc90) at sendit+0x54c sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff8000ffffcce0,ffff80002daffd40,ffff80002daffc90) at sys_sendmsg+0x19b sys/kern/uipc_syscalls.c:604 syscall(ffff80002daffd40) at syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] syscall(ffff80002daffd40) at syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x55e51e07000, count: -15 ddb{0}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff80002daff420 rbx 0xffffffff828e9404 pp_r600_decoded_lanes+0x2e88d rdx 0xffff800000de1cc0 rcx 0xffff8000ffffcce0 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff80002daff300 r9 0x8080808080808080 r10 0x7ed54668d70b409a r11 0xf8b9dbea6619584f r12 0xfffffd8003b26020 r13 0xfffffd800333ddc0 r14 0x3 r15 0xffffffff rip 0xffffffff81cae62c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002daff410 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.7) tid=202541 pid=28262 tcnt=2 stat=onproc flags process=8000000 proc=4000000 runpri=32, usrpri=82, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002b6b7c60,0xffffffff82ea1428 process=0xffff80002a29f140 user=0xffff80002dafa000, vmspace=0xfffffd8066b6e388 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 28262 108348 18471 0 2 0x8000000 syz-executor.7 *28262 202541 18471 0 7 0xc000000 syz-executor.7 68601 44325 93549 0 3 0x8000002 clonelk ifconfig 93549 319395 39395 0 3 0x810008a sigsusp sh 71004 81580 37628 0 7 0x8000000 syz-executor.6 71004 321090 37628 0 3 0xc000000 clonelk syz-executor.6 39395 136168 44555 0 3 0x8000082 wait syz-executor.5 53796 245101 44555 0 3 0x8000002 clonelk syz-executor.0 80461 180415 55623 0 3 0x8000080 nanoslp syz-executor.2 80461 59476 55623 0 3 0xc000080 sbwait syz-executor.2 80461 503851 55623 0 3 0xc000080 fsleep syz-executor.2 37955 481337 94200 0 3 0x8000080 nanoslp syz-executor.4 37955 111327 94200 0 3 0xc000080 kqsel syz-executor.4 37955 435148 94200 0 3 0xc000080 msgwait syz-executor.4 37955 20846 94200 0 3 0xc000080 fsleep syz-executor.4 61295 278160 46166 0 3 0x8003000 suspend syz-executor.1 61295 46244 46166 0 3 0xc081000 clonelk syz-executor.1 88182 238686 0 0 3 0x14200 bored sosplice 94200 403315 44555 0 3 0x8000082 nanoslp syz-executor.4 46166 75949 44555 0 3 0x8000082 nanoslp syz-executor.1 55623 178827 44555 0 3 0x8000082 nanoslp syz-executor.2 37628 317036 44555 0 3 0x8000082 nanoslp syz-executor.6 18471 294252 44555 0 3 0x8000082 nanoslp syz-executor.7 44555 311012 42122 0 3 0x1a000082 thrsleep syz-fuzzer 44555 139102 42122 0 3 0x1e000082 thrsleep syz-fuzzer 44555 518843 42122 0 3 0x1e000082 wait syz-fuzzer 44555 468762 42122 0 3 0x1e000082 wait syz-fuzzer 44555 424812 42122 0 3 0x1e000082 thrsleep syz-fuzzer 44555 171324 42122 0 3 0x1e000082 wait syz-fuzzer 44555 188689 42122 0 3 0x1e000082 wait syz-fuzzer 44555 214715 42122 0 3 0x1e000082 wait syz-fuzzer 44555 350629 42122 0 3 0x1e000082 wait syz-fuzzer 44555 191843 42122 0 3 0x1e000082 thrsleep syz-fuzzer 44555 150150 42122 0 3 0x1e000082 wait syz-fuzzer 44555 415572 42122 0 3 0x1e000082 thrsleep syz-fuzzer 44555 142077 42122 0 3 0x1e000082 wait syz-fuzzer 44555 220447 42122 0 3 0x1e000082 kqread syz-fuzzer 44555 91158 42122 0 3 0x1e000082 thrsleep syz-fuzzer 42122 225200 44664 0 3 0x810008a sigsusp ksh 44664 338482 35952 0 3 0x1800009a kqread sshd 51919 333684 1 0 3 0x18100083 ttyin getty 35952 386440 1 0 3 0x18000088 kqread sshd 38289 471223 57253 73 3 0x19100010 ffs_fsync syslogd 57253 513808 1 0 3 0x18100082 sbwait syslogd 35788 54327 1 0 3 0x18100080 kqread resolvd 79259 356509 51968 77 3 0x18100092 kqread dhcpleased 93059 432580 51968 77 3 0x18100092 kqread dhcpleased 51968 28235 1 0 3 0x18000080 kqread dhcpleased 76197 292096 0 0 3 0x14200 bored smr 71894 223255 0 0 3 0x14200 pgzero zerothread 14315 471448 0 0 3 0x14200 aiodoned aiodoned 6771 96217 0 0 3 0x14200 syncer update 71847 28013 0 0 3 0x14200 cleaner cleaner 57583 365132 0 0 3 0x14200 reaper reaper 74033 100130 0 0 3 0x14200 pgdaemon pagedaemon 47100 25163 0 0 3 0x14200 bored viomb 19093 488522 0 0 3 0x40014200 acpi0 acpi0 18487 520731 0 0 3 0x40014200 idle1 83809 105362 0 0 3 0x14200 bored softnet3 26595 41996 0 0 3 0x14200 bored softnet2 73865 16927 0 0 3 0x14200 bored softnet1 74363 17074 0 0 3 0x14200 bored softnet0 78632 224915 0 0 3 0x14200 bored systqmp 3911 63741 0 0 3 0x14200 bored systq 5982 190754 0 0 3 0x14200 tmoslp softclockmp 44731 432027 0 0 3 0x40014200 tmoslp softclock 90854 469917 0 0 3 0x40014200 idle0 1 216810 0 0 3 0x8000082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 28262 (syz-executor.7) thread 0xffff8000ffffcce0 (202541) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82dea520) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1157 #1 unp_connect+0x1c6 sys/kern/uipc_usrreq.c:864 #2 uipc_dgram_send+0xd7 sys/kern/uipc_usrreq.c:599 #3 sosend+0x7aa #4 sendit+0x54c sys/kern/uipc_syscalls.c:786 #5 sys_sendmsg+0x19b sys/kern/uipc_syscalls.c:604 #6 syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] #6 syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 exclusive rwlock sbufsnd r = 0 (0xffff800000e2c710) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1157 #1 rw_enter+0x32d sys/kern/kern_rwlock.c:309 #2 sblock+0x8a sys/kern/uipc_socket2.c:548 #3 sosend+0x259 sys/kern/uipc_socket.c:610 #4 sendit+0x54c sys/kern/uipc_syscalls.c:786 #5 sys_sendmsg+0x19b sys/kern/uipc_syscalls.c:604 #6 syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] #6 syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 38289 (syslogd) thread 0xffff8000ffffd490 (471223) exclusive rrwlock inode r = 0 (0xfffffd806e7381b0) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1157 #1 rw_enter+0x32d sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x91 sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:524 #4 vn_lock+0x85 sys/kern/vfs_vnops.c:564 #5 sys_fsync+0xf1 sys/kern/vfs_syscalls.c:2931 #6 syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] #6 syscall+0x854 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10193 6540K 6872K 166960K 11880 0 pcb 17 12K 12K 166960K 72 0 rtable 166 6K 7K 166960K 425 0 pf 31 9K 10K 166960K 61 0 ifaddr 33 12K 15K 166960K 61 0 ifgroup 52 2K 2K 166960K 85 0 counters 64 36K 36K 166960K 82 0 ioctlops 0 0K 4K 166960K 1493 0 iov 0 0K 16K 166960K 20 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1366 86K 86K 166960K 1655 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 15 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 21 0 dirhash 12 2K 3K 166960K 39 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 17 61K 77K 166960K 427 0 sigio 0 0K 0K 166960K 4 0 proc 65 91K 103K 166960K 552 0 subproc 104 6K 6K 166960K 143 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 36 0 in_multi 56 4K 7K 166960K 125 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 436 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 278 77K 96K 166960K 6216 0 UVM aobj 14 2K 2K 166960K 16 0 pinsyscall 37 74K 100K 166960K 1635 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 15 0 NDP 11 0K 2K 166960K 39 0 temp 56 6803K 6871K 166960K 20492 0 kqueue 13 20K 24K 166960K 74 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 59 0 55 1 0 1 1 0 8 0 rtentry 112 129 0 56 4 0 4 4 0 8 0 unpcb 144 269 0 249 2 1 1 2 0 8 0 syncache 336 5 0 5 2 2 0 1 0 8 0 tcpqe 32 19 0 19 1 1 0 1 0 8 0 tcpcb 808 102 0 97 2 1 1 2 0 8 0 arp 120 20 0 8 1 0 1 1 0 8 0 inpcb 384 413 0 401 5 3 2 3 0 8 0 nd6 136 33 0 19 1 0 1 1 0 8 0 pkpcb 40 3 0 3 2 1 1 1 0 8 1 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1168 3 0 2 3 2 1 1 0 8 0 pffrag 232 3 0 1 2 1 1 1 0 482 0 pffrnode 88 3 0 1 2 1 1 1 0 8 0 pffrent 40 4 0 2 2 1 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 48 0 21 1 0 1 1 0 8 0 pfstkey 128 48 0 21 2 0 2 2 0 8 0 pfstate 376 48 0 21 4 0 4 4 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 513 0 228 29 3 26 29 0 8 4 art_table 32 514 0 228 4 0 4 4 0 8 0 art_node 16 128 0 62 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 3 2 1 1 1 0 8 0 semapl 112 19 0 9 1 0 1 1 0 8 0 shmpl 112 13 0 2 1 0 1 1 0 8 0 dirhash 1024 36 0 19 3 0 3 3 0 8 0 dino2pl 256 2094 0 576 96 0 96 96 0 8 0 ffsino 272 2094 0 576 103 0 103 103 0 8 0 nchpl 144 2825 0 1082 67 0 67 67 0 8 0 uvmvnodes 80 2416 0 0 50 0 50 50 0 8 0 vnodes 216 2416 0 0 135 0 135 135 0 8 0 namei 1024 9738 0 9737 2 1 1 2 0 8 0 percpumem 16 55 0 9 1 0 1 1 0 8 0 kstatmem 264 40 0 18 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 13131 0 13130 10 9 1 8 1 8 0 plimitpl 152 90 0 74 1 0 1 1 0 8 0 sigapl 424 740 0 693 7 1 6 6 0 8 0 futexpl 64 5452 0 5450 2 1 1 1 0 8 0 knotepl 120 379 0 0 11 0 11 11 0 8 0 kqueuepl 216 117 0 104 2 0 2 2 0 8 1 pipepl 320 183 0 156 3 0 3 3 0 8 0 fdescpl 496 718 0 690 5 1 4 5 0 8 0 filepl 152 3833 0 3577 13 2 11 11 0 8 0 lockfpl 104 125 0 121 1 0 1 1 0 8 0 lockfspl 48 61 0 57 1 0 1 1 0 8 0 sessionpl 144 26 0 10 1 0 1 1 0 8 0 pgrppl 48 33 0 17 1 0 1 1 0 8 0 ucredpl 104 399 0 389 1 0 1 1 0 8 0 zombiepl 144 695 0 693 1 0 1 1 0 8 0 processpl 1144 740 0 693 4 0 4 4 0 8 0 procpl 656 1095 0 1026 9 2 7 7 0 8 0 srpgc 96 4 0 4 1 0 1 1 0 8 1 sockpl 664 749 0 713 9 5 4 5 0 8 0 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 7 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 337 0 0 43 0 43 43 0 8 0 mtagpl 96 16 0 0 1 0 1 1 0 8 0 mbufpl 256 370 0 0 23 0 23 23 0 8 0 bufpl 280 7621 0 1243 456 0 456 456 0 8 0 anonpl 24 263341 0 257270 94 8 86 90 0 186 39 amapchunkpl 152 21111 0 20454 41 2 39 40 0 158 9 amappl16 200 7068 0 6940 32 18 14 32 0 8 6 amappl15 192 15 0 15 1 1 0 1 0 8 0 amappl14 184 195 0 183 2 1 1 2 0 8 0 amappl13 176 16 0 16 1 1 0 1 0 8 0 amappl12 168 1398 0 1369 2 0 2 2 0 8 0 amappl11 160 70 0 52 1 0 1 1 0 8 0 amappl10 152 69 0 67 1 0 1 1 0 8 0 amappl9 144 298 0 298 2 2 0 1 0 8 0 amappl8 136 139 0 104 2 0 2 2 0 8 0 amappl7 128 52 0 43 1 0 1 1 0 8 0 amappl6 120 345 0 330 2 1 1 2 0 8 0 amappl5 112 200 0 186 1 0 1 1 0 8 0 amappl4 104 562 0 528 2 0 2 2 0 8 0 amappl3 96 3998 0 3919 3 0 3 3 0 8 0 amappl2 88 1138 0 1064 3 1 2 3 0 8 0 amappl1 80 10720 0 10227 23 11 12 22 0 8 0 amappl 88 5634 0 5442 6 0 6 6 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 15 0 2 1 0 1 1 0 8 0 uaddrrnd 24 718 0 690 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 718 0 690 1 0 1 1 0 8 0 vmmpekpl 168 9943 0 9878 4 0 4 4 0 8 0 vmmpepl 168 66998 0 65164 118 18 100 113 0 357 13 vmsppl 440 717 0 690 4 0 4 4 0 8 0 rwobjpl 56 26603 0 23090 56 6 50 52 0 8 0 pdppl 4096 1443 0 1380 105 38 67 71 0 8 4 pvpl 32 45398 0 0 368 1 367 367 0 265 0 pmappl 248 717 0 690 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 419 0 49 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd806e906d68,9,0) at witness_checkorder+0xc05 rw_enter(fffffd806e906d58,1) at rw_enter+0xd1 rrw_enter(fffffd806e906d58,1) at rrw_enter+0x91 sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd805fd68da0,2001) at VOP_LOCK+0x8b sys/kern/vfs_vops.c:524 vn_lock(fffffd805fd68da0,2001) at vn_lock+0x85 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff80002daff7c8) at vfs_lookup+0xd3 sys/kern/vfs_lookup.c:418 namei(ffff80002daff7c8) at namei+0x56a sys/kern/vfs_lookup.c:250 unp_connect(ffff800000e2c568,fffffd806d35f800,ffff8000ffffcce0) at unp_connect+0x1ce sys/kern/uipc_usrreq.c:864 uipc_dgram_send(ffff800000e2c568,fffffd806d298300,fffffd806d35f800,0) at uipc_dgram_send+0xd7 sys/kern/uipc_usrreq.c:599 sosend(ffff800000e2c568,fffffd806d35f800,ffff80002daffa58,0,0,0) at sosend+0x7aa sendit(ffff8000ffffcce0,6,ffff80002daffbd0,0,ffff80002daffc90) at sendit+0x54c sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff8000ffffcce0,ffff80002daffd40,ffff80002daffc90) at sys_sendmsg+0x19b sys/kern/uipc_syscalls.c:604 syscall(ffff80002daffd40) at syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] syscall(ffff80002daffd40) at syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x55e51e07000, count: -15 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029cebff0) at x86_ipi_db+0x1e 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+0x27 __mp_lock(ffffffff82dea318) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82dea318) at __mp_lock+0x129 sys/kern/kern_lock.c:147 syscall(ffff8000323553a0) at syscall+0x83b mi_syscall sys/sys/syscall_mi.h:180 [inline] syscall(ffff8000323553a0) at syscall+0x83b sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7823b6d50560, count: -6