witness: lock order reversal: 1st 0xffff80000145ea40 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806ac88508 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff8312c38c -> 0xffffffff830d64b2 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:537 #2 soreceive+0x28e sys/kern/uipc_socket.c:876 #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] sbufsnd (&so->so_snd.sb_lock) #0 rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 #1 sblock+0xb7 sys/kern/uipc_socket2.c:537 #2 sosplice+0x40d sys/kern/uipc_socket.c:1358 #3 sys_setsockopt+0x2ba sys/kern/uipc_syscalls.c:1221 #4 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbc6 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(fffffd806ac88508,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806ac884f0,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806ac884f0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd80794fde60,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd80794fde60,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003c5da658) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff80003c5da658) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff80000145e880,fffffd806a15db00,ffff8000ffff3998) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff80000145e880,fffffd807b61fb00,fffffd806a15db00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff80000145e880,fffffd806a15db00,ffff80003c5da8d8,0,0,0) at sosend+0x804 sendit(ffff8000ffff3998,3,ffff80003c5daa50,0,ffff80003c5dab10) at sendit+0x721 sys/kern/uipc_syscalls.c:779 sys_sendmsg(ffff8000ffff3998,ffff80003c5dabc0,ffff80003c5dab10) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 syscall(ffff80003c5dabc0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5dabc0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xccb7c6a36d0, count: -15 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c5da2d0 rbx 0xfffffd800433b2d8 rdx 0xffff8000013e3cc0 rcx 0xffff8000ffff3998 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c5da1b0 r9 0x8080808080808080 r10 0x4bcc931cbe983765 r11 0x8116d4dfaed0ed04 r12 0 r13 0xfffffd8003b53f00 r14 0x3 r15 0xffffffff rip 0xffffffff8239cdf5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c5da2c0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=235783 pid=70395 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=0xffff8000ffff2a68,0xffff8000ffff2f88 process=0xffff800030d68250 user=0xffff80003c5d5000, vmspace=0xfffffd806bfb5ac8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 48892 242056 15217 0 2 0 syz-executor 72731 299228 82511 0 2 0 syz-executor 72731 473500 82511 0 3 0x4000080 netcon syz-executor 70395 463772 92742 0 2 0 syz-executor *70395 235783 92742 0 7 0x4000000 syz-executor 64116 186189 18992 0 3 0x80 nanoslp syz-executor 64116 106225 18992 0 3 0x4000080 fsleep syz-executor 9581 175969 33429 0 2 0x490 syz-executor 9581 151210 33429 0 3 0x4000090 kqsel syz-executor 9581 396083 33429 0 3 0x4000090 fsleep syz-executor 10985 357355 44117 60929 3 0x90 nanoslp syz-executor 10985 257167 44117 60929 3 0x4000090 kqsel syz-executor 10985 37147 44117 60929 3 0x4000090 fsleep syz-executor 10985 182224 44117 60929 3 0x4000090 fsleep syz-executor 72990 313880 0 0 3 0x14200 acct acct 79408 132570 0 0 3 0x14280 nfsidl nfsio 9614 496060 0 0 3 0x14280 nfsidl nfsio 18481 462577 0 0 3 0x14280 nfsidl nfsio 86716 4163 0 0 3 0x14280 nfsidl nfsio 66854 364525 0 0 3 0x14280 nfsidl nfsio 70931 14319 0 0 3 0x14280 nfsidl nfsio 96506 508793 0 0 3 0x14280 nfsidl nfsio 7487 142869 0 0 3 0x14280 nfsidl nfsio 76992 330356 0 0 3 0x14280 nfsidl nfsio 36517 483618 0 0 3 0x14280 nfsidl nfsio 65310 231535 0 0 3 0x14280 nfsidl nfsio 13807 450364 0 0 3 0x14280 nfsidl nfsio 9001 269587 0 0 3 0x14280 nfsidl nfsio 18085 65052 0 0 3 0x14280 nfsidl nfsio 81489 351278 0 0 3 0x14280 nfsidl nfsio 60589 211024 0 0 3 0x14280 nfsidl nfsio 16057 274951 0 0 3 0x14280 nfsidl nfsio 46827 513891 0 0 3 0x14280 nfsidl nfsio 3351 189890 0 0 3 0x14280 nfsidl nfsio 98013 469223 0 0 3 0x14280 nfsidl nfsio 82511 185209 28400 0 2 0x482 syz-executor 15217 222621 28400 0 3 0x82 nanoslp syz-executor 92742 313107 28400 0 3 0x82 nanoslp syz-executor 71262 16050 1 0 7 0x3 getty 18992 25856 28400 0 2 0x2 syz-executor 88595 183127 28400 0 2 0x82 syz-executor 33429 136074 28400 0 2 0x2 syz-executor 32597 58685 0 0 3 0x14200 bored sosplice 18105 367899 43647 0 3 0x100082 sbwait arp 43647 197947 1 0 3 0x10008a sigsusp sh 20312 225986 28400 0 2 0x482 syz-executor 44117 258207 28400 0 2 0x482 syz-executor 28400 141193 2214 0 3 0x82 kqread syz-executor 2214 445710 61918 0 3 0x10008a sigsusp ksh 61918 188627 67827 0 3 0x98 kqread sshd-session 67827 192683 43348 0 3 0x92 kqread sshd-session 43348 150943 1 0 3 0x88 kqread sshd 35211 33844 50905 74 3 0x1100092 bpf pflogd 50905 408259 1 0 3 0x80 sbwait pflogd 77071 279535 50758 73 3 0x1100090 kqread syslogd 50758 352202 1 0 3 0x100082 sbwait syslogd 68823 192671 1 0 3 0x100080 kqread resolvd 57755 153949 87244 77 3 0x100092 kqread dhcpleased 85036 488227 87244 77 3 0x100092 kqread dhcpleased 87244 252540 1 0 3 0x80 kqread dhcpleased 69719 257890 0 0 3 0x14200 bored smr 14528 439063 0 0 2 0x14200 zerothread 48575 420321 0 0 3 0x14200 aiodoned aiodoned 10658 462031 0 0 3 0x14200 syncer update 47170 204922 0 0 3 0x14200 cleaner cleaner 6309 247621 0 0 3 0x14200 reaper reaper 43857 278590 0 0 3 0x14200 pgdaemon pagedaemon 61209 268585 0 0 3 0x14200 bored viomb 31842 378422 0 0 3 0x40014200 acpi0 acpi0 35948 32358 0 0 3 0x40014200 idle1 68890 78450 0 0 3 0x14200 bored softnet3 22667 247526 0 0 3 0x14200 bored softnet2 63466 120547 0 0 3 0x14200 bored softnet1 12368 388752 0 0 3 0x14200 bored softnet0 44336 421945 0 0 3 0x14200 bored systqmp 68675 208551 0 0 3 0x14200 bored systq 15488 305388 0 0 3 0x14200 tmoslp softclockmp 88697 36351 0 0 3 0x40014200 tmoslp softclock 10703 485074 0 0 3 0x40014200 idle0 1 253266 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 70395 (syz-executor) thread 0xffff8000ffff3998 (235783) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff836710f8) #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+0x804 #4 sendit+0x721 sys/kern/uipc_syscalls.c:779 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 #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 exclusive rwlock sbufsnd r = 0 (0xffff80000145ea40) #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:537 #3 sosend+0x2e2 sys/kern/uipc_socket.c:625 #4 sendit+0x721 sys/kern/uipc_syscalls.c:779 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10252 11316K 11623K 166960K 18053 0 pcb 17 18K 20K 166960K 1293 0 rtable 216 8K 8K 166960K 1285 0 pf 39 18K 19K 166960K 208 0 ifaddr 43 8K 9K 166960K 188 0 ifgroup 66 2K 3K 166960K 290 0 sysctl 4 1K 5K 166960K 23 0 counters 68 36K 37K 166960K 200 0 ioctlops 0 0K 4K 166960K 2049 0 iov 0 0K 24K 166960K 440 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1427 90K 90K 166960K 5413 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 32K 36K 166960K 85 0 VM map 2 1K 1K 166960K 2 0 sem 27 49K 54K 166960K 65 0 dirhash 12 2K 3K 166960K 90 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 19 69K 97K 166960K 4819 0 sigio 0 0K 0K 166960K 132 0 proc 74 103K 140K 166960K 1280 0 subproc 81 5K 5K 166960K 155 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 839 0 in_multi 80 6K 6K 166960K 392 0 ether_multi 1 0K 0K 166960K 49 0 mrt 2 0K 0K 166960K 21 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 265 1182K 1182K 166960K 265 0 exec 0 0K 1K 166960K 1609 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 9 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 238 74K 93K 166960K 46599 0 UVM aobj 183 15K 17K 166960K 205 0 pinsyscall 45 90K 110K 166960K 6179 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 286 0 NDP 14 0K 1K 166960K 128 0 temp 87 6900K 7028K 166960K 200421 0 kqueue 13 20K 30K 166960K 805 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 120 815 0 811 11 8 3 3 0 8 2 rtentry 112 346 0 253 3 0 3 3 0 8 0 unpcb 144 4387 0 4367 24 19 5 6 0 8 4 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 808 1612 0 1607 37 29 8 11 0 8 7 arp 120 74 0 53 1 0 1 1 0 8 0 inpcb 376 6351 0 6341 57 48 9 15 0 8 7 nd6 136 67 0 44 1 0 1 1 0 8 0 pkpcb 40 30 0 30 8 7 1 1 0 8 1 kcovpl 48 17 0 8 1 0 1 1 0 8 0 ppxss 1168 34 0 34 7 6 1 1 0 8 1 pffrag 232 45 0 35 1 0 1 1 0 482 0 pffrnode 88 43 0 34 1 0 1 1 0 8 0 pffrent 40 97 0 87 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 24 337 0 194 2 0 2 2 0 8 0 pfstkey 128 337 0 194 6 0 6 6 0 8 0 pfstate 376 337 0 194 18 1 17 18 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 7 0 2 6 1 5 6 0 8 0 art_heap4 256 1690 0 1263 42 13 29 29 0 8 2 art_table 32 1697 0 1265 4 0 4 4 0 8 0 art_node 16 328 0 244 1 0 1 1 0 8 0 sysvmsgpl 40 28 0 22 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 57 0 32 1 0 1 1 0 8 0 shmpl 112 202 0 22 6 0 6 6 0 8 0 dirhash 1024 69 0 52 3 0 3 3 0 8 0 dino2pl 256 10546 0 9016 96 0 96 96 0 8 0 ffsino 280 10546 0 9016 110 0 110 110 0 8 0 nchpl 144 17636 0 17068 64 40 24 63 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 65320 0 65319 4 3 1 1 0 8 0 percpumem 16 114 0 66 1 0 1 1 0 8 0 kstatmem 264 160 0 132 6 3 3 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 14 0 14 6 5 1 1 0 8 1 scxspl 216 50170 0 50170 20 18 2 8 1 8 2 plimitpl 152 1204 0 1185 1 0 1 1 0 8 0 sigapl 424 5166 0 5092 11 2 9 9 0 8 0 futexpl 64 71351 0 71347 1 0 1 1 0 8 0 knotepl 120 657 0 0 18 0 18 18 0 8 0 kqueuepl 216 1608 0 1596 17 13 4 5 0 8 3 pipepl 328 1013 0 983 28 20 8 8 0 8 5 fdescpl 504 5097 0 5064 6 0 6 6 0 8 0 filepl 152 41125 0 40893 61 41 20 28 0 8 8 lockfpl 104 2437 0 2435 4 2 2 2 0 8 1 lockfspl 48 801 0 799 1 0 1 1 0 8 0 sessionpl 144 34 0 26 1 0 1 1 0 8 0 pgrppl 48 98 0 81 1 0 1 1 0 8 0 ucredpl 104 7357 0 7340 1 0 1 1 0 8 0 zombiepl 144 5807 0 5805 5 4 1 1 0 8 0 processpl 1168 5166 0 5092 8 2 6 6 0 8 0 procpl 648 12782 0 12700 10 2 8 8 0 8 0 srpgc 96 32 0 32 7 7 0 1 0 8 0 sosppl 168 33 0 33 7 6 1 1 0 8 1 sockpl 688 11802 0 11770 82 69 13 18 0 8 9 mcl64k 65536 7 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 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 96 0 0 10 0 10 10 0 8 0 mtagpl 96 94 0 0 3 0 3 3 0 8 0 mbufpl 256 6956 0 0 429 0 429 429 0 8 0 bufpl 280 17743 0 11577 441 0 441 441 0 8 0 anonpl 24 595202 0 580362 182 64 118 118 0 185 6 amapchunkpl 152 152232 0 151554 70 30 40 40 0 158 9 amappl16 200 13324 0 12762 109 65 44 44 0 8 6 amappl15 192 4 0 4 2 1 1 1 0 8 1 amappl14 184 154 0 141 1 0 1 1 0 8 0 amappl13 176 3 0 3 2 2 0 1 0 8 0 amappl12 168 5902 0 5869 4 2 2 3 0 8 0 amappl11 160 60 0 44 1 0 1 1 0 8 0 amappl10 152 23 0 23 1 1 0 1 0 8 0 amappl9 144 255 0 255 1 1 0 1 0 8 0 amappl8 136 22 0 19 1 0 1 1 0 8 0 amappl7 128 129 0 115 1 0 1 1 0 8 0 amappl6 120 263 0 258 1 0 1 1 0 8 0 amappl5 112 160 0 150 1 0 1 1 0 8 0 amappl4 104 363 0 341 1 0 1 1 0 8 0 amappl3 96 32614 0 32503 5 1 4 4 0 8 0 amappl2 88 818 0 750 2 0 2 2 0 8 0 amappl1 80 22882 0 22283 15 0 15 15 0 8 0 amappl 88 45737 0 45557 6 1 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 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 2 0 1 1 0 1 1 0 8 0 dma256 256 8 0 8 3 2 1 1 0 8 1 dma128 128 257 0 257 5 4 1 1 0 8 1 dma64 64 9 0 9 4 4 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 20 0 19 1 0 1 1 0 8 0 aobjpl 72 204 0 22 4 0 4 4 0 8 0 uaddrrnd 24 5097 0 5064 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5097 0 5064 1 0 1 1 0 8 0 vmmpekpl 168 36898 0 36838 4 0 4 4 0 8 0 vmmpepl 168 309633 0 307140 171 49 122 132 0 357 1 vmsppl 456 5096 0 5064 5 0 5 5 0 8 0 rwobjpl 64 78971 0 71342 134 7 127 127 0 8 0 pdppl 4096 10201 0 10128 127 52 75 87 0 8 2 pvpl 32 27983 0 0 227 2 225 225 0 265 0 pmappl 248 5096 0 5064 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 801 0 112 20 0 20 20 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(fffffd806ac88508,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806ac884f0,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806ac884f0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd80794fde60,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd80794fde60,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003c5da658) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff80003c5da658) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff80000145e880,fffffd806a15db00,ffff8000ffff3998) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff80000145e880,fffffd807b61fb00,fffffd806a15db00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff80000145e880,fffffd806a15db00,ffff80003c5da8d8,0,0,0) at sosend+0x804 sendit(ffff8000ffff3998,3,ffff80003c5daa50,0,ffff80003c5dab10) at sendit+0x721 sys/kern/uipc_syscalls.c:779 sys_sendmsg(ffff8000ffff3998,ffff80003c5dabc0,ffff80003c5dab10) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 syscall(ffff80003c5dabc0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5dabc0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xccb7c6a36d0, count: -15 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029b5bff0) 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 __mp_lock(ffffffff83670ef0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83670ef0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 ktrsyscall(ffff8000ffff9bf8,5,18,ffff80003c5c4ab0) at ktrsyscall+0x2b3 sys/kern/kern_ktrace.c:183 syscall(ffff80003c5c4ab0) at syscall+0x2e6 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80003c5c4ab0) at syscall+0x2e6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72eab76dfe00, count: -7