witness: userret: returning with the following locks held: exclusive rwlock solock r = 0 (0xfffffd806a42ee00) #0 witness_lock+0x44d #1 unp_solock_peer+0xa6 sys/kern/uipc_usrreq.c:163 #2 uipc_usrreq+0x7c6 sys/kern/uipc_usrreq.c:350 #3 sosend+0x61b sys/kern/uipc_socket.c:657 #4 sendit+0x65d sys/kern/uipc_syscalls.c:682 #5 sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:589 #6 syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] #6 syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 #7 Xsyscall+0x128 panic: witness_warn Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *497161 83969 0 0 0x4000000 0 syz-executor.5 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82593e80) at panic+0x177 sys/kern/subr_prf.c:202 witness_warn(2,0,ffffffff82620d13) at witness_warn+0x65e witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_warn(2,0,ffffffff82620d13) at witness_warn+0x65e sys/kern/subr_witness.c:1473 userret(ffff800024793270) at userret+0x265 sys/kern/kern_sig.c:2012 syscall(ffff80002e58b630) at syscall+0x57e mi_syscall_return sys/sys/syscall_mi.h:128 [inline] syscall(ffff80002e58b630) at syscall+0x57e sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xba6269be7d0, count: 9 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: witness_warn ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82593e80) at panic+0x177 sys/kern/subr_prf.c:202 witness_warn(2,0,ffffffff82620d13) at witness_warn+0x65e witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_warn(2,0,ffffffff82620d13) at witness_warn+0x65e sys/kern/subr_witness.c:1473 userret(ffff800024793270) at userret+0x265 sys/kern/kern_sig.c:2012 syscall(ffff80002e58b630) at syscall+0x57e mi_syscall_return sys/sys/syscall_mi.h:128 [inline] syscall(ffff80002e58b630) at syscall+0x57e sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xba6269be7d0, count: -6 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e58b360 rbx 0xffffffff82937bb7 cpu_info_full_primary+0x2bb7 rdx 0xffff800000cc8d40 rcx 0 rax 0xffff800024793270 r8 0x101010101010101 r9 0x8080808080808080 r10 0x5d8766e1df23c0bd r11 0x2dad66f665e9b6cd r12 0xffffffff829379b8 cpu_info_full_primary+0x29b8 r13 0 r14 0 r15 0x1 rip 0xffffffff81d03c18 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e58b350 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.5) pid=497161 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800024792a90,0xffffffff82a6ea48 process=0xffff8000fffe6588 user=0xffff80002e586000, vmspace=0xfffffd807dd0bbb0 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=4, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 83969 277189 54887 0 2 0 syz-executor.5 *83969 497161 54887 0 7 0x4000000 syz-executor.5 47898 347924 46571 0 2 0 syz-executor.0 32884 377452 41412 0 2 0 syz-executor.2 32884 249064 41412 0 3 0x4000080 fsleep syz-executor.2 4034 281851 61413 0 2 0 syz-executor.7 4034 156402 61413 0 3 0x4000080 fsleep syz-executor.7 86499 126209 547 0 2 0 syz-executor.4 86499 15878 547 0 3 0x4000080 fsleep syz-executor.4 86499 258175 547 0 3 0x4000080 fsleep syz-executor.4 49447 356694 15574 0 2 0 syz-executor.3 49447 473568 15574 0 3 0x4000080 ttyin syz-executor.3 52193 129052 34426 0 2 0 syz-executor.1 52193 109262 34426 0 3 0x4000080 fsleep syz-executor.1 61413 417798 19266 0 2 0x482 syz-executor.7 54887 319960 19266 0 2 0x482 syz-executor.5 34426 246799 19266 0 2 0x482 syz-executor.1 66583 6476 19266 0 2 0x2 syz-executor.6 41412 99002 19266 0 2 0x482 syz-executor.2 547 131156 19266 0 2 0x482 syz-executor.4 15574 342138 19266 0 2 0x482 syz-executor.3 56275 448696 0 0 3 0x14200 acct acct 46571 151609 19266 0 2 0x482 syz-executor.0 30156 414600 0 0 3 0x14280 nfsidl nfsio 80594 206124 0 0 3 0x14280 nfsidl nfsio 87805 159903 0 0 3 0x14280 nfsidl nfsio 23968 438404 0 0 3 0x14280 nfsidl nfsio 79995 364345 0 0 3 0x14280 nfsidl nfsio 17885 255568 0 0 3 0x14280 nfsidl nfsio 27053 5310 0 0 3 0x14280 nfsidl nfsio 70683 129435 0 0 3 0x14280 nfsidl nfsio 52042 324603 0 0 3 0x14280 nfsidl nfsio 21943 278707 0 0 3 0x14280 nfsidl nfsio 8447 300130 0 0 3 0x14280 nfsidl nfsio 56292 176800 0 0 3 0x14280 nfsidl nfsio 71611 144872 0 0 3 0x14280 nfsidl nfsio 78239 353720 0 0 3 0x14280 nfsidl nfsio 47684 339219 0 0 3 0x14280 nfsidl nfsio 70051 417190 0 0 3 0x14280 nfsidl nfsio 78164 240395 0 0 3 0x14280 nfsidl nfsio 41 196227 0 0 3 0x14280 nfsidl nfsio 7132 362796 0 0 3 0x14280 nfsidl nfsio 69149 422105 0 0 3 0x14280 nfsidl nfsio 41103 2582 0 0 3 0x14200 bored sosplice 12946 12896 1 0 3 0x100083 ttyopn getty 19266 420719 91286 0 3 0x82 thrsleep syz-fuzzer 19266 465860 91286 0 2 0x4000482 syz-fuzzer 19266 256134 91286 0 3 0x4000082 thrsleep syz-fuzzer 19266 515599 91286 0 3 0x4000082 thrsleep syz-fuzzer 19266 438167 91286 0 3 0x4000082 thrsleep syz-fuzzer 19266 209394 91286 0 3 0x4000082 thrsleep syz-fuzzer 19266 283554 91286 0 2 0x4000482 syz-fuzzer 19266 212957 91286 0 3 0x4000082 kqread syz-fuzzer 19266 370343 91286 0 3 0x4000082 thrsleep syz-fuzzer 91286 118751 30346 0 3 0x10008a sigsusp ksh 30346 466851 77554 0 3 0x9a kqread sshd 77554 89691 1 0 3 0x88 kqread sshd 34048 294613 73716 74 3 0x1100092 bpf pflogd 73716 433727 1 0 3 0x80 netio pflogd 51046 206723 83565 73 2 0x1100090 syslogd 83565 147390 1 0 3 0x100082 netio syslogd 17347 471921 1 0 3 0x100080 kqread resolvd 4631 157010 15945 77 3 0x100092 kqread dhcpleased 28152 279727 15945 77 3 0x100092 kqread dhcpleased 15945 176965 1 0 3 0x80 kqread dhcpleased 28423 357553 0 0 3 0x14200 bored smr 2630 44632 0 0 2 0x14200 zerothread 70664 254272 0 0 3 0x14200 aiodoned aiodoned 3583 218053 0 0 3 0x14200 syncer update 17543 128318 0 0 3 0x14200 cleaner cleaner 21368 249457 0 0 3 0x14200 reaper reaper 69603 454177 0 0 3 0x14200 pgdaemon pagedaemon 79374 189276 0 0 3 0x14200 bored viomb 89587 60232 0 0 3 0x40014200 acpi0 acpi0 11629 267728 0 0 7 0x40014200 idle1 56311 293785 0 0 3 0x14200 bored softnet 59160 470842 0 0 3 0x14200 bored softnet 45803 505655 0 0 3 0x14200 bored softnet 62664 455145 0 0 3 0x14200 bored softnet 23978 431970 0 0 2 0x14200 systqmp 72615 393609 0 0 3 0x14200 bored systq 12841 490202 0 0 2 0x40014200 softclock 54221 10464 0 0 3 0x40014200 idle0 1 173397 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 83969 (syz-executor.5) thread 0xffff800024793270 (497161) exclusive rwlock solock r = 0 (0xfffffd806a42ee00) #0 witness_lock+0x44d #1 unp_solock_peer+0xa6 sys/kern/uipc_usrreq.c:163 #2 uipc_usrreq+0x7c6 sys/kern/uipc_usrreq.c:350 #3 sosend+0x61b sys/kern/uipc_socket.c:657 #4 sendit+0x65d sys/kern/uipc_syscalls.c:682 #5 sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:589 #6 syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] #6 syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 #7 Xsyscall+0x128 Process 49447 (syz-executor.3) thread 0xffff800024793a50 (473568) exclusive rrwlock inode r = 0 (0xfffffd8067e825f8) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:567 #5 spec_open+0x3ee sys/kern/spec_vnops.c:156 #6 VOP_OPEN+0x75 sys/kern/vfs_vops.c:138 #7 vn_open+0x467 sys/kern/vfs_vnops.c:180 #8 vndioctl+0xa07 sys/dev/vnd.c:459 #9 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #10 vn_ioctl+0xbc sys/kern/vfs_vnops.c:528 #11 sys_ioctl+0x4a2 #12 syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] #12 syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 #13 Xsyscall+0x128 Process 66583 (syz-executor.6) thread 0xffff8000fffecfc8 (6476) exclusive rrwlock inode r = 0 (0xfffffd806795d3c8) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:518 #4 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347 #6 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1150 #8 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:388 #9 domkdirat+0x121 sys/kern/vfs_syscalls.c:3116 #10 syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] #10 syscall+0x435 sys/arch/amd64/amd64/trap.c:585 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8064fdfc48) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:567 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3101 #8 syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] #8 syscall+0x435 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10231 6515K 14771K 78643K 73531 0 pcb 13 22K 26K 78643K 5336 0 rtable 269 20K 22K 78643K 11229 0 ifaddr 106 29K 31K 78643K 3562 0 sysctl 3 1K 2K 78643K 9 0 counters 56 35K 36K 78643K 800 0 ioctlops 0 0K 4K 78643K 7645 0 iov 0 0K 32K 78643K 3628 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1520 95K 95K 78643K 20141 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 272 0 VM map 2 1K 1K 78643K 2 0 sem 10 16K 17K 78643K 50 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 17 61K 89K 78643K 30508 0 sigio 0 0K 0K 78643K 621 0 proc 72 91K 127K 78643K 5702 0 subproc 104 6K 6K 78643K 1778 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1311 0 in_multi 94 6K 6K 78643K 2341 0 ether_multi 1 0K 0K 78643K 129 0 mrt 71 4K 4K 78643K 166 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 253 1129K 1129K 78643K 253 0 exec 0 0K 2K 78643K 7742 0 pfkey data 0 0K 0K 78643K 84 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 917 2552K 2556K 78643K 164987 0 UVM aobj 131 4K 4K 78643K 132 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 1242 0 NDP 16 0K 2K 78643K 733 0 temp 1105 6655K 72178K 78643K 313986 0 kqueue 12 18K 26K 78643K 2074 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 1764 0 1761 23 22 1 3 0 8 0 rtentry 112 2206 0 2107 6 3 3 4 0 8 0 unpcb 144 14733 0 14714 186 184 2 10 0 8 1 syncache 296 158 0 158 36 36 0 1 0 8 0 tcpqe 32 107 0 107 19 19 0 1 0 8 0 tcpcb 736 40311 0 40284 768 764 4 30 0 8 1 arp 120 303 0 287 1 0 1 1 0 8 0 inpcb 320 56480 0 56465 507 497 10 18 0 8 8 ip6q 72 10 0 10 3 3 0 1 0 8 0 ip6af 40 62 0 62 3 3 0 1 0 8 0 nd6 48 515 0 492 1 0 1 1 0 8 0 pkpcb 40 203 0 203 20 20 0 2 0 8 0 kcovpl 48 136 0 128 1 0 1 1 0 8 0 ppxss 1256 118 0 118 28 28 0 1 0 8 0 pfstscr 40 209 0 209 20 19 1 1 0 8 1 pffrag 232 11 0 11 3 3 0 1 0 482 0 pffrnode 88 11 0 11 3 3 0 1 0 8 0 pffrent 40 38 914 38 3 3 0 1 0 8 0 pfosfp 40 1503 0 1074 5 0 5 5 0 8 0 pfosfpen 112 1503 0 734 23 1 22 22 0 8 0 pfrktable 1344 2573 0 2552 12 9 3 3 0 8 0 pftag 88 56 0 47 1 0 1 1 0 8 0 pfqueue 264 27 0 27 7 7 0 1 0 8 0 pfstitem 24 97 0 95 1 0 1 1 0 8 0 pfstkey 120 474 0 472 2 1 1 2 0 8 0 pfstate 336 281 0 279 3 2 1 3 0 8 0 pfrule 1360 1783 0 1680 26 17 9 9 0 8 0 rttmr 136 25 0 25 7 7 0 1 0 8 0 art_heap8 4096 4 0 3 4 3 1 4 0 8 0 art_heap4 256 10077 0 9593 83 52 31 31 0 8 0 art_table 32 10081 0 9596 5 1 4 4 0 8 0 art_node 16 2099 0 2011 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 5 1 1 0 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 shmpl 112 129 0 1 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 41035 0 39456 99 0 99 99 0 8 0 ffsino 272 41035 0 39456 106 0 106 106 0 8 0 nchpl 144 80645 0 80084 63 40 23 63 0 8 0 uvmvnodes 80 6900 0 0 141 0 141 141 0 8 0 vnodes 224 6900 0 0 406 0 406 406 0 8 0 namei 1024 291536 0 291535 11 10 1 2 0 8 0 percpumem 16 412 0 372 1 0 1 1 0 8 0 vcpupl 2048 329 0 1 41 0 41 41 0 8 0 vmpool 568 432 0 104 24 0 24 24 0 8 0 pfiaddrpl 120 975 0 941 7 5 2 2 0 8 0 kstatmem 264 772 0 744 30 28 2 3 0 8 0 scsiplug 72 14 0 14 5 5 0 1 0 8 0 scxspl 216 230126 0 230126 27 26 1 8 0 8 1 plimitpl 152 3738 0 3723 1 0 1 1 0 8 0 sigapl 424 30578 0 30509 11 3 8 8 0 8 0 futexpl 64 297461 0 297456 8 7 1 1 0 8 0 knotepl 120 1598 0 0 12 2 10 10 0 8 0 kqueuepl 224 5135 0 5127 91 90 1 5 0 8 0 pipepl 336 6245 0 6217 167 164 3 10 0 8 0 fdescpl 496 30532 0 30502 6 1 5 5 0 8 0 filepl 152 213492 0 213242 357 342 15 24 0 8 5 lockfpl 104 10433 0 10430 23 22 1 2 0 8 0 lockfspl 48 3244 0 3241 1 0 1 1 0 8 0 sessionpl 144 154 0 137 1 0 1 1 0 8 0 pgrppl 48 345 0 328 1 0 1 1 0 8 0 ucredpl 104 26120 0 26103 1 0 1 1 0 8 0 zombiepl 144 30509 0 30509 2 1 1 1 0 8 1 processpl 1064 30578 0 30509 5 0 5 5 0 8 0 procpl 672 74847 0 74763 34 26 8 9 0 8 0 srpgc 96 241 0 241 38 38 0 1 0 8 0 sosppl 168 191 0 191 26 26 0 1 0 8 0 sockpl 504 73229 0 73182 1062 1044 18 38 0 8 10 mcl64k 65536 16 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 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 7 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 339 0 0 21 0 21 21 0 8 0 mtagpl 96 1730 0 0 16 0 16 16 0 8 0 mbufpl 256 4362 0 0 202 0 202 202 0 8 0 bufpl 288 47878 0 40977 494 0 494 494 0 8 0 anonpl 24 5601130 0 5579455 534 384 150 173 0 186 0 amapchunkpl 152 493710 0 492696 145 97 48 56 0 158 0 amappl16 200 78079 0 77089 249 193 56 67 0 8 0 amappl15 192 3094 0 3093 3 2 1 1 0 8 0 amappl14 184 3283 0 3277 1 0 1 1 0 8 0 amappl13 176 5982 0 5975 1 0 1 1 0 8 0 amappl12 168 5505 0 5493 1 0 1 1 0 8 0 amappl11 160 4010 0 3989 2 0 2 2 0 8 0 amappl10 152 1442 0 1433 1 0 1 1 0 8 0 amappl9 144 5364 0 5359 1 0 1 1 0 8 0 amappl8 136 5950 0 5792 6 0 6 6 0 8 0 amappl7 128 3423 0 3407 1 0 1 1 0 8 0 amappl6 120 5944 0 5918 3 2 1 2 0 8 0 amappl5 112 22418 0 22400 1 0 1 1 0 8 0 amappl4 104 10039 0 9993 2 0 2 2 0 8 0 amappl3 96 94848 0 94743 3 0 3 3 0 8 0 amappl2 88 38656 0 38588 3 1 2 3 0 8 0 amappl1 80 706757 0 706083 27 12 15 20 0 8 0 amappl 88 161402 0 161028 12 3 9 9 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 72 131 0 1 3 0 3 3 0 8 0 uaddrrnd 24 30964 0 30606 3 0 3 3 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 30964 0 30606 3 0 3 3 0 8 0 vmmpekpl 168 198135 0 198038 5 0 5 5 0 8 0 vmmpepl 168 2966320 0 2962491 587 407 180 199 0 357 1 vmsppl 368 30963 0 30606 36 3 33 33 0 8 0 rwobjpl 56 687783 0 678361 186 52 134 134 0 8 0 pdppl 4096 61935 0 61540 1782 1385 397 399 0 8 2 pvpl 32 11405865 0 11385326 737 532 205 256 0 265 0 pmappl 248 30963 0 30606 26 3 23 23 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 4944 0 3474 43 0 43 43 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82593e80) at panic+0x177 sys/kern/subr_prf.c:202 witness_warn(2,0,ffffffff82620d13) at witness_warn+0x65e witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_warn(2,0,ffffffff82620d13) at witness_warn+0x65e sys/kern/subr_witness.c:1473 userret(ffff800024793270) at userret+0x265 sys/kern/kern_sig.c:2012 syscall(ffff80002e58b630) at syscall+0x57e mi_syscall_return sys/sys/syscall_mi.h:128 [inline] syscall(ffff80002e58b630) at syscall+0x57e sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xba6269be7d0, count: -6 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a 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+0x23 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020dd8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a 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+0x23 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020dd8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: -5