panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 995 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 467083 15569 0 0x2 0x1 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8345fc2b) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83409380,ffffffff8340ed96,3e3,ffffffff8340edde) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c46ef08,ffffffff8334f63d) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(0,ffff80003c46ef00) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff80003c40f9d0) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003c457250) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805ea17898,1,fffffd807f7d34e0,ffff80003c40f9d0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8068fab870,ffff80003c40f9d0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8068fab870,ffff80003c40f9d0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8068fab870,ffff80003c40f9d0) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd8068fab870,ffff80003c40f9d0) at closef+0x192 sys/kern/kern_descrip.c:1249 fdfree(ffff80003c40f9d0) at fdfree+0x116 sys/kern/kern_descrip.c:1181 exit1(ffff80003c40f9d0,0,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff80003c40f9d0,ffff80003c4575c0,ffff80003c457510) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c4575b0, count: 0 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: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 995 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8345fc2b) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83409380,ffffffff8340ed96,3e3,ffffffff8340edde) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c46ef08,ffffffff8334f63d) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(0,ffff80003c46ef00) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff80003c40f9d0) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003c457250) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805ea17898,1,fffffd807f7d34e0,ffff80003c40f9d0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8068fab870,ffff80003c40f9d0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8068fab870,ffff80003c40f9d0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8068fab870,ffff80003c40f9d0) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd8068fab870,ffff80003c40f9d0) at closef+0x192 sys/kern/kern_descrip.c:1249 fdfree(ffff80003c40f9d0) at fdfree+0x116 sys/kern/kern_descrip.c:1181 exit1(ffff80003c40f9d0,0,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff80003c40f9d0,ffff80003c4575c0,ffff80003c457510) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c4575c0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4575c0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a429bfff4a0, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c457020 rbx 0xffffffff8382fdcf cpu_info_full_primary+0x2dcf rdx 0 rcx 0xffff80003c40f9d0 rax 0xffffffff8382eff0 cpu_info_full_primary+0x1ff0 r8 0 r9 0x8080808080808080 r10 0x29a3bfd168ada3a5 r11 0xc014e1c3d4912f r12 0xffffffff8382fbd0 cpu_info_full_primary+0x2bd0 r13 0 r14 0 r15 0x1 rip 0xffffffff8275db55 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c457010 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=502054 pid=65308 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c40f9d0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c40e2c0,0xffff80003c40fc70 process=0xffff80003c410e48 user=0xffff80003c452000, vmspace=0xfffffd806becf1f8 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 42965 364104 74090 0 2 0 syz-executor 42965 228642 74090 0 3 0x4000080 fsleep syz-executor 45124 68868 15569 0 2 0 syz-executor 45124 142570 15569 0 3 0x4000080 fsleep syz-executor 45124 156388 15569 0 3 0x4000080 fsleep syz-executor 45124 392974 15569 0 3 0x4000080 fsleep syz-executor 60877 201830 66791 0 2 0xc80 syz-executor 60877 65870 66791 0 3 0x4000080 lockf syz-executor 60877 464821 66791 0 3 0x4000080 fsleep syz-executor 60877 162881 66791 0 3 0x4000080 fsleep syz-executor 29874 407692 46056 0 3 0x80 nanoslp syz-executor 29874 68803 46056 0 2 0x4000000 syz-executor 29874 483606 46056 0 3 0x4000080 fsleep syz-executor 37591 224410 13593 0 3 0x80 nanoslp syz-executor 37591 161451 13593 0 3 0x4000080 piperd syz-executor 37591 156935 13593 0 3 0x4000080 fsleep syz-executor 37591 436882 13593 0 3 0x4000080 fsleep syz-executor 17785 62060 29506 0 3 0x80 nanoslp syz-executor 17785 53746 29506 0 3 0x4000080 lockf syz-executor 17785 416490 29506 0 3 0x4000080 fsleep syz-executor 69934 323419 10781 0 2 0 syz-executor 69934 137583 10781 0 3 0x4000080 msgwait syz-executor 69934 177916 10781 0 3 0x4000080 msgwait syz-executor 69934 141205 10781 0 2 0x4000000 syz-executor 83588 467169 0 0 3 0x14200 bored sosplice 13593 41162 79055 0 2 0xc82 syz-executor 46056 25485 79055 0 3 0x82 nanoslp syz-executor 1789 175226 79055 0 3 0x82 nanoslp syz-executor 10781 315326 79055 0 2 0x2 syz-executor 29506 59660 79055 0 3 0x82 nanoslp syz-executor 74090 411860 79055 0 2 0xc82 syz-executor 66791 468333 79055 0 3 0x82 nanoslp syz-executor 15569 467083 79055 0 7 0x3 syz-executor 79055 425925 34916 0 3 0x82 kqread syz-executor 34916 176164 8605 0 3 0x10008a sigsusp ksh 8605 383485 32209 0 3 0x98 kqread sshd-session 32209 207714 24669 0 3 0x92 kqread sshd-session 2215 433070 1 0 3 0x100083 ttyin getty 24669 516742 1 0 3 0x88 kqread sshd 3155 89130 25689 74 3 0x1100092 bpf pflogd 25689 130872 1 0 3 0x80 sbwait pflogd 27071 253988 68249 73 3 0x1100090 kqread syslogd 68249 64345 1 0 3 0x100082 sbwait syslogd 689 353950 1 0 3 0x100080 kqread resolvd 89379 140556 69755 77 2 0x100012 dhcpleased 5947 511971 69755 77 3 0x100092 kqread dhcpleased 69755 468697 1 0 3 0x80 kqread dhcpleased 25840 24254 0 0 3 0x14200 bored smr 74059 249433 0 0 2 0x14200 zerothread 90123 301963 0 0 3 0x14200 aiodoned aiodoned 26212 316876 0 0 3 0x14200 syncer update 49903 464670 0 0 3 0x14200 cleaner cleaner 49711 465560 0 0 3 0x14200 reaper reaper 92117 8444 0 0 3 0x14200 pgdaemon pagedaemon 91100 451461 0 0 3 0x14200 bored viomb 47800 512797 0 0 3 0x40014200 acpi0 acpi0 36532 366930 0 0 3 0x40014200 idle1 19254 125748 0 0 3 0x14200 bored softnet3 75354 313446 0 0 3 0x14200 bored softnet2 71021 230913 0 0 3 0x14200 bored softnet1 66814 447185 0 0 2 0x14200 softnet0 26001 307326 0 0 3 0x14200 bored systqmp 58065 184962 0 0 3 0x14200 bored systq 21265 409482 0 0 3 0x14200 tmoslp softclockmp 82596 351888 0 0 2 0x40014200 softclock 16316 8288 0 0 3 0x40014200 idle0 1 190579 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 66814 (softnet0) thread 0xffff8000ffffe290 (447185) shared rwlock softnet0 r = 0 (0xffff80000002c078) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10195 11035K 11382K 166960K 11632 0 pcb 17 12K 12K 166960K 48 0 rtable 237 7K 7K 166960K 428 0 pf 36 18K 22K 166960K 72 0 ifaddr 42 7K 8K 166960K 61 0 ifgroup 55 2K 2K 166960K 84 0 sysctl 3 1K 1K 166960K 3 0 counters 66 36K 37K 166960K 86 0 ioctlops 0 0K 4K 166960K 1518 0 iov 0 0K 16K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1413 89K 89K 166960K 1612 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 17 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 97K 166960K 349 0 sigio 0 0K 0K 166960K 4 0 proc 72 91K 140K 166960K 582 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 100 0 in_multi 95 7K 7K 166960K 124 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 435 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 264 161K 173K 166960K 4940 0 UVM aobj 43 2K 2K 166960K 43 0 pinsyscall 43 86K 108K 166960K 1508 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 13 0K 1K 166960K 39 0 temp 45 8652K 8716K 166960K 5553 0 kqueue 16 26K 28K 166960K 60 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 50 0 46 1 0 1 1 0 8 0 rtentry 176 133 0 24 6 0 6 6 0 8 0 unpcb 144 144 0 125 2 0 2 2 0 8 1 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 808 63 0 57 1 0 1 1 0 8 0 arp 128 21 0 3 1 0 1 1 0 8 0 inpcb 384 290 0 281 2 0 2 2 0 8 0 nd6 144 30 0 6 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 6 0 5 1 0 1 1 0 8 0 pppxif 1504 3 0 2 1 0 1 1 0 8 0 pfstscr 40 3 0 3 1 0 1 1 0 8 1 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 3 0 1 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 pfrktable 1344 1 0 1 1 0 1 1 0 8 1 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfqueue 320 1 0 0 1 0 1 1 0 8 0 pfstitem 24 29 0 0 1 0 1 1 0 8 0 pfstkey 128 33 0 4 1 0 1 1 0 8 0 pfstate 384 31 0 2 3 0 3 3 0 8 0 pfrule 1344 24 0 19 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 531 0 92 29 0 29 29 0 8 1 art_table 32 532 0 92 4 0 4 4 0 8 0 art_node 16 131 0 31 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 2 1 0 1 1 0 8 0 semapl 112 15 0 5 1 0 1 1 0 8 0 shmpl 112 40 0 0 2 0 2 2 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 1957 0 444 95 0 95 95 0 8 0 ffsino 288 1957 0 444 109 0 109 109 0 8 0 nchpl 144 2407 0 712 64 0 64 64 0 8 1 uvmvnodes 80 2214 0 0 46 0 46 46 0 8 0 vnodes 216 2214 0 0 123 0 123 123 0 8 0 namei 1024 7886 0 7886 2 1 1 2 0 8 1 percpumem 16 58 0 10 1 0 1 1 0 8 0 kstatmem 264 40 0 16 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 7538 0 7538 5 2 3 3 1 8 3 plimitpl 152 59 0 42 1 0 1 1 0 8 0 sigapl 424 662 0 611 8 1 7 7 0 8 1 knotepl 120 297 0 0 9 0 9 9 0 8 0 kqueuepl 224 80 0 66 2 0 2 2 0 8 1 pipepl 336 134 0 104 3 0 3 3 0 8 0 fdescpl 520 642 0 610 3 0 3 3 0 8 0 filepl 160 2856 0 2624 13 0 13 13 0 8 2 lockfpl 104 133 0 127 1 0 1 1 0 8 0 lockfspl 48 33 0 29 1 0 1 1 0 8 0 sessionpl 144 26 0 17 1 0 1 1 0 8 0 pgrppl 48 39 0 22 1 0 1 1 0 8 0 ucredpl 104 271 0 257 1 0 1 1 0 8 0 zombiepl 144 612 0 611 1 0 1 1 0 8 0 processpl 1208 662 0 611 5 0 5 5 0 8 0 procpl 656 1019 0 951 7 1 6 6 0 8 0 srpgc 96 2 0 2 1 0 1 1 0 8 1 sockpl 728 553 0 521 5 0 5 5 0 8 1 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 112 0 0 14 0 14 14 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mtagpl 96 7 0 0 1 0 1 1 0 8 0 mbufpl 256 174 0 0 11 0 11 11 0 8 0 bufpl 280 2603 0 124 178 0 178 178 0 8 0 anonpl 32 4817 0 0 39 0 39 39 0 246 0 amapchunkpl 152 14568 0 14003 22 0 22 22 0 158 0 amappl16 200 2152 0 2122 8 2 6 6 0 8 4 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 127 0 115 1 0 1 1 0 8 0 amappl13 176 7 0 7 2 2 0 1 0 8 0 amappl12 168 1321 0 1289 4 1 3 3 0 8 0 amappl11 160 49 0 35 1 0 1 1 0 8 0 amappl10 152 6 0 6 2 1 1 1 0 8 1 amappl9 144 323 0 322 2 1 1 1 0 8 0 amappl8 136 25 0 23 1 0 1 1 0 8 0 amappl7 128 132 0 120 1 0 1 1 0 8 0 amappl6 120 192 0 189 1 0 1 1 0 8 0 amappl5 112 130 0 120 1 0 1 1 0 8 0 amappl4 104 343 0 322 1 0 1 1 0 8 0 amappl3 96 2675 0 2548 5 1 4 4 0 8 0 amappl2 88 690 0 629 2 0 2 2 0 8 0 amappl1 80 9980 0 9368 15 0 15 15 0 8 1 amappl 88 4165 0 3975 5 0 5 5 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 42 0 0 1 0 1 1 0 8 0 uaddrrnd 24 642 0 610 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 642 0 610 1 0 1 1 0 8 0 vmmpekpl 168 7193 0 7156 2 0 2 2 0 8 0 vmmpepl 168 48126 0 46065 97 1 96 96 0 357 6 vmsppl 480 641 0 610 5 0 5 5 0 8 0 rwobjpl 72 17941 0 14720 59 0 59 59 0 8 0 pdppl 4096 1291 0 1220 105 34 71 87 0 8 0 pvpl 32 13684 0 0 111 0 111 111 0 265 0 pmappl 256 641 0 610 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 385 0 37 11 0 11 11 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 panic(ffffffff8345fc2b) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83409380,ffffffff8340ed96,3e3,ffffffff8340edde) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c46ef08,ffffffff8334f63d) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(0,ffff80003c46ef00) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff80003c40f9d0) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003c457250) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805ea17898,1,fffffd807f7d34e0,ffff80003c40f9d0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8068fab870,ffff80003c40f9d0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8068fab870,ffff80003c40f9d0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8068fab870,ffff80003c40f9d0) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd8068fab870,ffff80003c40f9d0) at closef+0x192 sys/kern/kern_descrip.c:1249 fdfree(ffff80003c40f9d0) at fdfree+0x116 sys/kern/kern_descrip.c:1181 exit1(ffff80003c40f9d0,0,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff80003c40f9d0,ffff80003c4575c0,ffff80003c457510) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c4575c0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4575c0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a429bfff4a0, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp 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 __mp_lock(ffffffff838f9c78) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838f9c78) at __mp_lock+0x192 sys/kern/kern_lock.c:144 ktrsysret(ffff8000ffff3c40,b,0,ffff80002a2fa060) at ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000ffff3c40,b,0,ffff80002a2fa060) at ktrsysret+0xde sys/kern/kern_ktrace.c:209 syscall(ffff80002a2fa110) at syscall+0xa43 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a2fa110) at syscall+0xa43 sys/arch/amd64/amd64/trap.c:600 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x710697a387e0, count: 8 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 __mp_lock(ffffffff838f9c78) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838f9c78) at __mp_lock+0x192 sys/kern/kern_lock.c:144 ktrsysret(ffff8000ffff3c40,b,0,ffff80002a2fa060) at ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000ffff3c40,b,0,ffff80002a2fa060) at ktrsysret+0xde sys/kern/kern_ktrace.c:209 syscall(ffff80002a2fa110) at syscall+0xa43 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a2fa110) at syscall+0xa43 sys/arch/amd64/amd64/trap.c:600 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x710697a387e0, count: -7