panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 955 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 375797 81540 0 0x2 0x1 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83451c58) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348ceed,ffffffff8349b4e7,3bb,ffffffff834c44a6) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c4274e8,ffffffff83445af9) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(285b9a,ffff80003c4274e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff8000fffe3250) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c422530) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806112d980,41,fffffd80097fd2d8,ffff8000fffe3250) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c6ab0e0,ffff8000fffe3250) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c6ab0e0,ffff8000fffe3250) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c6ab0e0,ffff8000fffe3250) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd806c6ab0e0,ffff8000fffe3250) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff8000fffe3250) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff8000fffe3250,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffe3250,ffff80003c4228a0,ffff80003c4227f0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c422890, 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 955 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83451c58) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348ceed,ffffffff8349b4e7,3bb,ffffffff834c44a6) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c4274e8,ffffffff83445af9) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(285b9a,ffff80003c4274e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff8000fffe3250) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c422530) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806112d980,41,fffffd80097fd2d8,ffff8000fffe3250) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c6ab0e0,ffff8000fffe3250) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c6ab0e0,ffff8000fffe3250) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c6ab0e0,ffff8000fffe3250) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd806c6ab0e0,ffff8000fffe3250) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff8000fffe3250) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff8000fffe3250,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffe3250,ffff80003c4228a0,ffff80003c4227f0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c4228a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4228a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75382282dd10, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c422300 rbx 0xffffffff8390fe07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff8000fffe3250 rax 0xffffffff8390eff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xa37f6277c63bf532 r11 0x1e63e5470c0ea093 r12 0xffffffff8390fc08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff81648fe5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c4222f0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=198350 pid=10882 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000fffe3250 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000fffe0560,0xffff8000fffe02d8 process=0xffff8000fffed828 user=0xffff80003c41d000, vmspace=0xfffffd8076905b98 estcpu=36, cpticks=10, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 48506 54439 46970 60929 2 0x3010 syz-executor 1159 334685 30265 0 2 0 syz-executor 1159 9092 30265 0 3 0x4000080 fsleep syz-executor 93053 184239 81540 0 3 0x80 nanoslp syz-executor 93053 257214 81540 0 3 0x4000000 smrbar syz-executor 93053 381019 81540 0 3 0x4000080 fsleep syz-executor 23861 33496 45822 0 3 0x80 nanoslp syz-executor 23861 283499 45822 0 3 0x4000080 sbwait syz-executor 88215 72157 74966 0 3 0x82 nanoslp syz-executor 81540 375797 74966 0 7 0x3 syz-executor 8052 407095 0 0 3 0x14280 nfsidl nfsio 33905 496417 0 0 3 0x14280 nfsidl nfsio 41315 37366 0 0 3 0x14280 nfsidl nfsio 28412 61084 0 0 3 0x14280 nfsidl nfsio 12373 509430 0 0 3 0x14280 nfsidl nfsio 75204 436536 0 0 3 0x14280 nfsidl nfsio 50118 76420 0 0 3 0x14280 nfsidl nfsio 50239 252145 0 0 3 0x14280 nfsidl nfsio 48468 279246 0 0 3 0x14280 nfsidl nfsio 89980 474327 0 0 3 0x14280 nfsidl nfsio 8956 95506 0 0 3 0x14280 nfsidl nfsio 76820 103261 0 0 3 0x14280 nfsidl nfsio 18601 49320 0 0 3 0x14280 nfsidl nfsio 96869 394489 0 0 3 0x14280 nfsidl nfsio 15311 403330 0 0 3 0x14280 nfsidl nfsio 20435 485819 0 0 3 0x14280 nfsidl nfsio 71128 409006 0 0 3 0x14280 nfsidl nfsio 5758 402093 0 0 3 0x14280 nfsidl nfsio 54057 177702 0 0 3 0x14280 nfsidl nfsio 84540 162609 0 0 3 0x14280 nfsidl nfsio 45822 98822 74966 0 3 0x82 nanoslp syz-executor 30265 254794 74966 0 3 0x82 nanoslp syz-executor 58996 495038 74966 0 3 0x82 nanoslp syz-executor 85909 196379 74966 0 3 0x82 wait syz-executor 84085 363572 74966 0 3 0x82 nanoslp syz-executor 46970 383667 74966 0 3 0x82 nanoslp syz-executor 74966 347358 21757 0 3 0x82 kqread syz-executor 21757 124316 91003 0 3 0x10008a sigsusp ksh 91003 220100 45295 0 3 0x98 kqread sshd-session 45295 92996 40352 0 3 0x92 kqread sshd-session 11755 21921 1 0 3 0x100083 ttyopn getty 40352 430711 1 0 3 0x88 kqread sshd 71272 446638 48613 74 3 0x1100092 bpf pflogd 48613 271802 1 0 3 0x80 sbwait pflogd 85474 489156 76313 73 3 0x1100090 kqread syslogd 76313 330673 1 0 3 0x100082 sbwait syslogd 52218 36228 1 0 3 0x100080 kqread resolvd 91556 322623 93071 77 3 0x100092 kqread dhcpleased 65314 432116 93071 77 3 0x100092 kqread dhcpleased 93071 26190 1 0 3 0x80 kqread dhcpleased 67044 131091 0 0 3 0x14200 bored smr 82455 405368 0 0 2 0x14200 zerothread 29679 103644 0 0 3 0x14200 aiodoned aiodoned 78216 32036 0 0 3 0x14200 syncer update 48431 264312 0 0 3 0x14200 cleaner cleaner 34512 345680 0 0 2 0x14200 reaper 38383 509231 0 0 3 0x14200 pgdaemon pagedaemon 74032 471164 0 0 3 0x14200 bored viomb 34165 268265 0 0 3 0x40014200 acpi0 acpi0 41157 315549 0 0 3 0x40014200 idle1 6324 172075 0 0 3 0x14200 bored softnet1 64363 433153 0 0 3 0x14200 bored softnet0 22541 421053 0 0 3 0x14200 smrbar systqmp 65316 278247 0 0 3 0x14200 bored systq 82486 466835 0 0 3 0x14200 tmoslp softclockmp 51510 480897 0 0 3 0x40014200 tmoslp softclock 21072 430932 0 0 3 0x40014200 idle0 1 56953 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 34512 (reaper) thread 0xffff8000ffffd9f8 (345680) exclusive rwlock kmmaplk r = 0 (0xffffffff8398ea60) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5171 #3 uvm_unmap+0x7d sys/uvm/uvm_map.c:1798 #4 km_free+0x87 sys/uvm/uvm_km.c:714 #5 uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304 #6 reaper+0x1ca sys/kern/kern_exit.c:493 #7 proc_trampoline+0x10 Process 22541 (systqmp) thread 0xffff8000ffffe530 (421053) shared rwlock systqmp r = 0 (0xffffffff8391e118) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 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 11077 12171K 14268K 166960K 13019 0 pcb 17 13K 14K 166960K 206 0 rtable 224 9K 11K 166960K 544 0 pf 38 18K 22K 166960K 97 0 ifaddr 44 7K 8K 166960K 76 0 ifgroup 53 2K 2K 166960K 100 0 sysctl 3 1K 9K 166960K 10 0 counters 72 37K 37K 166960K 114 0 ioctlops 0 0K 4K 166960K 1601 0 iov 0 0K 24K 166960K 60 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1416 89K 90K 166960K 1941 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 31 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 236K 166960K 673 0 sigio 1 0K 0K 166960K 8 0 proc 72 115K 164K 166960K 656 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 80 0 in_multi 96 6K 7K 166960K 159 0 ether_multi 1 0K 0K 166960K 11 0 mrt 0 0K 0K 166960K 32 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 498 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 243 167K 184K 166960K 7845 0 UVM aobj 21 10K 10K 166960K 22 0 pinsyscall 43 86K 103K 166960K 1862 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 65 0 NDP 12 0K 2K 166960K 48 0 temp 65 9080K 9148K 166960K 34943 0 kqueue 13 20K 28K 166960K 116 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 120 149 0 145 3 1 2 2 0 8 1 rtentry 176 153 0 58 6 0 6 6 0 8 0 unpcb 144 280 0 261 1 0 1 1 0 8 0 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpcb 736 220 0 215 7 6 1 7 0 8 0 arp 136 24 0 7 1 0 1 1 0 8 0 inpcb 328 829 0 821 17 10 7 7 0 8 6 nd6 152 33 0 10 1 0 1 1 0 8 0 pkpcb 40 5 0 5 2 1 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1192 17 0 16 2 1 1 1 0 8 0 pppxif 1504 1 0 0 1 0 1 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 10 0 4 1 0 1 1 0 482 0 pffrnode 88 10 0 4 1 0 1 1 0 8 0 pffrent 40 16 0 10 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 3 0 3 1 1 0 1 0 8 0 pfanchor 1288 1 0 1 1 1 0 1 0 8 0 pftag 88 1 0 1 1 1 0 1 0 8 0 pfstitem 24 68 0 19 1 0 1 1 0 8 0 pfstkey 128 70 0 21 2 0 2 2 0 8 0 pfstate 448 68 0 20 6 0 6 6 0 8 0 pfrule 1360 27 0 21 2 1 1 2 0 8 0 rttmr 136 4 0 4 3 2 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 765 0 288 41 11 30 31 0 8 0 art_table 40 767 0 288 5 0 5 5 0 8 0 art_node 32 151 0 66 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 5 1 0 1 1 0 8 0 semapl 112 27 0 17 1 0 1 1 0 8 0 shmpl 112 17 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2584 0 1112 93 0 93 93 0 8 0 ffsino 296 2584 0 1112 114 0 114 114 0 8 0 nchpl 144 3487 0 1780 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 1 0 1 0 8 0 vnodes 216 3017 0 0 168 0 168 168 0 8 0 namei 1024 11646 0 11646 2 1 1 1 0 8 1 percpumem 16 72 0 21 1 0 1 1 0 8 0 vcpupl 3968 2 0 0 1 0 1 1 0 8 0 vmpool 848 2 0 0 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 1 1 1 0 1 0 8 0 kstatmem 264 58 0 32 3 1 2 3 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 12904 0 12904 9 8 1 8 1 8 1 plimitpl 152 148 0 131 1 0 1 1 0 8 0 sigapl 424 993 0 925 8 0 8 8 0 8 0 knotepl 120 361 0 0 11 0 11 11 0 8 0 kqueuepl 224 214 0 204 3 1 2 2 0 8 1 pipepl 344 166 0 138 3 0 3 3 0 8 0 fdescpl 528 955 0 923 3 0 3 3 0 8 0 filepl 160 5122 0 4897 19 6 13 15 0 8 3 lockfpl 104 261 0 258 1 0 1 1 0 8 0 lockfspl 48 115 0 112 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 110 0 93 1 0 1 1 0 8 0 ucredpl 104 841 0 826 1 0 1 1 0 8 0 zombiepl 144 1030 0 1025 1 0 1 1 0 8 0 processpl 1232 993 0 925 6 0 6 6 0 8 0 procpl 664 1873 0 1799 8 1 7 8 0 8 0 sosppl 176 5 0 5 2 2 0 1 0 8 0 sockpl 752 1281 0 1250 22 12 10 10 0 8 6 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 130 0 0 17 0 17 17 0 8 0 mcl2k 2048 22 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 1777 0 0 112 0 112 112 0 8 0 bufpl 280 4382 0 105 306 0 306 306 0 8 0 anonpl 32 6502 0 0 53 0 53 53 0 246 0 amapchunkpl 152 31032 0 30514 45 22 23 36 0 158 1 amappl16 200 2689 0 2658 10 7 3 5 0 8 0 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 459 0 458 1 0 1 1 0 8 0 amappl13 176 129 0 117 1 0 1 1 0 8 0 amappl12 168 1211 0 1180 2 0 2 2 0 8 0 amappl11 160 4 0 4 2 1 1 1 0 8 1 amappl10 152 64 0 50 1 0 1 1 0 8 0 amappl9 144 265 0 265 1 1 0 1 0 8 0 amappl8 136 107 0 105 1 0 1 1 0 8 0 amappl7 128 152 0 139 1 0 1 1 0 8 0 amappl6 120 178 0 177 1 0 1 1 0 8 0 amappl5 112 101 0 91 1 0 1 1 0 8 0 amappl4 104 319 0 296 1 0 1 1 0 8 0 amappl3 96 4966 0 4845 4 0 4 4 0 8 0 amappl2 88 559 0 496 2 0 2 2 0 8 0 amappl1 80 12035 0 11422 17 3 14 17 0 8 0 amappl 88 7012 0 6840 6 1 5 5 0 92 0 uvmvnodes 80 117 0 0 3 0 3 3 0 8 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 7 0 7 2 2 0 1 0 8 0 dma128 128 254 0 254 2 1 1 1 0 8 1 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 21 0 1 1 0 1 1 0 8 0 uaddrrnd 24 955 0 923 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 955 0 923 1 0 1 1 0 8 0 vmmpekpl 168 9455 0 9406 3 0 3 3 0 8 0 vmmpepl 168 67140 0 65160 99 10 89 97 0 357 1 vmsppl 488 954 0 923 6 1 5 5 0 8 1 rwobjpl 80 20711 0 19623 26 2 24 26 0 8 0 pdppl 4096 1921 0 1848 105 31 74 83 0 8 1 pvpl 32 13178 0 0 107 0 107 107 0 265 0 pmappl 256 956 0 923 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 404 0 54 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(ffffffff83451c58) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348ceed,ffffffff8349b4e7,3bb,ffffffff834c44a6) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c4274e8,ffffffff83445af9) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(285b9a,ffff80003c4274e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff8000fffe3250) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c422530) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806112d980,41,fffffd80097fd2d8,ffff8000fffe3250) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c6ab0e0,ffff8000fffe3250) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c6ab0e0,ffff8000fffe3250) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c6ab0e0,ffff8000fffe3250) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd806c6ab0e0,ffff8000fffe3250) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff8000fffe3250) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff8000fffe3250,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffe3250,ffff80003c4228a0,ffff80003c4227f0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c4228a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4228a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75382282dd10, count: -16 ddb{0}> machine ddbcpu 1