panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_synch.c", line 951 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8343358c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833e2339,ffffffff83331fbf,3b7,ffffffff833eaac3) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c9d65f0,ffffffff8332e45f) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff80003c9d65e8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80003a544cf8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c969aa0) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8063a63b58,1,fffffd8007bfb340,ffff80003a544cf8) at VOP_CLOSE+0x12a sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ace5d30,ffff80003a544cf8) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ace5d30,ffff80003a544cf8) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 fdrop(fffffd806ace5d30,ffff80003a544cf8) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806ace5d30,ffff80003a544cf8) at closef+0x190 sys/kern/kern_descrip.c:1251 fdfree(ffff80003a544cf8) at fdfree+0x115 sys/kern/kern_descrip.c:1182 exit1(ffff80003a544cf8,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003a544cf8,ffff80003c969e10,ffff80003c969d60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c969e00, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_synch.c", line 951 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8343358c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833e2339,ffffffff83331fbf,3b7,ffffffff833eaac3) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c9d65f0,ffffffff8332e45f) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff80003c9d65e8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80003a544cf8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c969aa0) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8063a63b58,1,fffffd8007bfb340,ffff80003a544cf8) at VOP_CLOSE+0x12a sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ace5d30,ffff80003a544cf8) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ace5d30,ffff80003a544cf8) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 fdrop(fffffd806ace5d30,ffff80003a544cf8) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806ace5d30,ffff80003a544cf8) at closef+0x190 sys/kern/kern_descrip.c:1251 fdfree(ffff80003a544cf8) at fdfree+0x115 sys/kern/kern_descrip.c:1182 exit1(ffff80003a544cf8,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003a544cf8,ffff80003c969e10,ffff80003c969d60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c969e10) at syscall+0x97e mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c969e10) at syscall+0x97e sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f1f07d0a510, count: -16 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80003c969880 rbx 0xffffffff81f7d700 pppxclose rdx 0 rcx 0 rax 0xffff80003a544cf8 r8 0 r9 0x8080808080808080 r10 0xf400000ab3dc4c82 r11 0xabf678d734c51640 r12 0 r13 0 r14 0 r15 0x1 rip 0xffffffff83013255 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c969870 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=108052 pid=79269 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003a544cf8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a880a78,0xffff80002a8819e8 process=0xffff80002a879b68 user=0xffff80003c964000, vmspace=0xfffffd806ba9da20 estcpu=36, cpticks=3, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 50005 17813 74286 0 2 0xc80 syz-executor 50005 246353 74286 0 3 0x4000000 smrbar syz-executor 83285 174076 2968 0 2 0x4000000 syz-executor 83285 175206 2968 0 3 0x4000080 fsleep syz-executor 80242 293348 96943 0 3 0x80 nanoslp syz-executor 80242 306396 96943 0 3 0x4000080 sbwait syz-executor 80242 25388 96943 0 3 0x4000080 fsleep syz-executor 63124 452255 0 0 3 0x14280 nfsidl nfsio 26113 84546 0 0 3 0x14280 nfsidl nfsio 42354 347795 0 0 3 0x14280 nfsidl nfsio 33184 500059 0 0 3 0x14280 nfsidl nfsio 43355 240036 0 0 3 0x14280 nfsidl nfsio 44424 93436 0 0 3 0x14280 nfsidl nfsio 90118 334078 0 0 3 0x14280 nfsidl nfsio 48703 335373 0 0 3 0x14280 nfsidl nfsio 2733 133013 0 0 3 0x14280 nfsidl nfsio 9536 5617 0 0 3 0x14280 nfsidl nfsio 2098 183981 0 0 3 0x14280 nfsidl nfsio 40336 260434 0 0 3 0x14280 nfsidl nfsio 55362 93560 0 0 3 0x14280 nfsidl nfsio 20699 367712 0 0 3 0x14280 nfsidl nfsio 92029 318744 0 0 3 0x14280 nfsidl nfsio 13569 189031 0 0 3 0x14280 nfsidl nfsio 69304 55909 0 0 3 0x14280 nfsidl nfsio 65190 370321 0 0 3 0x14280 nfsidl nfsio 21352 19732 0 0 3 0x14280 nfsidl nfsio 5072 435040 0 0 3 0x14280 nfsidl nfsio 2968 131380 29970 0 2 0xc82 syz-executor 25791 6386 0 0 3 0x14200 bored sosplice 96943 196665 29970 0 2 0xc82 syz-executor 92803 376002 29970 0 2 0x2 syz-executor 22191 406294 29970 0 3 0x82 nanoslp syz-executor 2655 134099 29970 0 3 0x82 nanoslp syz-executor 74286 84184 29970 0 3 0x82 nanoslp syz-executor 18835 436820 29970 0 2 0x2 syz-executor 42723 188129 29970 0 3 0x82 nanoslp syz-executor 29970 146685 31298 0 3 0x82 kqread syz-executor 31298 436224 19531 0 3 0x10008a sigsusp ksh 19531 480224 53015 0 3 0x98 kqread sshd-session 53015 242019 3630 0 3 0x92 kqread sshd-session 61734 423401 1 0 3 0x100083 ttyopn getty 3630 418972 1 0 3 0x88 kqread sshd 84896 149686 78533 73 3 0x1100090 kqread syslogd 78533 509830 1 0 3 0x100082 sbwait syslogd 7581 246536 1 0 3 0x100080 kqread resolvd 30925 286824 45699 77 3 0x100092 kqread dhcpleased 87192 222834 45699 77 3 0x100092 kqread dhcpleased 45699 85914 1 0 3 0x80 kqread dhcpleased 66293 204950 0 0 3 0x14200 bored smr 99826 167260 0 0 2 0x14200 zerothread 82205 474644 0 0 3 0x14200 aiodoned aiodoned 23307 283916 0 0 3 0x14200 syncer update 16121 499375 0 0 3 0x14200 cleaner cleaner 52610 447830 0 0 3 0x14200 reaper reaper 12498 360390 0 0 3 0x14200 pgdaemon pagedaemon 69140 206060 0 0 3 0x14200 bored viomb 2090 413162 0 0 3 0x40014200 acpi0 acpi0 59087 185374 0 0 3 0x14200 bored softnet7 85746 194729 0 0 3 0x14200 bored softnet6 37367 77240 0 0 3 0x14200 bored softnet5 29010 200702 0 0 3 0x14200 bored softnet4 23119 116351 0 0 3 0x14200 bored softnet3 18948 353801 0 0 3 0x14200 bored softnet2 58465 161886 0 0 3 0x14200 bored softnet1 43027 382506 0 0 3 0x14200 bored softnet0 64607 200016 0 0 3 0x14200 bored systqmp 78144 520852 0 0 3 0x14200 bored systq 41602 272737 0 0 2 0x40014200 softclock 23980 422665 0 0 3 0x40014200 idle0 1 151219 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10196 11185K 12186K 166960K 13502 0 pcb 18 15K 17K 166960K 222 0 rtable 195 7K 7K 166960K 394 0 pf 35 14K 19K 166960K 405 0 ifaddr 38 6K 7K 166960K 87 0 ifgroup 53 2K 2K 166960K 136 0 sysctl 4 1K 9K 166960K 12 0 counters 35 18K 18K 166960K 106 0 ioctlops 0 0K 4K 166960K 295 0 iov 0 0K 28K 166960K 49 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1468 92K 93K 166960K 2513 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 10K 10K 166960K 16 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 31 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 240K 166960K 915 0 sigio 0 0K 0K 166960K 12 0 proc 60 59K 124K 166960K 568 0 subproc 72 4K 4K 166960K 83 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 151 0 in_multi 77 5K 6K 166960K 131 0 ether_multi 1 0K 0K 166960K 6 0 mrt 2 0K 0K 166960K 8 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 537 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 212 151K 164K 166960K 9276 0 UVM aobj 28 2K 4K 166960K 30 0 pinsyscall 37 74K 96K 166960K 1970 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 52 0 NDP 12 0K 1K 166960K 58 0 temp 63 8672K 8737K 166960K 23005 0 kqueue 14 22K 32K 166960K 158 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 222 0 219 3 2 1 2 0 8 0 rtentry 136 144 0 62 4 0 4 4 0 8 0 unpcb 144 631 0 613 6 4 2 4 0 8 1 syncache 336 7 0 7 3 2 1 1 0 8 1 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 415 0 409 17 10 7 10 0 8 6 arp 88 18 0 8 1 0 1 1 0 8 0 ipq 40 4 0 1 1 0 1 1 0 8 0 ipqe 40 8 0 5 1 0 1 1 0 8 0 inpcb 328 1331 0 1320 23 13 10 10 0 8 8 ip6q 72 4 0 2 1 0 1 1 0 8 0 ip6af 40 6 0 4 1 0 1 1 0 8 0 nd6 104 27 0 6 1 0 1 1 0 8 0 pkpcb 40 12 0 12 5 4 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1072 62 0 59 3 2 1 1 0 8 0 pppxif 1384 37 0 35 3 2 1 1 0 8 0 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pfosfp 40 2 0 1 1 0 1 1 0 8 0 pfosfpen 112 2 0 1 1 0 1 1 0 8 0 pftag 88 1 0 1 1 1 0 1 0 8 0 pfstkey 128 4 0 4 2 2 0 1 0 8 0 pfstate 384 2 0 2 2 2 0 1 0 8 0 pfrule 1344 9 0 9 4 3 1 1 0 8 1 rttmr 136 2 0 1 2 1 1 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 662 0 256 32 5 27 29 0 8 1 art_table 40 664 0 256 5 0 5 5 0 8 0 art_node 32 141 0 71 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 6 1 0 1 1 0 8 0 semapl 112 27 0 17 1 0 1 1 0 8 0 shmpl 112 27 0 2 1 0 1 1 0 8 0 dirhash 1024 28 0 11 3 0 3 3 0 8 0 dino2pl 256 3076 0 1582 95 0 95 95 0 8 0 ffsino 256 3076 0 1582 95 0 95 95 0 8 0 nchpl 144 4307 0 2623 63 0 63 63 0 8 0 rtmask 32 6 0 6 3 2 1 1 0 8 1 uvmvnodes 80 3660 0 0 75 0 75 75 0 8 0 vnodes 216 3660 0 0 204 0 204 204 0 8 0 namei 1024 15471 0 15471 5 4 1 2 0 8 1 kstatmem 264 80 0 56 2 0 2 2 0 8 0 scsiplug 72 2 0 2 2 1 1 1 0 8 1 scxspl 216 17076 0 17076 15 7 8 8 1 8 8 plimitpl 152 147 0 129 1 0 1 1 0 8 0 sigapl 424 1209 0 1140 9 1 8 8 0 8 0 knotepl 120 33973 0 33924 37 27 10 23 0 8 7 kqueuepl 184 413 0 402 4 0 4 4 0 8 2 pipepl 304 382 0 355 10 2 8 8 0 8 5 fdescpl 448 1165 0 1137 5 1 4 5 0 8 0 filepl 120 8244 0 8019 20 6 14 14 0 8 5 lockfpl 104 662 0 658 3 1 2 2 0 8 1 lockfspl 48 284 0 280 1 0 1 1 0 8 0 sessionpl 144 26 0 18 1 0 1 1 0 8 0 pgrppl 48 79 0 63 1 0 1 1 0 8 0 ucredpl 104 1093 0 1082 1 0 1 1 0 8 0 zombiepl 144 1143 0 1140 1 0 1 1 0 8 0 processpl 1168 1209 0 1140 7 1 6 6 0 8 0 procpl 656 2367 0 2294 8 0 8 8 0 8 0 sosppl 168 3 0 3 2 2 0 1 0 8 0 sockpl 552 2223 0 2191 19 9 10 10 0 8 7 mcl64k 65536 82 0 81 5 4 1 1 0 8 0 mcl16k 16384 1 0 1 1 1 0 1 0 8 0 mcl9k 9216 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 23 0 23 4 3 1 1 0 8 1 mcl4k 4096 3477 0 3434 13 6 7 10 0 8 1 mcl2k2 2112 1 0 1 1 1 0 1 0 8 0 mcl2k 2048 1445 0 1435 6 3 3 3 0 8 1 mtagpl 96 47 0 15 1 0 1 1 0 8 0 mbufpl 256 13098 0 12914 26 7 19 19 0 8 5 bufpl 280 6149 0 130 430 0 430 430 0 8 0 anonpl 24 130788 0 127614 62 17 45 46 0 187 9 amapchunkpl 152 29667 0 29235 39 10 29 29 0 158 7 amappl16 200 1668 0 1634 24 11 13 15 0 8 8 amappl14 184 108 0 98 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 1788 0 1760 3 1 2 3 0 8 0 amappl11 160 51 0 41 1 0 1 1 0 8 0 amappl10 152 1 0 1 1 1 0 1 0 8 0 amappl9 144 234 0 234 1 1 0 1 0 8 0 amappl8 136 61 0 60 1 0 1 1 0 8 0 amappl7 128 110 0 99 1 0 1 1 0 8 0 amappl6 120 177 0 173 1 0 1 1 0 8 0 amappl5 112 116 0 109 1 0 1 1 0 8 0 amappl4 104 275 0 258 1 0 1 1 0 8 0 amappl3 96 6215 0 6115 4 0 4 4 0 8 0 amappl2 88 649 0 592 2 0 2 2 0 8 0 amappl1 80 12127 0 11582 16 2 14 14 0 8 0 amappl 88 8461 0 8313 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 0 1 1 0 8 1 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 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 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 7 0 7 2 1 1 1 0 8 1 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 29 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1165 0 1137 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1165 0 1137 1 0 1 1 0 8 0 vmmpekpl 168 11170 0 11130 3 0 3 3 0 8 1 vmmpepl 168 76484 0 74670 102 6 96 96 0 357 9 vmsppl 368 1164 0 1137 4 1 3 4 0 8 0 rwobjpl 40 23766 0 19238 47 0 47 47 0 8 0 pdppl 4096 2336 0 2274 110 44 66 82 0 8 4 pvpl 32 454090 0 445358 149 32 117 121 0 265 18 pmappl 216 1164 0 1137 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 439 0 96 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8343358c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833e2339,ffffffff83331fbf,3b7,ffffffff833eaac3) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c9d65f0,ffffffff8332e45f) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff80003c9d65e8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80003a544cf8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c969aa0) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8063a63b58,1,fffffd8007bfb340,ffff80003a544cf8) at VOP_CLOSE+0x12a sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ace5d30,ffff80003a544cf8) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ace5d30,ffff80003a544cf8) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 fdrop(fffffd806ace5d30,ffff80003a544cf8) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806ace5d30,ffff80003a544cf8) at closef+0x190 sys/kern/kern_descrip.c:1251 fdfree(ffff80003a544cf8) at fdfree+0x115 sys/kern/kern_descrip.c:1182 exit1(ffff80003a544cf8,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003a544cf8,ffff80003c969e10,ffff80003c969d60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c969e10) at syscall+0x97e mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c969e10) at syscall+0x97e sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f1f07d0a510, count: -16 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8343358c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833e2339,ffffffff83331fbf,3b7,ffffffff833eaac3) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c9d65f0,ffffffff8332e45f) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff80003c9d65e8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80003a544cf8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c969aa0) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8063a63b58,1,fffffd8007bfb340,ffff80003a544cf8) at VOP_CLOSE+0x12a sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ace5d30,ffff80003a544cf8) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ace5d30,ffff80003a544cf8) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 fdrop(fffffd806ace5d30,ffff80003a544cf8) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806ace5d30,ffff80003a544cf8) at closef+0x190 sys/kern/kern_descrip.c:1251 fdfree(ffff80003a544cf8) at fdfree+0x115 sys/kern/kern_descrip.c:1182 exit1(ffff80003a544cf8,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003a544cf8,ffff80003c969e10,ffff80003c969d60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c969e10) at syscall+0x97e mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c969e10) at syscall+0x97e sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f1f07d0a510, count: -16