panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 959 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 495431 11115 0 0 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b8742) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f8803,ffffffff8350a2d8,3bf,ffffffff83532f89) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a286b20,ffffffff834b3e8d) at refcnt_finalize+0x1e7 sys/kern/kern_synch.c:960 pppx_if_destroy(205b9a,ffff80002a286b18) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff800045fe9a10) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800037b9aba0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffb005fa27498,1,fffffb00097fd138,ffff800045fe9a10) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffb0070696640,ffff800045fe9a10) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffb0070696640,ffff800045fe9a10) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffb0070696640,ffff800045fe9a10) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffb0070696640,ffff800045fe9a10) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff800045fe9a10) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff800045fe9a10,0,0,1) at exit1+0x595 sys/kern/kern_exit.c:215 sys_exit(ffff800045fe9a10,ffff800037b9af10,ffff800037b9ae60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff800037b9af00, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 959 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b8742) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f8803,ffffffff8350a2d8,3bf,ffffffff83532f89) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a286b20,ffffffff834b3e8d) at refcnt_finalize+0x1e7 sys/kern/kern_synch.c:960 pppx_if_destroy(205b9a,ffff80002a286b18) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff800045fe9a10) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800037b9aba0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffb005fa27498,1,fffffb00097fd138,ffff800045fe9a10) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffb0070696640,ffff800045fe9a10) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffb0070696640,ffff800045fe9a10) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffb0070696640,ffff800045fe9a10) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffb0070696640,ffff800045fe9a10) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff800045fe9a10) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff800045fe9a10,0,0,1) at exit1+0x595 sys/kern/kern_exit.c:215 sys_exit(ffff800045fe9a10,ffff800037b9af10,ffff800037b9ae60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800037b9af10) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800037b9af10) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7896ae2cf400, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800037b9a960 rbx 0xffff80002999ee07 rdx 0 rcx 0xffff800045fe9a10 rax 0xffff80002999dff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x563def0ddd7dae31 r11 0x9f678d75c362a1de r12 0xffff80002999ec08 r13 0 r14 0 r15 0x1 rip 0xffffffff81af0aa5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800037b9a950 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=333124 pid=10914 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=65, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff800045fe9a10 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a2262b0,0xffff80002a226028 process=0xffff800045fee1c8 user=0xffff800037b95000, vmspace=0xfffffb006f9d8b78 estcpu=15, cpticks=15, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 14491 380685 63910 0 2 0 syz-executor 14491 221821 63910 0 3 0x4000080 fsleep syz-executor 14491 126461 63910 0 2 0x4000000 syz-executor 14491 382463 63910 0 3 0x4000080 fsleep syz-executor 1320 422212 25950 0 2 0 syz-executor 11415 345162 10311 0 2 0 syz-executor 11415 33538 10311 0 3 0x4000080 fsleep syz-executor 11115 495431 54739 0 7 0 syz-executor 11115 318666 54739 0 3 0x4000000 smrbar syz-executor 11992 25101 69446 0 2 0 syz-executor 99801 236278 93945 0 2 0 syz-executor 99801 378979 93945 0 3 0x4000080 fsleep syz-executor 99801 194315 93945 0 3 0x4000080 fsleep syz-executor 82077 116633 46560 0 3 0x80 nanoslp syz-executor 82077 518916 46560 0 3 0x4000080 sbwait syz-executor 82077 239095 46560 0 3 0x4000080 fsleep syz-executor 82077 393652 46560 0 3 0x4000080 fsleep syz-executor 46497 505684 1 0 3 0x100083 ttyin getty 46560 448548 40047 0 2 0x2 syz-executor 25950 25203 40047 0 3 0x82 nanoslp syz-executor 69446 473164 40047 0 3 0x82 nanoslp syz-executor 18074 215935 40047 0 3 0x82 nanoslp syz-executor 93945 277633 40047 0 3 0x82 nanoslp syz-executor 63910 401650 40047 0 3 0x82 nanoslp syz-executor 54739 412166 40047 0 3 0x82 nanoslp syz-executor 10311 44166 40047 0 3 0x82 nanoslp syz-executor 40047 15767 1 0 3 0x82 kqread syz-executor 99778 489462 0 0 3 0x14200 bored smr 9401 122840 0 0 2 0x14200 zerothread 63493 487030 0 0 3 0x14200 aiodoned aiodoned 65795 315071 0 0 3 0x14200 syncer update 38463 211753 0 0 3 0x14200 cleaner cleaner 40027 121539 0 0 3 0x14200 reaper reaper 39289 444465 0 0 3 0x14200 pgdaemon pagedaemon 93631 218521 0 0 3 0x14200 bored viomb 31544 515744 0 0 3 0x40014200 acpi0 acpi0 64735 229983 0 0 3 0x40014200 idle1 24085 217480 0 0 3 0x14200 bored softnet1 7763 118145 0 0 3 0x14200 bored softnet0 78000 275271 0 0 3 0x14200 smrbar systqmp 96462 160648 0 0 3 0x14200 bored systq 26575 361932 0 0 3 0x14200 tmoslp softclockmp 49399 338726 0 0 3 0x40014200 tmoslp softclock 44476 346186 0 0 3 0x40014200 idle0 1 50057 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 78000 (systqmp) thread 0xffff800045ffe298 (275271) shared rwlock systqmp r = 0 (0xffffffff83940628) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11064 12153K 12283K 166960K 12248 0 pcb 21 12K 12K 166960K 50 0 rtable 233 9K 9K 166960K 385 0 pf 41 19K 82K 166960K 83 0 ifaddr 42 7K 7K 166960K 54 0 ifgroup 60 2K 2K 166960K 73 0 sysctl 3 1K 9K 166960K 7 0 counters 76 37K 37K 166960K 88 0 ioctlops 0 0K 4K 166960K 1511 0 iov 0 0K 12K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1296 82K 82K 166960K 1430 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 20K 24K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 10 0K 0K 166960K 15 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 65K 93K 166960K 248 0 proc 20 33K 180K 166960K 582 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 12 0 in_multi 89 6K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 11 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 55 254K 254K 166960K 55 0 exec 0 0K 1K 166960K 408 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 138 82K 177K 166960K 4059 0 UVM aobj 9 2K 2K 166960K 9 0 pinsyscall 20 40K 104K 166960K 1428 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 1 0 NDP 13 0K 2K 166960K 33 0 temp 40 9119K 9183K 166960K 6823 0 kqueue 1 2K 22K 166960K 46 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 41 0 41 1 0 1 1 0 8 1 rtentry 176 117 0 15 6 0 6 6 0 8 0 unpcb 144 96 0 94 1 0 1 1 0 8 0 syncache 336 7 0 7 1 0 1 1 0 8 1 tcpcb 736 69 0 68 4 0 4 4 0 8 3 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 192 0 185 5 0 5 5 0 8 4 nd6 152 27 0 4 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 6 0 4 1 0 1 1 0 8 0 pppxif 1576 2 0 0 1 0 1 1 0 8 0 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 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 6 0 2 1 0 1 1 0 8 0 pfsrclim 320 1 0 1 1 0 1 1 0 8 1 pfanchor 1288 4 0 3 1 0 1 1 0 8 0 pfstitem 24 29 0 0 1 0 1 1 0 8 0 pfstkey 128 29 0 0 1 0 1 1 0 8 0 pfstate 448 29 0 0 4 0 4 4 0 8 0 pfrule 1360 24 0 18 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 508 0 59 30 0 30 30 0 8 1 art_table 40 509 0 59 5 0 5 5 0 8 0 art_node 32 117 0 23 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semapl 72 11 0 3 1 0 1 1 0 8 0 shmpl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1754 0 280 93 0 93 93 0 8 0 ffsino 296 1754 0 280 114 0 114 114 0 8 0 nchpl 144 2107 0 404 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 1890 0 0 105 0 105 105 0 8 0 namei 1024 6616 0 6616 3 0 3 3 0 8 3 percpumem 16 59 0 6 1 0 1 1 0 8 0 pfiaddrpl 120 2 0 0 1 0 1 1 0 8 0 kstatmem 264 37 0 8 2 0 2 2 0 8 0 scxspl 216 8583 0 8583 4 2 2 2 1 8 2 plimitpl 152 44 0 34 1 0 1 1 0 8 0 sigapl 424 572 0 536 7 0 7 7 0 8 1 knotepl 120 453 0 0 14 0 14 14 0 8 0 kqueuepl 224 59 0 58 1 0 1 1 0 8 0 pipepl 344 134 0 107 3 0 3 3 0 8 0 fdescpl 528 556 0 536 3 0 3 3 0 8 0 filepl 160 2258 0 2091 11 0 11 11 0 8 2 lockfpl 104 73 0 73 1 0 1 1 0 8 1 lockfspl 48 32 0 32 1 0 1 1 0 8 1 sessionpl 144 30 0 27 1 0 1 1 0 8 0 pgrppl 48 40 0 29 1 0 1 1 0 8 0 ucredpl 104 208 0 204 1 0 1 1 0 8 0 zombiepl 144 537 0 536 1 0 1 1 0 8 0 processpl 1232 572 0 536 5 0 5 5 0 8 1 procpl 664 765 0 719 6 0 6 6 0 8 1 sockpl 752 331 0 322 8 0 8 8 0 8 6 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 132 0 0 17 0 17 17 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 17 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 146 0 0 9 0 9 9 0 8 0 bufpl 272 4017 0 105 261 0 261 261 0 8 0 anonpl 32 5451 0 0 44 0 44 44 0 247 0 amapchunkpl 152 12096 0 11718 25 0 25 25 0 158 10 amappl16 200 1223 0 1202 4 2 2 4 0 8 0 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 437 0 437 1 0 1 1 0 8 1 amappl13 176 134 0 132 1 0 1 1 0 8 0 amappl12 168 832 0 814 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 129 0 129 1 0 1 1 0 8 1 amappl9 144 276 0 276 1 1 0 1 0 8 0 amappl8 136 104 0 103 1 0 1 1 0 8 0 amappl7 128 149 0 147 1 0 1 1 0 8 0 amappl6 120 156 0 155 1 0 1 1 0 8 0 amappl5 112 98 0 98 1 0 1 1 0 8 1 amappl4 104 308 0 305 1 0 1 1 0 8 0 amappl3 96 2223 0 2141 4 0 4 4 0 8 1 amappl2 88 556 0 546 2 0 2 2 0 8 0 amappl1 80 11122 0 10997 15 0 15 15 0 8 8 amappl 88 3245 0 3121 5 0 5 5 0 92 0 uvmvnodes 80 105 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 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 8 0 0 1 0 1 1 0 8 0 uaddrrnd 24 556 0 536 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 556 0 536 1 0 1 1 0 8 0 vmmpekpl 168 6483 0 6448 2 0 2 2 0 8 0 vmmpepl 168 44049 0 43157 87 0 87 87 0 357 43 vmsppl 488 555 0 536 5 0 5 5 0 8 1 rwobjpl 80 15318 0 14880 24 0 24 24 0 8 2 pdppl 4096 1119 0 1072 101 52 49 85 0 8 2 pvpl 32 12108 0 0 98 0 98 98 0 265 0 pmappl 256 555 0 536 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 541 0 55 15 0 15 15 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83904ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x788d3cd46470, count: 8 ddb{0}> trace x86_ipi_db(ffffffff83904ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x788d3cd46470, count: -7 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b8742) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f8803,ffffffff8350a2d8,3bf,ffffffff83532f89) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a286b20,ffffffff834b3e8d) at refcnt_finalize+0x1e7 sys/kern/kern_synch.c:960 pppx_if_destroy(205b9a,ffff80002a286b18) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff800045fe9a10) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800037b9aba0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffb005fa27498,1,fffffb00097fd138,ffff800045fe9a10) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffb0070696640,ffff800045fe9a10) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffb0070696640,ffff800045fe9a10) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffb0070696640,ffff800045fe9a10) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffb0070696640,ffff800045fe9a10) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff800045fe9a10) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff800045fe9a10,0,0,1) at exit1+0x595 sys/kern/kern_exit.c:215 sys_exit(ffff800045fe9a10,ffff800037b9af10,ffff800037b9ae60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff800037b9af00, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b8742) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f8803,ffffffff8350a2d8,3bf,ffffffff83532f89) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a286b20,ffffffff834b3e8d) at refcnt_finalize+0x1e7 sys/kern/kern_synch.c:960 pppx_if_destroy(205b9a,ffff80002a286b18) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff800045fe9a10) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800037b9aba0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffb005fa27498,1,fffffb00097fd138,ffff800045fe9a10) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffb0070696640,ffff800045fe9a10) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffb0070696640,ffff800045fe9a10) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffb0070696640,ffff800045fe9a10) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffb0070696640,ffff800045fe9a10) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff800045fe9a10) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff800045fe9a10,0,0,1) at exit1+0x595 sys/kern/kern_exit.c:215 sys_exit(ffff800045fe9a10,ffff800037b9af10,ffff800037b9ae60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800037b9af10) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800037b9af10) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7896ae2cf400, count: -16 ddb{1}>