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 379193 84289 0 0x2000 0x4080000 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b6508) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f0f73,ffffffff8340279b,3bb,ffffffff8342cd88) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c42dd68,ffffffff833a4d9a) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(2a5b9a,ffff80003c42dd60) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(2a5b9a,41,2000,ffff80003c446558) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c475740) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e010048,41,fffffd80097fd2d8,ffff80003c446558) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806a62f398,ffff80003c446558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806a62f398,ffff80003c446558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806a62f398,ffff80003c446558) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806a62f398,ffff80003c446558) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c446558) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c446558,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c446558,ffff80003c475ab0,ffff80003c475a00) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c475aa0, 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(ffffffff833b6508) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f0f73,ffffffff8340279b,3bb,ffffffff8342cd88) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c42dd68,ffffffff833a4d9a) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(2a5b9a,ffff80003c42dd60) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(2a5b9a,41,2000,ffff80003c446558) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c475740) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e010048,41,fffffd80097fd2d8,ffff80003c446558) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806a62f398,ffff80003c446558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806a62f398,ffff80003c446558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806a62f398,ffff80003c446558) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806a62f398,ffff80003c446558) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c446558) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c446558,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c446558,ffff80003c475ab0,ffff80003c475a00) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c475ab0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c475ab0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77197abe0bc0, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c475510 rbx 0xffffffff83807e07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff80003c446558 rax 0xffffffff83806ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x31ac08481d3fac95 r11 0x75be0f12d0242847 r12 0xffffffff83807c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff81852d35 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c475500 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=107911 pid=88184 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=82, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c446558 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000fffe7ca8,0xffff8000fffe74f0 process=0xffff8000fffe9cf8 user=0xffff80003c470000, vmspace=0xfffffd806c963200 estcpu=32, cpticks=7, pctcpu=0.6, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 16229 5989 14057 0 2 0xc80 syz-executor 16229 408069 14057 0 3 0x4000080 fsleep syz-executor 16229 140026 14057 0 3 0x4000080 fsleep syz-executor 16229 156177 14057 0 3 0x4000080 fsleep syz-executor 98292 28539 16450 0 2 0 syz-executor 98292 109492 16450 0 2 0x4000000 syz-executor 34246 318548 11450 0 2 0xc80 syz-executor 34246 433765 11450 0 3 0x4000080 kqread syz-executor 34246 301078 11450 0 3 0x4000000 smrbar syz-executor 34246 103629 11450 0 3 0x4000080 fsleep syz-executor 11945 97307 30362 0 3 0x80 nanoslp syz-executor 11945 267706 30362 0 3 0x4000080 kqsel syz-executor 11945 100266 30362 0 3 0x4000080 fsleep syz-executor 3513 399315 12369 60928 3 0x90 nanoslp syz-executor 3513 314070 12369 60928 3 0x4000090 kqsel syz-executor 3513 316228 12369 60928 3 0x4000090 fsleep syz-executor 84289 377031 11072 0 4 0x82000 syz-executor 84289 379193 11072 0 7 0x4082000 syz-executor 84289 239274 11072 0 3 0x4082000 inode syz-executor 84289 134420 11072 0 3 0x4082000 inode syz-executor 84289 46872 11072 0 3 0x4082000 inode syz-executor 84289 174011 11072 0 3 0x4082000 inode syz-executor 84289 323342 11072 0 3 0x4082000 inode syz-executor 84289 451224 11072 0 3 0x4002000 suspend syz-executor 30362 42668 70338 0 3 0x82 nanoslp syz-executor 12369 278053 70338 0 3 0x82 nanoslp syz-executor 16450 334924 70338 0 3 0x82 nanoslp syz-executor 11450 80580 70338 0 3 0x82 nanoslp syz-executor 55946 424846 70338 0 3 0x82 nanoslp syz-executor 14057 471349 70338 0 2 0xc82 syz-executor 11072 486335 70338 0 3 0x82 wait syz-executor 48305 187650 70338 0 3 0x82 nanoslp syz-executor 70338 132772 76260 0 3 0x82 kqread syz-executor 76260 269903 92935 0 3 0x10008a sigsusp ksh 92935 428872 18757 0 3 0x98 kqread sshd-session 18757 302926 32414 0 3 0x92 kqread sshd-session 52655 287923 1 0 3 0x100083 ttyin getty 32414 226588 1 0 3 0x88 kqread sshd 43059 256756 98427 74 3 0x1100092 bpf pflogd 98427 153220 1 0 3 0x80 sbwait pflogd 21664 15673 70639 73 3 0x1100090 kqread syslogd 70639 364413 1 0 3 0x100082 sbwait syslogd 67135 516282 1 0 3 0x100080 kqread resolvd 98421 349527 9228 77 3 0x100092 kqread dhcpleased 19495 407166 9228 77 3 0x100092 kqread dhcpleased 9228 459243 1 0 3 0x80 kqread dhcpleased 87401 190638 0 0 3 0x14200 bored smr 64003 297727 0 0 3 0x14200 pgzero zerothread 31269 129523 0 0 3 0x14200 aiodoned aiodoned 22164 108342 0 0 3 0x14200 syncer update 9017 271854 0 0 3 0x14200 cleaner cleaner 88862 57544 0 0 3 0x14200 reaper reaper 68169 332412 0 0 3 0x14200 pgdaemon pagedaemon 5187 487470 0 0 3 0x14200 bored viomb 48942 503956 0 0 3 0x40014200 acpi0 acpi0 21912 144405 0 0 3 0x40014200 idle1 22445 78387 0 0 3 0x14200 bored softnet1 99175 45832 0 0 3 0x14200 bored softnet0 35593 425430 0 0 3 0x14200 bored systqmp 62103 119308 0 0 3 0x14200 bored systq 36846 450595 0 0 3 0x14200 tmoslp softclockmp 58166 370248 0 0 3 0x40014200 tmoslp softclock 63398 295200 0 0 3 0x40014200 idle0 1 373502 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 98292 (syz-executor) thread 0xffff80003c447a18 (109492) exclusive rrwlock inode r = 0 (0xfffffd8070b22330) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 84289 (syz-executor) thread 0xffff8000fffe7248 (379193) exclusive rrwlock inode r = 0 (0xfffffd806e78cb80) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 84289 (syz-executor) thread 0xffff8000fffe6fb0 (239274) exclusive rrwlock inode r = 0 (0xfffffd806e984c30) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11084 12174K 13020K 166960K 12861 0 pcb 19 14K 16K 166960K 225 0 rtable 247 10K 11K 166960K 425 0 pf 39 18K 21K 166960K 100 0 ifaddr 47 8K 9K 166960K 78 0 ifgroup 61 2K 2K 166960K 115 0 sysctl 3 1K 9K 166960K 7 0 counters 78 37K 38K 166960K 136 0 ioctlops 0 0K 4K 166960K 1553 0 iov 0 0K 16K 166960K 42 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1434 90K 90K 166960K 1831 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 11 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 21 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 89K 166960K 580 0 sigio 0 0K 0K 166960K 15 0 proc 78 147K 164K 166960K 608 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 62 0 in_multi 100 7K 7K 166960K 119 0 ether_multi 1 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 434 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 291 165K 177K 166960K 7204 0 UVM aobj 10 2K 2K 166960K 10 0 pinsyscall 43 86K 105K 166960K 1722 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 37 0 NDP 14 0K 2K 166960K 50 0 temp 83 8688K 8754K 166960K 32487 0 kqueue 17 28K 30K 166960K 134 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 68 0 64 1 0 1 1 0 8 0 rtentry 176 128 0 22 6 0 6 6 0 8 0 unpcb 144 414 0 397 5 1 4 4 0 8 3 syncache 336 8 0 8 1 0 1 1 0 8 1 tcpqe 32 2 0 2 1 0 1 1 0 8 1 tcpcb 736 293 0 286 13 5 8 13 0 8 7 arp 136 20 0 1 1 0 1 1 0 8 0 inpcb 328 748 0 736 12 3 9 12 0 8 7 nd6 152 27 0 0 2 0 2 2 0 8 0 pkpcb 40 4 0 4 2 1 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 27 0 25 1 0 1 1 0 8 0 pppxif 1504 4 0 2 1 0 1 1 0 8 0 pfstscr 40 1 0 1 1 0 1 1 0 8 1 pffrag 232 3 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 5 0 2 2 1 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 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pfstkey 128 2 0 2 1 0 1 1 0 8 1 pfstate 448 1 0 1 1 0 1 1 0 8 1 pfrule 1360 3 0 3 1 1 0 1 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 556 0 80 32 2 30 31 0 8 0 art_table 40 558 0 80 5 0 5 5 0 8 0 art_node 32 128 0 33 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semapl 112 17 0 7 1 0 1 1 0 8 0 shmpl 112 7 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2494 0 978 96 0 96 96 0 8 0 ffsino 296 2494 0 978 118 0 118 118 0 8 0 nchpl 144 3332 0 1619 64 0 64 64 0 8 0 rtmask 32 3 0 3 1 1 0 1 0 8 0 vnodes 216 2833 0 0 158 0 158 158 0 8 0 namei 1024 11138 0 11133 3 1 2 2 0 8 1 percpumem 16 83 0 29 1 0 1 1 0 8 0 kstatmem 264 70 0 40 3 0 3 3 0 8 1 scsiplug 72 2 0 2 1 1 0 1 0 8 0 scxspl 216 14009 0 14009 10 8 2 8 1 8 2 plimitpl 152 114 0 96 1 0 1 1 0 8 0 sigapl 424 892 0 844 7 1 6 7 0 8 0 knotepl 120 532 0 0 17 0 17 17 0 8 0 kqueuepl 224 214 0 197 4 1 3 3 0 8 1 pipepl 344 288 0 260 9 2 7 9 0 8 4 fdescpl 528 876 0 844 3 0 3 3 0 8 0 filepl 160 5426 0 5195 21 4 17 21 0 8 6 lockfpl 104 319 0 317 2 1 1 2 0 8 0 lockfspl 48 85 0 83 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 43 0 26 1 0 1 1 0 8 0 ucredpl 104 653 0 639 1 0 1 1 0 8 0 zombiepl 144 846 0 844 1 0 1 1 0 8 0 processpl 1232 892 0 844 5 1 4 5 0 8 0 procpl 664 1684 0 1618 6 0 6 6 0 8 0 sosppl 176 7 0 7 2 1 1 1 0 8 1 sockpl 752 1306 0 1272 17 6 11 17 0 8 7 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 130 0 0 17 0 17 17 0 8 0 mcl2k 2048 21 0 0 3 0 3 3 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 171 0 0 11 0 11 11 0 8 0 bufpl 280 5077 0 127 354 0 354 354 0 8 0 anonpl 32 11525 0 0 93 0 93 93 0 246 0 amapchunkpl 152 23584 0 22819 39 4 35 35 0 158 0 amappl16 200 3300 0 3038 24 10 14 16 0 8 0 amappl15 192 5 0 4 1 0 1 1 0 8 0 amappl14 184 4 0 4 1 1 0 1 0 8 0 amappl13 176 426 0 425 1 0 1 1 0 8 0 amappl12 168 1242 0 1199 3 0 3 3 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 51 0 37 1 0 1 1 0 8 0 amappl9 144 249 0 249 1 1 0 1 0 8 0 amappl8 136 62 0 59 1 0 1 1 0 8 0 amappl7 128 79 0 78 1 0 1 1 0 8 0 amappl6 120 300 0 287 1 0 1 1 0 8 0 amappl5 112 80 0 70 1 0 1 1 0 8 0 amappl4 104 434 0 403 1 0 1 1 0 8 0 amappl3 96 3972 0 3856 4 1 3 3 0 8 0 amappl2 88 1012 0 934 2 0 2 2 0 8 0 amappl1 80 11670 0 11070 14 0 14 14 0 8 1 amappl 88 6397 0 6188 5 0 5 5 0 92 0 uvmvnodes 80 122 0 0 3 0 3 3 0 8 0 dma32768 32768 1 0 1 1 1 0 1 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 9 0 0 1 0 1 1 0 8 0 uaddrrnd 24 877 0 845 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 877 0 845 1 0 1 1 0 8 0 vmmpekpl 168 9474 0 9432 3 1 2 3 0 8 0 vmmpepl 168 63562 0 61282 104 4 100 100 0 357 0 vmsppl 488 876 0 845 6 1 5 5 0 8 1 rwobjpl 80 20334 0 18977 29 1 28 28 0 8 0 pdppl 4096 1761 0 1690 99 26 73 85 0 8 2 pvpl 32 17001 0 0 138 1 137 137 0 265 0 pmappl 256 876 0 845 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 292 0 39 8 0 8 8 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(ffffffff833b6508) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f0f73,ffffffff8340279b,3bb,ffffffff8342cd88) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c42dd68,ffffffff833a4d9a) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(2a5b9a,ffff80003c42dd60) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(2a5b9a,41,2000,ffff80003c446558) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c475740) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e010048,41,fffffd80097fd2d8,ffff80003c446558) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806a62f398,ffff80003c446558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806a62f398,ffff80003c446558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806a62f398,ffff80003c446558) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806a62f398,ffff80003c446558) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c446558) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c446558,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c446558,ffff80003c475ab0,ffff80003c475a00) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c475ab0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c475ab0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77197abe0bc0, 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(ffffffff839d5940) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839d5940) at __mp_lock+0x199 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff839d5940,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 biowait(fffffd806840c490) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd806840c490) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ffs2_balloc(fffffd806e78cae0,de0000,4000,fffffd80097fd2d8,2,ffff80003c416148) at ffs2_balloc+0x18b4 sys/ufs/ffs/ffs_balloc.c:701 ffs_write(ffff80003c4161d0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd806a78e960,ffff80003c416388,7,fffffd80097fd2d8) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd8067c4ada0,ffff80003c416388,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff8000fffe7248,4,ffff80003c416388,0,ffff80003c416440) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_write(ffff8000fffe7248,ffff80003c4164f0,ffff80003c416440) at sys_write+0xa2 sys/kern/sys_generic.c:300 end trace frame: 0xffff80003c4164e0, count: 0 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(ffffffff839d5940) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839d5940) at __mp_lock+0x199 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff839d5940,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 biowait(fffffd806840c490) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd806840c490) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ffs2_balloc(fffffd806e78cae0,de0000,4000,fffffd80097fd2d8,2,ffff80003c416148) at ffs2_balloc+0x18b4 sys/ufs/ffs/ffs_balloc.c:701 ffs_write(ffff80003c4161d0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd806a78e960,ffff80003c416388,7,fffffd80097fd2d8) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd8067c4ada0,ffff80003c416388,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff8000fffe7248,4,ffff80003c416388,0,ffff80003c416440) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_write(ffff8000fffe7248,ffff80003c4164f0,ffff80003c416440) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80003c4164f0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4164f0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x605da77cf00, count: -16