panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/kasan/kernel/sys/kern/kern_synch.c", line 959 Stopped at db_enter+0x17: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND *484601 36254 0 0 0x4000000 0K syz-executor db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff847d95a0) at panic+0x270 sys/kern/subr_prf.c:198 __assert(ffffffff8481b4e0,ffffffff8481b500,3bf,ffffffff8481bb80) at __assert+0x48 refcnt_finalize(ffff80003bbb3770,ffffffff84be57c0) at refcnt_finalize+0x203 sys/kern/kern_synch.c:960 pppx_if_destroy(3,ffff80003bbb3768) at pppx_if_destroy+0x53 sys/net/if_pppx.c:794 pppxclose(5beb,1,2000,ffff80003a737a28) at pppxclose+0xe4 sys/net/if_pppx.c:541 spec_close(ffff800038f1eda0) at spec_close+0x56b sys/kern/spec_vnops.c:538 VOP_CLOSE(ffff800001b891c0,1,ffff8000001198f0,ffff80003a737a28) at VOP_CLOSE+0x1e9 sys/kern/vfs_vops.c:156 vn_closefile(ffff800001ba4e88,ffff80003a737a28) at vn_closefile+0x1cc vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(ffff800001ba4e88,ffff80003a737a28) at vn_closefile+0x1cc sys/kern/vfs_vnops.c:621 fdrop(ffff800001ba4e88,ffff80003a737a28) at fdrop+0x1c3 sys/kern/kern_descrip.c:1281 closef(ffff800001ba4e88,ffff80003a737a28) at closef+0x263 sys/kern/kern_descrip.c:1265 sys_closefrom(ffff80003a737a28,ffff800038f1f260,ffff800038f1f1c0) at sys_closefrom+0x1bc sys/kern/kern_descrip.c:1471 syscall(ffff800038f1f260) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038f1f260) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8153193c810, count: 1 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/kasan/kernel/sys/kern/kern_synch.c", line 959 ddb{0}> show kasan kasan: no report recorded this boot ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff847d95a0) at panic+0x270 sys/kern/subr_prf.c:198 __assert(ffffffff8481b4e0,ffffffff8481b500,3bf,ffffffff8481bb80) at __assert+0x48 refcnt_finalize(ffff80003bbb3770,ffffffff84be57c0) at refcnt_finalize+0x203 sys/kern/kern_synch.c:960 pppx_if_destroy(3,ffff80003bbb3768) at pppx_if_destroy+0x53 sys/net/if_pppx.c:794 pppxclose(5beb,1,2000,ffff80003a737a28) at pppxclose+0xe4 sys/net/if_pppx.c:541 spec_close(ffff800038f1eda0) at spec_close+0x56b sys/kern/spec_vnops.c:538 VOP_CLOSE(ffff800001b891c0,1,ffff8000001198f0,ffff80003a737a28) at VOP_CLOSE+0x1e9 sys/kern/vfs_vops.c:156 vn_closefile(ffff800001ba4e88,ffff80003a737a28) at vn_closefile+0x1cc vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(ffff800001ba4e88,ffff80003a737a28) at vn_closefile+0x1cc sys/kern/vfs_vnops.c:621 fdrop(ffff800001ba4e88,ffff80003a737a28) at fdrop+0x1c3 sys/kern/kern_descrip.c:1281 closef(ffff800001ba4e88,ffff80003a737a28) at closef+0x263 sys/kern/kern_descrip.c:1265 sys_closefrom(ffff80003a737a28,ffff800038f1f260,ffff800038f1f1c0) at sys_closefrom+0x1bc sys/kern/kern_descrip.c:1471 syscall(ffff800038f1f260) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038f1f260) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8153193c810, count: -14 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800038f1ea70 rbx 0xffff800038f1eae0 rdx 0 rcx 0xffffffff85263ff0 cpu_info_full_primary+0x1ff0 rax 0xffff80000015cf80 r8 0x8 r9 0x1 r10 0x1 r11 0xffffffff81598630 x86_bus_space_io_read_1 r12 0xffffffff847d95a0 .str.2 r13 0xffffffff85264c10 cpu_info_full_primary+0x2c10 r14 0xffffffff85264e0f cpu_info_full_primary+0x2e0f r15 0x1 rip 0xffffffff82914d77 db_enter+0x17 cs 0x8 rflags 0x246 rsp 0xffff800038f1ea70 ss 0x10 db_enter+0x17: popq %rbp ddb{0}> show proc PROC (syz-executor) tid=484601 pid=36254 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=80, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003a736a98,0xffff80003a7377a0 process=0xffff80003bba0eb0 user=0xffff800038f14000, vmspace=0xffff800001bf05d8 estcpu=30, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 58355 104712 49047 0 2 0 0 syz-executor 23332 521442 12765 0 2 0x100000 0 sh 12765 319003 43346 0 3 0x100002 0x88 sigsusp sh 8274 355587 17645 0 2 0 0 syz-executor 8274 13767 17645 0 2 0 0x4000000 syz-executor 8274 402814 17645 0 3 0 0x4000080 fsleep syz-executor 8274 4460 17645 0 3 0 0x4000080 fsleep syz-executor 46315 377601 75913 0 2 0x2000 0x80000 syz-executor 46315 302379 75913 0 3 0x2000 0x4000000 suspend syz-executor 46315 209537 75913 0 2 0x2000 0x4080000 syz-executor 83264 90085 49047 0 2 0x2 0 syz-executor 36254 163499 40194 0 2 0 0 syz-executor *36254 484601 40194 0 7 0 0x4000000 syz-executor 60321 429566 6814 0 2 0 0 syz-executor 60321 296000 6814 0 3 0 0x4000080 fsleep syz-executor 43346 298561 49047 0 3 0x2 0x80 wait syz-executor 75913 68245 49047 0 2 0x2 0xc80 syz-executor 17645 129233 49047 0 2 0x2 0xc80 syz-executor 21141 291532 0 0 3 0x14000 0x280 nfsidl nfsio 28912 236584 0 0 3 0x14000 0x280 nfsidl nfsio 8892 17123 0 0 3 0x14000 0x280 nfsidl nfsio 29740 286476 0 0 3 0x14000 0x280 nfsidl nfsio 4849 273560 0 0 3 0x14000 0x280 nfsidl nfsio 54195 492819 0 0 3 0x14000 0x280 nfsidl nfsio 45500 468545 0 0 3 0x14000 0x280 nfsidl nfsio 79751 49463 0 0 3 0x14000 0x280 nfsidl nfsio 90969 152225 0 0 3 0x14000 0x280 nfsidl nfsio 32234 195837 0 0 3 0x14000 0x280 nfsidl nfsio 53161 366576 0 0 3 0x14000 0x280 nfsidl nfsio 75786 317853 0 0 3 0x14000 0x280 nfsidl nfsio 71573 363434 0 0 3 0x14000 0x280 nfsidl nfsio 20318 53632 0 0 3 0x14000 0x280 nfsidl nfsio 50238 369629 0 0 3 0x14000 0x280 nfsidl nfsio 42683 353903 0 0 3 0x14000 0x280 nfsidl nfsio 8635 312830 0 0 3 0x14000 0x280 nfsidl nfsio 31535 291308 0 0 3 0x14000 0x280 nfsidl nfsio 42699 310656 0 0 3 0x14000 0x280 nfsidl nfsio 13814 240024 0 0 3 0x14000 0x280 nfsidl nfsio 40194 107785 49047 0 2 0x2 0xc80 syz-executor 78760 410325 49047 0 2 0x2 0xc80 syz-executor 6814 442762 49047 0 2 0x2 0 syz-executor 49047 257730 87124 0 2 0x2 0 syz-executor 87124 232697 57037 0 3 0x100002 0x88 sigsusp ksh 57037 252376 36581 0 3 0x10 0x88 kqread sshd-session 36581 267064 43065 0 3 0x12 0x80 kqread sshd-session 37234 159294 1 0 3 0x100003 0x80 ttyin getty 43065 110265 1 0 3 0 0x88 kqread sshd 24588 399242 21561 74 3 0x1100012 0x80 bpf pflogd 21561 101123 1 0 3 0 0x80 sbwait pflogd 62385 96911 72933 73 3 0x1100010 0x80 kqread syslogd 72933 461740 1 0 3 0x100002 0x80 sbwait syslogd 82348 226668 1 0 3 0x100000 0x80 kqread resolvd 56633 183811 15945 77 2 0x100012 0 dhcpleased 85851 462162 15945 77 3 0x100012 0x80 kqread dhcpleased 15945 367115 1 0 3 0 0x80 kqread dhcpleased 60907 107493 0 0 3 0x14000 0x200 bored smr 16425 99902 0 0 2 0x14000 0x200 zerothread 67213 268107 0 0 3 0x14000 0x200 aiodoned aiodoned 72174 189740 0 0 3 0x14000 0x200 syncer update 98175 410544 0 0 3 0x14000 0x200 cleaner cleaner 30940 363360 0 0 3 0x14000 0x200 reaper reaper 71089 341215 0 0 3 0x14000 0x200 pgdaemon pagedaemon 24514 261381 0 0 3 0x14000 0x200 bored viomb 32945 9533 0 0 3 0x14000 0x40000200 acpi0 acpi0 27788 130397 0 0 7 0x14000 0x40000200 idle1 27707 9815 0 0 3 0x14000 0x200 bored softnet1 64022 423077 0 0 2 0x14000 0x200 softnet0 54137 190686 0 0 3 0x14000 0x200 smrbar systqmp 15373 300749 0 0 3 0x14000 0x200 bored systq 27110 398815 0 0 3 0x14000 0x200 tmoslp softclockmp 8501 9169 0 0 3 0x14000 0x40000200 tmoslp softclock 30331 32334 0 0 3 0x14000 0x40000200 idle0 1 199704 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks Process 36254 (syz-executor) thread 0xffff80003a737a28 (484601) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff85440380) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:-1 #2 sleep_finish+0x423 sys/kern/kern_synch.c:369 #3 msleep_nsec+0x2d9 sys/kern/kern_synch.c:219 #4 taskq_do_barrier+0x291 sys/kern/kern_task.c:304 #5 ifiq_destroy+0x116 sys/net/ifq.c:697 #6 if_detach+0xbb7 sys/net/if.c:-1 #7 pppx_if_destroy+0xbc sys/net/if_pppx.c:801 #8 pppxclose+0xe4 sys/net/if_pppx.c:541 #9 spec_close+0x56b sys/kern/spec_vnops.c:538 #10 VOP_CLOSE+0x1e9 sys/kern/vfs_vops.c:156 #11 vn_closefile+0x1cc vn_close sys/kern/vfs_vnops.c:298 [inline] #11 vn_closefile+0x1cc sys/kern/vfs_vnops.c:621 #12 fdrop+0x1c3 sys/kern/kern_descrip.c:1281 #13 closef+0x263 sys/kern/kern_descrip.c:1265 #14 sys_closefrom+0x1bc sys/kern/kern_descrip.c:1471 #15 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #15 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #16 Xsyscall+0x128 Process 64022 (softnet0) thread 0xffff800045ffe530 (423077) shared rwlock softnet0 r = 0 (0xffff80000011f078) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x1ba sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 Process 54137 (systqmp) thread 0xffff800045ffe000 (190686) shared rwlock systqmp r = 0 (0xffffffff84f56798) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x1ba sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11094 12253K 12394K 166960K 12292 0 pcb 18 26K 28K 166960K 50 0 rtable 223 15K 31K 166960K 477 0 pf 40 24K 26K 166960K 80 0 ifaddr 44 12K 15K 166960K 73 0 ifgroup 64 2K 3K 166960K 108 0 sysctl 4 1K 13K 166960K 11 0 counters 78 44K 45K 166960K 98 0 ioctlops 3 2K 185K 166960K 1556 0 iov 0 0K 13K 166960K 8 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1348 87K 87K 166960K 1533 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 10K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 14 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 413K 166960K 11964 0 file desc 19 61K 117K 166960K 332 0 sigio 0 0K 0K 166960K 1 0 proc 102 130K 195K 166960K 689 0 subproc 81 10K 11K 166960K 126 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 ip_moptions 0 0K 0K 166960K 10 0 in_multi 90 6K 8K 166960K 146 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 16 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 55 384K 384K 166960K 55 0 exec 16 4K 18K 166960K 487 0 fusefs mount 1 36K 36K 166960K 1 0 tdb 3 1K 1K 166960K 3 0 VM swap 14 124K 124K 166960K 15 0 UVM amap 351 286K 391K 166960K 4533 0 UVM aobj 7 4K 4K 166960K 7 0 pinsyscall 95 171K 381K 166960K 1632 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 3 0K 0K 166960K 10 0 NDP 16 0K 2K 166960K 48 0 temp 617 9272K 9457K 166960K 7182 0 kqueue 14 41K 84K 166960K 44 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 47 0 44 1 0 1 1 0 8 0 rtentry 176 159 0 82 6 0 6 6 0 8 0 unpcb 144 152 0 135 1 0 1 1 0 8 0 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 736 88 0 84 7 3 4 7 0 8 3 arp 136 27 0 15 1 0 1 1 0 8 0 inpcb 328 283 0 275 7 3 4 7 0 8 3 nd6 152 37 0 22 1 0 1 1 0 8 0 kcovpl 48 14 0 7 1 0 1 1 0 8 0 ppxss 1192 2 0 1 1 0 1 1 0 8 0 pppxif 1576 2 0 1 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 2 0 0 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 pftag 88 2 0 0 1 0 1 1 0 8 0 pfqueue 320 3 0 2 1 0 1 1 0 8 0 pfstitem 24 47 0 4 1 0 1 1 0 8 0 pfstkey 128 47 0 4 2 0 2 2 0 8 0 pfstate 448 47 0 4 6 0 6 6 0 8 0 pfrule 1360 23 0 18 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 640 0 264 29 0 29 29 0 8 1 art_table 40 641 0 264 5 0 5 5 0 8 0 art_node 32 159 0 87 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semapl 72 10 0 0 1 0 1 1 0 8 0 shmpl 120 4 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1788 0 304 93 0 93 93 0 8 0 ffsino 296 1788 0 304 115 0 115 115 0 8 0 nchpl 144 2153 0 425 64 0 64 64 0 8 0 vnodes 216 2009 0 0 112 0 112 112 0 8 0 namei 1024 8270 0 8268 3 2 1 2 0 8 0 percpumem 16 65 0 15 1 0 1 1 0 8 0 kstatmem 264 51 0 28 2 0 2 2 0 8 0 scxspl 216 7996 0 7996 7 4 3 3 1 8 3 plimitpl 152 45 0 28 1 0 1 1 0 8 0 sigapl 424 666 0 599 8 0 8 8 0 8 0 knotepl 120 139 0 0 5 0 5 5 0 8 0 kqueuepl 224 65 0 56 1 0 1 1 0 8 0 pipepl 344 180 0 150 3 0 3 3 0 8 0 fdescpl 528 630 0 599 3 0 3 3 0 8 0 filepl 160 2733 0 2527 13 2 11 12 0 8 1 lockfpl 104 60 0 58 1 0 1 1 0 8 0 lockfspl 48 26 0 24 1 0 1 1 0 8 0 sessionpl 144 33 0 24 1 0 1 1 0 8 0 pgrppl 48 48 0 32 1 0 1 1 0 8 0 ucredpl 104 266 0 253 1 0 1 1 0 8 0 zombiepl 144 600 0 599 1 0 1 1 0 8 0 processpl 1240 666 0 599 6 0 6 6 0 8 0 procpl 664 883 0 809 8 0 8 8 0 8 0 sosppl 176 3 0 3 1 0 1 1 0 8 1 sockpl 752 487 0 458 10 3 7 10 0 8 3 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl9k128 9344 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 16 0 16 16 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mextrefs 64 18 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 204 0 0 13 0 13 13 0 8 0 bufpl 272 2497 0 106 160 0 160 160 0 8 0 anonpl 32 5274 0 0 43 0 43 43 0 222 0 amapchunkpl 152 13529 0 13055 32 0 32 32 0 158 13 amappl16 200 2045 0 2024 5 3 2 5 0 8 0 amappl15 192 79 0 79 1 1 0 1 0 8 0 amappl14 184 576 0 573 1 0 1 1 0 8 0 amappl13 176 134 0 122 1 0 1 1 0 8 0 amappl12 168 903 0 874 2 0 2 2 0 8 0 amappl11 160 8 0 7 1 0 1 1 0 8 0 amappl10 152 66 0 52 1 0 1 1 0 8 0 amappl9 144 291 0 290 1 0 1 1 0 8 0 amappl8 136 119 0 117 1 0 1 1 0 8 0 amappl7 128 160 0 147 1 0 1 1 0 8 0 amappl6 120 202 0 198 1 0 1 1 0 8 0 amappl5 112 113 0 102 1 0 1 1 0 8 0 amappl4 104 311 0 291 1 0 1 1 0 8 0 amappl3 96 2360 0 2265 3 0 3 3 0 8 0 amappl2 88 750 0 677 2 0 2 2 0 8 0 amappl1 80 11674 0 11074 15 1 14 15 0 8 0 amappl 88 3694 0 3538 6 2 4 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 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 632 0 601 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 632 0 601 1 0 1 1 0 8 0 vmmpekpl 168 7390 0 7355 3 0 3 3 0 8 0 vmmpepl 168 49750 0 47867 89 2 87 87 0 357 3 vmsppl 488 631 0 601 5 0 5 5 0 8 0 rwobjpl 80 17241 0 16219 24 1 23 24 0 8 0 pdppl 4096 1272 0 1202 104 32 72 84 0 8 2 pvpl 32 11521 0 0 93 0 93 93 0 265 0 pmappl 256 631 0 601 3 0 3 3 0 8 0 extentpl 40 47 0 29 1 0 1 1 0 8 0 phpool 120 450 0 42 13 0 13 13 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff847d95a0) at panic+0x270 sys/kern/subr_prf.c:198 __assert(ffffffff8481b4e0,ffffffff8481b500,3bf,ffffffff8481bb80) at __assert+0x48 refcnt_finalize(ffff80003bbb3770,ffffffff84be57c0) at refcnt_finalize+0x203 sys/kern/kern_synch.c:960 pppx_if_destroy(3,ffff80003bbb3768) at pppx_if_destroy+0x53 sys/net/if_pppx.c:794 pppxclose(5beb,1,2000,ffff80003a737a28) at pppxclose+0xe4 sys/net/if_pppx.c:541 spec_close(ffff800038f1eda0) at spec_close+0x56b sys/kern/spec_vnops.c:538 VOP_CLOSE(ffff800001b891c0,1,ffff8000001198f0,ffff80003a737a28) at VOP_CLOSE+0x1e9 sys/kern/vfs_vops.c:156 vn_closefile(ffff800001ba4e88,ffff80003a737a28) at vn_closefile+0x1cc vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(ffff800001ba4e88,ffff80003a737a28) at vn_closefile+0x1cc sys/kern/vfs_vnops.c:621 fdrop(ffff800001ba4e88,ffff80003a737a28) at fdrop+0x1c3 sys/kern/kern_descrip.c:1281 closef(ffff800001ba4e88,ffff80003a737a28) at closef+0x263 sys/kern/kern_descrip.c:1265 sys_closefrom(ffff80003a737a28,ffff800038f1f260,ffff800038f1f1c0) at sys_closefrom+0x1bc sys/kern/kern_descrip.c:1471 syscall(ffff800038f1f260) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038f1f260) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8153193c810, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x19: leave x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x63c sys/dev/acpi/acpicpu_x86.c:-1 sched_idle(ffff800028fe3ff0) at sched_idle+0x566 sys/kern/kern_sched.c:204 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x63c sys/dev/acpi/acpicpu_x86.c:-1 sched_idle(ffff800028fe3ff0) at sched_idle+0x566 sys/kern/kern_sched.c:204 end trace frame: 0x0, count: -5