panic: kernel diagnostic assertion "pg->wire_count == 1" failed: file "/syzkaller/managers/main/kernel/sys/kern/vfs_biomem.c", line 310 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *401412 21218 0 0 0x4000000 0 syz-executor.7 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82925487) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828dfd33,ffffffff828ea8e3,136,ffffffff8286a584) at __assert+0x29 sys/kern/subr_prf.c:157 buf_free_pages(fffffd80560a87c0) at buf_free_pages+0x1d0 sys/kern/vfs_biomem.c:299 buf_dealloc_mem(fffffd80560a87c0) at buf_dealloc_mem+0xe2 sys/kern/vfs_biomem.c:179 buf_put(fffffd80560a87c0) at buf_put+0x15e sys/kern/vfs_bio.c:127 brelse(fffffd80560a87c0) at brelse+0x26b sys/kern/vfs_bio.c:944 vinvalbuf(fffffd80731e4390,2,ffffffffffffffff,ffff80002d903d58,0,ffffffffffffffff) at vinvalbuf+0x3b8 sys/kern/vfs_subr.c:2025 ffs_truncate(fffffd80714be870,0,0,ffffffffffffffff) at ffs_truncate+0xb99 ufs_inactive(ffff800030f4f708) at ufs_inactive+0x16a sys/ufs/ufs/ufs_inode.c:84 VOP_INACTIVE(fffffd80731e4390,ffff80002d903d58) at VOP_INACTIVE+0xbf sys/kern/vfs_vops.c:489 vput(fffffd80731e4390) at vput+0xa6 sys/kern/vfs_subr.c:779 vn_close(fffffd80731e4390,2,fffffd807f7d7750,ffff80002d903d58) at vn_close+0x81 sys/kern/vfs_vnops.c:294 sys_acct(ffff80002d903d58,ffff800030f4f9d0,ffff800030f4f920) at sys_acct+0x136 sys/kern/kern_acct.c:140 end trace frame: 0xffff800030f4f9c0, 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 "pg->wire_count == 1" failed: file "/syzkaller/managers/main/kernel/sys/kern/vfs_biomem.c", line 310 ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82925487) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828dfd33,ffffffff828ea8e3,136,ffffffff8286a584) at __assert+0x29 sys/kern/subr_prf.c:157 buf_free_pages(fffffd80560a87c0) at buf_free_pages+0x1d0 sys/kern/vfs_biomem.c:299 buf_dealloc_mem(fffffd80560a87c0) at buf_dealloc_mem+0xe2 sys/kern/vfs_biomem.c:179 buf_put(fffffd80560a87c0) at buf_put+0x15e sys/kern/vfs_bio.c:127 brelse(fffffd80560a87c0) at brelse+0x26b sys/kern/vfs_bio.c:944 vinvalbuf(fffffd80731e4390,2,ffffffffffffffff,ffff80002d903d58,0,ffffffffffffffff) at vinvalbuf+0x3b8 sys/kern/vfs_subr.c:2025 ffs_truncate(fffffd80714be870,0,0,ffffffffffffffff) at ffs_truncate+0xb99 ufs_inactive(ffff800030f4f708) at ufs_inactive+0x16a sys/ufs/ufs/ufs_inode.c:84 VOP_INACTIVE(fffffd80731e4390,ffff80002d903d58) at VOP_INACTIVE+0xbf sys/kern/vfs_vops.c:489 vput(fffffd80731e4390) at vput+0xa6 sys/kern/vfs_subr.c:779 vn_close(fffffd80731e4390,2,fffffd807f7d7750,ffff80002d903d58) at vn_close+0x81 sys/kern/vfs_vnops.c:294 sys_acct(ffff80002d903d58,ffff800030f4f9d0,ffff800030f4f920) at sys_acct+0x136 sys/kern/kern_acct.c:140 syscall(ffff800030f4f9d0) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7846f196ab0, count: -16 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800030f4f210 rbx 0 rdx 0xffff800000ec4b80 rcx 0 rax 0xffff80002d903d58 r8 0x101010101010101 r9 0x8080808080808080 r10 0xa8039ff76c915714 r11 0xf3bd093246c420ad r12 0 r13 0xfffffd8005f9b400 r14 0 r15 0x1 rip 0xffffffff821623bc db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800030f4f200 ss 0 db_enter+0x1c: addq $0x8,%rsp ddb> show proc PROC (syz-executor.7) tid=401412 pid=21218 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=17, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002d903560,0xffff80002a6aed60 process=0xffff8000ffff25d0 user=0xffff800030f4a000, vmspace=0xfffffd805e197040 estcpu=36, cpticks=19, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 27446 306001 31087 0 2 0 syz-executor.2 27446 467901 31087 0 3 0x4000000 biowait syz-executor.2 27446 355132 31087 0 3 0x4000000 inode syz-executor.2 26001 5114 45709 0 2 0 syz-executor.6 26001 460030 45709 0 3 0x4000080 fsleep syz-executor.6 21218 434157 51468 0 2 0 syz-executor.7 *21218 401412 51468 0 7 0x4000000 syz-executor.7 21218 86911 51468 0 3 0x4000080 fsleep syz-executor.7 57776 297534 35309 0 3 0x80 nanoslp syz-executor.4 57776 77799 35309 0 3 0x4000080 lockf syz-executor.4 57776 436428 35309 0 3 0x4000080 fsleep syz-executor.4 57776 97835 35309 0 3 0x4000080 fsleep syz-executor.4 35309 136306 82104 0 3 0x82 nanoslp syz-executor.4 27088 248359 82104 0 3 0x82 nanoslp syz-executor.0 15984 66107 82104 0 2 0x2 syz-executor.1 45709 126940 82104 0 3 0x82 nanoslp syz-executor.6 64255 28658 82104 0 3 0x2 biowait syz-executor.5 42869 116503 82104 0 3 0x82 nanoslp syz-executor.3 31087 129340 82104 0 3 0x82 nanoslp syz-executor.2 51468 347386 82104 0 3 0x82 nanoslp syz-executor.7 48676 250679 24397 0 3 0x18100082 netio arp 24397 277990 1 0 3 0x810008a sigsusp sh 13828 70898 0 0 3 0x14280 nfsidl nfsio 27413 151462 0 0 3 0x14280 nfsidl nfsio 76213 20059 0 0 3 0x14280 nfsidl nfsio 81950 24476 0 0 3 0x14280 nfsidl nfsio 44179 248199 0 0 3 0x14280 nfsidl nfsio 87927 175085 0 0 3 0x14280 nfsidl nfsio 14031 122618 0 0 3 0x14280 nfsidl nfsio 16169 399437 0 0 3 0x14280 nfsidl nfsio 36759 407196 0 0 3 0x14280 nfsidl nfsio 17472 437840 0 0 3 0x14280 nfsidl nfsio 34690 71209 0 0 3 0x14280 nfsidl nfsio 36811 126327 0 0 3 0x14280 nfsidl nfsio 12695 266513 0 0 3 0x14280 nfsidl nfsio 46552 28907 0 0 3 0x14280 nfsidl nfsio 86165 196444 0 0 3 0x14280 nfsidl nfsio 98928 192649 0 0 3 0x14280 nfsidl nfsio 73297 39099 0 0 3 0x14280 nfsidl nfsio 34677 308953 0 0 3 0x14280 nfsidl nfsio 57221 93079 0 0 3 0x14280 nfsidl nfsio 31233 403333 0 0 3 0x14280 nfsidl nfsio 86826 276811 1 0 3 0x18100083 ttyopn getty 26495 392067 0 0 3 0x14200 acctlk acct 30808 519408 0 0 3 0x14200 bored sosplice 82104 203108 54742 0 3 0x1a000082 thrsleep syz-fuzzer 82104 250955 54742 0 3 0x1e000082 thrsleep syz-fuzzer 82104 27212 54742 0 3 0x1e000082 wait syz-fuzzer 82104 236477 54742 0 3 0x1e000082 wait syz-fuzzer 82104 437188 54742 0 3 0x1e000082 thrsleep syz-fuzzer 82104 301359 54742 0 3 0x1e000082 wait syz-fuzzer 82104 463485 54742 0 3 0x1e000082 wait syz-fuzzer 82104 427570 54742 0 3 0x1e000082 wait syz-fuzzer 82104 463486 54742 0 3 0x1e000082 wait syz-fuzzer 82104 254617 54742 0 3 0x1e000082 thrsleep syz-fuzzer 82104 336242 54742 0 3 0x1e000082 wait syz-fuzzer 82104 216250 54742 0 3 0x1e000082 wait syz-fuzzer 82104 476135 54742 0 3 0x1e000082 thrsleep syz-fuzzer 82104 213124 54742 0 3 0x1e000082 kqread syz-fuzzer 82104 421205 54742 0 3 0x1e000082 thrsleep syz-fuzzer 54742 81500 18758 0 3 0x810008a sigsusp ksh 18758 436213 11238 0 3 0x1800009a kqread sshd 11238 305867 1 0 3 0x18000088 kqread sshd 41019 335335 67904 73 3 0x19100090 kqread syslogd 67904 358274 1 0 3 0x18100082 netio syslogd 96798 62011 1 0 3 0x18100080 kqread resolvd 29604 420903 51361 77 3 0x18100092 kqread dhcpleased 5025 491263 51361 77 3 0x18100092 kqread dhcpleased 51361 4800 1 0 3 0x18000080 kqread dhcpleased 76334 495406 0 0 3 0x14200 bored smr 40786 329041 0 0 2 0x14200 zerothread 79980 173263 0 0 3 0x14200 aiodoned aiodoned 11346 17502 0 0 3 0x14200 syncer update 25646 65665 0 0 3 0x14200 cleaner cleaner 60169 173643 0 0 3 0x14200 reaper reaper 418 245175 0 0 3 0x14200 pgdaemon pagedaemon 23819 41394 0 0 3 0x14200 bored viomb 61974 219015 0 0 3 0x40014200 acpi0 acpi0 84228 439067 0 0 3 0x14200 bored softnet3 65934 245005 0 0 3 0x14200 bored softnet2 63765 117395 0 0 3 0x14200 bored softnet1 87224 519945 0 0 3 0x14200 bored softnet0 58048 485836 0 0 3 0x14200 bored systqmp 88856 6615 0 0 3 0x14200 bored systq 79035 231321 0 0 3 0x40014200 tmoslp softclock 49556 48560 0 0 3 0x40014200 idle0 1 100337 0 0 3 0x8000082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10220 6497K 7788K 166960K 69223 0 pcb 15 20K 22K 166960K 2108 0 rtable 221 11K 12K 166960K 8165 0 pf 31 9K 10K 166960K 1002 0 ifaddr 41 14K 16K 166960K 1164 0 ifgroup 54 2K 2K 166960K 1733 0 sysctl 4 1K 1K 166960K 10 0 counters 31 17K 18K 166960K 457 0 ioctlops 0 0K 2K 166960K 1801 0 iov 0 0K 28K 166960K 3254 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1823 114K 115K 166960K 20706 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 138 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 1518 0 dirhash 12 2K 3K 166960K 159 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 16 57K 77K 166960K 26333 0 sigio 0 0K 0K 166960K 1491 0 proc 64 59K 84K 166960K 7977 0 subproc 117 7K 8K 166960K 3172 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 1566 0 in_multi 88 6K 7K 166960K 2849 0 ether_multi 1 0K 0K 166960K 13 0 mrt 1 0K 0K 166960K 13 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 253 1129K 1129K 166960K 253 0 exec 0 0K 1K 166960K 6352 0 pfkey data 0 0K 0K 166960K 17 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 611 1004K 1014K 166960K 232913 0 UVM aobj 131 4K 5K 166960K 137 0 pinsyscall 25 50K 100K 166960K 8882 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 788 0 NDP 12 0K 2K 166960K 903 0 temp 74 6804K 7152K 166960K 238386 0 kqueue 12 18K 28K 166960K 2155 0 SYN cache 2 48K 56K 166960K 4 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 1529 0 1525 8 6 2 3 0 8 1 rtentry 112 2739 0 2640 6 2 4 4 0 8 0 unpcb 144 19846 0 19833 39 33 6 8 0 8 5 syncache 336 226 0 226 6 5 1 1 0 8 1 sackhl 24 4 73 4 1 1 0 1 0 8 0 tcpqe 32 473 0 473 7 6 1 2 0 8 1 tcpcb 808 7964 0 7959 62 53 9 15 0 8 8 arp 88 512 0 496 1 0 1 1 0 8 0 ipq 40 32 0 31 3 2 1 1 0 8 0 ipqe 40 245 0 244 3 2 1 1 0 8 0 inpcb 360 21893 0 21865 102 90 12 19 0 8 8 nd6 104 712 0 691 1 0 1 1 0 8 0 pkpcb 40 190 0 190 6 5 1 1 0 8 1 kcovpl 48 243 0 234 1 0 1 1 0 8 0 ppxss 1072 72 0 72 5 4 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 10736 0 10319 135 106 29 30 0 8 2 art_table 32 10737 0 10319 4 0 4 4 0 8 0 art_node 16 2722 0 2632 1 0 1 1 0 8 0 sysvmsgpl 40 39 0 32 1 0 1 1 0 8 0 semapl 112 1516 0 1506 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 115 0 98 3 0 3 3 0 8 0 dino2pl 256 34824 0 33171 104 0 104 104 0 8 0 ffsino 240 34824 0 33171 98 0 98 98 0 8 0 nchpl 144 67911 0 66173 66 0 66 66 0 8 0 uvmvnodes 80 10279 0 0 210 0 210 210 0 8 0 vnodes 216 10279 0 0 572 0 572 572 0 8 0 namei 1024 260644 0 260641 8 7 1 2 0 8 0 vcpupl 2048 226 0 0 29 0 29 29 0 8 0 vmpool 664 334 0 108 21 2 19 19 0 8 0 kstatmem 264 876 0 852 3 1 2 3 0 8 0 scxspl 216 261153 0 261151 22 18 4 8 1 8 3 plimitpl 152 5281 0 5265 1 0 1 1 0 8 0 sigapl 424 26927 0 26860 8 0 8 8 0 8 0 futexpl 64 231083 0 231079 1 0 1 1 0 8 0 knotepl 120 216284 0 216202 34 24 10 11 0 8 6 kqueuepl 184 4732 0 4723 24 18 6 7 0 8 5 pipepl 288 4860 0 4829 31 24 7 11 0 8 4 fdescpl 432 26069 0 26042 4 0 4 4 0 8 0 filepl 120 165557 0 165299 56 41 15 20 0 8 6 lockfpl 104 8179 0 8174 7 5 2 2 0 8 1 lockfspl 48 2711 0 2707 1 0 1 1 0 8 0 sessionpl 144 256 0 239 1 0 1 1 0 8 0 pgrppl 48 747 0 730 1 0 1 1 0 8 0 ucredpl 104 27274 0 27261 1 0 1 1 0 8 0 zombiepl 144 26862 0 26860 1 0 1 1 0 8 0 processpl 1072 26927 0 26860 5 0 5 5 0 8 0 procpl 680 62476 0 62387 15 6 9 9 0 8 0 sosppl 168 240 0 240 3 2 1 1 0 8 1 sockpl 488 43507 0 43462 599 583 16 35 0 8 8 mcl64k 65536 1145 0 1145 6 5 1 1 0 8 1 mcl16k 16384 531 0 531 6 5 1 1 0 8 1 mcl12k 12288 1066 0 1066 6 5 1 1 0 8 1 mcl9k 9216 454 0 454 6 5 1 1 0 8 1 mcl8k 8192 1952 0 1952 6 5 1 1 0 8 1 mcl4k 4096 2630 0 2630 7 5 2 2 0 8 2 mcl2k2 2112 166 0 166 6 5 1 1 0 8 1 mcl2k 2048 128203 0 128157 88 74 14 32 0 8 7 mtagpl 96 6295 0 6137 32 24 8 19 0 8 4 mbufpl 256 450894 0 450608 832 810 22 439 0 8 1 bufpl 280 53760 0 43480 735 0 735 735 0 8 0 anonpl 24 2427191 0 2411763 264 126 138 157 0 188 29 amapchunkpl 152 734148 0 733249 130 75 55 66 0 158 18 amappl16 200 42474 0 41930 89 57 32 38 0 8 0 amappl15 192 271 0 270 1 0 1 1 0 8 0 amappl14 184 844 0 830 2 1 1 2 0 8 0 amappl13 176 43 0 43 6 5 1 1 0 8 1 amappl12 168 30121 0 30083 3 0 3 3 0 8 1 amappl11 160 68 0 58 1 0 1 1 0 8 0 amappl10 152 282 0 270 1 0 1 1 0 8 0 amappl9 144 296 0 292 1 0 1 1 0 8 0 amappl8 136 1259 0 1124 5 0 5 5 0 8 0 amappl7 128 171 0 155 1 0 1 1 0 8 0 amappl6 120 3323 0 3297 3 1 2 2 0 8 1 amappl5 112 1589 0 1577 1 0 1 1 0 8 0 amappl4 104 2582 0 2540 5 3 2 2 0 8 0 amappl3 96 142855 0 142770 3 0 3 3 0 8 0 amappl2 88 28017 0 27941 4 2 2 4 0 8 0 amappl1 80 116415 0 115891 22 10 12 22 0 8 0 amappl 88 230092 0 229775 8 0 8 8 0 92 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 72 136 0 6 3 0 3 3 0 8 0 uaddrrnd 24 26403 0 26149 2 0 2 2 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 26403 0 26149 2 0 2 2 0 8 0 vmmpekpl 168 175921 0 175818 6 0 6 6 0 8 0 vmmpepl 168 1659472 0 1656775 262 105 157 164 0 357 17 vmsppl 352 26402 0 26149 24 0 24 24 0 8 0 rwobjpl 24 359356 0 347176 76 2 74 74 0 8 0 pdppl 4096 52812 0 52524 1848 1554 294 296 0 8 6 pvpl 32 7711791 0 7690358 701 411 290 389 0 265 100 pmappl 216 26402 0 26149 15 0 15 15 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 3288 0 2661 29 9 20 28 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82925487) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828dfd33,ffffffff828ea8e3,136,ffffffff8286a584) at __assert+0x29 sys/kern/subr_prf.c:157 buf_free_pages(fffffd80560a87c0) at buf_free_pages+0x1d0 sys/kern/vfs_biomem.c:299 buf_dealloc_mem(fffffd80560a87c0) at buf_dealloc_mem+0xe2 sys/kern/vfs_biomem.c:179 buf_put(fffffd80560a87c0) at buf_put+0x15e sys/kern/vfs_bio.c:127 brelse(fffffd80560a87c0) at brelse+0x26b sys/kern/vfs_bio.c:944 vinvalbuf(fffffd80731e4390,2,ffffffffffffffff,ffff80002d903d58,0,ffffffffffffffff) at vinvalbuf+0x3b8 sys/kern/vfs_subr.c:2025 ffs_truncate(fffffd80714be870,0,0,ffffffffffffffff) at ffs_truncate+0xb99 ufs_inactive(ffff800030f4f708) at ufs_inactive+0x16a sys/ufs/ufs/ufs_inode.c:84 VOP_INACTIVE(fffffd80731e4390,ffff80002d903d58) at VOP_INACTIVE+0xbf sys/kern/vfs_vops.c:489 vput(fffffd80731e4390) at vput+0xa6 sys/kern/vfs_subr.c:779 vn_close(fffffd80731e4390,2,fffffd807f7d7750,ffff80002d903d58) at vn_close+0x81 sys/kern/vfs_vnops.c:294 sys_acct(ffff80002d903d58,ffff800030f4f9d0,ffff800030f4f920) at sys_acct+0x136 sys/kern/kern_acct.c:140 syscall(ffff800030f4f9d0) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7846f196ab0, count: -16 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82925487) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828dfd33,ffffffff828ea8e3,136,ffffffff8286a584) at __assert+0x29 sys/kern/subr_prf.c:157 buf_free_pages(fffffd80560a87c0) at buf_free_pages+0x1d0 sys/kern/vfs_biomem.c:299 buf_dealloc_mem(fffffd80560a87c0) at buf_dealloc_mem+0xe2 sys/kern/vfs_biomem.c:179 buf_put(fffffd80560a87c0) at buf_put+0x15e sys/kern/vfs_bio.c:127 brelse(fffffd80560a87c0) at brelse+0x26b sys/kern/vfs_bio.c:944 vinvalbuf(fffffd80731e4390,2,ffffffffffffffff,ffff80002d903d58,0,ffffffffffffffff) at vinvalbuf+0x3b8 sys/kern/vfs_subr.c:2025 ffs_truncate(fffffd80714be870,0,0,ffffffffffffffff) at ffs_truncate+0xb99 ufs_inactive(ffff800030f4f708) at ufs_inactive+0x16a sys/ufs/ufs/ufs_inode.c:84 VOP_INACTIVE(fffffd80731e4390,ffff80002d903d58) at VOP_INACTIVE+0xbf sys/kern/vfs_vops.c:489 vput(fffffd80731e4390) at vput+0xa6 sys/kern/vfs_subr.c:779 vn_close(fffffd80731e4390,2,fffffd807f7d7750,ffff80002d903d58) at vn_close+0x81 sys/kern/vfs_vnops.c:294 sys_acct(ffff80002d903d58,ffff800030f4f9d0,ffff800030f4f920) at sys_acct+0x136 sys/kern/kern_acct.c:140 syscall(ffff800030f4f9d0) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7846f196ab0, count: -16