¹j¼õ¬|ÿ ž¨E1\…:panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 955 Starting stack trace... panic(ffffffff833aa97c) at panic+0x1d0 sys/kern/subr_prf.c:229 __assert(ffffffff833ec713,ffffffff833fe46d,3bb,ffffffff83428757) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c457500,ffffffff833a363a) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(ffff80002ffcf000,ffff80003c4574f8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff80002a310fc0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002a3647a0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805f80fcd8,2,fffffd80097fd548,ffff80002a310fc0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805ed1f238,ffff80002a310fc0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805ed1f238,ffff80002a310fc0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805ed1f238,ffff80002a310fc0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805ed1f238,ffff80002a310fc0) at closef+0x192 sys/kern/kern_descrip.c:1264 finishdup(ffff80002a310fc0,fffffd805ed1f558,5,4,ffff80002a364a00,2) at finishdup+0x478 sys/kern/kern_descrip.c:688 syscall(ffff80002a364ab0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a364ab0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1eda7fbf9f0, count: 244 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 -1535631960 EXIT 0 a Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 279063 22857 0 0 0x4000000 1 syz-executor * 21822 24148 0 0x2 0 0 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x75eaa4781d90, count: 14 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 *cpu1: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 955 ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x75eaa4781d90, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a34a680 rbx 0 rdx 0 rcx 0xffff8000ffffd760 rax 0x3c r8 0xffff80002a34a5b0 r9 0xffff80002a34a278 r10 0x8f62eb2306affce7 r11 0x88de84ecf2f5bc18 r12 0 r13 0 r14 0xffff8000ffffd760 r15 0 rip 0xffffffff8243d3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a34a600 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{0}> show proc PROC (syz-executor) tid=21822 pid=24148 tcnt=1 stat=onproc flags process=2 proc=0 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffdc90,0xffff80002a274d20 process=0xffff8000ffff6b58 user=0xffff80002a345000, vmspace=0xfffffd806f64c7a8 estcpu=36, cpticks=90, pctcpu=0.26, user=1, sys=87, intr=2 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 97221 182875 36750 0 2 0 syz-executor 97221 293283 36750 0 3 0x4000080 fsleep syz-executor 66269 215112 31642 0 2 0 syz-executor 66269 35522 31642 0 3 0x4000080 fsleep syz-executor 66269 251142 31642 0 2 0x4000000 syz-executor 43693 2597 43782 0 2 0 syz-executor 43693 438814 43782 0 3 0x4000080 piperd syz-executor 65309 135679 71382 0 2 0 syz-executor 65309 369704 71382 0 3 0x4000080 fsleep syz-executor 22857 385100 24148 0 2 0 syz-executor 22857 249050 24148 0 3 0x4000000 ifrmnet syz-executor 22857 279063 24148 0 7 0x4000000 syz-executor 22857 305229 24148 0 3 0x4000080 fsleep syz-executor 74563 107082 66034 0 2 0 syz-executor 74563 424655 66034 0 3 0x4000080 fsleep syz-executor 77321 92963 0 0 3 0x14200 acct acct 71382 233240 61662 0 2 0xc82 syz-executor 81069 1543 0 0 3 0x14280 nfsidl nfsio 68130 113538 0 0 3 0x14280 nfsidl nfsio 15493 124476 0 0 3 0x14280 nfsidl nfsio 67505 66449 0 0 3 0x14280 nfsidl nfsio 37798 258893 0 0 3 0x14280 nfsidl nfsio 12223 396470 0 0 3 0x14280 nfsidl nfsio 72440 458508 0 0 3 0x14280 nfsidl nfsio 38570 493544 0 0 3 0x14280 nfsidl nfsio 95543 493161 0 0 3 0x14280 nfsidl nfsio 36667 12712 0 0 3 0x14280 nfsidl nfsio 81252 236603 0 0 3 0x14280 nfsidl nfsio 79688 193068 0 0 3 0x14280 nfsidl nfsio 98894 155167 0 0 3 0x14280 nfsidl nfsio 41688 196095 0 0 3 0x14280 nfsidl nfsio 59336 75326 0 0 3 0x14280 nfsidl nfsio 71519 113119 0 0 3 0x14280 nfsidl nfsio 3610 76349 0 0 3 0x14280 nfsidl nfsio 50383 114409 0 0 3 0x14280 nfsidl nfsio 76465 370982 0 0 3 0x14280 nfsidl nfsio 89190 336937 0 0 3 0x14280 nfsidl nfsio 61366 291245 61662 0 3 0x82 wait syz-executor 66034 317939 61662 0 2 0xc82 syz-executor 28208 29955 61662 0 2 0xc82 syz-executor 43782 249115 61662 0 3 0x82 nanoslp syz-executor 31642 263 61662 0 3 0x82 nanoslp syz-executor *24148 21822 61662 0 7 0x2 syz-executor 36750 26170 61662 0 2 0xc82 syz-executor 61662 460118 23306 0 3 0x82 kqread syz-executor 23306 430278 18372 0 3 0x10008a sigsusp ksh 18372 327814 61420 0 3 0x98 kqread sshd-session 61420 130480 92873 0 3 0x92 kqread sshd-session 35497 426644 1 0 3 0x100083 ttyopn getty 92873 505430 1 0 3 0x88 kqread sshd 15966 428766 44716 74 3 0x1100092 bpf pflogd 44716 373761 1 0 3 0x80 sbwait pflogd 24478 120488 15588 73 3 0x1100090 kqread syslogd 15588 86994 1 0 3 0x100082 sbwait syslogd 48203 392276 1 0 3 0x100080 kqread resolvd 54132 431230 4141 77 3 0x100092 kqread dhcpleased 54714 91707 4141 77 3 0x100092 kqread dhcpleased 4141 261353 1 0 3 0x80 kqread dhcpleased 14123 164172 0 0 3 0x14200 bored smr 36199 392230 0 0 2 0x14200 zerothread 82902 306378 0 0 3 0x14200 aiodoned aiodoned 57101 69774 0 0 3 0x14200 syncer update 84222 153837 0 0 3 0x14200 cleaner cleaner 21154 172708 0 0 2 0x14200 reaper 69508 515723 0 0 3 0x14200 pgdaemon pagedaemon 87928 77933 0 0 3 0x14200 bored viomb 33290 222451 0 0 3 0x40014200 acpi0 acpi0 83895 282783 0 0 3 0x40014200 idle1 94141 296195 0 0 2 0x14200 softnet1 47878 87159 0 0 2 0x14200 softnet0 2874 441841 0 0 3 0x14200 bored systqmp 69757 270774 0 0 3 0x14200 bored systq 94675 357933 0 0 3 0x14200 tmoslp softclockmp 22061 231542 0 0 3 0x40014200 tmoslp softclock 78173 524187 0 0 3 0x40014200 idle0 1 161730 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff839cbd98) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 uvm_pmr_freepages+0x1a8 sys/uvm/uvm_pmemrange.c:-1 #3 uvm_anfree+0xe9 sys/uvm/uvm_anon.c:112 #4 amap_wipeout+0x246 sys/uvm/uvm_amap.c:-1 #5 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 #6 uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2530 #7 exit1+0x6fc sys/kern/kern_exit.c:260 #8 sys_exit+0x1a sys/kern/kern_exit.c:-1 #9 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #10 Xsyscall+0x128 Process 22857 (syz-executor) thread 0xffff80002a310fc0 (279063) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839c2000) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 vn_closefile+0x41 sys/kern/vfs_vnops.c:608 #2 fdrop+0x121 sys/kern/kern_descrip.c:1280 #3 closef+0x192 sys/kern/kern_descrip.c:1264 #4 finishdup+0x478 sys/kern/kern_descrip.c:688 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #6 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11068 12102K 14099K 166960K 14264 0 pcb 19 18K 23K 166960K 549 0 rtable 216 10K 10K 166960K 673 0 pf 35 17K 81K 166960K 176 0 ifaddr 38 7K 8K 166960K 141 0 ifgroup 52 2K 2K 166960K 222 0 sysctl 3 1K 9K 166960K 12 0 counters 70 36K 37K 166960K 362 0 ioctlops 0 0K 4K 166960K 1839 0 iov 0 0K 16K 166960K 60 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1516 95K 96K 166960K 2810 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 15 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 118 0 dirhash 12 2K 2K 166960K 45 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 240K 166960K 1439 0 sigio 0 0K 0K 166960K 21 0 proc 73 115K 164K 166960K 745 0 subproc 72 4K 4K 166960K 108 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 178 0 in_multi 74 5K 7K 166960K 227 0 ether_multi 1 0K 0K 166960K 13 0 mrt 1 0K 0K 166960K 14 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 562 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 249 161K 180K 166960K 14878 0 UVM aobj 35 8K 8K 166960K 43 0 pinsyscall 42 84K 105K 166960K 2664 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 125 0 NDP 11 0K 2K 166960K 94 0 temp 73 8686K 8936K 166960K 79056 0 kqueue 14 22K 32K 166960K 258 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 120 220 0 217 4 1 3 3 0 8 2 rtentry 176 211 0 124 6 0 6 6 0 8 0 unpcb 144 1166 0 1147 9 7 2 6 0 8 1 syncache 336 8 0 8 3 3 0 1 0 8 0 tcpqe 32 3 0 3 2 2 0 1 0 8 0 tcpcb 736 514 0 507 10 8 2 7 0 8 0 arp 136 29 0 15 1 0 1 1 0 8 0 inpcb 328 2141 0 2128 34 27 7 22 0 8 5 nd6 152 46 0 24 1 0 1 1 0 8 0 pkpcb 40 8 0 8 2 2 0 1 0 8 0 kcovpl 48 12 0 4 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 125 0 124 1 0 1 1 0 8 0 pppxif 1504 14 0 13 4 3 1 1 0 8 0 pffrag 232 10 0 5 1 0 1 1 0 482 0 pffrnode 88 9 0 4 1 0 1 1 0 8 0 pffrent 40 21 0 16 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 4 0 3 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 128 2 0 0 1 0 1 1 0 8 0 pfstate 448 1 0 0 1 0 1 1 0 8 0 pfrule 1360 4 0 3 1 0 1 1 0 8 0 rttmr 136 5 0 5 3 3 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 989 0 589 33 4 29 32 0 8 0 art_table 40 993 0 589 6 0 6 6 0 8 0 art_node 32 208 0 130 1 0 1 1 0 8 0 sysvmsgpl 40 26 0 20 1 0 1 1 0 8 0 semapl 112 115 0 105 1 0 1 1 0 8 0 shmpl 112 37 0 8 1 0 1 1 0 8 0 dirhash 1024 39 0 22 3 0 3 3 0 8 0 dino2pl 256 4016 0 2507 95 0 95 95 0 8 0 ffsino 296 4016 0 2507 117 0 117 117 0 8 0 nchpl 144 5995 0 4285 64 0 64 64 0 8 0 rtmask 32 7 0 7 3 2 1 1 0 8 1 vnodes 216 5055 0 0 281 0 281 281 0 8 0 namei 1024 22082 0 22082 2 1 1 1 0 8 1 percpumem 16 196 0 146 1 0 1 1 0 8 0 vcpupl 3968 3 0 0 1 0 1 1 0 8 0 vmpool 848 3 0 0 1 0 1 1 0 8 0 kstatmem 264 138 0 114 4 2 2 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 11 0 11 2 2 0 1 0 8 0 scxspl 216 58383 0 58382 17 11 6 8 1 8 5 plimitpl 152 716 0 697 1 0 1 1 0 8 0 sigapl 424 1744 0 1675 9 1 8 8 0 8 0 knotepl 120 522 0 0 16 0 16 16 0 8 0 kqueuepl 224 480 0 468 6 5 1 3 0 8 0 pipepl 344 252 0 224 6 3 3 6 0 8 0 fdescpl 528 1702 0 1671 3 0 3 3 0 8 0 filepl 160 12783 0 12561 36 20 16 23 0 8 4 lockfpl 104 875 0 873 3 2 1 2 0 8 0 lockfspl 48 282 0 280 1 0 1 1 0 8 0 sessionpl 144 30 0 21 1 0 1 1 0 8 0 pgrppl 48 89 0 72 1 0 1 1 0 8 0 ucredpl 104 1423 0 1410 1 0 1 1 0 8 0 zombiepl 144 1677 0 1675 1 0 1 1 0 8 0 processpl 1232 1744 0 1675 6 0 6 6 0 8 0 procpl 664 3982 0 3904 8 0 8 8 0 8 0 sosppl 176 9 0 8 3 2 1 1 0 8 0 sockpl 752 3564 0 3529 45 34 11 28 0 8 5 mcl64k 65536 18 0 0 3 0 3 3 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 108 0 0 14 0 14 14 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 22 0 0 3 0 3 3 0 8 0 mtagpl 96 139 0 0 4 0 4 4 0 8 0 mbufpl 256 321 0 0 20 0 20 20 0 8 0 bufpl 280 25999 0 19863 439 0 439 439 0 8 0 anonpl 32 14672 0 0 119 0 119 119 0 246 0 amapchunkpl 152 50528 0 49983 45 16 29 37 0 158 4 amappl16 200 8343 0 8301 80 47 33 33 0 8 21 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 10 0 10 1 1 0 1 0 8 0 amappl13 176 472 0 471 1 0 1 1 0 8 0 amappl12 168 2103 0 2061 3 0 3 3 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 55 0 39 1 0 1 1 0 8 0 amappl9 144 245 0 245 1 1 0 1 0 8 0 amappl8 136 44 0 40 1 0 1 1 0 8 0 amappl7 128 96 0 95 1 0 1 1 0 8 0 amappl6 120 331 0 317 1 0 1 1 0 8 0 amappl5 112 84 0 73 1 0 1 1 0 8 0 amappl4 104 469 0 437 2 1 1 2 0 8 0 amappl3 96 8688 0 8596 4 1 3 3 0 8 0 amappl2 88 1832 0 1755 2 0 2 2 0 8 0 amappl1 80 15561 0 14959 17 2 15 15 0 8 0 amappl 88 13859 0 13688 5 0 5 5 0 92 0 uvmvnodes 80 163 0 0 4 0 4 4 0 8 0 dma8192 8192 1 0 1 1 0 1 1 0 8 1 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma2048 2048 2 0 2 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 128 254 0 254 2 2 0 1 0 8 0 dma64 64 7 0 7 2 2 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 42 0 8 1 0 1 1 0 8 0 uaddrrnd 24 1702 0 1671 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1702 0 1671 1 0 1 1 0 8 0 vmmpekpl 168 14645 0 14596 3 0 3 3 0 8 0 vmmpepl 168 117110 0 115148 141 28 113 113 0 357 10 vmsppl 488 1701 0 1670 6 1 5 5 0 8 0 rwobjpl 80 34788 0 33633 43 7 36 36 0 8 3 pdppl 4096 3417 0 3343 115 41 74 85 0 8 0 pvpl 32 23977 0 0 196 2 194 194 0 265 0 pmappl 256 1704 0 1670 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 319 0 62 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x75eaa4781d90, count: -1 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(ffffffff839c1800) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839c1800) at __mp_lock+0x192 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff839c1800,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 tsleep_nsec(fffffd806c25c258,11,ffffffff8345317e,ffffffffffffffff) at tsleep_nsec+0x23d sys/kern/kern_synch.c:-1 biowait(fffffd806c25c258) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd806c25c258) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ffs_update(fffffd806e8ca1a0,1) at ffs_update+0x2fe sys/ufs/ffs/ffs_inode.c:111 ffs_truncate(fffffd806e8ca1a0,0,0,ffffffffffffffff) at ffs_truncate+0xc9b sys/ufs/ffs/ffs_inode.c:-1 ufs_inactive(ffff80002a3643c0) at ufs_inactive+0x202 sys/ufs/ufs/ufs_inode.c:84 VOP_INACTIVE(fffffd805d1c7638,ffff80002a310fc0) at VOP_INACTIVE+0x104 sys/kern/vfs_vops.c:498 vput(fffffd805d1c7638) at vput+0xe5 sys/kern/vfs_subr.c:789 vn_close(fffffd805d1c7638,2,ffffffffffffffff,ffff80002a310fc0) at vn_close+0xb7 sys/kern/vfs_vnops.c:294 end trace frame: 0xffff80002a3644d0, 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(ffffffff839c1800) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839c1800) at __mp_lock+0x192 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff839c1800,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 tsleep_nsec(fffffd806c25c258,11,ffffffff8345317e,ffffffffffffffff) at tsleep_nsec+0x23d sys/kern/kern_synch.c:-1 biowait(fffffd806c25c258) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd806c25c258) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ffs_update(fffffd806e8ca1a0,1) at ffs_update+0x2fe sys/ufs/ffs/ffs_inode.c:111 ffs_truncate(fffffd806e8ca1a0,0,0,ffffffffffffffff) at ffs_truncate+0xc9b sys/ufs/ffs/ffs_inode.c:-1 ufs_inactive(ffff80002a3643c0) at ufs_inactive+0x202 sys/ufs/ufs/ufs_inode.c:84 VOP_INACTIVE(fffffd805d1c7638,ffff80002a310fc0) at VOP_INACTIVE+0x104 sys/kern/vfs_vops.c:498 vput(fffffd805d1c7638) at vput+0xe5 sys/kern/vfs_subr.c:789 vn_close(fffffd805d1c7638,2,ffffffffffffffff,ffff80002a310fc0) at vn_close+0xb7 sys/kern/vfs_vnops.c:294 acct_shutdown() at acct_shutdown+0x8a sys/kern/kern_acct.c:361 vfs_shutdown(ffff80002a310fc0) at vfs_shutdown+0x23 sys/kern/vfs_subr.c:1791 boot(100) at boot+0x16f sys/arch/amd64/amd64/machdep.c:927 reboot(100) at reboot+0xb1 panic(ffffffff833aa97c) at panic+0x1f9 __assert(ffffffff833ec713,ffffffff833fe46d,3bb,ffffffff83428757) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c457500,ffffffff833a363a) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(ffff80002ffcf000,ffff80003c4574f8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff80002a310fc0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002a3647a0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805f80fcd8,2,fffffd80097fd548,ffff80002a310fc0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805ed1f238,ffff80002a310fc0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805ed1f238,ffff80002a310fc0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805ed1f238,ffff80002a310fc0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805ed1f238,ffff80002a310fc0) at closef+0x192 sys/kern/kern_descrip.c:1264 finishdup(ffff80002a310fc0,fffffd805ed1f558,5,4,ffff80002a364a00,2) at finishdup+0x478 sys/kern/kern_descrip.c:688 syscall(ffff80002a364ab0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a364ab0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1eda7fbf9f0, count: -31