Wpanic: AkeRrnNeIlN dGi: agSPnosL tNiOc aTs sLeOrtWEiRoEn D "reOfNs S!Y=S C~0AL"L f7a4i le-1d8:1 fil7e2 14"/97s6y zEkaXlIlTe r/m0a naa geStopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND * 16616 3070 0 0 0 0 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x763b7a5a6ff0, 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 951 ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x763b7a5a6ff0, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800037bee470 rbx 0 rdx 0 rcx 0xffff8000ffff1c50 rax 0x3c r8 0xffff800037bee3a0 r9 0 r10 0xa39d15e0f776f4e8 r11 0xb511e88e526526a2 r12 0 r13 0 r14 0xffff8000ffff1c50 r15 0 rip 0xffffffff824d03ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff800037bee3f0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{0}> show proc PROC (syz-executor) tid=16616 pid=3070 tcnt=2 stat=onproc flags process=0 proc=0 runpri=50, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffe5c60,0xffff8000ffff02c0 process=0xffff80003bc0b0a0 user=0xffff800037be9000, vmspace=0xfffffd805e97b988 estcpu=36, cpticks=3, pctcpu=0.0, user=0, sys=2, intr=1 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND * 3070 16616 25664 0 7 0 syz-executor 3070 186612 25664 0 3 0x4000080 fsleep syz-executor 13028 388350 18291 0 3 0x80 nanoslp syz-executor 13028 255209 18291 0 2 0x4000000 syz-executor 95864 417688 85257 0 3 0x80 nanoslp syz-executor 95864 497131 85257 0 3 0x4000080 netcon syz-executor 95864 436151 85257 0 3 0x4000080 fsleep syz-executor 43327 228374 37444 0 2 0x2 syz-executor 85627 449397 39725 0 3 0x3000 suspend syz-executor 85627 108738 39725 0 3 0x4081000 biowait syz-executor 85627 121617 39725 0 3 0x4081000 inode syz-executor 57081 106135 1 0 3 0x100083 ttyin getty 39147 172056 0 0 3 0x14200 bored sosplice 7799 19101 37444 0 3 0x82 nanoslp syz-executor 94724 302259 37444 0 3 0x82 wait syz-executor 85257 269364 37444 0 3 0x82 nanoslp syz-executor 31634 11825 37444 0 2 0x2 syz-executor 39725 407548 37444 0 3 0x82 nanoslp syz-executor 18291 225407 37444 0 3 0x82 nanoslp syz-executor 25664 263795 37444 0 3 0x82 nanoslp syz-executor 37444 222889 37230 0 2 0x2 syz-executor 37230 173424 38790 0 3 0x10008a sigsusp ksh 38790 373502 84922 0 3 0x98 kqread sshd-session 84922 449355 74263 0 3 0x92 kqread sshd-session 74263 395758 1 0 3 0x88 kqread sshd 632 195647 52811 74 3 0x1100092 bpf pflogd 52811 430366 1 0 3 0x80 sbwait pflogd 16524 487096 83468 73 3 0x1100090 kqread syslogd 83468 118601 1 0 3 0x100082 sbwait syslogd 32978 494914 1 0 2 0x100000 resolvd 29091 367624 83936 77 2 0x100012 dhcpleased 18036 201441 83936 77 3 0x100092 kqread dhcpleased 83936 27577 1 0 3 0x80 kqread dhcpleased 54563 42126 0 0 3 0x14200 bored smr 10663 251605 0 0 3 0x14200 pgzero zerothread 9160 463948 0 0 3 0x14200 aiodoned aiodoned 75699 420983 0 0 3 0x14200 syncer update 25033 79159 0 0 3 0x14200 cleaner cleaner 87265 435534 0 0 3 0x14200 reaper reaper 61750 41627 0 0 3 0x14200 pgdaemon pagedaemon 59613 344424 0 0 3 0x14200 bored viomb 64801 149919 0 0 3 0x40014200 acpi0 acpi0 57448 302046 0 0 3 0x40014200 idle1 2214 438515 0 0 3 0x14200 bored softnet3 56761 20680 0 0 3 0x14200 bored softnet2 20684 155253 0 0 3 0x14200 bored softnet1 81255 412557 0 0 2 0x14200 softnet0 79902 94622 0 0 3 0x14200 bored systqmp 72544 167945 0 0 3 0x14200 bored systq 50992 97676 0 0 3 0x14200 tmoslp softclockmp 55930 99397 0 0 3 0x40014200 tmoslp softclock 31255 258494 0 0 3 0x40014200 idle0 1 329360 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806bf40810) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 pmap_write_protect+0x87 rcr3 machine/cpufunc.h:139 [inline] #3 pmap_write_protect+0x87 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] #3 pmap_write_protect+0x87 sys/arch/amd64/amd64/pmap.c:2163 #4 uvm_map_protect+0xbcd pmap_protect machine/pmap.h:476 [inline] #4 uvm_map_protect+0xbcd sys/uvm/uvm_map.c:3191 #5 sys_mprotect+0x34c sys/uvm/uvm_mmap.c:590 #6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:637 #7 Xsyscall+0x128 Process 3070 (syz-executor) thread 0xffff8000ffff1c50 (16616) exclusive rwlock uobjlk r = 0 (0xfffffd806cfad9b8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 uvm_map_protect+0xb6e sys/uvm/uvm_map.c:3191 #3 sys_mprotect+0x34c sys/uvm/uvm_mmap.c:590 #4 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:637 #5 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffffd805e97ba88) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5168 #3 uvm_map_protect+0xe1 sys/uvm/uvm_map.c:3064 #4 sys_mprotect+0x34c sys/uvm/uvm_mmap.c:590 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:637 #6 Xsyscall+0x128 exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806bf40810) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 pmap_write_protect+0x87 rcr3 machine/cpufunc.h:139 [inline] #3 pmap_write_protect+0x87 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] #3 pmap_write_protect+0x87 sys/arch/amd64/amd64/pmap.c:2163 #4 uvm_map_protect+0xbcd pmap_protect machine/pmap.h:476 [inline] #4 uvm_map_protect+0xbcd sys/uvm/uvm_map.c:3191 #5 sys_mprotect+0x34c sys/uvm/uvm_mmap.c:590 #6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:637 #7 Xsyscall+0x128 Process 85627 (syz-executor) thread 0xffff8000ffff0a60 (108738) exclusive rrwlock inode r = 0 (0xfffffd806bdd52e0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x190 sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x23c sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:637 #9 Xsyscall+0x128 Process 85627 (syz-executor) thread 0xffff8000fffe54b0 (121617) exclusive rrwlock inode r = 0 (0xfffffd806d84e8a8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 uipc_bind+0x2f4 sys/kern/uipc_usrreq.c:371 #8 sys_bind+0x28a sys/kern/uipc_syscalls.c:189 #9 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:637 #10 Xsyscall+0x128 Process 81255 (softnet0) thread 0xffff8000ffffe000 (412557) shared rwlock softnet0 r = 0 (0xffff80000002c078) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10210 11025K 11365K 166960K 12228 0 pcb 17 12K 12K 166960K 168 0 rtable 212 7K 8K 166960K 509 0 pf 35 17K 81K 166960K 108 0 ifaddr 40 7K 7K 166960K 84 0 ifgroup 56 2K 2K 166960K 132 0 sysctl 3 1K 9K 166960K 12 0 counters 70 37K 37K 166960K 130 0 ioctlops 0 0K 4K 166960K 1586 0 iov 0 0K 16K 166960K 40 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1329 84K 84K 166960K 2079 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 16K 20K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 19 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 97K 166960K 2369 0 sigio 0 0K 0K 166960K 19 0 proc 72 91K 152K 166960K 639 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 118 0 in_multi 87 6K 7K 166960K 172 0 ether_multi 1 0K 0K 166960K 19 0 mrt 2 0K 0K 166960K 15 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 459 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 234 168K 183K 166960K 20032 0 UVM aobj 8 2K 2K 166960K 10 0 pinsyscall 41 82K 108K 166960K 3485 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 57 0 NDP 14 0K 2K 166960K 54 0 temp 55 8690K 8945K 166960K 43366 0 kqueue 14 22K 26K 166960K 205 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 120 106 0 103 1 0 1 1 0 8 0 rtentry 176 147 0 52 6 0 6 6 0 8 0 unpcb 144 413 0 394 1 0 1 1 0 8 0 syncache 336 4 0 4 3 2 1 1 0 8 1 tcpcb 736 213 0 208 1 0 1 1 0 8 0 arp 128 25 0 5 1 0 1 1 0 8 0 inpcb 328 741 0 731 3 1 2 2 0 8 1 nd6 144 28 0 6 1 0 1 1 0 8 0 pkpcb 40 7 0 7 2 2 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 19 0 18 1 0 1 1 0 8 0 pppxif 1504 8 0 7 1 0 1 1 0 8 0 pffrag 232 4 0 2 1 0 1 1 0 482 0 pffrnode 88 4 0 2 1 0 1 1 0 8 0 pffrent 40 8 0 6 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 pfstitem 24 74 0 23 1 0 1 1 0 8 0 pfstkey 128 74 0 23 2 0 2 2 0 8 0 pfstate 384 74 0 23 6 0 6 6 0 8 0 pfrule 1344 23 0 17 2 1 1 2 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 256 609 0 206 29 2 27 29 0 8 0 art_table 32 611 0 206 4 0 4 4 0 8 0 art_node 16 143 0 59 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 6 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 16 0 6 1 0 1 1 0 8 0 shmpl 112 7 0 2 1 0 1 1 0 8 0 dirhash 1024 25 0 8 3 0 3 3 0 8 0 dino2pl 256 4704 0 3203 95 0 95 95 0 8 0 ffsino 288 4704 0 3203 109 0 109 109 0 8 0 nchpl 144 7368 0 6841 63 31 32 63 0 8 8 uvmvnodes 80 5120 0 0 105 0 105 105 0 8 0 vnodes 216 5120 0 0 285 0 285 285 0 8 0 namei 1024 18555 0 18554 3 2 1 2 0 8 0 percpumem 16 80 0 30 1 0 1 1 0 8 0 kstatmem 264 72 0 46 3 0 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 6 0 6 1 0 1 1 0 8 1 scxspl 216 26706 0 26705 12 10 2 8 1 8 1 plimitpl 152 126 0 108 1 0 1 1 0 8 0 sigapl 424 2692 0 2643 9 2 7 9 0 8 0 knotepl 120 567 0 0 17 0 17 17 0 8 0 kqueuepl 224 216 0 205 1 0 1 1 0 8 0 pipepl 336 136 0 109 4 1 3 3 0 8 0 fdescpl 520 2650 0 2620 3 0 3 3 0 8 0 filepl 160 6733 0 6515 11 1 10 10 0 8 0 lockfpl 104 346 0 344 1 0 1 1 0 8 0 lockfspl 48 144 0 142 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 44 0 27 1 0 1 1 0 8 0 ucredpl 104 960 0 946 1 0 1 1 0 8 0 zombiepl 144 2646 0 2643 3 2 1 1 0 8 0 processpl 1240 2692 0 2643 7 2 5 6 0 8 0 procpl 656 5154 0 5099 7 1 6 7 0 8 0 srpgc 96 4 0 4 1 0 1 1 0 8 1 sockpl 728 1286 0 1254 6 2 4 4 0 8 0 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 122 0 0 16 0 16 16 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 21 0 0 1 0 1 1 0 8 0 mbufpl 256 1211 0 0 76 0 76 76 0 8 0 bufpl 280 8852 0 2710 440 0 440 440 0 8 1 anonpl 32 8518 0 0 69 0 69 69 0 246 0 amapchunkpl 152 69564 0 69105 39 12 27 29 0 158 7 amappl16 200 5593 0 5329 41 27 14 18 0 8 0 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 116 0 104 1 0 1 1 0 8 0 amappl13 176 3 0 3 2 2 0 1 0 8 0 amappl12 168 3314 0 3284 3 1 2 2 0 8 0 amappl11 160 81 0 67 1 0 1 1 0 8 0 amappl10 152 29 0 29 2 2 0 1 0 8 0 amappl9 144 242 0 242 2 2 0 1 0 8 0 amappl8 136 33 0 31 1 0 1 1 0 8 0 amappl7 128 123 0 110 1 0 1 1 0 8 0 amappl6 120 180 0 177 2 1 1 1 0 8 0 amappl5 112 124 0 115 1 0 1 1 0 8 0 amappl4 104 321 0 301 1 0 1 1 0 8 0 amappl3 96 15237 0 15129 5 1 4 4 0 8 0 amappl2 88 652 0 592 2 0 2 2 0 8 0 amappl1 80 17382 0 16771 18 4 14 15 0 8 0 amappl 88 19223 0 19063 5 0 5 5 0 92 0 dma65536 65536 1 0 1 1 0 1 1 0 8 1 dma16384 16384 1 0 1 1 0 1 1 0 8 1 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 254 0 254 2 2 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 2 1 1 1 0 8 1 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 9 0 2 1 0 1 1 0 8 0 uaddrrnd 24 2650 0 2620 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2650 0 2620 1 0 1 1 0 8 0 vmmpekpl 168 18089 0 18047 2 0 2 2 0 8 0 vmmpepl 168 158176 0 155999 109 6 103 103 0 357 3 vmsppl 480 2649 0 2620 6 1 5 5 0 8 0 rwobjpl 72 40929 0 34638 115 0 115 115 0 8 0 pdppl 4096 5307 0 5240 108 35 73 87 0 8 6 pvpl 32 17543 0 0 142 1 141 141 0 265 0 pmappl 256 2649 0 2620 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 471 0 46 13 0 13 13 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x763b7a5a6ff0, 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 x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:666 acpitimer_delay(1) at acpitimer_delay+0x175 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x175 sys/dev/acpi/acpitimer.c:125 comcnputc(800,65) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(65) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x2aba sys/kern/subr_prf.c:1065 db_printf(ffffffff833fc7d0) at db_printf+0x9b sys/kern/subr_prf.c:-1 panic(ffffffff83469383) at panic+0x103 sys/kern/subr_prf.c:216 __assert(ffffffff83414efe,ffffffff8341d686,3b7,ffffffff8341d709) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c445788,ffffffff8335de51) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80003c445780) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 end trace frame: 0xffff80002a3489c0, 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 x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:666 acpitimer_delay(1) at acpitimer_delay+0x175 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x175 sys/dev/acpi/acpitimer.c:125 comcnputc(800,65) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(65) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x2aba sys/kern/subr_prf.c:1065 db_printf(ffffffff833fc7d0) at db_printf+0x9b sys/kern/subr_prf.c:-1 panic(ffffffff83469383) at panic+0x103 sys/kern/subr_prf.c:216 __assert(ffffffff83414efe,ffffffff8341d686,3b7,ffffffff8341d709) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c445788,ffffffff8335de51) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80003c445780) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff8000ffff0020) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002a348a40) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806ff5c2d8,1,fffffd80097fb750,ffff8000ffff0020) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806d2ffc98,ffff8000ffff0020) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806d2ffc98,ffff8000ffff0020) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806d2ffc98,ffff8000ffff0020) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806d2ffc98,ffff8000ffff0020) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff8000ffff0020) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff8000ffff0020,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff8000ffff0020,ffff80002a348db0,ffff80002a348d00) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a348db0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a348db0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:637 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ecd44367540, count: -25