login: panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 944 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 166056 55991 0 0 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8343a8fc) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833e9713,ffffffff833ececa,3b0,ffffffff833ecf12) at __assert+0x29 refcnt_finalize(ffff80002a3ef990,ffffffff83334141) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:945 pppx_if_destroy(205b9a,ffff80002a3ef988) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff8000350a9228) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002a461d50) at spec_close+0x412 VOP_CLOSE(fffffd800ab746c8,1,fffffd807f7d32d8,ffff8000350a9228) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bc9b3a0,ffff8000350a9228) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bc9b3a0,ffff8000350a9228) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bc9b3a0,ffff8000350a9228) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd806bc9b3a0,ffff8000350a9228) at closef+0x192 sys/kern/kern_descrip.c:1249 fdfree(ffff8000350a9228) at fdfree+0x116 sys/kern/kern_descrip.c:1181 exit1(ffff8000350a9228,0,0,1) at exit1+0x57f sys/kern/kern_exit.c:214 sys_exit(ffff8000350a9228,ffff80002a4620c0,ffff80002a462010) at sys_exit+0x1a end trace frame: 0xffff80002a4620b0, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 944 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8343a8fc) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833e9713,ffffffff833ececa,3b0,ffffffff833ecf12) at __assert+0x29 refcnt_finalize(ffff80002a3ef990,ffffffff83334141) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:945 pppx_if_destroy(205b9a,ffff80002a3ef988) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff8000350a9228) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002a461d50) at spec_close+0x412 VOP_CLOSE(fffffd800ab746c8,1,fffffd807f7d32d8,ffff8000350a9228) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bc9b3a0,ffff8000350a9228) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bc9b3a0,ffff8000350a9228) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bc9b3a0,ffff8000350a9228) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd806bc9b3a0,ffff8000350a9228) at closef+0x192 sys/kern/kern_descrip.c:1249 fdfree(ffff8000350a9228) at fdfree+0x116 sys/kern/kern_descrip.c:1181 exit1(ffff8000350a9228,0,0,1) at exit1+0x57f sys/kern/kern_exit.c:214 sys_exit(ffff8000350a9228,ffff80002a4620c0,ffff80002a462010) at sys_exit+0x1a syscall(ffff80002a4620c0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a4620c0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71d2d3a3bd10, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a461b20 rbx 0xffff800029a9cdc7 rdx 0 rcx 0xffff8000350a9228 rax 0xffff800029a9bff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x7f2f2ab31f5fb083 r11 0x2e69d2f992144df0 r12 0xffff800029a9cbc8 r13 0 r14 0 r15 0x1 rip 0xffffffff82e1fc05 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a461b10 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=346196 pid=5715 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000350a9228 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c4fb740,0xffff80002a38d738 process=0xffff80003c595490 user=0xffff80002a45d000, vmspace=0xfffffd806be8b1e0 estcpu=36, cpticks=5, pctcpu=0.0, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 69912 415405 13551 0 3 0x80 nanoslp syz-executor 69912 303266 13551 0 3 0x4000080 fsleep syz-executor 69912 372133 13551 0 3 0x4000000 biowait syz-executor 69912 413964 13551 0 3 0x4000080 fsleep syz-executor 55991 358537 96131 0 2 0 syz-executor 55991 166056 96131 0 7 0x4000000 syz-executor 43768 456956 33268 0 2 0 syz-executor 43768 443173 33268 0 3 0x4000080 pipewr syz-executor 5665 241055 3149 0 2 0 syz-executor 5665 220582 3149 0 3 0x4000080 ttyout syz-executor 5665 399643 3149 0 3 0x4000000 smrbar syz-executor 96131 238306 54200 0 3 0x82 nanoslp syz-executor 25555 241600 54200 0 3 0x82 nanoslp syz-executor 25670 261562 1 0 3 0x100083 ttyin getty 93951 436743 0 0 3 0x14200 acct acct 47398 301748 54200 0 3 0x82 nanoslp syz-executor 3149 16228 54200 0 3 0x82 nanoslp syz-executor 63094 192579 0 0 3 0x14280 nfsidl nfsio 81219 416235 0 0 3 0x14280 nfsidl nfsio 89776 250968 0 0 3 0x14280 nfsidl nfsio 54404 144683 0 0 3 0x14280 nfsidl nfsio 77741 348847 0 0 3 0x14280 nfsidl nfsio 21781 457003 0 0 3 0x14280 nfsidl nfsio 21172 455585 0 0 3 0x14280 nfsidl nfsio 88936 506790 0 0 3 0x14280 nfsidl nfsio 2610 141505 0 0 3 0x14280 nfsidl nfsio 92549 184513 0 0 3 0x14280 nfsidl nfsio 22738 394900 0 0 3 0x14280 nfsidl nfsio 18062 216066 0 0 3 0x14280 nfsidl nfsio 28695 146504 0 0 3 0x14280 nfsidl nfsio 49962 43704 0 0 3 0x14280 nfsidl nfsio 7878 491321 0 0 3 0x14280 nfsidl nfsio 13691 310560 0 0 3 0x14280 nfsidl nfsio 22641 129109 0 0 3 0x14280 nfsidl nfsio 41326 257107 0 0 3 0x14280 nfsidl nfsio 54468 60844 0 0 3 0x14280 nfsidl nfsio 93965 105539 0 0 3 0x14280 nfsidl nfsio 81484 401896 0 0 3 0x14200 bored sosplice 67226 366277 54200 0 3 0x82 nanoslp syz-executor 13551 210439 54200 0 3 0x82 nanoslp syz-executor 33268 406015 54200 0 3 0x82 nanoslp syz-executor 27147 29505 54200 0 3 0x82 nanoslp syz-executor 54200 160561 89552 0 3 0x82 kqread syz-executor 89552 348670 89452 0 3 0x10008a sigsusp ksh 89452 497233 92059 0 3 0x98 kqread sshd-session 92059 78832 39363 0 3 0x92 kqread sshd-session 39363 345287 1 0 3 0x88 kqread sshd 35642 291674 36041 74 3 0x1100092 bpf pflogd 36041 274218 1 0 3 0x80 sbwait pflogd 54276 515868 63960 73 3 0x1100090 kqread syslogd 63960 230251 1 0 3 0x100082 sbwait syslogd 21246 464645 1 0 3 0x100080 kqread resolvd 20702 422792 3810 77 3 0x100092 kqread dhcpleased 32963 505455 3810 77 3 0x100092 kqread dhcpleased 3810 317211 1 0 3 0x80 kqread dhcpleased 74100 410659 0 0 3 0x14200 bored smr 26294 287786 0 0 2 0x14200 zerothread 79623 460487 0 0 3 0x14200 aiodoned aiodoned 22222 450113 0 0 3 0x14200 syncer update 80944 53964 0 0 3 0x14200 cleaner cleaner 79233 31105 0 0 3 0x14200 reaper reaper 22318 40270 0 0 3 0x14200 pgdaemon pagedaemon 10827 435934 0 0 3 0x14200 bored viomb 73301 382183 0 0 3 0x40014200 acpi0 acpi0 19748 418108 0 0 3 0x40014200 idle1 50669 424339 0 0 3 0x14200 bored softnet3 33424 305223 0 0 3 0x14200 bored softnet2 78104 40648 0 0 3 0x14200 bored softnet1 519 310300 0 0 3 0x14200 bored softnet0 8922 281063 0 0 3 0x14200 bored systqmp 14334 301657 0 0 3 0x14200 bored systq 46487 348015 0 0 3 0x14200 tmoslp softclockmp 17810 137120 0 0 3 0x40014200 tmoslp softclock 63300 183251 0 0 3 0x40014200 idle0 1 287095 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 69912 (syz-executor) thread 0xffff8000ffff8a60 (372133) exclusive rrwlock inode r = 0 (0xfffffd806ddb9640) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_makeinode+0xcb sys/ufs/ufs/ufs_vnops.c:1732 #8 ufs_mknod+0x5b sys/ufs/ufs/ufs_vnops.c:167 #9 VOP_MKNOD+0x102 sys/kern/vfs_vops.c:121 #10 domknodat+0x47e sys/kern/vfs_syscalls.c:1632 #11 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #12 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806d4cd870) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #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 domknodat+0xb4 sys/kern/vfs_syscalls.c:1584 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10208 11029K 13194K 166960K 13340 0 pcb 17 17K 18K 166960K 298 0 rtable 199 9K 9K 166960K 643 0 pf 40 19K 23K 166960K 153 0 ifaddr 38 6K 7K 166960K 101 0 ifgroup 56 2K 2K 166960K 155 0 sysctl 4 1K 1K 166960K 4 0 counters 66 36K 37K 166960K 202 0 ioctlops 0 0K 4K 166960K 1697 0 iov 0 0K 24K 166960K 109 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1425 90K 90K 166960K 2692 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 25 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 53 0 dirhash 12 2K 2K 166960K 39 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 1471 0 sigio 1 0K 0K 166960K 30 0 proc 73 91K 128K 166960K 806 0 subproc 72 4K 4K 166960K 118 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 183 0 in_multi 78 5K 7K 166960K 191 0 ether_multi 1 0K 0K 166960K 8 0 mrt 1 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 115 519K 519K 166960K 115 0 exec 0 0K 1K 166960K 652 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 73K 86K 166960K 15074 0 UVM aobj 14 2K 2K 166960K 14 0 pinsyscall 43 86K 104K 166960K 2703 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 58 0 NDP 16 0K 2K 166960K 69 0 temp 79 8644K 8713K 166960K 59454 0 kqueue 14 22K 30K 166960K 239 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 24 0 0 1 0 1 1 0 8 0 rtpcb 120 225 0 157 4 1 3 3 0 8 0 rtentry 112 201 0 119 4 0 4 4 0 8 0 unpcb 144 1028 0 1006 6 2 4 4 0 8 3 syncache 336 8 0 8 3 2 1 1 0 8 1 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 808 423 0 418 16 8 8 8 0 8 7 arp 120 36 0 20 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 3 0 3 1 1 0 1 0 8 0 inpcb 376 1646 0 1634 16 8 8 11 0 8 6 nd6 136 44 0 25 1 0 1 1 0 8 0 pkpcb 40 169 0 169 4 3 1 1 0 8 1 kcovpl 48 13 0 5 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1168 53 0 52 2 1 1 1 0 8 0 pppxif 1472 2 0 1 2 1 1 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 13 0 4 1 0 1 1 0 482 0 pffrnode 88 10 0 3 1 0 1 1 0 8 0 pffrent 40 22 0 13 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 2 0 0 1 0 1 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pftag 88 3 0 0 1 0 1 1 0 8 0 pfstitem 24 118 0 28 1 0 1 1 0 8 0 pfstkey 128 121 0 32 3 0 3 3 0 8 0 pfstate 376 119 0 30 9 0 9 9 0 8 0 pfrule 1344 32 0 22 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 834 0 464 34 6 28 32 0 8 3 art_table 32 837 0 464 5 0 5 5 0 8 0 art_node 16 196 0 123 1 0 1 1 0 8 0 sysvmsgpl 40 41 0 1 1 0 1 1 0 8 0 semapl 112 51 0 41 1 0 1 1 0 8 0 shmpl 112 11 0 0 1 0 1 1 0 8 0 dirhash 1024 35 0 18 3 0 3 3 0 8 0 dino2pl 256 4160 0 2640 96 0 96 96 0 8 0 ffsino 280 4160 0 2640 109 0 109 109 0 8 0 nchpl 144 6131 0 4429 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 uvmvnodes 80 4948 0 0 101 0 101 101 0 8 0 vnodes 216 4948 0 0 275 0 275 275 0 8 0 namei 1024 21692 0 21691 3 1 2 2 0 8 1 percpumem 16 115 0 68 1 0 1 1 0 8 0 kstatmem 264 86 0 62 2 0 2 2 0 8 0 scsiplug 72 2 0 2 2 2 0 1 0 8 0 scxspl 216 22671 0 22670 12 10 2 8 1 8 1 plimitpl 152 445 0 428 1 0 1 1 0 8 0 sigapl 424 1787 0 1715 9 0 9 9 0 8 0 futexpl 64 19667 0 19665 1 0 1 1 0 8 0 knotepl 120 545 0 0 17 0 17 17 0 8 0 kqueuepl 216 444 0 433 5 4 1 5 0 8 0 pipepl 328 277 0 249 6 3 3 6 0 8 0 fdescpl 504 1746 0 1714 5 0 5 5 0 8 0 filepl 152 11697 0 11400 24 10 14 20 0 8 2 lockfpl 104 556 0 554 1 0 1 1 0 8 0 lockfspl 48 180 0 178 1 0 1 1 0 8 0 sessionpl 144 32 0 23 1 0 1 1 0 8 0 pgrppl 48 67 0 50 1 0 1 1 0 8 0 ucredpl 104 2115 0 2100 1 0 1 1 0 8 0 zombiepl 144 1719 0 1715 1 0 1 1 0 8 0 processpl 1168 1787 0 1715 6 0 6 6 0 8 0 procpl 656 3909 0 3830 8 0 8 8 0 8 0 srpgc 96 18 0 18 3 2 1 1 0 8 1 sosppl 168 9 0 9 2 1 1 1 0 8 1 sockpl 688 3145 0 3044 22 10 12 15 0 8 2 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 135 0 0 17 0 17 17 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 42 0 0 4 0 4 4 0 8 0 mtagpl 96 95 0 0 3 0 3 3 0 8 0 mbufpl 256 427 0 0 26 0 26 26 0 8 0 bufpl 280 7207 0 1053 440 0 440 440 0 8 0 anonpl 24 244462 0 240906 57 11 46 46 0 184 14 amapchunkpl 152 48464 0 47947 30 8 22 26 0 158 2 amappl16 200 5245 0 5207 37 25 12 15 0 8 8 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 131 0 119 1 0 1 1 0 8 0 amappl13 176 13 0 13 2 2 0 1 0 8 0 amappl12 168 2471 0 2439 3 1 2 2 0 8 0 amappl11 160 52 0 37 1 0 1 1 0 8 0 amappl10 152 4 0 4 2 2 0 1 0 8 0 amappl9 144 250 0 249 2 1 1 1 0 8 0 amappl8 136 29 0 25 1 0 1 1 0 8 0 amappl7 128 125 0 113 1 0 1 1 0 8 0 amappl6 120 288 0 284 1 0 1 1 0 8 0 amappl5 112 149 0 139 1 0 1 1 0 8 0 amappl4 104 353 0 335 1 0 1 1 0 8 0 amappl3 96 9958 0 9838 4 0 4 4 0 8 0 amappl2 88 750 0 686 2 0 2 2 0 8 0 amappl1 80 13052 0 12474 15 1 14 14 0 8 0 amappl 88 14565 0 14387 5 0 5 5 0 92 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 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 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 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 13 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1746 0 1714 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1746 0 1714 1 0 1 1 0 8 0 vmmpekpl 168 14549 0 14495 3 0 3 3 0 8 0 vmmpepl 168 111542 0 109597 102 8 94 95 0 357 4 vmsppl 456 1745 0 1714 6 1 5 5 0 8 0 rwobjpl 64 35619 0 29705 96 0 96 96 0 8 0 pdppl 4096 3499 0 3428 115 40 75 87 0 8 4 pvpl 32 15561 0 0 126 0 126 126 0 265 0 pmappl 248 1745 0 1714 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 342 0 63 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8383dff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff838cccb0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838cccb0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 intr_handler(ffff80002f4e48b0,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff838cccb0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838cccb0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 syscall(ffff80002f4e4a80) at syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f4e4a80) at syscall+0xae6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x49e2d0d3160, count: 5 ddb{0}> trace x86_ipi_db(ffffffff8383dff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff838cccb0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838cccb0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 intr_handler(ffff80002f4e48b0,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff838cccb0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838cccb0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 syscall(ffff80002f4e4a80) at syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f4e4a80) at syscall+0xae6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x49e2d0d3160, count: -10 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8343a8fc) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833e9713,ffffffff833ececa,3b0,ffffffff833ecf12) at __assert+0x29 refcnt_finalize(ffff80002a3ef990,ffffffff83334141) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:945 pppx_if_destroy(205b9a,ffff80002a3ef988) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff8000350a9228) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002a461d50) at spec_close+0x412 VOP_CLOSE(fffffd800ab746c8,1,fffffd807f7d32d8,ffff8000350a9228) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bc9b3a0,ffff8000350a9228) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bc9b3a0,ffff8000350a9228) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bc9b3a0,ffff8000350a9228) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd806bc9b3a0,ffff8000350a9228) at closef+0x192 sys/kern/kern_descrip.c:1249 fdfree(ffff8000350a9228) at fdfree+0x116 sys/kern/kern_descrip.c:1181 exit1(ffff8000350a9228,0,0,1) at exit1+0x57f sys/kern/kern_exit.c:214 sys_exit(ffff8000350a9228,ffff80002a4620c0,ffff80002a462010) at sys_exit+0x1a end trace frame: 0xffff80002a4620b0, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8343a8fc) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833e9713,ffffffff833ececa,3b0,ffffffff833ecf12) at __assert+0x29 refcnt_finalize(ffff80002a3ef990,ffffffff83334141) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:945 pppx_if_destroy(205b9a,ffff80002a3ef988) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff8000350a9228) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002a461d50) at spec_close+0x412 VOP_CLOSE(fffffd800ab746c8,1,fffffd807f7d32d8,ffff8000350a9228) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bc9b3a0,ffff8000350a9228) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bc9b3a0,ffff8000350a9228) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bc9b3a0,ffff8000350a9228) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd806bc9b3a0,ffff8000350a9228) at closef+0x192 sys/kern/kern_descrip.c:1249 fdfree(ffff8000350a9228) at fdfree+0x116 sys/kern/kern_descrip.c:1181 exit1(ffff8000350a9228,0,0,1) at exit1+0x57f sys/kern/kern_exit.c:214 sys_exit(ffff8000350a9228,ffff80002a4620c0,ffff80002a462010) at sys_exit+0x1a syscall(ffff80002a4620c0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a4620c0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71d2d3a3bd10, count: -16