panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 951 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 311044 92993 0 0 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8346f295) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834187de,ffffffff83421bc7,3b7,ffffffff83421c4a) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003a80ef08,ffffffff8335dacb) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80003a80ef00) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,2,2000,ffff80003c4507d8) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003c469320) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8068c8e2a8,2,fffffd80097fb750,ffff80003c4507d8) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8068c96888,ffff80003c4507d8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8068c96888,ffff80003c4507d8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8068c96888,ffff80003c4507d8) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd8068c96888,ffff80003c4507d8) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003c4507d8) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003c4507d8,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003c4507d8,ffff80003c469690,ffff80003c4695e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c469680, 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 951 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8346f295) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834187de,ffffffff83421bc7,3b7,ffffffff83421c4a) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003a80ef08,ffffffff8335dacb) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80003a80ef00) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,2,2000,ffff80003c4507d8) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003c469320) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8068c8e2a8,2,fffffd80097fb750,ffff80003c4507d8) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8068c96888,ffff80003c4507d8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8068c96888,ffff80003c4507d8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8068c96888,ffff80003c4507d8) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd8068c96888,ffff80003c4507d8) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003c4507d8) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003c4507d8,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003c4507d8,ffff80003c469690,ffff80003c4695e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c469690) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c469690) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7127fa893c10, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c4690f0 rbx 0xffff8000299dedd7 rdx 0 rcx 0xffff80003c4507d8 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x807270838543a431 r11 0x1e86a98665dd049d r12 0xffff8000299debd8 r13 0 r14 0 r15 0x1 rip 0xffffffff81305215 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c4690e0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=130088 pid=8832 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=79, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c4507d8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000ffff2a50,0xffff80002a297220 process=0xffff80002a302200 user=0xffff80003c464000, vmspace=0xfffffd806c009b60 estcpu=29, cpticks=3, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 77254 41586 15974 0 2 0 syz-executor 77254 43566 15974 0 3 0x4000080 fsleep syz-executor 68453 438260 93408 60929 3 0x90 nanoslp syz-executor 68453 155367 93408 60929 3 0x4000090 ttyretype syz-executor 69435 84981 23508 0 2 0 syz-executor 7837 284026 71163 0 3 0x80 nanoslp syz-executor 7837 428544 71163 0 2 0x4000000 syz-executor 7837 350459 71163 0 3 0x4000080 fsleep syz-executor 92993 311044 67262 0 7 0 syz-executor 92993 293008 67262 0 3 0x4000000 biowait syz-executor 92993 307495 67262 0 3 0x4000000 inode syz-executor 92993 185989 67262 0 3 0x4000000 inode syz-executor 94883 56840 48495 0 3 0x80 nanoslp syz-executor 94883 343078 48495 0 3 0x4000080 kqsel syz-executor 94883 485251 48495 0 3 0x4000080 fsleep syz-executor 6923 248321 69084 0 3 0x82 nanoslp syz-executor 48495 420276 69084 0 3 0x82 nanoslp syz-executor 12875 22613 69084 0 3 0x2 biowait syz-executor 67262 178526 69084 0 3 0x82 nanoslp syz-executor 71163 25638 69084 0 3 0x82 nanoslp syz-executor 15974 378659 69084 0 3 0x82 nanoslp syz-executor 93408 79153 69084 0 3 0x82 nanoslp syz-executor 23508 38228 69084 0 3 0x82 nanoslp syz-executor 69084 146314 59743 0 3 0x82 kqread syz-executor 59743 332519 87662 0 3 0x10008a sigsusp ksh 87662 466757 91469 0 3 0x98 kqread sshd-session 91469 31776 96528 0 3 0x92 kqread sshd-session 36850 521933 1 0 3 0x100083 ttyin getty 96528 48131 1 0 3 0x88 kqread sshd 97057 61248 84500 74 3 0x1100092 bpf pflogd 84500 459463 1 0 3 0x80 sbwait pflogd 99585 102555 20625 73 3 0x1100090 kqread syslogd 20625 289245 1 0 3 0x100082 sbwait syslogd 39206 235427 1 0 2 0x100000 resolvd 72156 243803 91858 77 3 0x100092 kqread dhcpleased 95098 500351 91858 77 3 0x100092 kqread dhcpleased 91858 14449 1 0 3 0x80 kqread dhcpleased 24326 42283 0 0 3 0x14200 bored smr 81353 96906 0 0 2 0x14200 zerothread 49786 446498 0 0 3 0x14200 aiodoned aiodoned 64235 346276 0 0 3 0x14200 syncer update 71754 61239 0 0 3 0x14200 cleaner cleaner 37649 21922 0 0 3 0x14200 reaper reaper 18949 48644 0 0 3 0x14200 pgdaemon pagedaemon 82517 441974 0 0 3 0x14200 bored viomb 74243 405039 0 0 3 0x40014200 acpi0 acpi0 16259 187825 0 0 3 0x40014200 idle1 11903 485897 0 0 3 0x14200 bored softnet3 30653 403459 0 0 3 0x14200 bored softnet2 90875 106604 0 0 3 0x14200 bored softnet1 11610 354135 0 0 2 0x14200 softnet0 13887 193728 0 0 3 0x14200 bored systqmp 95957 245742 0 0 3 0x14200 bored systq 4217 466259 0 0 3 0x14200 tmoslp softclockmp 21897 515705 0 0 3 0x40014200 tmoslp softclock 36148 219148 0 0 3 0x40014200 idle0 1 347402 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 92993 (syz-executor) thread 0xffff80002a296540 (293008) exclusive rrwlock inode r = 0 (0xfffffd8067d07be0) #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:742 #9 Xsyscall+0x128 Process 92993 (syz-executor) thread 0xffff80003c450f88 (307495) exclusive rrwlock inode r = 0 (0xfffffd8067d07640) #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 domkdirat+0x8b sys/kern/vfs_syscalls.c:3094 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 #9 Xsyscall+0x128 Process 12875 (syz-executor) thread 0xffff8000ffffcf68 (22613) exclusive rrwlock inode r = 0 (0xfffffd806e102770) #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 vget+0x2bd sys/kern/vfs_subr.c:693 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c6c7c18) #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 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 #9 Xsyscall+0x128 Process 11610 (softnet0) thread 0xffff8000ffffea40 (354135) 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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10199 11087K 11429K 166960K 11410 0 pcb 18 13K 14K 166960K 69 0 rtable 236 7K 7K 166960K 354 0 pf 34 17K 18K 166960K 50 0 ifaddr 43 7K 8K 166960K 49 0 ifgroup 55 2K 2K 166960K 64 0 sysctl 1 1K 9K 166960K 5 0 counters 70 37K 37K 166960K 84 0 ioctlops 0 0K 4K 166960K 1490 0 iov 0 0K 4K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1376 87K 87K 166960K 1412 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 166 0 sigio 0 0K 0K 166960K 3 0 proc 70 91K 128K 166960K 532 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 3 0K 0K 166960K 5 0 in_multi 100 7K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 43 201K 201K 166960K 43 0 exec 0 0K 1K 166960K 372 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 235 159K 169K 166960K 3181 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 42 84K 106K 166960K 1249 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 3 0 NDP 12 0K 2K 166960K 30 0 temp 36 8682K 8750K 166960K 6529 0 kqueue 15 24K 30K 166960K 39 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 33 0 30 1 0 1 1 0 8 0 rtentry 176 113 0 3 6 0 6 6 0 8 1 unpcb 144 117 0 100 4 0 4 4 0 8 3 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 19 0 14 1 0 1 1 0 8 0 arp 128 18 0 0 1 0 1 1 0 8 0 inpcb 328 123 0 111 4 0 4 4 0 8 2 nd6 144 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 6 0 5 1 0 1 1 0 8 0 pppxif 1504 6 0 5 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 16 0 0 1 0 1 1 0 8 0 pfstkey 128 16 0 0 1 0 1 1 0 8 0 pfstate 384 16 0 0 2 0 2 2 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 458 0 6 29 0 29 29 0 8 0 art_table 32 459 0 6 4 0 4 4 0 8 0 art_node 16 111 0 11 1 0 1 1 0 8 0 semapl 112 3 0 0 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1623 0 105 95 0 95 95 0 8 0 ffsino 288 1623 0 105 109 0 109 109 0 8 0 nchpl 144 1845 0 149 63 0 63 63 0 8 0 uvmvnodes 80 1749 0 0 36 0 36 36 0 8 0 vnodes 216 1749 0 0 98 0 98 98 0 8 0 namei 1024 5681 0 5679 2 0 2 2 0 8 1 percpumem 16 57 0 7 1 0 1 1 0 8 0 kstatmem 264 30 0 4 2 0 2 2 0 8 0 scxspl 216 6475 0 6473 3 1 2 2 1 8 1 plimitpl 152 33 0 14 1 0 1 1 0 8 0 sigapl 424 465 0 416 7 0 7 7 0 8 1 knotepl 120 274 0 0 9 0 9 9 0 8 0 kqueuepl 224 45 0 30 2 0 2 2 0 8 0 pipepl 336 106 0 79 3 0 3 3 0 8 0 fdescpl 520 447 0 416 3 0 3 3 0 8 0 filepl 160 1753 0 1520 14 0 14 14 0 8 3 lockfpl 104 95 0 88 2 0 2 2 0 8 0 lockfspl 48 50 0 43 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 108 0 94 1 0 1 1 0 8 0 zombiepl 144 417 0 416 1 0 1 1 0 8 0 processpl 1240 465 0 416 5 0 5 5 0 8 1 procpl 656 530 0 472 6 0 6 6 0 8 0 sockpl 728 273 0 241 12 0 12 12 0 8 8 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 128 0 0 16 0 16 16 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 152 0 0 10 0 10 10 0 8 0 bufpl 280 2576 0 122 176 0 176 176 0 8 0 anonpl 32 3946 0 0 32 0 32 32 0 246 0 amapchunkpl 152 9005 0 8535 22 0 22 22 0 158 2 amappl16 200 1802 0 1747 5 1 4 5 0 8 1 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 113 0 101 1 0 1 1 0 8 0 amappl13 176 4 0 4 1 1 0 1 0 8 0 amappl12 168 1088 0 1058 2 0 2 2 0 8 0 amappl11 160 52 0 38 1 0 1 1 0 8 0 amappl10 152 79 0 79 1 1 0 1 0 8 0 amappl9 144 262 0 262 1 1 0 1 0 8 0 amappl8 136 26 0 24 1 0 1 1 0 8 0 amappl7 128 105 0 93 1 0 1 1 0 8 0 amappl6 120 182 0 179 1 0 1 1 0 8 0 amappl5 112 124 0 115 1 0 1 1 0 8 0 amappl4 104 318 0 297 1 0 1 1 0 8 0 amappl3 96 1412 0 1308 4 0 4 4 0 8 0 amappl2 88 629 0 568 2 0 2 2 0 8 0 amappl1 80 8299 0 7697 15 0 15 15 0 8 1 amappl 88 2504 0 2341 5 0 5 5 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 447 0 416 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 447 0 416 1 0 1 1 0 8 0 vmmpekpl 168 5485 0 5446 2 0 2 2 0 8 0 vmmpepl 168 35069 0 33089 94 0 94 94 0 357 3 vmsppl 480 446 0 416 5 0 5 5 0 8 0 rwobjpl 72 14318 0 11621 50 0 50 50 0 8 0 pdppl 4096 902 0 832 102 28 74 86 0 8 4 pvpl 32 10172 0 0 83 0 83 83 0 265 0 pmappl 256 446 0 416 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 383 0 30 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8385cff0) 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(ffffffff838d9040) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838d9040) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 intr_handler(ffff80003c4314a0,ffff800000079a80) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x705ea90b2220, count: 8 ddb{0}> trace x86_ipi_db(ffffffff8385cff0) 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(ffffffff838d9040) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838d9040) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 intr_handler(ffff80003c4314a0,ffff800000079a80) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x705ea90b2220, count: -7 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(ffffffff8346f295) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834187de,ffffffff83421bc7,3b7,ffffffff83421c4a) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003a80ef08,ffffffff8335dacb) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80003a80ef00) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,2,2000,ffff80003c4507d8) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003c469320) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8068c8e2a8,2,fffffd80097fb750,ffff80003c4507d8) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8068c96888,ffff80003c4507d8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8068c96888,ffff80003c4507d8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8068c96888,ffff80003c4507d8) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd8068c96888,ffff80003c4507d8) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003c4507d8) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003c4507d8,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003c4507d8,ffff80003c469690,ffff80003c4695e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c469680, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8346f295) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834187de,ffffffff83421bc7,3b7,ffffffff83421c4a) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003a80ef08,ffffffff8335dacb) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80003a80ef00) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,2,2000,ffff80003c4507d8) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003c469320) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8068c8e2a8,2,fffffd80097fb750,ffff80003c4507d8) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8068c96888,ffff80003c4507d8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8068c96888,ffff80003c4507d8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8068c96888,ffff80003c4507d8) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd8068c96888,ffff80003c4507d8) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003c4507d8) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003c4507d8,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003c4507d8,ffff80003c469690,ffff80003c4695e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c469690) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c469690) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7127fa893c10, count: -16