panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 955 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b3b42) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f159a,ffffffff833fd2b1,3bb,ffffffff8342776d) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff8000317c6350,ffffffff833a99aa) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff8000317c6348) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff8000fffe8550) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800039ff1f70) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80621e3a80,81,fffffd80097fd618,ffff8000fffe8550) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c984e00,ffff8000fffe8550) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c984e00,ffff8000fffe8550) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c984e00,ffff8000fffe8550) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c984e00,ffff8000fffe8550) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000fffe8550) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000fffe8550,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffe8550,ffff800039ff22e0,ffff800039ff2230) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff800039ff22d0, 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 955 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b3b42) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f159a,ffffffff833fd2b1,3bb,ffffffff8342776d) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff8000317c6350,ffffffff833a99aa) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff8000317c6348) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff8000fffe8550) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800039ff1f70) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80621e3a80,81,fffffd80097fd618,ffff8000fffe8550) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c984e00,ffff8000fffe8550) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c984e00,ffff8000fffe8550) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c984e00,ffff8000fffe8550) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c984e00,ffff8000fffe8550) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000fffe8550) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000fffe8550,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffe8550,ffff800039ff22e0,ffff800039ff2230) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800039ff22e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039ff22e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x789c006155a0, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800039ff1d40 rbx 0xffff8000299dee07 rdx 0 rcx 0xffff8000fffe8550 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x48b6f2c209cd0429 r11 0xbd6f88222f87c542 r12 0xffff8000299dec08 r13 0 r14 0 r15 0x1 rip 0xffffffff82a1f875 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800039ff1d30 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=366008 pid=88610 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=70, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000fffe8550 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000fffe7250,0xffff8000fffe8d28 process=0xffff800037bdf040 user=0xffff800039fed000, vmspace=0xfffffd806c993b88 estcpu=20, cpticks=9, pctcpu=0.8, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 58874 190838 20626 0 2 0 syz-executor 58874 422400 20626 0 3 0x4000080 kqread syz-executor 62293 334834 4970 0 3 0x80 nanoslp syz-executor 62293 25765 4970 0 3 0x4000000 smrbar syz-executor 57050 483675 0 0 3 0x14200 acct acct 77109 186976 44609 0 3 0x82 sysctllk sshd-session 87718 256513 1 0 3 0x82 sysctllk getty 28189 503269 16867 0 3 0 vmmapbsy syz-executor 28189 350249 16867 0 3 0x4000000 vmmapbsy syz-executor 28189 86310 16867 0 3 0x4000000 fltagain2 syz-executor 28189 99867 16867 0 3 0x4000000 fltagain2 syz-executor 4970 26761 58512 0 3 0x82 nanoslp syz-executor 75652 77217 58512 0 2 0xc82 syz-executor 26341 154263 58512 0 2 0x2 syz-executor 20626 359267 58512 0 3 0x82 nanoslp syz-executor 39321 462476 58512 0 3 0x82 nanoslp syz-executor 46972 242361 58512 0 2 0x2 syz-executor 85814 291477 58512 0 3 0x82 nanoslp syz-executor 16867 492855 58512 0 3 0x82 wait syz-executor 58512 465609 66036 0 3 0x82 kqread syz-executor 66036 204562 44797 0 3 0x10008a sigsusp ksh 44797 96266 23419 0 3 0x98 kqread sshd-session 23419 110909 44609 0 3 0x92 kqread sshd-session 44609 79794 1 0 3 0x88 kqread sshd 81979 452126 40719 74 3 0x1100092 bpf pflogd 40719 470582 1 0 3 0x80 sbwait pflogd 26935 309407 7373 73 3 0x1100090 kqread syslogd 7373 243570 1 0 3 0x100082 sbwait syslogd 44667 236877 1 0 3 0x100080 kqread resolvd 32868 225322 68262 77 3 0x100092 kqread dhcpleased 91558 350645 68262 77 3 0x100092 kqread dhcpleased 68262 165125 1 0 3 0x80 kqread dhcpleased 10469 429890 0 0 3 0x14200 bored smr 47713 130235 0 0 2 0x14200 zerothread 98774 182809 0 0 3 0x14200 aiodoned aiodoned 90012 156254 0 0 3 0x14200 syncer update 31340 88292 0 0 3 0x14200 cleaner cleaner 48721 499161 0 0 3 0x14200 reaper reaper 74467 86841 0 0 3 0x14200 pgdaemon pagedaemon 7879 480371 0 0 3 0x14200 bored viomb 69216 92344 0 0 3 0x40014200 acpi0 acpi0 31629 507827 0 0 3 0x40014200 idle1 60646 266564 0 0 3 0x14200 bored softnet1 1773 480634 0 0 3 0x14200 bored softnet0 1962 253240 0 0 3 0x14200 bored systqmp 97025 68072 0 0 3 0x14200 bored systq 23723 505315 0 0 3 0x14200 tmoslp softclockmp 69950 457031 0 0 3 0x40014200 tmoslp softclock 5 452989 0 0 3 0x40014200 idle0 1 411852 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 28189 (syz-executor) thread 0xffff8000fffe82b8 (350249) exclusive rrwlock inode r = 0 (0xfffffd806c735330) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 28189 (syz-executor) thread 0xffff80002a2602b0 (99867) exclusive rwlock sysctllk r = 0 (0xffffffff838383f8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 sysctl_vslock+0x45 sys/kern/kern_sysctl.c:191 #3 kern_sysctl+0xd17 sys/kern/kern_sysctl.c:726 #4 sys_sysctl+0x3e5 sys/kern/kern_sysctl.c:-1 #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 Process 46972 (syz-executor) thread 0xffff8000ffffd9f8 (242361) exclusive rrwlock inode r = 0 (0xfffffd8063de9b50) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3113 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd807c7c3448) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11069 12089K 12370K 166960K 12533 0 pcb 17 16K 21K 166960K 215 0 rtable 205 7K 8K 166960K 381 0 pf 42 19K 19K 166960K 114 0 ifaddr 41 6K 8K 166960K 67 0 ifgroup 58 2K 2K 166960K 95 0 sysctl 1 1K 9K 166960K 7 0 counters 80 37K 37K 166960K 124 0 ioctlops 0 0K 4K 166960K 1573 0 iov 0 0K 24K 166960K 20 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1345 85K 85K 166960K 1586 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 11 0K 0K 166960K 15 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 240K 166960K 459 0 sigio 0 0K 0K 166960K 8 0 proc 63 99K 164K 166960K 574 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 0 0K 0K 166960K 35 0 in_multi 81 5K 7K 166960K 113 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 488 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 252 156K 169K 166960K 6148 0 UVM aobj 10 8K 10K 166960K 13 0 pinsyscall 43 86K 103K 166960K 1579 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 26 0 NDP 14 0K 2K 166960K 45 0 temp 42 8671K 8751K 166960K 18518 0 kqueue 13 20K 30K 166960K 67 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 44 0 41 1 0 1 1 0 8 0 rtentry 176 120 0 30 6 0 6 6 0 8 0 unpcb 144 265 0 245 4 2 2 4 0 8 1 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpcb 736 113 0 107 1 0 1 1 0 8 0 arp 136 20 0 5 1 0 1 1 0 8 0 inpcb 328 478 0 466 13 11 2 13 0 8 0 nd6 152 26 0 6 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 25 0 19 1 0 1 1 0 8 0 pppxif 1504 2 0 1 2 1 1 1 0 8 0 pfstscr 40 4 0 4 1 0 1 1 0 8 1 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 1 0 0 1 0 1 1 0 8 0 pfstkey 128 4 0 4 1 0 1 1 0 8 1 pfstate 448 2 0 2 1 0 1 1 0 8 1 pfrule 1360 35 0 34 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 480 0 108 29 3 26 29 0 8 0 art_table 40 481 0 108 5 0 5 5 0 8 0 art_node 32 120 0 39 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 13 0 4 1 0 1 1 0 8 0 shmpl 112 6 0 2 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2204 0 690 96 0 96 96 0 8 0 ffsino 296 2204 0 690 118 0 118 118 0 8 0 nchpl 144 2839 0 1130 64 0 64 64 0 8 0 rtmask 32 5 0 4 2 1 1 1 0 8 0 vnodes 216 2371 0 0 132 0 132 132 0 8 0 namei 1024 8927 0 8926 1 0 1 1 0 8 0 percpumem 16 77 0 22 1 0 1 1 0 8 0 vcpupl 3968 3 0 0 1 0 1 1 0 8 0 vmpool 848 4 0 1 1 0 1 1 0 8 0 kstatmem 264 60 0 30 3 1 2 3 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 20954 0 20954 9 8 1 8 1 8 1 plimitpl 152 169 0 151 1 0 1 1 0 8 0 sigapl 424 758 0 709 7 1 6 7 0 8 0 knotepl 120 375 0 0 12 0 12 12 0 8 0 kqueuepl 224 189 0 177 5 4 1 5 0 8 0 pipepl 344 149 0 121 3 0 3 3 0 8 0 fdescpl 528 740 0 709 3 0 3 3 0 8 0 filepl 160 3856 0 3629 16 4 12 16 0 8 1 lockfpl 104 119 0 117 1 0 1 1 0 8 0 lockfspl 48 47 0 45 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 40 0 23 1 0 1 1 0 8 0 ucredpl 104 471 0 456 1 0 1 1 0 8 0 zombiepl 144 713 0 709 1 0 1 1 0 8 0 processpl 1232 758 0 709 5 0 5 5 0 8 0 procpl 664 1407 0 1353 7 0 7 7 0 8 1 sosppl 176 2 0 2 1 1 0 1 0 8 0 sockpl 752 807 0 772 18 11 7 18 0 8 2 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 110 0 0 14 0 14 14 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 180 0 0 12 0 12 12 0 8 0 bufpl 280 9155 0 3019 439 0 439 439 0 8 0 anonpl 32 11652 0 0 94 0 94 94 0 246 0 amapchunkpl 152 19130 0 18631 31 1 30 30 0 158 6 amappl16 200 3405 0 3327 31 15 16 22 0 8 8 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 5 0 5 1 1 0 1 0 8 0 amappl13 176 425 0 424 1 0 1 1 0 8 0 amappl12 168 1104 0 1063 3 0 3 3 0 8 0 amappl11 160 22 0 22 1 1 0 1 0 8 0 amappl10 152 58 0 44 1 0 1 1 0 8 0 amappl9 144 258 0 258 1 1 0 1 0 8 0 amappl8 136 25 0 22 1 0 1 1 0 8 0 amappl7 128 82 0 81 1 0 1 1 0 8 0 amappl6 120 278 0 263 1 0 1 1 0 8 0 amappl5 112 227 0 215 1 0 1 1 0 8 0 amappl4 104 422 0 394 1 0 1 1 0 8 0 amappl3 96 3207 0 3119 4 1 3 3 0 8 0 amappl2 88 861 0 780 2 0 2 2 0 8 0 amappl1 80 10433 0 9822 14 0 14 14 0 8 0 amappl 88 5388 0 5220 6 0 6 6 0 92 1 uvmvnodes 80 114 0 0 3 0 3 3 0 8 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 128 254 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 2 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 12 0 3 1 0 1 1 0 8 0 uaddrrnd 24 740 0 709 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 740 0 709 1 0 1 1 0 8 0 vmmpekpl 168 7918 0 7872 3 0 3 3 0 8 0 vmmpepl 168 55518 0 53540 107 0 107 107 0 357 8 vmsppl 488 739 0 708 5 0 5 5 0 8 0 rwobjpl 80 18581 0 17457 33 2 31 31 0 8 3 pdppl 4096 1495 0 1421 100 24 76 83 0 8 2 pvpl 32 22251 0 0 180 0 180 180 0 265 0 pmappl 256 743 0 709 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 273 0 31 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff838b7ff0) 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(ffffffff83975900) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83975900) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff83975900) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83975900) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 exit1(ffff80002a260fa8,0,0,1) at exit1+0x701 sys/kern/kern_exit.c:260 sys_exit(ffff80002a260fa8,ffff80003a004870,ffff80003a0047c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003a004870) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a004870) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x782d08565be0, count: 2 ddb{0}> trace x86_ipi_db(ffffffff838b7ff0) 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(ffffffff83975900) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83975900) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff83975900) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83975900) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 exit1(ffff80002a260fa8,0,0,1) at exit1+0x701 sys/kern/kern_exit.c:260 sys_exit(ffff80002a260fa8,ffff80003a004870,ffff80003a0047c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003a004870) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a004870) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x782d08565be0, count: -13 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(ffffffff833b3b42) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f159a,ffffffff833fd2b1,3bb,ffffffff8342776d) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff8000317c6350,ffffffff833a99aa) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff8000317c6348) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff8000fffe8550) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800039ff1f70) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80621e3a80,81,fffffd80097fd618,ffff8000fffe8550) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c984e00,ffff8000fffe8550) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c984e00,ffff8000fffe8550) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c984e00,ffff8000fffe8550) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c984e00,ffff8000fffe8550) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000fffe8550) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000fffe8550,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffe8550,ffff800039ff22e0,ffff800039ff2230) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff800039ff22d0, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b3b42) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f159a,ffffffff833fd2b1,3bb,ffffffff8342776d) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff8000317c6350,ffffffff833a99aa) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff8000317c6348) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff8000fffe8550) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800039ff1f70) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80621e3a80,81,fffffd80097fd618,ffff8000fffe8550) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c984e00,ffff8000fffe8550) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c984e00,ffff8000fffe8550) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c984e00,ffff8000fffe8550) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c984e00,ffff8000fffe8550) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000fffe8550) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000fffe8550,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffe8550,ffff800039ff22e0,ffff800039ff2230) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800039ff22e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039ff22e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x789c006155a0, count: -16