kernel: protection fault trap, code=0 Stopped at bpfdetach+0x70: movq 0(%r15),%r12 ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace bpfdetach(ffff80000159f000) at bpfdetach+0x70 sys/net/bpf.c:1770 if_detach(ffff80000159f000) at if_detach+0x12b sys/net/if.c:1288 tun_clone_destroy(ffff80000159f000) at tun_clone_destroy+0x2ce sys/net/if_tun.c:347 if_clone_destroy(ffff8000383de430) at if_clone_destroy+0x205 sys/net/if.c:1478 ifioctl(ffff8000015af4a8,80206979,ffff8000383de430,ffff80003c426558) at ifioctl+0x59d sys/net/if.c:2159 sys_ioctl(ffff80003c426558,ffff8000383de610,ffff8000383de560) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff8000383de610) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000383de610) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd0019655af0, count: -8 ddb{0}> show registers rdi 0xffff8000327c7000 rsi 0x196c0 acpi_pdirpa+0x5531 rbp 0xffff8000383de250 rbx 0x80206979 __kernel_virt_to_phys+0x206979 rdx 0xffff8000327c7000 rcx 0x196bf acpi_pdirpa+0x5530 rax 0xffffffff8297a3f9 bpfdetach+0xb9 r8 0xfffffd806b46e900 r9 0 r10 0xffff8000383de110 r11 0x670e7f648c2fdf50 r12 0xdeaf0002deafbead r13 0xffff80000159f600 r14 0xffff80000159f000 r15 0xdeaf0002deafbead rip 0xffffffff8297a3b0 bpfdetach+0x70 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000383de220 ss 0x10 bpfdetach+0x70: movq 0(%r15),%r12 ddb{0}> show proc PROC (syz-executor) tid=417246 pid=70501 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c427250,0xffff80003c4274f8 process=0xffff80003c410e90 user=0xffff8000383d9000, vmspace=0xfffffd806b85f018 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 90121 478670 92465 0 2 0 syz-executor 90121 30790 92465 0 2 0x4000000 syz-executor 75526 202268 60217 0 3 0x80 nanoslp syz-executor 75526 305242 60217 0 3 0x4000080 lockf syz-executor 75526 135683 60217 0 3 0x4000080 fsleep syz-executor 70501 519458 57698 0 3 0x80 nanoslp syz-executor 70501 165021 57698 0 3 0x4000080 kqsel syz-executor *70501 417246 57698 0 7 0x4000000 syz-executor 94543 213300 26229 0 3 0x80 nanoslp syz-executor 94543 446361 26229 0 3 0x4000080 pppxread syz-executor 94543 244631 26229 0 3 0x4000080 fsleep syz-executor 84533 310880 89870 0 2 0x2 syz-executor 60217 372439 89870 0 3 0x82 nanoslp syz-executor 40710 62983 89870 0 3 0x82 nanoslp syz-executor 3942 387964 89870 0 3 0x82 wait syz-executor 57698 90159 89870 0 3 0x82 nanoslp syz-executor 26229 6965 89870 0 3 0x82 nanoslp syz-executor 92465 459224 89870 0 3 0x82 nanoslp syz-executor 27638 152637 89870 0 2 0x2 syz-executor 89870 462939 20810 0 3 0x82 kqread syz-executor 20810 120608 48288 0 3 0x10008a sigsusp ksh 48288 98138 24595 0 3 0x98 kqread sshd-session 24595 220506 66321 0 3 0x92 kqread sshd-session 32331 144116 1 0 3 0x100083 ttyin getty 66321 501283 1 0 3 0x88 kqread sshd 25973 450402 70961 74 3 0x1100092 bpf pflogd 70961 368415 1 0 3 0x80 sbwait pflogd 81108 68042 35712 73 3 0x1100090 kqread syslogd 35712 277039 1 0 3 0x100082 sbwait syslogd 59293 240289 1 0 3 0x100080 kqread resolvd 7559 67344 33715 77 3 0x100092 kqread dhcpleased 55077 26099 33715 77 3 0x100092 kqread dhcpleased 33715 409841 1 0 3 0x80 kqread dhcpleased 89655 420178 0 0 3 0x14200 bored smr 47386 226182 0 0 3 0x14200 pgzero zerothread 16665 326282 0 0 3 0x14200 aiodoned aiodoned 13795 302838 0 0 3 0x14200 syncer update 25235 384514 0 0 3 0x14200 cleaner cleaner 28371 95700 0 0 3 0x14200 reaper reaper 54283 168020 0 0 3 0x14200 pgdaemon pagedaemon 92299 304446 0 0 3 0x14200 bored viomb 34657 119847 0 0 3 0x40014200 acpi0 acpi0 19266 356593 0 0 3 0x40014200 idle1 57405 472732 0 0 3 0x14200 bored softnet1 67715 66133 0 0 2 0x14200 softnet0 89708 239162 0 0 3 0x14200 bored systqmp 87053 112393 0 0 3 0x14200 bored systq 77913 323433 0 0 3 0x14200 tmoslp softclockmp 94274 344813 0 0 3 0x40014200 tmoslp softclock 67092 390754 0 0 3 0x40014200 idle0 1 303523 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 70501 (syz-executor) thread 0xffff80003c426558 (417246) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83952040) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 sleep_finish+0x2d8 sys/kern/kern_synch.c:369 #3 rw_do_enter_write+0x1dc sys/kern/kern_rwlock.c:298 #4 bpf_detachd+0x1c2 sys/net/bpf.c:345 #5 bpfclose+0x101 sys/net/bpf.c:417 #6 spec_close+0x466 sys/kern/spec_vnops.c:-1 #7 VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 #8 vclean+0x20f sys/kern/vfs_subr.c:1083 #9 vgonel+0xb0 sys/kern/vfs_subr.c:1185 #10 vop_generic_revoke+0x3ea sys/kern/vfs_default.c:124 #11 VOP_REVOKE+0x65 sys/kern/vfs_vops.c:291 #12 vdevgone+0x17b sys/kern/vfs_subr.c:-1 #13 bpfsdetach+0x155 sys/net/bpf.c:1794 #14 bpfdetach+0xa6 sys/net/bpf.c:-1 #15 if_detach+0x12b sys/net/if.c:1288 #16 tun_clone_destroy+0x2ce sys/net/if_tun.c:347 #17 if_clone_destroy+0x205 sys/net/if.c:1478 #18 ifioctl+0x59d sys/net/if.c:2159 exclusive rwlock clonelk r = 0 (0xffffffff837d9a78) #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 if_clone_destroy+0x93 sys/net/if.c:-1 #3 ifioctl+0x59d sys/net/if.c:2159 #4 sys_ioctl+0x674 sys/kern/sys_generic.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 84533 (syz-executor) thread 0xffff80002a262d08 (310880) exclusive rrwlock inode r = 0 (0xfffffd806e860a58) #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 vget+0x2a2 sys/kern/vfs_subr.c:686 #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+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806cd9b200) #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 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #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 Process 27638 (syz-executor) thread 0xffff80002a284548 (152637) exclusive rrwlock inode r = 0 (0xfffffd806e81ded8) #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 vget+0x2a2 sys/kern/vfs_subr.c:686 #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+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b67c6a8) #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 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 cache_lookup+0x351 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #10 namei+0x7ca sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #13 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11077 12205K 12442K 166960K 12501 0 pcb 17 12K 12K 166960K 71 0 rtable 243 9K 9K 166960K 406 0 pf 36 17K 20K 166960K 61 0 ifaddr 43 7K 7K 166960K 60 0 ifgroup 57 2K 2K 166960K 77 0 sysctl 3 1K 9K 166960K 10 0 counters 74 37K 38K 166960K 112 0 ioctlops 0 0K 4K 166960K 1580 0 iov 0 0K 16K 166960K 23 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1377 87K 87K 166960K 1613 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 8 0K 0K 166960K 12 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 89K 166960K 403 0 sigio 0 0K 0K 166960K 3 0 proc 73 115K 164K 166960K 569 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 175 0 in_multi 95 7K 7K 166960K 122 0 ether_multi 1 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 416 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 236 151K 161K 166960K 5392 0 UVM aobj 9 8K 8K 166960K 9 0 pinsyscall 41 82K 102K 166960K 1530 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 16 0 NDP 13 0K 1K 166960K 40 0 temp 40 8675K 8750K 166960K 7800 0 kqueue 13 20K 32K 166960K 90 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 54 0 51 1 0 1 1 0 8 0 rtentry 176 115 0 9 6 0 6 6 0 8 0 unpcb 144 299 0 282 6 5 1 6 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 62 0 58 1 0 1 1 0 8 0 arp 136 19 0 1 1 0 1 1 0 8 0 inpcb 328 283 0 273 3 1 2 2 0 8 0 nd6 152 24 0 2 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 21 0 19 1 0 1 1 0 8 0 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 2 0 0 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 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 465 0 18 29 0 29 29 0 8 0 art_table 40 467 0 18 5 0 5 5 0 8 0 art_node 32 115 0 18 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 2 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 10 0 4 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2127 0 611 95 0 95 95 0 8 0 ffsino 296 2127 0 611 117 0 117 117 0 8 0 nchpl 144 2704 0 990 64 0 64 64 0 8 0 rtmask 32 5 0 5 2 1 1 1 0 8 1 vnodes 216 2348 0 0 131 0 131 131 0 8 0 namei 1024 8902 0 8902 2 1 1 1 0 8 1 percpumem 16 71 0 19 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 48 0 20 4 1 3 3 0 8 0 scsiplug 72 4 0 4 2 1 1 1 0 8 1 scxspl 216 9267 0 9267 5 4 1 3 1 8 1 plimitpl 152 64 0 45 1 0 1 1 0 8 0 sigapl 424 716 0 670 7 1 6 7 0 8 0 knotepl 120 546 0 0 17 0 17 17 0 8 0 kqueuepl 224 124 0 113 3 1 2 2 0 8 0 pipepl 344 142 0 114 3 0 3 3 0 8 0 fdescpl 528 696 0 666 3 0 3 3 0 8 0 filepl 160 3582 0 3352 16 5 11 16 0 8 1 lockfpl 104 103 0 98 1 0 1 1 0 8 0 lockfspl 48 48 0 45 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 33 0 16 1 0 1 1 0 8 0 ucredpl 104 330 0 317 1 0 1 1 0 8 0 zombiepl 144 672 0 670 1 0 1 1 0 8 0 processpl 1232 716 0 670 5 0 5 5 0 8 0 procpl 664 1206 0 1153 6 0 6 6 0 8 0 sosppl 176 5 0 5 1 1 0 1 0 8 0 sockpl 752 646 0 616 18 14 4 18 0 8 0 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 147 0 0 10 0 10 10 0 8 0 bufpl 280 3374 0 134 232 0 232 232 0 8 0 anonpl 32 7577 0 0 62 0 62 62 0 246 0 amapchunkpl 152 17099 0 16628 30 3 27 27 0 158 6 amappl16 200 2699 0 2669 17 13 4 15 0 8 0 amappl15 192 8 0 8 2 2 0 1 0 8 0 amappl14 184 4 0 4 1 1 0 1 0 8 0 amappl13 176 425 0 424 1 0 1 1 0 8 0 amappl12 168 1057 0 1016 3 0 3 3 0 8 0 amappl11 160 29 0 29 1 1 0 1 0 8 0 amappl10 152 56 0 40 1 0 1 1 0 8 0 amappl9 144 309 0 309 1 1 0 1 0 8 0 amappl8 136 28 0 26 1 0 1 1 0 8 0 amappl7 128 106 0 105 1 0 1 1 0 8 0 amappl6 120 277 0 264 1 0 1 1 0 8 0 amappl5 112 78 0 67 1 0 1 1 0 8 0 amappl4 104 412 0 383 1 0 1 1 0 8 0 amappl3 96 2856 0 2766 3 0 3 3 0 8 0 amappl2 88 807 0 732 2 0 2 2 0 8 0 amappl1 80 10057 0 9457 15 2 13 15 0 8 0 amappl 88 4624 0 4465 5 0 5 5 0 92 0 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 128 255 0 255 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 8 0 0 1 0 1 1 0 8 0 uaddrrnd 24 696 0 666 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 696 0 666 1 0 1 1 0 8 0 vmmpekpl 168 7413 0 7373 3 0 3 3 0 8 0 vmmpepl 168 51606 0 49721 98 9 89 97 0 357 1 vmsppl 488 695 0 666 5 1 4 5 0 8 0 rwobjpl 80 16928 0 15870 27 3 24 27 0 8 0 pdppl 4096 1405 0 1335 101 27 74 83 0 8 4 pvpl 32 13877 0 0 114 2 112 112 0 265 0 pmappl 256 698 0 666 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 272 0 31 7 0 7 7 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace bpfdetach(ffff80000159f000) at bpfdetach+0x70 sys/net/bpf.c:1770 if_detach(ffff80000159f000) at if_detach+0x12b sys/net/if.c:1288 tun_clone_destroy(ffff80000159f000) at tun_clone_destroy+0x2ce sys/net/if_tun.c:347 if_clone_destroy(ffff8000383de430) at if_clone_destroy+0x205 sys/net/if.c:1478 ifioctl(ffff8000015af4a8,80206979,ffff8000383de430,ffff80003c426558) at ifioctl+0x59d sys/net/if.c:2159 sys_ioctl(ffff80003c426558,ffff8000383de610,ffff8000383de560) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff8000383de610) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000383de610) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd0019655af0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp 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(ffffffff83951840) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83951840) at __mp_lock+0x192 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff83951840,2) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 rw_do_enter_write(ffffffff837d9b58,0) at rw_do_enter_write+0x1dc sys/kern/kern_rwlock.c:298 if_detach(ffff8000015a1000) at if_detach+0x140 sys/net/if.c:1289 pppacclose(6384,81,2000,ffff80003c4274e8) at pppacclose+0x118 sys/net/if_pppx.c:1329 spec_close(ffff80003c47cde0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805f4cb060,81,fffffd80097fd4e0,ffff80003c4274e8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b0bd7e8,ffff80003c4274e8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b0bd7e8,ffff80003c4274e8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b0bd7e8,ffff80003c4274e8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b0bd7e8,ffff80003c4274e8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c4274e8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c4274e8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c4274e8,ffff80003c47d150,ffff80003c47d0a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c47d150) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c47d150) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f38a36c9510, count: -19