panic: kernel diagnostic assertion "!ISSET(rt->rt_flags, RTF_LOCAL)" failed: file "/syzkaller/managers/main/kernel/sys/netinet6/nd6.c", line 728 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821da0c7) at panic+0x15c sys/kern/subr_prf.c:207 __assert(ffffffff8222d6ec,ffffffff8220eab4,2d8,ffffffff82214604) at __assert+0x2b sys/kern/subr_prf.c:154 nd6_free(fffffd805666e548) at nd6_free+0x1cf sys/netinet6/nd6.c:728 nd6_purge(ffff800000a02800) at nd6_purge+0x10f sys/netinet6/nd6.c:535 in6_ifdetach(ffff800000a02800) at in6_ifdetach+0xa7 sys/netinet6/in6_ifattach.c:432 if_detach(ffff800000a02800) at if_detach+0x148 sys/net/if.c:1152 tun_clone_destroy(ffff800000a02800) at tun_clone_destroy+0x1d8 sys/net/if_tun.c:329 tun_dev_close(5d01,7) at tun_dev_close+0x160 sys/net/if_tun.c:480 spec_close(ffff80001e8343f0) at spec_close+0x311 sys/kern/spec_vnops.c:555 VOP_CLOSE(fffffd80678f2c30,7,fffffd806c3bfa20,ffff80001d739008) at VOP_CLOSE+0xc0 sys/kern/vfs_vops.c:174 vn_closefile(fffffd80567d2d30,ffff80001d739008) at vn_closefile+0xd2 vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffd80567d2d30,ffff80001d739008) at vn_closefile+0xd2 sys/kern/vfs_vnops.c:614 fdrop(fffffd80567d2d30,ffff80001d739008) at fdrop+0xc2 sys/kern/kern_descrip.c:1276 closef(fffffd80567d2d30,ffff80001d739008) at closef+0x117 sys/kern/kern_descrip.c:1260 end trace frame: 0xffff80001e8345c0, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic kernel diagnostic assertion "!ISSET(rt->rt_flags, RTF_LOCAL)" failed: file "/syzkaller/managers/main/kernel/sys/netinet6/nd6.c", line 728 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821da0c7) at panic+0x15c sys/kern/subr_prf.c:207 __assert(ffffffff8222d6ec,ffffffff8220eab4,2d8,ffffffff82214604) at __assert+0x2b sys/kern/subr_prf.c:154 nd6_free(fffffd805666e548) at nd6_free+0x1cf sys/netinet6/nd6.c:728 nd6_purge(ffff800000a02800) at nd6_purge+0x10f sys/netinet6/nd6.c:535 in6_ifdetach(ffff800000a02800) at in6_ifdetach+0xa7 sys/netinet6/in6_ifattach.c:432 if_detach(ffff800000a02800) at if_detach+0x148 sys/net/if.c:1152 tun_clone_destroy(ffff800000a02800) at tun_clone_destroy+0x1d8 sys/net/if_tun.c:329 tun_dev_close(5d01,7) at tun_dev_close+0x160 sys/net/if_tun.c:480 spec_close(ffff80001e8343f0) at spec_close+0x311 sys/kern/spec_vnops.c:555 VOP_CLOSE(fffffd80678f2c30,7,fffffd806c3bfa20,ffff80001d739008) at VOP_CLOSE+0xc0 sys/kern/vfs_vops.c:174 vn_closefile(fffffd80567d2d30,ffff80001d739008) at vn_closefile+0xd2 vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffd80567d2d30,ffff80001d739008) at vn_closefile+0xd2 sys/kern/vfs_vnops.c:614 fdrop(fffffd80567d2d30,ffff80001d739008) at fdrop+0xc2 sys/kern/kern_descrip.c:1276 closef(fffffd80567d2d30,ffff80001d739008) at closef+0x117 sys/kern/kern_descrip.c:1260 fdfree(ffff80001d739008) at fdfree+0x100 sys/kern/kern_descrip.c:1192 exit1(ffff80001d739008,0,19,1) at exit1+0x32c sys/kern/kern_exit.c:197 postsig(ffff80001d739008,19) at postsig+0x4b2 sigexit sys/kern/kern_sig.c:1483 [inline] postsig(ffff80001d739008,19) at postsig+0x4b2 sys/kern/kern_sig.c:1415 userret(ffff80001d739008) at userret+0x159 sys/kern/kern_sig.c:1867 syscall(ffff80001e834870) at syscall+0x42e mi_syscall_return sys/sys/syscall_mi.h:129 [inline] syscall(ffff80001e834870) at syscall+0x42e sys/arch/amd64/amd64/trap.c:592 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffef5b0, count: -20 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001e834060 rbx 0xffff80001e834110 rdx 0x2 rcx 0 rax 0 r8 0xffff80001e834020 r9 0x1 r10 0 r11 0xaa2ddfcf80db8e45 r12 0x3000000008 r13 0xffff80001e834070 r14 0x100 r15 0x1 rip 0xffffffff817e2fa8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e834050 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=331454 stat=onproc flags process=a proc=2000 pri=32, usrpri=74, nice=20 forw=0xffffffffffffffff, list=0xffff80001d7394e8,0xffff80001d73a878 process=0xffff8000ffffae70 user=0xffff80001e82f000, vmspace=0xfffffd806bc0a880 estcpu=36, cpticks=1, pctcpu=0.1 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 43057 70011 99355 0 3 0x2 biowait syz-executor.0 96078 293705 0 0 3 0x14200 bored sosplice 99355 507062 35810 0 3 0x82 thrsleep syz-fuzzer 99355 470044 35810 0 3 0x4000082 nanosleep syz-fuzzer 99355 450286 35810 0 3 0x4000082 thrsleep syz-fuzzer 99355 462780 35810 0 3 0x4000082 thrsleep syz-fuzzer 99355 52450 35810 0 3 0x4000082 thrsleep syz-fuzzer 99355 152038 35810 0 3 0x4000082 kqread syz-fuzzer 99355 80856 35810 0 3 0x4000082 thrsleep syz-fuzzer 99355 218314 35810 0 3 0x4000082 thrsleep syz-fuzzer 35810 319565 2247 0 3 0x10008a pause ksh 2247 232617 1697 0 3 0x92 select sshd 97836 208352 1 0 3 0x100083 ttyin getty 1697 373656 1 0 3 0x80 select sshd 32850 105478 53678 73 3 0x100090 kqread syslogd 53678 20328 1 0 3 0x100082 netio syslogd 53036 457614 1 77 3 0x100090 poll dhclient 65190 160393 1 0 3 0x80 poll dhclient 13625 11573 0 0 3 0x14200 bored smr 36482 346829 0 0 3 0x14200 pgzero zerothread 81098 14262 0 0 3 0x14200 aiodoned aiodoned 36651 277017 0 0 3 0x14200 syncer update 72798 5061 0 0 3 0x14200 cleaner cleaner 81531 422716 0 0 3 0x14200 reaper reaper 85160 446538 0 0 3 0x14200 pgdaemon pagedaemon 47529 77441 0 0 3 0x14200 bored crynlk 37102 501764 0 0 3 0x14200 bored crypto 69075 459113 0 0 3 0x40014200 acpi0 acpi0 19497 483259 0 0 3 0x14200 bored softnet 43088 335805 0 0 2 0x14200 systqmp 251 69989 0 0 3 0x14200 bored systq 4835 383678 0 0 3 0x40014200 bored softclock 23249 147580 0 0 3 0x40014200 idle0 1 261400 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9482 6336K 6977K 78643K 11510 0 pcb 13 8K 8K 78643K 129 0 rtable 70 2K 3K 78643K 305 0 ifaddr 52 10K 13K 78643K 102 0 counters 20 16K 16K 78643K 25 0 ioctlops 0 0K 2K 78643K 27 0 iov 0 0K 12K 78643K 46 0 mount 1 1K 1K 78643K 1 0 vnodes 1218 77K 77K 78643K 1503 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 5 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 21 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 4 9K 25K 78643K 277 0 sigio 0 0K 0K 78643K 4 0 proc 51 38K 55K 78643K 417 0 subproc 23 1K 2K 78643K 51 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 32 0 in_multi 41 2K 3K 78643K 114 0 ether_multi 1 0K 0K 78643K 11 0 mrt 0 0K 0K 78643K 6 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 43 201K 201K 78643K 43 0 exec 0 0K 1K 78643K 198 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 125 39K 55K 78643K 1519 0 UVM aobj 22 4K 4K 78643K 22 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 54 0 NDP 9 0K 0K 78643K 22 0 temp 77 3032K 3097K 78643K 6365 0 kqueue 3 4K 12K 78643K 29 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 9 0 7 1 0 1 1 0 8 0 rtpcb 80 31 0 29 1 0 1 1 0 8 0 rtentry 112 73 0 48 2 0 2 2 0 8 0 unpcb 120 171 0 163 1 0 1 1 0 8 0 syncache 264 9 0 9 2 1 1 1 0 8 1 tcpqe 32 152 0 152 2 1 1 1 0 8 1 tcpcb 544 123 0 118 1 0 1 1 0 8 0 inpcb 280 406 0 398 2 0 2 2 0 8 1 rttmr 72 3 0 3 1 1 0 1 0 8 0 nd6 48 11 0 10 1 0 1 1 0 8 0 ppxss 1128 3 0 3 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 295 0 158 13 0 13 13 0 8 3 art_table 32 297 0 158 2 0 2 2 0 8 0 art_node 16 72 0 43 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 18 0 8 1 0 1 1 0 8 0 shmpl 112 20 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1747 0 352 88 0 88 88 0 8 0 ffsino 240 1747 0 352 83 0 83 83 0 8 0 nchpl 144 2318 0 732 60 0 60 60 0 8 0 uvmvnodes 72 2025 0 0 37 0 37 37 0 8 0 vnodes 208 2025 0 0 107 0 107 107 0 8 0 namei 1024 6480 0 6479 1 0 1 1 0 8 0 vcpupl 1984 1 0 0 1 0 1 1 0 8 0 vmpool 528 3 0 2 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 0 1 1 0 8 1 scxspl 192 6797 0 6796 1 0 1 1 0 8 0 plimitpl 152 49 0 42 1 0 1 1 0 8 0 sigapl 424 461 0 433 4 0 4 4 0 8 0 futexpl 56 5454 0 5454 1 0 1 1 0 8 1 knotepl 112 97 0 80 1 0 1 1 0 8 0 kqueuepl 144 86 0 84 1 0 1 1 0 8 0 pipelkpl 16 91 0 82 1 0 1 1 0 8 0 pipepl 120 182 0 165 1 0 1 1 0 8 0 fdescpl 432 446 0 433 2 0 2 2 0 8 0 filepl 120 2868 0 2784 4 0 4 4 0 8 1 lockfpl 104 47 0 46 1 0 1 1 0 8 0 lockfspl 48 22 0 21 1 0 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 22 0 12 1 0 1 1 0 8 0 ucredpl 96 339 0 332 1 0 1 1 0 8 0 zombiepl 144 434 0 433 1 0 1 1 0 8 0 processpl 920 461 0 433 4 0 4 4 0 8 0 procpl 624 743 0 708 4 0 4 4 0 8 1 sosppl 128 7 0 7 1 0 1 1 0 8 1 sockpl 400 611 0 593 5 1 4 4 0 8 1 mcl64k 65536 37 0 37 1 0 1 1 0 8 1 mcl12k 12288 6 0 6 1 0 1 1 0 8 1 mcl9k 9216 5 0 5 2 1 1 1 0 8 1 mcl8k 8192 2 0 2 2 1 1 1 0 8 1 mcl4k 4096 24 0 24 2 1 1 1 0 8 1 mcl2k2 2112 3 0 3 2 1 1 1 0 8 1 mcl2k 2048 58218 0 58164 17 8 9 14 0 8 1 mtagpl 80 116 0 116 3 1 2 2 0 8 2 mbufpl 256 94299 0 94224 22 2 20 20 0 8 6 bufpl 280 4570 0 186 314 0 314 314 0 8 0 anonpl 16 65859 0 51968 77 1 76 76 0 107 13 amapchunkpl 152 3347 0 3213 20 4 16 20 0 158 10 amappl16 192 2485 0 1625 57 7 50 54 0 8 6 amappl15 184 9 0 7 1 0 1 1 0 8 0 amappl14 176 28 0 21 1 0 1 1 0 8 0 amappl13 168 37 0 36 1 0 1 1 0 8 0 amappl12 160 15 0 10 2 1 1 1 0 8 0 amappl11 152 67 0 56 1 0 1 1 0 8 0 amappl10 144 120 0 115 1 0 1 1 0 8 0 amappl9 136 477 0 475 1 0 1 1 0 8 0 amappl8 128 442 0 406 2 0 2 2 0 8 0 amappl7 120 213 0 202 1 0 1 1 0 8 0 amappl6 112 40 0 32 1 0 1 1 0 8 0 amappl5 104 391 0 381 1 0 1 1 0 8 0 amappl4 96 445 0 420 1 0 1 1 0 8 0 amappl3 88 114 0 109 1 0 1 1 0 8 0 amappl2 80 2702 0 2644 3 1 2 3 0 8 0 amappl1 72 17822 0 17414 26 16 10 20 0 8 0 amappl 80 1007 0 965 3 1 2 2 0 84 1 dma4096 4096 1 0 1 1 1 0 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 64 21 0 0 1 0 1 1 0 8 0 uaddrrnd 24 449 0 435 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 449 0 435 1 0 1 1 0 8 0 vmmpekpl 168 6801 0 6773 2 0 2 2 0 8 0 vmmpepl 168 61153 0 59308 135 16 119 119 0 357 32 vmsppl 272 448 0 435 2 0 2 2 0 8 1 pdppl 4096 904 0 871 6 1 5 6 0 8 0 pvpl 32 190992 0 174172 180 0 180 180 0 265 30 pmappl 200 448 0 435 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 254 0 16 7 0 7 7 0 8 0