login: panic: kernel diagnostic assertion "ifa == rt->rt_ifa" failed: file "/syzkaller/managers/multicore/kernel/sys/netinet6/nd6.c", line 947 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 499508 94200 0 0 0 1 syz-executor.1 *212176 94200 0 0 0x4000000 0K syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 __assert(ffffffff82205e21,ffffffff821fcb2f,3b3,ffffffff821bd569) at __assert+0x2b sys/kern/subr_prf.c:154 nd6_rtrequest(ffff800000b1f000,1,fffffd8065776ee8) at nd6_rtrequest+0xbb4 sys/netinet6/nd6.c:947 rtrequest(1,ffff8000237db648,1,ffff8000237db718,0) at rtrequest+0x9bf sys/net/route.c:973 rt_ifa_add(ffff800000b07900,240404,ffff800000b07958,0) at rt_ifa_add+0x290 sys/net/route.c:1133 rt_ifa_addlocal(ffff800000b07900) at rt_ifa_addlocal+0x16d sys/net/route.c:1242 in_ifinit(ffff800000b1f000,ffff800000b07900,ffff8000237dba40,0) at in_ifinit+0x1cf sys/netinet/in.c:614 in_ioctl_sifaddr(8020690c,ffff8000237dba30,ffff800000b1f000,1) at in_ioctl_sifaddr+0x208 sys/netinet/in.c:360 in_ioctl(8020690c,ffff8000237dba30,ffff800000b1f000,1) at in_ioctl+0x1e7 sys/netinet/in.c:231 ifioctl(fffffd8074b2ed88,8020690c,ffff8000237dba30,ffff800020aceef8) at ifioctl+0xb64 sys/net/if.c:2202 sys_ioctl(ffff800020aceef8,ffff8000237dbb48,ffff8000237dbb90) at sys_ioctl+0x5b9 syscall(ffff8000237dbc10) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff8000237dbc10) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff36,0,3,6a13edd71b0) at Xsyscall+0x128 end of kernel end trace frame: 0x6a415f96d40, count: 1 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic kernel diagnostic assertion "ifa == rt->rt_ifa" failed: file "/syzkaller/managers/multicore/kernel/sys/netinet6/nd6.c", line 947 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 __assert(ffffffff82205e21,ffffffff821fcb2f,3b3,ffffffff821bd569) at __assert+0x2b sys/kern/subr_prf.c:154 nd6_rtrequest(ffff800000b1f000,1,fffffd8065776ee8) at nd6_rtrequest+0xbb4 sys/netinet6/nd6.c:947 rtrequest(1,ffff8000237db648,1,ffff8000237db718,0) at rtrequest+0x9bf sys/net/route.c:973 rt_ifa_add(ffff800000b07900,240404,ffff800000b07958,0) at rt_ifa_add+0x290 sys/net/route.c:1133 rt_ifa_addlocal(ffff800000b07900) at rt_ifa_addlocal+0x16d sys/net/route.c:1242 in_ifinit(ffff800000b1f000,ffff800000b07900,ffff8000237dba40,0) at in_ifinit+0x1cf sys/netinet/in.c:614 in_ioctl_sifaddr(8020690c,ffff8000237dba30,ffff800000b1f000,1) at in_ioctl_sifaddr+0x208 sys/netinet/in.c:360 in_ioctl(8020690c,ffff8000237dba30,ffff800000b1f000,1) at in_ioctl+0x1e7 sys/netinet/in.c:231 ifioctl(fffffd8074b2ed88,8020690c,ffff8000237dba30,ffff800020aceef8) at ifioctl+0xb64 sys/net/if.c:2202 sys_ioctl(ffff800020aceef8,ffff8000237dbb48,ffff8000237dbb90) at sys_ioctl+0x5b9 syscall(ffff8000237dbc10) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff8000237dbc10) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff36,0,3,6a13edd71b0) at Xsyscall+0x128 end of kernel end trace frame: 0x6a415f96d40, count: -14 ddb{0}> show registers rdi 0xffffffff81bab4d7 db_enter+0x17 rsi 0x3d90 __ALIGN_SIZE+0x2d90 rbp 0xffff8000237db380 rbx 0xffff8000237db430 rdx 0x3d91 __ALIGN_SIZE+0x2d91 rcx 0xffff800020d46000 rax 0xffff800020d46000 r8 0xffffffff8188b28f kprintf+0x16f r9 0x1 r10 0x25 r11 0xb2cad422367240b1 r12 0x3000000008 r13 0xffff8000237db390 r14 0x100 r15 0x1 rip 0xffffffff81bab4d8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000237db370 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=212176 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020acfb50,0xffff800020acf180 process=0xffff800020adc000 user=0xffff8000237d6000, vmspace=0xfffffd806e7e6cf8 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 94200 499508 21975 0 7 0 syz-executor.1 94200 63765 21975 0 3 0x4000080 ttyin syz-executor.1 94200 63353 21975 0 2 0x4000000 syz-executor.1 *94200 212176 21975 0 7 0x4000000 syz-executor.1 94200 173192 21975 0 3 0x4000080 fsleep syz-executor.1 84422 368772 1 0 3 0x100083 ttyin getty 96077 452318 17065 0 2 0x482 syz-executor.0 21975 374895 17065 0 3 0x82 nanosleep syz-executor.1 15256 218407 0 0 3 0x14200 bored sosplice 17065 133168 89678 0 3 0x82 thrsleep syz-fuzzer 17065 463978 89678 0 3 0x4000082 thrsleep syz-fuzzer 17065 373402 89678 0 3 0x4000082 thrsleep syz-fuzzer 17065 235162 89678 0 3 0x4000082 thrsleep syz-fuzzer 17065 489925 89678 0 3 0x4000082 thrsleep syz-fuzzer 17065 370612 89678 0 3 0x4000082 thrsleep syz-fuzzer 17065 396532 89678 0 3 0x4000082 thrsleep syz-fuzzer 17065 518624 89678 0 3 0x4000082 kqread syz-fuzzer 17065 332409 89678 0 3 0x4000082 thrsleep syz-fuzzer 17065 380705 89678 0 3 0x4000082 thrsleep syz-fuzzer 89678 318237 80574 0 3 0x10008a pause ksh 80574 239088 96908 0 3 0x92 select sshd 96908 511488 1 0 3 0x80 select sshd 89574 64948 39115 74 3 0x100092 bpf pflogd 39115 51725 1 0 3 0x80 netio pflogd 38263 161724 59050 73 3 0x100090 kqread syslogd 59050 433630 1 0 3 0x100082 netio syslogd 82142 378926 1 77 3 0x100090 poll dhclient 19320 275001 1 0 3 0x80 poll dhclient 95340 206836 0 0 3 0x14200 pgzero zerothread 87010 73432 0 0 3 0x14200 aiodoned aiodoned 93104 73009 0 0 3 0x14200 syncer update 93958 216119 0 0 3 0x14200 cleaner cleaner 90328 149197 0 0 3 0x14200 reaper reaper 14463 32073 0 0 3 0x14200 pgdaemon pagedaemon 58317 497092 0 0 3 0x14200 bored crynlk 63004 324229 0 0 3 0x14200 bored crypto 55969 513283 0 0 3 0x40014200 acpi0 acpi0 57172 410455 0 0 3 0x40014200 idle1 72382 480039 0 0 3 0x14200 bored softnet 28110 388698 0 0 3 0x14200 bored systqmp 26870 379494 0 0 3 0x14200 bored systq 68816 347600 0 0 3 0x40014200 bored softclock 94626 374993 0 0 3 0x40014200 idle0 83954 324999 0 0 3 0x14200 bored smr 1 357706 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 94200 (syz-executor.1) thread 0xffff800020aceef8 (212176) exclusive rwlock netlock r = 0 (0xffffffff824e8728) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 in_ioctl_sifaddr+0x69 #2 in_ioctl+0x1e7 sys/netinet/in.c:231 #3 ifioctl+0xb64 sys/net/if.c:2202 #4 sys_ioctl+0x5b9 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8266bc58) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline] #1 syscall+0x400 sys/arch/amd64/amd64/trap.c:555 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9646 6792K 10032K 78643K 39681 0 0 pcb 13 13K 15K 78643K 1110 0 0 rtable 107 13K 14K 78643K 3706 0 0 ifaddr 97 25K 29K 78643K 1102 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1780 0 0 iov 0 0K 32K 78643K 1142 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1241 78K 78K 78643K 9895 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 82 0 0 VM map 24 12K 12K 78643K 57 0 0 sem 12 1K 1K 78643K 12 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 5487 0 0 sigio 0 0K 1K 78643K 993 0 0 proc 61 63K 83K 78643K 2388 0 0 subproc 32 2K 2K 78643K 561 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 477 0 0 in_multi 19 1K 2K 78643K 645 0 0 ether_multi 1 0K 0K 78643K 72 0 0 mrt 0 0K 0K 78643K 43 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 102 450K 450K 78643K 102 0 0 exec 0 0K 1K 78643K 1126 0 0 pfkey data 0 0K 0K 78643K 5 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 162 234K 235K 78643K 20087 0 0 UVM aobj 130 6K 6K 78643K 138 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 2K 78643K 1092 0 0 NDP 25 0K 1K 78643K 339 0 0 temp 259 3565K 4205K 78643K 179831 0 0 kqueue 0 0K 0K 78643K 45 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 149 0 144 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 501 0 499 1 0 1 1 0 8 0 rtentry 112 643 0 607 2 0 2 2 0 8 0 unpcb 120 6150 0 6135 8 7 1 2 0 8 0 syncache 264 36 0 36 11 11 0 1 0 8 0 tcpqe 32 13 0 13 8 8 0 1 0 8 0 tcpcb 544 2850 0 2846 50 49 1 13 0 8 0 inpcb 280 13033 0 13024 45 43 2 13 0 8 1 rttmr 72 14 0 14 10 10 0 1 0 8 0 nd6 48 78 0 75 1 0 1 1 0 8 0 pkpcb 40 46 0 46 13 13 0 1 0 8 0 swfcl 56 2 0 0 1 0 1 1 0 8 0 ppxss 1128 162 0 162 11 10 1 1 0 8 1 pffrag 232 429 0 421 2 1 1 1 0 482 0 pffrnode 88 414 0 412 2 1 1 1 0 8 0 pffrent 40 17199 0 17147 3 2 1 2 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 631 0 535 1 0 1 1 0 8 0 pfstkey 112 634 0 538 3 0 3 3 0 8 0 pfstate 328 634 0 536 11 2 9 9 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 9 0 8 7 6 1 3 0 8 0 art_heap4 256 2610 0 2419 36 21 15 17 0 8 2 art_table 32 2619 0 2427 3 1 2 3 0 8 0 art_node 16 641 0 607 1 0 1 1 0 8 0 sysvmsgpl 40 32 0 28 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 10 0 0 1 0 1 1 0 8 0 shmpl 112 136 0 8 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 10365 0 8941 47 0 47 47 0 8 0 ffsino 272 10365 0 8941 96 0 96 96 0 8 0 nchpl 144 18867 0 18400 61 40 21 61 0 8 0 uvmvnodes 72 6911 0 0 126 0 126 126 0 8 0 vnodes 208 6911 0 0 364 0 364 364 0 8 0 namei 1024 72336 0 72336 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 23 0 1 3 0 3 3 0 8 0 vmpool 552 55 0 33 4 2 2 2 0 8 0 scsiplug 64 1 0 1 1 1 0 1 0 8 0 scxspl 192 61386 0 61386 34 33 1 7 0 8 1 plimitpl 152 459 0 451 1 0 1 1 0 8 0 sigapl 432 5599 0 5584 3 1 2 3 0 8 0 futexpl 56 153159 0 153158 1 0 1 1 0 8 0 knotepl 112 1299 0 1280 3 2 1 2 0 8 0 kqueuepl 104 1818 0 1816 13 12 1 4 0 8 0 pipepl 112 5322 0 5303 18 17 1 2 0 8 0 fdescpl 488 5600 0 5584 3 0 3 3 0 8 0 filepl 152 61822 0 61717 64 56 8 14 0 8 3 lockfpl 104 1876 0 1875 1 0 1 1 0 8 0 lockfspl 48 650 0 649 1 0 1 1 0 8 0 sessionpl 112 54 0 43 1 0 1 1 0 8 0 pgrppl 48 116 0 105 1 0 1 1 0 8 0 ucredpl 96 8138 0 8129 1 0 1 1 0 8 0 zombiepl 144 5586 0 5585 2 1 1 1 0 8 0 processpl 896 5618 0 5585 4 0 4 4 0 8 0 procpl 632 17634 0 17588 6 1 5 5 0 8 0 srpgc 64 50 0 50 17 16 1 1 0 8 1 sosppl 128 72 0 72 18 17 1 1 0 8 1 sockpl 384 19928 0 19902 78 73 5 22 0 8 1 mcl64k 65536 335 0 0 35 24 11 34 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 25 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 13 0 0 1 0 1 1 0 8 0 mcl2k 2048 208 0 0 22 2 20 22 0 8 0 mtagpl 80 439 0 0 6 0 6 6 0 8 0 mbufpl 256 1293 0 0 62 0 62 62 0 8 0 bufpl 256 24251 0 17203 441 0 441 441 0 8 0 anonpl 16 688363 0 668630 216 128 88 97 0 124 5 amapchunkpl 152 40389 0 40247 88 82 6 20 0 158 0 amappl16 192 30480 0 29361 213 155 58 69 0 8 0 amappl15 184 573 0 573 6 6 0 1 0 8 0 amappl14 176 1052 0 1049 1 0 1 1 0 8 0 amappl13 168 1003 0 1002 6 5 1 1 0 8 0 amappl12 160 1428 0 1425 2 1 1 1 0 8 0 amappl11 152 768 0 753 1 0 1 1 0 8 0 amappl10 144 231 0 223 1 0 1 1 0 8 0 amappl9 136 1620 0 1612 1 0 1 1 0 8 0 amappl8 128 1187 0 1141 3 1 2 2 0 8 0 amappl7 120 337 0 328 1 0 1 1 0 8 0 amappl6 112 689 0 678 1 0 1 1 0 8 0 amappl5 104 1835 0 1820 1 0 1 1 0 8 0 amappl4 96 5690 0 5656 1 0 1 1 0 8 0 amappl3 88 1459 0 1452 1 0 1 1 0 8 0 amappl2 80 42804 0 42727 3 1 2 3 0 8 0 amappl1 72 134666 0 134235 24 13 11 20 0 8 0 amappl 80 18492 0 18435 3 1 2 2 0 84 0 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 17 0 17 1 1 0 1 0 8 0 aobjpl 64 137 0 8 3 0 3 3 0 8 0 uaddrrnd 24 5655 0 5584 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5655 0 5584 1 0 1 1 0 8 0 vmmpekpl 168 53273 0 53229 3 0 3 3 0 8 0 vmmpepl 168 720992 0 718675 301 157 144 150 0 357 34 vmsppl 368 5599 0 5584 2 0 2 2 0 8 0 pdppl 4096 11317 0 11256 11 2 9 9 0 8 1 pvpl 32 1829877 0 1807155 398 186 212 223 0 265 22 pmappl 232 5654 0 5617 4 1 3 3 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 779 0 107 20 0 20 20 0 8 0