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 *388425 11918 0 0 0x4000000 0K syz-executor.0 294427 65482 0 0x14000 0x200 1 systqmp 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(ffffffff822095f0,ffffffff821ff4b4,3b3,ffffffff821c15d6) at __assert+0x2b sys/kern/subr_prf.c:154 nd6_rtrequest(ffff800000bef000,1,fffffd807dee4078) at nd6_rtrequest+0xbb4 sys/netinet6/nd6.c:947 rtrequest(1,ffff800024bd70f8,1,ffff800024bd71c8,0) at rtrequest+0x9bf sys/net/route.c:973 rt_ifa_add(ffff800000b33400,240404,ffff800000b33458,0) at rt_ifa_add+0x290 sys/net/route.c:1133 rt_ifa_addlocal(ffff800000b33400) at rt_ifa_addlocal+0x16d sys/net/route.c:1242 in_ifinit(ffff800000bef000,ffff800000b33400,ffff800024bd74f0,0) at in_ifinit+0x1cf sys/netinet/in.c:645 in_ioctl_sifaddr(8020690c,ffff800024bd74e0,ffff800000bef000,1) at in_ioctl_sifaddr+0x208 sys/netinet/in.c:372 in_ioctl(8020690c,ffff800024bd74e0,ffff800000bef000,1) at in_ioctl+0x1e7 sys/netinet/in.c:243 ifioctl(fffffd8065ee9618,8020690c,ffff800024bd74e0,ffff800020acf168) at ifioctl+0xb64 sys/net/if.c:2202 sys_ioctl(ffff800020acf168,ffff800024bd75f8,ffff800024bd7640) at sys_ioctl+0x5b9 syscall(ffff800024bd76c0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024bd76c0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff36,0,3,40d55061010) at Xsyscall+0x128 end of kernel end trace frame: 0x4105347eb20, 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(ffffffff822095f0,ffffffff821ff4b4,3b3,ffffffff821c15d6) at __assert+0x2b sys/kern/subr_prf.c:154 nd6_rtrequest(ffff800000bef000,1,fffffd807dee4078) at nd6_rtrequest+0xbb4 sys/netinet6/nd6.c:947 rtrequest(1,ffff800024bd70f8,1,ffff800024bd71c8,0) at rtrequest+0x9bf sys/net/route.c:973 rt_ifa_add(ffff800000b33400,240404,ffff800000b33458,0) at rt_ifa_add+0x290 sys/net/route.c:1133 rt_ifa_addlocal(ffff800000b33400) at rt_ifa_addlocal+0x16d sys/net/route.c:1242 in_ifinit(ffff800000bef000,ffff800000b33400,ffff800024bd74f0,0) at in_ifinit+0x1cf sys/netinet/in.c:645 in_ioctl_sifaddr(8020690c,ffff800024bd74e0,ffff800000bef000,1) at in_ioctl_sifaddr+0x208 sys/netinet/in.c:372 in_ioctl(8020690c,ffff800024bd74e0,ffff800000bef000,1) at in_ioctl+0x1e7 sys/netinet/in.c:243 ifioctl(fffffd8065ee9618,8020690c,ffff800024bd74e0,ffff800020acf168) at ifioctl+0xb64 sys/net/if.c:2202 sys_ioctl(ffff800020acf168,ffff800024bd75f8,ffff800024bd7640) at sys_ioctl+0x5b9 syscall(ffff800024bd76c0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024bd76c0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff36,0,3,40d55061010) at Xsyscall+0x128 end of kernel end trace frame: 0x4105347eb20, count: -14 ddb{0}> show registers rdi 0xffffffff812f5887 db_enter+0x17 rsi 0xa6ca __ALIGN_SIZE+0x96ca rbp 0xffff800024bd6e30 rbx 0xffff800024bd6ee0 rdx 0xa6cb __ALIGN_SIZE+0x96cb rcx 0xffff800021b6c000 rax 0xffff800021b6c000 r8 0xffffffff8158fadf kprintf+0x16f r9 0x1 r10 0x25 r11 0x9e24eb8710f8c56f r12 0x3000000008 r13 0xffff800024bd6e40 r14 0x100 r15 0x1 rip 0xffffffff812f5888 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024bd6e20 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=388425 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ace020,0xffffffff82648f88 process=0xffff800020adce00 user=0xffff800024bd2000, vmspace=0xfffffd807f00b450 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 11918 369591 20659 0 2 0 syz-executor.0 *11918 388425 20659 0 7 0x4000000 syz-executor.0 20659 110951 75961 0 2 0x482 syz-executor.0 84479 32314 1 0 3 0x100083 ttyin getty 66971 131196 75961 0 2 0x2 syz-executor.1 26375 291699 0 0 3 0x14200 acct acct 41192 330129 0 0 3 0x14200 bored sosplice 75961 369391 72701 0 3 0x82 thrsleep syz-fuzzer 75961 484508 72701 0 2 0x4000482 syz-fuzzer 75961 10956 72701 0 3 0x4000082 thrsleep syz-fuzzer 75961 208458 72701 0 3 0x4000082 thrsleep syz-fuzzer 75961 417484 72701 0 3 0x4000082 thrsleep syz-fuzzer 75961 196991 72701 0 2 0x4000482 syz-fuzzer 75961 171079 72701 0 3 0x4000082 thrsleep syz-fuzzer 75961 375109 72701 0 3 0x4000082 thrsleep syz-fuzzer 75961 209179 72701 0 3 0x4000082 thrsleep syz-fuzzer 75961 327759 72701 0 3 0x4000082 thrsleep syz-fuzzer 75961 377784 72701 0 3 0x4000082 kqread syz-fuzzer 72701 120354 29630 0 3 0x10008a pause ksh 29630 361959 22913 0 3 0x92 select sshd 22913 202250 1 0 3 0x80 select sshd 64281 302033 77798 74 3 0x100092 bpf pflogd 77798 416203 1 0 3 0x80 netio pflogd 80418 237753 51061 73 3 0x100090 kqread syslogd 51061 402289 1 0 3 0x100082 netio syslogd 39498 503307 1 77 3 0x100090 poll dhclient 43015 70091 1 0 3 0x80 poll dhclient 77474 114422 0 0 3 0x14200 pgzero zerothread 41356 371465 0 0 3 0x14200 aiodoned aiodoned 46117 501746 0 0 3 0x14200 syncer update 49852 94854 0 0 3 0x14200 cleaner cleaner 84923 7227 0 0 3 0x14200 reaper reaper 30332 354760 0 0 3 0x14200 pgdaemon pagedaemon 15378 255700 0 0 3 0x14200 bored crynlk 83939 428690 0 0 3 0x14200 bored crypto 13145 508091 0 0 3 0x40014200 acpi0 acpi0 85240 83099 0 0 3 0x40014200 idle1 72486 28330 0 0 3 0x14200 bored softnet 65482 294427 0 0 7 0x14200 systqmp 84519 263473 0 0 3 0x14200 bored systq 25562 14520 0 0 3 0x40014200 bored softclock 80608 196581 0 0 3 0x40014200 idle0 94274 65591 0 0 3 0x14200 bored smr 1 25495 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 11918 (syz-executor.0) thread 0xffff800020acf168 (388425) exclusive rwlock netlock r = 0 (0xffffffff82489ec8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 in_ioctl_sifaddr+0x69 #2 in_ioctl+0x1e7 sys/netinet/in.c:243 #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 (0xffffffff82676a88) #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 Process 66971 (syz-executor.1) thread 0xffff800020acf658 (131196) exclusive rrwlock inode r = 0 (0xfffffd806e153f80) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x447 sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x13e sys/ufs/ffs/ffs_vfsops.c:1352 #5 ffs_inode_alloc+0x1cf sys/ufs/ffs/ffs_alloc.c:392 #6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1164 #7 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 #8 domkdirat+0x121 sys/kern/vfs_syscalls.c:2983 #9 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #9 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8070db9708) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x447 sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:574 #5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419 #6 namei+0x63c sys/kern/vfs_lookup.c:249 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:2968 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9665 6493K 8006K 78643K 33108 0 0 pcb 13 12K 14K 78643K 1685 0 0 rtable 119 14K 14K 78643K 4644 0 0 ifaddr 107 26K 29K 78643K 1421 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1876 0 0 iov 0 0K 32K 78643K 1433 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1222 77K 77K 78643K 10553 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 9K 78643K 115 0 0 VM map 57 28K 29K 78643K 86 0 0 sem 12 0K 0K 78643K 3379 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 7421 0 0 sigio 0 0K 0K 78643K 81 0 0 proc 62 63K 95K 78643K 2920 0 0 subproc 32 2K 2K 78643K 777 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 1K 78643K 722 0 0 in_multi 25 1K 2K 78643K 882 0 0 ether_multi 1 0K 0K 78643K 88 0 0 mrt 2 0K 0K 78643K 44 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 234 1033K 1033K 78643K 234 0 0 exec 0 0K 1K 78643K 1561 0 0 pfkey data 0 0K 0K 78643K 2 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 207 480K 485K 78643K 27146 0 0 UVM aobj 130 9K 9K 78643K 133 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 1K 78643K 1658 0 0 NDP 26 0K 1K 78643K 440 0 0 temp 270 3566K 4201K 78643K 179240 0 0 kqueue 0 0K 0K 78643K 74 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 64 130 0 126 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 635 0 633 1 0 1 1 0 8 0 rtentry 112 743 0 701 2 0 2 2 0 8 0 unpcb 120 3980 0 3961 6 5 1 2 0 8 0 syncache 264 38 0 38 19 19 0 1 0 8 0 tcpqe 32 65 0 65 9 9 0 1 0 8 0 tcpcb 544 3600 0 3596 33 32 1 13 0 8 0 inpcb 280 10306 0 10298 39 37 2 13 0 8 1 rttmr 72 14 0 13 1 0 1 1 0 8 0 ip6q 72 7 0 7 4 4 0 1 0 8 0 ip6af 40 16 0 16 4 4 0 1 0 8 0 nd6 48 119 0 116 4 3 1 1 0 8 0 pkpcb 40 78 0 78 20 19 1 1 0 8 1 swfcl 56 1 0 0 1 0 1 1 0 8 0 ppxss 1128 216 0 216 16 15 1 1 0 8 1 pffrag 232 202 0 202 17 16 1 1 0 482 1 pffrnode 88 202 0 202 17 16 1 1 0 8 1 pffrent 40 6245 0 6245 17 16 1 1 0 8 1 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 24 675 0 587 1 0 1 1 0 8 0 pfstkey 112 675 0 587 5 2 3 3 0 8 0 pfstate 328 675 0 587 13 5 8 9 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 29 0 25 18 13 5 5 0 8 1 art_heap4 256 3287 0 3018 43 23 20 20 0 8 1 art_table 32 3316 0 3043 3 0 3 3 0 8 0 art_node 16 742 0 699 1 0 1 1 0 8 0 sysvmsgpl 40 22 0 15 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 3377 0 3367 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 14016 0 12592 47 0 47 47 0 8 0 ffsino 272 14016 0 12592 96 0 96 96 0 8 0 nchpl 144 26990 0 26512 61 41 20 61 0 8 0 uvmvnodes 72 6306 0 0 115 0 115 115 0 8 0 vnodes 208 6306 0 0 332 0 332 332 0 8 0 namei 1024 115370 0 115369 5 4 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 57 0 2 7 0 7 7 0 8 0 vmpool 552 84 0 29 5 1 4 5 0 8 0 scsiplug 64 3 0 3 3 2 1 1 0 8 1 scxspl 192 77536 0 77536 46 42 4 7 0 8 4 plimitpl 152 638 0 630 1 0 1 1 0 8 0 sigapl 432 7494 0 7479 3 1 2 3 0 8 0 futexpl 56 174285 0 174285 3 2 1 1 0 8 1 knotepl 112 2085 0 2066 9 7 2 3 0 8 1 kqueuepl 104 2191 0 2189 8 7 1 4 0 8 0 pipepl 112 4266 0 4247 5 4 1 2 0 8 0 fdescpl 488 7495 0 7479 3 0 3 3 0 8 0 filepl 152 84181 0 84080 53 47 6 14 0 8 1 lockfpl 104 2662 0 2661 1 0 1 1 0 8 0 lockfspl 48 931 0 930 1 0 1 1 0 8 0 sessionpl 112 63 0 52 1 0 1 1 0 8 0 pgrppl 48 220 0 209 1 0 1 1 0 8 0 ucredpl 96 29516 0 29506 1 0 1 1 0 8 0 zombiepl 144 7480 0 7480 2 1 1 1 0 8 1 processpl 896 7513 0 7480 4 0 4 4 0 8 0 procpl 632 24138 0 24094 5 0 5 5 0 8 0 srpgc 64 74 0 74 21 20 1 1 0 8 1 sosppl 128 121 0 121 24 24 0 1 0 8 0 sockpl 384 15122 0 15093 75 70 5 23 0 8 1 mcl64k 65536 641 0 0 71 40 31 65 0 8 0 mcl16k 16384 27 0 0 4 2 2 3 0 8 0 mcl12k 12288 42 0 0 2 0 2 2 0 8 0 mcl9k 9216 25 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 4 1 3 3 0 8 0 mcl4k 4096 25 0 0 3 0 3 3 0 8 0 mcl2k2 2112 10 0 0 1 0 1 1 0 8 0 mcl2k 2048 200 0 0 21 5 16 21 0 8 0 mtagpl 80 95 0 0 1 0 1 1 0 8 0 mbufpl 256 1017 0 0 38 0 38 38 0 8 0 bufpl 256 28436 0 21388 441 0 441 441 0 8 0 anonpl 16 876463 0 855706 252 165 87 102 0 124 1 amapchunkpl 152 54804 0 54653 56 46 10 20 0 158 0 amappl16 192 40622 0 39431 266 204 62 72 0 8 2 amappl15 184 1497 0 1495 5 4 1 1 0 8 0 amappl14 176 892 0 889 1 0 1 1 0 8 0 amappl13 168 1015 0 1015 6 6 0 1 0 8 0 amappl12 160 523 0 521 2 1 1 1 0 8 0 amappl11 152 1564 0 1549 1 0 1 1 0 8 0 amappl10 144 893 0 884 1 0 1 1 0 8 0 amappl9 136 1668 0 1661 1 0 1 1 0 8 0 amappl8 128 1236 0 1185 2 0 2 2 0 8 0 amappl7 120 1109 0 1099 1 0 1 1 0 8 0 amappl6 112 1480 0 1461 1 0 1 1 0 8 0 amappl5 104 1005 0 991 1 0 1 1 0 8 0 amappl4 96 8222 0 8187 1 0 1 1 0 8 0 amappl3 88 574 0 564 1 0 1 1 0 8 0 amappl2 80 58183 0 58112 3 1 2 3 0 8 0 amappl1 72 178472 0 178016 26 16 10 21 0 8 0 amappl 80 25160 0 25088 2 0 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 64 132 0 3 3 0 3 3 0 8 0 uaddrrnd 24 7579 0 7479 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 7579 0 7479 1 0 1 1 0 8 0 vmmpekpl 168 56765 0 56711 4 1 3 3 0 8 0 vmmpepl 168 963523 0 961048 366 214 152 153 0 357 32 vmsppl 368 7494 0 7479 2 0 2 2 0 8 0 pdppl 4096 15165 0 15071 13 0 13 13 0 8 0 pvpl 32 2337217 0 2314117 498 290 208 228 0 265 16 pmappl 232 7578 0 7508 6 1 5 5 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 799 0 123 20 0 20 20 0 8 0