panic: kernel diagnostic assertion "rt->rt_ifa->ifa_ifp != NULL" failed: fWAiRlNeI NG":/ sSyPzLka NlOlTe rL/OmWaEnRaEgDe rOsN/ muSlYtSiCAcoLLr e/3 k4e rnEeXIlT/ s0y s9/ n eStopped at savectx+0xb1: movl $0,%gs:0x530 TID PID UID PRFLAGS PFLAGS CPU COMMAND 315208 98819 0 0 0x4000000 0 syz-executor.1 *165271 58557 74 0x100012 0 1 pflogd savectx(6,0,734fdf47eb0,3,73212103b16,7341cb98000) at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffbd7b0, count: 14 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 kernel diagnostic assertion "rt->rt_ifa->ifa_ifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/route.c", line 848 ddb{1}> trace savectx(6,0,734fdf47eb0,3,73212103b16,7341cb98000) at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffbd7b0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800020aabeb0 rbx 0 rdx 0xffff800020ac0288 rcx 0 rax 0x31 r8 0xffffffff819ab01f kprintf+0x16f r9 0x1 r10 0x25 r11 0xd94bcf4eade61e0d r12 0 r13 0 r14 0xffff800020ac0288 r15 0 rip 0xffffffff819953f1 savectx+0xb1 cs 0x8 rflags 0x46 rsp 0xffff800020aabe30 ss 0x10 savectx+0xb1: movl $0,%gs:0x530 ddb{1}> show proc PROC (pflogd) pid=165271 stat=onproc flags process=100012 proc=0 pri=51, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac13d0,0xffff800020ac1658 process=0xffff800020adce00 user=0xffff800020aa6000, vmspace=0xfffffd806e7d1008 estcpu=1, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 98819 80499 89786 0 2 0 syz-executor.1 98819 315208 89786 0 7 0x4000000 syz-executor.1 61379 180602 78133 0 3 0x80 nanosleep syz-executor.0 61379 261700 78133 0 3 0x4000080 nanosleep syz-executor.0 61379 50474 78133 0 3 0x4000080 fsleep syz-executor.0 89786 135556 36221 0 2 0x482 syz-executor.1 78133 413340 36221 0 2 0x482 syz-executor.0 20350 361706 1 0 3 0x100083 ttyin getty 40276 355317 0 0 3 0x14200 acct acct 40621 482199 0 0 3 0x14200 bored sosplice 36221 78459 81260 0 3 0x82 thrsleep syz-fuzzer 36221 418797 81260 0 2 0x4000482 syz-fuzzer 36221 374365 81260 0 3 0x4000082 thrsleep syz-fuzzer 36221 27726 81260 0 3 0x4000082 thrsleep syz-fuzzer 36221 437807 81260 0 2 0x4000482 syz-fuzzer 36221 166675 81260 0 3 0x4000082 kqread syz-fuzzer 36221 431601 81260 0 3 0x4000082 thrsleep syz-fuzzer 36221 229323 81260 0 3 0x4000082 thrsleep syz-fuzzer 36221 24511 81260 0 3 0x4000082 thrsleep syz-fuzzer 36221 464821 81260 0 3 0x4000082 thrsleep syz-fuzzer 81260 248526 5741 0 3 0x10008a pause ksh 5741 351373 76384 0 3 0x92 select sshd 76384 223300 1 0 3 0x80 select sshd *58557 165271 98176 74 7 0x100012 pflogd 98176 201661 1 0 3 0x80 netio pflogd 87554 220175 52574 73 3 0x100090 kqread syslogd 52574 452562 1 0 3 0x100082 netio syslogd 62235 231360 1 77 3 0x100090 poll dhclient 5464 270435 1 0 3 0x80 poll dhclient 33881 496028 0 0 3 0x14200 pgzero zerothread 71021 524094 0 0 3 0x14200 aiodoned aiodoned 85763 216030 0 0 3 0x14200 syncer update 62455 322392 0 0 3 0x14200 cleaner cleaner 84937 17255 0 0 3 0x14200 reaper reaper 89631 369373 0 0 3 0x14200 pgdaemon pagedaemon 18334 481842 0 0 3 0x14200 bored crynlk 43871 312508 0 0 3 0x14200 bored crypto 41802 375064 0 0 3 0x40014200 acpi0 acpi0 17923 72280 0 0 3 0x40014200 idle1 61657 280140 0 0 3 0x14200 bored softnet 3615 22757 0 0 3 0x14200 bored systqmp 30581 70209 0 0 3 0x14200 bored systq 88270 167370 0 0 2 0x40014200 softclock 81618 349113 0 0 3 0x40014200 idle0 65981 110691 0 0 3 0x14200 bored smr 1 356103 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 98819 (syz-executor.1) thread 0xffff800020ace020 (315208) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff826382b0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rt_clone+0x5c sys/net/route.c:266 #2 rtalloc_mpath+0xba rt_match sys/net/route.c:244 [inline] #2 rtalloc_mpath+0xba sys/net/route.c:359 #3 ip_output+0x4f2 sys/netinet/ip_output.c:204 #4 rip_output+0x252 sys/netinet/raw_ip.c:289 #5 rip_usrreq+0x46a sys/netinet/raw_ip.c:538 #6 sosend+0x645 sys/kern/uipc_socket.c:524 #7 sendit+0x52b sys/kern/uipc_syscalls.c:662 #8 sys_sendmsg+0x1a4 sys/kern/uipc_syscalls.c:567 #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 rwlock netlock r = 0 (0xffffffff8247e1a8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sosend+0x51b sys/kern/uipc_socket.c:512 #3 sendit+0x52b sys/kern/uipc_syscalls.c:662 #4 sys_sendmsg+0x1a4 sys/kern/uipc_syscalls.c:567 #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9587 6441K 8540K 78643K 22953 0 0 pcb 13 8K 9K 78643K 515 0 0 rtable 134 5K 6K 78643K 1789 0 0 ifaddr 89 18K 19K 78643K 505 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1575 0 0 iov 0 0K 32K 78643K 477 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1237 78K 78K 78643K 4929 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 73 0 0 VM map 23 11K 11K 78643K 30 0 0 sem 12 0K 0K 78643K 769 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 25K 78643K 2379 0 0 sigio 0 0K 0K 78643K 25 0 0 proc 62 63K 83K 78643K 1301 0 0 subproc 32 2K 2K 78643K 310 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 1009 0 0 in_multi 38 2K 2K 78643K 322 0 0 ether_multi 1 0K 0K 78643K 26 0 0 mrt 0 0K 0K 78643K 14 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 72 318K 318K 78643K 72 0 0 exec 0 0K 1K 78643K 673 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 149 201K 202K 78643K 9304 0 0 UVM aobj 130 4K 4K 78643K 134 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 528 0 0 NDP 20 0K 0K 78643K 159 0 0 temp 228 3565K 3641K 78643K 47728 0 0 kqueue 0 0K 0K 78643K 12 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 64 0 57 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 192 0 190 1 0 1 1 0 8 0 rtentry 112 335 0 281 2 0 2 2 0 8 0 unpcb 120 1957 0 1942 4 3 1 2 0 8 0 syncache 264 14 0 14 6 6 0 1 0 8 0 tcpqe 32 2 0 2 2 2 0 1 0 8 0 tcpcb 544 1785 0 1781 4 3 1 2 0 8 0 inpcb 280 4257 0 4247 5 3 2 3 0 8 1 rttmr 72 3 0 3 3 3 0 1 0 8 0 nd6 48 55 0 46 1 0 1 1 0 8 0 pkpcb 40 24 0 24 8 8 0 1 0 8 0 ppxss 1128 65 0 65 8 7 1 1 0 8 1 pffrag 232 55 0 51 7 6 1 1 0 482 0 pffrnode 88 54 0 51 7 6 1 1 0 8 0 pffrent 40 1579 0 1539 7 6 1 1 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 24 211 0 148 1 0 1 1 0 8 0 pfstkey 112 211 0 148 2 0 2 2 0 8 0 pfstate 328 211 0 148 7 1 6 6 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1511 0 1155 33 8 25 25 0 8 0 art_table 32 1512 0 1155 5 1 4 4 0 8 0 art_node 16 333 0 283 1 0 1 1 0 8 0 sysvmsgpl 40 40 0 16 1 0 1 1 0 8 0 semupl 112 4 0 4 2 2 0 1 0 8 0 semapl 112 763 0 753 1 0 1 1 0 8 0 shmpl 112 132 0 4 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 5192 0 3782 46 0 46 46 0 8 0 ffsino 272 5192 0 3782 95 0 95 95 0 8 0 nchpl 144 9137 0 8658 61 40 21 61 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 208 5926 0 0 312 0 312 312 0 8 0 namei 1024 32512 0 32512 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 21 0 0 3 0 3 3 0 8 0 vmpool 552 28 0 7 3 1 2 2 0 8 0 scsiplug 64 4 0 4 3 3 0 1 0 8 0 scxspl 192 30367 0 30367 23 22 1 7 0 8 1 plimitpl 152 236 0 228 1 0 1 1 0 8 0 sigapl 432 2532 0 2516 3 1 2 3 0 8 0 futexpl 56 57540 0 57539 1 0 1 1 0 8 0 knotepl 112 703 0 684 2 1 1 2 0 8 0 kqueuepl 104 646 0 644 1 0 1 1 0 8 0 pipepl 112 1894 0 1875 5 4 1 2 0 8 0 fdescpl 488 2533 0 2516 3 0 3 3 0 8 0 filepl 152 23850 0 23747 18 12 6 7 0 8 2 lockfpl 104 797 0 796 1 0 1 1 0 8 0 lockfspl 48 283 0 282 1 0 1 1 0 8 0 sessionpl 112 35 0 24 1 0 1 1 0 8 0 pgrppl 48 53 0 42 1 0 1 1 0 8 0 ucredpl 96 2283 0 2274 1 0 1 1 0 8 0 zombiepl 144 2517 0 2517 1 0 1 1 0 8 1 processpl 896 2551 0 2517 4 0 4 4 0 8 0 procpl 632 7696 0 7650 5 0 5 5 0 8 0 srpgc 64 20 0 20 7 7 0 1 0 8 0 sosppl 128 55 0 55 9 8 1 1 0 8 1 sockpl 384 6473 0 6446 23 19 4 7 0 8 1 mcl64k 65536 269 0 0 34 0 34 34 0 8 0 mcl16k 16384 10 0 0 2 0 2 2 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 15 0 0 2 0 2 2 0 8 0 mcl8k 8192 14 0 0 2 0 2 2 0 8 0 mcl4k 4096 32 0 0 3 1 2 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 165 0 0 19 0 19 19 0 8 0 mtagpl 80 46 0 0 1 0 1 1 0 8 0 mbufpl 256 1090 0 0 59 0 59 59 0 8 0 bufpl 256 15044 0 7996 441 0 441 441 0 8 0 anonpl 16 360547 0 345157 148 59 89 94 0 124 7 amapchunkpl 152 19186 0 19067 49 43 6 19 0 158 0 amappl16 192 15839 0 14729 160 101 59 68 0 8 3 amappl15 184 244 0 244 2 2 0 1 0 8 0 amappl14 176 486 0 483 1 0 1 1 0 8 0 amappl13 168 164 0 164 2 2 0 1 0 8 0 amappl12 160 78 0 76 1 0 1 1 0 8 0 amappl11 152 629 0 614 1 0 1 1 0 8 0 amappl10 144 205 0 201 1 0 1 1 0 8 0 amappl9 136 1207 0 1199 1 0 1 1 0 8 0 amappl8 128 748 0 712 2 0 2 2 0 8 0 amappl7 120 301 0 292 1 0 1 1 0 8 0 amappl6 112 611 0 599 1 0 1 1 0 8 0 amappl5 104 328 0 312 1 0 1 1 0 8 0 amappl4 96 2431 0 2397 2 1 1 2 0 8 0 amappl3 88 977 0 969 1 0 1 1 0 8 0 amappl2 80 18618 0 18537 3 1 2 3 0 8 0 amappl1 72 67154 0 66702 25 15 10 20 0 8 0 amappl 80 8244 0 8189 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 64 133 0 4 3 0 3 3 0 8 0 uaddrrnd 24 2561 0 2516 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2561 0 2516 1 0 1 1 0 8 0 vmmpekpl 168 25022 0 24980 3 0 3 3 0 8 0 vmmpepl 168 335957 0 333567 235 93 142 144 0 357 35 vmsppl 368 2532 0 2516 2 0 2 2 0 8 0 pdppl 4096 5129 0 5067 8 0 8 8 0 8 0 pvpl 32 926663 0 908237 287 80 207 216 0 265 22 pmappl 232 2560 0 2523 4 1 3 3 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 711 0 15 20 0 20 20 0 8 0