login: panic: kernel diagnostic assertion "rt->rt_ifa->ifa_ifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/route.c", line 848 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 470892 98749 0 0 0 0 syz-executor.0 *231673 98749 0 0 0x4000000 1K syz-executor.0 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(ffffffff82208f7b,ffffffff821d48a2,350,ffffffff821acbc4) at __assert+0x2b sys/kern/subr_prf.c:154 rtrequest(b,ffff800023991338,83,ffff8000239913d8,0) at rtrequest+0xbd2 sys/net/route.c:951 rt_clone(ffff800023991448,fffffd806f6cc5f8,0) at rt_clone+0x78 sys/net/route.c:266 rtalloc_mpath(fffffd806f6cc5f8,0,0) at rtalloc_mpath+0xba rt_match sys/net/route.c:244 [inline] rtalloc_mpath(fffffd806f6cc5f8,0,0) at rtalloc_mpath+0xba sys/net/route.c:359 in_pcbselsrc(ffff800023991520,fffffd80717d1720,fffffd806f6cc578) at in_pcbselsrc+0x219 sys/netinet/in_pcb.c:934 in_pcbconnect(fffffd806f6cc578,fffffd80717d1700) at in_pcbconnect+0x107 sys/netinet/in_pcb.c:492 udp_usrreq(fffffd8071d1ede0,4,0,fffffd80717d1700,0,ffff800020b43400) at udp_usrreq+0x560 sys_connect(ffff800020b43400,ffff8000239916a8,ffff8000239916f0) at sys_connect+0x3df sys/kern/uipc_syscalls.c:388 syscall(ffff800023991770) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023991770) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,fffffffffffffed2,0,3,bc5e1a39010) at Xsyscall+0x128 end of kernel end trace frame: 0xbc8b2615a40, count: 3 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 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(ffffffff82208f7b,ffffffff821d48a2,350,ffffffff821acbc4) at __assert+0x2b sys/kern/subr_prf.c:154 rtrequest(b,ffff800023991338,83,ffff8000239913d8,0) at rtrequest+0xbd2 sys/net/route.c:951 rt_clone(ffff800023991448,fffffd806f6cc5f8,0) at rt_clone+0x78 sys/net/route.c:266 rtalloc_mpath(fffffd806f6cc5f8,0,0) at rtalloc_mpath+0xba rt_match sys/net/route.c:244 [inline] rtalloc_mpath(fffffd806f6cc5f8,0,0) at rtalloc_mpath+0xba sys/net/route.c:359 in_pcbselsrc(ffff800023991520,fffffd80717d1720,fffffd806f6cc578) at in_pcbselsrc+0x219 sys/netinet/in_pcb.c:934 in_pcbconnect(fffffd806f6cc578,fffffd80717d1700) at in_pcbconnect+0x107 sys/netinet/in_pcb.c:492 udp_usrreq(fffffd8071d1ede0,4,0,fffffd80717d1700,0,ffff800020b43400) at udp_usrreq+0x560 sys_connect(ffff800020b43400,ffff8000239916a8,ffff8000239916f0) at sys_connect+0x3df sys/kern/uipc_syscalls.c:388 syscall(ffff800023991770) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023991770) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,fffffffffffffed2,0,3,bc5e1a39010) at Xsyscall+0x128 end of kernel end trace frame: 0xbc8b2615a40, count: -12 ddb{1}> show registers rdi 0xffffffff814c4807 db_enter+0x17 rsi 0x416d __ALIGN_SIZE+0x316d rbp 0xffff800023991150 rbx 0xffff800023991200 rdx 0x416e __ALIGN_SIZE+0x316e rcx 0xffff80002338c000 rax 0xffff80002338c000 r8 0xffffffff8141f94f kprintf+0x16f r9 0x1 r10 0x25 r11 0x8b61c33f1ea32698 r12 0x3000000008 r13 0xffff800023991160 r14 0x100 r15 0x1 rip 0xffffffff814c4808 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023991140 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=231673 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020b42a20,0xffffffff8265b7c8 process=0xffff800020add180 user=0xffff80002398c000, vmspace=0xfffffd807f00a5c0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 98749 470892 38749 0 7 0 syz-executor.0 *98749 231673 38749 0 7 0x4000000 syz-executor.0 90069 365923 1 0 3 0x100083 ttyin getty 38749 344567 74320 0 3 0x82 nanosleep syz-executor.0 69308 378080 74320 0 3 0x2 biowait syz-executor.1 77837 508134 0 0 3 0x14200 acct acct 27007 431482 0 0 3 0x14200 bored sosplice 74320 486355 52158 0 3 0x82 thrsleep syz-fuzzer 74320 447720 52158 0 3 0x4000082 nanosleep syz-fuzzer 74320 464354 52158 0 3 0x4000082 nanosleep syz-fuzzer 74320 510218 52158 0 3 0x4000082 thrsleep syz-fuzzer 74320 122270 52158 0 3 0x4000082 thrsleep syz-fuzzer 74320 105480 52158 0 3 0x4000082 thrsleep syz-fuzzer 74320 395250 52158 0 3 0x4000082 thrsleep syz-fuzzer 74320 17232 52158 0 3 0x4000082 thrsleep syz-fuzzer 74320 284450 52158 0 3 0x4000082 thrsleep syz-fuzzer 74320 131037 52158 0 3 0x4000082 kqread syz-fuzzer 52158 102027 85935 0 3 0x10008a pause ksh 85935 92528 94487 0 3 0x92 select sshd 94487 435483 1 0 3 0x80 select sshd 65222 68984 18967 74 3 0x100092 bpf pflogd 18967 378987 1 0 3 0x80 netio pflogd 52160 95564 82016 73 3 0x100090 kqread syslogd 82016 523510 1 0 3 0x100082 netio syslogd 59289 371496 1 77 3 0x100090 poll dhclient 2020 296653 1 0 3 0x80 poll dhclient 5029 251831 0 0 3 0x14200 pgzero zerothread 30318 382302 0 0 3 0x14200 aiodoned aiodoned 193 41600 0 0 3 0x14200 syncer update 33409 516204 0 0 3 0x14200 cleaner cleaner 43962 212170 0 0 3 0x14200 reaper reaper 93628 39324 0 0 3 0x14200 pgdaemon pagedaemon 64691 94148 0 0 3 0x14200 bored crynlk 89280 49051 0 0 3 0x14200 bored crypto 63138 168733 0 0 3 0x40014200 acpi0 acpi0 34594 198060 0 0 3 0x40014200 idle1 24880 463382 0 0 3 0x14200 bored softnet 74141 297285 0 0 3 0x14200 bored systqmp 23155 320931 0 0 3 0x14200 bored systq 32449 404974 0 0 3 0x40014200 bored softclock 76683 76941 0 0 3 0x40014200 idle0 30441 226473 0 0 3 0x14200 bored smr 1 445487 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 98749 (syz-executor.0) thread 0xffff800020b43400 (231673) exclusive rwlock netlock r = 0 (0xffffffff824dc718) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sys_connect+0x6b sys/kern/uipc_syscalls.c:362 #3 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #3 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #4 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff82648ec0) #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 69308 (syz-executor.1) thread 0xffff800020ab0508 (378080) exclusive rrwlock inode r = 0 (0xfffffd806f7452b8) #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 (0xfffffd806e57a1b0) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9608 6450K 7803K 78643K 17666 0 0 pcb 13 12K 14K 78643K 695 0 0 rtable 107 13K 15K 78643K 2410 0 0 ifaddr 86 20K 22K 78643K 666 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1664 0 0 iov 0 0K 24K 78643K 694 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1222 77K 77K 78643K 4445 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 56 0 0 VM map 24 12K 12K 78643K 41 0 0 sem 12 0K 1K 78643K 785 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 3342 0 0 sigio 0 0K 0K 78643K 40 0 0 proc 62 63K 95K 78643K 1690 0 0 subproc 32 2K 2K 78643K 408 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 280 0 0 in_multi 18 1K 2K 78643K 481 0 0 ether_multi 1 0K 0K 78643K 30 0 0 mrt 2 0K 0K 78643K 33 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 204 901K 901K 78643K 204 0 0 exec 0 0K 1K 78643K 887 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 171 155K 164K 78643K 12756 0 0 UVM aobj 130 5K 5K 78643K 139 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 590 0 0 NDP 20 0K 1K 78643K 216 0 0 temp 229 3561K 4200K 78643K 102570 0 0 kqueue 0 0K 0K 78643K 41 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 76 0 71 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 285 0 283 1 0 1 1 0 8 0 rtentry 112 469 0 433 2 0 2 2 0 8 0 unpcb 120 8716 0 8702 14 13 1 3 0 8 0 syncache 264 17 0 17 8 8 0 1 0 8 0 tcpqe 32 64 0 64 5 5 0 1 0 8 0 tcpcb 544 2619 0 2615 49 48 1 13 0 8 0 inpcb 280 5917 0 5909 51 49 2 13 0 8 1 rttmr 72 10 0 10 7 7 0 1 0 8 0 ip6q 72 2 0 2 1 0 1 1 0 8 1 ip6af 40 4 0 4 1 0 1 1 0 8 1 nd6 48 65 0 65 2 2 0 1 0 8 0 pkpcb 40 10 0 10 4 3 1 1 0 8 1 ppxss 1128 82 0 82 10 10 0 1 0 8 0 pffrag 232 70 0 70 12 11 1 1 0 482 1 pffrnode 88 70 0 70 12 11 1 1 0 8 1 pffrent 40 1933 0 1933 12 11 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 24 392 0 195 2 0 2 2 0 8 0 pfstkey 112 392 0 195 6 0 6 6 0 8 0 pfstate 328 392 0 195 18 1 17 17 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 13 0 10 8 4 4 4 0 8 1 art_heap4 256 1890 0 1731 23 8 15 16 0 8 1 art_table 32 1903 0 1741 5 3 2 3 0 8 0 art_node 16 464 0 431 1 0 1 1 0 8 0 sysvmsgpl 40 35 0 18 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 783 0 773 1 0 1 1 0 8 0 shmpl 112 137 0 9 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 7381 0 5966 46 0 46 46 0 8 0 ffsino 272 7381 0 5966 95 0 95 95 0 8 0 nchpl 144 12957 0 12445 60 38 22 60 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 59565 0 59564 5 4 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 22 0 0 3 0 3 3 0 8 0 vmpool 552 39 0 17 6 4 2 2 0 8 0 scsiplug 64 4 0 4 3 3 0 1 0 8 0 scxspl 192 37322 0 37321 26 25 1 7 0 8 0 plimitpl 152 289 0 281 1 0 1 1 0 8 0 sigapl 432 3476 0 3461 5 3 2 3 0 8 0 futexpl 56 84667 0 84667 2 1 1 1 0 8 1 knotepl 112 853 0 834 7 6 1 3 0 8 0 kqueuepl 104 1417 0 1409 13 12 1 4 0 8 0 pipepl 112 2136 0 2117 6 5 1 2 0 8 0 fdescpl 488 3477 0 3461 3 0 3 3 0 8 0 filepl 152 47107 0 46993 56 50 6 15 0 8 1 lockfpl 104 1387 0 1386 1 0 1 1 0 8 0 lockfspl 48 425 0 424 1 0 1 1 0 8 0 sessionpl 112 42 0 31 1 0 1 1 0 8 0 pgrppl 48 333 0 322 1 0 1 1 0 8 0 ucredpl 96 14481 0 14471 1 0 1 1 0 8 0 zombiepl 144 3461 0 3461 3 2 1 1 0 8 1 processpl 896 3494 0 3461 6 2 4 5 0 8 0 procpl 632 10784 0 10741 9 4 5 5 0 8 0 srpgc 64 35 0 35 13 13 0 1 0 8 0 sosppl 128 75 0 75 14 13 1 1 0 8 1 sockpl 384 14983 0 14959 75 71 4 22 0 8 1 mcl64k 65536 720 0 0 72 7 65 65 0 8 0 mcl16k 16384 16 0 0 2 0 2 2 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 21 0 0 3 1 2 3 0 8 0 mcl4k 4096 25 0 0 4 2 2 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 179 0 0 21 3 18 21 0 8 0 mtagpl 80 31 0 0 1 0 1 1 0 8 0 mbufpl 256 800 0 0 38 0 38 38 0 8 0 bufpl 256 17585 0 10527 442 0 442 442 0 8 0 anonpl 16 447774 0 427170 179 79 100 100 0 124 14 amapchunkpl 152 25782 0 25612 58 46 12 14 0 158 3 amappl16 192 18807 0 17662 173 107 66 70 0 8 8 amappl15 184 1027 0 1023 1 0 1 1 0 8 0 amappl14 176 585 0 576 1 0 1 1 0 8 0 amappl12 160 405 0 403 2 1 1 1 0 8 0 amappl11 152 185 0 170 1 0 1 1 0 8 0 amappl10 144 830 0 821 1 0 1 1 0 8 0 amappl9 136 1100 0 1097 1 0 1 1 0 8 0 amappl8 128 699 0 643 2 0 2 2 0 8 0 amappl7 120 932 0 920 1 0 1 1 0 8 0 amappl6 112 168 0 159 1 0 1 1 0 8 0 amappl5 104 711 0 696 1 0 1 1 0 8 0 amappl4 96 3554 0 3523 1 0 1 1 0 8 0 amappl3 88 514 0 508 1 0 1 1 0 8 0 amappl2 80 25940 0 25867 3 1 2 3 0 8 0 amappl1 72 88417 0 87984 25 15 10 20 0 8 0 amappl 80 11458 0 11404 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 64 138 0 9 3 0 3 3 0 8 0 uaddrrnd 24 3516 0 3461 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3516 0 3461 1 0 1 1 0 8 0 vmmpekpl 168 31392 0 31354 3 1 2 3 0 8 0 vmmpepl 168 449023 0 446671 255 110 145 161 0 357 34 vmsppl 368 3476 0 3461 2 0 2 2 0 8 0 pdppl 4096 7039 0 6978 14 5 9 9 0 8 1 pvpl 32 1126373 0 1102803 367 138 229 230 0 265 35 pmappl 232 3515 0 3478 4 1 3 3 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 785 0 85 21 0 21 21 0 8 0