N..N..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 *130535 56830 0 0 0x4000000 1K syz-executor.0 304053 78594 0 0x14000 0x200 0 reaper 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(ffffffff822068b1,ffffffff821d431e,350,ffffffff821ac2d6) at __assert+0x2b sys/kern/subr_prf.c:154 rtrequest(b,ffff8000239b70f8,83,ffff8000239b7198,0) at rtrequest+0xbd2 sys/net/route.c:951 rt_clone(ffff8000239b7208,fffffd806f6d2828,0) at rt_clone+0x78 sys/net/route.c:266 rtalloc_mpath(fffffd806f6d2828,0,0) at rtalloc_mpath+0xba rt_match sys/net/route.c:244 [inline] rtalloc_mpath(fffffd806f6d2828,0,0) at rtalloc_mpath+0xba sys/net/route.c:359 in_pcbselsrc(ffff8000239b72e0,fffffd8061f02020,fffffd806f6d27a8) at in_pcbselsrc+0x219 sys/netinet/in_pcb.c:934 in_pcbconnect(fffffd806f6d27a8,fffffd8061f02000) at in_pcbconnect+0x107 sys/netinet/in_pcb.c:492 tcp_usrreq(fffffd80614a5d98,4,0,fffffd8061f02000,0,ffff800020ab0c70) at tcp_usrreq+0xacb sys/netinet/tcp_usrreq.c:228 sys_connect(ffff800020ab0c70,ffff8000239b7488,ffff8000239b74d0) at sys_connect+0x3df sys/kern/uipc_syscalls.c:388 syscall(ffff8000239b7550) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff8000239b7550) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,fffffffffffffed2,0,3,eed63d8f010) at Xsyscall+0x128 end of kernel end trace frame: 0xeefee71aab0, 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(ffffffff822068b1,ffffffff821d431e,350,ffffffff821ac2d6) at __assert+0x2b sys/kern/subr_prf.c:154 rtrequest(b,ffff8000239b70f8,83,ffff8000239b7198,0) at rtrequest+0xbd2 sys/net/route.c:951 rt_clone(ffff8000239b7208,fffffd806f6d2828,0) at rt_clone+0x78 sys/net/route.c:266 rtalloc_mpath(fffffd806f6d2828,0,0) at rtalloc_mpath+0xba rt_match sys/net/route.c:244 [inline] rtalloc_mpath(fffffd806f6d2828,0,0) at rtalloc_mpath+0xba sys/net/route.c:359 in_pcbselsrc(ffff8000239b72e0,fffffd8061f02020,fffffd806f6d27a8) at in_pcbselsrc+0x219 sys/netinet/in_pcb.c:934 in_pcbconnect(fffffd806f6d27a8,fffffd8061f02000) at in_pcbconnect+0x107 sys/netinet/in_pcb.c:492 tcp_usrreq(fffffd80614a5d98,4,0,fffffd8061f02000,0,ffff800020ab0c70) at tcp_usrreq+0xacb sys/netinet/tcp_usrreq.c:228 sys_connect(ffff800020ab0c70,ffff8000239b7488,ffff8000239b74d0) at sys_connect+0x3df sys/kern/uipc_syscalls.c:388 syscall(ffff8000239b7550) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff8000239b7550) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,fffffffffffffed2,0,3,eed63d8f010) at Xsyscall+0x128 end of kernel end trace frame: 0xeefee71aab0, count: -12 ddb{1}> show registers rdi 0xffffffff818c8e87 db_enter+0x17 rsi 0x4616 __ALIGN_SIZE+0x3616 rbp 0xffff8000239b6f10 rbx 0xffff8000239b6fc0 rdx 0x4617 __ALIGN_SIZE+0x3617 rcx 0xffff800023db0000 rax 0xffff800023db0000 r8 0xffffffff81ad2b6f kprintf+0x16f r9 0x1 r10 0x25 r11 0xcd061d63692e3862 r12 0x3000000008 r13 0xffff8000239b6f20 r14 0x100 r15 0x1 rip 0xffffffff818c8e88 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000239b6f00 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=130535 stat=onproc flags process=0 proc=4000000 pri=73, usrpri=73, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab0780,0xffffffff8265a258 process=0xffff800020add500 user=0xffff8000239b2000, vmspace=0xfffffd807f00ba10 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 56830 123754 32078 0 2 0 syz-executor.0 *56830 130535 32078 0 7 0x4000000 syz-executor.0 32078 465083 88423 0 3 0x82 nanosleep syz-executor.0 4282 54835 88423 0 3 0x82 nanosleep syz-executor.1 49455 175134 1 0 3 0x100083 ttyin getty 5612 43009 0 0 3 0x14200 acct acct 49823 267180 0 0 3 0x14200 bored sosplice 88423 506297 67127 0 3 0x82 thrsleep syz-fuzzer 88423 14266 67127 0 3 0x4000082 nanosleep syz-fuzzer 88423 427012 67127 0 3 0x4000082 thrsleep syz-fuzzer 88423 438850 67127 0 3 0x4000082 thrsleep syz-fuzzer 88423 382390 67127 0 3 0x4000082 thrsleep syz-fuzzer 88423 170573 67127 0 3 0x4000082 kqread syz-fuzzer 88423 82156 67127 0 3 0x4000082 thrsleep syz-fuzzer 88423 356947 67127 0 3 0x4000082 thrsleep syz-fuzzer 88423 198494 67127 0 3 0x4000082 thrsleep syz-fuzzer 88423 75271 67127 0 3 0x4000082 thrsleep syz-fuzzer 67127 435458 4868 0 3 0x10008a pause ksh 4868 271507 3099 0 3 0x92 select sshd 3099 7412 1 0 3 0x80 select sshd 3316 439867 90870 74 3 0x100092 bpf pflogd 90870 434969 1 0 3 0x80 netio pflogd 9203 504379 450 73 3 0x100090 kqread syslogd 450 495684 1 0 3 0x100082 netio syslogd 78967 430491 1 77 3 0x100090 poll dhclient 86295 154577 1 0 3 0x80 poll dhclient 85895 492145 0 0 2 0x14200 zerothread 53859 509983 0 0 3 0x14200 aiodoned aiodoned 28273 130832 0 0 3 0x14200 syncer update 90680 209018 0 0 3 0x14200 cleaner cleaner 78594 304053 0 0 7 0x14200 reaper 16558 275626 0 0 3 0x14200 pgdaemon pagedaemon 49426 283532 0 0 3 0x14200 bored crynlk 15413 110784 0 0 3 0x14200 bored crypto 58227 346296 0 0 3 0x40014200 acpi0 acpi0 98586 491479 0 0 3 0x40014200 idle1 49559 466524 0 0 3 0x14200 bored softnet 65759 521024 0 0 3 0x14200 bored systqmp 45661 484549 0 0 3 0x14200 bored systq 40902 458106 0 0 3 0x40014200 bored softclock 15576 141279 0 0 3 0x40014200 idle0 80237 253058 0 0 3 0x14200 bored smr 1 93159 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806073d4b0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pmap_do_remove+0x88 rcr3 machine/cpufunc.h:141 [inline] #3 pmap_do_remove+0x88 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:418 [inline] #3 pmap_do_remove+0x88 sys/arch/amd64/amd64/pmap.c:1688 #4 uvm_map_teardown+0x195 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:206 [inline] #4 uvm_map_teardown+0x195 sys/uvm/uvm_map.c:2715 #5 uvmspace_free+0x86 sys/uvm/uvm_map.c:3588 #6 uvm_exit+0x29 sys/uvm/uvm_glue.c:297 #7 reaper+0x189 sys/kern/kern_exit.c:442 #8 proc_trampoline+0x1c Process 56830 (syz-executor.0) thread 0xffff800020ab0c70 (130535) exclusive rwlock netlock r = 0 (0xffffffff824d1b18) #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 (0xffffffff8265b1d8) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9600 6458K 8234K 78643K 16911 0 0 pcb 13 12K 14K 78643K 639 0 0 rtable 134 7K 8K 78643K 2032 0 0 ifaddr 99 22K 24K 78643K 605 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1632 0 0 iov 0 0K 32K 78643K 608 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1238 78K 78K 78643K 3608 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 50 0 0 VM map 22 11K 11K 78643K 35 0 0 sem 12 0K 0K 78643K 1397 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 2658 0 0 sigio 0 0K 0K 78643K 41 0 0 proc 62 63K 95K 78643K 1394 0 0 subproc 32 2K 2K 78643K 329 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 275 0 0 in_multi 30 1K 2K 78643K 352 0 0 ether_multi 1 0K 0K 78643K 29 0 0 mrt 2 0K 0K 78643K 10 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 78 344K 344K 78643K 78 0 0 exec 0 0K 1K 78643K 668 0 0 pfkey data 0 0K 4K 78643K 6 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 176 179K 183K 78643K 10572 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 2K 78643K 736 0 0 NDP 22 0K 0K 78643K 187 0 0 temp 242 3561K 4196K 78643K 97720 0 0 kqueue 0 0K 0K 78643K 26 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 67 0 60 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 251 0 249 1 0 1 1 0 8 0 rtentry 112 374 0 320 2 0 2 2 0 8 0 unpcb 120 1551 0 1539 4 2 2 2 0 8 1 syncache 264 14 0 14 8 7 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 149 0 149 3 3 0 1 0 8 0 tcpcb 544 5529 0 5524 37 28 9 12 0 8 8 inpcb 280 8621 0 8613 41 32 9 13 0 8 8 rttmr 72 2 0 2 2 2 0 1 0 8 0 ip6q 72 4 0 4 3 3 0 1 0 8 0 ip6af 40 8 0 8 3 3 0 1 0 8 0 nd6 48 46 0 44 2 1 1 1 0 8 0 pkpcb 40 27 0 27 6 6 0 1 0 8 0 swfcl 56 6 0 0 1 0 1 1 0 8 0 ppxss 1128 76 0 76 8 7 1 1 0 8 1 pffrag 232 70 0 70 5 4 1 1 0 482 1 pffrnode 88 63 0 63 5 4 1 1 0 8 1 pffrent 40 2082 0 2082 5 4 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 24 256 0 167 1 0 1 1 0 8 0 pfstkey 112 256 0 167 3 0 3 3 0 8 0 pfstate 328 256 0 166 9 0 9 9 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 6 0 4 5 3 2 4 0 8 0 art_heap4 256 1405 0 1203 26 9 17 17 0 8 1 art_table 32 1411 0 1207 3 0 3 3 0 8 0 art_node 16 370 0 327 1 0 1 1 0 8 0 sysvmsgpl 40 29 0 13 1 0 1 1 0 8 0 semapl 112 1395 0 1385 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 5428 0 4013 46 0 46 46 0 8 0 ffsino 272 5428 0 4013 95 0 95 95 0 8 0 nchpl 144 9600 0 9148 61 36 25 61 0 8 5 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 33536 0 33536 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 20 0 0 3 0 3 3 0 8 0 vmpool 552 33 0 13 2 0 2 2 0 8 0 scsiplug 64 2 0 2 1 1 0 1 0 8 0 scxspl 192 32654 0 32654 21 20 1 5 0 8 1 plimitpl 152 209 0 200 1 0 1 1 0 8 0 sigapl 432 2806 0 2791 3 1 2 3 0 8 0 futexpl 56 74755 0 74755 1 0 1 1 0 8 1 knotepl 112 760 0 741 6 5 1 3 0 8 0 kqueuepl 104 1004 0 1002 7 3 4 4 0 8 3 pipepl 112 1630 0 1611 3 2 1 2 0 8 0 fdescpl 488 2807 0 2791 3 0 3 3 0 8 0 filepl 152 26496 0 26395 37 25 12 14 0 8 7 lockfpl 104 941 0 940 1 0 1 1 0 8 0 lockfspl 48 329 0 328 1 0 1 1 0 8 0 sessionpl 112 36 0 25 1 0 1 1 0 8 0 pgrppl 48 58 0 47 1 0 1 1 0 8 0 ucredpl 96 3421 0 3412 1 0 1 1 0 8 0 zombiepl 144 2791 0 2790 1 0 1 1 0 8 0 processpl 896 2824 0 2790 4 0 4 4 0 8 0 procpl 632 8849 0 8805 8 3 5 5 0 8 1 srpgc 64 37 0 37 10 9 1 1 0 8 1 sosppl 128 78 0 78 10 9 1 1 0 8 1 sockpl 384 10493 0 10471 63 52 11 22 0 8 8 mcl64k 65536 25 0 0 4 0 4 4 0 8 0 mcl16k 16384 12 0 0 2 0 2 2 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 12 0 0 1 0 1 1 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 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 254 0 0 30 2 28 30 0 8 0 mtagpl 80 70 0 0 1 0 1 1 0 8 0 mbufpl 256 908 0 0 49 0 49 49 0 8 0 bufpl 256 14842 0 7784 442 0 442 442 0 8 0 anonpl 16 364821 0 347097 147 60 87 100 0 124 2 amapchunkpl 152 21115 0 20960 44 36 8 14 0 158 1 amappl16 192 15588 0 14437 142 83 59 71 0 8 0 amappl15 184 392 0 387 1 0 1 1 0 8 0 amappl14 176 920 0 911 1 0 1 1 0 8 0 amappl13 168 19 0 18 1 0 1 1 0 8 0 amappl12 160 575 0 574 2 1 1 1 0 8 0 amappl11 152 322 0 307 1 0 1 1 0 8 0 amappl10 144 89 0 83 1 0 1 1 0 8 0 amappl9 136 1288 0 1285 1 0 1 1 0 8 0 amappl8 128 893 0 840 2 0 2 2 0 8 0 amappl7 120 179 0 171 1 0 1 1 0 8 0 amappl6 112 276 0 263 1 0 1 1 0 8 0 amappl5 104 855 0 841 1 0 1 1 0 8 0 amappl4 96 2914 0 2874 2 1 1 2 0 8 0 amappl3 88 1191 0 1185 1 0 1 1 0 8 0 amappl2 80 20794 0 20708 3 1 2 3 0 8 0 amappl1 72 73765 0 73302 25 15 10 20 0 8 0 amappl 80 9454 0 9390 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 2840 0 2791 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2840 0 2791 1 0 1 1 0 8 0 vmmpekpl 168 26788 0 26747 3 0 3 3 0 8 0 vmmpepl 168 375458 0 373000 249 100 149 149 0 357 34 vmsppl 368 2806 0 2790 2 0 2 2 0 8 0 pdppl 4096 5687 0 5626 9 1 8 8 0 8 0 pvpl 32 1001572 0 981180 310 95 215 232 0 265 24 pmappl 232 2839 0 2803 4 1 3 3 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 715 0 46 20 0 20 20 0 8 0