panic: kernel diagnostic assertion "cifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/route.c", line 1046 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *301336 20701 60928 0x10 0x4000000 0K syz-executor.7 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff828a55db) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8292df00,ffffffff828d93d6,416,ffffffff828fb80b) at __assert+0x29 sys/kern/subr_prf.c:157 rtrequest(1,ffff800037398e58,4,ffff800037398f00,0) at rtrequest+0xb6f sys/net/route.c:1046 rt_ifa_add(ffff800000e98100,840100,ffff800000e98158,0) at rt_ifa_add+0x1ac sys/net/route.c:1241 in_ifinit(ffff800000e2a000,ffff800000e98100,ffff800000e98158,1) at in_ifinit+0x36d in_insert_prefix sys/netinet/in.c:770 [inline] in_ifinit(ffff800000e2a000,ffff800000e98100,ffff800000e98158,1) at in_ifinit+0x36d sys/netinet/in.c:703 in_ioctl_change_ifaddr(8040691a,ffff800037399160,ffff800000e2a000) at in_ioctl_change_ifaddr+0x63d sys/netinet/in.c:504 ifioctl(ffff800000e36488,8040691a,ffff800037399160,ffff80002bc97568) at ifioctl+0xe45 pru_control sys/sys/protosw.h:377 [inline] ifioctl(ffff800000e36488,8040691a,ffff800037399160,ffff80002bc97568) at ifioctl+0xe45 sys/net/if.c:2449 sys_ioctl(ffff80002bc97568,ffff800037399340,ffff800037399290) at sys_ioctl+0x4a2 syscall(ffff800037399340) at syscall+0x5ae mi_syscall sys/sys/syscall_mi.h:183 [inline] syscall(ffff800037399340) at syscall+0x5ae sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbb65dcaab80, count: 4 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 *cpu0: kernel diagnostic assertion "cifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/route.c", line 1046 ddb{0}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff828a55db) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8292df00,ffffffff828d93d6,416,ffffffff828fb80b) at __assert+0x29 sys/kern/subr_prf.c:157 rtrequest(1,ffff800037398e58,4,ffff800037398f00,0) at rtrequest+0xb6f sys/net/route.c:1046 rt_ifa_add(ffff800000e98100,840100,ffff800000e98158,0) at rt_ifa_add+0x1ac sys/net/route.c:1241 in_ifinit(ffff800000e2a000,ffff800000e98100,ffff800000e98158,1) at in_ifinit+0x36d in_insert_prefix sys/netinet/in.c:770 [inline] in_ifinit(ffff800000e2a000,ffff800000e98100,ffff800000e98158,1) at in_ifinit+0x36d sys/netinet/in.c:703 in_ioctl_change_ifaddr(8040691a,ffff800037399160,ffff800000e2a000) at in_ioctl_change_ifaddr+0x63d sys/netinet/in.c:504 ifioctl(ffff800000e36488,8040691a,ffff800037399160,ffff80002bc97568) at ifioctl+0xe45 pru_control sys/sys/protosw.h:377 [inline] ifioctl(ffff800000e36488,8040691a,ffff800037399160,ffff80002bc97568) at ifioctl+0xe45 sys/net/if.c:2449 sys_ioctl(ffff80002bc97568,ffff800037399340,ffff800037399290) at sys_ioctl+0x4a2 syscall(ffff800037399340) at syscall+0x5ae mi_syscall sys/sys/syscall_mi.h:183 [inline] syscall(ffff800037399340) at syscall+0x5ae sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbb65dcaab80, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800037398c50 rbx 0xffffffff82cb7cb7 cpu_info_full_primary+0x2cb7 rdx 0 rcx 0xffff80002bc97568 rax 0xffffffff82cb6ff0 cpu_info_full_primary+0x1ff0 r8 0 r9 0x8080808080808080 r10 0x7dfc797625744f78 r11 0x28463d5cedbe8ff9 r12 0xffffffff82cb7ab8 cpu_info_full_primary+0x2ab8 r13 0 r14 0 r15 0x1 rip 0xffffffff82194ccc db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800037398c40 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.7) tid=301336 pid=20701 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002bc97ab8,0xffff80002bc98568 process=0xffff800030558028 user=0xffff800037394000, vmspace=0xfffffd8076ebb738 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 61899 264047 4550 0 2 0x40 syz-executor.2 20701 47622 18782 60928 2 0x10 syz-executor.7 *20701 301336 18782 60928 7 0x4000010 syz-executor.7 45661 131985 94786 0 3 0x2 clonelk ifconfig 4550 124362 49534 0 3 0x82 ppwait syz-executor.2 94786 214530 25694 0 3 0x10008a sigsusp sh 93292 80021 49534 0 2 0x2 syz-executor.4 25694 486088 49534 0 3 0x82 wait syz-executor.5 46185 245599 7018 0 3 0x2 clonelk ifconfig 7018 385365 72693 0 3 0x10008a sigsusp sh 72693 376443 49534 0 3 0x82 wait syz-executor.1 18782 104938 49534 0 2 0x482 syz-executor.7 52589 177 1 0 3 0x100083 ttyin getty 55817 400036 0 0 3 0x14200 acct acct 35246 12164 1 0 3 0x80 fsleep syz-executor.3 35246 62449 1 0 3 0x4000080 netio syz-executor.3 35246 13718 1 0 3 0x4000080 fsleep syz-executor.3 89884 121194 0 0 3 0x14280 nfsidl nfsio 68636 523895 0 0 3 0x14280 nfsidl nfsio 52938 126232 0 0 3 0x14280 nfsidl nfsio 8401 154473 0 0 3 0x14280 nfsidl nfsio 32813 36231 0 0 3 0x14280 nfsidl nfsio 39680 265390 0 0 3 0x14200 bored sosplice 49534 269390 32136 0 3 0x2000082 wait syz-fuzzer 49534 108401 32136 0 2 0x6000482 syz-fuzzer 49534 261657 32136 0 3 0x6000082 wait syz-fuzzer 49534 97252 32136 0 3 0x6000082 wait syz-fuzzer 49534 101767 32136 0 3 0x6000082 thrsleep syz-fuzzer 49534 42643 32136 0 3 0x6000082 wait syz-fuzzer 49534 214787 32136 0 3 0x6000082 thrsleep syz-fuzzer 49534 174983 32136 0 3 0x6000082 thrsleep syz-fuzzer 49534 288154 32136 0 2 0x6000002 syz-fuzzer 49534 128116 32136 0 3 0x6000082 thrsleep syz-fuzzer 49534 141529 32136 0 3 0x6000082 thrsleep syz-fuzzer 49534 63047 32136 0 3 0x6000082 thrsleep syz-fuzzer 49534 115128 32136 0 3 0x6000082 thrsleep syz-fuzzer 49534 414592 32136 0 3 0x6000082 wait syz-fuzzer 49534 165678 32136 0 3 0x6000082 thrsleep syz-fuzzer 49534 415709 32136 0 3 0x6000082 thrsleep syz-fuzzer 32136 407864 93250 0 3 0x10008a sigsusp ksh 93250 194084 30994 0 3 0x9a kqread sshd 30994 491268 1 0 3 0x88 kqread sshd 48269 24994 53587 74 3 0x1100092 bpf pflogd 53587 22157 1 0 3 0x80 netio pflogd 299 105463 90004 73 3 0x1100090 kqread syslogd 90004 467059 1 0 3 0x100082 netio syslogd 52670 80420 1 0 3 0x100080 kqread resolvd 25478 414769 46774 77 3 0x100092 kqread dhcpleased 61283 493266 46774 77 3 0x100092 kqread dhcpleased 46774 257425 1 0 3 0x80 kqread dhcpleased 58338 360861 0 0 3 0x14200 bored smr 59760 109194 0 0 2 0x14200 zerothread 96053 49906 0 0 3 0x14200 aiodoned aiodoned 58760 80092 0 0 3 0x14200 syncer update 39121 256093 0 0 3 0x14200 cleaner cleaner 39889 47699 0 0 3 0x14200 reaper reaper 31469 162382 0 0 3 0x14200 pgdaemon pagedaemon 81534 370005 0 0 3 0x14200 bored viomb 64647 179598 0 0 3 0x40014200 acpi0 acpi0 18134 497567 0 0 7 0x40014200 idle1 50807 157682 0 0 3 0x14200 bored softnet3 98347 424022 0 0 3 0x14200 bored softnet2 61885 271939 0 0 3 0x14200 bored softnet1 31814 352962 0 0 3 0x14200 bored softnet0 78798 94700 0 0 3 0x14200 bored systqmp 63647 233891 0 0 3 0x14200 bored systq 2399 288317 0 0 3 0x14200 tmoslp softclockmp 80310 43779 0 0 2 0x40014200 softclock 56014 469798 0 0 3 0x40014200 idle0 1 183983 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 20701 (syz-executor.7) thread 0xffff80002bc97568 (301336) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10185 6492K 7153K 166960K 20754 0 pcb 16 16K 19K 166960K 1245 0 rtable 107 12K 16K 166960K 3266 0 pf 27 8K 11K 166960K 331 0 ifaddr 25 13K 17K 166960K 363 0 ifgroup 44 2K 3K 166960K 523 0 sysctl 3 0K 0K 166960K 3 0 counters 58 35K 37K 166960K 342 0 ioctlops 0 0K 4K 166960K 2370 0 iov 1 16K 50K 166960K 1248 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1589 99K 100K 166960K 6430 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 13K 166960K 208 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 798 0 dirhash 12 2K 2K 166960K 102 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 15 50K 93K 166960K 14123 0 sigio 0 0K 0K 166960K 772 0 proc 92 116K 128K 166960K 2509 0 subproc 78 4K 8K 166960K 847 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 953 0 in_multi 33 2K 7K 166960K 822 0 ether_multi 1 0K 0K 166960K 11 0 mrt 3 0K 0K 166960K 14 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 2701 0 pfkey data 0 0K 4K 166960K 10 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 491 659K 686K 166960K 138234 0 UVM aobj 131 4K 4K 166960K 134 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 350 0 NDP 9 0K 1K 166960K 274 0 temp 67 6787K 6916K 166960K 150496 0 kqueue 12 18K 26K 166960K 1051 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 24 0 0 1 0 1 1 0 8 0 rtpcb 120 1244 0 1241 19 18 1 4 0 8 0 rtentry 112 983 0 941 5 1 4 4 0 8 0 unpcb 144 10082 0 10063 107 105 2 8 0 8 1 syncache 336 117 0 117 27 27 0 1 0 8 0 sackhl 24 2 0 2 2 2 0 1 0 8 0 tcpqe 32 216 0 216 20 20 0 1 0 8 0 tcpcb 808 4629 0 4618 146 134 12 12 0 8 10 arp 120 215 0 211 1 0 1 1 0 8 0 inpcb 392 11015 0 10996 191 181 10 15 0 8 8 nd6 136 188 0 181 1 0 1 1 0 8 0 pkpcb 40 34 0 34 8 8 0 1 0 8 0 kcovpl 48 62 0 56 1 0 1 1 0 8 0 ppxss 1168 51 0 51 14 14 0 1 0 8 0 pffrag 232 406 0 404 4 3 1 1 0 482 0 pffrnode 88 404 0 402 4 3 1 1 0 8 0 pffrent 40 1096 0 1094 6 5 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 498 0 480 1 0 1 1 0 8 0 pfstkey 128 532 0 514 4 2 2 2 0 8 0 pfstate 376 532 0 514 17 12 5 6 0 8 0 pfrule 1344 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 3417 0 3217 54 24 30 30 0 8 12 art_table 32 3418 0 3217 4 0 4 4 0 8 0 art_node 16 954 0 917 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 0 1 0 1 1 0 8 0 semapl 112 796 0 786 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 77 0 60 3 0 3 3 0 8 0 dino2pl 256 18752 0 17243 96 0 96 96 0 8 0 ffsino 272 18752 0 17243 102 0 102 102 0 8 0 nchpl 144 37414 0 35774 63 0 63 63 0 8 0 uvmvnodes 80 6840 0 0 140 0 140 140 0 8 0 vnodes 216 6840 0 0 380 0 380 380 0 8 0 namei 1024 126879 0 126879 8 7 1 2 0 8 1 percpumem 16 185 0 142 1 0 1 1 0 8 0 vcpupl 2048 104 0 0 13 0 13 13 0 8 0 vmpool 696 148 0 44 10 0 10 10 0 8 0 kstatmem 264 302 0 284 4 1 3 3 0 8 0 scxspl 216 127786 0 127786 39 38 1 8 1 8 1 plimitpl 152 1745 0 1730 1 0 1 1 0 8 0 sigapl 424 14354 0 14301 12 3 9 9 0 8 0 futexpl 64 113743 0 113741 2 1 1 1 0 8 0 knotepl 120 875 0 0 11 0 11 11 0 8 0 kqueuepl 216 2781 0 2773 53 52 1 5 0 8 0 pipepl 320 2606 0 2586 70 67 3 9 0 8 1 fdescpl 496 14313 0 14285 11 6 5 5 0 8 0 filepl 152 80533 0 80332 157 142 15 22 0 8 4 lockfpl 104 3940 0 3938 10 9 1 3 0 8 0 lockfspl 48 956 0 954 1 0 1 1 0 8 0 sessionpl 144 83 0 68 1 0 1 1 0 8 0 pgrppl 48 164 0 149 1 0 1 1 0 8 0 ucredpl 104 11302 0 11283 1 0 1 1 0 8 0 zombiepl 144 14302 0 14301 1 0 1 1 0 8 0 processpl 1136 14354 0 14301 6 0 6 6 0 8 0 procpl 680 38465 0 38394 15 6 9 10 0 8 0 srpgc 96 63 0 63 24 24 0 1 0 8 0 sosppl 168 132 0 129 13 12 1 1 0 8 0 sockpl 584 22425 0 22384 222 211 11 18 0 8 7 mcl64k 65536 22 0 0 3 1 2 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 25 0 0 2 0 2 2 0 8 0 mcl8k 8192 42 0 0 4 1 3 3 0 8 0 mcl4k 4096 65 0 0 6 0 6 6 0 8 0 mcl2k2 2112 18 0 0 2 0 2 2 0 8 0 mcl2k 2048 472 0 0 39 20 19 39 0 8 0 mtagpl 96 357 0 0 4 0 4 4 0 8 0 mbufpl 256 9257 0 0 550 0 550 550 0 8 0 bufpl 280 27820 0 20976 489 0 489 489 0 8 0 anonpl 24 1563506 0 1551057 300 180 120 155 0 186 0 amapchunkpl 152 441236 0 440444 143 102 41 69 0 158 0 amappl16 200 31346 0 30699 133 96 37 46 0 8 0 amappl15 192 119 0 118 2 1 1 1 0 8 0 amappl14 184 343 0 324 3 1 2 2 0 8 0 amappl13 176 21 0 21 3 3 0 1 0 8 0 amappl12 168 15786 0 15752 3 1 2 2 0 8 0 amappl11 160 121 0 106 1 0 1 1 0 8 0 amappl10 152 90 0 80 2 1 1 1 0 8 0 amappl9 144 267 0 267 20 19 1 1 0 8 1 amappl8 136 899 0 745 6 0 6 6 0 8 0 amappl7 128 360 0 331 2 0 2 2 0 8 0 amappl6 120 1134 0 1111 1 0 1 1 0 8 0 amappl5 112 389 0 378 1 0 1 1 0 8 0 amappl4 104 1061 0 1021 2 0 2 2 0 8 0 amappl3 96 84937 0 84871 5 2 3 4 0 8 0 amappl2 88 15485 0 15404 3 1 2 3 0 8 0 amappl1 80 64630 0 63988 24 10 14 23 0 8 0 amappl 88 136826 0 136567 8 0 8 8 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 133 0 3 3 0 3 3 0 8 0 uaddrrnd 24 14461 0 14329 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 14461 0 14329 1 0 1 1 0 8 0 vmmpekpl 168 109530 0 109448 5 0 5 5 0 8 0 vmmpepl 168 879682 0 876961 518 314 204 204 0 357 63 vmsppl 448 14460 0 14329 19 3 16 16 0 8 0 rwobjpl 56 216817 0 207866 145 17 128 128 0 8 0 pdppl 4096 28929 0 28762 889 722 167 176 0 8 0 pvpl 32 43670 0 0 353 0 353 353 0 265 0 pmappl 248 14460 0 14329 13 4 9 9 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2217 0 1172 31 0 31 31 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff828a55db) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8292df00,ffffffff828d93d6,416,ffffffff828fb80b) at __assert+0x29 sys/kern/subr_prf.c:157 rtrequest(1,ffff800037398e58,4,ffff800037398f00,0) at rtrequest+0xb6f sys/net/route.c:1046 rt_ifa_add(ffff800000e98100,840100,ffff800000e98158,0) at rt_ifa_add+0x1ac sys/net/route.c:1241 in_ifinit(ffff800000e2a000,ffff800000e98100,ffff800000e98158,1) at in_ifinit+0x36d in_insert_prefix sys/netinet/in.c:770 [inline] in_ifinit(ffff800000e2a000,ffff800000e98100,ffff800000e98158,1) at in_ifinit+0x36d sys/netinet/in.c:703 in_ioctl_change_ifaddr(8040691a,ffff800037399160,ffff800000e2a000) at in_ioctl_change_ifaddr+0x63d sys/netinet/in.c:504 ifioctl(ffff800000e36488,8040691a,ffff800037399160,ffff80002bc97568) at ifioctl+0xe45 pru_control sys/sys/protosw.h:377 [inline] ifioctl(ffff800000e36488,8040691a,ffff800037399160,ffff80002bc97568) at ifioctl+0xe45 sys/net/if.c:2449 sys_ioctl(ffff80002bc97568,ffff800037399340,ffff800037399290) at sys_ioctl+0x4a2 syscall(ffff800037399340) at syscall+0x5ae mi_syscall sys/sys/syscall_mi.h:183 [inline] syscall(ffff800037399340) at syscall+0x5ae sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbb65dcaab80, count: -11 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffff800029cebff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800029cebff0) at sched_idle+0x41e sys/kern/kern_sched.c:183 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800029cebff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800029cebff0) at sched_idle+0x41e sys/kern/kern_sched.c:183 end trace frame: 0x0, count: -5