Spanic: kernel diagnostic assertion "cifp != NULL" failed: file "/syzkaller/managers/main/kernel/sys/net/route.c", line 1078 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *230545 79537 0 0x8000000 0x4000000 0 syz-executor.5 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82931932) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828e4822,ffffffff828924fc,436,ffffffff8285638c) at __assert+0x29 sys/kern/subr_prf.c:157 rtrequest(1,ffff800037886fe8,0,ffff800037886f60,0) at rtrequest+0xb49 sys/net/route.c:1078 rtm_output(ffff800000e1d300,ffff800037887090,ffff800037886fe8,0,0) at rtm_output+0x614 sys/net/rtsock.c:959 route_output(fffffd806e1fb100,fffffd806fcc97b8) at route_output+0x6bb sys/net/rtsock.c:864 route_send(fffffd806fcc97b8,fffffd806e1fb100,0,0) at route_send+0x8f sys/net/rtsock.c:340 sosend(fffffd806fcc97b8,0,ffff800037887248,0,0,0) at sosend+0x663 sendit(ffff80002a6df730,3,ffff800037887340,0,ffff8000378873f0) at sendit+0x54c sys/kern/uipc_syscalls.c:786 sys_sendto(ffff80002a6df730,ffff8000378874a0,ffff8000378873f0) at sys_sendto+0x84 sys/kern/uipc_syscalls.c:564 syscall(ffff8000378874a0) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa9bedf09d30, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: kernel diagnostic assertion "cifp != NULL" failed: file "/syzkaller/managers/main/kernel/sys/net/route.c", line 1078 ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82931932) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828e4822,ffffffff828924fc,436,ffffffff8285638c) at __assert+0x29 sys/kern/subr_prf.c:157 rtrequest(1,ffff800037886fe8,0,ffff800037886f60,0) at rtrequest+0xb49 sys/net/route.c:1078 rtm_output(ffff800000e1d300,ffff800037887090,ffff800037886fe8,0,0) at rtm_output+0x614 sys/net/rtsock.c:959 route_output(fffffd806e1fb100,fffffd806fcc97b8) at route_output+0x6bb sys/net/rtsock.c:864 route_send(fffffd806fcc97b8,fffffd806e1fb100,0,0) at route_send+0x8f sys/net/rtsock.c:340 sosend(fffffd806fcc97b8,0,ffff800037887248,0,0,0) at sosend+0x663 sendit(ffff80002a6df730,3,ffff800037887340,0,ffff8000378873f0) at sendit+0x54c sys/kern/uipc_syscalls.c:786 sys_sendto(ffff80002a6df730,ffff8000378874a0,ffff8000378873f0) at sys_sendto+0x84 sys/kern/uipc_syscalls.c:564 syscall(ffff8000378874a0) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa9bedf09d30, count: -12 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800037886d70 rbx 0xffff8000006bac80 rdx 0xffff800000e2e780 rcx 0 rax 0xffff80002a6df730 r8 0x101010101010101 r9 0x8080808080808080 r10 0x3fb897681a93fa8e r11 0x38eeb7c08c15f6c9 r12 0 r13 0x10000 __ALIGN_SIZE+0xf000 r14 0 r15 0x1 rip 0xffffffff82808dcc db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800037886d60 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb> show proc PROC (syz-executor.5) tid=230545 pid=79537 tcnt=2 stat=onproc flags process=8000000 proc=4000000 runpri=32, usrpri=82, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002a6de7d0,0xffff80002a6082b8 process=0xffff80002c11c450 user=0xffff800037882000, vmspace=0xfffffd806efcd160 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 9626 102438 49994 0 2 0x8000000 syz-executor.4 43352 454572 65375 0 2 0x8000480 syz-executor.7 43352 342404 65375 0 2 0xc000000 syz-executor.7 43352 132516 65375 0 3 0xc000000 inode syz-executor.7 43352 408212 65375 0 3 0xc000080 fsleep syz-executor.7 79537 456711 80686 0 2 0x8000000 syz-executor.5 *79537 230545 80686 0 7 0xc000000 syz-executor.5 65737 508521 75077 0 3 0x8000080 nanoslp syz-executor.1 65737 122526 75077 0 3 0xc000080 netcon syz-executor.1 65737 44871 75077 0 3 0xc000080 fsleep syz-executor.1 8496 367975 66961 0 2 0x8000480 syz-executor.0 8496 20848 66961 0 3 0xc000080 sbwait syz-executor.0 8496 303826 66961 0 3 0xc000080 pipewr syz-executor.0 8496 322902 66961 0 3 0xc000080 pipewr syz-executor.0 8496 241692 66961 0 3 0xc000080 fsleep syz-executor.0 64760 294380 0 0 3 0x14280 nfsidl nfsio 49372 367216 0 0 3 0x14280 nfsidl nfsio 62067 316487 0 0 3 0x14280 nfsidl nfsio 447 148167 0 0 3 0x14280 nfsidl nfsio 94613 495546 0 0 3 0x14280 nfsidl nfsio 54407 435783 0 0 3 0x14280 nfsidl nfsio 86978 272389 0 0 3 0x14280 nfsidl nfsio 92731 324923 0 0 3 0x14280 nfsidl nfsio 92605 169702 0 0 3 0x14280 nfsidl nfsio 73052 431785 0 0 3 0x14280 nfsidl nfsio 37161 409904 0 0 3 0x14280 nfsidl nfsio 71952 371168 0 0 3 0x14280 nfsidl nfsio 83160 75280 0 0 3 0x14280 nfsidl nfsio 71353 382587 0 0 3 0x14280 nfsidl nfsio 57482 286337 0 0 3 0x14280 nfsidl nfsio 82240 61316 0 0 3 0x14280 nfsidl nfsio 59197 491547 0 0 3 0x14280 nfsidl nfsio 66610 426457 0 0 3 0x14280 nfsidl nfsio 64522 422921 0 0 3 0x14280 nfsidl nfsio 58135 454286 0 0 3 0x14280 nfsidl nfsio 65375 308067 16143 0 3 0x8000082 nanoslp syz-executor.7 17964 321871 16143 0 3 0x8000082 nanoslp syz-executor.2 11014 90045 1 0 3 0x18100083 ttyin getty 80686 515989 16143 0 3 0x8000082 nanoslp syz-executor.5 66961 150365 16143 0 3 0x8000082 nanoslp syz-executor.0 5291 388636 0 0 3 0x14200 bored sosplice 46203 331688 77053 0 3 0x18100082 netio ndp 77053 164785 1 0 3 0x810008a sigsusp sh 49994 364866 16143 0 3 0x8000082 nanoslp syz-executor.4 75077 427935 16143 0 3 0x8000082 nanoslp syz-executor.1 16143 63607 93119 0 3 0x1a000082 wait syz-fuzzer 16143 102509 93119 0 2 0x1e000482 syz-fuzzer 16143 353533 93119 0 3 0x1e000082 wait syz-fuzzer 16143 337604 93119 0 3 0x1e000082 wait syz-fuzzer 16143 305184 93119 0 3 0x1e000082 thrsleep syz-fuzzer 16143 309995 93119 0 3 0x1e000082 thrsleep syz-fuzzer 16143 489612 93119 0 3 0x1e000082 wait syz-fuzzer 16143 248611 93119 0 3 0x1e000082 wait syz-fuzzer 16143 356814 93119 0 3 0x1e000082 thrsleep syz-fuzzer 16143 187540 93119 0 3 0x1e000082 kqread syz-fuzzer 16143 456792 93119 0 3 0x1e000082 thrsleep syz-fuzzer 16143 91637 93119 0 3 0x1e000082 wait syz-fuzzer 16143 134314 93119 0 3 0x1e000082 wait syz-fuzzer 16143 435275 93119 0 3 0x1e000082 thrsleep syz-fuzzer 93119 228770 7240 0 3 0x810008a sigsusp ksh 7240 444004 40046 0 3 0x1800009a kqread sshd 40046 156300 1 0 3 0x18000088 kqread sshd 53973 517215 30539 73 2 0x19100010 syslogd 30539 345877 1 0 3 0x18100082 sbwait syslogd 68813 487635 1 0 3 0x18100080 kqread resolvd 35830 58549 12158 77 3 0x18100092 kqread dhcpleased 8742 287379 12158 77 3 0x18100092 kqread dhcpleased 12158 6731 1 0 3 0x18000080 kqread dhcpleased 3418 450933 0 0 2 0x14200 smr 19909 168165 0 0 2 0x14200 zerothread 46095 61547 0 0 3 0x14200 aiodoned aiodoned 33188 185486 0 0 3 0x14200 syncer update 53432 188011 0 0 3 0x14200 cleaner cleaner 490 510823 0 0 3 0x14200 reaper reaper 6855 473382 0 0 3 0x14200 pgdaemon pagedaemon 65973 47663 0 0 3 0x14200 bored viomb 15469 60724 0 0 3 0x40014200 acpi0 acpi0 63299 103860 0 0 3 0x14200 bored softnet3 6360 90673 0 0 3 0x14200 bored softnet2 58912 423554 0 0 3 0x14200 bored softnet1 62510 139952 0 0 3 0x14200 bored softnet0 68746 208170 0 0 3 0x14200 bored systqmp 41073 502032 0 0 3 0x14200 bored systq 55797 410253 0 0 2 0x40014200 softclock 96770 282926 0 0 3 0x40014200 idle0 1 371588 0 0 3 0x8000082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10180 6557K 7183K 166960K 12972 0 pcb 15 10K 10K 166960K 94 0 rtable 248 9K 10K 166960K 652 0 pf 29 8K 9K 166960K 68 0 ifaddr 44 11K 11K 166960K 87 0 ifgroup 50 2K 2K 166960K 117 0 sysctl 3 0K 0K 166960K 3 0 counters 30 17K 17K 166960K 47 0 ioctlops 0 0K 2K 166960K 72 0 iov 0 0K 16K 166960K 88 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1404 88K 89K 166960K 2096 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 29 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 85 0 dirhash 12 2K 3K 166960K 36 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 16 57K 77K 166960K 1132 0 sigio 0 0K 0K 166960K 20 0 proc 58 59K 83K 166960K 720 0 subproc 104 6K 6K 166960K 202 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 141 0 in_multi 99 7K 7K 166960K 207 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 545 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 308 120K 122K 166960K 11766 0 UVM aobj 49 2K 2K 166960K 57 0 pinsyscall 37 74K 100K 166960K 2441 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 57 0 NDP 11 0K 2K 166960K 58 0 temp 72 6803K 6874K 166960K 30377 0 kqueue 12 18K 29K 166960K 164 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 127 0 122 1 0 1 1 0 8 0 rtentry 112 207 0 94 4 0 4 4 0 8 0 unpcb 144 710 0 696 2 0 2 2 0 8 1 syncache 336 13 0 13 1 0 1 1 0 8 1 sackhl 24 1 0 1 1 0 1 1 0 8 1 tcpqe 32 91 0 91 1 0 1 1 0 8 1 tcpcb 808 458 0 446 5 0 5 5 0 8 2 arp 88 38 0 18 1 0 1 1 0 8 0 ipq 40 3 0 2 1 0 1 1 0 8 0 ipqe 40 47 0 46 1 0 1 1 0 8 0 inpcb 360 1217 0 1199 14 4 10 14 0 8 7 nd6 104 48 0 24 1 0 1 1 0 8 0 pkpcb 40 6 0 6 1 0 1 1 0 8 1 kcovpl 48 15 0 7 1 0 1 1 0 8 0 ppxss 1072 3 0 3 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 791 0 327 30 0 30 30 0 8 0 art_table 32 792 0 327 4 0 4 4 0 8 0 art_node 16 204 0 104 1 0 1 1 0 8 0 sysvmsgpl 40 42 0 26 1 0 1 1 0 8 0 semupl 112 5 0 5 1 0 1 1 0 8 1 semapl 112 80 0 70 1 0 1 1 0 8 0 shmpl 112 54 0 8 2 0 2 2 0 8 0 dirhash 1024 33 0 16 3 0 3 3 0 8 0 dino2pl 256 3047 0 1532 96 0 96 96 0 8 0 ffsino 240 3047 0 1532 90 0 90 90 0 8 0 nchpl 144 4688 0 2954 66 0 66 66 0 8 0 uvmvnodes 80 3702 0 0 76 0 76 76 0 8 0 vnodes 216 3702 0 0 206 0 206 206 0 8 0 namei 1024 15464 0 15464 2 0 2 2 0 8 2 vcpupl 2048 3 0 0 1 0 1 1 0 8 0 vmpool 664 7 0 4 1 0 1 1 0 8 0 kstatmem 264 56 0 34 2 0 2 2 0 8 0 scxspl 216 19902 0 19902 8 0 8 8 1 8 8 plimitpl 152 142 0 126 1 0 1 1 0 8 0 sigapl 424 1436 0 1371 8 0 8 8 0 8 0 futexpl 64 16036 0 16033 1 0 1 1 0 8 0 knotepl 120 12442 0 12360 11 0 11 11 0 8 7 kqueuepl 184 293 0 285 4 0 4 4 0 8 3 pipepl 288 232 0 204 3 0 3 3 0 8 0 fdescpl 432 1399 0 1372 4 0 4 4 0 8 0 filepl 120 7567 0 7319 14 0 14 14 0 8 6 lockfpl 104 319 0 316 1 0 1 1 0 8 0 lockfspl 48 143 0 140 1 0 1 1 0 8 0 sessionpl 144 31 0 15 1 0 1 1 0 8 0 pgrppl 48 45 0 29 1 0 1 1 0 8 0 ucredpl 104 988 0 978 1 0 1 1 0 8 0 zombiepl 144 1373 0 1371 1 0 1 1 0 8 0 processpl 1072 1436 0 1371 5 0 5 5 0 8 0 procpl 656 2595 0 2507 8 0 8 8 0 8 0 sosppl 168 20 0 20 1 0 1 1 0 8 1 sockpl 488 2077 0 2041 21 8 13 21 0 8 7 mcl64k 65536 48 0 47 1 0 1 1 0 8 0 mcl16k 16384 37 0 37 1 0 1 1 0 8 1 mcl12k 12288 46 0 46 1 0 1 1 0 8 1 mcl9k 9216 8 0 8 1 0 1 1 0 8 1 mcl8k 8192 76 0 76 1 0 1 1 0 8 1 mcl4k 4096 190 0 190 1 0 1 1 0 8 1 mcl2k2 2112 20 0 20 1 0 1 1 0 8 1 mcl2k 2048 23768 0 23722 41 27 14 30 0 8 7 mtagpl 96 95 0 41 2 0 2 2 0 8 0 mbufpl 256 52556 0 52327 104 76 28 63 0 8 8 bufpl 280 6962 0 633 453 0 453 453 0 8 0 anonpl 24 300197 0 293910 77 0 77 77 0 188 34 amapchunkpl 152 38423 0 37783 43 0 43 43 0 158 14 amappl16 200 7230 0 7091 24 8 16 20 0 8 8 amappl15 192 10 0 10 1 0 1 1 0 8 1 amappl14 184 180 0 167 2 0 2 2 0 8 1 amappl13 176 9 0 9 1 0 1 1 0 8 1 amappl12 168 2158 0 2124 2 0 2 2 0 8 0 amappl11 160 69 0 59 1 0 1 1 0 8 0 amappl10 152 52 0 43 1 0 1 1 0 8 0 amappl9 144 192 0 192 1 0 1 1 0 8 1 amappl8 136 181 0 123 3 0 3 3 0 8 0 amappl7 128 99 0 88 1 0 1 1 0 8 0 amappl6 120 418 0 400 2 0 2 2 0 8 1 amappl5 112 202 0 190 1 0 1 1 0 8 0 amappl4 104 586 0 551 2 0 2 2 0 8 0 amappl3 96 8003 0 7928 3 0 3 3 0 8 0 amappl2 88 1879 0 1809 4 0 4 4 0 8 2 amappl1 80 13664 0 13153 22 2 20 22 0 8 8 amappl 88 11112 0 10920 6 0 6 6 0 92 1 dma4096 4096 1 0 1 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 0 1 1 0 8 1 dma128 128 253 0 253 1 0 1 1 0 8 1 dma64 64 6 0 6 1 0 1 1 0 8 1 dma32 32 7 0 7 1 0 1 1 0 8 1 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 56 0 8 1 0 1 1 0 8 0 uaddrrnd 24 1406 0 1376 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1406 0 1376 1 0 1 1 0 8 0 vmmpekpl 168 14045 0 13983 3 0 3 3 0 8 0 vmmpepl 168 105290 0 103400 111 0 111 111 0 357 21 vmsppl 344 1405 0 1376 3 0 3 3 0 8 0 rwobjpl 24 36017 0 31134 30 0 30 30 0 8 0 pdppl 4096 2818 0 2755 139 72 67 70 0 8 4 pvpl 32 727846 0 715516 360 11 349 360 0 265 233 pmappl 216 1405 0 1376 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 523 0 175 11 0 11 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82931932) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828e4822,ffffffff828924fc,436,ffffffff8285638c) at __assert+0x29 sys/kern/subr_prf.c:157 rtrequest(1,ffff800037886fe8,0,ffff800037886f60,0) at rtrequest+0xb49 sys/net/route.c:1078 rtm_output(ffff800000e1d300,ffff800037887090,ffff800037886fe8,0,0) at rtm_output+0x614 sys/net/rtsock.c:959 route_output(fffffd806e1fb100,fffffd806fcc97b8) at route_output+0x6bb sys/net/rtsock.c:864 route_send(fffffd806fcc97b8,fffffd806e1fb100,0,0) at route_send+0x8f sys/net/rtsock.c:340 sosend(fffffd806fcc97b8,0,ffff800037887248,0,0,0) at sosend+0x663 sendit(ffff80002a6df730,3,ffff800037887340,0,ffff8000378873f0) at sendit+0x54c sys/kern/uipc_syscalls.c:786 sys_sendto(ffff80002a6df730,ffff8000378874a0,ffff8000378873f0) at sys_sendto+0x84 sys/kern/uipc_syscalls.c:564 syscall(ffff8000378874a0) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa9bedf09d30, count: -12 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82931932) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828e4822,ffffffff828924fc,436,ffffffff8285638c) at __assert+0x29 sys/kern/subr_prf.c:157 rtrequest(1,ffff800037886fe8,0,ffff800037886f60,0) at rtrequest+0xb49 sys/net/route.c:1078 rtm_output(ffff800000e1d300,ffff800037887090,ffff800037886fe8,0,0) at rtm_output+0x614 sys/net/rtsock.c:959 route_output(fffffd806e1fb100,fffffd806fcc97b8) at route_output+0x6bb sys/net/rtsock.c:864 route_send(fffffd806fcc97b8,fffffd806e1fb100,0,0) at route_send+0x8f sys/net/rtsock.c:340 sosend(fffffd806fcc97b8,0,ffff800037887248,0,0,0) at sosend+0x663 sendit(ffff80002a6df730,3,ffff800037887340,0,ffff8000378873f0) at sendit+0x54c sys/kern/uipc_syscalls.c:786 sys_sendto(ffff80002a6df730,ffff8000378874a0,ffff8000378873f0) at sys_sendto+0x84 sys/kern/uipc_syscalls.c:564 syscall(ffff8000378874a0) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa9bedf09d30, count: -12