panic: kernel diagnostic assertion "cifp != NULL" failed: file "/syzkaller/managers/main/kernel/sys/net/route.c", line 954 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 83723 84657 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8276c0fa) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff827ec2fc,ffffffff827ab8a1,3ba,ffffffff827c3c52) at __assert+0x29 sys/kern/subr_prf.c:157 rtrequest(1,ffff800021738228,8,ffff8000217382d0,0) at rtrequest+0xb67 sys/net/route.c:954 rt_ifa_add(ffff800000d0e700,40004,ffff800000d0e768,0) at rt_ifa_add+0x1ac sys/net/route.c:1134 in_ifinit(ffff800021740b08,ffff800000d0e700,ffff8000217383f0,1) at in_ifinit+0x3bf pppx_add_session(ffff800000d61c00,ffff800000687c00) at pppx_add_session+0x35e sys/net/if_pppx.c:731 VOP_IOCTL(fffffd806d11b1f8,82907003,ffff800000687c00,81,fffffd807f7d7478,ffff800024bd1338) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd80648c1630,82907003,ffff800000687c00,ffff800024bd1338) at vn_ioctl+0xbb sys/kern/vfs_vnops.c:525 sys_ioctl(ffff800024bd1338,ffff800021738730,ffff800021738780) at sys_ioctl+0x49e syscall(ffff800021738800) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:632 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb2267ef5230, 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 954 ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8276c0fa) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff827ec2fc,ffffffff827ab8a1,3ba,ffffffff827c3c52) at __assert+0x29 sys/kern/subr_prf.c:157 rtrequest(1,ffff800021738228,8,ffff8000217382d0,0) at rtrequest+0xb67 sys/net/route.c:954 rt_ifa_add(ffff800000d0e700,40004,ffff800000d0e768,0) at rt_ifa_add+0x1ac sys/net/route.c:1134 in_ifinit(ffff800021740b08,ffff800000d0e700,ffff8000217383f0,1) at in_ifinit+0x3bf pppx_add_session(ffff800000d61c00,ffff800000687c00) at pppx_add_session+0x35e sys/net/if_pppx.c:731 VOP_IOCTL(fffffd806d11b1f8,82907003,ffff800000687c00,81,fffffd807f7d7478,ffff800024bd1338) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd80648c1630,82907003,ffff800000687c00,ffff800024bd1338) at vn_ioctl+0xbb sys/kern/vfs_vnops.c:525 sys_ioctl(ffff800024bd1338,ffff800021738730,ffff800021738780) at sys_ioctl+0x49e syscall(ffff800021738800) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:632 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb2267ef5230, count: -12 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800021738030 rbx 0x10000 __ALIGN_SIZE+0xf000 rdx 0xffff800000dd91c0 rcx 0 rax 0xffff800024bd1338 r8 0 r9 0x8080808080808080 r10 0x20e682b343cf9de5 r11 0xcf118283d5e3a168 r12 0 r13 0xffff800021738228 r14 0 r15 0x1 rip 0xffffffff812a662c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800021738020 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=83723 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=59, nice=20 forw=0xffffffffffffffff, list=0xffff800024bd0b10,0xffffffff82d09490 process=0xffff8000ffff33b0 user=0xffff800021733000, vmspace=0xfffffd8069cc55d0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 84657 487226 57791 0 2 0 syz-executor.1 *84657 83723 57791 0 7 0x4000000 syz-executor.1 85315 486403 97272 0 2 0 syz-executor.6 85315 205653 97272 0 3 0x4000080 fsleep syz-executor.6 83229 226240 52820 60928 2 0x10 syz-executor.2 83229 490930 52820 60928 3 0x4000090 fsleep syz-executor.2 83229 112250 52820 60928 3 0x4000090 fsleep syz-executor.2 79851 505945 57942 0 2 0x480 syz-executor.7 79851 464765 57942 0 3 0x4000080 fsleep syz-executor.7 57791 238329 70908 0 2 0x482 syz-executor.1 57162 243917 70908 0 2 0x2 syz-executor.3 5193 182297 70908 0 3 0x82 piperd syz-executor.4 15659 346299 1 0 3 0x100083 ttyin getty 52820 513356 70908 0 3 0x82 nanoslp syz-executor.2 55220 455611 70908 0 3 0x82 piperd syz-executor.0 40343 185707 0 0 3 0x14200 bored sosplice 97272 380270 70908 0 2 0x482 syz-executor.6 57942 178477 70908 0 2 0x482 syz-executor.7 70908 115320 72850 0 3 0x82 wait syz-fuzzer 70908 87296 72850 0 3 0x4000082 nanoslp syz-fuzzer 70908 145868 72850 0 3 0x4000082 thrsleep syz-fuzzer 70908 251551 72850 0 3 0x4000082 wait syz-fuzzer 70908 116260 72850 0 2 0x4000002 syz-fuzzer 70908 249269 72850 0 3 0x4000082 wait syz-fuzzer 70908 295202 72850 0 3 0x4000082 thrsleep syz-fuzzer 70908 450844 72850 0 3 0x4000082 wait syz-fuzzer 70908 126542 72850 0 3 0x4000082 wait syz-fuzzer 70908 20081 72850 0 3 0x4000082 wait syz-fuzzer 70908 330106 72850 0 3 0x4000082 thrsleep syz-fuzzer 70908 11873 72850 0 3 0x4000082 wait syz-fuzzer 70908 465485 72850 0 3 0x4000082 wait syz-fuzzer 70908 29401 72850 0 3 0x4000082 thrsleep syz-fuzzer 72850 137786 81036 0 3 0x10008a sigsusp ksh 81036 12717 85024 0 3 0x9a kqread sshd 85024 402949 1 0 3 0x88 kqread sshd 8522 248881 51402 73 3 0x1100090 kqread syslogd 51402 374103 1 0 3 0x100082 netio syslogd 95134 507764 1 0 2 0x100080 resolvd 18378 34770 26237 77 2 0x100092 dhcpleased 90892 143021 26237 77 3 0x100092 kqread dhcpleased 26237 155642 1 0 3 0x80 kqread dhcpleased 51674 180738 0 0 3 0x14200 bored smr 18795 387608 0 0 2 0x14200 zerothread 26941 216465 0 0 3 0x14200 aiodoned aiodoned 10847 501056 0 0 3 0x14200 syncer update 10067 238502 0 0 3 0x14200 cleaner cleaner 10684 398007 0 0 3 0x14200 reaper reaper 72918 128040 0 0 3 0x14200 pgdaemon pagedaemon 98986 488458 0 0 3 0x14200 bored viomb 76933 45884 0 0 3 0x40014200 acpi0 acpi0 4284 355137 0 0 3 0x14200 bored softnet3 70243 293286 0 0 3 0x14200 bored softnet2 30541 66675 0 0 3 0x14200 bored softnet1 47816 129121 0 0 3 0x14200 bored softnet0 39345 335761 0 0 3 0x14200 bored systqmp 88899 367196 0 0 3 0x14200 bored systq 13304 440772 0 0 2 0x40014200 softclock 11231 474677 0 0 3 0x40014200 idle0 1 54169 0 0 3 0x82 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 10198 6683K 7003K 78643K 15763 0 pcb 13 14K 16K 78643K 924 0 rtable 188 15K 15K 78643K 1035 0 pf 42 11K 1038K 78643K 4974 0 ifaddr 44 11K 11K 78643K 182 0 ifgroup 71 2K 2K 78643K 290 0 sysctl 2 0K 0K 78643K 2 0 counters 32 17K 17K 78643K 179 0 ioctlops 1 1K 2K 78643K 422 0 iov 0 0K 24K 78643K 680 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1467 92K 92K 78643K 3664 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 68 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 966 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 14 49K 81K 78643K 4194 0 sigio 0 0K 0K 78643K 206 0 proc 61 59K 75K 78643K 884 0 subproc 104 6K 6K 78643K 208 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 121 0 in_multi 70 5K 7K 78643K 364 0 ether_multi 1 0K 0K 78643K 24 0 mrt 0 0K 0K 78643K 21 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 61 281K 281K 78643K 61 0 exec 0 0K 1K 78643K 1363 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 354 90K 104K 78643K 40832 0 UVM aobj 131 4K 4K 78643K 152 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 186 0 NDP 18 0K 1K 78643K 120 0 temp 75 5860K 14068K 78643K 39940 0 kqueue 13 20K 26K 78643K 382 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 448 0 445 8 7 1 3 0 8 0 rtentry 112 300 0 221 4 0 4 4 0 8 0 unpcb 144 4182 0 4163 38 37 1 6 0 8 0 syncache 296 17 0 17 6 6 0 1 0 8 0 tcpqe 32 195 0 195 5 5 0 1 0 8 0 tcpcb 776 1204 0 1200 45 43 2 8 0 8 1 arp 88 36 0 21 1 0 1 1 0 8 0 ipq 40 5 0 4 3 2 1 1 0 8 0 ipqe 40 80 0 79 3 2 1 1 0 8 0 inpcb 336 4143 0 4135 51 50 1 18 0 8 0 nd6 104 65 0 50 1 0 1 1 0 8 0 pkpcb 40 76 0 76 2 2 0 1 0 8 0 kcovpl 48 16 0 8 1 0 1 1 0 8 0 mppekey 1024 71 0 71 2 2 0 1 0 8 0 ppxss 1160 115 0 113 9 8 1 1 0 8 0 pppxif 1360 23 0 21 7 6 1 1 0 8 0 pfstscr 40 9 0 8 2 1 1 1 0 8 0 pfanchor 1288 962 3 512 46 3 43 43 0 8 0 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 128 12 0 10 2 1 1 1 0 8 0 pfstate 352 6 0 5 2 1 1 1 0 8 0 rttmr 136 6 0 6 2 2 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1407 0 1063 38 14 24 29 0 8 0 art_table 32 1408 0 1063 4 0 4 4 0 8 0 art_node 16 296 0 228 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 5 1 0 1 1 0 8 0 semapl 112 962 0 952 1 0 1 1 0 8 0 shmpl 112 149 0 21 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 7089 0 5648 91 0 91 91 0 8 0 ffsino 240 7089 0 5648 86 0 86 86 0 8 0 nchpl 144 13066 0 12565 63 41 22 63 0 8 0 uvmvnodes 80 8828 0 0 181 0 181 181 0 8 0 vnodes 216 8828 0 0 491 0 491 491 0 8 0 namei 1024 52258 0 52257 4 3 1 3 0 8 0 kstatmem 264 150 0 118 5 2 3 3 0 8 0 scsiplug 72 9 0 9 3 3 0 1 0 8 0 scxspl 216 36274 0 36274 13 12 1 8 0 8 1 plimitpl 152 650 0 635 1 0 1 1 0 8 0 sigapl 424 4478 0 4436 6 0 6 6 0 8 0 futexpl 64 46569 0 46565 1 0 1 1 0 8 0 knotepl 120 74647 0 74568 50 46 4 16 0 8 1 kqueuepl 184 935 0 926 18 17 1 4 0 8 0 pipepl 288 925 0 898 22 19 3 7 0 8 0 fdescpl 432 4461 0 4436 4 0 4 4 0 8 0 filepl 120 37381 0 37132 45 36 9 16 0 8 0 lockfpl 104 1011 0 1009 1 0 1 1 0 8 0 lockfspl 48 356 0 354 1 0 1 1 0 8 0 sessionpl 144 33 0 17 1 0 1 1 0 8 0 pgrppl 48 51 0 35 1 0 1 1 0 8 0 ucredpl 104 4092 0 4078 1 0 1 1 0 8 0 zombiepl 144 4437 0 4436 1 0 1 1 0 8 0 processpl 1008 4478 0 4436 8 2 6 7 0 8 0 procpl 696 10717 0 10657 15 8 7 9 0 8 0 sosppl 168 31 0 31 4 4 0 1 0 8 0 sockpl 456 8884 0 8854 139 133 6 28 0 8 2 mcl64k 65536 235 0 235 4 3 1 1 0 8 1 mcl16k 16384 115 0 115 9 8 1 1 0 8 1 mcl12k 12288 154 0 154 5 4 1 1 0 8 1 mcl9k 9216 85 0 85 8 8 0 1 0 8 0 mcl8k 8192 329 0 329 2 1 1 1 0 8 1 mcl4k 4096 481 0 481 3 2 1 1 0 8 1 mcl2k2 2112 26 0 26 8 7 1 1 0 8 1 mcl2k 2048 79628 0 79579 40 32 8 30 0 8 0 mtagpl 96 465 0 422 6 2 4 4 0 8 0 mbufpl 256 184873 0 184738 637 610 27 144 0 8 3 bufpl 288 10080 0 3695 457 0 457 457 0 8 0 anonpl 24 584345 0 571733 168 54 114 120 0 188 5 amapchunkpl 152 130910 0 130056 63 24 39 47 0 158 4 amappl16 200 14171 0 13725 76 49 27 37 0 8 2 amappl15 192 21 0 21 1 1 0 1 0 8 0 amappl14 184 184 0 168 2 1 1 2 0 8 0 amappl13 176 19 0 18 1 0 1 1 0 8 0 amappl12 168 5207 0 5180 2 0 2 2 0 8 0 amappl11 160 55 0 45 1 0 1 1 0 8 0 amappl10 152 51 0 41 2 1 1 1 0 8 0 amappl9 144 166 0 165 2 1 1 2 0 8 0 amappl8 136 284 0 211 3 0 3 3 0 8 0 amappl7 128 85 0 66 1 0 1 1 0 8 0 amappl6 120 393 0 375 2 1 1 2 0 8 0 amappl5 112 228 0 222 1 0 1 1 0 8 0 amappl4 104 782 0 748 2 1 1 2 0 8 0 amappl3 96 25906 0 25828 3 0 3 3 0 8 0 amappl2 88 4781 0 4725 4 2 2 3 0 8 0 amappl1 80 24925 0 24426 22 10 12 22 0 8 0 amappl 88 40124 0 39897 7 1 6 7 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 72 151 0 21 3 0 3 3 0 8 0 uaddrrnd 24 4461 0 4436 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4461 0 4436 1 0 1 1 0 8 0 vmmpekpl 168 35515 0 35458 3 0 3 3 0 8 0 vmmpepl 168 283821 0 281653 234 117 117 152 0 357 11 vmsppl 368 4460 0 4436 3 0 3 3 0 8 0 rwobjpl 24 81538 0 71116 63 0 63 63 0 8 0 pdppl 4096 8928 0 8872 244 182 62 72 0 8 6 pvpl 32 1400983 0 1383277 377 177 200 335 0 265 16 pmappl 216 4460 0 4436 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1707 0 934 26 1 25 25 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(ffffffff8276c0fa) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff827ec2fc,ffffffff827ab8a1,3ba,ffffffff827c3c52) at __assert+0x29 sys/kern/subr_prf.c:157 rtrequest(1,ffff800021738228,8,ffff8000217382d0,0) at rtrequest+0xb67 sys/net/route.c:954 rt_ifa_add(ffff800000d0e700,40004,ffff800000d0e768,0) at rt_ifa_add+0x1ac sys/net/route.c:1134 in_ifinit(ffff800021740b08,ffff800000d0e700,ffff8000217383f0,1) at in_ifinit+0x3bf pppx_add_session(ffff800000d61c00,ffff800000687c00) at pppx_add_session+0x35e sys/net/if_pppx.c:731 VOP_IOCTL(fffffd806d11b1f8,82907003,ffff800000687c00,81,fffffd807f7d7478,ffff800024bd1338) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd80648c1630,82907003,ffff800000687c00,ffff800024bd1338) at vn_ioctl+0xbb sys/kern/vfs_vnops.c:525 sys_ioctl(ffff800024bd1338,ffff800021738730,ffff800021738780) at sys_ioctl+0x49e syscall(ffff800021738800) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:632 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb2267ef5230, 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(ffffffff8276c0fa) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff827ec2fc,ffffffff827ab8a1,3ba,ffffffff827c3c52) at __assert+0x29 sys/kern/subr_prf.c:157 rtrequest(1,ffff800021738228,8,ffff8000217382d0,0) at rtrequest+0xb67 sys/net/route.c:954 rt_ifa_add(ffff800000d0e700,40004,ffff800000d0e768,0) at rt_ifa_add+0x1ac sys/net/route.c:1134 in_ifinit(ffff800021740b08,ffff800000d0e700,ffff8000217383f0,1) at in_ifinit+0x3bf pppx_add_session(ffff800000d61c00,ffff800000687c00) at pppx_add_session+0x35e sys/net/if_pppx.c:731 VOP_IOCTL(fffffd806d11b1f8,82907003,ffff800000687c00,81,fffffd807f7d7478,ffff800024bd1338) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd80648c1630,82907003,ffff800000687c00,ffff800024bd1338) at vn_ioctl+0xbb sys/kern/vfs_vnops.c:525 sys_ioctl(ffff800024bd1338,ffff800021738730,ffff800021738780) at sys_ioctl+0x49e syscall(ffff800021738800) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:632 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb2267ef5230, count: -12