login: panic: kernel diagnostic assertion "cifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/route.c", line 951 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *215627 8755 0 0x10 0x4000000 0K syz-executor.0 522355 23078 0 0x2 0x4000000 1 syz-fuzzer 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(ffffffff82207482,ffffffff821cfeda,3b7,ffffffff821e5fff) at __assert+0x2b sys/kern/subr_prf.c:154 rtrequest(1,ffff800022d55708,4,ffff800022d557d8,0) at rtrequest+0xbf1 sys/net/route.c:951 rt_ifa_add(ffff800000adda00,840100,ffff800000adda58,0) at rt_ifa_add+0x290 sys/net/route.c:1133 in_ifinit(ffff800000ac3800,ffff800000adda00,ffff800022d55ab0,0) at in_ifinit+0x37a in_insert_prefix sys/netinet/in.c:717 [inline] in_ifinit(ffff800000ac3800,ffff800000adda00,ffff800022d55ab0,0) at in_ifinit+0x37a sys/netinet/in.c:648 in_ioctl_sifaddr(8020690c,ffff800022d55aa0,ffff800000ac3800,1) at in_ioctl_sifaddr+0x208 sys/netinet/in.c:360 in_ioctl(8020690c,ffff800022d55aa0,ffff800000ac3800,1) at in_ioctl+0x1e7 sys/netinet/in.c:231 ifioctl(fffffd8078674c68,8020690c,ffff800022d55aa0,ffff800020ab0018) at ifioctl+0xb64 sys/net/if.c:2202 sys_ioctl(ffff800020ab0018,ffff800022d55bb8,ffff800022d55c00) at sys_ioctl+0x5b9 syscall(ffff800022d55c80) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022d55c80) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff36,0,3,d153a2e010) at Xsyscall+0x128 end of kernel end trace frame: 0xd3893ddba0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic kernel diagnostic assertion "cifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/route.c", line 951 ddb{0}> 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(ffffffff82207482,ffffffff821cfeda,3b7,ffffffff821e5fff) at __assert+0x2b sys/kern/subr_prf.c:154 rtrequest(1,ffff800022d55708,4,ffff800022d557d8,0) at rtrequest+0xbf1 sys/net/route.c:951 rt_ifa_add(ffff800000adda00,840100,ffff800000adda58,0) at rt_ifa_add+0x290 sys/net/route.c:1133 in_ifinit(ffff800000ac3800,ffff800000adda00,ffff800022d55ab0,0) at in_ifinit+0x37a in_insert_prefix sys/netinet/in.c:717 [inline] in_ifinit(ffff800000ac3800,ffff800000adda00,ffff800022d55ab0,0) at in_ifinit+0x37a sys/netinet/in.c:648 in_ioctl_sifaddr(8020690c,ffff800022d55aa0,ffff800000ac3800,1) at in_ioctl_sifaddr+0x208 sys/netinet/in.c:360 in_ioctl(8020690c,ffff800022d55aa0,ffff800000ac3800,1) at in_ioctl+0x1e7 sys/netinet/in.c:231 ifioctl(fffffd8078674c68,8020690c,ffff800022d55aa0,ffff800020ab0018) at ifioctl+0xb64 sys/net/if.c:2202 sys_ioctl(ffff800020ab0018,ffff800022d55bb8,ffff800022d55c00) at sys_ioctl+0x5b9 syscall(ffff800022d55c80) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022d55c80) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff36,0,3,d153a2e010) at Xsyscall+0x128 end of kernel end trace frame: 0xd3893ddba0, count: -12 ddb{0}> show registers rdi 0xffffffff81b684c7 db_enter+0x17 rsi 0x49bd __ALIGN_SIZE+0x39bd rbp 0xffff800022d55520 rbx 0xffff800022d555d0 rdx 0x49be __ALIGN_SIZE+0x39be rcx 0xffff800020d50000 rax 0xffff800020d50000 r8 0xffffffff813d3def kprintf+0x16f r9 0x1 r10 0x25 r11 0x2709592d3bceb55a r12 0x3000000008 r13 0xffff800022d55530 r14 0x100 r15 0x1 rip 0xffffffff81b684c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022d55510 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=215627 stat=onproc flags process=10 proc=4000000 pri=81, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab0780,0xffff800020ab13e8 process=0xffff800020a8b510 user=0xffff800022d50000, vmspace=0xfffffd807f00a5c0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 8755 109057 4183 0 2 0x10 syz-executor.0 * 8755 215627 4183 0 7 0x4000010 syz-executor.0 8755 459019 4183 0 3 0x4000090 fsleep syz-executor.0 8755 473132 4183 0 3 0x4000090 fsleep syz-executor.0 73604 195632 23078 0 2 0x2 syz-executor.1 1942 234122 0 0 3 0x14200 acct acct 71466 500097 1 0 3 0x100083 ttyin getty 4183 379187 23078 0 3 0x82 nanosleep syz-executor.0 81115 294428 0 0 3 0x14200 bored sosplice 23078 393996 43578 0 3 0x82 thrsleep syz-fuzzer 23078 159041 43578 0 3 0x4000082 nanosleep syz-fuzzer 23078 82476 43578 0 3 0x4000082 thrsleep syz-fuzzer 23078 305730 43578 0 3 0x4000082 kqread syz-fuzzer 23078 346633 43578 0 3 0x4000082 thrsleep syz-fuzzer 23078 294682 43578 0 3 0x4000082 thrsleep syz-fuzzer 23078 303331 43578 0 3 0x4000082 thrsleep syz-fuzzer 23078 522355 43578 0 7 0x4000002 syz-fuzzer 23078 251865 43578 0 3 0x4000082 thrsleep syz-fuzzer 23078 151601 43578 0 3 0x4000082 thrsleep syz-fuzzer 43578 227684 4013 0 3 0x10008a pause ksh 4013 311388 90376 0 3 0x92 select sshd 90376 411798 1 0 3 0x80 select sshd 91193 364848 26112 74 3 0x100092 bpf pflogd 26112 14295 1 0 3 0x80 netio pflogd 20953 38368 37968 73 3 0x100090 kqread syslogd 37968 177474 1 0 3 0x100082 netio syslogd 23944 467616 1 77 3 0x100090 poll dhclient 63877 514091 1 0 3 0x80 poll dhclient 39469 69732 0 0 2 0x14200 zerothread 65934 91385 0 0 3 0x14200 aiodoned aiodoned 6183 477148 0 0 3 0x14200 syncer update 38063 379398 0 0 3 0x14200 cleaner cleaner 46538 426388 0 0 3 0x14200 reaper reaper 4580 298251 0 0 3 0x14200 pgdaemon pagedaemon 96628 237348 0 0 3 0x14200 bored crynlk 31687 205379 0 0 3 0x14200 bored crypto 8728 281728 0 0 3 0x40014200 acpi0 acpi0 78945 238071 0 0 3 0x40014200 idle1 40726 515250 0 0 3 0x14200 bored softnet 43544 229174 0 0 2 0x14200 systqmp 36540 496171 0 0 3 0x14200 bored systq 41887 6784 0 0 3 0x40014200 bored softclock 15640 78200 0 0 3 0x40014200 idle0 67815 443754 0 0 3 0x14200 bored smr 1 292060 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 8755 (syz-executor.0) thread 0xffff800020ab0018 (215627) exclusive rwlock netlock r = 0 (0xffffffff8251ee48) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 in_ioctl_sifaddr+0x69 #2 in_ioctl+0x1e7 sys/netinet/in.c:231 #3 ifioctl+0xb64 sys/net/if.c:2202 #4 sys_ioctl+0x5b9 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82653f78) #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 73604 (syz-executor.1) thread 0xffff800020ab18c8 (195632) exclusive rrwlock inode r = 0 (0xfffffd806ac6bb38) #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:562 #5 vget+0x1c3 sys/kern/vfs_subr.c:672 #6 ufs_ihashget+0x141 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x74 sys/ufs/ffs/ffs_vfsops.c:1323 #8 ufs_lookup+0x14b4 sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:91 #10 vfs_lookup+0x7a6 sys/kern/vfs_lookup.c:568 #11 namei+0x63c sys/kern/vfs_lookup.c:249 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1785 #13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806ac6bf78) #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:562 #5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419 #6 namei+0x63c sys/kern/vfs_lookup.c:249 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1785 #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9592 6457K 7670K 78643K 36388 0 0 pcb 13 8K 8K 78643K 394 0 0 rtable 118 13K 14K 78643K 1779 0 0 ifaddr 88 20K 22K 78643K 535 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1549 0 0 iov 0 0K 28K 78643K 404 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1225 77K 77K 78643K 8474 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 30 0 0 VM map 2 1K 1K 78643K 8 0 0 sem 12 0K 0K 78643K 1556 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 3878 0 0 sigio 0 0K 0K 78643K 34 0 0 proc 62 63K 95K 78643K 1367 0 0 subproc 32 2K 2K 78643K 325 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 160 0 0 in_multi 30 2K 2K 78643K 319 0 0 ether_multi 1 0K 0K 78643K 16 0 0 mrt 0 0K 0K 78643K 6 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 90 397K 397K 78643K 90 0 0 exec 0 0K 1K 78643K 603 0 0 pfkey data 0 0K 0K 78643K 2 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 121 22K 31K 78643K 13182 0 0 UVM aobj 106 5K 5K 78643K 115 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 0K 78643K 335 0 0 NDP 21 0K 0K 78643K 175 0 0 temp 235 3565K 3635K 78643K 61056 0 0 kqueue 0 0K 0K 78643K 10 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 58 0 51 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 168 0 166 1 0 1 1 0 8 0 rtentry 112 279 0 236 2 0 2 2 0 8 0 unpcb 120 892 0 877 2 1 1 2 0 8 0 syncache 264 9 0 9 5 5 0 1 0 8 0 sackhl 24 2 0 2 2 2 0 1 0 8 0 tcpqe 32 6002 0 6002 3 3 0 1 0 8 0 tcpcb 544 668 0 663 2 1 1 2 0 8 0 inpcb 280 5225 0 5211 13 11 2 4 0 8 1 rttmr 72 2 0 2 2 2 0 1 0 8 0 nd6 48 40 0 37 1 0 1 1 0 8 0 pkpcb 40 11 0 11 4 4 0 1 0 8 0 swfcl 56 1 0 0 1 0 1 1 0 8 0 ppxss 1128 74 0 74 11 10 1 1 0 8 1 pffrag 232 26 0 26 9 8 1 1 0 482 1 pffrnode 88 26 0 26 9 8 1 1 0 8 1 pffrent 40 311 0 311 9 8 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 24 153 0 113 1 0 1 1 0 8 0 pfstkey 112 153 0 113 2 0 2 2 0 8 0 pfstate 328 153 0 113 5 1 4 4 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 3 0 2 3 2 1 3 0 8 0 art_heap4 256 1151 0 933 24 8 16 16 0 8 0 art_table 32 1154 0 935 2 0 2 2 0 8 0 art_node 16 276 0 236 1 0 1 1 0 8 0 sysvmsgpl 40 111 0 81 1 0 1 1 0 8 0 semapl 112 1554 0 1544 1 0 1 1 0 8 0 shmpl 112 113 0 9 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 6566 0 5163 46 0 46 46 0 8 0 ffsino 272 6566 0 5163 94 0 94 94 0 8 0 nchpl 144 13840 0 13373 61 41 20 61 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 43801 0 43801 4 3 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vmpool 552 6 0 6 3 3 0 1 0 8 0 scsiplug 64 5 0 5 4 4 0 1 0 8 0 scxspl 192 34690 0 34690 28 26 2 7 0 8 2 plimitpl 152 226 0 218 1 0 1 1 0 8 0 sigapl 432 4029 0 4014 3 1 2 3 0 8 0 futexpl 56 79160 0 79158 1 0 1 1 0 8 0 knotepl 112 578 0 559 1 0 1 1 0 8 0 kqueuepl 104 2144 0 2140 1 0 1 1 0 8 0 pipepl 112 3924 0 3905 9 8 1 2 0 8 0 fdescpl 488 4030 0 4014 3 0 3 3 0 8 0 filepl 152 34464 0 34355 18 12 6 7 0 8 1 lockfpl 104 735 0 734 1 0 1 1 0 8 0 lockfspl 48 259 0 258 1 0 1 1 0 8 0 sessionpl 112 37 0 26 1 0 1 1 0 8 0 pgrppl 48 68 0 57 1 0 1 1 0 8 0 ucredpl 96 7059 0 7048 1 0 1 1 0 8 0 zombiepl 144 4014 0 4014 4 3 1 1 0 8 1 processpl 896 4047 0 4014 4 0 4 4 0 8 0 procpl 632 11591 0 11546 12 7 5 5 0 8 1 srpgc 64 32 0 32 12 12 0 1 0 8 0 sosppl 128 25 0 25 8 8 0 1 0 8 0 sockpl 384 6798 0 6767 25 20 5 7 0 8 1 mcl64k 65536 263 0 0 33 11 22 33 0 8 1 mcl16k 16384 8 0 0 1 0 1 1 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 14 0 0 1 0 1 1 0 8 0 mcl8k 8192 22 0 0 3 1 2 3 0 8 0 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 181 0 0 17 2 15 17 0 8 0 mtagpl 80 362 0 0 7 0 7 7 0 8 0 mbufpl 256 834 0 0 49 0 49 49 0 8 0 bufpl 256 13878 0 6830 441 0 441 441 0 8 0 anonpl 16 374338 0 358483 101 22 79 82 0 124 8 amapchunkpl 152 24261 0 24121 40 29 11 13 0 158 4 amappl16 192 17653 0 16730 93 41 52 59 0 8 5 amappl15 184 502 0 498 3 2 1 1 0 8 0 amappl14 176 1024 0 1021 2 1 1 1 0 8 0 amappl13 168 683 0 683 4 3 1 1 0 8 1 amappl12 160 458 0 456 1 0 1 1 0 8 0 amappl11 152 682 0 667 1 0 1 1 0 8 0 amappl10 144 146 0 142 1 0 1 1 0 8 0 amappl9 136 1450 0 1443 1 0 1 1 0 8 0 amappl8 128 957 0 924 4 2 2 2 0 8 0 amappl7 120 246 0 238 1 0 1 1 0 8 0 amappl6 112 664 0 651 1 0 1 1 0 8 0 amappl5 104 720 0 706 1 0 1 1 0 8 0 amappl4 96 4140 0 4104 1 0 1 1 0 8 0 amappl3 88 1338 0 1333 1 0 1 1 0 8 0 amappl2 80 30980 0 30903 4 2 2 3 0 8 0 amappl1 72 93543 0 93096 27 16 11 20 0 8 1 amappl 80 12128 0 12082 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 64 114 0 9 2 0 2 2 0 8 0 uaddrrnd 24 4036 0 4014 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4036 0 4014 1 0 1 1 0 8 0 vmmpekpl 168 37614 0 37579 2 0 2 2 0 8 0 vmmpepl 168 494345 0 492258 305 179 126 131 0 357 27 vmsppl 368 4029 0 4014 2 0 2 2 0 8 0 pdppl 4096 8079 0 8040 7 1 6 6 0 8 0 pvpl 32 1063516 0 1044395 284 92 192 195 0 265 28 pmappl 232 4035 0 4020 8 7 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 691 0 33 20 0 20 20 0 8 0