panic: kernel diagnostic assertion "ifp != NULL" failed: file "/syzkaller/managers/main/kernel/sys/net/rtsock.c", line 928 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *376105 17816 0 0 0x4000000 0 syz-executor.0 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(ffffffff821e9a97,ffffffff821a6bee,3a0,ffffffff821726e0) at __assert+0x2b sys/kern/subr_prf.c:154 rtm_output(ffff800000b95800,ffff8000189a4e60,ffff8000189a4db8,1b,5) at rtm_output+0xba9 sys/net/rtsock.c:1109 route_output(fffffd802ec30500,fffffd80294e3498,0,0) at route_output+0x609 sys/net/rtsock.c:819 route_usrreq(fffffd80294e3498,9,fffffd802ec30500,0,0,ffff80001491a9f8) at route_usrreq+0x363 sys/net/rtsock.c:275 sosend(fffffd80294e3498,0,ffff8000189a5040,0,0,80) at sosend+0x63d sys/kern/uipc_socket.c:524 sendit(ffff80001491a9f8,3,ffff8000189a5120,0,ffff8000189a5200) at sendit+0x52b sys/kern/uipc_syscalls.c:662 sys_sendto(ffff80001491a9f8,ffff8000189a51b8,ffff8000189a5200) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:527 syscall(ffff8000189a5280) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe00c9fa4f60, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic kernel diagnostic assertion "ifp != NULL" failed: file "/syzkaller/managers/main/kernel/sys/net/rtsock.c", line 928 ddb> 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(ffffffff821e9a97,ffffffff821a6bee,3a0,ffffffff821726e0) at __assert+0x2b sys/kern/subr_prf.c:154 rtm_output(ffff800000b95800,ffff8000189a4e60,ffff8000189a4db8,1b,5) at rtm_output+0xba9 sys/net/rtsock.c:1109 route_output(fffffd802ec30500,fffffd80294e3498,0,0) at route_output+0x609 sys/net/rtsock.c:819 route_usrreq(fffffd80294e3498,9,fffffd802ec30500,0,0,ffff80001491a9f8) at route_usrreq+0x363 sys/net/rtsock.c:275 sosend(fffffd80294e3498,0,ffff8000189a5040,0,0,80) at sosend+0x63d sys/kern/uipc_socket.c:524 sendit(ffff80001491a9f8,3,ffff8000189a5120,0,ffff8000189a5200) at sendit+0x52b sys/kern/uipc_syscalls.c:662 sys_sendto(ffff80001491a9f8,ffff8000189a51b8,ffff8000189a5200) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:527 syscall(ffff8000189a5280) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe00c9fa4f60, count: -11 ddb> show registers rdi 0xffffffff811e7a37 db_enter+0x17 rsi 0x3ec5 __ALIGN_SIZE+0x2ec5 rbp 0xffff8000189a4c30 rbx 0xffff8000189a4ce0 rdx 0x3ec6 __ALIGN_SIZE+0x2ec6 rcx 0xffff80001571c000 rax 0xffff80001571c000 r8 0xffff8000189a4bf0 r9 0x1 r10 0xffff800000b02f00 r11 0x58bddd01d764970 r12 0x3000000008 r13 0xffff8000189a4c40 r14 0x100 r15 0x1 rip 0xffffffff811e7a38 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000189a4c20 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=376105 stat=onproc flags process=0 proc=4000000 pri=62, usrpri=62, nice=20 forw=0xffffffffffffffff, list=0xffff80001491a018,0xffffffff82591710 process=0xffff8000148a26d8 user=0xffff8000189a0000, vmspace=0xfffffd803f011ee0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 17816 86530 59167 0 3 0x80 fsleep syz-executor.0 *17816 376105 59167 0 7 0x4000000 syz-executor.0 62392 256052 32577 0 3 0x80 fsleep syz-executor.1 62392 506481 32577 0 3 0x4000080 poll syz-executor.1 32577 287045 69388 0 3 0x82 nanosleep syz-executor.1 59167 142808 69388 0 3 0x82 nanosleep syz-executor.0 63388 271243 0 0 3 0x14200 acct acct 67441 319332 1 0 3 0x100083 ttyin getty 99967 102104 0 0 3 0x14200 bored sosplice 69388 64692 3214 0 3 0x82 thrsleep syz-fuzzer 69388 69730 3214 0 2 0x4000482 syz-fuzzer 69388 341790 3214 0 3 0x4000082 thrsleep syz-fuzzer 69388 267824 3214 0 3 0x4000082 thrsleep syz-fuzzer 69388 170796 3214 0 3 0x4000082 thrsleep syz-fuzzer 69388 349414 3214 0 3 0x4000082 thrsleep syz-fuzzer 69388 212533 3214 0 3 0x4000082 thrsleep syz-fuzzer 69388 62191 3214 0 3 0x4000082 kqread syz-fuzzer 69388 509735 3214 0 3 0x4000082 thrsleep syz-fuzzer 3214 476029 69100 0 3 0x10008a pause ksh 69100 88907 86 0 3 0x92 select sshd 86 238714 1 0 3 0x80 select sshd 55837 178156 31462 73 3 0x100090 kqread syslogd 31462 191701 1 0 3 0x100082 netio syslogd 59042 278517 1 77 3 0x100090 poll dhclient 23470 4731 1 0 3 0x80 poll dhclient 58409 369440 0 0 2 0x14200 zerothread 79257 21872 0 0 3 0x14200 aiodoned aiodoned 4287 366242 0 0 3 0x14200 syncer update 64231 441984 0 0 3 0x14200 cleaner cleaner 23734 434933 0 0 3 0x14200 reaper reaper 35693 184866 0 0 3 0x14200 pgdaemon pagedaemon 51545 128071 0 0 3 0x14200 bored crynlk 5831 143501 0 0 3 0x14200 bored crypto 7882 78045 0 0 3 0x40014200 acpi0 acpi0 13215 38199 0 0 3 0x14200 bored softnet 41945 220046 0 0 3 0x14200 bored systqmp 39966 15853 0 0 3 0x14200 bored systq 25649 151834 0 0 3 0x40014200 bored softclock 34754 114330 0 0 3 0x40014200 idle0 77524 245189 0 0 3 0x14200 bored smr 1 273463 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 Kern Lim devbuf 9593 6536K 9220K 78643K 41333 0 0 pcb 13 10K 12K 78643K 1290 0 0 rtable 135 7K 7K 78643K 3393 0 0 ifaddr 283 34K 35K 78643K 1163 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 0 0K 2K 78643K 347 0 0 iov 0 0K 32K 78643K 1230 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1231 77K 78K 78643K 11356 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 90 0 0 VM map 32 8K 8K 78643K 61 0 0 sem 12 1K 1K 78643K 1175 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1794 195K 288K 78643K 12646 0 0 file desc 6 17K 25K 78643K 5498 0 0 sigio 0 0K 0K 78643K 111 0 0 proc 50 38K 63K 78643K 2396 0 0 subproc 32 2K 2K 78643K 697 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 595 0 0 in_multi 318 16K 16K 78643K 974 0 0 ether_multi 1 0K 0K 78643K 48 0 0 mrt 0 0K 0K 78643K 54 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 132 583K 583K 78643K 132 0 0 exec 0 0K 1K 78643K 1312 0 0 pfkey data 0 0K 4K 78643K 8 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 191 252K 257K 78643K 15190 0 0 UVM aobj 130 6K 6K 78643K 136 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 1K 78643K 1241 0 0 NDP 21 0K 1K 78643K 284 0 0 temp 170 3536K 4175K 78643K 162765 0 0 kqueue 0 0K 0K 78643K 93 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 131 0 122 1 0 1 1 0 8 0 rtpcb 80 4713 0 4710 1 0 1 1 0 8 0 rtentry 112 665 0 614 2 0 2 2 0 8 0 unpcb 120 4463 0 4449 6 5 1 2 0 8 0 syncache 264 41 0 41 15 15 0 1 0 8 0 tcpqe 32 107 0 107 10 10 0 1 0 8 0 tcpcb 544 2857 0 2853 47 46 1 15 0 8 0 ipq 40 79 0 79 18 18 0 1 0 8 0 ipqe 40 2786 0 2786 18 18 0 1 0 8 0 inpcb 280 8932 0 8925 44 42 2 9 0 8 1 rttmr 72 17 0 16 4 3 1 1 0 8 0 ip6q 72 6 0 6 4 4 0 1 0 8 0 ip6af 40 15 0 15 3 3 0 1 0 8 0 nd6 48 105 0 101 3 2 1 1 0 8 0 pkpcb 40 50 0 50 16 16 0 1 0 8 0 ppxss 1128 83 0 83 19 18 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 3043 0 2743 51 32 19 21 0 8 0 art_table 32 3046 0 2743 4 1 3 3 0 8 0 art_node 16 659 0 612 1 0 1 1 0 8 0 sysvmsgpl 40 47 0 33 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 1173 0 1163 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 9754 0 8356 46 0 46 46 0 8 0 ffsino 240 9754 0 8356 83 0 83 83 0 8 0 nchpl 144 17716 0 17255 60 40 20 60 0 8 0 uvmvnodes 72 7614 0 0 139 0 139 139 0 8 0 vnodes 208 7614 0 0 401 0 401 401 0 8 0 namei 1024 70842 0 70842 4 3 1 1 0 8 1 vcpupl 1984 31 0 1 4 0 4 4 0 8 0 vmpool 520 59 0 29 4 2 2 3 0 8 0 scsiplug 64 7 0 7 6 6 0 1 0 8 0 scxspl 192 64655 0 64655 28 27 1 7 0 8 1 plimitpl 152 549 0 542 1 0 1 1 0 8 0 sigapl 432 5552 0 5538 2 0 2 2 0 8 0 futexpl 56 204635 0 204633 4 3 1 1 0 8 0 knotepl 112 3791 0 3772 10 9 1 3 0 8 0 kqueuepl 104 6157 0 6154 10 9 1 4 0 8 0 pipepl 128 3822 0 3803 21 19 2 2 0 8 1 fdescpl 424 5553 0 5538 2 0 2 2 0 8 0 filepl 120 63827 0 63728 52 48 4 11 0 8 0 lockfpl 104 2017 0 2016 1 0 1 1 0 8 0 lockfspl 48 642 0 641 1 0 1 1 0 8 0 sessionpl 112 57 0 47 1 0 1 1 0 8 0 pgrppl 48 137 0 127 1 0 1 1 0 8 0 ucredpl 96 7568 0 7560 1 0 1 1 0 8 0 zombiepl 144 5542 0 5542 1 0 1 1 0 8 1 processpl 864 5573 0 5542 4 0 4 4 0 8 0 procpl 632 12416 0 12375 7 3 4 5 0 8 0 sosppl 128 117 0 117 25 24 1 1 0 8 1 sockpl 384 18352 0 18328 82 78 4 14 0 8 0 mcl64k 65536 1166 0 1166 88 69 19 65 0 8 19 mcl16k 16384 97 0 97 26 25 1 1 0 8 1 mcl12k 12288 201 0 201 17 17 0 1 0 8 0 mcl9k 9216 82 0 82 28 27 1 1 0 8 1 mcl8k 8192 367 0 367 12 12 0 1 0 8 0 mcl4k 4096 772 0 772 12 11 1 1 0 8 1 mcl2k2 2112 65 0 65 28 28 0 1 0 8 0 mcl2k 2048 82951 0 82907 24 17 7 13 0 8 1 mtagpl 80 317 0 317 7 6 1 2 0 8 1 mbufpl 256 201770 0 201643 346 329 17 45 0 8 4 bufpl 256 27307 0 19688 477 0 477 477 0 8 0 anonpl 16 733659 0 714997 296 198 98 142 0 62 0 amapchunkpl 152 32963 0 32800 158 150 8 41 0 158 0 amappl16 192 33038 0 31726 263 196 67 78 0 8 0 amappl15 184 1126 0 1123 4 3 1 1 0 8 0 amappl14 176 1146 0 1140 1 0 1 1 0 8 0 amappl13 168 392 0 390 1 0 1 1 0 8 0 amappl12 160 302 0 300 1 0 1 1 0 8 0 amappl11 152 591 0 580 1 0 1 1 0 8 0 amappl10 144 973 0 971 4 3 1 1 0 8 0 amappl9 136 1789 0 1786 1 0 1 1 0 8 0 amappl8 128 1350 0 1292 2 0 2 2 0 8 0 amappl7 120 1176 0 1167 1 0 1 1 0 8 0 amappl6 112 501 0 483 1 0 1 1 0 8 0 amappl5 104 816 0 806 1 0 1 1 0 8 0 amappl4 96 5829 0 5795 1 0 1 1 0 8 0 amappl3 88 1390 0 1379 1 0 1 1 0 8 0 amappl2 80 42052 0 41971 3 1 2 3 0 8 0 amappl1 72 114741 0 114306 26 16 10 20 0 8 0 amappl 80 13341 0 13279 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 18 0 17 1 0 1 1 0 8 0 aobjpl 64 135 0 6 3 0 3 3 0 8 0 uaddrrnd 24 5612 0 5538 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5612 0 5538 1 0 1 1 0 8 0 vmmpekpl 168 37632 0 37599 2 0 2 2 0 8 0 vmmpepl 168 697980 0 695320 535 372 163 171 0 357 41 vmsppl 272 5552 0 5538 9 8 1 2 0 8 0 pdppl 4096 11230 0 11164 13 4 9 9 0 8 0 pvpl 32 1876066 0 1855384 701 490 211 408 0 265 0 pmappl 200 5611 0 5567 3 0 3 3 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 1200 0 558 21 1 20 21 0 8 0