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 *361187 51893 0 0 0x4000000 0 syz-executor.1 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(ffffffff821e7024,ffffffff821a0d68,3a0,ffffffff8216eb9c) at __assert+0x2b sys/kern/subr_prf.c:154 rtm_output(ffff800000ad9700,ffff800015110a40,ffff800015110998,1b,5) at rtm_output+0xba9 sys/net/rtsock.c:1109 route_output(fffffd803f02a600,fffffd802a7c1078,0,0) at route_output+0x609 sys/net/rtsock.c:819 route_usrreq(fffffd802a7c1078,9,fffffd803f02a600,0,0,ffff8000ffff38c8) at route_usrreq+0x363 sys/net/rtsock.c:275 sosend(fffffd802a7c1078,0,ffff800015110c20,0,0,80) at sosend+0x63d sys/kern/uipc_socket.c:524 sendit(ffff8000ffff38c8,3,ffff800015110d00,0,ffff800015110de0) at sendit+0x52b sys/kern/uipc_syscalls.c:662 sys_sendto(ffff8000ffff38c8,ffff800015110d98,ffff800015110de0) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:527 syscall(ffff800015110e60) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3c894c6a310, 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(ffffffff821e7024,ffffffff821a0d68,3a0,ffffffff8216eb9c) at __assert+0x2b sys/kern/subr_prf.c:154 rtm_output(ffff800000ad9700,ffff800015110a40,ffff800015110998,1b,5) at rtm_output+0xba9 sys/net/rtsock.c:1109 route_output(fffffd803f02a600,fffffd802a7c1078,0,0) at route_output+0x609 sys/net/rtsock.c:819 route_usrreq(fffffd802a7c1078,9,fffffd803f02a600,0,0,ffff8000ffff38c8) at route_usrreq+0x363 sys/net/rtsock.c:275 sosend(fffffd802a7c1078,0,ffff800015110c20,0,0,80) at sosend+0x63d sys/kern/uipc_socket.c:524 sendit(ffff8000ffff38c8,3,ffff800015110d00,0,ffff800015110de0) at sendit+0x52b sys/kern/uipc_syscalls.c:662 sys_sendto(ffff8000ffff38c8,ffff800015110d98,ffff800015110de0) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:527 syscall(ffff800015110e60) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3c894c6a310, count: -11 ddb> show registers rdi 0xffffffff820e6c27 db_enter+0x17 rsi 0x3dea __ALIGN_SIZE+0x2dea rbp 0xffff800015110810 rbx 0xffff8000151108c0 rdx 0x3deb __ALIGN_SIZE+0x2deb rcx 0xffff800015b68000 rax 0xffff800015b68000 r8 0xffff8000151107d0 r9 0x1 r10 0xffff800000a47cc0 r11 0x5e2755695ea0323e r12 0x3000000008 r13 0xffff800015110820 r14 0x100 r15 0x1 rip 0xffffffff820e6c28 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800015110800 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=361187 stat=onproc flags process=0 proc=4000000 pri=81, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff2018,0xffffffff82586810 process=0xffff8000ffff6010 user=0xffff80001510b000, vmspace=0xfffffd803f011550 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 51893 492693 12589 0 2 0 syz-executor.1 *51893 361187 12589 0 7 0x4000000 syz-executor.1 12589 312699 88043 0 3 0x82 nanosleep syz-executor.1 69715 159321 0 0 3 0x14200 acct acct 56707 44779 1 0 3 0x100083 ttyin getty 85803 372145 0 0 3 0x14200 bored sosplice 88043 108405 71719 0 3 0x82 thrsleep syz-fuzzer 88043 18083 71719 0 2 0x4000482 syz-fuzzer 88043 284236 71719 0 2 0x4000002 syz-fuzzer 88043 393814 71719 0 3 0x4000082 thrsleep syz-fuzzer 88043 456610 71719 0 3 0x4000082 thrsleep syz-fuzzer 88043 79441 71719 0 3 0x4000082 thrsleep syz-fuzzer 88043 107988 71719 0 3 0x4000082 thrsleep syz-fuzzer 88043 507676 71719 0 3 0x4000082 thrsleep syz-fuzzer 88043 270538 71719 0 3 0x4000082 thrsleep syz-fuzzer 71719 184474 950 0 3 0x10008a pause ksh 950 418248 79634 0 3 0x92 select sshd 79634 65592 1 0 3 0x80 select sshd 42137 227243 31598 73 3 0x100090 kqread syslogd 31598 44357 1 0 3 0x100082 netio syslogd 79152 74339 0 0 2 0x14200 zerothread 72138 322114 0 0 3 0x14200 aiodoned aiodoned 79260 219905 0 0 3 0x14200 syncer update 95114 18548 0 0 3 0x14200 cleaner cleaner 16361 270721 0 0 3 0x14200 reaper reaper 56346 496843 0 0 3 0x14200 pgdaemon pagedaemon 47015 237526 0 0 3 0x14200 bored crynlk 74879 240131 0 0 3 0x14200 bored crypto 95884 282734 0 0 3 0x40014200 acpi0 acpi0 90584 95857 0 0 3 0x14200 bored softnet 55564 180023 0 0 3 0x14200 bored systqmp 15413 265732 0 0 3 0x14200 bored systq 8232 362208 0 0 3 0x40014200 bored softclock 21418 444692 0 0 3 0x40014200 idle0 93825 59734 0 0 3 0x14200 bored smr 1 460384 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 9562 6320K 7145K 78643K 18128 0 0 pcb 13 11K 12K 78643K 671 0 0 rtable 94 12K 14K 78643K 1752 0 0 ifaddr 208 25K 26K 78643K 720 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 0 0K 2K 78643K 216 0 0 iov 0 0K 24K 78643K 1311 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1222 77K 77K 78643K 3576 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 9K 78643K 28 0 0 VM map 21 5K 5K 78643K 28 0 0 sem 12 0K 1K 78643K 515 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1794 195K 288K 78643K 12646 0 0 file desc 4 9K 25K 78643K 2737 0 0 sigio 0 0K 0K 78643K 111 0 0 proc 44 30K 63K 78643K 1459 0 0 subproc 16 1K 2K 78643K 412 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 265 0 0 in_multi 84 4K 5K 78643K 471 0 0 ether_multi 1 0K 0K 78643K 22 0 0 mrt 1 0K 0K 78643K 23 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 72 318K 318K 78643K 72 0 0 exec 0 0K 1K 78643K 706 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 160 178K 190K 78643K 8131 0 0 UVM aobj 130 8K 8K 78643K 134 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 605 0 0 NDP 21 0K 1K 78643K 179 0 0 temp 153 3534K 3607K 78643K 139918 0 0 kqueue 0 0K 0K 78643K 38 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 78 0 73 1 0 1 1 0 8 0 rtpcb 80 1468 0 1467 1 0 1 1 0 8 0 rtentry 112 420 0 391 2 0 2 2 0 8 0 unpcb 120 1670 0 1662 2 1 1 2 0 8 0 syncache 264 15 0 15 6 6 0 1 0 8 0 tcpqe 32 59 0 59 5 5 0 1 0 8 0 tcpcb 544 2607 0 2603 32 31 1 14 0 8 0 ipq 40 28 0 28 7 6 1 1 0 8 1 ipqe 40 704 0 704 7 6 1 1 0 8 1 inpcb 280 5945 0 5941 23 21 2 9 0 8 1 rttmr 72 10 0 9 1 0 1 1 0 8 0 nd6 48 59 0 59 3 2 1 1 0 8 1 pkpcb 40 14 0 14 4 4 0 1 0 8 0 ppxss 1128 60 0 60 10 9 1 1 0 8 1 art_heap8 4096 9 0 8 5 4 1 3 0 8 0 art_heap4 256 1914 0 1722 36 19 17 21 0 8 3 art_table 32 1923 0 1730 6 3 3 3 0 8 0 art_node 16 415 0 388 1 0 1 1 0 8 0 sysvmsgpl 40 38 0 32 1 0 1 1 0 8 0 semapl 112 513 0 503 1 0 1 1 0 8 0 shmpl 112 132 0 4 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 5557 0 4152 46 0 46 46 0 8 0 ffsino 240 5557 0 4152 84 1 83 84 0 8 0 nchpl 144 9634 0 9180 60 40 20 60 0 8 0 uvmvnodes 72 7360 0 0 134 0 134 134 0 8 0 vnodes 208 7360 0 0 388 0 388 388 0 8 0 namei 1024 34836 0 34836 4 3 1 1 0 8 1 vcpupl 1984 19 0 0 3 0 3 3 0 8 0 vmpool 520 26 0 7 2 0 2 2 0 8 0 scxspl 192 43861 0 43861 22 20 2 7 0 8 2 plimitpl 152 235 0 230 1 0 1 1 0 8 0 sigapl 432 2842 0 2832 2 0 2 2 0 8 0 futexpl 56 80293 0 80293 5 4 1 1 0 8 1 knotepl 112 1166 0 1149 1 0 1 1 0 8 0 kqueuepl 104 1966 0 1964 7 6 1 4 0 8 0 pipepl 128 2218 0 2203 9 7 2 2 0 8 1 fdescpl 424 2843 0 2832 2 0 2 2 0 8 0 filepl 120 28934 0 28867 25 20 5 11 0 8 2 lockfpl 104 1644 0 1644 1 0 1 1 0 8 1 lockfspl 48 536 0 536 1 0 1 1 0 8 1 sessionpl 112 40 0 33 1 0 1 1 0 8 0 pgrppl 48 210 0 203 1 0 1 1 0 8 0 ucredpl 96 2695 0 2689 1 0 1 1 0 8 0 zombiepl 144 2832 0 2832 1 0 1 1 0 8 1 processpl 864 2859 0 2832 4 0 4 4 0 8 0 procpl 632 6038 0 6002 4 0 4 4 0 8 0 sosppl 128 50 0 50 12 11 1 1 0 8 1 sockpl 384 9183 0 9170 48 44 4 14 0 8 1 mcl64k 65536 1399 0 1399 95 94 1 65 0 8 1 mcl16k 16384 75 0 75 10 9 1 1 0 8 1 mcl12k 12288 284 0 284 4 3 1 1 0 8 1 mcl9k 9216 43 0 43 9 8 1 1 0 8 1 mcl8k 8192 232 0 232 6 5 1 1 0 8 1 mcl4k 4096 314 0 314 6 5 1 1 0 8 1 mcl2k2 2112 20 0 20 13 13 0 1 0 8 0 mcl2k 2048 81762 0 81726 17 11 6 11 0 8 0 mtagpl 80 153 0 153 5 4 1 1 0 8 1 mbufpl 256 166814 0 166764 159 145 14 55 0 8 8 bufpl 256 19158 0 11385 487 0 487 487 0 8 0 anonpl 16 439325 0 418244 212 115 97 136 0 62 4 amapchunkpl 152 18227 0 18077 87 77 10 36 0 158 2 amappl16 192 17371 0 16164 195 125 70 84 0 8 8 amappl15 184 1571 0 1570 1 0 1 1 0 8 0 amappl14 176 427 0 422 1 0 1 1 0 8 0 amappl13 168 255 0 255 4 4 0 1 0 8 0 amappl12 160 50 0 49 3 2 1 1 0 8 0 amappl11 152 351 0 347 1 0 1 1 0 8 0 amappl10 144 254 0 248 1 0 1 1 0 8 0 amappl9 136 1284 0 1280 1 0 1 1 0 8 0 amappl8 128 876 0 807 3 0 3 3 0 8 0 amappl7 120 375 0 366 1 0 1 1 0 8 0 amappl6 112 324 0 305 1 0 1 1 0 8 0 amappl5 104 791 0 785 1 0 1 1 0 8 0 amappl4 96 2947 0 2918 1 0 1 1 0 8 0 amappl3 88 946 0 939 1 0 1 1 0 8 0 amappl2 80 21535 0 21473 3 1 2 3 0 8 0 amappl1 72 63547 0 63165 26 17 9 20 0 8 0 amappl 80 6652 0 6603 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 64 133 0 4 3 0 3 3 0 8 0 uaddrrnd 24 2869 0 2832 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2869 0 2832 1 0 1 1 0 8 0 vmmpekpl 168 23135 0 23102 2 0 2 2 0 8 0 vmmpepl 168 366468 0 364222 306 156 150 152 0 357 40 vmsppl 272 2842 0 2832 5 4 1 2 0 8 0 pdppl 4096 5744 0 5697 10 3 7 7 0 8 0 pvpl 32 1149207 0 1125375 508 249 259 405 0 265 50 pmappl 200 2868 0 2839 3 1 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 961 0 336 21 1 20 20 0 8 0