panic: kernel diagnostic assertion "rt->rt_ifa->ifa_ifp != NULL" failed: file "panic: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_fork.c", line 690 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 287033 63720 0 0 0x4000000 0 syz-executor.1 * 55440 48510 0 0 0x4000000 1 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(ffffffff82207051,ffffffff821f613e,2b2,ffffffff821d67e2) at __assert+0x2b sys/kern/subr_prf.c:154 proc_trampoline_mp() at proc_trampoline_mp+0x123 end trace frame: 0x0, count: 11 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic kernel diagnostic assertion "rt->rt_ifa->ifa_ifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/route.c", line 848 ddb{1}> 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(ffffffff82207051,ffffffff821f613e,2b2,ffffffff821d67e2) at __assert+0x2b sys/kern/subr_prf.c:154 proc_trampoline_mp() at proc_trampoline_mp+0x123 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800023dc7410 rbx 0xffff800023dc74c0 rdx 0xffff800020ab0c70 rcx 0 rax 0 r8 0xffffffff812be63f kprintf+0x16f r9 0x1 r10 0x25 r11 0xcfbc58d6946af996 r12 0x3000000008 r13 0xffff800023dc7420 r14 0x104 r15 0x1 rip 0xffffffff8101a1f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023dc7400 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=55440 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab1b40,0xffff800020a5f8c8 process=0xffff800020a8b890 user=0xffff800023dc2000, vmspace=0xfffffd807f00bcf0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 63720 521120 21965 0 2 0 syz-executor.1 63720 287033 21965 0 7 0x4000000 syz-executor.1 48510 105778 77895 0 2 0 syz-executor.0 48510 304893 77895 0 3 0x4000080 netcon2 syz-executor.0 *48510 55440 77895 0 7 0x4000000 syz-executor.0 48510 284609 77895 0 2 0x4000000 syz-executor.0 77895 477433 6353 0 3 0x82 nanosleep syz-executor.0 21965 422675 6353 0 3 0x82 nanosleep syz-executor.1 12213 75583 0 0 3 0x14200 acct acct 43731 131331 0 0 3 0x14200 bored sosplice 6353 131128 43992 0 3 0x82 thrsleep syz-fuzzer 6353 53565 43992 0 3 0x4000082 thrsleep syz-fuzzer 6353 203083 43992 0 3 0x4000082 thrsleep syz-fuzzer 6353 463526 43992 0 3 0x4000082 thrsleep syz-fuzzer 6353 5009 43992 0 3 0x4000082 thrsleep syz-fuzzer 6353 206143 43992 0 3 0x4000082 kqread syz-fuzzer 6353 321407 43992 0 3 0x4000082 thrsleep syz-fuzzer 6353 263311 43992 0 3 0x4000082 thrsleep syz-fuzzer 6353 56715 43992 0 3 0x4000082 thrsleep syz-fuzzer 6353 495158 43992 0 3 0x4000082 thrsleep syz-fuzzer 43992 484008 52843 0 3 0x10008a pause ksh 52843 399006 87315 0 3 0x92 select sshd 85201 331168 1 0 3 0x100083 ttyin getty 87315 330194 1 0 3 0x80 select sshd 97832 288650 79538 74 3 0x100092 bpf pflogd 79538 406374 1 0 3 0x80 netio pflogd 51605 246852 49550 73 3 0x100090 kqread syslogd 49550 488146 1 0 3 0x100082 netio syslogd 85436 407219 1 77 3 0x100090 poll dhclient 23603 515452 1 0 3 0x80 poll dhclient 49644 456463 0 0 2 0x14200 zerothread 78837 17747 0 0 3 0x14200 aiodoned aiodoned 2550 239365 0 0 3 0x14200 syncer update 35800 70166 0 0 3 0x14200 cleaner cleaner 58254 149780 0 0 3 0x14200 reaper reaper 64284 130433 0 0 3 0x14200 pgdaemon pagedaemon 39027 32759 0 0 3 0x14200 bored crynlk 32433 164739 0 0 3 0x14200 bored crypto 12224 33641 0 0 3 0x40014200 acpi0 acpi0 84394 355316 0 0 3 0x40014200 idle1 29314 267574 0 0 3 0x14200 bored softnet 89522 141831 0 0 3 0x14200 bored systqmp 81106 265780 0 0 3 0x14200 bored systq 78044 160465 0 0 3 0x40014200 bored softclock 65652 185248 0 0 3 0x40014200 idle0 7376 368840 0 0 3 0x14200 bored smr 1 473745 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 63720 (syz-executor.1) thread 0xffff800020ab1b40 (287033) exclusive rwlock netlock r = 0 (0xffffffff824b9ff8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sys_connect+0x6b sys/kern/uipc_syscalls.c:362 #3 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #3 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #4 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff82646968) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9594 6453K 7965K 78643K 15474 0 0 pcb 13 10K 12K 78643K 465 0 0 rtable 113 13K 15K 78643K 1554 0 0 ifaddr 86 18K 18K 78643K 464 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1563 0 0 iov 0 0K 24K 78643K 365 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1227 77K 78K 78643K 3364 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 156 0 0 VM map 9 4K 5K 78643K 21 0 0 sem 12 0K 0K 78643K 481 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 25K 78643K 2261 0 0 sigio 0 0K 0K 78643K 30 0 0 proc 62 63K 95K 78643K 1135 0 0 subproc 32 2K 2K 78643K 255 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 192 0 0 in_multi 30 2K 2K 78643K 298 0 0 ether_multi 1 0K 0K 78643K 31 0 0 mrt 0 0K 0K 78643K 14 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 150 662K 662K 78643K 150 0 0 exec 0 0K 1K 78643K 568 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 134 72K 72K 78643K 9423 0 0 UVM aobj 130 4K 4K 78643K 132 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 508 0 0 NDP 21 0K 0K 78643K 141 0 0 temp 228 3557K 3644K 78643K 79822 0 0 kqueue 0 0K 0K 78643K 10 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 56 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 112 281 0 242 2 0 2 2 0 8 0 unpcb 120 1113 0 1102 2 1 1 2 0 8 0 syncache 264 20 0 20 6 6 0 1 0 8 0 tcpqe 32 48 0 48 5 5 0 1 0 8 0 tcpcb 544 1405 0 1396 2 1 1 2 0 8 0 inpcb 280 3424 0 3412 26 24 2 13 0 8 1 rttmr 72 5 0 4 2 1 1 1 0 8 0 nd6 48 36 0 33 2 1 1 1 0 8 0 pkpcb 40 9 0 9 4 4 0 1 0 8 0 ppxss 1128 58 0 58 13 12 1 1 0 8 1 pffrag 232 71 0 69 11 10 1 1 0 482 0 pffrnode 88 70 0 69 11 10 1 1 0 8 0 pffrent 40 2404 0 2372 10 9 1 1 0 8 0 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 24 197 0 164 1 0 1 1 0 8 0 pfstkey 112 197 0 164 2 0 2 2 0 8 0 pfstate 328 197 0 164 5 0 5 5 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 15 0 14 7 6 1 3 0 8 0 art_heap4 256 1177 0 953 25 9 16 16 0 8 1 art_table 32 1192 0 967 4 1 3 3 0 8 0 art_node 16 279 0 243 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 7 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 477 0 467 1 0 1 1 0 8 0 shmpl 112 130 0 2 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 5000 0 3599 46 0 46 46 0 8 0 ffsino 272 5000 0 3599 94 0 94 94 0 8 0 nchpl 144 9762 0 9276 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 34753 0 34753 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 7 0 0 1 0 1 1 0 8 0 vmpool 552 19 0 12 1 0 1 1 0 8 0 scsiplug 64 3 0 3 3 3 0 1 0 8 0 scxspl 192 25478 0 25478 24 23 1 7 0 8 1 plimitpl 152 189 0 181 1 0 1 1 0 8 0 sigapl 432 2422 0 2406 3 1 2 3 0 8 0 futexpl 56 53773 0 53773 1 0 1 1 0 8 1 knotepl 112 612 0 593 3 2 1 2 0 8 0 kqueuepl 104 549 0 547 2 1 1 2 0 8 0 pipepl 112 1344 0 1325 5 4 1 2 0 8 0 fdescpl 488 2423 0 2406 3 0 3 3 0 8 0 filepl 152 24383 0 24280 28 23 5 14 0 8 0 lockfpl 104 626 0 625 1 0 1 1 0 8 0 lockfspl 48 224 0 223 1 0 1 1 0 8 0 sessionpl 112 31 0 20 1 0 1 1 0 8 0 pgrppl 48 49 0 38 1 0 1 1 0 8 0 ucredpl 96 6881 0 6872 1 0 1 1 0 8 0 zombiepl 144 2406 0 2406 1 0 1 1 0 8 1 processpl 896 2440 0 2406 4 0 4 4 0 8 0 procpl 632 7967 0 7920 6 1 5 5 0 8 1 srpgc 64 21 0 21 8 8 0 1 0 8 0 sosppl 128 44 0 43 8 7 1 1 0 8 0 sockpl 384 4758 0 4733 34 30 4 21 0 8 1 mcl64k 65536 266 0 0 34 14 20 34 0 8 1 mcl16k 16384 17 0 0 3 0 3 3 0 8 1 mcl12k 12288 18 0 0 2 0 2 2 0 8 0 mcl9k 9216 11 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 172 0 0 21 1 20 21 0 8 0 mtagpl 80 44 0 0 1 0 1 1 0 8 0 mbufpl 256 956 0 0 49 1 48 48 0 8 0 bufpl 256 12296 0 5248 441 0 441 441 0 8 0 anonpl 16 289797 0 270851 177 99 78 93 0 124 0 amapchunkpl 152 18184 0 18067 46 40 6 13 0 158 0 amappl16 192 13309 0 12231 147 91 56 67 0 8 0 amappl15 184 80 0 77 1 0 1 1 0 8 0 amappl14 176 559 0 555 1 0 1 1 0 8 0 amappl13 168 455 0 455 3 3 0 1 0 8 0 amappl12 160 212 0 208 2 1 1 1 0 8 0 amappl11 152 266 0 250 1 0 1 1 0 8 0 amappl10 144 701 0 695 1 0 1 1 0 8 0 amappl9 136 804 0 798 1 0 1 1 0 8 0 amappl8 128 366 0 322 2 0 2 2 0 8 0 amappl7 120 794 0 785 1 0 1 1 0 8 0 amappl6 112 259 0 250 1 0 1 1 0 8 0 amappl5 104 472 0 456 1 0 1 1 0 8 0 amappl4 96 2442 0 2407 1 0 1 1 0 8 0 amappl3 88 1324 0 1317 1 0 1 1 0 8 0 amappl2 80 17949 0 17866 3 1 2 3 0 8 0 amappl1 72 64399 0 63939 25 15 10 20 0 8 0 amappl 80 8467 0 8421 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 64 131 0 2 3 0 3 3 0 8 0 uaddrrnd 24 2442 0 2406 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2442 0 2406 1 0 1 1 0 8 0 vmmpekpl 168 24662 0 24625 3 1 2 2 0 8 0 vmmpepl 168 316046 0 313673 320 193 127 144 0 357 21 vmsppl 368 2422 0 2406 2 0 2 2 0 8 0 pdppl 4096 4891 0 4843 8 1 7 7 0 8 0 pvpl 32 800855 0 779106 350 168 182 218 0 265 1 pmappl 232 2441 0 2418 3 1 2 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 700 0 36 20 0 20 20 0 8 0