panic: Data modified on freelist: word 5 of object 0xffff800000a8bd00 size 0xc0 previous type devbuf (0xd != 0xdeaf4152) Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 39811 37138 0 0 0 0 dhclient db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 malloc(c0,5,9) at malloc+0xa23 sys/kern/kern_malloc.c:331 rtm_report(fffffd8036d71070,4,d886e631,0) at rtm_report+0x2d9 sys/net/rtsock.c:654 route_output(fffffd802f594d00,fffffd803a01b180,0,0) at route_output+0x6b7 sys/net/rtsock.c:824 route_usrreq(fffffd803a01b180,9,fffffd802f594d00,0,0,ffff8000ffff8ed8) at route_usrreq+0x363 sys/net/rtsock.c:275 sosend(fffffd803a01b180,0,ffff800014886440,0,0,0) at sosend+0x63d sys/kern/uipc_socket.c:524 dofilewritev(ffff8000ffff8ed8,6,ffff800014886440,0,ffff800014886530) at dofilewritev+0x1ac sys/kern/sys_generic.c:364 sys_writev(ffff8000ffff8ed8,ffff8000148864e0,ffff800014886530) at sys_writev+0xa7 sys/kern/sys_generic.c:311 syscall(ffff8000148865b0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,79,0,79,d886e631,77ed60ba000) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffdaef0, 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 Data modified on freelist: word 5 of object 0xffff800000a8bd00 size 0xc0 previous type devbuf (0xd != 0xdeaf4152) 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 malloc(c0,5,9) at malloc+0xa23 sys/kern/kern_malloc.c:331 rtm_report(fffffd8036d71070,4,d886e631,0) at rtm_report+0x2d9 sys/net/rtsock.c:654 route_output(fffffd802f594d00,fffffd803a01b180,0,0) at route_output+0x6b7 sys/net/rtsock.c:824 route_usrreq(fffffd803a01b180,9,fffffd802f594d00,0,0,ffff8000ffff8ed8) at route_usrreq+0x363 sys/net/rtsock.c:275 sosend(fffffd803a01b180,0,ffff800014886440,0,0,0) at sosend+0x63d sys/kern/uipc_socket.c:524 dofilewritev(ffff8000ffff8ed8,6,ffff800014886440,0,ffff800014886530) at dofilewritev+0x1ac sys/kern/sys_generic.c:364 sys_writev(ffff8000ffff8ed8,ffff8000148864e0,ffff800014886530) at sys_writev+0xa7 sys/kern/sys_generic.c:311 syscall(ffff8000148865b0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,79,0,79,d886e631,77ed60ba000) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffdaef0, count: -11 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800014885d50 rbx 0xffff800014885e00 rdx 0x2 rcx 0 rax 0 r8 0xffff800014885d10 r9 0x1 r10 0 r11 0xc0495391444d3ba1 r12 0x3000000008 r13 0xffff800014885d60 r14 0x100 r15 0x1 rip 0xffffffff820d0728 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800014885d40 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (dhclient) pid=39811 stat=onproc flags process=0 proc=0 pri=50, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff8280,0xffff8000ffff93d8 process=0xffff8000ffff6d90 user=0xffff800014881000, vmspace=0xfffffd803f013000 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 41464 244764 98424 0 3 0x80 nanosleep syz-executor.1 41464 498126 98424 0 3 0x4000080 kqread syz-executor.1 41464 438878 98424 0 3 0x4000080 fsleep syz-executor.1 98424 61734 82163 0 3 0x82 nanosleep syz-executor.1 45786 135627 0 0 3 0x14200 bored sosplice 78259 5544 82163 0 3 0x82 nanosleep syz-executor.0 82163 202603 66700 0 3 0x82 thrsleep syz-fuzzer 82163 271375 66700 0 3 0x4000082 thrsleep syz-fuzzer 82163 339356 66700 0 3 0x4000082 kqread syz-fuzzer 82163 266355 66700 0 3 0x4000082 thrsleep syz-fuzzer 82163 16261 66700 0 3 0x4000082 thrsleep syz-fuzzer 82163 269192 66700 0 3 0x4000082 thrsleep syz-fuzzer 82163 427554 66700 0 3 0x4000082 thrsleep syz-fuzzer 82163 483811 66700 0 3 0x4000082 thrsleep syz-fuzzer 66700 216092 81294 0 3 0x10008a pause ksh 81294 13600 67671 0 3 0x92 select sshd 91131 183036 1 0 3 0x100083 ttyin getty 67671 489448 1 0 3 0x80 select sshd 11740 177326 91732 73 3 0x100090 kqread syslogd 91732 404402 1 0 3 0x100082 netio syslogd 48998 134819 1 77 2 0x100010 dhclient *37138 39811 1 0 7 0 dhclient 64871 438537 0 0 2 0x14200 zerothread 69314 183950 0 0 3 0x14200 aiodoned aiodoned 6069 170668 0 0 3 0x14200 syncer update 28694 150033 0 0 3 0x14200 cleaner cleaner 18176 344907 0 0 3 0x14200 reaper reaper 66716 87118 0 0 3 0x14200 pgdaemon pagedaemon 83111 168862 0 0 3 0x14200 bored crynlk 46055 112251 0 0 3 0x14200 bored crypto 68628 357077 0 0 3 0x40014200 acpi0 acpi0 5901 363800 0 0 2 0x14200 softnet 78990 87533 0 0 3 0x14200 bored systqmp 75668 86757 0 0 3 0x14200 bored systq 44110 271302 0 0 3 0x40014200 bored softclock 31914 151239 0 0 3 0x40014200 idle0 47852 146826 0 0 3 0x14200 bored smr 1 308989 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 9490 6390K 6974K 78643K 11011 0 0 pcb 13 8K 8K 78643K 54 0 0 rtable 91 7K 8K 78643K 316 0 0 ifaddr 48 11K 12K 78643K 76 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 0 0K 2K 78643K 21 0 0 iov 0 0K 16K 78643K 37 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1219 77K 77K 78643K 1414 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 0K 0K 78643K 2 0 0 sem 12 0K 1K 78643K 25 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1793 195K 288K 78643K 12645 0 0 file desc 6 17K 25K 78643K 188 0 0 sigio 0 0K 0K 78643K 4 0 0 proc 48 38K 63K 78643K 393 0 0 subproc 32 2K 2K 78643K 51 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 16 0 0 in_multi 22 1K 2K 78643K 45 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 48 212K 212K 78643K 48 0 0 exec 0 0K 1K 78643K 219 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 97 21K 22K 78643K 1386 0 0 UVM aobj 8 2K 2K 78643K 8 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 22 0 0 NDP 10 0K 0K 78643K 22 0 0 temp 154 3536K 3608K 78643K 3967 0 0 kqueue 0 0K 0K 78643K 2 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 11 0 7 1 0 1 1 0 8 0 rtpcb 80 28 0 26 1 0 1 1 0 8 0 rtentry 112 62 0 28 2 0 2 2 0 8 0 unpcb 120 102 0 94 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 3220 0 3220 1 1 0 1 0 8 0 tcpcb 544 68 0 64 2 1 1 2 0 8 0 inpcb 280 172 0 165 3 2 1 3 0 8 0 nd6 48 6 0 4 1 0 1 1 0 8 0 ppxss 1128 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 265 0 93 14 0 14 14 0 8 2 art_table 32 266 0 93 2 0 2 2 0 8 0 art_node 16 61 0 30 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 20 0 10 1 0 1 1 0 8 0 shmpl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1658 0 263 46 0 46 46 0 8 0 ffsino 240 1658 0 263 83 0 83 83 0 8 0 nchpl 144 2114 0 512 60 0 60 60 0 8 0 uvmvnodes 72 1854 0 0 34 0 34 34 0 8 0 vnodes 208 1854 0 0 98 0 98 98 0 8 0 namei 1024 5665 0 5665 3 2 1 1 0 8 1 scxspl 192 5826 0 5826 12 11 1 7 0 8 1 plimitpl 152 24 0 16 1 0 1 1 0 8 0 sigapl 432 356 0 342 2 0 2 2 0 8 0 futexpl 56 4115 0 4114 1 0 1 1 0 8 0 knotepl 112 180 0 160 1 0 1 1 0 8 0 kqueuepl 104 197 0 193 1 0 1 1 0 8 0 pipepl 112 212 0 191 3 2 1 2 0 8 0 fdescpl 424 357 0 342 2 0 2 2 0 8 0 filepl 120 2422 0 2318 5 1 4 5 0 8 0 lockfpl 104 41 0 40 1 0 1 1 0 8 0 lockfspl 48 17 0 16 1 0 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 18 0 8 1 0 1 1 0 8 0 ucredpl 96 268 0 261 1 0 1 1 0 8 0 zombiepl 144 343 0 342 3 2 1 1 0 8 0 processpl 864 372 0 342 4 0 4 4 0 8 0 procpl 632 648 0 609 5 1 4 5 0 8 0 sosppl 128 3 0 3 1 1 0 1 0 8 0 sockpl 384 306 0 289 6 3 3 6 0 8 1 mcl64k 65536 20 0 20 2 1 1 1 0 8 1 mcl12k 12288 9 0 9 1 0 1 1 0 8 1 mcl9k 9216 1 0 1 1 1 0 1 0 8 0 mcl8k 8192 5 0 5 2 1 1 1 0 8 1 mcl4k 4096 23 0 23 2 1 1 1 0 8 1 mcl2k2 2112 3 0 3 2 1 1 1 0 8 1 mcl2k 2048 64906 0 64863 15 9 6 13 0 8 0 mtagpl 80 8 0 4 3 2 1 1 0 8 0 mbufpl 256 105102 0 105029 14 6 8 10 0 8 1 bufpl 256 6420 0 1580 303 0 303 303 0 8 0 anonpl 16 58776 0 42604 83 9 74 80 0 62 9 amapchunkpl 152 2019 0 1907 10 5 5 8 0 158 0 amappl16 192 2057 0 1124 53 6 47 53 0 8 0 amappl14 176 102 0 97 2 1 1 1 0 8 0 amappl12 160 81 0 76 1 0 1 1 0 8 0 amappl11 152 51 0 40 1 0 1 1 0 8 0 amappl10 144 22 0 18 1 0 1 1 0 8 0 amappl9 136 585 0 579 1 0 1 1 0 8 0 amappl8 128 155 0 131 1 0 1 1 0 8 0 amappl7 120 39 0 35 1 0 1 1 0 8 0 amappl6 112 67 0 58 1 0 1 1 0 8 0 amappl5 104 228 0 215 1 0 1 1 0 8 0 amappl4 96 538 0 510 1 0 1 1 0 8 0 amappl3 88 157 0 151 1 0 1 1 0 8 0 amappl2 80 1965 0 1891 4 2 2 3 0 8 0 amappl1 72 16632 0 16217 28 19 9 20 0 8 0 amappl 80 903 0 864 2 1 1 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 7 0 0 1 0 1 1 0 8 0 uaddrrnd 24 357 0 342 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 357 0 342 1 0 1 1 0 8 0 vmmpekpl 168 6881 0 6857 2 0 2 2 0 8 0 vmmpepl 168 51046 0 48972 158 40 118 123 0 357 26 vmsppl 272 356 0 342 3 2 1 2 0 8 0 pdppl 4096 720 0 684 6 1 5 6 0 8 0 pvpl 32 177618 0 158374 199 17 182 188 0 265 26 pmappl 200 356 0 342 1 0 1 1 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 455 0 26 13 0 13 13 0 8 0