kern.securelevel: 0 -> 1 creating runtime link editor directory cache. preserving editor files. starting network daemons: sshd. starting local daemons:. Fri Jul 31 19:00:05 PDT 2020 OpenBSD/amd64 (ci-openbsd-main-6.c.syzkaller.internal) (tty00) Warning: Permanently added '10.128.0.175' (ECDSA) to the list of known hosts. executing program login: panic: syn_cache_insert: cacheoverflow: impossible Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *284037 71596 0 0x14000 0x200 0 softnet db_enter() at db_enter+0x18 panic(ffffffff823e79fb) at panic+0x164 syn_cache_insert(fffffd805d5cbd70,ffff800000ac3100) at syn_cache_insert+0x944 syn_cache_add(ffff80001d677ef8,ffff80001d677ea8,fffffd805e0950c4,14,fffffd805da7bc88,fffffd805e095000) at syn_cache_add+0x66b tcp_input(ffff80001d6781f8,ffff80001d678204,6,2) at tcp_input+0x37f6 ip_deliver(ffff80001d6781f8,ffff80001d678204,6,2) at ip_deliver+0x2e3 ip_ours(ffff80001d6781f8,ffff80001d678204,8b,0) at ip_ours+0x4fe ip_input_if(ffff80001d6781f8,ffff80001d678204,4,0,ffff800000679000) at ip_input_if+0x571 ipv4_input(ffff800000679000,fffffd805e095000) at ipv4_input+0x48 if_input_local(ffff800000679000,fffffd805e095000,2) at if_input_local+0xf9 loinput(ffff800000679000,fffffd805e095000) at loinput+0x4d if_input_process(ffff800000679000,ffff80001d678338) at if_input_process+0xda ifiq_process(ffff8000006793c0) at ifiq_process+0x80 taskq_thread(ffff80000002b080) at taskq_thread+0x92 end trace frame: 0x0, count: 1 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 syn_cache_insert: cacheoverflow: impossible ddb> trace db_enter() at db_enter+0x18 panic(ffffffff823e79fb) at panic+0x164 syn_cache_insert(fffffd805d5cbd70,ffff800000ac3100) at syn_cache_insert+0x944 syn_cache_add(ffff80001d677ef8,ffff80001d677ea8,fffffd805e0950c4,14,fffffd805da7bc88,fffffd805e095000) at syn_cache_add+0x66b tcp_input(ffff80001d6781f8,ffff80001d678204,6,2) at tcp_input+0x37f6 ip_deliver(ffff80001d6781f8,ffff80001d678204,6,2) at ip_deliver+0x2e3 ip_ours(ffff80001d6781f8,ffff80001d678204,8b,0) at ip_ours+0x4fe ip_input_if(ffff80001d6781f8,ffff80001d678204,4,0,ffff800000679000) at ip_input_if+0x571 ipv4_input(ffff800000679000,fffffd805e095000) at ipv4_input+0x48 if_input_local(ffff800000679000,fffffd805e095000,2) at if_input_local+0xf9 loinput(ffff800000679000,fffffd805e095000) at loinput+0x4d if_input_process(ffff800000679000,ffff80001d678338) at if_input_process+0xda ifiq_process(ffff8000006793c0) at ifiq_process+0x80 taskq_thread(ffff80000002b080) at taskq_thread+0x92 end trace frame: 0x0, count: -14 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001d677a70 rbx 0xffff80001d677b20 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffff80001d677a30 r9 0xffffffff817fa6cf kprintf+0x15f r10 0x1 r11 0xa64ba111049bcef5 r12 0x3000000008 r13 0xffff80001d677a80 r14 0x100 r15 0x1 rip 0xffffffff81e60e68 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d677a60 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (softnet) pid=284037 stat=onproc flags process=14000 proc=200 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff80001d6519c0,0xffff80001d651280 process=0xffff8000fffff220 user=0xffff80001d673000, vmspace=0xffffffff82869550 estcpu=0, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 51302 177816 71026 0 3 0x82 netcon2 syz-executor4572 71026 5207 50297 0 3 0x10008a pause ksh 50297 463637 92652 0 2 0x12 sshd 97034 445587 1 0 3 0x100083 ttyin getty 92652 120059 1 0 3 0x80 select sshd 12494 301104 76427 73 3 0x100090 kqread syslogd 76427 478787 1 0 3 0x100082 netio syslogd 3259 219644 1 77 3 0x100090 poll dhclient 74344 81434 1 0 3 0x80 poll dhclient 46967 423925 0 0 3 0x14200 bored smr 99537 471374 0 0 2 0x14200 zerothread 7636 89143 0 0 3 0x14200 aiodoned aiodoned 6978 287485 0 0 3 0x14200 syncer update 1377 12407 0 0 3 0x14200 cleaner cleaner 93408 412848 0 0 3 0x14200 reaper reaper 56906 108407 0 0 3 0x14200 pgdaemon pagedaemon 63305 231778 0 0 3 0x14200 bored crynlk 28590 320756 0 0 3 0x14200 bored crypto 50521 326006 0 0 3 0x40014200 acpi0 acpi0 *71596 284037 0 0 7 0x14200 softnet 67496 495658 0 0 3 0x14200 bored systqmp 33744 68412 0 0 3 0x14200 bored systq 43043 120770 0 0 3 0x40014200 bored softclock 13767 425860 0 0 3 0x40014200 idle0 1 393318 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 devbuf 9438 6318K 6319K 78643K 10537 0 pcb 13 8K 8K 78643K 13 0 rtable 61 1K 2K 78643K 117 0 ifaddr 24 7K 7K 78643K 24 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 13 0 mount 1 1K 1K 78643K 1 0 vnodes 1182 74K 74K 78643K 1187 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 0K 0K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 195K 288K 78643K 12938 0 file desc 1 0K 0K 78643K 1 0 proc 47 38K 46K 78643K 278 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 19 95K 95K 78643K 19 0 exec 0 0K 1K 78643K 151 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 55 2K 3K 78643K 688 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 3 0K 0K 78643K 3 0 temp 18 3845K 3909K 78643K 1422 0 kqueue 2 2K 2K 78643K 2 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 2 0 0 1 0 1 1 0 8 0 rtpcb 80 15 0 13 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 120 27 0 19 1 0 1 1 0 8 0 syncache 264 6 0 5 2 1 1 1 0 8 0 tcpcb 544 10 0 5 1 0 1 1 0 8 0 inpcb 296 24 0 16 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1389 0 15 86 0 86 86 0 8 0 ffsino 240 1389 0 15 81 0 81 81 0 8 0 nchpl 144 1563 0 30 57 0 57 57 0 8 0 uvmvnodes 72 1398 0 0 26 0 26 26 0 8 0 vnodes 208 1398 0 0 74 0 74 74 0 8 0 namei 1024 3485 0 3485 1 0 1 1 0 8 1 scxspl 192 3175 0 3175 1 0 1 1 0 8 1 plimitpl 152 13 0 8 1 0 1 1 0 8 0 sigapl 424 191 0 166 4 0 4 4 0 8 0 knotepl 112 5 0 0 1 0 1 1 0 8 0 kqueuepl 144 1 0 0 1 0 1 1 0 8 0 pipepl 272 57 0 53 1 0 1 1 0 8 0 fdescpl 432 177 0 166 2 0 2 2 0 8 0 filepl 120 824 0 779 2 0 2 2 0 8 0 lockfpl 104 5 0 4 1 0 1 1 0 8 0 lockfspl 48 3 0 2 1 0 1 1 0 8 0 sessionpl 112 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 96 57 0 50 1 0 1 1 0 8 0 zombiepl 144 166 0 166 1 0 1 1 0 8 1 processpl 928 191 0 166 4 0 4 4 0 8 0 procpl 624 191 0 166 3 0 3 3 0 8 0 sockpl 400 66 0 48 2 0 2 2 0 8 0 mcl4k 4096 10 0 10 2 1 1 1 0 8 1 mcl2k 2048 5269 0 5239 7 1 6 7 0 8 1 mtagpl 96 2 0 2 1 1 0 1 0 8 0 mbufpl 256 9149 0 9103 6 2 4 5 0 8 0 bufpl 280 1801 0 72 124 0 124 124 0 8 0 anonpl 16 17300 0 16176 7 2 5 7 0 107 0 amapchunkpl 152 474 0 438 2 0 2 2 0 158 0 amappl16 192 67 0 62 1 0 1 1 0 8 0 amappl15 184 2 0 1 1 0 1 1 0 8 0 amappl13 168 12 0 11 1 0 1 1 0 8 0 amappl12 160 21 0 19 1 0 1 1 0 8 0 amappl11 152 40 0 31 1 0 1 1 0 8 0 amappl10 144 5 0 3 1 0 1 1 0 8 0 amappl9 136 175 0 174 1 0 1 1 0 8 0 amappl8 128 197 0 196 1 0 1 1 0 8 0 amappl7 120 76 0 69 1 0 1 1 0 8 0 amappl6 112 19 0 16 1 0 1 1 0 8 0 amappl5 104 177 0 168 1 0 1 1 0 8 0 amappl4 96 396 0 373 1 0 1 1 0 8 0 amappl3 88 119 0 111 1 0 1 1 0 8 0 amappl2 80 707 0 658 2 0 2 2 0 8 0 amappl1 72 12214 0 11830 16 8 8 16 0 8 0 amappl 80 354 0 335 1 0 1 1 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 177 0 166 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 177 0 166 1 0 1 1 0 8 0 vmmpekpl 168 5203 0 5185 1 0 1 1 0 8 0 vmmpepl 168 26200 0 25439 48 12 36 48 0 357 2 vmsppl 272 176 0 166 1 0 1 1 0 8 0 pdppl 4096 360 0 332 5 0 5 5 0 8 0 pvpl 32 70304 0 67556 27 1 26 26 0 265 1 pmappl 200 176 0 166 1 0 1 1 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 208 0 6 6 0 6 6 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 panic(ffffffff823e79fb) at panic+0x164 syn_cache_insert(fffffd805d5cbd70,ffff800000ac3100) at syn_cache_insert+0x944 syn_cache_add(ffff80001d677ef8,ffff80001d677ea8,fffffd805e0950c4,14,fffffd805da7bc88,fffffd805e095000) at syn_cache_add+0x66b tcp_input(ffff80001d6781f8,ffff80001d678204,6,2) at tcp_input+0x37f6 ip_deliver(ffff80001d6781f8,ffff80001d678204,6,2) at ip_deliver+0x2e3 ip_ours(ffff80001d6781f8,ffff80001d678204,8b,0) at ip_ours+0x4fe ip_input_if(ffff80001d6781f8,ffff80001d678204,4,0,ffff800000679000) at ip_input_if+0x571 ipv4_input(ffff800000679000,fffffd805e095000) at ipv4_input+0x48 if_input_local(ffff800000679000,fffffd805e095000,2) at if_input_local+0xf9 loinput(ffff800000679000,fffffd805e095000) at loinput+0x4d if_input_process(ffff800000679000,ffff80001d678338) at if_input_process+0xda ifiq_process(ffff8000006793c0) at ifiq_process+0x80 taskq_thread(ffff80000002b080) at taskq_thread+0x92 end trace frame: 0x0, count: -14 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 panic(ffffffff823e79fb) at panic+0x164 syn_cache_insert(fffffd805d5cbd70,ffff800000ac3100) at syn_cache_insert+0x944 syn_cache_add(ffff80001d677ef8,ffff80001d677ea8,fffffd805e0950c4,14,fffffd805da7bc88,fffffd805e095000) at syn_cache_add+0x66b tcp_input(ffff80001d6781f8,ffff80001d678204,6,2) at tcp_input+0x37f6 ip_deliver(ffff80001d6781f8,ffff80001d678204,6,2) at ip_deliver+0x2e3 ip_ours(ffff80001d6781f8,ffff80001d678204,8b,0) at ip_ours+0x4fe ip_input_if(ffff80001d6781f8,ffff80001d678204,4,0,ffff800000679000) at ip_input_if+0x571 ipv4_input(ffff800000679000,fffffd805e095000) at ipv4_input+0x48 if_input_local(ffff800000679000,fffffd805e095000,2) at if_input_local+0xf9 loinput(ffff800000679000,fffffd805e095000) at loinput+0x4d if_input_process(ffff800000679000,ffff80001d678338) at if_input_process+0xda ifiq_process(ffff8000006793c0) at ifiq_process+0x80 taskq_thread(ffff80000002b080) at taskq_thread+0x92 end trace frame: 0x0, count: -14 ddb>