kern.securelevel: 0 -> 1 creating runtime link editor directory cache. preserving editor files. starting network daemons: sshd. starting local daemons:. Fri Apr 17 19:56:56 PDT 2020 OpenBSD/amd64 (ci-openbsd-multicore-9.c.syzkaller.internal) (tty00) Warning: Permanently added '10.128.0.235' (ECDSA) to the list of known hosts. 2020/04/17 19:57:05 parsed 1 programs 2020/04/17 19:57:11 executed programs: 0 login: panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806f2bcc00+16 0x0!=0x28aec20f4c98e409 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *288865 59266 0 0x12 0 1 sshd 308717 59117 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 panic(ffffffff821f69d1) at panic+0x15c pool_cache_get(ffffffff8266d8c8) at pool_cache_get+0x323 pool_get(ffffffff8266d8c8,2) at pool_get+0x91 m_copym(fffffd806f2bcb00,0,24,2) at m_copym+0x174 tcp_output(ffff800000a0b760) at tcp_output+0x15ba tcp_usrreq(fffffd806eb3b328,9,fffffd806f2bcb00,0,0,ffff800020ed0c40) at tcp_usrreq+0xa55 sosend(fffffd806eb3b328,0,ffff800020e8cee8,0,0,80) at sosend+0x671 dofilewritev(ffff800020ed0c40,4,ffff800020e8cee8,0,ffff800020e8cfd0) at dofilewritev+0x1b6 sys_write(ffff800020ed0c40,ffff800020e8cf80,ffff800020e8cfd0) at sys_write+0x83 syscall(ffff800020e8d050) at syscall+0x4a4 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff6d80, count: 3 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 pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806f2bcc00+16 0x0!=0x28aec20f4c98e409 ddb{1}> trace db_enter() at db_enter+0x18 panic(ffffffff821f69d1) at panic+0x15c pool_cache_get(ffffffff8266d8c8) at pool_cache_get+0x323 pool_get(ffffffff8266d8c8,2) at pool_get+0x91 m_copym(fffffd806f2bcb00,0,24,2) at m_copym+0x174 tcp_output(ffff800000a0b760) at tcp_output+0x15ba tcp_usrreq(fffffd806eb3b328,9,fffffd806f2bcb00,0,0,ffff800020ed0c40) at tcp_usrreq+0xa55 sosend(fffffd806eb3b328,0,ffff800020e8cee8,0,0,80) at sosend+0x671 dofilewritev(ffff800020ed0c40,4,ffff800020e8cee8,0,ffff800020e8cfd0) at dofilewritev+0x1b6 sys_write(ffff800020ed0c40,ffff800020e8cf80,ffff800020e8cfd0) at sys_write+0x83 syscall(ffff800020e8d050) at syscall+0x4a4 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff6d80, count: -12 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020e8c880 rbx 0xffff800020e8c930 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff81ce227f kprintf+0x16f r9 0x1 r10 0x1bb91851e248c862 r11 0x5a014ccc5be69343 r12 0x3000000008 r13 0xffff800020e8c890 r14 0x100 r15 0x1 rip 0xffffffff8166ea08 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020e8c870 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (sshd) pid=288865 stat=onproc flags process=12 proc=0 pri=24, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020ed0760,0xffffffff82675f18 process=0xffff800020ec8ba0 user=0xffff800020e88000, vmspace=0xfffffd806e94e5c8 estcpu=1, cpticks=2, pctcpu=0.5 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *59266 288865 53662 0 7 0x12 sshd 40158 406735 1 0 3 0x100083 ttyin getty 53662 493628 1 0 3 0x80 select sshd 46249 446648 82945 74 3 0x100092 bpf pflogd 82945 106186 1 0 3 0x80 netio pflogd 78427 460123 17082 73 3 0x100090 kqread syslogd 17082 99301 1 0 3 0x100082 netio syslogd 96450 327462 1 77 3 0x100090 poll dhclient 85079 116770 1 0 3 0x80 poll dhclient 55426 421209 0 0 3 0x14200 bored smr 95540 129395 0 0 2 0x14200 zerothread 63203 55572 0 0 3 0x14200 aiodoned aiodoned 26371 172373 0 0 3 0x14200 syncer update 42139 53098 0 0 3 0x14200 cleaner cleaner 59117 308717 0 0 7 0x14200 reaper 9622 494207 0 0 3 0x14200 pgdaemon pagedaemon 19989 524036 0 0 3 0x14200 bored crynlk 51966 209951 0 0 3 0x14200 bored crypto 87984 64683 0 0 3 0x40014200 acpi0 acpi0 97226 340682 0 0 3 0x40014200 idle1 42275 262860 0 0 3 0x14200 bored softnet 69912 495799 0 0 3 0x14200 bored systqmp 93814 261263 0 0 3 0x14200 bored systq 77198 413833 0 0 3 0x40014200 bored softclock 61606 19033 0 0 3 0x40014200 idle0 1 505117 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: kernel: protection fault trap, code=0 Faulted in DDB; continuing... ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9462 6393K 6395K 78643K 10557 0 pcb 13 8K 8K 78643K 13 0 rtable 61 2K 2K 78643K 167 0 ifaddr 29 8K 9K 78643K 39 0 counters 39 33K 33K 78643K 41 0 ioctlops 0 0K 4K 78643K 1468 0 mount 1 1K 1K 78643K 1 0 vnodes 1183 74K 75K 78643K 1188 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 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 1 0K 12K 78643K 18 0 proc 59 63K 83K 78643K 398 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 1K 78643K 22 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 197 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 54 2K 12K 78643K 949 0 UVM aobj 2 2K 2K 78643K 2 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 4 0K 0K 78643K 7 0 temp 24 3033K 3097K 78643K 1927 0 kqueue 2 2K 4K 78643K 3 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 4 0 2 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 17 0 15 1 0 1 1 0 8 0 rtentry 112 34 0 12 1 0 1 1 0 8 0 unpcb 120 29 0 19 1 0 1 1 0 8 0 syncache 264 5 0 5 1 0 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 34 0 28 1 0 1 1 0 8 0 nd6 48 3 0 3 1 0 1 1 0 8 1 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 10 0 0 1 0 1 1 0 8 0 pfstkey 112 10 0 0 1 0 1 1 0 8 0 pfstate 328 10 0 0 1 0 1 1 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 144 0 48 9 0 9 9 0 8 3 art_table 32 145 0 48 2 0 2 2 0 8 1 art_node 16 33 0 13 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1423 0 25 88 0 88 88 0 8 0 ffsino 272 1423 0 25 94 0 94 94 0 8 0 nchpl 144 1651 0 57 60 0 60 60 0 8 0 uvmvnodes 72 1433 0 0 27 0 27 27 0 8 0 vnodes 208 1433 0 0 76 0 76 76 0 8 0 namei 1024 4180 0 4180 1 0 1 1 0 8 1 percpumem 16 31 0 1 1 0 1 1 0 8 0 scxspl 192 4514 0 4514 2 1 1 2 0 8 1 plimitpl 152 15 0 9 1 0 1 1 0 8 0 sigapl 424 241 0 215 4 0 4 4 0 8 0 knotepl 112 39 0 34 1 0 1 1 0 8 0 kqueuepl 144 2 0 1 1 0 1 1 0 8 0 pipelkpl 48 74 0 73 1 0 1 1 0 8 0 pipepl 120 148 0 146 1 0 1 1 0 8 0 fdescpl 496 226 0 215 3 0 3 3 0 8 0 filepl 152 1106 0 1063 3 0 3 3 0 8 1 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 19 0 10 1 0 1 1 0 8 0 pgrppl 48 19 0 10 1 0 1 1 0 8 0 ucredpl 96 62 0 53 1 0 1 1 0 8 0 zombiepl 144 215 0 214 1 0 1 1 0 8 0 processpl 984 241 0 214 5 0 5 5 0 8 1 procpl 624 249 0 222 4 0 4 4 0 8 1 sockpl 400 80 0 62 2 0 2 2 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 77 0 0 10 0 10 10 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 127 0 0 8 0 8 8 0 8 0 bufpl 280 3807 0 189 259 0 259 259 0 8 0 anonpl 16 22214 0 21058 14 1 13 13 0 124 7 amapchunkpl 152 753 0 717 5 0 5 5 0 158 3 amappl16 192 139 0 136 2 0 2 2 0 8 1 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 37 0 34 1 0 1 1 0 8 0 amappl13 168 20 0 20 1 0 1 1 0 8 1 amappl12 160 7 0 7 1 0 1 1 0 8 1 amappl11 152 52 0 37 1 0 1 1 0 8 0 amappl10 144 17 0 15 1 0 1 1 0 8 0 amappl9 136 237 0 236 1 0 1 1 0 8 0 amappl8 128 268 0 267 1 0 1 1 0 8 0 amappl7 120 118 0 110 1 0 1 1 0 8 0 amappl6 112 22 0 22 2 1 1 1 0 8 1 amappl5 104 124 0 111 1 0 1 1 0 8 0 amappl4 96 496 0 471 1 0 1 1 0 8 0 amappl3 88 110 0 104 1 0 1 1 0 8 0 amappl2 80 936 0 888 3 0 3 3 0 8 1 amappl1 72 15381 0 15003 25 7 18 20 0 8 8 amappl 80 475 0 456 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 226 0 215 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 226 0 215 1 0 1 1 0 8 0 vmmpekpl 168 6301 0 6281 2 0 2 2 0 8 0 vmmpepl 168 32643 0 31897 82 2 80 80 0 357 41 vmsppl 368 225 0 215 2 0 2 2 0 8 0 pdppl 4096 460 0 430 6 0 6 6 0 8 0 pvpl 32 112279 0 109488 115 0 115 115 0 265 87 pmappl 232 225 0 215 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 234 0 3 7 0 7 7 0 8 0 ddb{1}>