kern.securelevel: 0 -> 1 creating runtime link editor directory cache. preserving editor files. starting network daemons: sshd. starting local daemons:. Thu Jun 18 22:44:16 PDT 2020 OpenBSD/amd64 (ci-openbsd-multicore-3.c.syzkaller.internal) (tty00) Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. 2020/06/18 22:44:44 parsed 1 programs 2020/06/18 22:44:49 executed programs: 0 login: panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806d822500+16 0x0!=0xab7e1d93b78580d4 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *126096 95102 0 0x14000 0x40000200 0K softclock db_enter() at db_enter+0x18 panic(ffffffff823e5c7f) at panic+0x15c pool_cache_get(ffffffff829086d0) at pool_cache_get+0x323 pool_get(ffffffff829086d0,2) at pool_get+0x91 m_get(2,1) at m_get+0x4c ip6_output(fffffd806d822e00,ffffffff827bf1f8,0,1,ffff800020d978b8,0) at ip6_output+0x203 mld6_sendpkt(ffff800000aef080,83,0) at mld6_sendpkt+0x2da mld6_fasttimeo() at mld6_fasttimeo+0x162 pffasttimo(ffffffff827bd7c8) at pffasttimo+0x85 timeout_run(ffffffff827bd7c8) at timeout_run+0xc4 softclock_thread(ffff800020d89110) at softclock_thread+0x16a end trace frame: 0x0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806d822500+16 0x0!=0xab7e1d93b78580d4 ddb{0}> trace db_enter() at db_enter+0x18 panic(ffffffff823e5c7f) at panic+0x15c pool_cache_get(ffffffff829086d0) at pool_cache_get+0x323 pool_get(ffffffff829086d0,2) at pool_get+0x91 m_get(2,1) at m_get+0x4c ip6_output(fffffd806d822e00,ffffffff827bf1f8,0,1,ffff800020d978b8,0) at ip6_output+0x203 mld6_sendpkt(ffff800000aef080,83,0) at mld6_sendpkt+0x2da mld6_fasttimeo() at mld6_fasttimeo+0x162 pffasttimo(ffffffff827bd7c8) at pffasttimo+0x85 timeout_run(ffffffff827bd7c8) at timeout_run+0xc4 softclock_thread(ffff800020d89110) at softclock_thread+0x16a end trace frame: 0x0, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020d974f0 rbx 0xffff800020d975a0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff810d29cf kprintf+0x16f r9 0x1 r10 0x2 r11 0x7a88b5162664b913 r12 0x3000000008 r13 0xffff800020d97500 r14 0x100 r15 0x1 rip 0xffffffff81902818 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020d974e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (softclock) pid=126096 stat=onproc flags process=14000 proc=40000200 pri=0, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020d89380,0xffff800020d88eb0 process=0xffff800020d8a7b0 user=0xffff800020d92000, vmspace=0xffffffff828c06b0 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 51362 31384 17494 0 3 0x82 nanosleep syz-executor.0 17494 379106 81534 0 3 0x82 thrsleep syz-execprog 17494 311152 81534 0 3 0x4000082 nanosleep syz-execprog 17494 283448 81534 0 3 0x4000082 thrsleep syz-execprog 17494 141905 81534 0 3 0x4000082 kqread syz-execprog 17494 390663 81534 0 3 0x4000082 thrsleep syz-execprog 17494 173510 81534 0 3 0x4000082 thrsleep syz-execprog 17494 202959 81534 0 3 0x4000082 thrsleep syz-execprog 17494 105472 81534 0 3 0x4000082 thrsleep syz-execprog 17494 71015 81534 0 3 0x4000082 nanosleep syz-execprog 81534 390182 92663 0 3 0x10008a pause ksh 92663 10424 26421 0 3 0x92 select sshd 44149 150550 1 0 3 0x100083 ttyin getty 26421 75459 1 0 3 0x80 select sshd 51146 273266 24842 74 3 0x100092 bpf pflogd 24842 134518 1 0 3 0x80 netio pflogd 60887 273530 72453 73 3 0x100090 kqread syslogd 72453 204035 1 0 3 0x100082 netio syslogd 42667 1409 1 77 3 0x100090 poll dhclient 79506 115613 1 0 3 0x80 poll dhclient 32788 400653 0 0 3 0x14200 bored smr 19907 147501 0 0 3 0x14200 pgzero zerothread 97039 480750 0 0 3 0x14200 aiodoned aiodoned 92399 153318 0 0 3 0x14200 syncer update 41797 237007 0 0 3 0x14200 cleaner cleaner 91943 228184 0 0 3 0x14200 reaper reaper 68156 425016 0 0 3 0x14200 pgdaemon pagedaemon 93433 66578 0 0 3 0x14200 bored crynlk 63057 310824 0 0 3 0x14200 bored crypto 6984 91904 0 0 3 0x40014200 acpi0 acpi0 25236 260715 0 0 7 0x40014200 idle1 44734 158405 0 0 3 0x14200 bored softnet 90706 381347 0 0 3 0x14200 bored systqmp 32167 318182 0 0 3 0x14200 bored systq *95102 126096 0 0 7 0x40014200 softclock 55128 232943 0 0 3 0x40014200 idle0 1 334636 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 95102 (softclock) thread 0xffff800020d89110 (126096) exclusive rwlock netlock r = 0 (0xffffffff8272f108) #0 witness_lock+0x4c7 #1 mld6_fasttimeo+0x1d #2 pffasttimo+0x85 #3 timeout_run+0xc4 #4 softclock_thread+0x16a #5 proc_trampoline+0x1c shared rwlock timeout r = 0 (0xffffffff82796580) #0 witness_lock+0x4c7 #1 timeout_run+0xb9 #2 softclock_thread+0x16a #3 proc_trampoline+0x1c exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8290a550) #0 witness_lock+0x4c7 #1 __mp_acquire_count+0x51 #2 mi_switch+0x392 #3 sleep_finish+0x113 #4 softclock_thread+0x103 #5 proc_trampoline+0x1c ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9467 6396K 6396K 78643K 10560 0 pcb 13 8K 8K 78643K 13 0 rtable 83 2K 2K 78643K 163 0 ifaddr 37 9K 9K 78643K 46 0 counters 41 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 1824 197K 290K 78643K 13058 0 file desc 2 4K 12K 78643K 25 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 22 1K 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 74 12K 12K 78643K 953 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 7 0K 0K 78643K 7 0 temp 29 3841K 3905K 78643K 1881 0 kqueue 3 4K 4K 78643K 3 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 4 0 0 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 1 1 0 1 1 0 8 0 unpcb 120 29 0 19 1 0 1 1 0 8 0 syncache 264 5 0 5 2 1 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 41 0 35 1 0 1 1 0 8 0 nd6 48 3 0 0 1 0 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 11 0 0 1 0 1 1 0 8 0 pfstkey 112 11 0 0 1 0 1 1 0 8 0 pfstate 328 11 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 0 9 0 9 9 0 8 0 art_table 32 145 0 0 2 0 2 2 0 8 0 art_node 16 33 0 3 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1431 0 29 88 0 88 88 0 8 0 ffsino 272 1431 0 29 94 0 94 94 0 8 0 nchpl 144 1656 0 53 60 0 60 60 0 8 0 uvmvnodes 72 1441 0 0 27 0 27 27 0 8 0 vnodes 208 1441 0 0 76 0 76 76 0 8 0 namei 1024 4238 0 4238 2 1 1 1 0 8 1 percpumem 16 31 0 0 1 0 1 1 0 8 0 scxspl 192 4660 0 4660 8 1 7 7 0 8 7 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 424 248 0 219 4 0 4 4 0 8 0 knotepl 112 47 0 36 1 0 1 1 0 8 0 kqueuepl 144 2 0 0 1 0 1 1 0 8 0 pipepl 304 77 0 70 2 1 1 1 0 8 0 fdescpl 496 233 0 219 3 0 3 3 0 8 0 filepl 152 1129 0 1071 3 0 3 3 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 19 0 9 1 0 1 1 0 8 0 pgrppl 48 19 0 9 1 0 1 1 0 8 0 ucredpl 96 62 0 53 1 0 1 1 0 8 0 zombiepl 144 219 0 218 2 1 1 1 0 8 0 processpl 984 248 0 218 5 0 5 5 0 8 1 procpl 624 256 0 218 4 0 4 4 0 8 1 sockpl 400 87 0 69 2 0 2 2 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 81 0 0 11 0 11 11 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 117 0 0 7 0 7 7 0 8 0 bufpl 280 3054 0 133 209 0 209 209 0 8 0 anonpl 16 22349 0 20728 14 2 12 12 0 124 3 amapchunkpl 152 806 0 740 5 0 5 5 0 158 2 amappl16 192 162 0 131 2 0 2 2 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 42 0 36 1 0 1 1 0 8 0 amappl13 168 22 0 20 2 1 1 1 0 8 0 amappl12 160 7 0 6 2 1 1 1 0 8 0 amappl11 152 52 0 36 1 0 1 1 0 8 0 amappl10 144 14 0 11 1 0 1 1 0 8 0 amappl9 136 241 0 239 1 0 1 1 0 8 0 amappl8 128 275 0 267 1 0 1 1 0 8 0 amappl7 120 114 0 104 1 0 1 1 0 8 0 amappl6 112 24 0 21 2 1 1 1 0 8 0 amappl5 104 136 0 120 1 0 1 1 0 8 0 amappl4 96 500 0 472 1 0 1 1 0 8 0 amappl3 88 105 0 100 1 0 1 1 0 8 0 amappl2 80 920 0 862 3 1 2 2 0 8 0 amappl1 72 15186 0 14762 23 5 18 18 0 8 8 amappl 80 481 0 453 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 24 233 0 219 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 233 0 219 1 0 1 1 0 8 0 vmmpekpl 168 6397 0 6371 2 0 2 2 0 8 0 vmmpepl 168 32765 0 31835 83 11 72 72 0 357 29 vmsppl 368 232 0 219 2 0 2 2 0 8 0 pdppl 4096 473 0 438 6 0 6 6 0 8 1 pvpl 32 114330 0 110345 110 6 104 104 0 265 69 pmappl 232 232 0 219 1 0 1 1 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 235 0 4 7 0 7 7 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 panic(ffffffff823e5c7f) at panic+0x15c pool_cache_get(ffffffff829086d0) at pool_cache_get+0x323 pool_get(ffffffff829086d0,2) at pool_get+0x91 m_get(2,1) at m_get+0x4c ip6_output(fffffd806d822e00,ffffffff827bf1f8,0,1,ffff800020d978b8,0) at ip6_output+0x203 mld6_sendpkt(ffff800000aef080,83,0) at mld6_sendpkt+0x2da mld6_fasttimeo() at mld6_fasttimeo+0x162 pffasttimo(ffffffff827bd7c8) at pffasttimo+0x85 timeout_run(ffffffff827bd7c8) at timeout_run+0xc4 softclock_thread(ffff800020d89110) at softclock_thread+0x16a end trace frame: 0x0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020d70ff0) at x86_ipi_db+0x1a x86_ipi_handler() at x86_ipi_handler+0xc6 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 acpicpu_idle() at acpicpu_idle+0x331 sched_idle(ffff800020d70ff0) at sched_idle+0x3f7 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800020d70ff0) at x86_ipi_db+0x1a x86_ipi_handler() at x86_ipi_handler+0xc6 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 acpicpu_idle() at acpicpu_idle+0x331 sched_idle(ffff800020d70ff0) at sched_idle+0x3f7 end trace frame: 0x0, count: -5 ddb{1}>