panic(ffffffff821cde0a) at panic+0x15c sys/kern/subr_prf.c:207 __assert(ffffffff82225390,ffffffff8220f867,29f,ffffffff821f3453) 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 pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806f230100+16 0x0!=0x1e83db4e876bd9f3 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821cde0a) at panic+0x15c sys/kern/subr_prf.c:207 __assert(ffffffff82225390,ffffffff8220f867,29f,ffffffff821f3453) 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 0xffff800021b97da0 rbx 0xffff800021b97e50 rdx 0xffff800020ad6508 rcx 0 rax 0 r8 0xffffffff81a171ef kprintf+0x16f r9 0x1 r10 0x25 r11 0xea632bbe4519adb1 r12 0x3000000008 r13 0xffff800021b97db0 r14 0x104 r15 0x1 rip 0xffffffff81dc97a8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021b97d90 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=186157 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ad6780,0xffffffff826184b0 process=0xffff800020af4000 user=0xffff800021b92000, vmspace=0xfffffd807f000a10 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 54008 321657 68678 0 2 0 syz-executor.1 54008 208692 68678 0 7 0x4000000 syz-executor.1 *54008 186157 68678 0 7 0x4000000 syz-executor.1 4937 273248 73068 0 3 0x80 nanosleep syz-executor.0 4937 472324 73068 0 3 0x4000080 ttyout syz-executor.0 16822 11996 0 0 3 0x14200 acct acct 87008 430710 0 0 3 0x14200 bored sosplice 68678 321575 499 0 3 0x82 nanosleep syz-executor.1 73068 75932 499 0 3 0x82 nanosleep syz-executor.0 499 117394 52004 0 3 0x82 kqread syz-fuzzer 499 86540 52004 0 3 0x4000082 nanosleep syz-fuzzer 499 166155 52004 0 3 0x4000082 thrsleep syz-fuzzer 499 311149 52004 0 3 0x4000082 thrsleep syz-fuzzer 499 460480 52004 0 3 0x4000082 nanosleep syz-fuzzer 499 487277 52004 0 3 0x4000082 thrsleep syz-fuzzer 499 211098 52004 0 3 0x4000082 thrsleep syz-fuzzer 499 224345 52004 0 3 0x4000082 thrsleep syz-fuzzer 499 142539 52004 0 3 0x4000082 thrsleep syz-fuzzer 499 456770 52004 0 3 0x4000082 thrsleep syz-fuzzer 52004 481124 62710 0 3 0x10008a pause ksh 62710 99720 48508 0 3 0x92 select sshd 92231 55902 1 0 3 0x100083 ttyin getty 48508 437557 1 0 3 0x80 select sshd 63517 402573 76938 74 3 0x100092 bpf pflogd 76938 460307 1 0 3 0x80 netio pflogd 5215 3949 53852 73 3 0x100090 kqread syslogd 53852 337267 1 0 3 0x100082 netio syslogd 65995 484642 1 77 3 0x100090 poll dhclient 86578 172246 1 0 3 0x80 poll dhclient 9055 267083 0 0 2 0x14200 zerothread 46942 354807 0 0 3 0x14200 aiodoned aiodoned 35425 195598 0 0 3 0x14200 syncer update 60954 88746 0 0 3 0x14200 cleaner cleaner 59425 142750 0 0 3 0x14200 reaper reaper 39985 134830 0 0 3 0x14200 pgdaemon pagedaemon 92167 193010 0 0 3 0x14200 bored crynlk 62136 436114 0 0 3 0x14200 bored crypto 67814 82840 0 0 3 0x40014200 acpi0 acpi0 93492 20476 0 0 3 0x40014200 idle1 1589 488030 0 0 3 0x14200 bored softnet 55580 183016 0 0 3 0x14200 bored systqmp 65674 133802 0 0 3 0x14200 bored systq 86957 92428 0 0 3 0x40014200 bored softclock 36544 367908 0 0 3 0x40014200 idle0 28224 173965 0 0 3 0x14200 bored smr 1 380329 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 54008 (syz-executor.1) thread 0xffff800020ad6780 (208692) exclusive rwlock netlock r = 0 (0xffffffff824a5dd8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sosend+0x559 sys/kern/uipc_socket.c:537 #3 sendit+0x52b sys/kern/uipc_syscalls.c:657 #4 sys_sendto+0x80 sys/kern/uipc_syscalls.c:522 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #6 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9521 6416K 7314K 78643K 11097 0 pcb 13 8K 8K 78643K 70 0 rtable 99 4K 4K 78643K 353 0 ifaddr 75 15K 15K 78643K 124 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1480 0 iov 0 0K 16K 78643K 63 0 mount 1 1K 1K 78643K 1 0 vnodes 1226 77K 77K 78643K 1377 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 9 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 26 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 6 17K 25K 78643K 236 0 sigio 0 0K 0K 78643K 9 0 proc 62 63K 95K 78643K 471 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 1 0K 0K 78643K 69 0 in_multi 48 2K 3K 78643K 111 0 ether_multi 1 0K 0K 78643K 9 0 mrt 1 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 85 387K 387K 78643K 85 0 exec 0 0K 1K 78643K 223 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 109 37K 38K 78643K 1764 0 UVM aobj 79 5K 5K 78643K 81 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 26 0 NDP 12 0K 0K 78643K 27 0 temp 132 3018K 3082K 78643K 16058 0 kqueue 3 4K 10K 78643K 57 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 11 0 5 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 31 0 29 1 0 1 1 0 8 0 rtentry 112 76 0 38 2 0 2 2 0 8 0 unpcb 120 230 0 219 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 212 0 212 2 2 0 2 0 8 0 tcpcb 544 319 0 314 3 1 2 2 0 8 1 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 2 0 2 1 1 0 1 0 8 0 inpcb 280 604 0 593 2 0 2 2 0 8 1 rttmr 72 1 0 1 1 1 0 1 0 8 0 nd6 48 8 0 6 1 0 1 1 0 8 0 ppxss 1128 7 0 7 1 0 1 1 0 8 1 pffrag 232 2 0 2 1 0 1 1 0 482 1 pffrnode 88 2 0 2 1 0 1 1 0 8 1 pffrent 40 4 0 4 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 42 0 7 1 0 1 1 0 8 0 pfstkey 112 42 0 7 2 0 2 2 0 8 0 pfstate 328 42 0 7 4 0 4 4 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 3 0 1 3 1 2 3 0 8 0 art_heap4 256 371 0 164 18 2 16 16 0 8 1 art_table 32 374 0 165 3 0 3 3 0 8 0 art_node 16 74 0 40 1 0 1 1 0 8 0 sysvmsgpl 40 55 0 31 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 22 0 12 1 0 1 1 0 8 0 shmpl 112 79 0 2 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1726 0 318 46 0 46 46 0 8 0 ffsino 272 1726 0 318 95 0 95 95 0 8 0 nchpl 144 2317 0 696 61 0 61 61 0 8 0 uvmvnodes 72 1889 0 0 35 0 35 35 0 8 0 vnodes 208 1889 0 0 100 0 100 100 0 8 0 namei 1024 7077 0 7077 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 2 0 0 1 0 1 1 0 8 0 vmpool 560 2 0 0 1 0 1 1 0 8 0 scxspl 192 6429 0 6429 9 7 2 7 0 8 2 plimitpl 152 30 0 22 1 0 1 1 0 8 0 sigapl 432 435 0 419 3 1 2 3 0 8 0 futexpl 56 6933 0 6933 1 0 1 1 0 8 1 knotepl 112 152 0 133 1 0 1 1 0 8 0 kqueuepl 104 142 0 140 1 0 1 1 0 8 0 pipelkpl 48 174 0 164 1 0 1 1 0 8 0 pipepl 120 348 0 329 2 1 1 2 0 8 0 fdescpl 496 436 0 419 3 0 3 3 0 8 0 filepl 152 3803 0 3697 8 2 6 7 0 8 1 lockfpl 104 73 0 72 1 0 1 1 0 8 0 lockfspl 48 25 0 24 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 587 0 578 1 0 1 1 0 8 0 zombiepl 144 419 0 419 1 0 1 1 0 8 1 processpl 896 453 0 419 4 0 4 4 0 8 0 procpl 632 987 0 941 5 0 5 5 0 8 1 srpgc 64 1 0 1 1 1 0 1 0 8 0 sosppl 128 5 0 5 2 1 1 1 0 8 1 sockpl 400 868 0 844 6 2 4 6 0 8 1 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 10 0 0 2 0 2 2 0 8 0 mcl2k 2048 263 0 0 32 0 32 32 0 8 0 mtagpl 80 14 0 0 1 0 1 1 0 8 0 mbufpl 256 277 0 0 17 0 17 17 0 8 0 bufpl 280 6765 0 1340 388 0 388 388 0 8 0 anonpl 16 63383 0 46702 85 1 84 84 0 125 16 amapchunkpl 152 2388 0 2250 9 0 9 9 0 158 3 amappl16 192 2474 0 1561 60 6 54 57 0 8 8 amappl15 184 167 0 160 1 0 1 1 0 8 0 amappl14 176 29 0 27 1 0 1 1 0 8 0 amappl12 160 7 0 6 1 0 1 1 0 8 0 amappl11 152 54 0 39 1 0 1 1 0 8 0 amappl10 144 10 0 6 1 0 1 1 0 8 0 amappl9 136 601 0 598 1 0 1 1 0 8 0 amappl8 128 117 0 98 1 0 1 1 0 8 0 amappl7 120 112 0 100 1 0 1 1 0 8 0 amappl6 112 70 0 62 1 0 1 1 0 8 0 amappl5 104 132 0 118 1 0 1 1 0 8 0 amappl4 96 693 0 663 1 0 1 1 0 8 0 amappl3 88 124 0 117 1 0 1 1 0 8 0 amappl2 80 2701 0 2616 3 0 3 3 0 8 0 amappl1 72 19789 0 19314 25 14 11 21 0 8 0 amappl 80 1240 0 1194 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 18 0 17 1 0 1 1 0 8 0 aobjpl 64 80 0 2 2 0 2 2 0 8 0 uaddrrnd 24 438 0 419 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 438 0 419 1 0 1 1 0 8 0 vmmpekpl 168 7528 0 7489 2 0 2 2 0 8 0 vmmpepl 168 61182 0 58979 117 11 106 114 0 357 10 vmsppl 368 437 0 419 2 0 2 2 0 8 0 pdppl 4096 883 0 840 6 0 6 6 0 8 0 pvpl 32 195965 0 175985 202 0 202 202 0 265 39 pmappl 232 437 0 419 3 1 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 195 0 9 6 0 6 6 0 8 0