panic(ffffffff821efea4) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff826426e8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff826426e8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff826426e8,1) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(1,1) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 m_getuio(ffff800020acf1a8,0,4780,ffff800020acf328) at m_getuio+0xe4 sys/kern/uipc_socket.c:581 sosend(fffffd806eb7d968,0,ffff800020acf328,0,0,80) at sosend+0x54e sys/kern/uipc_socket.c:536 dofilewritev(ffff800020adf390,4,ffff800020acf328,0,ffff800020acf410) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020adf390,ffff800020acf3c0,ffff800020acf410) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020acf490) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020acf490) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd0c30, 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{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 0xfffffd806d42b900+16 0x0!=0xea965e7a4065bbc6 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821efea4) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff826426e8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff826426e8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff826426e8,1) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(1,1) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 m_getuio(ffff800020acf1a8,0,4780,ffff800020acf328) at m_getuio+0xe4 sys/kern/uipc_socket.c:581 sosend(fffffd806eb7d968,0,ffff800020acf328,0,0,80) at sosend+0x54e sys/kern/uipc_socket.c:536 dofilewritev(ffff800020adf390,4,ffff800020acf328,0,ffff800020acf410) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020adf390,ffff800020acf3c0,ffff800020acf410) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020acf490) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020acf490) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd0c30, count: -11 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020aceed0 rbx 0xffff800020acef80 rdx 0xffff800020adf390 rcx 0 rax 0 r8 0xffffffff81ce63bf kprintf+0x16f r9 0x1 r10 0x25 r11 0x8bc87efd16e84456 r12 0x3000000008 r13 0xffff800020aceee0 r14 0x100 r15 0x1 rip 0xffffffff815a95a8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020aceec0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (sshd) pid=185783 stat=onproc flags process=12 proc=0 pri=50, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020ade9d0,0xffff800020adeec0 process=0xffff800020ac8798 user=0xffff800020aca000, vmspace=0xfffffd806e9af5c8 estcpu=0, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 73578 307798 88356 0 2 0 syz-executor.0 9326 95521 1 0 3 0x100083 ttyin getty 88356 457999 3293 0 2 0x2 syz-executor.0 73542 506731 0 0 3 0x14200 bored sosplice 61761 340780 3293 0 2 0x2 syz-executor.1 3293 231066 66813 0 3 0x82 thrsleep syz-fuzzer 3293 172613 66813 0 3 0x4000082 nanosleep syz-fuzzer 3293 293205 66813 0 7 0x4000082 syz-fuzzer 3293 342318 66813 0 3 0x4000082 thrsleep syz-fuzzer 3293 191406 66813 0 3 0x4000082 thrsleep syz-fuzzer 3293 29704 66813 0 3 0x4000082 thrsleep syz-fuzzer 3293 203476 66813 0 3 0x4000082 thrsleep syz-fuzzer 3293 363040 66813 0 3 0x4000082 thrsleep syz-fuzzer 3293 108320 66813 0 3 0x4000082 thrsleep syz-fuzzer 3293 204657 66813 0 3 0x4000082 thrsleep syz-fuzzer 66813 85971 5588 0 3 0x10008a pause ksh * 5588 185783 7439 0 7 0x12 sshd 7439 138106 1 0 3 0x80 select sshd 98974 492938 85259 74 3 0x100092 bpf pflogd 85259 479692 1 0 3 0x80 netio pflogd 33997 317993 10324 73 3 0x100090 kqread syslogd 10324 272005 1 0 3 0x100082 netio syslogd 28981 206407 1 77 3 0x100090 poll dhclient 40016 39067 1 0 3 0x80 poll dhclient 4169 173394 0 0 3 0x14200 bored smr 54443 4121 0 0 2 0x14200 zerothread 94475 86620 0 0 3 0x14200 aiodoned aiodoned 51800 500775 0 0 3 0x14200 syncer update 96317 274742 0 0 3 0x14200 cleaner cleaner 63264 7802 0 0 3 0x14200 reaper reaper 66536 178245 0 0 3 0x14200 pgdaemon pagedaemon 86860 484655 0 0 3 0x14200 bored crynlk 20222 292908 0 0 3 0x14200 bored crypto 64168 210171 0 0 3 0x40014200 acpi0 acpi0 77833 57890 0 0 3 0x40014200 idle1 11864 422788 0 0 3 0x14200 bored softnet 77440 113000 0 0 3 0x14200 bored systqmp 82340 248771 0 0 3 0x14200 bored systq 28240 334134 0 0 3 0x40014200 bored softclock 79168 50006 0 0 3 0x40014200 idle0 1 195259 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9550 6423K 7454K 78643K 12027 0 pcb 13 8K 8K 78643K 325 0 rtable 113 12K 13K 78643K 421 0 ifaddr 93 17K 17K 78643K 176 0 counters 45 34K 34K 78643K 73 0 ioctlops 0 0K 4K 78643K 1505 0 iov 0 0K 12K 78643K 80 0 mount 1 1K 1K 78643K 1 0 vnodes 1225 77K 78K 78643K 1660 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 8 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 81 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 5 13K 25K 78643K 514 0 sigio 0 0K 0K 78643K 13 0 proc 63 63K 95K 78643K 525 0 subproc 32 2K 2K 78643K 51 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 151 0 in_multi 63 3K 3K 78643K 150 0 ether_multi 1 0K 0K 78643K 22 0 mrt 0 0K 0K 78643K 10 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 97 440K 440K 78643K 97 0 exec 0 0K 1K 78643K 292 0 pfkey data 0 0K 1K 78643K 4 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 123 104K 104K 78643K 2716 0 UVM aobj 35 2K 2K 78643K 37 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 120 0 NDP 16 0K 0K 78643K 39 0 temp 149 3031K 3098K 78643K 13556 0 kqueue 3 4K 20K 78643K 58 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 10 0 4 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 57 0 55 1 0 1 1 0 8 0 rtentry 112 78 0 36 2 0 2 2 0 8 0 unpcb 120 365 0 355 2 0 2 2 0 8 1 syncache 264 10 0 10 5 4 1 1 0 8 1 tcpqe 32 611 0 611 2 2 0 2 0 8 0 tcpcb 544 585 0 581 1 0 1 1 0 8 0 inpcb 280 1748 0 1741 5 3 2 3 0 8 1 rttmr 72 4 0 4 2 1 1 1 0 8 1 nd6 48 14 0 9 1 0 1 1 0 8 0 pkpcb 40 5 0 5 2 2 0 1 0 8 0 ppxss 1128 6 0 6 3 2 1 1 0 8 1 pffrag 232 16 0 16 2 1 1 1 0 482 1 pffrnode 88 16 0 16 2 1 1 1 0 8 1 pffrent 40 423 0 423 2 1 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 98 0 26 1 0 1 1 0 8 0 pfstkey 112 98 0 26 3 0 3 3 0 8 0 pfstate 328 98 0 26 7 0 7 7 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 256 355 0 166 14 2 12 13 0 8 0 art_table 32 356 0 166 2 0 2 2 0 8 0 art_node 16 75 0 36 1 0 1 1 0 8 0 sysvmsgpl 40 49 0 29 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 75 0 65 1 0 1 1 0 8 0 shmpl 112 35 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2162 0 759 46 0 46 46 0 8 0 ffsino 272 2162 0 759 95 0 95 95 0 8 0 nchpl 144 3196 0 1594 61 0 61 61 0 8 0 uvmvnodes 72 2545 0 0 47 0 47 47 0 8 0 vnodes 208 2545 0 0 134 0 134 134 0 8 0 namei 1024 9407 0 9407 3 2 1 1 0 8 1 percpumem 16 47 0 14 1 0 1 1 0 8 0 vcpupl 1984 11 0 0 2 0 2 2 0 8 0 vmpool 560 17 0 6 1 0 1 1 0 8 0 scxspl 192 9199 0 9199 12 9 3 7 0 8 3 plimitpl 152 66 0 58 1 0 1 1 0 8 0 sigapl 424 729 0 697 4 0 4 4 0 8 0 futexpl 56 11439 0 11439 1 0 1 1 0 8 1 knotepl 112 143 0 124 1 0 1 1 0 8 0 kqueuepl 144 128 0 126 1 0 1 1 0 8 0 pipelkpl 48 168 0 158 1 0 1 1 0 8 0 pipepl 120 336 0 317 2 0 2 2 0 8 1 fdescpl 496 713 0 697 3 0 3 3 0 8 0 filepl 152 6021 0 5921 14 8 6 7 0 8 2 lockfpl 104 199 0 198 1 0 1 1 0 8 0 lockfspl 48 68 0 67 1 0 1 1 0 8 0 sessionpl 112 21 0 10 1 0 1 1 0 8 0 pgrppl 48 27 0 16 1 0 1 1 0 8 0 ucredpl 96 557 0 548 1 0 1 1 0 8 0 zombiepl 144 697 0 697 3 2 1 1 0 8 1 processpl 960 729 0 697 6 1 5 5 0 8 0 procpl 624 1872 0 1831 4 0 4 4 0 8 0 sosppl 128 23 0 23 3 3 0 1 0 8 0 sockpl 400 2190 0 2171 12 7 5 6 0 8 3 mcl64k 65536 262 0 0 33 0 33 33 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 4 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 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 214 0 0 26 0 26 26 0 8 0 mtagpl 80 47 0 0 1 0 1 1 0 8 0 mbufpl 256 447 0 0 26 0 26 26 0 8 0 bufpl 280 5026 0 176 347 0 347 347 0 8 0 anonpl 16 89256 0 71764 96 10 86 87 0 124 14 amapchunkpl 152 4420 0 4287 21 14 7 20 0 158 0 amappl16 192 3823 0 2855 70 13 57 61 0 8 8 amappl15 184 2 0 2 2 2 0 1 0 8 0 amappl14 176 171 0 171 3 3 0 1 0 8 0 amappl13 168 32 0 31 1 0 1 1 0 8 0 amappl12 160 236 0 234 2 1 1 1 0 8 0 amappl11 152 137 0 118 1 0 1 1 0 8 0 amappl10 144 15 0 12 1 0 1 1 0 8 0 amappl9 136 393 0 388 1 0 1 1 0 8 0 amappl8 128 343 0 317 1 0 1 1 0 8 0 amappl7 120 128 0 115 1 0 1 1 0 8 0 amappl6 112 93 0 88 1 0 1 1 0 8 0 amappl5 104 545 0 528 1 0 1 1 0 8 0 amappl4 96 599 0 565 2 1 1 2 0 8 0 amappl3 88 123 0 117 1 0 1 1 0 8 0 amappl2 80 4960 0 4895 3 1 2 3 0 8 0 amappl1 72 26142 0 25719 25 15 10 20 0 8 0 amappl 80 2152 0 2105 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 36 0 2 1 0 1 1 0 8 0 uaddrrnd 24 730 0 703 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 730 0 703 1 0 1 1 0 8 0 vmmpekpl 168 9404 0 9369 2 0 2 2 0 8 0 vmmpepl 168 95463 0 93365 157 31 126 128 0 357 27 vmsppl 368 729 0 703 3 0 3 3 0 8 0 pdppl 4096 1468 0 1417 7 0 7 7 0 8 0 pvpl 32 262618 0 242544 219 20 199 200 0 265 33 pmappl 232 729 0 703 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 236 0 14 7 0 7 7 0 8 0