panic(ffffffff821f3f27) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82644d50) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82644d50) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82644d50,1) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(1,1) at m_get+0x4c sys/kern/uipc_mbuf.c:250 m_getuio(ffff800024d95288,1,43cbc,ffff800024d95350) at m_getuio+0xbe sys/kern/uipc_socket.c:586 sosend(fffffd806395f800,0,ffff800024d95350,0,0,80) at sosend+0x54e sys/kern/uipc_socket.c:536 sendit(ffff800020ad7398,7,ffff800024d95430,0,ffff800024d95510) at sendit+0x52b sys/kern/uipc_syscalls.c:657 sys_sendto(ffff800020ad7398,ffff800024d954c8,ffff800024d95510) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:522 syscall(ffff800024d95590) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800024d95590) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8df86cdbbf0, 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 0xfffffd806d974900+16 0x0!=0x771fe7f72d4310bd ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821f3f27) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82644d50) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82644d50) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82644d50,1) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(1,1) at m_get+0x4c sys/kern/uipc_mbuf.c:250 m_getuio(ffff800024d95288,1,43cbc,ffff800024d95350) at m_getuio+0xbe sys/kern/uipc_socket.c:586 sosend(fffffd806395f800,0,ffff800024d95350,0,0,80) at sosend+0x54e sys/kern/uipc_socket.c:536 sendit(ffff800020ad7398,7,ffff800024d95430,0,ffff800024d95510) at sendit+0x52b sys/kern/uipc_syscalls.c:657 sys_sendto(ffff800020ad7398,ffff800024d954c8,ffff800024d95510) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:522 syscall(ffff800024d95590) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800024d95590) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8df86cdbbf0, count: -11 ddb{1}> show registers rdi 0xffffffff81e7c0f7 db_enter+0x17 rsi 0xece3 __ALIGN_SIZE+0xdce3 rbp 0xffff800024d94fb0 rbx 0xffff800024d95060 rdx 0xece4 __ALIGN_SIZE+0xdce4 rcx 0xffff800020b6c000 rax 0xffff800020b6c000 r8 0xffffffff81e9534f kprintf+0x16f r9 0x1 r10 0x25 r11 0x831857581467c27 r12 0x3000000008 r13 0xffff800024d94fc0 r14 0x100 r15 0x1 rip 0xffffffff81e7c0f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024d94fa0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=285948 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ad69d8,0xffff800020ad7138 process=0xffff800020a93a60 user=0xffff800024d90000, vmspace=0xfffffd807efffb80 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 9170 411262 69305 0 2 0 syz-executor.1 78055 227966 80937 0 2 0 syz-executor.0 *78055 285948 80937 0 7 0x4000000 syz-executor.0 58296 29142 0 0 3 0x14200 bored sosplice 69305 353251 16518 0 3 0x82 nanosleep syz-executor.1 80937 23660 16518 0 7 0x482 syz-executor.0 16518 240537 79155 0 3 0x82 thrsleep syz-fuzzer 16518 361452 79155 0 2 0x4000482 syz-fuzzer 16518 441546 79155 0 3 0x4000082 thrsleep syz-fuzzer 16518 462067 79155 0 3 0x4000082 nanosleep syz-fuzzer 16518 307463 79155 0 3 0x4000082 thrsleep syz-fuzzer 16518 480328 79155 0 3 0x4000082 thrsleep syz-fuzzer 16518 343530 79155 0 3 0x4000082 thrsleep syz-fuzzer 16518 208109 79155 0 3 0x4000082 thrsleep syz-fuzzer 16518 107042 79155 0 3 0x4000082 kqread syz-fuzzer 16518 97819 79155 0 3 0x4000082 thrsleep syz-fuzzer 79155 281664 1732 0 3 0x10008a pause ksh 1732 107985 72866 0 3 0x92 select sshd 2197 215183 1 0 3 0x100083 ttyin getty 72866 253207 1 0 3 0x80 select sshd 24731 511015 73906 74 3 0x100092 bpf pflogd 73906 239158 1 0 3 0x80 netio pflogd 18547 84174 95039 73 3 0x100090 kqread syslogd 95039 353529 1 0 3 0x100082 netio syslogd 22938 462742 1 77 3 0x100090 poll dhclient 61140 504526 1 0 3 0x80 poll dhclient 70925 309584 0 0 3 0x14200 bored smr 9900 290905 0 0 2 0x14200 zerothread 6285 352089 0 0 3 0x14200 aiodoned aiodoned 24198 119987 0 0 3 0x14200 syncer update 69188 445964 0 0 3 0x14200 cleaner cleaner 17837 43644 0 0 3 0x14200 reaper reaper 78392 401378 0 0 3 0x14200 pgdaemon pagedaemon 18116 163263 0 0 3 0x14200 bored crynlk 29784 91898 0 0 3 0x14200 bored crypto 52529 42987 0 0 3 0x40014200 acpi0 acpi0 31797 315332 0 0 3 0x40014200 idle1 83583 172140 0 0 3 0x14200 bored softnet 36761 435586 0 0 3 0x14200 bored systqmp 23634 264644 0 0 3 0x14200 bored systq 46451 53069 0 0 3 0x40014200 bored softclock 16433 511258 0 0 3 0x40014200 idle0 1 420046 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 9485 6402K 7436K 78643K 10793 0 pcb 14 8K 8K 78643K 47 0 rtable 105 3K 3K 78643K 215 0 ifaddr 49 11K 11K 78643K 61 0 counters 43 33K 34K 78643K 47 0 ioctlops 0 0K 4K 78643K 1471 0 iov 0 0K 12K 78643K 8 0 mount 1 1K 1K 78643K 1 0 vnodes 1230 77K 77K 78643K 1295 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 5 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 22 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 6 17K 25K 78643K 164 0 sigio 0 0K 0K 78643K 4 0 proc 60 63K 95K 78643K 444 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 0 0K 0K 78643K 8 0 in_multi 33 2K 2K 78643K 47 0 ether_multi 1 0K 0K 78643K 5 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 61 281K 281K 78643K 61 0 exec 0 0K 1K 78643K 213 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 105 22K 22K 78643K 1307 0 UVM aobj 4 2K 2K 78643K 10 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 20 0 NDP 7 0K 0K 78643K 13 0 temp 81 3018K 3082K 78643K 3207 0 kqueue 3 4K 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 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 23 0 21 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 112 0 100 2 0 2 2 0 8 1 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 14 0 14 1 0 1 1 0 8 1 tcpcb 544 62 0 58 2 0 2 2 0 8 1 inpcb 280 175 0 167 3 0 3 3 0 8 2 nd6 48 6 0 0 1 0 1 1 0 8 0 pkpcb 40 2 0 2 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 90 0 90 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 18 0 0 1 0 1 1 0 8 0 pfstkey 112 18 0 0 1 0 1 1 0 8 0 pfstate 328 18 0 0 2 0 2 2 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 256 189 0 0 12 0 12 12 0 8 0 art_table 32 190 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 22 0 16 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 20 0 10 1 0 1 1 0 8 0 shmpl 112 8 0 6 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1604 0 199 46 0 46 46 0 8 0 ffsino 272 1604 0 199 95 0 95 95 0 8 1 nchpl 144 1992 0 376 61 0 61 61 0 8 0 uvmvnodes 72 1702 0 0 31 0 31 31 0 8 0 vnodes 208 1702 0 0 90 0 90 90 0 8 0 namei 1024 5502 0 5502 1 0 1 1 0 8 1 percpumem 16 34 0 2 1 0 1 1 0 8 0 scxspl 192 5978 0 5978 2 1 1 2 0 8 1 plimitpl 152 27 0 19 1 0 1 1 0 8 0 sigapl 424 380 0 347 4 0 4 4 0 8 0 futexpl 56 1728 0 1728 1 0 1 1 0 8 1 knotepl 112 54 0 35 1 0 1 1 0 8 0 kqueuepl 144 14 0 12 1 0 1 1 0 8 0 pipelkpl 48 102 0 92 1 0 1 1 0 8 0 pipepl 120 204 0 185 1 0 1 1 0 8 0 fdescpl 496 364 0 347 3 0 3 3 0 8 0 filepl 152 2043 0 1938 7 0 7 7 0 8 2 lockfpl 104 35 0 34 1 0 1 1 0 8 0 lockfspl 48 14 0 13 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 96 329 0 320 1 0 1 1 0 8 0 zombiepl 144 347 0 347 1 0 1 1 0 8 1 processpl 960 380 0 347 5 0 5 5 0 8 0 procpl 624 552 0 509 4 0 4 4 0 8 0 sosppl 128 6 0 6 1 0 1 1 0 8 1 sockpl 400 315 0 293 7 0 7 7 0 8 4 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 140 0 0 17 0 17 17 0 8 0 mtagpl 80 21 0 0 1 0 1 1 0 8 0 mbufpl 256 246 0 0 15 0 15 15 0 8 0 bufpl 280 4288 0 175 294 0 294 294 0 8 0 anonpl 16 45431 0 28541 69 1 68 68 0 124 0 amapchunkpl 152 1562 0 1417 8 0 8 8 0 158 1 amappl16 192 1430 0 507 47 0 47 47 0 8 0 amappl15 184 72 0 68 1 0 1 1 0 8 0 amappl14 176 70 0 64 2 1 1 1 0 8 0 amappl13 168 25 0 24 1 0 1 1 0 8 0 amappl12 160 7 0 6 2 1 1 1 0 8 0 amappl11 152 75 0 57 1 0 1 1 0 8 0 amappl10 144 21 0 16 1 0 1 1 0 8 0 amappl9 136 383 0 380 1 0 1 1 0 8 0 amappl8 128 318 0 299 1 0 1 1 0 8 0 amappl7 120 117 0 106 1 0 1 1 0 8 0 amappl6 112 23 0 19 1 0 1 1 0 8 0 amappl5 104 183 0 168 1 0 1 1 0 8 0 amappl4 96 539 0 506 1 0 1 1 0 8 0 amappl3 88 172 0 164 1 0 1 1 0 8 0 amappl2 80 1585 0 1513 3 1 2 3 0 8 0 amappl1 72 16711 0 16266 26 13 13 20 0 8 3 amappl 80 808 0 760 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 9 0 6 1 0 1 1 0 8 0 uaddrrnd 24 364 0 347 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 364 0 347 1 0 1 1 0 8 0 vmmpekpl 168 6280 0 6243 2 0 2 2 0 8 0 vmmpepl 168 49317 0 47177 122 6 116 116 0 357 21 vmsppl 368 363 0 347 2 0 2 2 0 8 0 pdppl 4096 736 0 694 6 0 6 6 0 8 0 pvpl 32 156555 0 136473 170 0 170 170 0 265 8 pmappl 232 363 0 347 2 0 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 173 0 3 5 0 5 5 0 8 0