panic: pool_do_get: mbufpl free list modified: page 0xffffff003ec98000; item addr 0xffffff003ec98b00; offset 0x0=0x1a2bd0ed06000100 != 0x1a2bd0edf381baff Stopped at db_enter+0xa: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 63699 75572 0 0x12 0 0 sshd db_enter() at db_enter+0xa sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x147 sys/kern/subr_prf.c:208 pool_do_get(2,ffffffff81e94370,0) at pool_do_get+0x3ae sys/kern/subr_pool.c:752 pool_get(ffff800014a1c958,16c) at pool_get+0x77 sys/kern/subr_pool.c:587 m_copym(ffffff003ec98800,34,ffff800000ac9980,ffffff003ec98a00) at m_copym+0x136 m_get sys/kern/uipc_mbuf.c:237 [inline] m_copym(ffffff003ec98800,34,ffff800000ac9980,ffffff003ec98a00) at m_copym+0x136 sys/kern/uipc_mbuf.c:655 tcp_output(ffff800014a32970) at tcp_output+0x108d sys/netinet/tcp_output.c:673 tcp_usrreq(4614,ffffff0036342908,0,ffffff003ec98a00,0,6e3b56d04316abf2) at tcp_usrreq+0x1c0 sys/netinet/tcp_usrreq.c:331 sosend(ffffff00360b71e8,ffff800014a1cca8,16c,ffff800014a1cd50,0,6e3b56d04316abf2) at sosend+0x462 sys/kern/uipc_socket.c:513 dofilewritev(ffff800014a32970,ffff800014a1cd50,16c,ffff800014a1cd60,7f7ffffc3978) at dofilewritev+0x13e sys/kern/sys_generic.c:364 sys_write(ffff800014a1cdf0,ffff800014a32970,ffff800014a15338) at sys_write+0x6e sys/kern/sys_generic.c:283 syscall(0) at syscall+0x3e4 Xsyscall(0,4,10853c9099b3,4,3,108764d2d280) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc3990, 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.