panic: pool_do_get: mbufpl free list modified: page 0xffffff0038c40000; item addr 0xffffff0038c40700; offset 0x0=0x8ebe3c906000100 != 0x8ebe3c9c56d8c8f Stopped at db_enter+0xa: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND *351575 93454 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,ffffffff81e94370,10) at pool_do_get+0x3ae sys/kern/subr_pool.c:752 pool_get(2,2) at pool_get+0x77 sys/kern/subr_pool.c:587 m_gethdr(580,34) at m_gethdr+0x2f sys/kern/uipc_mbuf.c:270 tcp_output(ffff800014a339d8) at tcp_output+0xfdb sys/netinet/tcp_output.c:654 tcp_usrreq(2304,ffffff0036336488,0,ffffff0038c40600,0,62171352552a0d18) at tcp_usrreq+0x1c0 sys/netinet/tcp_usrreq.c:331 sosend(ffffff00360a8260,ffff800014a202b8,247c,ffff800014a20360,0,62171352552a0d18) at sosend+0x462 sys/kern/uipc_socket.c:513 dofilewritev(ffff800014a339d8,ffff800014a20360,247c,ffff800014a20370,7f7ffffc7708) at dofilewritev+0x13e sys/kern/sys_generic.c:364 sys_write(ffff800014a20400,ffff800014a339d8,ffff800014a15660) at sys_write+0x6e sys/kern/sys_generic.c:283 syscall(0) at syscall+0x3e4 Xsyscall(6,4,6e3276099b3,4,3,6e549544840) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc7720, 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.