login: panic: pool_do_put: mcl2k: double pool_put: 0xffffff007513b800 Stopped at db_enter+0xa: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 1487 55431 0 0 0x4000000 0 syz-executor1 db_enter() at db_enter+0xa panic() at panic+0x147 pool_do_put(ffffff007513b800,ffffffff81ec0020) at pool_do_put+0x2e2 pool_put(0,ffffff0064eb0900) at pool_put+0x37 m_extfree(61621a5f44e92fdb) at m_extfree+0xb1 m_free(ffffff0064eb0900) at m_free+0xee m_freem(16) at m_freem+0x2d soreceive(0,ffffff006e714d88,ffff800021165de0,1272,ffff800021165e70,ffff800021165d80) at soreceive+0x1131 recvit(ffff800021165ea0,ffff800021165fa8,ffff800021165f90,ffff8000ffffc710,0) at recvit+0x28c sys_recvmsg(ffff800021166030,ffff8000ffffc710,ffff8000210a6628) at sys_recvmsg+0x120 syscall(0) at syscall+0x3e4 Xsyscall(6,0,ffffffffffffffbf,0,3,98c5b97c010) at Xsyscall+0x128 end of kernel end trace frame: 0x98f080f1dd0, 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.