Hi, How to track the code flow of close() system call for socket fds. In working case I am getting following debug traces in dmesg inet_release sk ffff88040e376000 sk->sk_prot->close ffffffffa0774a50 chelsio_close Entered CPU: 3 PID: 10108 Comm: openssl Tainted: G O 3.17.8_harsh_cry_test_dis #28 Hardware name: Supermicro X8ST3/X8ST3, BIOS 2.0 07/29/10 0000000000000000 ffff8800d87ebde8 ffffffff815e8356 ffffffff81dc21a0 ffff88040e376000 ffff8800d87ebe28 ffffffffa0774a91 ffff88040646f880 ffff88040e376000 0000000000000000 ffff8803fef299c0 ffff8803fef299f0 Call Trace: [<ffffffff815e8356>] dump_stack+0x51/0x6b [<ffffffffa0774a91>] chelsio_close+0x41/0x340 [t4_tom] [<ffffffff815966c0>] inet_release+0xc0/0xd0 [<ffffffff815030b9>] sock_release+0x29/0xa0 [<ffffffff81503582>] sock_close+0x12/0x20 [<ffffffff811bf1b0>] __fput+0xd0/0x260 [<ffffffff811bf3ee>] ____fput+0xe/0x10 [<ffffffff81089e5d>] task_work_run+0xad/0xe0 [<ffffffff81003d74>] do_notify_resume+0x84/0x90 [<ffffffff815ed8da>] int_signal+0x12/0x17 chelsio_close Exit After doing changes in kernel module dumpstack is not getting printed from "chelsio_close" function. I added function entry/exit trace in "sock_release" also. Return value of close() system call is also zero. Its executing successfully but where in kernel code? Regards Harsh Jain