Messages in this thread |  | | From | "captain smp" <> | Subject | sock_sendmsg() from a kernel thread question | Date | Tue, 02 Oct 2001 21:10:54 +0000 |
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I am trying to call sock_sendmsg() from a kernel thread and it seems to work fine on a UP system but on SMP system it hangs up and the thread can't even accept a SIGKILL. It it stuck after the following calls happen:
sock_sendmsg() sock->ops->sendmsg() tcp_do_sendmsg()
then tcp_do_sendmsg() calls:
skb = sock_wmalloc(sk, tmp, 0, GFP_KERNEL);
but that call never returns. It doesn't get to the code where the comment says: "If we didn't get any memory, we need to sleep."
I've mucked with sock->sk->allocation flavors but to no avail.
BTW, this is 2.2.16-22 (stock red hat 6.2 kernel)
Is this fixed in later kernels, or is there some semaphore/spinlock needed to call sock_sendmsg()/recvmsg() from kernel threads?
Is there a race with skbuff allocation/deallocation from the NET_BH network bottom half handler or NIC interrupt handler that I can prevent from happening somehow?
-Captain
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