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Date: Wed, 29 Jul 2009 13:54:27 +0530 From: manu gautam <manugautam25@...mail.com> To: <netdev@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org> Subject: FW: System Hang while trying to send over TCP socket with very less free m/m Hi, I am running 2.6.12 kernel with kernel PREEMPTION being OFF. While sending data over TCP socket I am experiencing system hang. What is happening actually is that the system is low in free memory and the sk_stream_alloc_pskb call in tcp_sendmsg fails and the control goes to "sk_stream_wait_memory" function. Inside this function we are calling schedule_timeout only if "sk_stream_memory_free(sk) && vm_wait" check is false. In my case what happens is that this check is always true and we don't do schedule_timeout which results in the system hang. With preemption being OFF it becomes a kind of deadlock where the one thread is waiting for the memory to be freed but it is not getting scheduled out. I also checked on the latest kernel but there also I dont see any fix for this issue. Please excuse me if I have pasted it to some wrong mailing list. Regards,Manu _________________________________________________________________ Missed any of the IPL matches ? Catch a recap of all the action on MSN Videos http://msnvideos.in/iplt20/msnvideoplayer.aspx-- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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