On Mon, 5 Oct 2015 at 15:42 Daniel-Constantin Mierla <miconda@gmail.com> wrote:

Hello,

the only recent change in the tcp core was resetting a flag to avoid infinite log messages (until connection was closed) via commit d36734d658cd0bcfc8357c7e85ca32da0612aaee .

Does it happen often, or you got it just once so far?

Cheers,
Daniel

On 05/10/15 08:29, Jason Penton wrote:

Hey guys,

Not sure if there have been any changes but I have an interesting problem here when using TCP:

The BT is as follows:

#0 local_timer_list_expire (h=0xa0f128 <tcp_reader_ltimer+178664>, t=723807134, l=0x9e3740 <tcp_reader_ltimer>) at local_timer.c:198

#1 local_timer_expire (t=723807134, h=<optimized out>) at local_timer.c:227

#2 local_timer_run (lt=lt@entry=0x9e3740 <tcp_reader_ltimer>, saved_ticks=723807150) at local_timer.c:250

#3 0x00000000005d8417 in tcp_reader_timer_run () at tcp_read.c:1682

#4 tcp_receive_loop (unix_sock=<optimized out>) at tcp_read.c:1734

#5 0x00000000005c81c8 in tcp_init_children () at tcp_main.c:4788

#6 0x00000000004a9da3 in main_loop () at main.c:1664

#7 0x000000000042411e in main (argc=<optimized out>, argv=<optimized out>) at main.c:2566

This seems to be related to clearing timers for TCP connections. The crash is related to the following code:

_timer_rm_list(tl)

where it does a null pointer deref on tl->next and tl->prev, which, according to the bt, are null (see below).

(gdb) print *tl

$14 = {next = 0x0, prev = 0x0, expire = 723807134, initial_timeout = 32, data = 0x7fbbb05aa628, f = 0x5d02f0 <tcpconn_read_timeout>, flags = 512, slow_idx = 0}

Any ideas?

Cheers

Jason
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Daniel-Constantin Mierla
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