Comment 3 for bug 1630413

We also encountered this issue with 2.4.7-1ubuntu4.17
I can reproduce it from times to times with a light parralel load (50-200 requests in //)

Here is some details:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f811d7fa700 (LWP 26536)]
process_socket (my_thread_num=8, my_child_num=<optimized out>, cs=0x7f81241962b8, sock=<optimized out>, p=<optimized out>, thd=<optimized out>) at event.c:1064
1064 event.c: No such file or directory.
(gdb) bt
#0 process_socket (my_thread_num=8, my_child_num=<optimized out>, cs=0x7f81241962b8, sock=<optimized out>, p=<optimized out>, thd=<optimized out>) at event.c:1064
#1 worker_thread (thd=<optimized out>, dummy=<optimized out>) at event.c:1815
#2 0x00007f8129ec6184 in start_thread (arg=0x7f811d7fa700) at pthread_create.c:312
#3 0x00007f8129bf2ffd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
(gdb) bt full
#0 process_socket (my_thread_num=8, my_child_num=<optimized out>, cs=0x7f81241962b8, sock=<optimized out>, p=<optimized out>, thd=<optimized out>) at event.c:1064
        c = 0x7f8124196330
        sbh = 0x7f8124196908
        conn_id = <optimized out>
        rc = <optimized out>
#1 worker_thread (thd=<optimized out>, dummy=<optimized out>) at event.c:1815
        ti = <optimized out>
        process_slot = <optimized out>
        thread_slot = 8
        csd = 0x7f81241960b0
        cs = 0x7f81241962b8
        ptrans = 0x7f8124196028
        rv = <optimized out>
        is_idle = 0
        te = 0x0
#2 0x00007f8129ec6184 in start_thread (arg=0x7f811d7fa700) at pthread_create.c:312
        __res = <optimized out>
        pd = 0x7f811d7fa700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140192522413824, -4554003917395454359, 0, 0, 140192522414528, 140192522413824, 4597849143617525353, 4597821488042743401}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0},
            data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#3 0x00007f8129bf2ffd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
(gdb) p c
$1 = (conn_rec *) 0x7f8124196330
(gdb) p *c
Cannot access memory at address 0x7f8124196330
(gdb) p cs
$2 = (event_conn_state_t *) 0x7f81241962b8
(gdb) p *cs
Cannot access memory at address 0x7f81241962b8

And the corresponding core. If you need more information, please ask