On Tue, Oct 24, 2017 at 09:00:30AM -0400, Dave Jones wrote:
> divide error: 0000 [#1] SMP KASAN
> CPU: 0 PID: 31140 Comm: trinity-c12 Not tainted 4.14.0-rc6-think+ #1
> RIP: 0010:__tcp_select_window+0x21f/0x400
> Call Trace:
> tcp_cleanup_rbuf+0x27d/0x2a0
> tcp_recvmsg+0x7a9/0x1430
> inet_recvmsg+0x10b/0x360
> sock_read_iter+0x19d/0x240
> do_iter_readv_writev+0x2e4/0x320
> do_iter_read+0x149/0x280
> vfs_readv+0x107/0x180
> do_readv+0xc0/0x1b0
> do_syscall_64+0x182/0x400
> entry_SYSCALL64_slow_path+0x25/0x25
> Code: 41 5e 41 5f c3 48 8d bb 48 09 00 00 e8 4b 2b 30 ff 8b 83 48 09 00 00
> 89 ea 44 29 f2 39 c2 7d 08 39 c5 0f 8d 86 01 00 00 89 e8 99 <41> f7 fe 89 e8
> 29 d0 eb 8c 41 f7 df 48 89 c7 44 89 f9 d3 fd e8
> RIP: __tcp_select_window+0x21f/0x400 RSP: ffff8803df54f418
>
>
> if (window <= free_space - mss || window > free_space)
> window = rounddown(free_space, mss);
I'm still hitting this fairly often, so I threw in a debug patch, and
when this happens..
[53182.361210] window: 0 free_space: 0 mss: 0
Any suggestions on what we should default the window size to be in
this situation to avoid the rounddown ?
Dave
