Re: Stack usage

So, here's one path that generates a stack overflow warning:

chown -> ... cfs_flush -> ... cfs_proc_write -> ... 
ext3_ordered_writepage -> ... drbd_send_dblock -> ... tcp_sendpage -> ...

Yow, that's a deap stack!

The big stack space users are:

252 cfsd_write
224 sock_sendmsg
196 ip_queue_xmit
144 mpage_writepages
124 cfs_proc_write
120 generic_make_request
112 tcp_sendmsg
104 __filemap_fdatawrite_range
104 __filemap_fdatawrite_range (in twice 'cos it's called twice due to fs stacking).
100 drbd_make_request_common

Here's the backtrace in all it's gory details:

do_IRQ: stack overflow: 504
 [<c01079ee>] dump_stack+0x1e/0x20
 [<c01094ce>] __overflow+0x1e/0x20
 [<c0109477>] do_IRQ+0xb7/0xf0
 =======================
 [<c0107426>] common_interrupt+0x1a/0x20
 [<c014ed76>] enable_irq+0x46/0xe0
 [<d089c3cc>] ei_start_xmit+0x14c/0x2d0 [8390]
 [<c041b1bb>] qdisc_restart+0x6b/0x230
 [<c040921f>] dev_queue_xmit+0x24f/0x310
 [<c042a463>] ip_finish_output+0x103/0x2d0
 [<c042aae2>] ip_output+0x52/0x70
 [<c042ad91>] ip_queue_xmit+0x291/0x5d0
 [<c043ccc9>] tcp_transmit_skb+0x3b9/0x770
 [<c043d193>] tcp_push_one+0x93/0x160
 [<c0431368>] tcp_sendmsg+0xd58/0x1160
 [<c0453179>] inet_sendmsg+0x49/0x60
 [<c03fde9f>] sock_sendmsg+0xbf/0x100
 [<c03fdf22>] kernel_sendmsg+0x42/0x50
 [<c0401a51>] sock_no_sendpage+0x61/0x80
 [<c04305b7>] tcp_sendpage+0x47/0xa0
 [<d08f0736>] _drbd_send_page+0x106/0x180 [drbd]
 [<d08f0a80>] drbd_send_dblock+0x2d0/0x3f0 [drbd]
 [<d08ea663>] drbd_make_request_common+0x7b3/0x940 [drbd]
 [<d08ea8dd>] drbd_make_request_26+0xed/0x2c0 [drbd]
 [<c0389efa>] generic_make_request+0xca/0x270
 [<c038a0f9>] submit_bio+0x59/0xf0
 [<c0175a5a>] submit_bh+0x13a/0x190
 [<c0173f32>] __block_write_full_page+0x202/0x370
 [<c0175836>] block_write_full_page+0x106/0x130
 [<d09587e4>] ext3_ordered_writepage+0xe4/0x1f0 [ext3]
 [<c019a515>] mpage_writepages+0x245/0x400
 [<c0156a32>] do_writepages+0x42/0x50
 [<c014fb2f>] __filemap_fdatawrite_range+0x9f/0xb0
 [<c014fbb6>] filemap_fdatawrite_range+0x36/0x40
 [<c014fdbf>] sync_page_range+0x8f/0x100
 [<c01533cb>] generic_file_writev+0xab/0xe0
 [<c02db504>] cfsd_write+0x254/0x2c0
 [<c02d5a9e>] cfs_proc_write+0x2fe/0x3f0
 [<c02d1798>] cfs_async_handler_write+0x58/0x200
 [<c02d1b42>] cfs_flush_one+0x172/0x250
 [<c02d1c71>] cfs_flush_list+0x51/0xb0
 [<c02d2248>] cfs_flush_inode+0x88/0xc0
 [<c02d0c7e>] cfs_writepages+0xce/0x180
 [<c0156a17>] do_writepages+0x27/0x50
 [<c014fb2f>] __filemap_fdatawrite_range+0x9f/0xb0
 [<c014fb72>] filemap_fdatawrite+0x32/0x40
 [<c02cc29f>] cfs_setattr+0x1ff/0x320
 [<c018fe70>] notify_change+0x2a0/0x2f7
 [<c016fb5e>] chown_common+0xbe/0x100
 [<c016fc98>] sys_fchown+0x38/0x50
 [<c0106997>] sysenter_past_esp+0x54/0x75



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