Messages in this thread |  | | Subject | Re: 2.6.25-rc8: WARNING: at net/ipv4/tcp_input.c:2173 tcp_mark_head_lost+0x11d/0x150() | From | Soeren Sonnenburg <> | Date | Sat, 05 Apr 2008 18:40:34 +0200 |
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On Fri, 2008-04-04 at 21:51 +0300, Ilpo Järvinen wrote: > On Thu, 3 Apr 2008, Soeren Sonnenburg wrote: > > > On Thu, 2008-04-03 at 16:26 +0300, Ilpo Järvinen wrote: > > > On Thu, 3 Apr 2008, Soeren Sonnenburg wrote: > > > > > > > trying to download things, I am seeing this (ignore the tainted, it is > > > > from madwifi and although the module is loaded the device was never > > > > used) > > > > > > > > Could anyone make sense of this please? > > > > > > ...I'm just trying to find out who and where invariants of the TCP code > > > are broken. These were relatively recently enabled (pre-2.6.24 just didn't > > > care too much). A number of long standing issues plus bugs from my > > > modifications have been fixed because of the more rigid checking :-). > > > > > > > ------------[ cut here ]------------ > > > > WARNING: at net/ipv4/tcp_input.c:2173 tcp_mark_head_lost+0x11d/0x150() > > > > > > > ------------[ cut here ]------------ > > > > WARNING: at net/ipv4/tcp_input.c:1771 tcp_enter_frto+0x267/0x270() > > > > > > > ------------[ cut here ]------------ > > > > WARNING: at net/ipv4/tcp_input.c:2532 tcp_ack+0x1a6f/0x1d60() > > > > > > Can you reproduce it? > > > > Yes, by massively downloading things :-) But I have no real recipe to > > make it easily reproducible... > > Good :-), no need for recipes, just that you can trigger it more often > tha once per month or so :-). I probably couldn't trigger it anyway here > because they're often rather sensitive to network "weather", thus if you > have problems in reproducing, doing tests around the same phase of the > date cycle you saw it the first time might help. > > Here's a debug patch which expensively verifies TCP's state in a number > of places during ACK to find first spot where the actual bug occurs.
OK I am getting this now as the first spot:
P: 4 L: 2 vs 2 S: 0 vs 3 F: 0 vs 0 w: 4023500226-4023505874 (0) skb 0 f495c180 skb 1 f480a180 skb 2 f4994600 head 3 f495c780 skb 4 f5b32480 TCP wq(s) LL < WARNING: at net/ipv4/tcp_ipv4.c:240 tcp_verify_wq+0x319/0x3c0()
another one: WARNING: at net/ipv4/tcp_output.c:1475 __tcp_push_pending_frames+0x70/0x830()
P: 4 L: 2 vs 2 S: 0 vs 3 F: 0 vs 0 w: 4023500226-4023505874 (0) skb 0 f495c180 skb 1 f480a180 skb 2 f4994600 head 3 f495c780 skb 4 f5b32480 TCP wq(s) LL < TCP wq(h) +-++< l2 s3 f0 p4 seq: su4023500226 hs241530103 sn4023505874 ------------[ cut here ]------------ WARNING: at net/ipv4/tcp_ipv4.c:240 tcp_verify_wq+0x319/0x3c0()
Soeren -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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