linux-kernel - __pm_runtime_resume() returns -1 Was: Regression in 2.6.36

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Date:	Fri, 22 Oct 2010 15:38:01 +0200
From:	Christian Bahls <lkml@...52.de>
To:	linux-kernel@...r.kernel.org
Subject: __pm_runtime_resume() returns -1 Was: Regression in 2.6.36

Thanks to the help by Matthias Schniedermeyer
 i was able to bisect the change in less than 24 hours

The regression seems to have been introduced by the merge:
  92b4522f72916ff2675060e29e4b24cf26ab59ce

Parent: 67a3e12b05e055c0415c556a315a3d3eb637e29e (Linux 2.6.35-rc1)
Parent: 2903037400a26e7c0cc93ab75a7d62abfacdf485 (net: fix
sk_forward_alloc corruptions)
Branches: compile, remotes/origin/master, work
Follows: v2.6.35-rc1
Precedes: v2.6.36-rc1

    Merge branch 'master' of
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

Which (according to git bisect visualize) contains following Change:

Author: Eric Dumazet <eric.dumazet@...il.com>  2010-05-29 09:20:48
Committer: David S. Miller <davem@...emloft.net>  2010-05-29 09:20:48
Child:  92b4522f72916ff2675060e29e4b24cf26ab59ce (Merge branch
'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6)
Branches: compile, master, remotes/origin/master, remotes/v35/master, work
Follows: v2.6.34
Precedes: first_bad, v2.6.35-rc2

    net: fix sk_forward_alloc corruptions

    As David found out, sock_queue_err_skb() should be called with socket
    lock hold, or we risk sk_forward_alloc corruption, since we use non
    atomic operations to update this field.

    This patch adds bh_lock_sock()/bh_unlock_sock() pair to three spots.
    (BH already disabled)

    1) skb_tstamp_tx()
    2) Before calling ip_icmp_error(), in __udp4_lib_err()
    3) Before calling ipv6_icmp_error(), in __udp6_lib_err()

    Reported-by: Anton Blanchard <anton@...ba.org>
    Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
    Signed-off-by: David S. Miller <davem@...emloft.net>

------------------------------ net/core/skbuff.c ------------------------------
index 4667d4d..f2913ae 100644
@@ -2992,7 +2992,11 @@ void skb_tstamp_tx(struct sk_buff *orig_skb,
 	memset(serr, 0, sizeof(*serr));
 	serr->ee.ee_errno = ENOMSG;
 	serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
+
+	bh_lock_sock(sk);
 	err = sock_queue_err_skb(sk, skb);
+	bh_unlock_sock(sk);
+
 	if (err)
 		kfree_skb(skb);
 }

-------------------------------- net/ipv4/udp.c --------------------------------
index b9d0d40..acdc9be 100644
@@ -634,7 +634,9 @@ void __udp4_lib_err(struct sk_buff *skb, u32 info,
struct udp_table *udptable)
 		if (!harderr || sk->sk_state != TCP_ESTABLISHED)
 			goto out;
 	} else {
+		bh_lock_sock(sk);
 		ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1));
+		bh_unlock_sock(sk);
 	}
 	sk->sk_err = err;
 	sk->sk_error_report(sk);

-------------------------------- net/ipv6/udp.c --------------------------------
index 87be586..3048f90 100644
@@ -466,9 +466,11 @@ void __udp6_lib_err(struct sk_buff *skb, struct
inet6_skb_parm *opt,
 	if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
 		goto out;

-	if (np->recverr)
+	if (np->recverr) {
+		bh_lock_sock(sk);
 		ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
-
+		bh_unlock_sock(sk);
+	}
 	sk->sk_err = err;
 	sk->sk_error_report(sk);
 out:


On Thu, Oct 21, 2010 at 5:24 PM, Matthias Schniedermeyer <ms@...d.de> wrote:
> On 21.10.2010 16:34, Christian Bahls wrote:
>> Dear List
>>
>> PPS: bisecting this regression seems to be out of question
>>  recompiling the kernel on this computer takes a few hours
>>  as all the other computers i use are 64bit
>>  i would alternatively have to setup a cross-compilation environment
>>  which i have not done in years (and not without rocklinux either)
>
> As far as it is my experience, x86 32bit/64bit can build each other.
>
> On the "big" machine just add "ARCH=x86" to (all!) make invocations.
> ARCH=x86 makes "CONFIG_64BIT" an actual configuration option and
> honours whatever is configured in the .config-file.
>
>
>
>
>
> Bis denn
>
> --
> Real Programmers consider "what you see is what you get" to be just as
> bad a concept in Text Editors as it is in women. No, the Real Programmer
> wants a "you asked for it, you got it" text editor -- complicated,
> cryptic, powerful, unforgiving, dangerous.
>
>
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