netdev - Re: 2.6.38-rc5 tcp_connect oops: EIP = 0x0

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Date:	Fri, 18 Feb 2011 07:32:15 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	George Spelvin <linux@...izon.com>
Cc:	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: 2.6.38-rc5 tcp_connect oops: EIP = 0x0

Le vendredi 18 février 2011 à 00:03 -0500, George Spelvin a écrit :
> But wonder of wonders, kernel mode switching worked so I got to see the
> oops on the text-mode console.  It happened just as I tried to ssh out.
> 

CC netdev (removed linux-netdev)

I'll take a look this morning, thanks for the report.

> It's a Core 2 duo laptop (Dell E1405), 2 GB RAM, running a 32-bit kernel.
> It's worth noting that I was using wired internet (b44 driver) and
> not wireless.
> 
> I've been having a lot of weird lockups with 2.6.38-rcX, quite a change
> from the very stable 2.6.36, but this is the first time I booted -rc5.
> Also, the symptoms are very different; before the lockup did not seen
> correlated with any particular activity, but the "lockup" was more like
> something getting wedged in the kernel that more and more tasks would
> get stuck on until everything stopped responding.
> 
> I should mention that this is transcribed by hand from the screen.
> Oh, and also, it is far from the first time I ran ssh this boot.
> (I re-tested it ater rebooting, just to be sure.  Not a consistent
> crash.)
> 
> Anyway, jumping to address 0 looks "interesting", so it seems worth reporting.
> 
> BUG: unable to handle kernel NULL pointer dereference at   (null)
> IP: [<  (null)>]   (null)
> *pde = 00000000
> Oops: 0000 [#1] SMP
> last sysfs file: /sys/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/uevent
> Modules linked in: rfcomm btusb sco l2cap crc16 bluetooth b43 mac80211 cfg80211 [last unloaded: sha256_generic]
> 
> Pid: 12178, comm: ssh Not tainted 2.6.38-rc5 #227 Dell Inc. MXC061                          /0MG532
> EIP: 0060:[<00000000>] EFLAGS: 0021246 CPU: 0
> EIP is at 0x0
> EAX: f5947e00 EBX: f5982f80 ECX: 00000024 EDX: c148fe00
> ESI: f5947e00 EDI: ebf29e54 EBP: ebf29ee0 ESP: ebf29dd0
>  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> Process ssh (pid: 12178, ti=ebf28000 task=ebefc6c0 task.ti = ebef28000)
> Stack:
>  c12c83ea 07e2427d 02000000 7b018f79 c117b827 0b996609 7b018f79 5f5f6644
>  f5982f80 00000000 ebf29e58 ebf29ee0 c12cc0e0 00001600 00000000 00000001
>  03641600 00000000 00000000 00000000 00000000 036423c0 3e6423c0 00000000
> Call Trace:
>  [<c12c83ea>] ? tcp_connect+0xdd/0x3fd
>  [<c117b827>] ? secure_tcp_sequence_number+0x4f/0x65
>  [<c12cc0e0>] ? tcp_v4_connect+0x3c1/0x417
>  [<c12d6726>] ? inet_stream_connect+0x88/0x1fc
>  [<c1110705>] ? _copy_from_user+0x2b/0x10e
>  [<c129307d>] ? sys_connect+0x70/0x98
>  [<c108df0f>] ? get_empty_filp+0x9f/0x121
>  [<c108dfa0>] ? alloc_file+0xf/0x85
>  [<c1293287>] ? sock_alloc_file+0x97/0xeb
>  [<c108b758>] ? fd_install+0x1b/0x38
>  [<c12932f6>] ? sock_map_fd+0x1b/0x20
>  [<c1293bdf>] ? sys_socketcall+0x9d/0x291
>  [<c1002750>] ? sysenter_do_call+0x12/0x26
> Code:  Bad EIP value
> EIP: [<00000000>] 0x0 SS:ESP 0068:ebf29dd0
> CR2: 0000000000000000


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