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SubjectBUG() in e1000 driver (2.4.20-pre7)
Earlier I had generated a similar crash in a NAPI-fied driver.  I
was able to reproduce it in the default e1000 driver in 2.4.20-pre7
as well. To cause the problem, I send bi-directional tcp/ip traffic
(240Mbps send, 240Mbps receive on two ports on the same machine). It
crashes in around 30 minutes, after about 43,469,910,000 bytes in this case.

This is not a stock kernel: I have some small tweaks to the tcp/ip stack
to allow me to send traffic to myself over the interfaces, so it could be
my fault somehow. I have yet to reproduce this on other machines running
the tulip driver (10/100) though...

Trying to reproduce on 2.4.20-pre4 now...

Machine: dual AMD 2Ghz-equiv, Intel pro/1000 MT nics.
kernel: 2.4.20-pre7
+ send-to-self patch I wrote
+ pktgen patch (happens when module is loaded or not)
* Loaded e1000 driver with TxDescriptors=4096 RxDescriptors=1024

[root@localhost root]# ksymoops < oops2.txt
ksymoops 2.4.4 on i686 2.4.20-pre7. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.20-pre7/ (default)
-m /boot/ (default)

Warning: You did not tell me where to find symbol information. I will
assume that the log matches the kernel and modules that are running
right now and I'll use the default options above for symbol resolution.
If the current kernel and/or modules do not match the log, you can get
more accurate output by telling me the kernel version and where to find
map, modules, ksyms etc. ksymoops -h explains the options.

[root@localhost lanforge]# kernel BUG in header file at line 789
kernel BUG at panic.c:141!
invalid operand: 0000
CPU: 1
EIP: 0010:[<c011c00e>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010296
eax: 00000026 ebx: daff1180 ecx: 00000086 edx: df013f64
esi: d0c edi: 00000046
ds: 0018 es: 0018 ss: 0018
Process btserver (pid: 2846, stackpage=d9f81000)
Stack: c0242ea0 00000315 e08ba8fc 00000315 daff1180 d9f80000 00006a18 0000054e
dee61000 dee6120c dee61000 00000286 d9901400 00000202 db86f540 dee61000
dee611e0 dbab1cc0 dbab1cc0 dbab1d1c c01dd69c 00000287 dee61160 0000000a
Call Trace: [<e08ba8fc>] [<c01dd69c>] [<e08ba4f3>] [<c010a54c>] [<c010a753>]
[<c010cdf8>] [<c0232163>] [<c01ded77>] [<c01df3e6>] [<c01ff550>] [<c021a829>]
[<c01da110>] [<c01e18f0>] [<c022977e>] [<c01da4ff>] [<c01da218>] [<c014c828>]
[<c013c995>] [<c01204bb>] [<c0108bfb>]
Code: 0f 0b 8d 00 da 3b 24 c0 58 5a 90 8d b4 26 00 00 00 00 eb fe

>>EIP; c011c00e <__out_of_line_bug+e/30> <=====
Trace; e08ba8fc <[e1000]e1000_clean_rx_irq+21c/3c0>
Trace; c01dd69c <kfree_skbmem+c/70>
Trace; e08ba4f3 <[e1000]e1000_intr+33/60>
Trace; c010a54c <handle_IRQ_event+5c/90>
Trace; c010a753 <do_IRQ+a3/f0>
Trace; c010cdf8 <call_do_IRQ+5/d>
Trace; c0232163 <__generic_copy_to_user+33/40>
Trace; c01ded77 <memcpy_toiovec+37/60>
Trace; c01df3e6 <skb_copy_datagram_iovec+46/1d0>
Trace; c01ff550 <tcp_recvmsg+630/920>
Trace; c021a829 <inet_recvmsg+39/60>
Trace; c01da110 <sock_recvmsg+30/b0>
Trace; c01e18f0 <netif_receive_skb+190/1c0>
Trace; c022977e <packet_poll+1e/a0>
Trace; c01da4ff <sock_poll+1f/30>
Trace; c01da218 <sock_read+88/a0>
Trace; c014c828 <sys_select+468/480>
Trace; c013c995 <sys_read+95/110>
Trace; c01204bb <sys_gettimeofday+1b/a0>
Trace; c0108bfb <system_call+33/38>
Code; c011c00e <__out_of_line_bug+e/30>
00000000 <_EIP>:
Code; c011c00e <__out_of_line_bug+e/30> <=====
0: 0f 0b ud2a <=====
Code; c011c010 <__out_of_line_bug+10/30>
2: 8d 00 lea (%eax),%eax
Code; c011c012 <__out_of_line_bug+12/30>
4: da 3b fidivrl (%ebx)
Code; c011c014 <__out_of_line_bug+14/30>
6: 24 c0 and $0xc0,%al

Ben Greear <> <Ben_Greear AT>
President of Candela Technologies Inc

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