Web surfing breaks w/ 2.6.27-7

[mbobak]

Ok, this is really strange.

I'm running 8.10, completely up-to-date as of today, on a Dell D630,
which has a BCM4312 (rev 01).

The default kernel for 8.10 is 2.6.27-7. But, if I boot into 2.6.24-21,
everything works fine, I'm using it to write this post. But, if I boot into 2.6.27-7, I can't surf the web! That's NOT to say my network is broken. I can 'ping google.com' successfully. But, if I run firefox and enter 'google.com', firefox says "contacting google.com" and hangs indefinitely.... As soon as I boot back into 2.6.24-21, everything works fine again.

Some other salient facts:

In both cases, bcm43xx is blacklisted, and the kernel loads ssb & b44.

When firefox is hanging, an strace reveals it looping very tightly and producing the following output:

poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=8, events=POLLIN|POLLPRI}, {fd=12, events=POLLIN|POLLPRI}, {fd=13, events=POLLIN|POLLPRI}, {fd=14, events=POLLIN|POLLPRI}, {fd=18, events=POLLIN}, {fd=10, events=POLLIN|POLLPRI}, {fd=36, events=POLLIN}, {fd=19, events=POLLIN, revents=POLLIN}], 10, -1) = 1
read(19, "\372", 1)                     = 1
futex(0xac557c, 0x85 /* FUTEX_??? */, 1) = 1
read(3, 0xa9e6f4, 4096)                 = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=8, events=POLLIN|POLLPRI}, {fd=12, events=POLLIN|POLLPRI}, {fd=13, events=POLLIN|POLLPRI}, {fd=14, events=POLLIN|POLLPRI}, {fd=18, events=POLLIN}, {fd=10, events=POLLIN|POLLPRI}, {fd=36, events=POLLIN}, {fd=19, events=POLLIN}], 10, 0) = 0
select(4, [3], [3], NULL, NULL)         = 1 (out [3])
writev(3, [{"5\30\4\0\325@\0\3\0\1\0\3\21\0\21\0\227\4\5\0\326@\0\3"..., 2092}], 1) = 2092
read(3, 0xa9e6f4, 4096)                 = -1 EAGAIN (Resource temporarily unavailable)
read(3, 0xa9e6f4, 4096)                 = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=8, events=POLLIN|POLLPRI}, {fd=12, events=POLLIN|POLLPRI}, {fd=13, events=POLLIN|POLLPRI}, {fd=14, events=POLLIN|POLLPRI}, {fd=18, events=POLLIN}, {fd=10, events=POLLIN|POLLPRI}, {fd=36, events=POLLIN}, {fd=19, events=POLLIN}], 10, 0) = 0
read(3, 0xa9e6f4, 4096)                 = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=8, events=POLLIN|POLLPRI}, {fd=12, events=POLLIN|POLLPRI}, {fd=13, events=POLLIN|POLLPRI}, {fd=14, events=POLLIN|POLLPRI}, {fd=18, events=POLLIN}, {fd=10, events=POLLIN|POLLPRI}, {fd=36, events=POLLIN}, {fd=19, events=POLLIN, revents=POLLIN}], 10, -1) = 1
read(19, "\372", 1)                     = 1
futex(0xac557c, 0x85 /* FUTEX_??? */, 1) = 1
read(3, 0xa9e6f4, 4096)                 = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=8, events=POLLIN|POLLPRI}, {fd=12, events=POLLIN|POLLPRI}, {fd=13, events=POLLIN|POLLPRI}, {fd=14, events=POLLIN|POLLPRI}, {fd=18, events=POLLIN}, {fd=10, events=POLLIN|POLLPRI}, {fd=36, events=POLLIN}, {fd=19, events=POLLIN}], 10, 0) = 0
select(4, [3], [3], NULL, NULL)         = 1 (out [3])
writev(3, [{"5\30\4\0\334@\0\3\0\1\0\3\21\0\21\0\227\4\5\0\335@\0\3"..., 2092}], 1) = 2092
read(3, 0xa9e6f4, 4096)                 = -1 EAGAIN (Resource temporarily unavailable)
read(3, 0xa9e6f4, 4096)                 = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=8, events=POLLIN|POLLPRI}, {fd=12, events=POLLIN|POLLPRI}, {fd=13, events=POLLIN|POLLPRI}, {fd=14, events=POLLIN|POLLPRI}, {fd=18, events=POLLIN}, {fd=10, events=POLLIN|POLLPRI}, {fd=36, events=POLLIN}, {fd=19, events=POLLIN}], 10, 0) = 0
read(3, 0xa9e6f4, 4096)                 = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=8, events=POLLIN|POLLPRI}, {fd=12, events=POLLIN|POLLPRI}, {fd=13, events=POLLIN|POLLPRI}, {fd=14, events=POLLIN|POLLPRI}, {fd=18, events=POLLIN}, {fd=10, events=POLLIN|POLLPRI}, {fd=36, events=POLLIN}, {fd=19, events=POLLIN, revents=POLLIN}], 10, -1) = 1
read(19, "\372", 1)                     = 1
futex(0xac557c, 0x85 /* FUTEX_??? */, 1) = 1
read(3, 0xa9e6f4, 4096)                 = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=8, events=POLLIN|POLLPRI}, {fd=12, events=POLLIN|POLLPRI}, {fd=13, events=POLLIN|POLLPRI}, {fd=14, events=POLLIN|POLLPRI}, {fd=18, events=POLLIN}, {fd=10, events=POLLIN|POLLPRI}, {fd=36, events=POLLIN}, {fd=19, events=POLLIN}], 10, 0) = 0
select(4, [3], [3], NULL, NULL)         = 1 (out [3])
writev(3, [{"5\30\4\0\343@\0\3\0\1\0\3\21\0\21\0\227\4\5\0\344@\0\3"..., 2092}], 1) = 2092
read(3, 0xa9e6f4, 4096)                 = -1 EAGAIN (Resource temporarily unavailable)
read(3, 0xa9e6f4, 4096)                 = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=8, events=POLLIN|POLLPRI}, {fd=12, events=POLLIN|POLLPRI}, {fd=13, events=POLLIN|POLLPRI}, {fd=14, events=POLLIN|POLLPRI}, {fd=18, events=POLLIN}, {fd=10, events=POLLIN|POLLPRI}, {fd=36, events=POLLIN}, {fd=19, events=POLLIN}], 10, 0) = 0
read(3, 0xa9e6f4, 4096)                 = -1 EAGAIN (Resource temporarily unavailable)
poll( <unfinished ...>

Anyone else seen something like this? Not sure what 'EAGAIN' really means for a read() call.

Any thoughts are appreciated.

Thanks,

-Mark

[mlissner]

I responded to your other version of this thread, here: http://ubuntuforums.org/showthread.php?t=959474