Intel "em" driver sleeps with non-sleepable lock.

[Jack Vogel]

So, this happens EVERY time after an install of 8.2 ??

Give me details about the hardware please.

Jack


On Thu, May 5, 2011 at 11:11 AM, Zaphod Beeblebrox <zbeeble at gmail.com>wrote:

> The motherboard in question is made by Intel and contains a Xeon 3440
> (4 core x 2 HT per core).  16 Gig of RAM is installed and we are
> installing the 64 bit FreeBSD 8.2 using the PC-BSD installer (to
> install zfs root faster).  The motherboard has 4 "igb" ethernet and
> one "em" ethernet.  The "em" ethernet is shared with an internal
> "RMM3" remote management card and/or the onboard ILOM.  This error
> happens when rebooting after installation and is repeatable with at
> least FreeBSD 8.1 and FreeBSD 8.2.
>
> The last boot message is "Starting devd" ... so I assume that the
> active link on em0 might be making devd start dhclient.  After this
> last boot message, the screen reads:
>
> Sleeping thread (tid 100195, pid 619) owns a non-sleepable lock
> panic: sleeping thread
> cpuid = 2
> KDB: stack backtrace:
> #0 0xffffffff805f4e03 at kdb_backtrace+0x5e
> #1 0xffffffff805c2d07 at panic+0x187
> #2 0xffffffff80601a5d at propagate_priority+0x1cd
> #3 0xffffffff8060278a at turnstile_wait+0x1aa
> #4 0xffffffff805b34c0 at _mtx_lock_sleep+0xb0
> #5 0xffffffff8032fd97 at em_init_locked+0xce7
> #6 0xffffffff80331b8e at em_ioctl+0x5fe
> #7 0xffffffff80671114 at ifioctl+0x9e4
> #8 0xffffffff806043c2 at kern_ioctl+0x102
> #9 0xffffffff806045fd at ioctl+0xfd
> #10 0xffffffffff80600dd5 at syscallenter+0x1e5
> #11 0xffffffffff808aca5b at syscall+0x4b
> #12 0xffffffffff80895292 at Xfast_syscall+0xe2
>
> Now. I assume that booting without link on em0 (inconvenient) or
> booting without "em" in the kernel will fix things.  I'll be checking
> this out shortly.
>
> I can provide (for a limited time) full console access and/or I can
> test code if someone sees a patch for this.
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