[Bug 25832] kernel crashes upon resume if usb devices are removed when suspended

https://bugzilla.kernel.org/show_bug.cgi?id=25832

--- Comment #26 from rocko <rockorequin@hotmail.com>  2011-02-07 04:24:49 ---

The kernel panic messages (when kmsg gets that far) do say that a fatal
exception has happened in an interrupt. It seems odd to me though that
kmsg_dump locks up a seemingly random time later while reporting the panic.

I tried again with two vfat USB drives, one ext3 external drive, and an ntfs
external drive attached via the hub. I reproduced the freeze, this time caused
by a null pointer reference error rather than a unhandled page fault error.
Again it was in task_rq_lock. The stack trace stopped very abruptly this time. 

I'm not positive that this lets ext4 completely off the hook because of the
crash that was caused when firefox tried to access the internal ext4 home
partition. Presumably I'd have to try and reproduce the problem with all the
internal partitions reformatted to ext3 to rule out ext4 completely.

But perhaps ext4's memory was corrupted by the umount operations? Is there
common umount kernel code shared by all file systems?

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