diff options
author | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-08-03 10:30:05 +0100 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-11 18:35:20 -0700 |
commit | 17ef32956a8481fba02751e14c17c648c9f472e6 (patch) | |
tree | 00c310cc365a68606015400ca0927ab53e1fa8a3 /arch/arm/include | |
parent | 75bc4446e0d553aceeb632ae05878786d6760e47 (diff) |
ARM: fix a cockup in 48be69a02 (ARM: move signal handlers into a vdso-like page)
commit e0d407564b532d978b03ceccebd224a05d02f111 upstream.
Unfortunately, I never committed the fix to a nasty oops which can
occur as a result of that commit:
------------[ cut here ]------------
kernel BUG at /home/olof/work/batch/include/linux/mm.h:414!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 PID: 490 Comm: killall5 Not tainted 3.11.0-rc3-00288-gabe0308 #53
task: e90acac0 ti: e9be8000 task.ti: e9be8000
PC is at special_mapping_fault+0xa4/0xc4
LR is at __do_fault+0x68/0x48c
This doesn't show up unless you do quite a bit of testing; a simple
boot test does not do this, so all my nightly tests were passing fine.
The reason for this is that install_special_mapping() expects the
page array to stick around, and as this was only inserting one page
which was stored on the kernel stack, that's why this was blowing up.
Reported-by: Olof Johansson <olof@lixom.net>
Tested-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm/include')
0 files changed, 0 insertions, 0 deletions