On 01/05/2015 12:46 PM, François Valenduc wrote:
Le 05/01/15 18:25, Larry Finger a écrit :
On 01/05/2015 01:12 AM, François Valenduc wrote:
Hello everybody,
Since kernel 3.18, I encounter a kernel crash each time when I copy a
big file (around 12 Gb) from an external USB drive to the harddrive of
my laptop.
I tried a bisection between kernels 3.17 and 3.18 and I was surprised to
find that this has to do with the driver of the wireless card
(rtl8188ee). However, I don't have problems if I copy the file while the
rtl8188 module is not loaded. Unfortunately, the results of git-bisect
are not totally conclusive because the kernel crash during boot when the
wireless connection is established. Here are the last steps of the
bisection:
# bad: [c151aed6aa146e9587590051aba9da68b9370f9b] rtlwifi: rtl8188ee:
Update driver to match Realtek release of 06282014
git bisect bad c151aed6aa146e9587590051aba9da68b9370f9b
# good: [fd09ff958777cf583d7541f180991c0fc50bd2f7] rtlwifi: Remove extra
workqueue for enter/leave power state
git bisect good fd09ff958777cf583d7541f180991c0fc50bd2f7
# skip: [9afa2e44f4d8f9d031f815c32bb8f225f0f6746b] rtlwifi: Modify
base.{c,h} for new drivers
git bisect skip 9afa2e44f4d8f9d031f815c32bb8f225f0f6746b
# skip: [3c67b8f9f3b5bb1207c9bb198e5ef04ff56921dd] rtlwifi: Modify
cam.{c,h} and efuse.{c,h} for new drivers
git bisect skip 3c67b8f9f3b5bb1207c9bb198e5ef04ff56921dd
# skip: [f7953b2ad66cc5fc66e13d5c0a40e61b45cdfca8] rtlwifi: Modify
core.c for new drivers
git bisect skip f7953b2ad66cc5fc66e13d5c0a40e61b45cdfca8
# skip: [d3feae41a3473a0f7b431d6af4e092865d586e52] rtlwifi: Update
power-save routines for 062814 driver
git bisect skip d3feae41a3473a0f7b431d6af4e092865d586e52
# skip: [38506ecefab911785d5e1aa5889f6eeb462e0954] rtlwifi: rtl_pci:
Start modification for new drivers
git bisect skip 38506ecefab911785d5e1aa5889f6eeb462e0954
# skip: [f3a97e93814aeac3f13e857a0071726acc9bd626] rtlwifi: Finish
modifying core routines for new drivers
git bisect skip f3a97e93814aeac3f13e857a0071726acc9bd626
# only skipped commits left to test
# possible first bad commit: [c151aed6aa146e9587590051aba9da68b9370f9b]
rtlwifi: rtl8188ee: Update driver to match Realtek release of 06282014
# possible first bad commit: [f3a97e93814aeac3f13e857a0071726acc9bd626]
rtlwifi: Finish modifying core routines for new drivers
# possible first bad commit: [d3feae41a3473a0f7b431d6af4e092865d586e52]
rtlwifi: Update power-save routines for 062814 driver
# possible first bad commit: [3c67b8f9f3b5bb1207c9bb198e5ef04ff56921dd]
rtlwifi: Modify cam.{c,h} and efuse.{c,h} for new drivers
# possible first bad commit: [9afa2e44f4d8f9d031f815c32bb8f225f0f6746b]
rtlwifi: Modify base.{c,h} for new drivers
# possible first bad commit: [f7953b2ad66cc5fc66e13d5c0a40e61b45cdfca8]
rtlwifi: Modify core.c for new drivers
# possible first bad commit: [38506ecefab911785d5e1aa5889f6eeb462e0954]
rtlwifi: rtl_pci: Start modification for new drivers
Can somebody explain what's happening ? I do the copy via Dolphin in KDE
and the screen becomes black and the computer becomes totally
unresponsive. So, I don't have access to the logs to see the trace of
the problem.
Thanks in advance for your help,
There is a bug in 3.18 that is triggered when an O(3) memory
allocation fails. There is a patch to fix this at
http://marc.info/?l=linux-netdev&m=141999680927473&w=2 that has been
merged into wireless-drivers as commit
e9538cf4f90713eca71b1d6a74b4eae1d445c664. It will be applied to 3.18.X
when it makes it into mainline 3.19-rcY, but that has not yet happened.
You could manually apply that patch to your kernel source, or you
could pull the git repo at http://github.com/lwfinger/rtlwifi_new.git.
That code has this patch already applied.
If this patch does not fix the problem, you might be able to capture
at least part of the backtrace by starting the transfer and then
switching to the logging console. When a crash happens, photograph the
screen. On my system, I display it with CTRL-ALT-F10. I return to the
normal graphical console with CTRL-ALT-F7, but your distro may use
different virtual consoles.
Larry
Thanks for your help, it seems that your patch solves the problem. Now,
the system doesn't crash anymore after copying the same large file than
yesterday. I also see this message in the log:
rtl_pci: Allocation of new skb failed in _rtl_pci_rx_interrupt which is
added by your patch.
Should I worry about this failure ? Or is it expected ?
That is the positive proof that the new patch worked. Getting to that condition
without the patch would have crashed the system. That printk is there to see if
we were actually getting the condition and recovering. As the code is obviously
working now, that line will be removed soon.
Thanks,
Larry
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