[RESEND BUG REPORT] System hung! Due to ftrace or KASAN?
From: Zenghui Yu
Date: Fri Jan 18 2019 - 12:45:48 EST
I compiled the latest kernel and installed it on my old laptop (Hardware name:
Hewlett-Packard HP ProBook 440 G2/2247, BIOS M74 Ver. 01.02 06/17/2014). But
when I tried to enable function tracer via debugfs, the system went _hung_!
Compared with the last kernel compiling process, the only change I have made
is that I enabled KASAN configuration this time.
Reproducing this issue is simple as below:
0. `uname -a` shows:
Linux ubuntuu 5.0.0-rc2+ #9 SMP Fri Jan 18 03:04:01 CST 2019
x86_64 x86_64 x86_64 GNU/Linux
1. `make menuconfig` to enable KASAN configuration:
Kernel hacking ---> Memory Debugging --->
KASAN: runtime memory debugger
compile, install, reboot, then `dmesg | grep kasan` shows:
[ 0.342882] kasan: KernelAddressSanitizer initialized
2. enable function tracer
`echo function > /sys/kernel/debug/tracing/current_tracer`
(then my poor laptop was locked and didn't respond to me ...)
What's more, enabling function graph tracer will suffer from the same problem.
I have no idea about what wrong thing had happened inside kernel --
or about KASAN? So I report it to you and waiting for your solution!
I have provided my *.config* file as attachment for those who're interested in
this issue. But sorry for that I can't provide any useful call trace
system went down so quickly.
P.S. I'm a newcomer for KASAN. If any mis-configuration or
fix me up and let me know :).
Description: Binary data