wrapfs is a stackable file system that intercepts file system calls and Tracefs basically records the VFS calls into a file on disk.
wrapfs worked fine its that when I added the logging functionality it failed.
The issue I am having is that When I run a workload on the mounted file system (wrapfs+tracefs) the system freezes. the mouse pointer does not even move.
I set it up in virtual box and had the kernel dump the messages to a serial port which I then read from my host OS. I did this following the instructions on this page:
http://linuxdeveloper.blogspot.com/2012/05/debugging-linux-kernel-over-serial-port.html
When the guest OS freezes I get the following messages seen below. I would like to know what is a good approach for debugging this issue. I am not sure what a process stall is. Is that a deadlock?
[ 780.357876] BUG: soft lockup - CPU#0 stuck for 22s! [nautilus:1382]
[ 780.361658] Process nautilus (pid: 1382, ti=dca12000 task=dc837230 task.ti=d)
[ 780.361658] Stack:
[ 780.361658] Call Trace:
[ 780.361658] Code: 90 b8 43 64 03 c1 b9 40 64 03 c1 e9 49 ff ff ff 90 55 ba 0
[ 808.356372] BUG: soft lockup - CPU#0 stuck for 22s! [nautilus:1382]
[ 808.360223] Process nautilus (pid: 1382, ti=dca12000 task=dc837230 task.ti=d)
[ 808.360223] Stack:
[ 808.360223] Call Trace:
[ 808.360223] Code: ff ff 90 b8 43 64 03 c1 b9 40 64 03 c1 e9 49 ff ff ff 90 5
[ 814.876223] INFO: rcu_sched detected stall on CPU 0 (t=15000 jiffies)
[ 814.876223] Process nautilus (pid: 1382, ti=dca12000 task=dc837230 task.ti=d)
[ 814.876223] Stack:
[ 814.876223] Call Trace:
[ 814.876223] Code: 00 c3 ff ff 80 e5 10 75 ee c1 e6 18 89 b0 10 c3 ff ff 89 d
Thanks.
Salam
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