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SubjectFull lockup when compiling kernel with "optimal" number of threads
Hi,

I can reliably reproduce a complete machine lockup when compiling
kernel sources with "make -j". After making some progress machine
stops responding to anything (including CapsLock/NumLock switching or
mouse moving) and after hard reboot nothing is left in kern.log or
syslog. Only attaching a serial console gives me the following clues
to what happens:

[ 376.460584] INFO: task cc1:6839 blocked for more than 60 seconds.
[ 376.533411] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 376.627129] INFO: task cc1:6840 blocked for more than 60 seconds.
[ 376.699991] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 376.793636] INFO: task cc1:6850 blocked for more than 60 seconds.
[ 376.866397] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 376.960026] INFO: task cc1:7017 blocked for more than 60 seconds.
[ 377.032776] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 377.128156] INFO: task cc1:7079 blocked for more than 60 seconds.
[ 377.200907] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 377.294522] INFO: task cc1:7188 blocked for more than 60 seconds.
[ 377.367274] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 377.460984] INFO: task cc1:8342 blocked for more than 60 seconds.
[ 377.533746] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 377.627372] INFO: task cc1:8425 blocked for more than 60 seconds.
[ 377.700119] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 377.793737] INFO: task cc1:8502 blocked for more than 60 seconds.
[ 377.866488] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 377.960103] INFO: task cc1:8535 blocked for more than 60 seconds.
[ 378.034788] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
Interesting thing is that after such hang happens, I reboot the
machine and try to build again (this time with limited number of
threads) I get lots of "input/output errors" from make and messages
like the following in kern.log:

[ 186.518188] ecryptfs_decrypt_page: Error attempting to read lower
page; rc = [-4]
[ 186.522951] ecryptfs_decrypt_page: Error attempting to read lower
page; rc = [-4]
[ 186.522955] ecryptfs_readpage: Error decrypting page; rc = [-4]
[ 186.542690] Valid eCryptfs headers not found in file header region
or xattr region
[ 186.542694] Either the lower file is not in a valid eCryptfs
format, or the key could not be retrieved. Plaintext passthrough mode
is not enabled; returning -EIO

(As you can guess I'm building in my home directory which is ecryptfs.)

After that only doing "make distclean" allows me to compile kernel
again. And note that when I build with "make -j 10" everything works
fine (I have 2 CPUs with 4 cores each without hyper-threading).


So is it some bug or a known bad usage of ecryptfs?


Thank you,
Pavel


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