I have a task running that blocks pm-hibernate (on Linux 4.0.7-2). When I try pm-hibernate there is an error message "Freezing of tasks failed after 20.002 seconds (1 tasks refusing to freeze, wq_busy=0):" and the task is shown.
The process is a dead one that has been killed hours before. Why can root not just remove it from the kernel? I am feeling like under Windows!
I have seen related questions like How to kill a process which can't be killed without rebooting? but there do not seem to be satisfactory answers.
Some info (
31207 is the pid):
# cat /proc/31207/syscall 11 0x7fe482a47000 0x25fce 0x7fe481d4eb78 0x1 0x7fe482a6e700 0x25f2d30 0x7ffca8d8c278 0x7fe481a95ae7 # ps -l -p 31207 F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD 0 D 1001 31207 1 0 80 0 - 5035 lock_e pts/9 00:00:00 a.out # ps -lnp 31207 F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD 0 D 1001 31207 1 0 80 0 - 5035 ffffff pts/9 0:00 /tmp/a.out # ps opid,wchan:42,cmd -p 31207 PID WCHAN CMD 31207 lock_extent_bits /tmp/a.out
So, why can I not just stop it? To suspend it would suffice!
I am using no network FS and the task was a simple one accessing the network. If you can read this, the network is still up.