2.5.8-pre2: preempt: exits with preempt_count 1
My system (x86 K6 UP running 2.5.8-pre2 with preemption) on powering down gave:
...
Power down.
error: halt[411] exited with preempt_count 1
This was after about 24 hours of up time. What can I do to help track down this locking problem?
All the best,
Duncan.
Quoted 4 lines · Duncan Sands
error: halt[411] exited with
preempt_count1This was after about 24 hours of up time. What can I do to help track down this locking problem?
It is not a big deal. The issue is that in the system shutdown code, something does not release a lock but just figures "the system is going down, what is the point?" It is probably the BKL ...
For the sake of code readability and having nothing quit with a nonzero preempt_count, we should explicitly drop the lock, but it is not hurting anything (now, if you get this message elsewhere, there may be a problem).
I am trying to find what is the cause but I have not tracked it down yet
...
Robert Love
Quoted 11 lines · Robert Love
Quoted 4 lines · Duncan Sands
error: halt[411] exited with
preempt_count1This was after about 24 hours of up time. What can I do to help track down this locking problem?
It is not a big deal. The issue is that in the system shutdown code, something does not release a lock but just figures "the system is going down, what is the point?" It is probably the BKL ...
Quoted 6 lines
For the sake of code readability and having nothing quit with a nonzero
preempt_count, we should explicitly drop the lock, but it is not hurting anything (now, if you get this message elsewhere, there may be a problem).I am trying to find what is the cause but I have not tracked it down yet
This is also still happening on 2.4.19-pre6 + preempt
Quoted 15 lines
...
Robert Love
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Quoted 8 lines · Duncan Sands
My system (x86 K6 UP running 2.5.8-pre2 with preemption) on powering down gave:
...
Power down.
error: halt[411] exited withpreempt_count1This was after about 24 hours of up time. What can I do to help track down this locking problem?
If you fixed the oopsing 2.5.8-pre1 kernel by putting 'lock_kernel()' in exit.c, then you have to remove that line.
The correct fix was applied later, and if you leave in the call to 'lock_kernel()' you get the exact message you're reporting.
If line 505 of kernel/exit.c is lock_kernel() in your tree then delete it, and try again.
Signature · 1 line
Skip
Quoted 7 lines · Robert Love
Quoted 4 lines · Duncan Sands
error: halt[411] exited with
preempt_count1This was after about 24 hours of up time. What can I do to help track down this locking problem?
Quoted 2 lines · Duncan Sands
UP x86 K6 system running 2.5.8-pre3 with preemption. Using usb-uhci. I got the following bug when powering off:
It looks like one problem, caused by some usb device driver not exiting cleanly.
Pierre
Signature · 3 lines
------------------------------------------------ Pierre Rousselet <[email protected]> ------------------------------------------------
Quoted 10 lines · Skip Ford
Quoted 8 lines · Duncan Sands
My system (x86 K6 UP running 2.5.8-pre2 with preemption) on powering down gave:
...
Power down.
error: halt[411] exited withpreempt_count1This was after about 24 hours of up time. What can I do to help track down this locking problem?
Quoted 8 lines
If you fixed the oopsing 2.5.8-pre1 kernel by putting '
lock_kernel()' inexit.c, then you have to remove that line.The correct fix was applied later, and if you leave in the call to '
lock_kernel()' you get the exact message you're reporting.If line 505 of
kernel/exit.cislock_kernel()in your tree then delete it, and try again.
No, it wasn't that, but thanks for thinking about it.
Ciao, Duncan.
Quoted 7 lines · Pierre Rousselet
Quoted 5 lines · Robert Love
Quoted 4 lines · Duncan Sands
error: halt[411] exited with
preempt_count1This was after about 24 hours of up time. What can I do to help track down this locking problem?
Quoted 6 lines
Quoted 2 lines · Duncan Sands
UP x86 K6 system running 2.5.8-pre3 with preemption. Using usb-uhci. I got the following bug when powering off:
It looks like one problem, caused by some usb device driver not exiting cleanly.
Probably. There was no BUG with 2.5.8-pre2 though.
Duncan.
Quoted 7 lines · * Robert Love ([email protected]) wrote:
Quoted 4 lines · Duncan Sands
error: halt[411] exited with
preempt_count1This was after about 24 hours of up time. What can I do to help track down this locking problem?
Quoted 8 lines
It is not a big deal. The issue is that in the system shutdown code, something does not release a lock but just figures "the system is going down, what is the point?" It is probably the BKL ...
For the sake of code readability and having nothing quit with a nonzero
preempt_count, we should explicitly drop the lock, but it is not hurting anything (now, if you get this message elsewhere, there may be a problem).
ditto with nfs. doesn't require a system shutdown, just stopping the nfs server.
error: nfsd[983] exited with preempt_count 1
error: rpciod[994] exited with preempt_count 1
error: lockd[993] exited with preempt_count 1
cheers,
-chris