https://github.com/torvalds/linux
Revision e9dd685ce81815811fb4da72e6ab10a694ac8468 authored by Steven Rostedt on 27 May 2014, 21:02:04 UTC, committed by Ingo Molnar on 05 June 2014, 09:07:41 UTC
As Peter Zijlstra told me, we have the following path:
do_exit()
exit_itimers()
itimer_delete()
spin_lock_irqsave(&timer->it_lock, &flags);
timer_delete_hook(timer);
kc->timer_del(timer) := posix_cpu_timer_del()
put_task_struct()
__put_task_struct()
task_numa_free()
spin_lock(&grp->lock);
Which means that task_numa_free() can be called with interrupts
disabled, which means that we should not be using spin_lock_irq() but
spin_lock_irqsave() instead. Otherwise we are enabling interrupts while
holding an interrupt unsafe lock!
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner<tglx@linutronix.de>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20140527182541.GH11096@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
1 parent 6acbfb9
Tip revision: e9dd685ce81815811fb4da72e6ab10a694ac8468 authored by Steven Rostedt on 27 May 2014, 21:02:04 UTC
sched/numa: Fix use of spin_{un}lock_irq() when interrupts are disabled
sched/numa: Fix use of spin_{un}lock_irq() when interrupts are disabled
Tip revision: e9dd685
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| crypto | ||
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| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
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| security | ||
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| .gitignore | -rw-r--r-- | 1.1 KB |
| .mailmap | -rw-r--r-- | 4.4 KB |
| COPYING | -rw-r--r-- | 18.3 KB |
| CREDITS | -rw-r--r-- | 93.6 KB |
| Kbuild | -rw-r--r-- | 2.5 KB |
| Kconfig | -rw-r--r-- | 252 bytes |
| MAINTAINERS | -rw-r--r-- | 271.4 KB |
| Makefile | -rw-r--r-- | 50.5 KB |
| README | -rw-r--r-- | 18.3 KB |
| REPORTING-BUGS | -rw-r--r-- | 7.3 KB |
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