diff options
| author | Ani Sinha <[email protected]> | 2015-12-17 17:15:10 -0800 |
|---|---|---|
| committer | Paul E. McKenney <[email protected]> | 2015-12-29 16:29:18 -0800 |
| commit | 984cf355aeaa8f2eda3861b50d0e8d3e3f77e83b (patch) | |
| tree | f768f851c8eb20e10537f3c47216547b8b116162 /tools/perf/util/trace-event-scripting.c | |
| parent | 648c630c642a4869c7fc30345880675020298852 (diff) | |
sysrq: Fix warning in sysrq generated crash.
Commit 984d74a72076a1 ("sysrq: rcu-ify __handle_sysrq") replaced
spin_lock_irqsave() calls with rcu_read_lock() calls in sysrq. Since
rcu_read_lock() does not disable preemption, faulthandler_disabled() in
__do_page_fault() in x86/fault.c returns false. When the code later calls
might_sleep() in the pagefault handler, we get the following warning:
BUG: sleeping function called from invalid context at ../arch/x86/mm/fault.c:1187
in_atomic(): 0, irqs_disabled(): 0, pid: 4706, name: bash
Preemption disabled at:[<ffffffff81484339>] printk+0x48/0x4a
To fix this, we release the RCU read lock before we crash.
Tested this patch on linux 3.18 by booting off one of our boards.
Fixes: 984d74a72076a1 ("sysrq: rcu-ify __handle_sysrq")
Signed-off-by: Ani Sinha <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Diffstat (limited to 'tools/perf/util/trace-event-scripting.c')
0 files changed, 0 insertions, 0 deletions