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| author | Jann Horn <jannh@google.com> | 2020-03-05 23:06:57 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-06-22 09:05:14 +0200 |
| commit | fb020dcd627544e71a34cea6e117ff1a5a0d73c2 (patch) | |
| tree | 13fe10752750894ee124df0df815604ec66f2655 /kernel/sched | |
| parent | 831900a329849d1d78a90790567d50301ce1182f (diff) | |
exit: Move preemption fixup up, move blocking operations down
[ Upstream commit 586b58cac8b4683eb58a1446fbc399de18974e40 ]
With CONFIG_DEBUG_ATOMIC_SLEEP=y and CONFIG_CGROUPS=y, kernel oopses in
non-preemptible context look untidy; after the main oops, the kernel prints
a "sleeping function called from invalid context" report because
exit_signals() -> cgroup_threadgroup_change_begin() -> percpu_down_read()
can sleep, and that happens before the preempt_count_set(PREEMPT_ENABLED)
fixup.
It looks like the same thing applies to profile_task_exit() and
kcov_task_exit().
Fix it by moving the preemption fixup up and the calls to
profile_task_exit() and kcov_task_exit() down.
Fixes: 1dc0fffc48af ("sched/core: Robustify preemption leak checks")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200305220657.46800-1-jannh@google.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel/sched')
0 files changed, 0 insertions, 0 deletions