diff options
author | John Stultz <jstultz@google.com> | 2024-11-14 11:00:47 -0800 |
---|---|---|
committer | Peter Zijlstra <peterz@infradead.org> | 2024-12-02 12:01:29 +0100 |
commit | 82f9cc094975240885c93effbca7f4603f5de1bf (patch) | |
tree | 14e03942067d2c618ea37006cccf8a6ec06fefc3 /drivers/iio/accel/adxl313_core.c | |
parent | 0664e2c311b9fa43b33e3e81429cd0c2d7f9c638 (diff) |
locking: rtmutex: Fix wake_q logic in task_blocks_on_rt_mutex
Anders had bisected a crash using PREEMPT_RT with linux-next and
isolated it down to commit 894d1b3db41c ("locking/mutex: Remove
wakeups from under mutex::wait_lock"), where it seemed the
wake_q structure was somehow getting corrupted causing a null
pointer traversal.
I was able to easily repoduce this with PREEMPT_RT and managed
to isolate down that through various call stacks we were
actually calling wake_up_q() twice on the same wake_q.
I found that in the problematic commit, I had added the
wake_up_q() call in task_blocks_on_rt_mutex() around
__ww_mutex_add_waiter(), following a similar pattern in
__mutex_lock_common().
However, its just wrong. We haven't dropped the lock->wait_lock,
so its contrary to the point of the original patch. And it
didn't match the __mutex_lock_common() logic of re-initializing
the wake_q after calling it midway in the stack.
Looking at it now, the wake_up_q() call is incorrect and should
just be removed. So drop the erronious logic I had added.
Fixes: 894d1b3db41c ("locking/mutex: Remove wakeups from under mutex::wait_lock")
Closes: https://lore.kernel.org/lkml/6afb936f-17c7-43fa-90e0-b9e780866097@app.fastmail.com/
Reported-by: Anders Roxell <anders.roxell@linaro.org>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: John Stultz <jstultz@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Juri Lelli <juri.lelli@redhat.com>
Tested-by: Anders Roxell <anders.roxell@linaro.org>
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Link: https://lore.kernel.org/r/20241114190051.552665-1-jstultz@google.com
Diffstat (limited to 'drivers/iio/accel/adxl313_core.c')
0 files changed, 0 insertions, 0 deletions