Messages in this thread | | | From | Saravana Kannan <> | Date | Wed, 28 Apr 2021 10:27:46 -0700 | Subject | Re: Sleeping in atomic context on device release due to device links |
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On Mon, Apr 26, 2021 at 10:08 AM Andy Shevchenko <andy.shevchenko@gmail.com> wrote: > > Hi! > > Is the below already fixed somewhere (v5.12 seems still has it)? > Or I missed something? > > [ 186.439095] BUG: sleeping function called from invalid context at > drivers/gpio/gpiolib.c:1952 > [ 186.451666] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: > 119, name: kworker/0:2 > [ 186.463885] 2 locks held by kworker/0:2/119: > [ 186.470831] #0: ffff985d8110d338 > ((wq_completion)rcu_gp){....}-{0:0}, at: process_one_work+0x1bc/0x4b0 > [ 186.484458] #1: ffffb1a2c0367e70 > ((work_completion)(&sdp->work)){....}-{0:0}, at: > process_one_work+0x1bc/0x4b > 0 > [ 186.498732] CPU: 0 PID: 119 Comm: kworker/0:2 Not tainted 5.12.0-rc8+ #168 > [ 186.508301] Hardware name: Intel Corporation Merrifield/BODEGA BAY, > BIOS 542 2015.01.21:18.19.48 > [ 186.521000] Workqueue: rcu_gp srcu_invoke_callbacks > [ 186.528515] Call Trace: > [ 186.532288] dump_stack+0x69/0x8e > [ 186.536964] ___might_sleep.cold+0x95/0xa2 > [ 186.543606] gpiod_free_commit+0x25/0x170 > [ 186.550163] gpiod_put+0x19/0x40 > [ 186.554728] cleanup+0x1b/0x30 [spi_pxa2xx_platform] > [ 186.562246] spidev_release+0x24/0x50 > [ 186.567243] device_release+0x34/0x90 > [ 186.572228] kobject_put+0x86/0x1d0 > [ 186.577035] __device_link_free_srcu+0x47/0x70 > [ 186.583942] srcu_invoke_callbacks+0xc8/0x170
Hi Rafael,
So it looks like put_device() is not guaranteed to be atomic and srcu_invoke_callbacks() runs in atomic context. I haven't dug into why the SRCU implementation is needed for device links and what needs to be in the srcu callback vs be done earlier in the actual caller context.
Can you please look into this and give your thoughts?
-Saravana
> [ 186.590720] process_one_work+0x24d/0x4b0 > [ 186.597118] worker_thread+0x55/0x3c0 > [ 186.602030] ? rescuer_thread+0x390/0x390 > [ 186.608373] kthread+0x137/0x150 > [ 186.612834] ? __kthread_bind_mask+0x60/0x60 > [ 186.619446] ret_from_fork+0x22/0x30 > > > -- > With Best Regards, > Andy Shevchenko
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