From: Sasha Levin <sashal@kernel.org>
To: John Stultz <john.stultz@linaro.org>
Cc: stable@vger.kernel.org, Fei Yang <fei.yang@intel.com>,
Sam Protsenko <semen.protsenko@linaro.org>,
Felipe Balbi <balbi@kernel.org>, Jack Pham <jackp@codeaurora.org>,
linux-usb@vger.kernel.org
Subject: Re: [PATCH 4.19.y v2 0/9] Fix scheduling while atomic in dwc3_gadget_ep_dequeue
Date: Fri, 28 Jun 2019 18:58:03 -0400 [thread overview]
Message-ID: <20190628225803.GK11506@sasha-vm> (raw)
In-Reply-To: <20190628182413.33225-1-john.stultz@linaro.org>
On Fri, Jun 28, 2019 at 06:24:04PM +0000, John Stultz wrote:
>With recent changes in AOSP, adb is using asynchronous io, which
>causes the following crash usually on a reboot:
>
>[ 184.278302] BUG: scheduling while atomic: ksoftirqd/0/9/0x00000104
>[ 184.284617] Modules linked in: wl18xx wlcore snd_soc_hdmi_codec wlcore_sdio tcpci_rt1711h tcpci tcpm typec adv7511 cec dwc3 phy_hi3660_usb3 snd_soc_simple_card snd_soc_a
>[ 184.316034] Preemption disabled at:
>[ 184.316072] [<ffffff8008081de4>] __do_softirq+0x64/0x398
>[ 184.324953] CPU: 0 PID: 9 Comm: ksoftirqd/0 Tainted: G S 4.19.43-00669-g8e4970572c43-dirty #356
>[ 184.334963] Hardware name: HiKey960 (DT)
>[ 184.338892] Call trace:
>[ 184.341352] dump_backtrace+0x0/0x158
>[ 184.345025] show_stack+0x14/0x20
>[ 184.348355] dump_stack+0x80/0xa4
>[ 184.351685] __schedule_bug+0x6c/0xc0
>[ 184.355363] __schedule+0x64c/0x978
>[ 184.358863] schedule+0x2c/0x90
>[ 184.362053] dwc3_gadget_ep_dequeue+0x274/0x388 [dwc3]
>[ 184.367210] usb_ep_dequeue+0x24/0xf8
>[ 184.370884] ffs_aio_cancel+0x3c/0x80
>[ 184.374561] free_ioctx_users+0x40/0x148
>[ 184.378500] percpu_ref_switch_to_atomic_rcu+0x180/0x1c0
>[ 184.383830] rcu_process_callbacks+0x24c/0x5d8
>[ 184.388283] __do_softirq+0x13c/0x398
>[ 184.391959] run_ksoftirqd+0x3c/0x48
>[ 184.395549] smpboot_thread_fn+0x220/0x288
>[ 184.399660] kthread+0x12c/0x130
>[ 184.402901] ret_from_fork+0x10/0x1c
>
>
>This happens as usb_ep_dequeue can be called in interrupt
>context, and dwc3_gadget_ep_dequeue() then calls
>wait_event_lock_irq() which can sleep.
>
>Upstream kernels are not affected due to the change
>fec9095bdef4 ("dwc3: gadget: remove wait_end_transfer") which
>removes the wait_even_lock_irq code. Unfortunately that change
>has a number of dependencies, which I'm submitting here.
>
>Also, to match upstream, in this series I've reverted one
>change that was backported to -stable, to replace it with the
>cherry-picked upstream commit (as the dependencies are now
>there)
>
>This issue also affects 4.14,4.9 and I believe 4.4 kernels,
>however I don't know how to best backport this functionality
>that far back. Help from the maintainers would be very much
>appreciated!
>
>
>New in v2:
>* Reordered the patchset to put the revert patch first, which
> avoids any bisection build issues. (Thanks to Jack Pham for
> the suggestion!)
>
>
>Feedback and comments would be welcome!
I've queued it up for 4.19.
Is it the case that for older kernels the dependency list is too long?
--
Thanks,
Sasha
next prev parent reply other threads:[~2019-06-28 22:58 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-28 18:24 [PATCH 4.19.y v2 0/9] Fix scheduling while atomic in dwc3_gadget_ep_dequeue John Stultz
2019-06-28 18:24 ` [PATCH 4.19.y v2 1/9] Revert "usb: dwc3: gadget: Clear req->needs_extra_trb flag on cleanup" John Stultz
2019-06-28 18:24 ` [PATCH 4.19.y v2 2/9] usb: dwc3: gadget: combine unaligned and zero flags John Stultz
2019-06-28 18:24 ` [PATCH 4.19.y v2 3/9] usb: dwc3: gadget: track number of TRBs per request John Stultz
2019-06-28 18:24 ` [PATCH 4.19.y v2 4/9] usb: dwc3: gadget: use num_trbs when skipping TRBs on ->dequeue() John Stultz
2019-06-28 18:24 ` [PATCH 4.19.y v2 5/9] usb: dwc3: gadget: extract dwc3_gadget_ep_skip_trbs() John Stultz
2019-06-28 18:24 ` [PATCH 4.19.y v2 6/9] usb: dwc3: gadget: introduce cancelled_list John Stultz
2019-06-28 18:24 ` [PATCH 4.19.y v2 7/9] usb: dwc3: gadget: move requests to cancelled_list John Stultz
2019-06-28 18:24 ` [PATCH 4.19.y v2 8/9] usb: dwc3: gadget: remove wait_end_transfer John Stultz
2019-06-28 18:24 ` [PATCH 4.19.y v2 9/9] usb: dwc3: gadget: Clear req->needs_extra_trb flag on cleanup John Stultz
2019-06-28 22:58 ` Sasha Levin [this message]
2019-06-28 23:03 ` [PATCH 4.19.y v2 0/9] Fix scheduling while atomic in dwc3_gadget_ep_dequeue John Stultz
2019-07-01 23:36 ` Thinh Nguyen
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