8000 UVC driver usually crashes Linux kernel if run multuiple times in a row · Issue #681 · ftctechnh/ftc_app · GitHub
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This repository was archived by the owner on Oct 27, 2020. It is now read-only.
This repository was archived by the owner on Oct 27, 2020. It is now read-only.
UVC driver usually crashes Linux kernel if run multuiple times in a row #681
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@Windwoes

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@Windwoes

Here's a folder with videos of all my tests

Title basically says it all.

Here's the syslog of the event:

[  967.760390] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[  967.760452] pgd = e8e38000
[  967.760548] [00000000] *pgd=00000000
[  967.760656] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[  967.760711] CPU: 0    Not tainted  (3.4.0-g853158b #1)
[  967.760810] PC is at xhci_free_segments_for_ring+0x2c/0x88
[  967.760866] LR is at xhci_free_segments_for_ring+0x54/0x88
[  967.760964] pc : [<c0623f24>]    lr : [<c0623f4c>]    psr: a0000093
[  967.760967] sp : e83e7c18  ip : 60000093  fp : e83e7c3c
[  967.761109] r10: 00000000  r9 : 00000001  r8 : 00000000
[  967.761162] r7 : e9942000  r6 : e845f940  r5 : 00000000  r4 : 00000000
[  967.761255] r3 : 00000001  r2 : c1131c8c  r1 : 012bf000  r0 : ee002180
[  967.761353] Flags: NzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
[  967.761409] Control: 10c5787d  Table: 3123806a  DAC: 00000015

It traces back to:

#18 pc 0001da97  /data/app/com.qualcomm.ftcrobotcontroller-2/lib/arm/libRobotCore.so (_Z22uvc_user_callback_mainP17uvc_stream_handle+274)

Also, I did a hotplug recovery test (this time using ZTEs since I figured the Tech Team would have verified it worked with those) and it FAILED all 3 tests I did.

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