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PROCESSOR-SDK-AM335X: Kernel crash when USB flash drive (GPT style FAT formatted) is inserted

Fariya Fatima
Intellectual 810 points

Part Number: PROCESSOR-SDK-AM335X

Hi,

When I insert a GPT style FAT formatted USB flash drive it doesn't get detected and I get the below kernel crash at times during the USB flash removal time. The kernel I use is 4.9.31-gf9f6f0db2d (Arago). 

[  112.833987] ------------[ cut here ]------------

[  112.834049] WARNING: CPU: 0 PID: 113 at drivers/dma/cppi41.c:700 cppi41_stop_chan+0x260/0x350

[  112.834105] Modules linked in: wl12xx usb_storage scsi_mod usb_f_ecm g_ether usb_f_rndis u_ether libcomposite configfs arc4 wl18xx wlcore mac80211 cfg80211 musb_dsps musb_hdrc udc_core phy_am335x phy_generic usbcore phy_am335x_control usb_common ti_am335x_adc ecb pm33xx wkup_m3_ipc sha256_generic wkup_m3_rproc hmac remoteproc virtio virtio_ring md5 sha1_generic sha1_arm_neon sha1_arm omap_aes_driver pinmux_helper(O) ti_emif_sram crypto_engine omap_sham pruss_soc_bus omap_rng rng_core wlcore_sdio rtc_pcf85263(O) musb_am335x rtc_omap omap_wdt ti_am335x_tscadc sch_fq_codel [last unloaded: wl12xx]

[  112.834548] CPU: 0 PID: 113 Comm: kworker/0:3 Tainted: G           O    4.9.31-gf9f6f0db2d #7

[  112.834604] Hardware name: Generic AM33XX (Flattened Device Tree)

[  112.834958] Workqueue: usb_hub_wq hub_event [usbcore]

[  112.834999] Backtrace:

[  112.835060] [<c010b6c8>] (dump_backtrace) from [<c010b984>] (show_stack+0x18/0x1c)

[  112.835120]  r7:00000009 r6:00000000 r5:c09ceaf8 r4:00000000

[  112.835167] [<c010b96c>] (show_stack) from [<c03c6224>] (dump_stack+0x24/0x28)

[  112.835234] [<c03c6200>] (dump_stack) from [<c012b03c>] (__warn+0xe8/0x100)

[  112.835282] [<c012af54>] (__warn) from [<c012b10c>] (warn_slowpath_null+0x28/0x30)

[  112.835342]  r9:cd101000 r8:0000003c r7:00000001 r6:cb22d010 r5:cb22d018 r4:cb30c130

[  112.835404] [<c012b0e4>] (warn_slowpath_null) from [<c04599ac>] (cppi41_stop_chan+0x260/0x350)

[  112.835559] [<c045974c>] (cppi41_stop_chan) from [<bf127aa0>] (cppi41_dma_channel_abort+0x138/0x2a4 [musb_hdrc])

[  112.835628]  r9:bf12af8c r8:cc5aa010 r7:bf12afa0 r6:00000004 r5:00000000 r4:cc64c064

[  112.835753] [<bf127968>] (cppi41_dma_channel_abort [musb_hdrc]) from [<bf1200d4>] (musb_cleanup_urb+0x60/0x1e0 [musb_hdrc])

[  112.835824]  r10:cc64c064 r9:cc5aa010 r8:d0bcb410 r7:c0010280 r6:cb045d00 r5:00000080

[  112.835876]  r4:cc5aa4c8

[  112.835975] [<bf120074>] (musb_cleanup_urb [musb_hdrc]) from [<bf120968>] (musb_urb_dequeue+0x150/0x158 [musb_hdrc])

[  112.836043]  r10:00000001 r9:cb694480 r8:00000000 r7:c0010280 r6:cc5aa010 r5:a0060093

[  112.836095]  r4:cb045d00

[  112.836294] [<bf120818>] (musb_urb_dequeue [musb_hdrc]) from [<bf0c7a34>] (unlink1+0x34/0x14c [usbcore])

[  112.836363]  r10:cb2f8a00 r9:cb2f8a74 r8:cb289000 r7:ffffff94 r6:cb289000 r5:cc720000

[  112.836418]  r4:cb045d00 r3:bf120818

[  112.836675] [<bf0c7a00>] (unlink1 [usbcore]) from [<bf0c9e84>] (usb_hcd_flush_endpoint+0x144/0x184 [usbcore])

[  112.836744]  r9:cb2f8a74 r8:cb289000 r7:c9819e38 r6:c9819e50 r5:cc720000 r4:cb045d00

[  112.837024] [<bf0c9d40>] (usb_hcd_flush_endpoint [usbcore]) from [<bf0cceb0>] (usb_disable_endpoint+0x90/0x98 [usbcore])

[  112.837093]  r9:cb2f8a74 r8:00000000 r7:c99da400 r6:c99fb488 r5:c99da400 r4:c9819e38

[  112.837373] [<bf0cce20>] (usb_disable_endpoint [usbcore]) from [<bf0ccf04>] (usb_disable_interface+0x4c/0x5c [usbcore])

[  112.837437]  r5:00000002 r4:00000070

[  112.837694] [<bf0cceb8>] (usb_disable_interface [usbcore]) from [<bf0cf914>] (usb_unbind_interface+0x1fc/0x2b8 [usbcore])

[  112.837764]  r9:cb2f8a74 r8:cb2f8a20 r7:bf30ff70 r6:00000000 r5:cb2f8a54 r4:bf30ff70

[  112.837946] [<bf0cf718>] (usb_unbind_interface [usbcore]) from [<c0502d48>] (device_release_driver_internal+0x154/0x1e8)

[  112.838017]  r10:00000001 r9:cb2f8a74 r8:00000034 r7:bf30ff70 r6:00000000 r5:cb2f8a54

[  112.838069]  r4:cb2f8a20

[  112.838108] [<c0502bf4>] (device_release_driver_internal) from [<c0502df4>] (device_release_driver+0x18/0x1c)

[  112.838174]  r9:cb2f8a74 r8:cb2f8a28 r7:c0c86de0 r6:bf0e0a5c r5:cb2f8a20 r4:cb35ac2c

[  112.838235] [<c0502ddc>] (device_release_driver) from [<c0501cf4>] (bus_remove_device+0xe0/0x10c)

[  112.838299] [<c0501c14>] (bus_remove_device) from [<c04fea3c>] (device_del+0x1f0/0x304)

[  112.838358]  r7:c0c86de0 r6:c99da470 r5:cb2f8a20 r4:cb2f8a74

[  112.838513] [<c04fe84c>] (device_del) from [<bf0ccfbc>] (usb_disable_device+0xa8/0x1ec [usbcore])

[  112.838578]  r9:cb2f8e00 r8:cb2f8a00 r7:cb289000 r6:00000000 r5:00000001 r4:c99da400

[  112.838857] [<bf0ccf14>] (usb_disable_device [usbcore]) from [<bf0c3a18>] (usb_disconnect+0x78/0x24c [usbcore])

[  112.838925]  r9:cb2f8e00 r8:cb389600 r7:c99da4a4 r6:c99da470 r5:c99da400 r4:00000000

[  112.839200] [<bf0c39a0>] (usb_disconnect [usbcore]) from [<bf0c558c>] (hub_event+0x598/0x1118 [usbcore])

[  112.839266]  r10:00000001 r9:00000001 r8:cb39d8fc r7:00000000 r6:cb2bdc00 r5:00000001

[  112.839320]  r4:00000000 r3:cb389600

[  112.839473] [<bf0c4ff4>] (hub_event [usbcore]) from [<c0141eb4>] (process_one_work+0x144/0x41c)

[  112.839538]  r10:cb23d680 r9:00000000 r8:c0c0f5e4 r7:ccd7f000 r6:00000000 r5:cb23d680

[  112.839591]  r4:cb39d8fc

[  112.839626] [<c0141d70>] (process_one_work) from [<c01421f8>] (worker_thread+0x6c/0x618)

[  112.839688]  r10:cb23d680 r9:00000008 r8:c0c0f5f8 r7:c0c14d40 r6:cb23d698 r5:cc720000

[  112.839740]  r4:c0c0f5e4

[  112.839782] [<c014218c>] (worker_thread) from [<c0147de8>] (kthread+0xf8/0x110)

[  112.839841]  r10:00000000 r9:00000000 r8:c014218c r7:cb23d680 r6:cc720000 r5:cb1b5380

[  112.839894]  r4:00000000

[  112.839933] [<c0147cf0>] (kthread) from [<c0107c38>] (ret_from_fork+0x14/0x3c)

[  112.839991]  r8:00000000 r7:00000000 r6:00000000 r5:c0147cf0 r4:cb1b5380

[  112.840030] ---[ end trace 52cd3a4f1ba8f685 ]---

In addition, there are times when I get the below dmesg dump when I had inserted the USB flash drive on the system. 

[ 3776.006935] sd 0:0:0:0: [sda] Write Protect is off

[ 3776.006986] sd 0:0:0:0: [sda] Mode Sense: 03 00 00 00

[ 3776.007243] sd 0:0:0:0: [sda] No Caching mode page found

[ 3776.007292] sd 0:0:0:0: [sda] Assuming drive cache: write through

[ 3776.433558]  sda: sda1

[ 3776.437536] FAT-fs (sda): bogus number of reserved sectors

[ 3776.437624] FAT-fs (sda): Can't find a valid FAT filesystem

[ 3776.447095] sd 0:0:0:0: [sda] Attached SCSI removable disk

Both these issues occur at times. A mere removal and insertion of the USB flash drive resolves this but issues like this affect us. We want USB detection/removal to be reliable and robust. Are there any latest patches etc available for this? Why do I get these issues at times? 

  • 0
    TI__Guru**** 181436 points

    Hi Fariya,

    I need more information to reproduce the issue on my setup to debug the issue.

    Fariya Fatima said:
    When I insert a GPT style FAT formatted USB flash drive it doesn't get detected and I get the below kernel crash at times during the USB flash removal time. The kernel I use is 4.9.31-gf9f6f0db2d (Arago). 

    Have you confirmed GPT format is the factor to trigger the issue? The legacy MBR format doesn't trigger it?

    If so, can you please share the steps to create the GPT format on the USB flash drive?

  • 0 in reply to Bin Liu
    Intellectual 810 points

    Hi,

    The GPT formatted flash drive gives me a kernel crash at times.. the crash dump I already put up in my earlier email... Below are the steps to create a GPT FAT partition on Windows:


    =================================
    # diskpart
    # list disk
    // Find the disk you want to convert
    # select disk 2  (assuming disk 2 is the flash drive)
    # clean
    # convert gpt
    # exit
    ====================
    To create a new partition
    # create partition primary
    # list volume

    Make sure the new volume is selected (look for the * on the left side) before you format the partition
    # format fs=fat

  • 0 in reply to Fariya Fatima
    TI__Guru**** 181436 points
    Hi Fariya,

    I tried to follow your instruction to create a GPT format 32GB thumb drive, but the "format" command always failed with error message "the volume size is too big", even if the partition is only 8GB.

    Are you sure the GPT format is the factor which triggers the issue? Does the issue also happens if you format your thumb drive to other format, for example ext4?

    Have you tried with different vendor's thumb drive?

    Does the issue happens on your custom board or any TI AM335x EVM?
  • 0 in reply to Fariya Fatima
    TI__Guru**** 181436 points
    Hi Fariya,

    I haven’t heard back from you, I’m assuming you were able to resolve your issue. If not, just post a reply below (or create a new thread if the thread has locked due to time-out). thanks.
  • 0 in reply to Bin Liu
    Intellectual 810 points
    The issue is not resolved. I will put in the exact steps to replicate this issue.
  • 0 in reply to Fariya Fatima
    TI__Guru**** 181436 points

    Fariya,

    Bin Liu said:
    Are you sure the GPT format is the factor which triggers the issue? Does the issue also happens if you format your thumb drive to other format, for example ext4?

    Have you tried with different vendor's thumb drive?

    Does the issue happens on your custom board or any TI AM335x EVM?

    Can you please answer my questions above to provide more information?

  • 0
    TI__Guru**** 181436 points
    Hi Fariya,

    I haven’t heard back from you, I’m assuming you were able to resolve your issue. If not, just post a reply below (or create a new thread if the thread has locked due to time-out). thanks.
  • 0 in reply to Bin Liu
    Intellectual 810 points
    Sorry for the late response:
    Are you sure the GPT format is the factor which triggers the issue? Does the issue also happens if you format your thumb drive to other format, for example ext4?
    >> Yes ext4 works fine

    Have you tried with different vendor's thumb drive?
    >> No haven;t tried.

    Does the issue happens on your custom board or any TI AM335x EVM?
    >> This issue happens on the beaglebone green wireless
  • 0 in reply to Fariya Fatima
    TI__Guru**** 181436 points
    Fariya,

    Since I am unable to create GPT format, I would need your help to provide more diagnosis information.
    - Can you please test with other vendor's thumb drives? with GPT and ext4 formats;
    - I don't have a Beaglebone Green board and it is not supported in Processor SDK Linux. Can you please test with other AM335x reference board, like EVM, StarterKit, or Beaglebone Black?

    What Linux disto and version do you use on Linux host to greart GPT?
  • 0 in reply to Bin Liu
    Intellectual 810 points
    OK I will test with AM335x EVM and confirm. To create GPT part I had used Ubuntu.
  • 0 in reply to Fariya Fatima
    TI__Guru**** 181436 points
    What is the version of the Ubuntu? I use 14.04.

    cat /etc/issue
  • 0 in reply to Fariya Fatima
    TI__Guru**** 181436 points
    Hi Fariya,

    Any update on your testing with AM335x EVM?
  • 0 in reply to Bin Liu
    Intellectual 810 points
    Hi Liu,

    I haven't been able to check on AM335x EVM. Will take me some time before I can test on an AM335x EVM. For now closing this issue. Will reopen when I test with AM335x EVM.
  • 0 in reply to Fariya Fatima
    TI__Guru**** 181436 points
    Thanks for the update.