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[Paolo Pisati <1452620@xxxxxxxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Paolo Pisati (p-pisati)

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https://bugs.launchpad.net/bugs/1452620

Title:
  beaglebone: kernel BUG on boot

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Booting a trusty kernel on a beaglebone, you often ends up with:

  ...
  [    9.758659] libphy: PHY 4a101000.mdio:01 not found
  [    9.763789] net eth0: phy 4a101000.mdio:01 not found on slave 1
  [   10.211356] ------------[ cut here ]------------
  [   10.216201] kernel BUG at /build/buildd/linux-3.13.0/kernel/timer.c:1084!
  [   10.223280] Internal error: Oops - BUG: 0 [#1] SMP ARM
  [   10.228637] Modules linked in: tda998x tilcdc drm_kms_helper omap_sham drm omap_aes omap_rng tps65217 uio_pdrv_genirq uio leds_gpio nls1
  [   10.242317] CPU: 0 PID: 302 Comm: systemd-udevd Not tainted 3.13.0-52-generic #86-Ubuntu
  [   10.250758] task: db1085c0 ti: db35c000 task.ti: db35c000
  [   10.256398] PC is at cascade+0x98/0x9c
  [   10.260305] LR is at cascade+0x80/0x9c
  [   10.264212] pc : [<c0060ab4>]    lr : [<c0060a9c>]    psr: 80030193
  [   10.264212] sp : db35dd18  ip : fffee500  fp : 000000a9
  [   10.276182] r10: c0a78080  r9 : db35c000  r8 : db35dd58
  [   10.281627] r7 : 00000025  r6 : db35dd18  r5 : c0b48a80  r4 : c0b493f4
  [   10.288432] r3 : db22b0a8  r2 : 0000002c  r1 : de217230  r0 : c0b493f4
  [   10.295239] Flags: Nzcv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
  [   10.302770] Control: 10c5387d  Table: 9b398019  DAC: 00000015
  [   10.308760] Process systemd-udevd (pid: 302, stack limit = 0xdb35c238)
  [   10.315565] Stack: (0xdb35dd18 to 0xdb35e000)
  [   10.320107] dd00:                                                       db22b0a8 c0acd78c
  [   10.328637] dd20: c0a713b0 c0b48a80 00000000 00000004 c0a78088 c0060ce4 c0a713b8 c1024458
  [   10.337167] dd40: c1024490 00200200 c0b32c30 c0a780c0 c0b49294 c0b49494 6071f4b5 00000002
  [   10.345697] dd60: 6071f4b5 00000001 00000101 00000004 c0a78088 c0a78084 db35c000 c0a78080
  [   10.354226] dd80: 000000a9 c0058bf8 00000001 00015200 00000100 00000004 c0a71540 c0b32ba4
  [   10.362756] dda0: 00000000 0000000a c0b48840 c0a780c0 fffee501 db35c008 c0ac0360 00400140
  [   10.371285] ddc0: db1085c0 db35c028 00000054 00000000 00000054 01b8216c db1085c0 db1f08f8
  [   10.379816] dde0: 000000a9 c005917c c0a73030 c0010420 fa200000 c0b477ac db35de18 c00093f4
  [   10.388346] de00: c00975d4 c00975d4 60030113 ffffffff db35de4c c06baac0 db1f08fc 00030113
  [   10.396877] de20: db1f0900 000002ef db1f08f8 db1f08fc 00000001 00000817 01b8216c db1085c0
  [   10.405407] de40: db1f08f8 000000a9 00000000 db35de60 c00975d4 c00975d4 60030113 ffffffff
  [   10.413938] de60: db35dfb0 db35c030 db1f08c0 c06bc098 00000001 c0160cd4 db320d80 db35dee8
  [   10.422468] de80: 00000001 db320e90 00000800 00000000 00000000 00000000 00000561 00000001
  [   10.430997] dea0: 00000561 0000007f db35df08 db35df00 00080001 00000001 db245010 00000000
  [   10.439526] dec0: 00000561 00000000 01b81be1 00000000 c0194868 00000000 00000000 db35dfb0
  [   10.448054] dee0: 00000817 01b8216c 01b8216c db35dfb0 00020420 00000581 000000b1 c06bc410
  [   10.456583] df00: 00000817 c06bc3ac c0a84b98 c00091d4 04000000 00000000 ddc3f090 c015effc
  [   10.465111] df20: 00000000 00000000 04000000 00000000 04000000 00000000 00000000 00002000
  [   10.473639] df40: 00000000 c0194974 00000000 db320e48 04000000 00000000 00000000 00000000
  [   10.482167] df60: be826bf8 be826bf8 00000008 00000000 00000000 c015f14c 00000000 c015faac
  [   10.490695] df80: 00002000 00000000 00000000 01b76468 00000000 00000000 b6dbd3c6 20030030
  [   10.499223] dfa0: ffffffff 00000589 00000588 c06bac38 00000589 00000000 0001fe99 01b82168
  [   10.507753] dfc0: 01b81be8 b6e4b4e8 01b81be0 00000589 00000588 00020420 00000581 000000b1
  [   10.516281] dfe0: 00000598 be826b68 b6dbf011 b6dbd3c6 20030030 ffffffff 00000000 00000000
  [   10.524829] [<c0060ab4>] (cascade+0x98/0x9c) from [<c0060ce4>] (run_timer_softirq+0x22c/0x2b4)
  [   10.533821] [<c0060ce4>] (run_timer_softirq+0x22c/0x2b4) from [<c0058bf8>] (__do_softirq+0x144/0x340)
  [   10.543442] [<c0058bf8>] (__do_softirq+0x144/0x340) from [<c005917c>] (irq_exit+0xd8/0x120)
  [   10.552162] [<c005917c>] (irq_exit+0xd8/0x120) from [<c0010420>] (handle_IRQ+0x44/0x90)
  [   10.560515] [<c0010420>] (handle_IRQ+0x44/0x90) from [<c00093f4>] (omap3_intc_handle_irq+0x8c/0x9c)
  [   10.569959] [<c00093f4>] (omap3_intc_handle_irq+0x8c/0x9c) from [<c06baac0>] (__irq_svc+0x40/0x54)
  [   10.579300] Exception stack(0xdb35de18 to 0xdb35de60)
  [   10.584564] de00:                                                       db1f08fc 00030113
  [   10.593093] de20: db1f0900 000002ef db1f08f8 db1f08fc 00000001 00000817 01b8216c db1085c0
  [   10.601623] de40: db1f08f8 000000a9 00000000 db35de60 c00975d4 c00975d4 60030113 ffffffff
  [   10.610172] [<c06baac0>] (__irq_svc+0x40/0x54) from [<c00975d4>] (__down_read_trylock+0x4c/0x54)
  [   10.619346] [<c00975d4>] (__down_read_trylock+0x4c/0x54) from [<c06bc098>] (do_page_fault.part.11+0x78/0x38c)
  [   10.629694] [<c06bc098>] (do_page_fault.part.11+0x78/0x38c) from [<c06bc410>] (do_page_fault+0x64/0x6c)
  [   10.639493] [<c06bc410>] (do_page_fault+0x64/0x6c) from [<c00091d4>] (do_DataAbort+0x38/0x98)
  [   10.648387] [<c00091d4>] (do_DataAbort+0x38/0x98) from [<c06bac38>] (__dabt_usr+0x38/0x40)
  [   10.657005] Exception stack(0xdb35dfb0 to 0xdb35dff8)
  [   10.662271] dfa0:                                     00000589 00000000 0001fe99 01b82168
  [   10.670802] dfc0: 01b81be8 b6e4b4e8 01b81be0 00000589 00000588 00020420 00000581 000000b1
  [   10.679329] dfe0: 00000598 be826b68 b6dbf011 b6dbd3c6 20030030 ffffffff
  [   10.686227] Code: 1afffff4 e1a00007 e28dd00c e8bd80f0 (e7f001f2) 
  [   10.692585] ---[ end trace 40b1369a4ac46bf7 ]---
  [   10.697399] Kernel panic - not syncing: Fatal exception in interrupt
  [   10.704029] drm_kms_helper: panic occurred, switching back to text console

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