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[Víctor R. Ruiz <1426272@xxxxxxxxxxxxxxxxxx>]

I also experienced this problem, while doing a test I tapped an app icon
in the Dash and the device suddenly freezed for a while and finally
rebooted. No crash files were available in /var/crash.

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https://bugs.launchpad.net/bugs/1426272

Title:
  vivid-proposed/krillin - Phone reboots spontaneously

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  current build number: 122
  device name: krillin
  channel: ubuntu-touch/devel-proposed
  alias: ubuntu-touch/vivid-proposed
  last update: 2015-02-25 15:06:29
  version version: 122
  version ubuntu: 20150225
  version device: 20150210-95b6a9f
  version custom: 20150225

  
  It happened up to 3 times a day, the phone reboots with no apparent reason. syslog doesn't work on the phone but /proc/last_kmsg shows the following message:

  [  793.598710]systemd-logind[16120]: Failed to start user service: Unknown unit: user@0.service
  [  793.606282]systemd-logind[16120]: Failed to start user service: Unknown unit: user@32011.service
  [  806.517752]systemd-logind[16242]: Failed to start user service: Unknown unit: user@0.service
  [  806.521333]systemd-logind[16242]: Failed to start user service: Unknown unit: user@32011.service
  [  809.797251]Restarting system.
  [  809.797336][<c0015404>] (unwind_backtrace+0x0/0x104) from [<c07db344>] (dump_stack+0x20/0x24)
  [  809.797366][<c0015404>] (unwind_backtrace+0x0/0x104) from [<c07db344>] (dump_stack+0x20/0x24)
  [  809.797396][<c07db344>] (dump_stack+0x20/0x24) from [<c0014110>] (handle_IPI+0xf4/0x250)
  [  809.797424][<c07db344>] (dump_stack+0x20/0x24) from [<c0014110>] (handle_IPI+0xf4/0x250)
  [  809.797452][<c0014110>] (handle_IPI+0xf4/0x250) from [<c00085bc>] hdo_IPI+0x18/0x1c)
  [  809.797477][<c0014110>] (handle_IPI+0xf4/0x250) from [<c00085bc>] (do_IPI+0x18/0x1c)
  [  809.797502][<c00085bc>] (do_IPI+0x18/0x1c) from [<c07eb9f4>] (__irq_svc+0x34/0xc8)
  [  809.797529][<c00085bc>] (do_IPI+0x18/0x1c) from [<c07eb9f4>] (__irq_svc+0x34/0xc8)
  [  809.797686][<c07eb9f4>] (8e1fac dc+0x34/0xc8) from [<c000f178>] (78 20070013 ffffffff
  [  809.797718][<c07eb9f4>] (__irq_svc+0x34/0xc8) from [<c000f178>] (default_idle+0x2c/0x40)
  [  809.797747][<c000f178>] (default_idle+0x2c/0x40) from [<c000f5a0>defcpu_idle+0xb0/0x10c)
  [  809.797775][<c000f178>] (default_idle+0x2c/0x40) from [<c000f5a0>] (cpu_idle+0xb0/0x10c)
  [  809.797804][<c000f5a0>] (cpu_idle+0xb0/0x10c) from [<c07d8448>] (secondary_start_kernel+0x1cc/0x1e8)
  [  809.797834][<c000f5a0>] (cpu_idle+0xb0/0x10c) from [<c07d8448>] (secondary_start_kernel+0x1cc/0x1e8)
  [  809.797863][<c07d8448>] (secondary_start_kernel+0x1cc/0x1e8) fromsecondary_start0x807d7d8c)
  [  809.797889][<c07d8448>] (secondary_start_kernel+0x1cc/0x1e8) from [<807d7d8c>] (0x807d7d8c)
  [  809.797915][<c07d8448>] (secondary_start_kernel+0x1cc/0x1e8) from [<807d7d8c>] (0x807d7d8c)
  [  809.797964][<c07db344>] (dump_stack+0x20/0x24) from [<c0014110>] (handle_IPI+0xf4/0x250)
  [  809.798009][<c0014110>] (handle_IPI+0xf4/0x250) from [<c00085bc>] (do_IPI+0x18/0x1c)
  [  809.798056][<c00085bc>] (do_IPI+0x18/0x1c) from [<c07eb9f4>] (__irq_svc+0x34/0xc8)
  [  809.798218][<c07eb9f4>] (__irq_svc+0x34/0xc8) from [<c000f178>] (default_idle+0x2c/0x40)
  [  809.798269][<c000f178>] (default_idle+0x2c/0x40) from [<c000f5a0>] (cpu_idle+0xb0/0x10c)
  [  809.798319][<c000f5a0>] (cpu_idle+0xb0/0x10c) from [<c07d8448>] (secondary_start_kernel+0x1cc/0x1e8)
  [  809.798365][<c07d8448>] (secondary_start_kernel+0x1cc/0x1e8) from [<807d7d8c>] (0x807d7d8c)

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