[meta-freescale] BUG: scheduling while atomic in _cpu_down

[Tudor Florea]

Hi,
The "reboot" command produce the  exception below on Linux-qoriq, low latency preemption on daisy branch.
Is this a known issue? Does anyone have a  hint to fix this?
Thank you very much.
  Regards,
   Tudor

# uname -a
Linux m2020 3.8.13-rt9+ #2 SMP PREEMPT Wed Jan 7 12:10:54 CET 2015 ppc GNU/Linux

#zcat /proc/config.gz | grep PREEMPT
CONFIG_TREE_PREEMPT_RCU=y
CONFIG_PREEMPT_RCU=y
CONFIG_PREEMPT=y
CONFIG_HAVE_PREEMPT_LAZY=y
# CONFIG_PREEMPT_NONE is not set
# CONFIG_PREEMPT_VOLUNTARY is not set
CONFIG_PREEMPT__LL=y
# CONFIG_PREEMPT_RTB is not set
# CONFIG_PREEMPT_RT_FULL is not set
CONFIG_PREEMPT_COUNT=y
CONFIG_DEBUG_PREEMPT=y
CONFIG_PREEMPT_TRACER=y
# CONFIG_PREEMPT_OFF_HIST is not set
Rebooting... Disabling non-boot CPUs ...
BUG: scheduling while atomic: reboot/2286/0x00000002
Modules linked in:
Preemption disabled at:[< (null)>] (null)

Call Trace:
[ee471aa0] [c000d3c4] show_stack+0x180/0x2c4 (unreliable)
[ee471af0] [c00dc594] __schedule_bug+0xf0/0x150
[ee471b10] [c0a7ad4c] __schedule+0xdc/0x1018
[ee471c30] [c0a79728] schedule_timeout+0x360/0x3b4
[ee471ca0] [c0a7a9e0] wait_for_common+0x120/0x228
[ee471cf0] [c00c4e20] kthread_create_on_node+0x9c/0x15c
[ee471d60] [c01b80b4] _cpu_down+0x6dc/0x7bc
[ee471dd0] [c0084e8c] disable_nonboot_cpus+0x108/0x1fc
[ee471e10] [c00a9960] kernel_restart+0x28/0xbc
[ee471e20] [c00a9b4c] sys_reboot+0x12c/0x24c
[ee471f40] [c0018380] ret_from_syscall+0x0/0x3c
--- Exception: c01 at 0xff06a6c
    LR = 0x10000c24
BUG: scheduling while atomic: reboot/2286/0x00000002
Modules linked in:
Preemption disabled at:[<  (null)>]   (null)

Call Trace:
[ee471b10] [c000d3c4] show_stack+0x180/0x2c4 (unreliable)
[ee471b60] [c00dc594] __schedule_bug+0xf0/0x150
[ee471b80] [c0a7ad4c] __schedule+0xdc/0x1018
[ee471ca0] [c0a79728] schedule_timeout+0x360/0x3b4
[ee471d10] [c0a7a9e0] wait_for_common+0x120/0x228
[ee471d60] [c01b7e20] _cpu_down+0x448/0x7bc
[ee471dd0] [c0084e8c] disable_nonboot_cpus+0x108/0x1fc
[ee471e10] [c00a9960] kernel_restart+0x28/0xbc
[ee471e20] [c00a9b4c] sys_reboot+0x12c/0x24c
[ee471f40] [c0018380] ret_from_syscall+0x0/0x3c
--- Exception: c01 at 0xff06a6c
    LR = 0x10000c24
BUG: scheduling while atomic: reboot/2286/0x00000002
Modules linked in:
Preemption disabled at:[<  (null)>]   (null)

Call Trace:
[ee471a70] [c000d3c4] show_stack+0x180/0x2c4 (unreliable)
[ee471ac0] [c00dc594] __schedule_bug+0xf0/0x150
[ee471ae0] [c0a7ad4c] __schedule+0xdc/0x1018
[ee471c00] [c0a79728] schedule_timeout+0x360/0x3b4
[ee471c70] [c0a7a9e0] wait_for_common+0x120/0x228
[ee471cc0] [c00b5710] flush_work+0x1e0/0x2cc
[ee471d10] [c0a97a14] workqueue_cpu_down_callback+0x54/0x70
[ee471d30] [c0a857f8] notifier_call_chain+0xc8/0x124
[ee471d60] [c01b7e44] _cpu_down+0x46c/0x7bc
[ee471dd0] [c0084e8c] disable_nonboot_cpus+0x108/0x1fc
[ee471e10] [c00a9960] kernel_restart+0x28/0xbc
[ee471e20] [c00a9b4c] sys_reboot+0x12c/0x24c
[ee471f40] [c0018380] ret_from_syscall+0x0/0x3c
--- Exception: c01 at 0xff06a6c
    LR = 0x10000c24
BUG: scheduling while atomic: reboot/2286/0x00000002
Modules linked in:
Preemption disabled at:[<  (null)>]   (null)

Call Trace:
[ee471ad0] [c000d3c4] show_stack+0x180/0x2c4 (unreliable)
[ee471b20] [c00dc594] __schedule_bug+0xf0/0x150
[ee471b40] [c0a7ad4c] __schedule+0xdc/0x1018
[ee471c60] [c0a79728] schedule_timeout+0x360/0x3b4
[ee471cd0] [c0a7a9e0] wait_for_common+0x120/0x228
[ee471d20] [c00c5dd0] kthread_park+0x188/0x18c
[ee471d40] [c00d7390] smpboot_park_threads+0x90/0xb8
[ee471d60] [c01b7e64] _cpu_down+0x48c/0x7bc
[ee471dd0] [c0084e8c] disable_nonboot_cpus+0x108/0x1fc
[ee471e10] [c00a9960] kernel_restart+0x28/0xbc
[ee471e20] [c00a9b4c] sys_reboot+0x12c/0x24c
[ee471f40] [c0018380] ret_from_syscall+0x0/0x3c
--- Exception: c01 at 0xff06a6c
    LR = 0x10000c24
BUG: scheduling while atomic: reboot/2286/0x00000002
Modules linked in:
Preemption disabled at:[<  (null)>]   (null)

Call Trace:
[ee471b10] [c000d3c4] show_stack+0x180/0x2c4 (unreliable)
[ee471b60] [c00dc594] __schedule_bug+0xf0/0x150
[ee471b80] [c0a7ad4c] __schedule+0xdc/0x1018
[ee471ca0] [c0a79728] schedule_timeout+0x360/0x3b4
[ee471d10] [c0a7a9e0] wait_for_common+0x120/0x228
[ee471d60] [c01b7ea8] _cpu_down+0x4d0/0x7bc
[ee471dd0] [c0084e8c] disable_nonboot_cpus+0x108/0x1fc
[ee471e10] [c00a9960] kernel_restart+0x28/0xbc
[ee471e20] [c00a9b4c] sys_reboot+0x12c/0x24c
[ee471f40] [c0018380] ret_from_syscall+0x0/0x3c
--- Exception: c01 at 0xff06a6c
    LR = 0x10000c24
BUG: scheduling while atomic: reboot/2286/0x00000002
Modules linked in:
Preemption disabled at:[<  (null)>]   (null)

Call Trace:
[ee471ae0] [c000d3c4] show_stack+0x180/0x2c4 (unreliable)
[ee471b30] [c00dc594] __schedule_bug+0xf0/0x150
[ee471b50] [c0a7ad4c] __schedule+0xdc/0x1018
[ee471c70] [c0a79728] schedule_timeout+0x360/0x3b4
[ee471ce0] [c0a7a9e0] wait_for_common+0x120/0x228
[ee471d30] [c00c5a40] kthread_stop+0x324/0x354
[ee471d60] [c01b7eb0] _cpu_down+0x4d8/0x7bc
[ee471dd0] [c0084e8c] disable_nonboot_cpus+0x108/0x1fc
[ee471e10] [c00a9960] kernel_restart+0x28/0xbc
[ee471e20] [c00a9b4c] sys_reboot+0x12c/0x24c
[ee471f40] [c0018380] ret_from_syscall+0x0/0x3c
--- Exception: c01 at 0xff06a6c
    LR = 0x10000c24
BUG: scheduling while atomic: reboot/2286/0x00000002
Modules linked in:
Preemption disabled at:[<  (null)>]   (null)

Call Trace:
[ee471b20] [c000d3c4] show_stack+0x180/0x2c4 (unreliable)
[ee471b70] [c00dc594] __schedule_bug+0xf0/0x150
[ee471b90] [c0a7ad4c] __schedule+0xdc/0x1018
[ee471cb0] [c0133814] wait_for_stop_done+0x40/0x8c
[ee471cc0] [c0133e00] __stop_cpus+0x6c/0x94
[ee471cf0] [c01342bc] stop_cpus+0x4c/0x70
[ee471d10] [c0134554] __stop_machine+0x1d0/0x1e4
[ee471d60] [c01b7ecc] _cpu_down+0x4f4/0x7bc
[ee471dd0] [c0084e8c] disable_nonboot_cpus+0x108/0x1fc
[ee471e10] [c00a9960] kernel_restart+0x28/0xbc
[ee471e20] [c00a9b4c] sys_reboot+0x12c/0x24c
[ee471f40] [c0018380] ret_from_syscall+0x0/0x3c
--- Exception: c01 at 0xff06a6c
    LR = 0x10000c24
BUG: scheduling while atomic: reboot/2286/0x00000002
Modules linked in:
Preemption disabled at:[<  (null)>]   (null)

Call Trace:
[ee471b30] [c000d3c4] show_stack+0x180/0x2c4 (unreliable)
[ee471b80] [c00dc594] __schedule_bug+0xf0/0x150
[ee471ba0] [c0a7ad4c] __schedule+0xdc/0x1018
[ee471cc0] [c0a7962c] schedule_timeout+0x264/0x3b4
[ee471d30] [c009d720] msleep+0x34/0x50
[ee471d40] [c001ac34] generic_cpu_die+0x48/0xc4
[ee471d60] [c01b7f34] _cpu_down+0x55c/0x7bc
[ee471dd0] [c0084e8c] disable_nonboot_cpus+0x108/0x1fc
[ee471e10] [c00a9960] kernel_restart+0x28/0xbc
[ee471e20] [c00a9b4c] sys_reboot+0x12c/0x24c
[ee471f40] [c0018380] ret_from_syscall+0x0/0x3c
--- Exception: c01 at 0xff06a6c
    LR = 0x10000c24
Restarting system.