Re: v6.1-rt4 rpi4 boot time atomic_sleep splat

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Hello Mike,
There is a patch-set currently ongoing aiming to solve this at:
  https://lore.kernel.org/all/20221121171217.3581004-1-pierre.gondois@xxxxxxx/

Regards,
Pierre

On 11/27/22 06:10, Mike Galbraith wrote:
Sole splat seen during brief master usability test drive.

(older rpi kernel is still way better idea, but it's improving.. boots,
runs and hdmi audio started working)

[    0.007076] smp: Bringing up secondary CPUs ...
[    0.008304] Detected PIPT I-cache on CPU1
[    0.008377] BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:46
[    0.008384] in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 0, name: swapper/1
[    0.008391] preempt_count: 1, expected: 0
[    0.008396] RCU nest depth: 1, expected: 1
[    0.008400] Preemption disabled at:
[    0.008403] [<ffffffd3244ca8e0>] migrate_enable+0x40/0x170
[    0.008425] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.1.0.g0b1dcc2-rt4 #25
[    0.008437] Hardware name: Raspberry Pi 4 Model B Rev 1.4 (DT)
[    0.008442] Call trace:
[    0.008445]  dump_backtrace.part.0+0xe8/0xf4
[    0.008455]  show_stack+0x20/0x50
[    0.008463]  dump_stack_lvl+0x64/0x80
[    0.008477]  dump_stack+0x18/0x34
[    0.008488]  __might_resched+0x15c/0x1c0
[    0.008502]  rt_spin_lock+0x38/0xd0
[    0.008514]  rmqueue_bulk+0x68/0x850
[    0.008529]  get_page_from_freelist+0xbe4/0xfa0
[    0.008542]  __alloc_pages+0x14c/0xf70
[    0.008554]  new_slab+0x2f0/0x374
[    0.008569]  ___slab_alloc+0x5f0/0xbcc
[    0.008584]  __kmem_cache_alloc_node+0xd0/0x380
[    0.008591]  __kmalloc+0x6c/0x1c0
[    0.008603]  detect_cache_attributes+0x448/0x564
[    0.008620]  update_siblings_masks+0x30/0x304
[    0.008631]  store_cpu_topology+0x48/0x60
[    0.008640]  secondary_start_kernel+0xc8/0x144
[    0.008656]  __secondary_switched+0xb0/0xb4
[    0.008752] CPU1: Booted secondary processor 0x0000000001 [0x410fd083]
[    0.010180] Detected PIPT I-cache on CPU2
[    0.010300] CPU2: Booted secondary processor 0x0000000002 [0x410fd083]
[    0.011522] Detected PIPT I-cache on CPU3
[    0.011649] CPU3: Booted secondary processor 0x0000000003 [0x410fd083]
[    0.011768] smp: Brought up 1 node, 4 CPUs




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