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SubjectRe: [PATCH v4 11/19] sched/core: Make migrate disable and CPU hotplug cooperative
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FYI, it did crash on arm64 (Thunder X2) as well, so I'll re-run to gather more
information too.

.config: https://cailca.coding.net/public/linux/mm/git/files/master/arm64.config

[20370.682747][T77637] psci: CPU123 killed (polled 0 ms)
[20370.823651][ T635] IRQ 43: no longer affine to CPU124
[20370.828862][ T635] IRQ 49: no longer affine to CPU124
[20370.834072][ T635] IRQ 60: no longer affine to CPU124
[20370.839517][ T635] IRQ 94: no longer affine to CPU124
[20370.845778][T77637] CPU124: shutdown
[20370.861891][T77637] psci: CPU124 killed (polled 10 ms)
[20371.425434][T77637] CPU125: shutdown
[20371.441464][T77637] psci: CPU125 killed (polled 10 ms)
[20371.984072][T77637] CPU126: shutdown
[20372.000057][T77637] psci: CPU126 killed (polled 10 ms)
[20372.223858][ T650] ------------[ cut here ]------------
[20372.229599][ T650] kernel BUG at kernel/sched/core.c:7594!
[20372.235165][ T650] Internal error: Oops - BUG: 0 [#1] SMP
[20372.240643][ T650] Modules linked in: vfio_pci vfio_virqfd vfio_iommu_type1
vfio loop processor ip_tables x_tables sd_mod mlx5_core firmware_class ahci
libahci libata dm_mirror dm_region_hash dm_log dm_mod efivarfs
[20372.259814][ T650] CPU: 127 PID: 650 Comm: migration/127 Tainted: G L 5.10.0-rc6-next-20201203+ #5
[20372.270152][ T650] Hardware name: HPE Apollo 70 /C01_APACHE_MB , BIOS L50_5.13_1.16 07/29/2020
[20372.280579][ T650] Stopper: multi_cpu_stop+0x0/0x390 <- 0x0
[20372.286230][ T650] pstate: 20400089 (nzCv daIf +PAN -UAO -TCO BTYPE=--)
[20372.292923][ T650] pc : sched_cpu_dying+0x198/0x1b8
[20372.297879][ T650] lr : sched_cpu_dying+0x68/0x1b8
[20372.302748][ T650] sp : ffff00001076fba0
[20372.306747][ T650] x29: ffff00001076fba0 x28: 0000000000000000
[20372.312751][ T650] x27: 0000000000000001 x26: ffff800011db3000
[20372.318753][ T650] x25: ffff000e7bdd16a8 x24: 000000000000005a
[20372.324754][ T650] x23: 000000000000007f x22: 0000000000000080
[20372.330756][ T650] x21: 000000000000fab7 x20: ffff000e7be63818
[20372.336757][ T650] x19: ffff000e7be63800 x18: 1fffe001cf7cb3ed
[20372.342758][ T650] x17: 0000000000001308 x16: 0000000000000000
[20372.348759][ T650] x15: 000000000001053f x14: 000000000001053f
[20372.354761][ T650] x13: ffff6000020edf65 x12: 1fffe000020edf64
[20372.360763][ T650] x11: 1fffe000020edf64 x10: ffff6000020edf64
[20372.366764][ T650] x9 : dfff800000000000 x8 : ffff00001076fb23
[20372.372766][ T650] x7 : 0000000000000001 x6 : 0000000000000001
[20372.378767][ T650] x5 : 1fffe000020b9a0a x4 : dfff800000000000
[20372.384769][ T650] x3 : dfff800000000000 x2 : 0000000000000003
[20372.390770][ T650] x1 : ffff000e7be63840 x0 : 0000000000000002
[20372.396771][ T650] Call trace:
[20372.399905][ T650] sched_cpu_dying+0x198/0x1b8
[20372.404514][ T650] cpuhp_invoke_callback+0x208/0x2bf0
[20372.409730][ T650] take_cpu_down+0x11c/0x1f0
[20372.414165][ T650] multi_cpu_stop+0x184/0x390
[20372.418687][ T650] cpu_stopper_thread+0x1f0/0x430
[20372.423557][ T650] smpboot_thread_fn+0x3a8/0x9c8
[20372.428339][ T650] kthread+0x3a0/0x448
[20372.432253][ T650] ret_from_fork+0x10/0x1c
[20372.436517][ T650] Code: d65f03c0 911a82a2 140004fb 17ffffd9 (d4210000)
[20372.443298][ T650] ---[ end trace c51d5b6889ec29a8 ]---
[20372.448602][ T650] Kernel panic - not syncing: Oops - BUG: Fatal exception

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