Subject: [Bug 206501] Kernel 5.6-rc1 fails to boot on a PowerMac G4 3,6 with CONFIG_VMAP_STACK=y: Oops! Machine check, sig: 7 [#1]

From: [email-masked]
Date: Wed, 12 Feb 2020 17:47:33 +0000

https://bugzilla.kernel.org/show_bug.cgi?id=206501

--- Comment #5 from Christophe Leroy ([email-masked]) ---
Interesting.

NIP:  00000550
NIP:  0000045c
NIP:  00000c38
NIP:  00000370

The kernel seems to badly fault on the first write to the stack. This suggests
that there is no page allocated for the stack yet. Which is unexpected because
in copy_thread_tls() several writes to the stack are performed so the pages
must exist in page tables.

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