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

[bugzilla-daemon at bugzilla.kernel.org]

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

            Bug ID: 206501
           Summary: Kernel 5.6-rc1 fails to boot on a PowerMac G4 3,6 with
                    CONFIG_VMAP_STACK=y: Oops! Machine check, sig: 7  [#1]
           Product: Platform Specific/Hardware
           Version: 2.5
    Kernel Version: 5.6.0-rc1
          Hardware: PPC-32
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PPC-32
          Assignee: platform_ppc-32 at kernel-bugs.osdl.org
          Reporter: erhard_f at mailbox.org
        Regression: No

Created attachment 287311
  --> https://bugzilla.kernel.org/attachment.cgi?id=287311&action=edit
screenshot

The G4 boots fine with CONFIG_VMAP_STACK=n, but fails to boot with
CONFIG_VMAP_STACK=y.

[...]
NIP [c001c194] create_hpte+0xa8/0x120
LR [c001c0c4] add_hash_page+0x88/0xb0
Call Trace:
[f101dde8] [cO181568] alloc_set_pte+0x184/0x214 (unreliable)
[f101de18] [cO14d168] filemap_map_pages+0x21c/0x250
[f101de68] [c0181cf4] handle_mm_fault+0x66c/0x90c
[f101dee8] [c0019aac] do_page_fault+0x690/0x804
[f101df38] [c0014450] handle_page_fault+0x10/0x3c
--- interrupt: 401 at Oxb77ffd10
    LR = 0x0
Instruction dump:
6c64003f 6884ffx0 3884fff8 7c0903a6 84x40008 7c062800 4002fff8 41a2008c
68a50040 7c0903a6 3883fff8 84c40008 <54c60001> 4002fff8 41a20070 3c80c08e
---[ end trace cd24dd23c7db9d53 ]---

Machine check in kernel mode.
Caused by (from SRR1=141020): Transfer error ack signal
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000007

(OCRed screenshot + corrections by hand)

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