Subject: [Bug 207129] PowerMac G4 DP (5.6.2 debug kernel + inline KASAN) freezes shortly after booting with "do_IRQ: stack overflow: 1760"

From: [email-masked]
Date: Mon, 06 Apr 2020 12:26:32 +0000

https://bugzilla.kernel.org/show_bug.cgi?id=207129

--- Comment #2 from Erhard F. ([email-masked]) ---
Created attachment 288229
  --> https://bugzilla.kernel.org/attachment.cgi?id=288229&action=edit
screenshot01.jpg

Without CONFIG_DEBUG_STACKOVERFLOW things are better. The rsync completes, the
G4 was building stuff for 2 hours or so until I got these errors and a hard
freeze:

[...]
Oops: kernel stack overflow, sig: 11 [#1]
BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 PowerMac
Modules linked in: ...
CPU: 1 PID: 17105 Comm: kworker/u4:5 Tainted: G        W       
5.6.2-PowerMacG4+ #5
------------[ cut here  ]------------
kernel BUG at mm/usercopy.c:99!
Oops: Exception in kernel mode, sig: 5 [#2]
BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 PowerMac
Modules linked in: ...
CPU: 1 PID: 17185 Comm: kworker/u4:5 Tainted: G        W       
5.6.2-PowerMacG4+ #5
usercopy: Kernel memory overwrite attempt detected to kernel text (offset 6336,
size 4)!
------------[ cut here  ]------------
kernel BUG at mm/usercopy.c:99!
Oops: Exception in kernel mode, sig: 5 [#3]
BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 PowerMac
Modules linked in: ...
CPU: 1 PID: 17185 Comm: kworker/u4:5 Tainted: G        W       
5.6.2-PowerMacG4+ #5
usercopy: Kernel memory overwrite attempt detected to kernel text (offset 5336,
size 4)!
------------[ cut here  ]------------
kernel BUG at mm/usercopy.c:99!
Oops: Exception in kernel mode, sig: 5 [#4]
BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 PowerMac
Modules linked in: ...
CPU: 1 PID: 17185 Comm: kworker/u4:5 Tainted: G        W       
5.6.2-PowerMacG4+ #5
usercopy: Kernel memory overwrite attempt detected to kernel text (offset 4336,
size 4)!
------------[ cut here  ]------------
kernel BUG at mm/usercopy.c:99!
Oops: Exception in kernel mode, sig: 5 [#5]
BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 PowerMac
Modules linked in: ...
Unrecoverable FP Unavailable Exception 801 at 9b8
CPU: 1 PID: 17185 Comm: kworker/u4:5 Tainted: G        W       
5.6.2-PowerMacG4+ #5
usercopy: Kernel memory overwrite attempt detected to kernel text (offset 3336,
size 4)!
------------[ cut here  ]------------

Now running with CONFIG_THREAD_SHIFT=14 which runs fine so far... Did not try
without CONFIG_VMAP_STACK yet.

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