linux-kernel - Re: [ANNOUNCE] v5.12-rc3-rt3

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Message-ID: <1f63f1fcea10fc179881384cd838b1c9e5207b82.camel@gmx.de>
Date:   Sat, 20 Mar 2021 09:18:32 +0100
From:   Mike Galbraith <efault@....de>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [ANNOUNCE] v5.12-rc3-rt3

On Fri, 2021-03-19 at 23:33 +0100, Sebastian Andrzej Siewior wrote:
> Dear RT folks!
>
> I'm pleased to announce the v5.12-rc3-rt3 patch set.

My little rpi4b is fairly unhappy with 5.12-rt, whereas 5.11-rt works
fine on it.  The below spew is endless, making boot endless.  I turned
it into a WARN_ON_ONCE to see if the thing would finish boot, and
surprisingly, it seems perfectly fine with that bad idea. Having not
the foggiest clue what I'm doing down in arm arch-land, bug is in no
immediate danger :)

[    2.216913] WARNING: CPU: 0 PID: 1 at arch/arm64/include/asm/pgtable.h:982 do_set_pte+0x1cc/0x1d4
[    2.216949] Modules linked in:
[    2.216961] CPU: 0 PID: 1 Comm: init Not tainted 5.12.0.g425ed5a-v8-rt #33
[    2.216973] Hardware name: Raspberry Pi 4 Model B Rev 1.4 (DT)
[    2.216979] pstate: 20000005 (nzCv daif -PAN -UAO -TCO BTYPE=--)
[    2.216990] pc : do_set_pte+0x1cc/0x1d4
[    2.217004] lr : filemap_map_pages+0x178/0x380
[    2.217016] sp : ffffffc01153bbb0
[    2.217020] x29: ffffffc01153bbb0 x28: fffffffe07d93080
[    2.217033] x27: 0000000000000000 x26: ffffff8101c9e000
[    2.217044] x25: ffffff8101b40fd8 x24: 0000000000000000
[    2.217054] x23: ffffff8101674170 x22: 0000007fb1b4b000
[    2.217064] x21: fffffffe07d93080 x20: ffffffc01153bcf0
[    2.217073] x19: 00200001f64c2fc3 x18: 0000000000000000
[    2.217082] x17: 0000000000000000 x16: 0000000000000000
[    2.217091] x15: 0000000000000000 x14: 0000000000000000
[    2.217100] x13: 0000000000000000 x12: 0000000000000000
[    2.217108] x11: 0000000000000000 x10: 0000000000000000
[    2.217117] x9 : ffffffc010209068 x8 : 000000000000000f
[    2.217126] x7 : ffffff8101e87c68 x6 : fffffffe00000000
[    2.217135] x5 : 0000000000101e8b x4 : ffffff8101e880a8
[    2.217144] x3 : 0020000000000fc3 x2 : 0000000000000000
[    2.217153] x1 : 0000000000000000 x0 : 0000000000000000
[    2.217162] Call trace:
[    2.217166]  do_set_pte+0x1cc/0x1d4
[    2.217181]  filemap_map_pages+0x178/0x380
[    2.217189]  __handle_mm_fault+0x75c/0x930
[    2.217202]  handle_mm_fault+0x178/0x25c
[    2.217214]  do_page_fault+0x16c/0x470
[    2.217233]  do_translation_fault+0xbc/0xd8
[    2.217244]  do_mem_abort+0x4c/0xbc
[    2.217259]  el0_ia+0x68/0xcc
[    2.217272]  el0_sync_handler+0x180/0x1b0
[    2.217284]  el0_sync+0x170/0x180