linux-kernel - Re: Linux 6.8-rc5

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Date: Tue, 20 Feb 2024 11:08:59 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 6.8-rc5

On Sun, Feb 18, 2024 at 01:13:34PM -0800, Linus Torvalds wrote:
[ ... ]
> 
> Please commence testing,
> 

Build results:
	total: 155 pass: 151 fail: 4
Failed builds:
	csky:allmodconfig
	openrisc:allmodconfig
	parisc:allmodconfig
	xtensa:allmodconfig
Qemu test results:
	total: 549 pass: 547 fail: 2
Unit test results:
	pass: 161596 fail: 740

============
Build errors

Building csky:allmodconfig ... failed
Building openrisc:allmodconfig ... failed
Building parisc:allmodconfig ... failed
Building xtensa:allmodconfig ... failed

--------------
Error log:
ERROR: modpost: "__umoddi3" [drivers/gpu/drm/tests/drm_buddy_test.ko] undefined!
ERROR: modpost: "__moddi3" [drivers/gpu/drm/tests/drm_buddy_test.ko] undefined!

Commit a64056bb5a32 ("drm/tests/drm_buddy: add alloc_contiguous test"):

+       u64 mm_size, ps = SZ_4K, i, n_pages, total;
..
+       n_pages = mm_size / ps;

This patch breaks the build on all 32-bit systems since it introduces an
unhandled direct 64-bit divide operation.

Runtime crashes
===============

Nothing new, so shortened.

an385:mps2_defconfig:mps2-an385:initrd
xtensa:de212:kc705-nommu:nommu_kc705_defconfig

Warning backtraces
==================

WARNING: inconsistent lock state
6.8.0-rc4 #1 Tainted: G                 N
--------------------------------
inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
kworker/0:2/39 [HC1[1]:SC0[2]:HE0:SE0] takes:
ef792074 (&syncp->seq#2){?...}-{0:0}, at: sun8i_dwmac_dma_interrupt+0x9c/0x28c
{HARDIRQ-ON-W} state was registered at: 
  lock_acquire+0x11c/0x368
  __u64_stats_update_begin+0x104/0x1ac
  stmmac_xmit+0x4d0/0xc58
  dev_hard_start_xmit+0xc4/0x2a0
  sch_direct_xmit+0xf8/0x30c
  __dev_queue_xmit+0x400/0xcc4
  ip6_finish_output2+0x254/0xafc
  mld_sendpack+0x260/0x5b0
  mld_ifc_work+0x274/0x588
  process_one_work+0x230/0x604
  worker_thread+0x1dc/0x494
  kthread+0x100/0x120
  ret_from_fork+0x14/0x28

Caused by commit 38cc3c6dcc09 ("net: stmmac: protect updates of 64-bit
statistics counters.")

Report:
https://lore.kernel.org/lkml/ea1567d9-ce66-45e6-8168-ac40a47d1821@roeck-us.net/

Unit test failures
==================

Previously reported:

checksum (various architectures)
cpumask (parisc only)
stackinit (m68k only)

New (that is, newly enabled)

mean and variance tests (all architectures)
-------------------------------------------

This is bcachefs related.

test cases 2 and 4 fail on all architectures/branches, and I don't see how
those tests can pass. See report for details.

Report:
https://lore.kernel.org/lkml/065b94eb-6a24-4248-b7d7-d3212efb4787@roeck-us.net/

drm kunit tests (all architecstures, with qemu)
-----------------------------------------------

Failures all over the place when running in qemu, followed by list corruptions
and a crash. Anyone interested is invited to enable CONFIG_DRM_KUNIT_TEST,
CONFIG_DRM_TTM_KUNIT_TEST, CONFIG_DRM_XE_KUNIT_TEST, CONFIG_DRM_VC4_KUNIT_TEST
together with lockdep and list debugging, run the resulting images in qemu,
and look at the results.

Note: This is a one-time report; there are two many issues to list here.
I reported a recently introduced problem at
https://lore.kernel.org/lkml/a45b796d-5e04-4eac-b5ba-ea6bb3b6131b@roeck-us.net/
and tried to analyze further, but there are just too many issues and I gave up.