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SubjectRe: Linux 5.19-rc2
On Sun, Jun 12, 2022 at 04:36:20PM -0700, Linus Torvalds wrote:
> It's Sunday afternoon, so it must be time for another release candidate.
>
> As usual, rc2 is fairly small, and there isn't really a ton going on
> here. Fixes spread all over, and the diffstat is fairly flat apart
> from a few notable things that had bigger changes: some amdgpu fixes,
> the xen stub iommu driver, and some ceph and zonefs fixes. The rest is
> all pretty much one- or few-liners spread out mostly everywhere.
>
> And yes, because I expected the rc2 week to be fairly quiet, I did a
> system update on my workstation, and as a result I spent a day or two
> then sorting out most of the fallout from the resulting compiler
> upgrade to gcc-12. Some of it ended up being a bit heavy-handed, and
> we'll be tweaking things further. And some of it ends up being an
> actual compiler misfeature, but it's being discussed too and is
> limited to just one file on the 32-bit i386 side (and does not seem to
> result in any actual bad code, just excessive stack use).
>
> Anyway, nothing hugely scary going on, let's just keep testing and
> fixing things.
>

Build results:
total: 149 pass: 146 fail: 3
Failed builds:
arm:allmodconfig
mips:loongson2k_defconfig
powerpc:allmodconfig
Qemu test results:
total: 489 pass: 489 fail: 0

---
arm:allmodconfig

ERROR: modpost: missing MODULE_LICENSE() in drivers/watchdog/gxp-wdt.o

The fix is in -next, so hopefully Wim will send a pull request soon.

---
mips:loongson2k_defconfig

drivers/irqchip/irq-loongson-liointc.c: In function 'liointc_chained_handle_irq':
drivers/irqchip/irq-loongson-liointc.c:60:20: error: implicit declaration of function 'cpu_logical_map'

Caused by commit fa84f89395e03 ("irqchip/loongson-liointc: Fix build error for LoongArch").

---
powerpc:allmodconfig

Error: External symbol 'memset' referenced from prom_init.c
powerpc64-linux-ld:
drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o uses hard float,
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_resource.o uses soft float
and similar errors. No change since last week.

---
Runtime warning:

OF: amba_device_add() failed (-19) for /amba/smc@10100000
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 at lib/refcount.c:28 of_platform_bus_create+0x33c/0x3dc
refcount_t: underflow; use-after-free.

Fixed in -next.

There are also various UAF and "spinlock bad magic" BUG/WARNING logs in arm
boot tests. I don't know if those are new or if I just see them now because
I enabled KFENCE. Here is an (incomplete) sample.

[ 0.430290] printk: console [ramoops-1] printing thread started
[ 0.436219] BUG: spinlock bad magic on CPU#0, kdevtmpfs/23
[ 0.436250] lock: noop_backing_dev_info+0x6c/0x3b0, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
[ 0.436808] CPU: 0 PID: 23 Comm: kdevtmpfs Not tainted 5.19.0-rc2 #1

---

[ 7.918940] ------------[ cut here ]------------
[ 7.919062] WARNING: CPU: 0 PID: 0 at kernel/smp.c:913 smp_call_function_many_cond+0x38c/0x3a4
[ 7.919875] Modules linked in:
[ 7.920155] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc2 #1
[ 7.920248] Hardware name: ARM-Versatile Express
[ 7.920458] unwind_backtrace from show_stack+0x10/0x14
[ 7.920549] show_stack from dump_stack_lvl+0x50/0x6c
[ 7.920585] dump_stack_lvl from __warn+0xcc/0x19c
[ 7.920614] __warn from warn_slowpath_fmt+0x5c/0xb4
[ 7.920644] warn_slowpath_fmt from smp_call_function_many_cond+0x38c/0x3a4
[ 7.920674] smp_call_function_many_cond from smp_call_function+0x3c/0x50
[ 7.920702] smp_call_function from set_memory_valid+0x74/0x94
[ 7.920733] set_memory_valid from kfence_guarded_free+0x280/0x4bc
[ 7.920767] kfence_guarded_free from kmem_cache_free+0x2f4/0x394

I'll try to bisect as I find the time.

Guenter

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