linux-kernel - Re: Linux 6.13-rc6

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Message-ID: <g4sefofdrwu72ijhse7k57wuvrwhvn2eoqmc4jdoepkcgs7h5n@hmuhkwnye6pe>
Date: Mon, 6 Jan 2025 23:21:23 +0900
From: Koichiro Den <koichiro.den@...onical.com>
To: Borislav Petkov <bp@...en8.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>, 
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, 
	Andrew Morton <akpm@...ux-foundation.org>, stable@...r.kernel.org
Subject: Re: Linux 6.13-rc6

On Mon, Jan 06, 2025 at 02:18:17PM +0100, Borislav Petkov wrote:
> On Sun, Jan 05, 2025 at 02:20:54PM -0800, Linus Torvalds wrote:
> > So we had a slight pickup in commits this last week, but as expected
> > and hoped for, things were still pretty quiet. About twice as many
> > commits as the holiday week, but that's still not all that many.
> > 
> > I expect things will start becoming more normal now that people are
> > back from the holidays and are starting to recover and wake up from
> > their food comas.
> > 
> > In the meantime, below is the shortlog for the last week. Nothing
> > particularly stands out, the changes are dominated by various driver
> > updates (gpu, rdma and networking), with a random smattering of fixes
> > elsewhere.
> 
> Something not well baked managed to sneak in and it is tagged for stable:
> 
> adcfb264c3ed ("vmstat: disable vmstat_work on vmstat_cpu_down_prep()")
> 
> Reverting it fixes the warn splat below.
> 
> [    0.310373] smpboot: x86: Booting SMP configuration:
> [    0.311074] .... node  #0, CPUs:        #1  #2  #3  #4  #5  #6  #7  #8  #9 #10 #11 #12 #13 #14 #15
> [    0.313798] ------------[ cut here ]------------
> [    0.317530] workqueue: work disable count underflowed
> [    0.317530] WARNING: CPU: 1 PID: 21 at kernel/workqueue.c:4317 enable_work+0xa4/0xb0
> [    0.317530] Modules linked in:
> [    0.317530] CPU: 1 UID: 0 PID: 21 Comm: cpuhp/1 Not tainted 6.13.0-rc6 #11
> [    0.317530] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-8 02/21/2024
> [    0.317530] RIP: 0010:enable_work+0xa4/0xb0
> [    0.317530] Code: c0 48 83 c4 18 5b 5d e9 ca 25 9f 00 80 3d 0a c7 48 08 00 75 b3 c6 05 01 c7 48 08 01 90 48 c7 c7 c8 eb 1d 82 e8 5d 77 fd ff 90 <0f> 0b 90 90 eb 98 90 0f 0b 90 eb b1 90 90 90 90 90 90 90 90 90 90
> [    0.317530] RSP: 0018:ffffc90000137e18 EFLAGS: 00010082
> [    0.317530] RAX: 0000000000000029 RBX: ffff88807d66dda0 RCX: 00000000ffefffff
> [    0.317530] RDX: 0000000000000001 RSI: ffffc90000137ce0 RDI: 0000000000000001
> [    0.317530] RBP: 0000000000000000 R08: 00000000ffefffff R09: 0000000000000058
> [    0.317530] R10: 0000000000000000 R11: ffffffff8244df00 R12: 0000000000000000
> [    0.317530] R13: ffff88807d6604e0 R14: ffffffff812439f0 R15: ffff88807d660508
> [    0.317530] FS:  0000000000000000(0000) GS:ffff88807d640000(0000) knlGS:0000000000000000
> [    0.317530] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    0.317530] CR2: 0000000000000000 CR3: 0000000002c1a000 CR4: 00000000003506f0
> [    0.317530] Call Trace:
> [    0.317530]  <TASK>
> [    0.317530]  ? __warn+0xa0/0x160
> [    0.317530]  ? enable_work+0xa4/0xb0
> [    0.317530]  ? report_bug+0x18c/0x1c0
> [    0.317530]  ? handle_bug+0x54/0x90
> [    0.317530]  ? exc_invalid_op+0x1b/0x80
> [    0.317530]  ? asm_exc_invalid_op+0x1a/0x20
> [    0.317530]  ? __pfx_vmstat_cpu_online+0x10/0x10
> [    0.317530]  ? enable_work+0xa4/0xb0
> [    0.317530]  ? enable_work+0xa3/0xb0
> [    0.317530]  vmstat_cpu_online+0x61/0x80
> [    0.317530]  cpuhp_invoke_callback+0x10f/0x480
> [    0.317530]  ? srso_return_thunk+0x5/0x5f
> [    0.317530]  cpuhp_thread_fun+0xd4/0x160
> [    0.317530]  smpboot_thread_fn+0xdd/0x1f0
> [    0.317530]  ? __pfx_smpboot_thread_fn+0x10/0x10
> [    0.317530]  kthread+0xca/0xf0
> [    0.317530]  ? __pfx_kthread+0x10/0x10
> [    0.317530]  ret_from_fork+0x50/0x60
> [    0.317530]  ? __pfx_kthread+0x10/0x10
> [    0.317530]  ret_from_fork_asm+0x1a/0x30
> [    0.317530]  </TASK>
> [    0.317530] ---[ end trace 0000000000000000 ]---
> [    0.377680] smp: Brought up 1 node, 16 CPUs
> [    0.378345] smpboot: Total of 16 processors activated (118393.24 BogoMIPS)

Thanks for letting me know, and apologies for the inconvenience caused.
In the thread [1], I'm working on a follow-up fix with help from Lorenzo
and others. Please feel free to take any necessary action (e.g. revert).
Also, thank you, Greg, for [2].

[1]: https://lore.kernel.org/all/20241221033321.4154409-1-koichiro.den@canonical.com/T/#m11d983715699d3cea295b8618aba7b6ccec4db55
[2]: https://lore.kernel.org/stable/2025010603-tabasco-laziness-db0e@gregkh/

-Koichiro Den

> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette