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Message-ID: <e2ffd3d06fad236ea900d4fb439b2240@aosc.io>
Date: Tue, 05 Nov 2024 15:17:54 +0800
From: Mingcong Bai <jeffbai@...c.io>
To: Linux regressions mailing list <regressions@...ts.linux.dev>
Cc: Frederic Weisbecker <frederic@...nel.org>, LKML
<linux-kernel@...r.kernel.org>, "Paul E. McKenney" <paulmck@...nel.org>, rcu
<rcu@...r.kernel.org>, sakiiily@...c.io
Subject: Re: [Regression] wifi problems since tg3 started throwing rcu stall
warnings
Hi Frederic and Thorston,
(CC-ing the laptop's owner so that she might help with further
testing...)
在 2024-10-23 18:22,Linux regression tracking (Thorsten Leemhuis) 写道:
> On 23.10.24 12:09, Frederic Weisbecker wrote:
>> Le Wed, Oct 23, 2024 at 10:27:18AM +0200, Linux regression tracking
>> (Thorsten Leemhuis) a écrit :
>>> Hi, Thorsten here, the Linux kernel's regression tracker.
>>>
>>> Frederic, I noticed a report about a regression in
>>> bugzilla.kernel.org
>>> that appears to be caused by the following change of yours:
>>>
>>> 55d4669ef1b768 ("rcu: Fix rcu_barrier() VS post CPUHP_TEARDOWN_CPU
>>> invocation")
>
>> Are you sure about the commit? Below it says:
>
> Not totally, but...
>
>>> As many (most?) kernel developers don't keep an eye on the bug
>>> tracker,
>>> I decided to write this mail. To quote from
>>> https://bugzilla.kernel.org/show_bug.cgi?id=219390:
>>>
>>>> Mingcong Bai 2024-10-15 13:32:35 UTC
>>>>
>>>> Since aa162aa4aa383a0a714b1c36e8fcc77612ddd1a2 between v6.10.4 and
>>
>> Now that's aa162aa4aa383a0a714b1c36e8fcc77612ddd1a2 which I can't find
>> in vanilla
>> tree.
>
> ...quite, as that is the commit-id of the backport to v6.10.5; and the
> reporter reverted it there. Ideally of course that would have happened
> on recent mainline. If you doubt, ask Mingcong Bai to check if a revert
> there helps, too.
Do we need any further information/testing on this issue? Please let me
know if there's anything we can do as the issue still persists in 6.12.
Best Regards,
Mingcong Bai
>
> HTH, Ciao, Thorsten
>
>> Also I'm failing to see an immediate issue between the below
>> stacktrace
>> and the above commit. So are we sure about that reference?
>>
>> Thanks.
>>
>>
>>>> v6.10.5, the Broadcom Tigon3 Ethernet interface (tg3) found on Apple
>>>> MacBook Pro (15'', Mid 2010) would throw many rcu stall errors
>>>> during
>>>> boot up, causing peripherals such as the wireless card to misbehave:
>>>>
>>>> [ 24.153855] rcu: INFO: rcu_preempt detected expedited stalls on
>>>> CPUs/tasks: { 2-.... } 21 jiffies s: 973 root: 0x4/.
>>>> [ 24.166938] rcu: blocking rcu_node structures (internal RCU
>>>> debug):
>>>> [ 24.177800] Sending NMI from CPU 3 to CPUs 2:
>>>> [ 24.183113] NMI backtrace for cpu 2
>>>> [ 24.183119] CPU: 2 PID: 1049 Comm: NetworkManager Not tainted
>>>> 6.10.5-aosc-main #1
>>>> [ 24.183123] Hardware name: Apple Inc. MacBookPro6,2/Mac-F22586C8,
>>>> BIOS MBP61.88Z.005D.B00.1804100943 04/10/18
>>>> [ 24.183125] RIP: 0010:__this_module+0x2d3d1/0x4f310 [tg3]
>>>> [ 24.183135] Code: c3 cc cc cc cc 0f 1f 40 00 90 90 90 90 90 90 90
>>>> 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 89 f6 48 03 77
>>>> 30 8b 06 <31> f6 31 ff c3 cc cc cc cc 66 0f 1f 44 00 00 90 90 90 90
>>>> 90 90 90
>>>> [ 24.183138] RSP: 0018:ffffbf1a011d75e8 EFLAGS: 00000082
>>>> [ 24.183141] RAX: 0000000000000000 RBX: ffffa04ec78f8a00 RCX:
>>>> 0000000000000000
>>>> [ 24.183143] RDX: 0000000000000000 RSI: ffffbf1a00fb007c RDI:
>>>> ffffa04ec78f8a00
>>>> [ 24.183145] RBP: 0000000000000b50 R08: 0000000000000000 R09:
>>>> 0000000000000000
>>>> [ 24.183147] R10: 0000000000000000 R11: 0000000000000000 R12:
>>>> 0000000000000216
>>>> [ 24.183148] R13: ffffbf1a011d7624 R14: ffffa04ec78f8a08 R15:
>>>> ffffa04ec78f8b40
>>>> [ 24.183151] FS: 00007f4c524b2140(0000) GS:ffffa05007d00000(0000)
>>>> knlGS:0000000000000000
>>>> [ 24.183153] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>> [ 24.183155] CR2: 00007f7025eae3e8 CR3: 00000001040f8000 CR4:
>>>> 00000000000006f0
>>>> [ 24.183157] Call Trace:
>>>> [ 24.183162] <NMI>
>>>> [ 24.183167] ? nmi_cpu_backtrace+0xbf/0x140
>>>> [ 24.183175] ? nmi_cpu_backtrace_handler+0x11/0x20
>>>> [ 24.183181] ? nmi_handle+0x61/0x160
>>>> [ 24.183186] ? default_do_nmi+0x42/0x110
>>>> [ 24.183191] ? exc_nmi+0x1bd/0x290
>>>> [ 24.183194] ? end_repeat_nmi+0xf/0x53
>>>> [ 24.183203] ? __this_module+0x2d3d1/0x4f310 [tg3]
>>>> [ 24.183207] ? __this_module+0x2d3d1/0x4f310 [tg3]
>>>> [ 24.183210] ? __this_module+0x2d3d1/0x4f310 [tg3]
>>>> [ 24.183213] </NMI>
>>>> [ 24.183214] <TASK>
>>>> [ 24.183215] __this_module+0x31828/0x4f310 [tg3]
>>>> [ 24.183218] ? __this_module+0x2d390/0x4f310 [tg3]
>>>> [ 24.183221] __this_module+0x398e6/0x4f310 [tg3]
>>>> [ 24.183225] __this_module+0x3baf8/0x4f310 [tg3]
>>>> [ 24.183229] __this_module+0x4733f/0x4f310 [tg3]
>>>> [ 24.183233] ? _raw_spin_unlock_irqrestore+0x25/0x70
>>>> [ 24.183237] ? __this_module+0x398e6/0x4f310 [tg3]
>>>> [ 24.183241] __this_module+0x4b943/0x4f310 [tg3]
>>>> [ 24.183244] ? delay_tsc+0x89/0xf0
>>>> [ 24.183249] ? preempt_count_sub+0x51/0x60
>>>> [ 24.183254] __this_module+0x4be4b/0x4f310 [tg3]
>>>> [ 24.183258] __dev_open+0x103/0x1c0
>>>> [ 24.183265] __dev_change_flags+0x1bd/0x230
>>>> [ 24.183269] ? rtnl_getlink+0x362/0x400
>>>> [ 24.183276] dev_change_flags+0x26/0x70
>>>> [ 24.183280] do_setlink+0xe16/0x11f0
>>>> [ 24.183286] ? __nla_validate_parse+0x61/0xd40
>>>> [ 24.183295] __rtnl_newlink+0x63d/0x9f0
>>>> [ 24.183301] ? kmem_cache_alloc_node_noprof+0x12b/0x360
>>>> [ 24.183308] ? kmalloc_trace_noprof+0x11e/0x350
>>>> [ 24.183312] ? rtnl_newlink+0x2e/0x70
>>>> [ 24.183316] rtnl_newlink+0x47/0x70
>>>> [ 24.183320] rtnetlink_rcv_msg+0x152/0x400
>>>> [ 24.183324] ? __netlink_sendskb+0x68/0x90
>>>> [ 24.183329] ? netlink_unicast+0x237/0x290
>>>> [ 24.183333] ? __pfx_rtnetlink_rcv_msg+0x10/0x10
>>>> [ 24.183336] netlink_rcv_skb+0x5b/0x110
>>>> [ 24.183343] netlink_unicast+0x1a4/0x290
>>>> [ 24.183347] netlink_sendmsg+0x222/0x4a0
>>>> [ 24.183350] ? proc_get_long.constprop.0+0x116/0x210
>>>> [ 24.183358] ____sys_sendmsg+0x379/0x3b0
>>>> [ 24.183363] ? copy_msghdr_from_user+0x6d/0xb0
>>>> [ 24.183368] ___sys_sendmsg+0x86/0xe0
>>>> [ 24.183372] ? addrconf_sysctl_forward+0xf3/0x270
>>>> [ 24.183378] ? _copy_from_iter+0x8b/0x570
>>>> [ 24.183384] ? __pfx_addrconf_sysctl_forward+0x10/0x10
>>>> [ 24.183388] ? _raw_spin_unlock+0x19/0x50
>>>> [ 24.183392] ? proc_sys_call_handler+0xf3/0x2f0
>>>> [ 24.183397] ? trace_hardirqs_on+0x29/0x90
>>>> [ 24.183401] ? __fdget+0xc2/0xf0
>>>> [ 24.183405] __sys_sendmsg+0x5b/0xc0
>>>> [ 24.183410] ? syscall_trace_enter+0x110/0x1b0
>>>> [ 24.183416] do_syscall_64+0x64/0x150
>>>> [ 24.183423] entry_SYSCALL_64_after_hwframe+0x76/0x7e
>>>>
>>>> I have bisected the error to this commit. Reverting it caused no new
>>>> or
>>>> perceivable issues on both the MacBook and a Zen4-based laptop.
>>>
>>> [...]
>>>
>>>>> Ohh, and when you say "causing peripherals such as the wireless
>>>>> card to
>>>>> misbehave" what exactly do you mean?
>>>>
>>>> When the kernel throws rcu stall messages, the wireless card on the
>>>> MacBook may fail to discover and/or connect to wireless networks -
>>>> not a
>>>> consistent behaviour but I suppose that something in the kernel got
>>>> stuck.
>>>
>>> See the ticket for more details and dmesg logs; the problem still
>>> happens with 6.12-rc. The reporter is CCed.
>>>
>>> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker'
>>> hat)
>>> --
>>> Everything you wanna know about Linux kernel regression tracking:
>>> https://linux-regtracking.leemhuis.info/about/#tldr
>>> If I did something stupid, please tell me, as explained on that page.
>>>
>>> P.S.: let me use this mail to also add the report to the list of
>>> tracked
>>> regressions to ensure it's doesn't fall through the cracks:
>>>
>>> #regzbot introduced: 55d4669ef1b76823083caecfab12a8bd2ccdcf64
>>> #regzbot from: Mingcong Bai <jeffbai@...c.io>
>>> #regzbot duplicate:
>>> https://bugzilla.kernel.org/show_bug.cgi?id=219390
>>> #regzbot title: rcu: wifi problems since tg3 started throwing rcu
>>> stall
>>> warnings
>>> #regzbot ignore-activity
>>>
>>
>>
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