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McKenney" , Josh Triplett , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Joel Fernandes , rcu@vger.kernel.org, Andrew Morton , linux-mm@kvack.org References: <2245518.LNIG0phfVR@natalenko.name> <6698965.kvI7vG0SvZ@natalenko.name> From: Chris Clayton Message-ID: Date: Sun, 18 Jul 2021 22:36:36 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-GB X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: C4AF150000A2 X-Stat-Signature: 6arshpi9subfw8qbc45trpgc8rinbp5x Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=googlemail.com header.s=20161025 header.b=tbcNiPA0; dmarc=pass (policy=quarantine) header.from=googlemail.com; spf=pass (imf04.hostedemail.com: domain of chris2553@googlemail.com designates 209.85.128.54 as permitted sender) smtp.mailfrom=chris2553@googlemail.com X-HE-Tag: 1626644201-113669 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 18/07/2021 22:22, Matthew Wilcox wrote: > On Sun, Jul 18, 2021 at 11:03:51PM +0200, Oleksandr Natalenko wrote: >> + stable@vger.kernel.org >> >> On ned=C4=9Ble 18. =C4=8Dervence 2021 23:01:24 CEST Oleksandr Natalenk= o wrote: >>> Hello. >>> >>> On sobota 17. =C4=8Dervence 2021 22:22:08 CEST Chris Clayton wrote: >>>> I checked the output from dmesg yesterday and found the following wa= rning: >>>> >>>> [Fri Jul 16 09:15:29 2021] ------------[ cut here ]------------ >>>> [Fri Jul 16 09:15:29 2021] WARNING: CPU: 11 PID: 2701 at >>>> kernel/rcu/tree_plugin.h:359 rcu_note_context_switch+0x37/0x3d0 [Fri= Jul >=20 > Could you run ./scripts/faddr2line vmlinux rcu_note_context_switch+0x37= /0x3d0 >=20 $ ./scripts/faddr2line vmlinux rcu_note_context_switch+0x37/0x3d0 rcu_note_context_switch+0x37/0x3d0: rcu_note_context_switch at ??:? >>>> [Fri Jul 16 09:15:29 2021] Call Trace: >>>> [Fri Jul 16 09:15:29 2021] __schedule+0x86/0x810 >>>> [Fri Jul 16 09:15:29 2021] schedule+0x40/0xe0 >>>> [Fri Jul 16 09:15:29 2021] io_schedule+0x3d/0x60 >>>> [Fri Jul 16 09:15:29 2021] wait_on_page_bit_common+0x129/0x390 >>>> [Fri Jul 16 09:15:29 2021] ? __filemap_set_wb_err+0x10/0x10 >>>> [Fri Jul 16 09:15:29 2021] __lock_page_or_retry+0x13f/0x1d0 >>>> [Fri Jul 16 09:15:29 2021] do_swap_page+0x335/0x5b0 >>>> [Fri Jul 16 09:15:29 2021] __handle_mm_fault+0x444/0xb20 >>>> [Fri Jul 16 09:15:29 2021] handle_mm_fault+0x5c/0x170 >=20 > You were handling a page fault at the time. The page you wanted was > on swap and this warning fired as a result of waiting for the page > to come back in from swap. There are a number of warnings in that > function, so it'd be good to track down exactly which one it is. >=20