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[2403:580d:fda1::299]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-73dbfab289asm4527999b3a.153.2025.04.20.03.54.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 20 Apr 2025 03:54:15 -0700 (PDT) Message-ID: Date: Sun, 20 Apr 2025 20:24:12 +0930 Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: Linux Memory Management List , linux-btrfs From: Qu Wenruo Subject: Sleep inside atomic for aarch64, triggered by generic/482 Autocrypt: addr=wqu@suse.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNGFF1IFdlbnJ1byA8d3F1QHN1c2UuY29tPsLAlAQTAQgAPgIbAwULCQgHAgYVCAkKCwIE FgIDAQIeAQIXgBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXVgBQkQ/lqxAAoJEMI9kfOh Jf6o+jIH/2KhFmyOw4XWAYbnnijuYqb/obGae8HhcJO2KIGcxbsinK+KQFTSZnkFxnbsQ+VY fvtWBHGt8WfHcNmfjdejmy9si2jyy8smQV2jiB60a8iqQXGmsrkuR+AM2V360oEbMF3gVvim 2VSX2IiW9KERuhifjseNV1HLk0SHw5NnXiWh1THTqtvFFY+CwnLN2GqiMaSLF6gATW05/sEd V17MdI1z4+WSk7D57FlLjp50F3ow2WJtXwG8yG8d6S40dytZpH9iFuk12Sbg7lrtQxPPOIEU rpmZLfCNJJoZj603613w/M8EiZw6MohzikTWcFc55RLYJPBWQ+9puZtx1DopW2jOwE0EWdWB rwEIAKpT62HgSzL9zwGe+WIUCMB+nOEjXAfvoUPUwk+YCEDcOdfkkM5FyBoJs8TCEuPXGXBO Cl5P5B8OYYnkHkGWutAVlUTV8KESOIm/KJIA7jJA+Ss9VhMjtePfgWexw+P8itFRSRrrwyUf E+0WcAevblUi45LjWWZgpg3A80tHP0iToOZ5MbdYk7YFBE29cDSleskfV80ZKxFv6koQocq0 vXzTfHvXNDELAuH7Ms/WJcdUzmPyBf3Oq6mKBBH8J6XZc9LjjNZwNbyvsHSrV5bgmu/THX2n g/3be+iqf6OggCiy3I1NSMJ5KtR0q2H2Nx2Vqb1fYPOID8McMV9Ll6rh8S8AEQEAAcLAfAQY AQgAJgIbDBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXWBBQkQ/lrSAAoJEMI9kfOhJf6o cakH+QHwDszsoYvmrNq36MFGgvAHRjdlrHRBa4A1V1kzd4kOUokongcrOOgHY9yfglcvZqlJ qfa4l+1oxs1BvCi29psteQTtw+memmcGruKi+YHD7793zNCMtAtYidDmQ2pWaLfqSaryjlzR /3tBWMyvIeWZKURnZbBzWRREB7iWxEbZ014B3gICqZPDRwwitHpH8Om3eZr7ygZck6bBa4MU o1XgbZcspyCGqu1xF/bMAY2iCDcq6ULKQceuKkbeQ8qxvt9hVxJC2W3lHq8dlK1pkHPDg9wO JoAXek8MF37R8gpLoGWl41FIUb3hFiu3zhDDvslYM4BmzI18QgQTQnotJH8= Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi, Recently I hit two dmesg reports from generic/482, on aarch64 64K page size with 4K fs block size. The involved warning looks like this: 117645.139610] BTRFS info (device dm-13): using free-space-tree [117645.146707] BTRFS info (device dm-13): start tree-log replay [117645.158598] BTRFS info (device dm-13): last unmount of filesystem 214efad4-5c63-49b6-ad29-f09c4966de33 [117645.322288] BUG: sleeping function called from invalid context at mm/util.c:743 [117645.322312] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 46, name: kcompactd0 [117645.322325] preempt_count: 1, expected: 0 [117645.322329] RCU nest depth: 0, expected: 0 [117645.322338] CPU: 3 UID: 0 PID: 46 Comm: kcompactd0 Tainted: G W OE 6.15.0-rc2-custom+ #116 PREEMPT(voluntary) [117645.322343] Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE [117645.322345] Hardware name: QEMU KVM Virtual Machine, BIOS unknown 2/2/2022 [117645.322347] Call trace: [117645.322349] show_stack+0x34/0x98 (C) [117645.322360] dump_stack_lvl+0x60/0x80 [117645.322366] dump_stack+0x18/0x24 [117645.322370] __might_resched+0x130/0x168 [117645.322375] folio_mc_copy+0x54/0xa8 [117645.322382] __migrate_folio.isra.0+0x5c/0x1f8 [117645.322387] __buffer_migrate_folio+0x28c/0x2a0 [117645.322391] buffer_migrate_folio_norefs+0x1c/0x30 [117645.322395] move_to_new_folio+0x94/0x2c0 [117645.322398] migrate_pages_batch+0x7e4/0xd10 [117645.322402] migrate_pages_sync+0x88/0x240 [117645.322405] migrate_pages+0x4d0/0x660 [117645.322409] compact_zone+0x454/0x718 [117645.322414] compact_node+0xa4/0x1b8 [117645.322418] kcompactd+0x300/0x458 [117645.322421] kthread+0x11c/0x140 [117645.322426] ret_from_fork+0x10/0x20 [117645.400370] BTRFS: device fsid 214efad4-5c63-49b6-ad29-f09c4966de33 devid 1 transid 31 /dev/mapper/thin-vol.482 (253:13) scanned by mount (924470) [117645.404282] BTRFS info (device dm-13): first mount of filesystem 214efad4-5c63-49b6-ad29-f09c4966de33 Again this has no btrfs involved in the call trace. This looks exactly like the report here: https://lore.kernel.org/linux-mm/67f6e11f.050a0220.25d1c8.000b.GAE@google.com/ However there are something new here: - The target fs is btrfs, no large folio support yet At least the branch I'm testing (based on v6.15-rc2) doesn't support folio. Furthermore since it's btrfs, there is no buffer_head usage involved. (But the rootfs is indeed ext4) - Arm64 64K page size with 4K block size It's less common than x86_64. Fortunately I can reproduce the bug reliable, it takes around 3~10 runs to hit it. Hope this report would help a little. Thanks, Qu