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Wong" , Qu Wenruo Cc: Linux Memory Management List , linux-btrfs References: <20250421172906.GA25651@frogsfrogsfrogs> Content-Language: en-US From: Qu Wenruo Autocrypt: addr=quwenruo.btrfs@gmx.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNIlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT7CwJQEEwEIAD4CGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCZxF1YAUJEP5a sQAKCRDCPZHzoSX+qF+mB/9gXu9C3BV0omDZBDWevJHxpWpOwQ8DxZEbk9b9LcrQlWdhFhyn xi+l5lRziV9ZGyYXp7N35a9t7GQJndMCFUWYoEa+1NCuxDs6bslfrCaGEGG/+wd6oIPb85xo naxnQ+SQtYLUFbU77WkUPaaIU8hH2BAfn9ZSDX9lIxheQE8ZYGGmo4wYpnN7/hSXALD7+oun 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Wong =E5=86=99=E9=81=93: > On Sun, Apr 20, 2025 at 08:24:12PM +0930, Qu Wenruo wrote: >> 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]=3DWARN, [O]=3DOOT_MODULE, [E]=3DUNSIGNED_M= ODULE >> [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@goog= le.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) >=20 > Doesn't matter; the block device can create large folios in its page > cache and blkid reading the bdev can create buffer heads. >=20 > willy's workaround in: > https://lore.kernel.org/linux-fsdevel/Z_VwF1MA-R7MgDVG@casper.infradead.= org/ Thanks a lot for the info. However this also makes me wonder, what if the block size of the block=20 device eventually go larger than page size? E.g. I know some vendors (samsumg?) are pushing for larger block size,=20 with that the minimal order will still be larger than page size. Thus I guess we can not avoid it anyway? Thanks, Qu >=20 > works enough to make this go away. >=20 > --D >=20 >> >> - 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 >> >=20