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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