tree f5e47aea84b3cbd12e54dabb9e9b3bb3a422f455
parent f57448d44b6b96c6e658a0a04f67ffe0cb0cdb1f
author Darrick J. Wong <djwong@kernel.org> 1744161128 -0700
committer Darrick J. Wong <djwong@kernel.org> 1745532104 -0700

bdev: fix weird crash

Fix this by constricting max folio order?

BUG: sleeping function called from invalid context at mm/util.c:743   
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 35, name: kcompactd0
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
Preemption disabled at:
[<fffffe0080339c98>] __buffer_migrate_folio+0xb8/0x2d0
CPU: 0 UID: 0 PID: 35 Comm: kcompactd0 Not tainted 6.15.0-rc1-acha #rc1 PREEMPT
Hardware name: QEMU KVM Virtual Machine, BIOS 1.6.6 08/22/2023
Call trace:
 show_stack+0x20/0x38 (C)
 dump_stack_lvl+0x78/0x90
 dump_stack+0x18/0x28
 __might_resched+0x164/0x1d0
 folio_mc_copy+0x5c/0xa0
 __migrate_folio.constprop.0+0x70/0x1c8
 __buffer_migrate_folio+0x2bc/0x2d0
 buffer_migrate_folio_norefs+0x1c/0x30
 move_to_new_folio+0x70/0x1f0
 migrate_pages_batch+0x9c4/0xf20
 migrate_pages+0xb74/0xde8
 compact_zone+0x9ac/0xff0
 compact_node+0x9c/0x1a0
 kcompactd+0x38c/0x400
 kthread+0x144/0x210
 ret_from_fork+0x10/0x20


Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>