lkml.org 
[lkml]   [2021]   [Jul]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2] mm/page_alloc: Fix sleeping function called in case of irqsdisable
On Tue, Jul 06, 2021 at 03:57:54PM +0800, qiang.zhang@windriver.com wrote:
> From: Zqiang <qiang.zhang@windriver.com>
>
> BUG: sleeping function called from invalid context at mm/page_alloc.c:5179
> in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 1, name: swapper/0
> .....
> __dump_stack lib/dump_stack.c:79 [inline]
> dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:96
> ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:9153
> prepare_alloc_pages+0x3da/0x580 mm/page_alloc.c:5179
> __alloc_pages+0x12f/0x500 mm/page_alloc.c:5375
> alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2147
> alloc_pages+0x238/0x2a0 mm/mempolicy.c:2270
> stack_depot_save+0x39d/0x4e0 lib/stackdepot.c:303
> save_stack+0x15e/0x1e0 mm/page_owner.c:120
> __set_page_owner+0x50/0x290 mm/page_owner.c:181
> prep_new_page mm/page_alloc.c:2445 [inline]
> __alloc_pages_bulk+0x8b9/0x1870 mm/page_alloc.c:5313
> alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline]
> vm_area_alloc_pages mm/vmalloc.c:2775 [inline]
> __vmalloc_area_node mm/vmalloc.c:2845 [inline]
> __vmalloc_node_range+0x39d/0x960 mm/vmalloc.c:2947
> __vmalloc_node mm/vmalloc.c:2996 [inline]
> vzalloc+0x67/0x80 mm/vmalloc.c:3066
>
> If the PAGE_OWNER is enabled, in __set_page_owner(), the pages will be
> allocated to save calltrace info, due to the allocated action is executed
> under irq disable(pagesets.lock be held), if the gfp variable contains
> the flag that causes sleep, will trigger above information. the
> prep_new_page() is not need to disable irq for protection, fix it through
> enable irq before call prep_new_page().
>
> Fixes: 0f87d9d30f21 ("mm/page_alloc: add an array-based interface to the bulk page allocator")
> Reported-by: syzbot+0123a2b8f9e623d5b443@syzkaller.appspotmail.com
> Suggested-by: Muchun Song <songmuchun@bytedance.com>
> Signed-off-by: Zqiang <qiang.zhang@windriver.com>

Same comment as v1 with respect to the impact of enabling/disabling IRQs
for each page allocated -- it hurts performance regardless of whether
page owner is enabled or not. If returning a single page is undesirable
then a slightly different alternative is to only enable IRQs if page
owner is set and then goto "Attempt the batch allocation" to reacquire
the lock and lookup pcp.

--
Mel Gorman
SUSE Labs

\
 
 \ /
  Last update: 2021-07-06 10:34    [W:0.091 / U:0.164 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site