The patch titled
Subject: mm: vmalloc: replace BUG_ON() by WARN_ON_ONCE()
has been added to the -mm mm-unstable branch. Its filename is
mm-vmalloc-replace-bug_on-by-warn_on_once.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-replace-bug_on-by-warn_on_once.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Uladzislau Rezki (Sony)" <urezki@xxxxxxxxx>
Subject: mm: vmalloc: replace BUG_ON() by WARN_ON_ONCE()
Date: Thu, 22 Dec 2022 20:00:22 +0100
Currently a vm_unmap_ram() functions triggers a BUG() if an area is not
found. Replace it by the WARN_ON_ONCE() error message and keep machine
alive instead of stopping it.
The worst case is a memory leaking.
Link: https://lkml.kernel.org/r/20221222190022.134380-3-urezki@xxxxxxxxx
Signed-off-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Reviewed-by: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@xxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/vmalloc.c~mm-vmalloc-replace-bug_on-by-warn_on_once
+++ a/mm/vmalloc.c
@@ -2253,7 +2253,9 @@ void vm_unmap_ram(const void *mem, unsig
}
va = find_unlink_vmap_area(addr);
- BUG_ON(!va);
+ if (WARN_ON_ONCE(!va))
+ return;
+
debug_check_no_locks_freed((void *)va->va_start,
(va->va_end - va->va_start));
free_unmap_vmap_area(va);
_
Patches currently in -mm which might be from urezki@xxxxxxxxx are
mm-vmalloc-avoid-calling-__find_vmap_area-twice-in-__vunmap.patch
mm-vmalloc-switch-to-find_unlink_vmap_area-in-vm_unmap_ram.patch
mm-vmalloc-replace-bug_on-by-warn_on_once.patch
