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However, in_interrupt() also reports true when BH are disabled. The bridge code can call rhashtable_lookup_insert_fast() with bottom halves disabled: __vlan_add() -> br_fdb_add_local() spin_lock_bh(&br->hash_lock); <-- Disable BH -> fdb_add_local() -> fdb_create() -> rhashtable_lookup_insert_fast() -> kvmalloc() -> vmalloc() -> __get_vm_area_node() -> BUG_ON(in_interrupt()) spin_unlock_bh(&br->hash_lock) this triggers the BUG() despite the caller not being in NMI or hard IRQ context. Replace the in_interrupt() check with in_nmi() || in_hardirq(). Cc: Ido Schimmel Fixes: c6307674ed82 ("mm: kvmalloc: add non-blocking support for vmalloc") Reported-by: syzbot+8b12fc6e0fb139765b58@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/69ff8c7c.050a0220.1036b8.000b.GAE@googl= e.com/ Signed-off-by: Uladzislau Rezki (Sony) Reviewed-by: Baoquan He --- mm/vmalloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 676851d5cfe7..273bbe49eaef 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -3209,7 +3209,7 @@ struct vm_struct *__get_vm_area_node(unsigned long si= ze, struct vm_struct *area; unsigned long requested_size =3D size; =20 - BUG_ON(in_interrupt()); + BUG_ON(in_nmi() || in_hardirq()); size =3D ALIGN(size, 1ul << shift); if (unlikely(!size)) return NULL; --=20 2.47.3