From: Jia-Ju Bai <baijiaju1990@163.com>
To: akpm@linux-foundation.org, mhocko@suse.com, mingo@kernel.org,
catalin.marinas@arm.com, labbott@redhat.com, thgarnie@google.com,
kirill.shutemov@linux.intel.com, aryabinin@virtuozzo.com,
ard.biesheuvel@linaro.org, zijun_hu@htc.com
Cc: linux-mm@kvack.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: [BUG] mm/vmalloc: ___might_sleep is called under a spinlock in __purge_vmap_area_lazy
Date: Mon, 9 Oct 2017 12:00:33 +0800 [thread overview]
Message-ID: <70f9850a-b24c-8595-8a22-9b47e96d6338@163.com> (raw)
The ___might_sleep is called under a spinlock, and the function call
graph is:
__purge_vmap_area_lazy (acquire the spinlock)
cond_resched_lock
___might_sleep
In this situation, ___might_sleep may prints error log message because a
spinlock is held.
A possible fix is to remove ___might_sleep in cond_resched_lock.
This bug is found by my static analysis tool and my code review.
Thanks,
Jia-Ju Bai
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next reply other threads:[~2017-10-09 4:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-09 4:00 Jia-Ju Bai [this message]
2017-10-09 4:10 ` Kirill A. Shutemov
2017-10-09 4:48 ` Jia-Ju Bai
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