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From: Catalin Marinas <catalin.marinas@arm.com>
To: Qian Cai <cai@lca.pw>
Cc: bp@alien8.de, tglx@linutronix.de, mingo@redhat.com,
	dave.hansen@linux.intel.com, luto@kernel.org,
	peterz@infradead.org, x86@kernel.org,
	linux-kernel@vger.kernel.org, brijesh.singh@amd.com
Subject: Re: [PATCH] x86/mm: fix a crash with kmemleak_scan()
Date: Wed, 24 Apr 2019 09:08:43 +0100	[thread overview]
Message-ID: <20190424080842.wjo2aj3g4sy4rkz7@mbp> (raw)
In-Reply-To: <20190423165811.36699-1-cai@lca.pw>

On Tue, Apr 23, 2019 at 12:58:11PM -0400, Qian Cai wrote:
> The first kmemleak_scan() after boot would trigger a crash below because
> 
> kernel_init
>   free_initmem
>     mem_encrypt_free_decrypted_mem
>       free_init_pages
> 
> unmapped some memory inside the .bss with DEBUG_PAGEALLOC=y. Since
> kmemleak_init() will register the .data/.bss sections (only register
> .data..ro_after_init if not within .data) and then kmemleak_scan() will
> scan those address and dereference them looking for pointer referencing.
> If free_init_pages() free and unmap pages in those sections,
> kmemleak_scan() will trigger a crash if referencing one of those
> addresses.
> 
> BUG: unable to handle kernel paging request at ffffffffbd402000
> CPU: 12 PID: 325 Comm: kmemleak Not tainted 5.1.0-rc4+ #4
> RIP: 0010:scan_block+0x58/0x160
> Call Trace:
>  scan_gray_list+0x1d9/0x280
>  kmemleak_scan+0x485/0xad0
>  kmemleak_scan_thread+0x9f/0xc4
>  kthread+0x1d2/0x1f0
>  ret_from_fork+0x35/0x40
> 
> Since kmemleak_free_part() is tolerant to unknown objects (not tracked by
> kmemleak), it is fine to call it from free_init_pages() even if not all
> address ranges passed to this function are known to kmemleak.
> 
> Signed-off-by: Qian Cai <cai@lca.pw>

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>

  reply	other threads:[~2019-04-24  8:08 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-23 16:58 Qian Cai
2019-04-24  8:08 ` Catalin Marinas [this message]
2019-04-24  9:46 ` [tip:x86/urgent] x86/mm: Fix " tip-bot for Qian Cai

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