linux-kernel - Re: [PATCH 3/3] mm: catch memory commitment underflow

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Date:	Sun, 18 Jan 2015 06:34:10 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Konstantin Khlebnikov <koct9i@...il.com>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	Dave Hansen <dave.hansen@...el.com>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH 3/3] mm: catch memory commitment underflow

On 06/24/2014 04:16 PM, Konstantin Khlebnikov wrote:
> This patch prints warning (if CONFIG_DEBUG_VM=y) when
> memory commitment becomes too negative.
> 
> Signed-off-by: Konstantin Khlebnikov <koct9i@...il.com>

Hi Konstantin,

I seem to be hitting this warning when fuzzing on the latest -next kernel:

[  683.674323] ------------[ cut here ]------------
[  683.675552] WARNING: CPU: 12 PID: 25654 at mm/mmap.c:157 __vm_enough_memory+0x1b7/0x1d0()
[  683.676972] memory commitment underflow
[  683.678212] Modules linked in:
[  683.678219] CPU: 12 PID: 25654 Comm: trinity-c373 Not tainted 3.19.0-rc4-next-20150116-sasha-00054-g4ad498c-dirty #1744
[  683.678227]  ffffffff9c6f7e73 ffff8802c0883a58 ffffffff9b439fb2 0000000000000000
[  683.678231]  ffff8802c0883aa8 ffff8802c0883a98 ffffffff98159e1a ffff8802c0883ae8
[  683.678236]  0000000000000001 0000000000000000 ffffffffffff76f1 ffff8802a9749000
[  683.678243] Call Trace:
[  683.678288] dump_stack (lib/dump_stack.c:52)
[  683.678297] warn_slowpath_common (kernel/panic.c:447)
[  683.678302] warn_slowpath_fmt (kernel/panic.c:461)
[  683.678307] __vm_enough_memory (mm/mmap.c:157 (discriminator 3))
[  683.678317] cap_vm_enough_memory (security/commoncap.c:958)
[  683.678323] security_vm_enough_memory_mm (security/security.c:212)
[  683.678331] shmem_getpage_gfp (mm/shmem.c:1161)
[  683.678337] shmem_write_begin (mm/shmem.c:1495)
[  683.678343] generic_perform_write (mm/filemap.c:2491)
[  683.678447] __generic_file_write_iter (mm/filemap.c:2632)
[  683.678452] generic_file_write_iter (mm/filemap.c:2659)
[  683.678458] do_iter_readv_writev (fs/read_write.c:680)
[  683.678461] do_readv_writev (fs/read_write.c:848)
[  683.678512] vfs_writev (fs/read_write.c:893)
[  683.678515] SyS_writev (fs/read_write.c:926 fs/read_write.c:917)
[  683.678520] tracesys_phase2 (arch/x86/kernel/entry_64.S:529)


Thanks,
Sasha
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