Messages in this thread | | | Subject | mm_alloc()'ed structure leak | From | Catalin Marinas <> | Date | Mon, 09 Feb 2009 12:18:18 +0000 |
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Hi,
I've noticed on recent kernels (currently 2.6.29-rc3) a memory leak reported by kmemleak for an mm_struct allocated in mm_alloc(). If that's a valid leak, it is a pretty serious one.
Basically bash forks and executes a command like "host kernel.org" which finishes normally but the corresponding mm_struct isn't freed (I get this consistently every time I run the above command):
unreferenced object 0xcfed4070 (size 368): comm "bash", pid 1674, jiffies 421592 backtrace: [<c0082bd4>] kmemleak_alloc+0x140/0x2b0 [<c007ff2c>] kmem_cache_alloc+0xd0/0x100 [<c0036980>] mm_alloc+0x14/0x44 [<c008a99c>] bprm_mm_init+0xc/0x13c [<c008ab70>] do_execve+0xa4/0x218 [<c002718c>] sys_execve+0x34/0x54 [<c0023e80>] ret_fast_syscall+0x0/0x28
I can't figure out why this structure isn't freed, so any help is welcomed before I start bisecting. The platform is an ARM one but the code in question is probably generic.
Thanks.
-- Catalin
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