Re: struct pid memory leak

On Sat, Jan 23, 2016 at 7:00 PM, Willy Tarreau [off-list ref] wrote:

Hi Eric, Dmitry,

On Fri, Jan 22, 2016 at 08:50:01AM -0800, Eric Dumazet wrote:

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CC netdev, as it looks some af_unix issue ...

On Fri, 2016-01-22 at 16:08 +0100, Dmitry Vyukov wrote:

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Hello,

The following program causes struct pid memory leak:

// autogenerated by syzkaller (http://github.com/google/syzkaller)

(...)

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unreferenced object 0xffff8800324af200 (size 112):
  comm "syz-executor", pid 18413, jiffies 4295500287 (age 14.321s)
  hex dump (first 32 bytes):
    01 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff86315673>] kmemleak_alloc+0x63/0xa0 mm/kmemleak.c:916
    [<     inline     >] kmemleak_alloc_recursive include/linux/kmemleak.h:47

(...)

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On commit 30f05309bde49295e02e45c7e615f73aa4e0ccc2 (Jan 20).

I can't reproduce this with the indicated commit. I'm unsure how/what
I'm supposed to see. Is a certain config needed ? I've enabled kmemleak
in my .config but there are too few information here to go further
unfortunately.

Hi Willy,

I've attached my .config.
Also run this program in a parallel loop. I think it's leaking not
every time, probably some race is involved.