On Tue, Jul 25, 2017 at 7:29 PM, Yubin Ruan <ablacktsh...@gmail.com> wrote:
> 2017-07-25 17:59 GMT+08:00 Rock Lee <rockdot...@gmail.com>: > > Hi, > > > > I was using a program to test OOM killer, but OOM killer hung my board. > The > > test snippet is very simple, just malloc() without free(). > > > > 6 int i=0; > > 7 char *ptrtest=NULL; > > 8 while (1) > > 9 { > > 10 ptrtest = malloc(0x1000); > > 11 if (ptrtest == NULL) > > 12 printf("malloc failed.\n"); > > 13 } > > 14 return 0; > > 15 > > > > After I executed this program(a.out), there is no reaction of my shell. > Only > > this messege was shown: > > > > [ 180.138188] Out of memory: Kill process 2706 (qq) score 623 or > sacrifice > > child > > [ 180.164230] Killed process 2706 (qq) total-vm:98156kB, > anon-rss:96400kB, > > file-rss:4kB > > > > I think it must be some problem with OOM killer, and tried a lot of way > to > > get some infomation. And I got this: > > > > ======================================================= > > Process: a.out, cpu: 0 pid: 1463 start: 0xd5849b00 > > ===================================================== > > Task name: a.out pid: 1463 cpu: 0 > > state: 0x2 exit_state: 0x0 stack base: 0xd6190000 > > Stack: > > [<c08394e4>] __schedule+0x2c8 > > [<c018df88>] squashfs_cache_get+0x108 > > [<c0191020>] squashfs_readpage_block+0x28 > > [<c018f648>] squashfs_readpage+0x624 > > [<c0090d4c>] __do_page_cache_readahead+0x228 > > [<c00882f4>] filemap_fault+0x1d4 > > [<c00a5f10>] __do_fault+0x34 > > [<c00a8ab0>] do_read_fault+0x19c > > [<c00a9388>] handle_mm_fault+0x468 > > [<c00164b0>] do_page_fault+0x11c > > [<c00084a4>] do_PrefetchAbort+0x34 > > [<c0011c1c>] ret_from_exception+0x0 > > > > I am suprised, because a.out is in /tmp, there is no relation between > a.out > > and squashfs(my rootfs). Could anyone give me a hint ? Is the problem of > > squashfs or OOM killer. > > You say your rootfs is squashfs filesystem. Is /tmp using the same > device and same filesystem (i.e., squashfs) ? Not exactly, /tmp uses tmpfs, but my rootfs uses squashfs. -- Cheers, Rock
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