> CC: "Johannes Weiner" <hannes@xxxxxxxxxxx>, "Andrew Morton" <akpm@xxxxxxxxxxxxxxxxxxxx>, "David Rientjes" <rientjes@xxxxxxxxxx>, "KAMEZAWA Hiroyuki" <kamezawa.hiroyu@xxxxxxxxxxxxxx>, "KOSAKI Motohiro" <kosaki.motohiro@xxxxxxxxxxxxxx>, linux-mm@xxxxxxxxx, cgroups@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx >On Tue 17-09-13 13:15:35, azurIt wrote: >[...] >> Is something unusual on this stack? >> >> >> [<ffffffff810d1a5e>] dump_header+0x7e/0x1e0 >> [<ffffffff810d195f>] ? find_lock_task_mm+0x2f/0x70 >> [<ffffffff810d1f25>] oom_kill_process+0x85/0x2a0 >> [<ffffffff810d24a8>] mem_cgroup_out_of_memory+0xa8/0xf0 >> [<ffffffff8110fb76>] mem_cgroup_oom_synchronize+0x2e6/0x310 >> [<ffffffff8110efc0>] ? mem_cgroup_uncharge_page+0x40/0x40 >> [<ffffffff810d2703>] pagefault_out_of_memory+0x13/0x130 >> [<ffffffff81026f6e>] mm_fault_error+0x9e/0x150 >> [<ffffffff81027424>] do_page_fault+0x404/0x490 >> [<ffffffff810f952c>] ? do_mmap_pgoff+0x3dc/0x430 >> [<ffffffff815cb87f>] page_fault+0x1f/0x30 > >This is a regular memcg OOM killer. Which dumps messages about what is >going to do. So no, nothing unusual, except if it was like that for ever >which would mean that oom_kill_process is in the endless loop. But a >single stack doesn't tell us much. > >Just a note. When you see something hogging a cpu and you are not sure >whether it might be in an endless loop inside the kernel it makes sense >to take several snaphosts of the stack trace and see if it changes. If >not and the process is not sleeping (there is no schedule on the trace) >then it might be looping somewhere waiting for Godot. If it is sleeping >then it is slightly harder because you would have to identify what it is >waiting for which requires to know a deeper context. >-- >Michal Hocko >SUSE Labs I was finally able to get stack of problematic process :) I saved it two times from the same process, as Michal suggested (i wasn't able to take more). Here it is: First (doesn't look very helpfull): [<ffffffffffffffff>] 0xffffffffffffffff Second: [<ffffffff810e17d1>] shrink_zone+0x481/0x650 [<ffffffff810e2ade>] do_try_to_free_pages+0xde/0x550 [<ffffffff810e310b>] try_to_free_pages+0x9b/0x120 [<ffffffff81148ccd>] free_more_memory+0x5d/0x60 [<ffffffff8114931d>] __getblk+0x14d/0x2c0 [<ffffffff8114c973>] __bread+0x13/0xc0 [<ffffffff811968a8>] ext3_get_branch+0x98/0x140 [<ffffffff81197497>] ext3_get_blocks_handle+0xd7/0xdc0 [<ffffffff81198244>] ext3_get_block+0xc4/0x120 [<ffffffff81155b8a>] do_mpage_readpage+0x38a/0x690 [<ffffffff81155ffb>] mpage_readpages+0xfb/0x160 [<ffffffff811972bd>] ext3_readpages+0x1d/0x20 [<ffffffff810d9345>] __do_page_cache_readahead+0x1c5/0x270 [<ffffffff810d9411>] ra_submit+0x21/0x30 [<ffffffff810cfb90>] filemap_fault+0x380/0x4f0 [<ffffffff810ef908>] __do_fault+0x78/0x5a0 [<ffffffff810f2b24>] handle_pte_fault+0x84/0x940 [<ffffffff810f354a>] handle_mm_fault+0x16a/0x320 [<ffffffff8102715b>] do_page_fault+0x13b/0x490 [<ffffffff815cb87f>] page_fault+0x1f/0x30 [<ffffffffffffffff>] 0xffffffffffffffff What do you think about it? azur -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>