On 01/19/2016 11:29 AM, Tetsuo Handa wrote: > although I > couldn't find evidence that mlock() and madvice() are related with this hangup, I simplified reproducer by having only single thread allocating memory when OOM triggers: http://jan.stancek.eu/tmp/oom_hangs/console.log.3-v4.4-8606-with-memalloc.txt In this instance it was mmap + mlock, as you can see from oom call trace. It made it to do_exit(), but couldn't complete it: [19419.667714] oom01 R running task 11568 32704 32676 0x00000084 [19419.675606] 0000000000000000 0000000000000000 ffffffff81c8dfc0 0000000000000007 [19419.683910] ffff88045fbd7ad8 ffff880451c88000 ffff88045aac8000 ffff880456f18000 [19419.692207] ffff88044fb239c0 0000000000000000 ffffffff81205113 ffff880456f17428 [19419.700507] Call Trace: [19419.703235] [<ffffffff8177e8af>] ? _raw_spin_unlock+0x1f/0x40 [19419.709746] [<ffffffff81779207>] ? preempt_schedule_common+0x1f/0x38 [19419.716936] [<ffffffff8177923c>] ? _cond_resched+0x1c/0x30 [19419.723146] [<ffffffff811e7369>] ? shrink_slab.part.42+0x119/0x540 [19419.730141] [<ffffffff81027c59>] ? sched_clock+0x9/0x10 [19419.736070] [<ffffffff811ecc2a>] ? shrink_zone+0x30a/0x330 [19419.742290] [<ffffffff811ecff4>] ? do_try_to_free_pages+0x174/0x440 [19419.749381] [<ffffffff811ed3c0>] ? try_to_free_pages+0x100/0x2c0 [19419.756182] [<ffffffff81269102>] ? __alloc_pages_slowpath+0x278/0x78c [19419.763468] [<ffffffff811dcdb1>] ? __alloc_pages_nodemask+0x4a1/0x4d0 [19419.770755] [<ffffffff810d592c>] ? local_clock+0x1c/0x30 [19419.776782] [<ffffffff8123482e>] ? alloc_pages_vma+0xbe/0x2d0 [19419.783294] [<ffffffff812224d8>] ? __read_swap_cache_async+0x118/0x200 [19419.790666] [<ffffffff812225e6>] ? read_swap_cache_async+0x26/0x60 [19419.797665] [<ffffffff81222785>] ? swapin_readahead+0x165/0x1f0 [19419.804367] [<ffffffff811d0e15>] ? find_get_entry+0x5/0x220 [19419.810686] [<ffffffff811d1c4c>] ? pagecache_get_page+0x2c/0x270 [19419.817487] [<ffffffff810f930a>] ? __lock_acquire+0x2aa/0x1130 [19419.824094] [<ffffffff8120aeac>] ? do_swap_page.isra.61+0x48c/0x830 [19419.831185] [<ffffffff810f51f4>] ? __lock_is_held+0x54/0x70 [19419.837502] [<ffffffff8120d3b9>] ? handle_mm_fault+0xa99/0x1720 [19419.844207] [<ffffffff8120c979>] ? handle_mm_fault+0x59/0x1720 [19419.850814] [<ffffffff810f51f4>] ? __lock_is_held+0x54/0x70 [19419.857130] [<ffffffff8107480a>] ? __do_page_fault+0x1ca/0x470 [19419.863737] [<ffffffff81074ae0>] ? do_page_fault+0x30/0x80 [19419.869955] [<ffffffff8177ff87>] ? native_iret+0x7/0x7 [19419.875788] [<ffffffff81781838>] ? page_fault+0x28/0x30 [19419.881708] [<ffffffff813c77ef>] ? __get_user_8+0x1f/0x29 [19419.887831] [<ffffffff8113b072>] ? exit_robust_list+0x52/0x1a0 [19419.894437] [<ffffffff810f8cfd>] ? trace_hardirqs_on+0xd/0x10 [19419.900952] [<ffffffff81095913>] ? mm_release+0x143/0x160 [19419.907075] [<ffffffff8109bf36>] ? do_exit+0x166/0xce0 [19419.912899] [<ffffffff8109cb3c>] ? do_group_exit+0x4c/0xc0 [19419.919118] [<ffffffff810aaaf1>] ? get_signal+0x331/0x8f0 [19419.925243] [<ffffffff8101d3c7>] ? do_signal+0x37/0x680 [19419.931172] [<ffffffff810d592c>] ? local_clock+0x1c/0x30 [19419.937197] [<ffffffff81117653>] ? rcu_read_lock_sched_held+0x93/0xa0 [19419.944485] [<ffffffff8123f11d>] ? kfree+0x1bd/0x290 [19419.950124] [<ffffffff810926a4>] ? exit_to_usermode_loop+0x33/0xac [19419.957110] [<ffffffff810926cf>] ? exit_to_usermode_loop+0x5e/0xac [19419.964107] [<ffffffff81003d0b>] ? syscall_return_slowpath+0xbb/0x130 [19419.971383] [<ffffffff8177f55a>] ? int_ret_from_sys_call+0x25/0x9f [19430.309232] MemAlloc-Info: 12 stalling task, 0 dying task, 0 victim task. [19430.316821] MemAlloc: auditd(783) seq=615 gfp=0x24201ca order=0 delay=40786 [19430.324593] MemAlloc: irqbalance(806) seq=8107 gfp=0x24201ca order=0 delay=44125 [19430.332847] MemAlloc: chronyd(808) seq=3155 gfp=0x24200ca order=0 delay=10259 [19430.340812] MemAlloc: systemd-logind(818) seq=2191 gfp=0x24200ca order=0 delay=21762 [19430.349456] MemAlloc: NetworkManager(820) seq=10854 gfp=0x24200ca order=0 delay=45212 [19430.358190] MemAlloc: gssproxy(826) seq=586 gfp=0x24201ca order=0 delay=44172 [19430.366157] MemAlloc: tuned(1337) seq=40098 gfp=0x24201ca order=0 delay=45585 [19430.374121] MemAlloc: crond(2242) seq=5612 gfp=0x24201ca order=0 delay=41014 [19430.381989] MemAlloc: systemd-journal(22961) seq=151917 gfp=0x24201ca order=0 delay=46264 [19430.391118] MemAlloc: sendmail(31908) seq=7256 gfp=0x24200ca order=0 delay=43318 [19430.399365] MemAlloc: kworker/2:2(32161) seq=9 gfp=0x2400000 order=0 delay=45574 [19430.407619] MemAlloc: oom01(32704) seq=6391 gfp=0x24200ca order=0 delay=44849 exiting -- 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>