------- Comment From ru...@us.ibm.com 2017-02-16 19:26 EDT------- *** Bug 150778 has been marked as a duplicate of this bug. ***
------- Comment From ru...@us.ibm.com 2017-02-16 19:28 EDT------- >From the recently dup'ed bug: This looks to be just a new informational warning added to the 4.9 kernel: commit 63f53dea0c9866e93802d50a230c460a024c44e5 Author: Michal Hocko <mho...@suse.com> Date: Fri Oct 7 17:01:58 2016 -0700 mm: warn about allocations which stall for too long Currently we do warn only about allocation failures but small allocations are basically nofail and they might loop in the page allocator for a long time. Especially when the reclaim cannot make any progress - e.g. GFP_NOFS cannot invoke the oom killer and rely on a different context to make a forward progress in case there is a lot memory used by filesystems. Give us at least a clue when something like this happens and warn about allocations which take more than 10s. Print the basic allocation context information along with the cumulative time spent in the allocation as well as the allocation stack. Repeat the warning after every 10 seconds so that we know that the problem is permanent rather than ephemeral. I suspect this is nothing more than the high memory stress tests triggering a new warning. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1664708 Title: LTPstress :- genload: page allocation stalls on Ubuntu 17.04 , Power NV system Status in linux package in Ubuntu: New Bug description: == Comment: #0 - Shriya R. Kulkarni <shriy...@in.ibm.com> - 2017-02-10 06:24:36 == Problem Description : ============== Executed ./ltpstress.sh from ltp testsuite on Bare metal and suddenly system hangs up for few minutes. I see call traces in dmesg as genload : page allocation stalls. Test : --------- Execution of ltpstress (LTP version : ltp-full-20170116) System : -------------- Ubuntu 17.04, Power NV(Habanero and POwerKVM5) uname -a : --------------- 4.9.0-15-generic Steps : ---------- 1. Download ltp testsuite 2. Untar 3. ./configure, make , make install 4. cd /opt/ltp/testscripts/ 5. ./ltpstress.sh Call trace : ---------------- [ 5443.865352] genload: [ 5443.865352] genload: page allocation stalls for 37764ms, order:0, mode:0x24200ca(GFP_HIGHUSER_MOVABLE) [ 5443.865360] page allocation stalls for 51524ms, order:0 [ 5443.865362] , mode:0x24200ca(GFP_HIGHUSER_MOVABLE) [ 5443.865365] CPU: 68 PID: 33142 Comm: genload Not tainted 4.9.0-15-generic #16-Ubuntu [ 5443.865366] Call Trace: [ 5443.865372] [c000003bf10d3940] [c000000000b2b720] dump_stack+0xb0/0xf0 (unreliable) [ 5443.865377] [c000003bf10d3980] [c000000000259560] warn_alloc+0x130/0x160 [ 5443.865382] [c000003bf10d3a10] [c00000000025a1b0] __alloc_pages_nodemask+0xb80/0xff0 [ 5443.865386] [c000003bf10d3c30] [c0000000002d2794] alloc_pages_vma+0x104/0x350 [ 5443.865390] [c000003bf10d3cc0] [c00000000029e948] handle_mm_fault+0x1058/0x1510 [ 5443.865393] [c000003bf10d3d80] [c000000000054d10] do_page_fault+0x350/0x7d0 [ 5443.865398] [c000003bf10d3e30] [c00000000000b148] handle_page_fault+0x10/0x30 [ 5443.865400] Mem-Info: [ 5443.865403] CPU: 22 PID: 33414 Comm: genload Not tainted 4.9.0-15-generic #16-Ubuntu [ 5443.865404] Call Trace: [ 5443.865407] [c000003b565e7940] [c000000000b2b720] dump_stack+0xb0/0xf0 [ 5443.865414] active_anon:3975704 inactive_anon:84983 isolated_anon:12968 active_file:233 inactive_file:186 isolated_file:0 unevictable:69 dirty:4 writeback:5409 unstable:0 slab_reclaimable:5089 slab_unreclaimable:25129 mapped:107 shmem:3 pagetables:1631 bounce:0 free:2544 free_pcp:0 free_cma:214 [ 5443.865416] (unreliable) [ 5443.865420] [c000003b565e7980] [c000000000259560] warn_alloc+0x130/0x160 [ 5443.865424] [c000003b565e7a10] [c00000000025a1b0] __alloc_pages_nodemask+0xb80/0xff0 [ 5443.865428] [c000003b565e7c30] [c0000000002d2794] alloc_pages_vma+0x104/0x350 [ 5443.865438] [c000003b565e7cc0] [c00000000029e948] handle_mm_fault+0x1058/0x1510 [ 5443.865438] Node 0 active_anon:254445056kB inactive_anon:5438912kB active_file:14912kB inactive_file:11904kB unevictable:4416kB isolated(anon):829952kB isolated(file):0kB mapped:6848kB dirty:256kB writeback:346176kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 217022464kB anon_thp: 192kB writeback_tmp:0kB unstable:0kB pages_scanned:0 all_unreclaimable? no [ 5443.865443] [c000003b565e7d80] [c000000000054d10] do_page_fault+0x350/0x7d0 [ 5443.865443] Node 0 DMA free:162816kB min:180224kB low:443776kB high:707328kB active_anon:254445056kB inactive_anon:5436096kB active_file:10816kB inactive_file:15232kB unevictable:4416kB writepending:341504kB present:268435456kB managed:263658752kB mlocked:4416kB slab_reclaimable:325696kB slab_unreclaimable:1608256kB kernel_stack:21776kB pagetables:104384kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:13696kB [ 5443.865453] lowmem_reserve[]: [ 5443.865457] [c000003b565e7e30] [c00000000000b148] handle_page_fault+0x10/0x30 [ 5443.865458] 0 [ 5443.865460] 0 [ 5443.865461] 0 0 [ 5443.865464] Mem-Info: [ 5443.865466] Node 0 DMA: 433*64kB (UMEC) 135*128kB [ 5443.865476] active_anon:3975704 inactive_anon:84983 isolated_anon:12968 active_file:233 inactive_file:186 isolated_file:0 unevictable:69 dirty:4 writeback:5409 unstable:0 slab_reclaimable:5089 slab_unreclaimable:25129 mapped:107 shmem:3 pagetables:1631 bounce:0 free:2544 free_pcp:0 free_cma:214 [ 5443.865477] (UMEC) 35*256kB (UME) 10*512kB (UMEC) 32*1024kB (UME) 9*2048kB (UME) 3*4096kB (UM) 6*8192kB (MC) 0*16384kB = 171712kB [ 5443.865493] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1024kB == Comment: #4 - Shriya R. Kulkarni <shriy...@in.ibm.com> - 2017-02-14 00:43:01 == Hi Canonical, This bug appears to be similar to https://lkml.org/lkml/2017/1/11/189 and does not appear to be Power arch specific. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1664708/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
