It triggers a lot of ooms, but there is enough memory(many large blocks). And at last "Kernel panic - not syncing: Out of memory and no killable processes..." I find almost the every call trace include "pagefault_out_of_memory" and "gfp_mask=0x0". If it does oom, why not it triger in mm core path? e.g. __alloc_pages_nodemask -> __alloc_pages_slowpath -> __alloc_pages_may_oom ... And if the allocation from user space, why the gfp_mask=0x0? (usually is GFP_HIGHUSER_MOVABLE, instead of GFP_NOWAIT) Here is one oom log, the kernel is v3.10 stable. <4>[63651.040008s][pid:2912,cpu3,sh]sh invoked oom-killer: gfp_mask=0x0, order=0, oom_score_adj=-1000 <6>[63651.040039s][pid:2912,cpu3,sh]sh cpuset=/ mems_allowed=0 <4>[63651.040039s][pid:2912,cpu3,sh]CPU: 3 PID: 2912 Comm: sh Tainted: G B 3.10.90-g97d130c #1 <0>[63651.040039s][pid:2912,cpu3,sh]Call trace: <4>[63651.040069s][pid:2912,cpu3,sh][<ffffffc000088e5c>] dump_backtrace+0x0/0x124 <4>[63651.040069s][pid:2912,cpu3,sh][<ffffffc000088f9c>] show_stack+0x10/0x1c <4>[63651.040100s][pid:2912,cpu3,sh][<ffffffc000c465d0>] dump_stack+0x1c/0x28 <4>[63651.040100s][pid:2912,cpu3,sh][<ffffffc00014e698>] dump_header.isra.13+0x88/0x1a8 <4>[63651.040100s][pid:2912,cpu3,sh][<ffffffc00014ec18>] oom_kill_process+0x280/0x3f4 <4>[63651.040130s][pid:2912,cpu3,sh][<ffffffc00014f25c>] out_of_memory+0x2c0/0x2fc <4>[63651.040130s][pid:2912,cpu3,sh][<ffffffc00014f2d0>] pagefault_out_of_memory+0x38/0x54 <4>[63651.040130s][pid:2912,cpu3,sh][<ffffffc000c5376c>] do_page_fault.part.6+0x310/0x33c <4>[63651.040130s][pid:2912,cpu3,sh][<ffffffc000c537c4>] do_page_fault+0x2c/0xd0 <4>[63651.040161s][pid:2912,cpu3,sh][<ffffffc000081240>] do_mem_abort+0x38/0x9c <4>[63651.040161s][pid:2912,cpu3,sh]Exception stack(0xffffffc0457e7e30 to 0xffffffc0457e7f50) <4>[63651.040161s][pid:2912,cpu3,sh]7e20: 4e3f5d07 00000000 97c4a3e8 0000007f <4>[63651.040191s][pid:2912,cpu3,sh]7e40: ffffffff ffffffff 97c16e7c 0000007f 00000000 00000000 97c39f10 0000007f <4>[63651.040191s][pid:2912,cpu3,sh]7e60: ebe1a7f0 0000007f 000843ac ffffffc0 457e7e90 ffffffc0 00084ff0 ffffffc0 <4>[63651.040191s][pid:2912,cpu3,sh]7e80: 457e7e90 ffffffc0 00084ffc ffffffc0 457e7eb0 ffffffc0 000889c0 ffffffc0 <4>[63651.040222s][pid:2912,cpu3,sh]7ea0: 00000008 00000000 000000a7 00000000 ebe1a7c0 0000007f 0008444c ffffffc0 <4>[63651.040222s][pid:2912,cpu3,sh]7ec0: 4e3f5d07 00000000 000843ac ffffffc0 97c4a3e8 0000007f 979e2620 0000007f <4>[63651.040222s][pid:2912,cpu3,sh]7ee0: 00000618 00000000 00000000 00000000 00002e40 00000000 00050d63 00000000 <4>[63651.040252s][pid:2912,cpu3,sh]7f00: 00000000 00000000 f23aeec6 0000002a 979edcbc 0000007f 979ed40c 0000007f <4>[63651.040252s][pid:2912,cpu3,sh]7f20: 979e3848 0000007f 00000041 00000000 00000001 00000000 00000000 00000000 <4>[63651.040252s][pid:2912,cpu3,sh]7f40: 00000002 00000000 00000002 00000000 <4>[63651.040252s][pid:2912,cpu3,sh]Mem-Info: <4>[63651.040283s][pid:2912,cpu3,sh]DMA per-cpu: <4>[63651.040283s][pid:2912,cpu3,sh]CPU 0: hi: 186, btch: 31 usd: 156 <4>[63651.040283s][pid:2912,cpu3,sh]CPU 1: hi: 186, btch: 31 usd: 105 <4>[63651.040283s][pid:2912,cpu3,sh]CPU 2: hi: 186, btch: 31 usd: 147 <4>[63651.040313s][pid:2912,cpu3,sh]CPU 3: hi: 186, btch: 31 usd: 159 <4>[63651.040313s][pid:2912,cpu3,sh]CPU 4: hi: 186, btch: 31 usd: 182 <4>[63651.040313s][pid:2912,cpu3,sh]CPU 5: hi: 186, btch: 31 usd: 181 <4>[63651.040313s][pid:2912,cpu3,sh]CPU 6: hi: 186, btch: 31 usd: 59 <4>[63651.040313s][pid:2912,cpu3,sh]CPU 7: hi: 186, btch: 31 usd: 167 <4>[63651.040344s][pid:2912,cpu3,sh]active_anon:85765 inactive_anon:306 isolated_anon:0 <4>[63651.040344s] active_file:26899 inactive_file:116289 isolated_file:0 <4>[63651.040344s] unevictable:260 dirty:10 writeback:0 unstable:0 <4>[63651.040344s] free:137650 slab_reclaimable:6762 slab_unreclaimable:18325 <4>[63651.040344s] mapped:50105 shmem:328 pagetables:3621 bounce:0 <4>[63651.040344s] free_cma:7724 <4>[63651.040374s][pid:2912,cpu3,sh]DMA free:550600kB min:5244kB low:27580kB high:28892kB active_anon:343060kB inactive_anon:1224kB active_file:107596kB inactive_file:465156kB unevictable:1040kB isolated(anon):0kB isolated(file):0kB present:2016252kB managed:1720040kB mlocked:1040kB dirty:40kB writeback:0kB mapped:200420kB shmem:1312kB slab_reclaimable:27048kB slab_unreclaimable:73300kB kernel_stack:15248kB pagetables:14484kB unstable:0kB bounce:0kB free_cma:30896kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no <4>[63651.040374s][pid:2912,cpu3,sh]lowmem_reserve[]: 0 0 0 <4>[63651.040374s][pid:2912,cpu3,sh]DMA: 2883*4kB (UEMC) 1235*8kB (UEMC) 583*16kB (UEM) 309*32kB (UEMC) 117*64kB (UEM) 58*128kB (UEMC) 12*256kB (UEM) 6*512kB (UEM) 6*1024kB (U) 6*2048kB (UMC) 115*4096kB (UMRC) = 551156kB <4>[63651.040435s][pid:2912,cpu3,sh]152759 total pagecache pages <4>[63651.040435s][pid:2912,cpu3,sh]0 pages in swap cache <4>[63651.040435s][pid:2912,cpu3,sh]Swap cache stats: add 0, delete 0, find 0/10 <4>[63651.040435s][pid:2912,cpu3,sh]Free swap = 524280kB <4>[63651.040466s][pid:2912,cpu3,sh]Total swap = 524280kB <4>[63651.067657s][pid:2912,cpu3,sh]504063 pages RAM <4>[63651.067687s][pid:2912,cpu3,sh]23820 pages reserved <4>[63651.067687s][pid:2912,cpu3,sh]1420923 pages shared <4>[63651.067687s][pid:2912,cpu3,sh]261855 pages non-shared <6>[63651.067718s][pid:2912,cpu3,sh][ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name <6>[63651.067779s][pid:2912,cpu3,sh][ 250] 0 250 1084 249 4 0 -1000 ueventd <6>[63651.067779s][pid:2912,cpu3,sh][ 252] 0 252 678 87 4 0 -1000 oeminfo_nvm_ser <6>[63651.067779s][pid:2912,cpu3,sh][ 299] 1036 299 5090 1893 14 0 -1000 logd <6>[63651.067810s][pid:2912,cpu3,sh][ 300] 0 300 3758 771 11 0 -1000 vold <6>[63651.067810s][pid:2912,cpu3,sh][ 313] 0 313 1070 121 5 0 -1000 healthd <6>[63651.067810s][pid:2912,cpu3,sh][ 314] 0 314 1924 606 7 0 -1000 lmkd <6>[63651.067840s][pid:2912,cpu3,sh][ 315] 1000 315 1520 347 6 0 -1000 servicemanager <6>[63651.067840s][pid:2912,cpu3,sh][ 316] 1000 316 90116 4462 86 0 -1000 surfaceflinger <6>[63651.067871s][pid:2912,cpu3,sh][ 317] 1000 317 5109 537 14 0 -1000 perfhub <6>[63651.067871s][pid:2912,cpu3,sh][ 318] 0 318 3182 323 8 0 -1000 teecd <6>[63651.067871s][pid:2912,cpu3,sh][ 361] 0 361 6325 910 16 0 -1000 netd <6>[63651.067901s][pid:2912,cpu3,sh][ 362] 0 362 807 284 4 0 -1000 debuggerd <6>[63651.067901s][pid:2912,cpu3,sh][ 363] 0 363 1998 632 8 0 -1000 debuggerd64 <6>[63651.067901s][pid:2912,cpu3,sh][ 364] 1019 364 3968 1395 10 0 -1000 drmserver <6>[63651.067932s][pid:2912,cpu3,sh][ 366] 1013 366 7878 1740 16 0 -1000 mediaserver <6>[63651.067932s][pid:2912,cpu3,sh][ 367] 0 367 1528 349 6 0 -1000 installd <6>[63651.067932s][pid:2912,cpu3,sh][ 368] 1017 368 4402 852 11 0 -1000 keystore <6>[63651.067962s][pid:2912,cpu3,sh][ 369] 1000 369 1383 293 6 0 -1000 hw_ueventd <6>[63651.067962s][pid:2912,cpu3,sh][ 370] 0 370 309570 25514 163 0 -1000 main <6>[63651.067993s][pid:2912,cpu3,sh][ 371] 0 371 233222 20011 140 0 -1000 main <6>[63651.067993s][pid:2912,cpu3,sh][ 372] 0 372 2468 449 7 0 -1000 device_monitor <6>[63651.067993s][pid:2912,cpu3,sh][ 374] 0 374 1760 397 7 0 -1000 hwnffserver <6>[63651.068023s][pid:2912,cpu3,sh][ 375] 1000 375 1459 322 5 0 -1000 thermal-daemon <6>[63651.068023s][pid:2912,cpu3,sh][ 376] 1013 376 19568 2596 40 0 -1000 HwCamCfgSvr <6>[63651.068023s][pid:2912,cpu3,sh][ 377] 0 377 1585 125 5 0 -1000 adbd <6>[63651.068054s][pid:2912,cpu3,sh][ 378] 0 378 1584 126 5 0 -1000 hdbd <6>[63651.068054s][pid:2912,cpu3,sh][ 385] 0 385 1411 290 6 0 -1000 diagserver <6>[63651.068054s][pid:2912,cpu3,sh][ 386] 0 386 4119 829 11 0 -1000 atcmdserver <6>[63651.068084s][pid:2912,cpu3,sh][ 388] 1001 388 9090 1001 21 0 -1000 rild <6>[63651.068084s][pid:2912,cpu3,sh][ 389] 0 389 1361 287 5 0 -1000 pmom_cat <6>[63651.068084s][pid:2912,cpu3,sh][ 391] 0 391 3670 641 10 0 -1000 tlogcat <6>[63651.068115s][pid:2912,cpu3,sh][ 393] 0 393 1742 321 6 0 -1000 shs <6>[63651.068115s][pid:2912,cpu3,sh][ 394] 1000 394 4230 789 10 0 -1000 gatekeeperd <6>[63651.068115s][pid:2912,cpu3,sh][ 395] 0 395 1519 346 6 0 -1000 perfprofd <6>[63651.068145s][pid:2912,cpu3,sh][ 398] 1000 398 5079 838 12 0 -1000 fingerprintd <6>[63651.068145s][pid:2912,cpu3,sh][ 399] 0 399 3409 753 11 0 -1000 jankservice <6>[63651.068145s][pid:2912,cpu3,sh][ 400] 0 400 1431 334 5 0 -1000 chargelogcat <6>[63651.068176s][pid:2912,cpu3,sh][ 401] 0 401 4309 1666 12 0 -1000 hiscoutmanager <6>[63651.068176s][pid:2912,cpu3,sh][ 402] 0 402 1495 299 6 0 -1000 isplogcat <6>[63651.068176s][pid:2912,cpu3,sh][ 403] 0 403 2294 426 8 0 -1000 logserver <6>[63651.068206s][pid:2912,cpu3,sh][ 406] 0 406 1460 354 6 0 -1000 logcat <6>[63651.068206s][pid:2912,cpu3,sh][ 407] 0 407 1452 338 6 0 -1000 dumptool <6>[63651.068206s][pid:2912,cpu3,sh][ 409] 0 409 3177 755 9 0 -1000 chargemonitor <6>[63651.068237s][pid:2912,cpu3,sh][ 411] 0 411 2542 377 8 0 -1000 sleeplogcat <6>[63651.068237s][pid:2912,cpu3,sh][ 413] 0 413 1505 353 6 0 -1000 eventcat <6>[63651.068267s][pid:2912,cpu3,sh][ 414] 0 414 1689 380 6 0 -1000 hilogcat <6>[63651.068267s][pid:2912,cpu3,sh][ 416] 0 416 2409 185 7 0 -1000 factory_log_ser <6>[63651.068267s][pid:2912,cpu3,sh][ 593] 1013 593 41187 3247 45 0 -1000 mediaserver <6>[63651.068298s][pid:2912,cpu3,sh][ 701] 1000 701 1409 301 6 0 -1000 octty <6>[63651.068298s][pid:2912,cpu3,sh][ 702] 1000 702 2252 372 8 0 -1000 oam_hisi <6>[63651.068298s][pid:2912,cpu3,sh][ 703] 1000 703 2263 516 7 0 -1000 gnss_engine_his <6>[63651.068328s][pid:2912,cpu3,sh][ 704] 1000 704 3933 574 10 0 -1000 gnss_control_hi <6>[63651.068328s][pid:2912,cpu3,sh][ 706] 1000 706 5217 1223 14 0 -1000 gnss_supl20clie <6>[63651.068328s][pid:2912,cpu3,sh][ 707] 1000 707 1360 502 5 0 -1000 gnss_watchlssd_ <6>[63651.068359s][pid:2912,cpu3,sh][ 717] 1000 717 1424 319 5 0 -1000 lss <6>[63651.068359s][pid:2912,cpu3,sh][ 957] 1000 957 370859 40098 271 0 -941 system_server <6>[63651.068389s][pid:2912,cpu3,sh][ 1227] 1000 1227 311127 17585 128 0 -705 wei.securitymgr <6>[63651.068389s][pid:2912,cpu3,sh][ 1236] 10006 1236 438735 36718 219 0 -705 ndroid.systemui <6>[63651.068389s][pid:2912,cpu3,sh][ 1257] 10006 1257 401625 31013 208 0 -705 ndroid.keyguard <6>[63651.068420s][pid:2912,cpu3,sh][ 1345] 10002 1345 316182 22367 153 0 294 d.process.acore <6>[63651.068420s][pid:2912,cpu3,sh][ 1460] 10003 1460 311929 19710 148 0 647 d.process.media <6>[63651.068420s][pid:2912,cpu3,sh][ 1521] 1000 1521 316677 19249 145 0 529 ndroid.settings <6>[63651.068450s][pid:2912,cpu3,sh][ 1594] 10019 1594 314871 20932 148 0 117 putmethod.latin <6>[63651.068450s][pid:2912,cpu3,sh][ 1639] 1000 1639 313224 19145 135 0 -705 om.android.supl <6>[63651.068450s][pid:2912,cpu3,sh][ 1653] 1001 1653 321115 23914 160 0 -705 m.android.phone <6>[63651.068481s][pid:2912,cpu3,sh][ 1680] 10018 1680 485086 35356 229 0 0 droid.launcher3 <6>[63651.068481s][pid:2912,cpu3,sh][ 1693] 10016 1693 311750 17748 135 0 764 id.printspooler <6>[63651.068481s][pid:2912,cpu3,sh][ 1768] 1001 1768 312733 18723 133 0 58 ndroid.incallui <6>[63651.068511s][pid:2912,cpu3,sh][ 2172] 1050 2172 311737 18111 136 0 470 .service:remote <6>[63651.068511s][pid:2912,cpu3,sh][ 2725] 0 2725 1387 295 6 0 -1000 dmesgcat <6>[63651.068542s][pid:2912,cpu3,sh][ 2856] 1000 2856 311451 17196 130 0 -705 i.runningtestii <6>[63651.068542s][pid:2912,cpu3,sh][ 2912] 0 2912 813 72 5 0 -1000 sh <3>[63651.068542s][pid:2912,cpu3,sh]Out of memory: Kill process 1693 (id.printspooler) score 792 or sacrifice child <3>[63651.068572s][pid:2912,cpu3,sh]Killed process 1693 (id.printspooler) total-vm:1247000kB, anon-rss:48032kB, file-rss:22960kB -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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