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Date: Mon, 24 Nov 2014 21:10:52 +0100 From: Toralf Förster <toralf.foerster@....de> To: linux-ext4@...r.kernel.org Subject: fuzz testing a KVM machine (x86) with ext4fs forces much more often the oom killer than btrfs If I change my fuzzer command sequence from "btrfs" to "ext4", eg.: $> mkdir /mnt/ramdisk/ext4; truncate -s 97M /mnt/ramdisk/ext4.fs; /sbin/mkfs.ext4 /mnt/ramdisk/ext4.fs; sudo su -c "mount /mnt/ramdisk/ext4.fs /mnt/ramdisk/ext4; chmod 777 /mnt/ramdisk/ext4" and then run trinity : $> D=/mnt/ramdisk/ext4; while [[ : ]]; do cd ~; sudo rm -rf $D/t3 && mkdir $D/t3 || break; cd $D/t3; mkdir -p v1/v2; for i in $(seq 0 99); do touch v1/v2/f$i; mkdir v1/v2/d$i; done; trinity -C 2 -N 100000 -V $D/t3/v1/v2 -q; echo; echo " done"; echo; sleep 4; done it tooks just few minutes till the KVM machine (32 bit stable Gentoo Linux, 2040 MB RAM assigned, 512 MB tmpfs) gives this : Nov 24 21:02:09 n22kvmclone kernel: init invoked oom-killer: gfp_mask=0x201da, order=0, oom_score_adj=0 Nov 24 21:02:09 n22kvmclone kernel: init cpuset=/ mems_allowed=0 Nov 24 21:02:09 n22kvmclone kernel: CPU: 0 PID: 1 Comm: init Not tainted 3.18.0-rc6 #7 Nov 24 21:02:09 n22kvmclone kernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014 Nov 24 21:02:09 n22kvmclone kernel: 00000000 00000000 f6081c54 cc05189a f6058000 f6081cb0 cc04f94c cc1a8e98 Nov 24 21:02:09 n22kvmclone kernel: f60583c0 000201da 00000000 00000000 00000286 cc25b2e0 cbc8499b f6081c8c Nov 24 21:02:09 n22kvmclone kernel: 00000286 cc25b2e0 00000001 f6081cb0 cbe55eea 00000286 00000000 00000000 Nov 24 21:02:09 n22kvmclone kernel: Call Trace: Nov 24 21:02:09 n22kvmclone kernel: [<cc05189a>] dump_stack+0x41/0x52 Nov 24 21:02:09 n22kvmclone kernel: [<cc04f94c>] dump_header.isra.12+0x6f/0x1df Nov 24 21:02:09 n22kvmclone kernel: [<cbc8499b>] ? trace_hardirqs_on+0xb/0x10 Nov 24 21:02:09 n22kvmclone kernel: [<cbe55eea>] ? ___ratelimit+0xaa/0x150 Nov 24 21:02:09 n22kvmclone kernel: [<cbd11a85>] oom_kill_process+0x195/0x300 Nov 24 21:02:09 n22kvmclone kernel: [<cbc51bf0>] ? has_capability+0x20/0x20 Nov 24 21:02:09 n22kvmclone kernel: [<cbc51c84>] ? has_capability_noaudit+0x14/0x20 Nov 24 21:02:09 n22kvmclone kernel: [<cbd11ff4>] ? out_of_memory+0x264/0x2f0 Nov 24 21:02:09 n22kvmclone kernel: [<cbd12056>] out_of_memory+0x2c6/0x2f0 Nov 24 21:02:09 n22kvmclone kernel: [<cbd15bc7>] __alloc_pages_nodemask+0x897/0x930 Nov 24 21:02:09 n22kvmclone kernel: [<cbd10909>] filemap_fault+0x379/0x600 Nov 24 21:02:09 n22kvmclone kernel: [<cbd31d5e>] ? __do_fault+0x2e/0x60 Nov 24 21:02:09 n22kvmclone kernel: [<cbd31d5e>] __do_fault+0x2e/0x60 Nov 24 21:02:09 n22kvmclone kernel: [<cc059072>] ? _raw_spin_unlock+0x22/0x30 Nov 24 21:02:09 n22kvmclone kernel: [<cbd348cc>] do_read_fault.isra.92+0x1dc/0x2d0 Nov 24 21:02:09 n22kvmclone kernel: [<cbd3522e>] handle_mm_fault+0x4ee/0x9f0 Nov 24 21:02:09 n22kvmclone kernel: [<cbc40408>] ? __do_page_fault+0x138/0x540 Nov 24 21:02:09 n22kvmclone kernel: [<cbc4045a>] __do_page_fault+0x18a/0x540 Nov 24 21:02:09 n22kvmclone kernel: [<cbd66347>] ? poll_select_copy_remaining+0xc7/0x110 Nov 24 21:02:09 n22kvmclone kernel: [<cbc40889>] trace_do_page_fault+0x49/0xd0 Nov 24 21:02:09 n22kvmclone kernel: [<cbc3de90>] ? kvm_async_pf_task_wait+0x1e0/0x1e0 Nov 24 21:02:09 n22kvmclone kernel: [<cbc3dea8>] do_async_page_fault+0x18/0x90 Nov 24 21:02:09 n22kvmclone kernel: [<cc05ac20>] error_code+0x6c/0x74 Nov 24 21:02:09 n22kvmclone kernel: Mem-Info: Nov 24 21:02:09 n22kvmclone kernel: DMA per-cpu: Nov 24 21:02:09 n22kvmclone kernel: CPU 0: hi: 0, btch: 1 usd: 0 Nov 24 21:02:09 n22kvmclone kernel: CPU 1: hi: 0, btch: 1 usd: 0 Nov 24 21:02:09 n22kvmclone kernel: Normal per-cpu: Nov 24 21:02:09 n22kvmclone kernel: CPU 0: hi: 186, btch: 31 usd: 0 Nov 24 21:02:09 n22kvmclone kernel: CPU 1: hi: 186, btch: 31 usd: 0 Nov 24 21:02:09 n22kvmclone kernel: HighMem per-cpu: Nov 24 21:02:09 n22kvmclone kernel: CPU 0: hi: 186, btch: 31 usd: 0 Nov 24 21:02:09 n22kvmclone kernel: CPU 1: hi: 186, btch: 31 usd: 0 Nov 24 21:02:09 n22kvmclone kernel: active_anon:53227 inactive_anon:433398 isolated_anon:0\x0a active_file:21 inactive_file:18 isolated_file:0\x0a unevictable:0 dirty:0 writeback:40020 unstable:0\x0a free:12207 slab_reclaimable:2831 slab_unreclaimable:10468\x0a mapped:12327 shmem:439161 pagetables:151 bounce:0\x0a free_cma:0 Nov 24 21:02:09 n22kvmclone kernel: DMA free:7724kB min:64kB low:80kB high:96kB active_anon:1896kB inactive_anon:5288kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15992kB managed:15916kB mlocked:0kB dirty:0kB writeback:8kB mapped:412kB shmem:7072kB slab_reclaimable:52kB slab_unreclaimable:884kB kernel_stack:16kB pagetables:16kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes Nov 24 21:02:09 n22kvmclone kernel: lowmem_reserve[]: 0 839 1993 1993 Nov 24 21:02:09 n22kvmclone kernel: Normal free:40596kB min:3672kB low:4588kB high:5508kB active_anon:86676kB inactive_anon:673760kB active_file:84kB inactive_file:72kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:892920kB managed:860264kB mlocked:0kB dirty:0kB writeback:0kB mapped:20292kB shmem:747452kB slab_reclaimable:11272kB slab_unreclaimable:40988kB kernel_stack:880kB pagetables:588kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:17056 all_unreclaimable? yes Nov 24 21:02:09 n22kvmclone kernel: lowmem_reserve[]: 0 0 9231 9231 B managed:1181576kB mlocked:0kB dirty:0kB writeback:160072kB mapped:28604kB shmem:1002120kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes Nov 24 21:02:09 n22kvmclone kernel: lowmem_reserve[]: 0 0 0 0 Nov 24 21:02:09 n22kvmclone kernel: DMA: 25*4kB (UM) 13*8kB (UM) 8*16kB (UM) 5*32kB (M) 1*64kB (M) 4*128kB (U) 6*256kB (U) 2*512kB (U) 0*1024kB 0*2048kB 1*4096kB (R) = 7724kB Nov 24 21:02:09 n22kvmclone kernel: Normal: 149*4kB (UEM) 287*8kB (UE) 143*16kB (UEM) 106*32kB (UEM) 66*64kB (UEM) 36*128kB (EM) 17*256kB (EM) 9*512kB (UM) 8*1024kB (UM) 1*2048kB (M) 1*4096kB (R) = 40700kB Nov 24 21:02:09 n22kvmclone kernel: HighMem: 24*4kB (MR) 2*8kB (R) 1*16kB (R) 1*32kB (R) 0*64kB 1*128kB (R) 1*256kB (R) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 544kB Nov 24 21:02:09 n22kvmclone kernel: 483957 total pagecache pages Nov 24 21:02:09 n22kvmclone kernel: 44761 pages in swap cache Nov 24 21:02:09 n22kvmclone kernel: Swap cache stats: add 125094, delete 80333, find 19/43 Nov 24 21:02:09 n22kvmclone kernel: Free swap = 0kB Nov 24 21:02:09 n22kvmclone kernel: Total swap = 499964kB Nov 24 21:02:09 n22kvmclone kernel: 522622 pages RAM Nov 24 21:02:09 n22kvmclone kernel: 295394 pages HighMem/MovableOnly Nov 24 21:02:09 n22kvmclone kernel: 0 pages reserved Nov 24 21:02:09 n22kvmclone kernel: [ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name Nov 24 21:02:09 n22kvmclone kernel: [ 934] 0 934 2501 107 4 0 -1000 systemd-udevd Nov 24 21:02:09 n22kvmclone kernel: [ 1491] 0 1491 2721 35 3 0 -1000 auditd Nov 24 21:02:09 n22kvmclone kernel: [ 1526] 0 1526 1185 47 5 0 0 syslog-ng Nov 24 21:02:09 n22kvmclone kernel: [ 1527] 0 1527 6569 239 7 0 0 syslog-ng Nov 24 21:02:09 n22kvmclone kernel: [ 1799] 0 1799 604 36 4 0 0 dhcpcd Nov 24 21:02:09 n22kvmclone kernel: [ 1865] 0 1865 1368 138 5 0 0 crond Nov 24 21:02:09 n22kvmclone kernel: [ 1887] 0 1887 1316 777 4 0 0 haveged Nov 24 21:02:09 n22kvmclone kernel: [ 2020] 0 2020 691 52 4 0 0 rpcbind Nov 24 21:02:09 n22kvmclone kernel: [ 2043] 0 2043 777 152 4 0 0 rpc.statd Nov 24 21:02:09 n22kvmclone kernel: [ 2091] 0 2091 1291 75 5 0 0 ntpd Nov 24 21:02:09 n22kvmclone kernel: [ 2119] 0 2119 1304 83 4 0 -1000 sshd Nov 24 21:02:09 n22kvmclone kernel: [ 2143] 0 2143 1149 37 5 0 0 agetty Nov 24 21:02:09 n22kvmclone kernel: [ 2144] 0 2144 1149 36 5 0 0 agetty Nov 24 21:02:09 n22kvmclone kernel: [ 2145] 0 2145 1149 36 5 0 0 agetty Nov 24 21:02:09 n22kvmclone kernel: [ 2146] 0 2146 1149 36 5 0 0 agetty Nov 24 21:02:09 n22kvmclone kernel: [ 2147] 0 2147 1149 36 5 0 0 agetty Nov 24 21:02:09 n22kvmclone kernel: [ 2148] 0 2148 1149 36 5 0 0 agetty Nov 24 21:02:09 n22kvmclone kernel: [ 2191] 0 2191 2099 142 6 0 0 sshd Nov 24 21:02:09 n22kvmclone kernel: [ 2196] 0 2196 1476 85 5 0 0 bash Nov 24 21:02:09 n22kvmclone kernel: [ 3284] 0 3284 1299 75 5 0 0 su Nov 24 21:02:09 n22kvmclone kernel: [ 3286] 1000 3286 1476 82 5 0 0 bash Nov 24 21:02:09 n22kvmclone kernel: [ 3512] 1000 3512 13944 226 3 0 0 trinity Nov 24 21:02:09 n22kvmclone kernel: [ 3513] 1000 3513 13944 34 3 0 0 trinity-watchdo Nov 24 21:02:09 n22kvmclone kernel: [ 3514] 1000 3514 14010 149 3 0 0 trinity-main Nov 24 21:02:09 n22kvmclone kernel: [ 3699] 0 3699 1476 162 5 0 0 crond Nov 24 21:02:09 n22kvmclone kernel: [ 3703] 0 3703 1071 26 5 0 0 sadc Nov 24 21:02:09 n22kvmclone kernel: [ 3873] 1000 3873 14042 1706 12 0 500 trinity-c0 Nov 24 21:02:09 n22kvmclone kernel: [ 3975] 1000 3975 14011 12309 16 0 500 trinity-c1 Nov 24 21:02:09 n22kvmclone kernel: Out of memory: Kill process 3975 (trinity-c1) score 518 or sacrifice child Nov 24 21:02:09 n22kvmclone kernel: Killed process 3975 (trinity-c1) total-vm:56044kB, anon-rss:492kB, file-rss:48744kB Nov 24 21:02:09 n22kvmclone kernel: trinity-main invoked oom-killer: gfp_mask=0x201da, order=0, oom_score_adj=0 Nov 24 21:02:09 n22kvmclone kernel: trinity-main cpuset=/ mems_allowed=0 Nov 24 21:02:09 n22kvmclone kernel: CPU: 1 PID: 3514 Comm: trinity-main Not tainted 3.18.0-rc6 #7 ... With BTRFS it would took much longer - so I'm wondering why ext4 needs so much more memory. -- Toralf pgp key: 0076 E94E -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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