With crashkernel=145, I get a bit more information : [ 1.351621] Mem-Info: [ 1.351897] active_anon:3939 inactive_anon:12 isolated_anon:0 [ 1.351897] active_file:1120 inactive_file:1335 isolated_file:0 [ 1.351897] unevictable:18546 dirty:0 writeback:0 unstable:0 [ 1.351897] slab_reclaimable:2235 slab_unreclaimable:1684 [ 1.351897] mapped:1440 shmem:16 pagetables:248 bounce:0 [ 1.351897] free:472 free_pcp:5 free_cma:0 [ 1.355454] Node 0 DMA free:480kB min:4kB low:4kB high:4kB active_anon:0kB inactive_anon:0kB active_file:0kB ina ctive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:632kB managed:548kB mlocked:0kB dirty: 0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:56kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimabl e? yes [ 1.359904] lowmem_reserve[]: 0 121 121 121 [ 1.360451] Node 0 DMA32 free:1408kB min:1408kB low:1760kB high:2112kB active_anon:15756kB inactive_anon:48kB ac tive_file:4480kB inactive_file:5340kB unevictable:74184kB isolated(anon):0kB isolated(file):0kB present:147828kB ma naged:126836kB mlocked:1716kB dirty:0kB writeback:0kB mapped:5760kB shmem:64kB slab_reclaimable:8940kB slab_unrecla imable:6680kB kernel_stack:1008kB pagetables:992kB unstable:0kB bounce:0kB free_pcp:20kB local_pcp:20kB free_cma:0k B writeback_tmp:0kB pages_scanned:72640 all_unreclaimable? yes [ 1.365436] lowmem_reserve[]: 0 0 0 0 [ 1.365914] Node 0 DMA: 0*4kB 1*8kB (U) 1*16kB (U) 0*32kB 1*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 0*1024kB 0* 2048kB 0*4096kB = 472kB [ 1.367484] Node 0 DMA32: 2*4kB (UM) 1*8kB (U) 1*16kB (M) 3*32kB (UEM) 0*64kB 2*128kB (EM) 2*256kB (UE) 1*512kB (U) 0*1024kB 0*2048kB 0*4096kB = 1408kB [ 1.369238] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB [ 1.370177] 20930 total pagecache pages [ 1.370604] 0 pages in swap cache [ 1.370984] Swap cache stats: add 0, delete 0, find 0/0 [ 1.371563] Free swap = 0kB [ 1.371887] Total swap = 0kB [ 1.372222] 37115 pages RAM [ 1.372542] 0 pages HighMem/MovableOnly [ 1.372970] 5269 pages reserved [ 1.373322] 0 pages cma reserved [ 1.373684] 0 pages hwpoisoned [ 1.374028] [ pid ] uid tgid total_vm rss nr_ptes nr_pmds swapents oom_score_adj name [ 1.374968] [ 97] 0 97 1169 217 8 3 0 0 udev [ 1.375899] [ 99] 0 99 6870 791 17 3 0 -1000 systemd-udevd [ 1.376932] [ 105] 0 105 6612 641 18 3 0 0 udevadm [ 1.377895] [ 106] 0 106 6738 774 16 3 0 0 systemd-udevd [ 1.378920] [ 107] 0 107 6804 818 16 3 0 0 systemd-udevd [ 1.379934] [ 108] 0 108 6804 848 17 3 0 0 systemd-udevd [ 1.380967] [ 109] 0 109 6804 821 16 3 0 0 systemd-udevd [ 1.381990] [ 110] 0 110 6804 843 16 3 0 0 systemd-udevd [ 1.383012] [ 111] 0 111 6804 834 16 3 0 0 systemd-udevd [ 1.384041] [ 112] 0 112 6804 844 16 3 0 0 systemd-udevd [ 1.385088] [ 113] 0 113 6804 781 16 3 0 0 systemd-udevd [ 1.386101] [ 114] 0 114 6837 868 16 3 0 0 systemd-udevd [ 1.387123] [ 115] 0 115 6837 860 16 3 0 0 systemd-udevd [ 1.388149] [ 119] 0 119 1091 188 7 3 0 0 watershed [ 1.389136] [ 120] 0 120 1169 187 8 3 0 0 sh [ 1.390052] [ 125] 0 125 9139 3657 23 3 0 0 lvm [ 1.390980] Out of memory: Kill process 125 (lvm) score 112 or sacrifice child [ 1.391774] Killed process 125 (lvm) total-vm:36556kB, anon-rss:10924kB, file-rss:3704kB Begin: Loading essential drivers ... done. Begin: Running /scripts/init-premount ... done. Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done. Begin: Running /scripts/local-premount ... [ 1.732082] tsc: Refined TSC clocksource calibration: 3300.116 MHz [ 1.732786] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x2f91ba40ab4, max_idle_ns: 440795353086 ns done. Gave up waiting for root device. Common problems: - Boot args (cat /proc/cmdline) - Check rootdelay= (did the system wait long enough?) - Check root= (did the system wait for the right device?) - Missing modules (cat /proc/modules; ls /dev) ALERT! /dev/mapper/VividS--vg-root does not exist. Dropping to a shell! [ 36.491059] hidraw: raw HID events driver (C) Jiri Kosina BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1) built-in shell (ash) Enter 'help' for a list of built-in commands. (initramfs) The tipping point seems to be at 146M which works. 145M doesn't