So, have tried every possible solution related to the problem found on internet but nothing seems to work for me till now.
My ubuntu syslog before the crash:
Jul 9 19:51:07 rohanagarwal94 kernel: [ 1823.748990] Purging GPU memory, 69632 bytes freed, 4956160 bytes still pinned.
Jul 9 19:51:14 rohanagarwal94 kernel: [ 1823.749910] java invoked oom-killer: gfp_mask=0x280da, order=0, oom_score_adj=0
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749913] java cpuset=session-c2.scope mems_allowed=0
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749919] CPU: 1 PID: 3566 Comm: java Tainted: P OE 3.19.0-64-generic #72-Ubuntu
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749921] Hardware name: Hewlett-Packard HP 15 Notebook PC/2212, BIOS F.37 01/21/2015
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749923] 0000000000000000 ffff880157c53a18 ffffffff817cc28b ffff88006ebc13a0
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749926] 0000000000000000 ffff880157c53a98 ffffffff817c9f5a 0000000000000000
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749928] 0000000000000000 0000000000000000 0000000000000000 ffff8801546844b0
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749931] Call Trace:
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749940] [<ffffffff817cc28b>] dump_stack+0x63/0x81
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749943] [<ffffffff817c9f5a>] dump_header+0x7f/0x1e7
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749949] [<ffffffff8118069b>] oom_kill_process+0x22b/0x390
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749954] [<ffffffff81080f5e>] ? has_capability_noaudit+0x1e/0x30
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749957] [<ffffffff81180c0d>] out_of_memory+0x24d/0x500
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749961] [<ffffffff81186bcc>] __alloc_pages_nodemask+0xb2c/0xbc0
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749965] [<ffffffff811cfa15>] alloc_pages_vma+0x95/0x1b0
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749970] [<ffffffff811aef0a>] handle_mm_fault+0xdea/0x1030
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749974] [<ffffffff810ae0f5>] ? update_curr+0x75/0x1a0
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749978] [<ffffffff81064c2d>] __do_page_fault+0x1dd/0x5b0
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749982] [<ffffffff810aad5d>] ? set_next_entity+0x9d/0xb0
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749985] [<ffffffff810b371f>] ? pick_next_task_fair+0x6af/0x8b0
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749988] [<ffffffff810b371f>] ? pick_next_task_fair+0x6af/0x8b0
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749993] [<ffffffff81014665>] ? __switch_to+0x1d5/0x610
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.749996] [<ffffffff810a794d>] ? sched_clock_cpu+0x9d/0xb0
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.750000] [<ffffffff817ce524>] ? __schedule+0x394/0x940
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.750003] [<ffffffff81065031>] do_page_fault+0x31/0x70
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.750006] [<ffffffff817d5668>] page_fault+0x28/0x30
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.750008] Mem-Info:
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.750010] Node 0 DMA per-cpu:
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.750012] CPU 0: hi: 0, btch: 1 usd: 0
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.750013] CPU 1: hi: 0, btch: 1 usd: 0
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.750015] CPU 2: hi: 0, btch: 1 usd: 0
Jul 9 19:51:17 rohanagarwal94 kernel: [ 1823.750016] CPU 3: hi: 0, btch: 1 usd: 0
Jul 9 19:54:03 rohanagarwal94 rsyslogd: [origin software="rsyslogd" swVersion="7.4.4" x-pid="689" x-info="http://www.rsyslog.com"] start
I was pretty much a Windows user my whole life. So I certainly know very little about ubuntu and its commands. Would appreciate if someone could provide a solution to the problem.