[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.347839] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.434624] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.987915] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 28.724777] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) [ 34.977396] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) Warning: Permanently added '10.128.10.43' (ECDSA) to the list of known hosts. [ 40.486348] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) executing program [ 40.575465] BUG: unable to handle kernel paging request at ffffeafff8b88008 [ 40.582808] IP: [] page_remove_rmap+0x2e/0x260 [ 40.589055] PGD 0 [ 40.591300] Oops: 0000 [#1] PREEMPT SMP KASAN [ 40.596301] Dumping ftrace buffer: [ 40.599817] (ftrace buffer empty) [ 40.603506] Modules linked in: [ 40.606800] CPU: 0 PID: 3738 Comm: syz-executor964 Not tainted 4.4.150-g5541782 #19 [ 40.614567] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.623897] task: ffff8801ce163000 task.stack: ffff8801ccd38000 [ 40.629927] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 40.638606] RSP: 0018:ffff8801ccd3f948 EFLAGS: 00010246 [ 40.644026] RAX: dffffc0000000000 RBX: ffffeafff8b88000 RCX: 0000000000000000 [ 40.651270] RDX: 1ffffd5fff171001 RSI: ffffffff814bceaf RDI: ffffeafff8b88008 [ 40.658514] RBP: ffff8801ccd3f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 40.665760] R10: 0000000000000001 R11: ffff8801ce163000 R12: 0000000000000001 [ 40.673078] R13: 1ffff100399a7f2f R14: ffff8801d1b13800 R15: ffffeafff8b88000 [ 40.680332] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 40.688531] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 40.694388] CR2: ffffeafff8b88008 CR3: 00000001d1b0b000 CR4: 00000000001606f0 [ 40.701810] Stack: [ 40.703939] ffff8801ccd3fbd8 0000000000000001 ffff8801ccd3fa00 ffffffff8150ad13 [ 40.711992] 00003ffe2e2001e0 00003ffe2e2001e0 0000000041b58ab3 ffffffff841ef837 [ 40.720044] ffffffff8150ab10 00000000000004f0 ffff8801ce94a6e0 ffff8801ccd3f9c8 [ 40.728026] Call Trace: [ 40.730592] [] zap_huge_pmd+0x203/0x510 [ 40.736204] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 40.742760] [] unmap_single_vma+0xea3/0x1240 [ 40.748795] [] ? vm_normal_page+0x280/0x280 [ 40.754744] [] ? __put_single_page+0x60/0x60 [ 40.760774] [] unmap_vmas+0x81/0xd0 [ 40.766038] [] exit_mmap+0x1c9/0x3a0 [ 40.771384] [] ? SyS_remap_file_pages+0x870/0x870 [ 40.777864] [] ? up_write+0x1a/0x60 [ 40.783119] [] mmput+0xf8/0x2d0 [ 40.788029] [] do_exit+0x8d8/0x26b0 [ 40.793284] [] ? file_map_prot_check+0x193/0x310 [ 40.799664] [] ? release_task.part.17+0x1200/0x1200 [ 40.806309] [] ? SyS_mprotect+0x41e/0x640 [ 40.812081] [] ? up_write+0x1a/0x60 [ 40.817380] [] ? SyS_mprotect+0x423/0x640 [ 40.823161] [] do_group_exit+0x111/0x330 [ 40.828855] [] ? do_group_exit+0x330/0x330 [ 40.834791] [] SyS_exit_group+0x1d/0x20 [ 40.840402] [] do_fast_syscall_32+0x324/0x8b0 [ 40.846526] [] sysenter_flags_fixed+0xd/0x1a [ 40.852553] Code: e5 41 54 53 48 89 fb e8 31 76 e9 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 de 01 00 00 43 08 01 0f 84 4e 01 00 00 e8 03 76 e9 ff f0 83 43 18 ff 78 [ 40.879549] RIP [] page_remove_rmap+0x2e/0x260 [ 40.885896] RSP [ 40.889491] CR2: ffffeafff8b88008 [ 40.892919] ---[ end trace 1ebf4a48b8106257 ]--- [ 40.897647] Kernel panic - not syncing: Fatal exception [ 40.903309] Dumping ftrace buffer: [ 40.906828] (ftrace buffer empty) [ 40.910519] Kernel Offset: disabled [ 40.914116] Rebooting in 86400 seconds..