[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.669952] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.323424] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.794057] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.561042] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) [ 27.742025] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) Warning: Permanently added '10.128.0.12' (ECDSA) to the list of known hosts. [ 33.289445] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) executing program [ 33.382030] BUG: unable to handle kernel paging request at ffffeafff8d70008 [ 33.389376] IP: [] page_remove_rmap+0x2e/0x260 [ 33.395624] PGD 0 [ 33.397864] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.402831] Dumping ftrace buffer: [ 33.406344] (ftrace buffer empty) [ 33.410032] Modules linked in: [ 33.413351] CPU: 0 PID: 3851 Comm: syz-executor424 Not tainted 4.4.150-g5541782 #83 [ 33.421120] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.430449] task: ffff8801d9be4800 task.stack: ffff8801c6498000 [ 33.436478] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.445151] RSP: 0018:ffff8801c649f9c0 EFLAGS: 00010246 [ 33.450572] RAX: dffffc0000000000 RBX: ffffeafff8d70000 RCX: 0000000000000000 [ 33.457833] RDX: 1ffffd5fff1ae001 RSI: ffffffff814bceaf RDI: ffffeafff8d70008 [ 33.465077] RBP: ffff8801c649f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.472321] R10: 0000000000000001 R11: ffff8801d9be4800 R12: 0000000000000001 [ 33.479568] R13: 1ffff10038c93f3e R14: ffff8801cac58800 R15: ffffeafff8d70000 [ 33.486814] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.495013] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.500867] CR2: ffffeafff8d70008 CR3: 00000001ce141000 CR4: 00000000001606f0 [ 33.508112] Stack: [ 33.510236] ffff8801c649fc50 0000000000000001 ffff8801c649fa78 ffffffff8150ad13 [ 33.518219] 00003ffe35c001e0 00003ffe35c001e0 0000000041b58ab3 ffffffff841ef837 [ 33.526229] ffffffff8150ab10 00000000000004f0 ffff8801caee6580 ffff8801c649fa40 [ 33.534211] Call Trace: [ 33.536777] [] zap_huge_pmd+0x203/0x510 [ 33.542388] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.548955] [] unmap_single_vma+0xea3/0x1240 [ 33.554996] [] ? vm_normal_page+0x280/0x280 [ 33.560943] [] ? __put_single_page+0x60/0x60 [ 33.566979] [] unmap_vmas+0x81/0xd0 [ 33.572237] [] exit_mmap+0x1c9/0x3a0 [ 33.577580] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.584048] [] ? up_write+0x1a/0x60 [ 33.589305] [] mmput+0xf8/0x2d0 [ 33.594595] [] do_exit+0x8d8/0x26b0 [ 33.599850] [] ? file_map_prot_check+0x193/0x310 [ 33.606238] [] ? release_task.part.17+0x1200/0x1200 [ 33.612880] [] ? SyS_mprotect+0x41e/0x640 [ 33.618652] [] ? up_write+0x1a/0x60 [ 33.623902] [] ? SyS_mprotect+0x423/0x640 [ 33.629677] [] ? retint_user+0x18/0x3c [ 33.635187] [] do_group_exit+0x111/0x330 [ 33.640899] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 33.647455] [] SyS_exit_group+0x1d/0x20 [ 33.653060] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.659611] 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 [ 33.686394] RIP [] page_remove_rmap+0x2e/0x260 [ 33.692728] RSP [ 33.696325] CR2: ffffeafff8d70008 [ 33.699753] ---[ end trace cf10794a1fd5c63f ]--- [ 33.704480] Kernel panic - not syncing: Fatal exception [ 33.710110] Dumping ftrace buffer: [ 33.713634] (ftrace buffer empty) [ 33.717335] Kernel Offset: disabled [ 33.720940] Rebooting in 86400 seconds..