[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.354602] 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: [ 27.304125] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 27.692538] random: sshd: uninitialized urandom read (32 bytes read, 43 bits of entropy available) [ 28.236353] random: sshd: uninitialized urandom read (32 bytes read, 56 bits of entropy available) [ 28.402797] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. [ 34.072969] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) executing program [ 34.159371] BUG: unable to handle kernel paging request at ffffeafff8d38008 [ 34.166777] IP: [] page_remove_rmap+0x2e/0x260 [ 34.173031] PGD 0 [ 34.175292] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.180236] Dumping ftrace buffer: [ 34.183748] (ftrace buffer empty) [ 34.187433] Modules linked in: [ 34.190722] CPU: 0 PID: 3849 Comm: syz-executor131 Not tainted 4.4.150-g5541782 #19 [ 34.198489] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.207869] task: ffff8801d95d6000 task.stack: ffff8800b6fa8000 [ 34.213903] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.222585] RSP: 0018:ffff8800b6faf948 EFLAGS: 00010246 [ 34.228010] RAX: dffffc0000000000 RBX: ffffeafff8d38000 RCX: 0000000000000000 [ 34.235256] RDX: 1ffffd5fff1a7001 RSI: ffffffff814bceaf RDI: ffffeafff8d38008 [ 34.242505] RBP: ffff8800b6faf958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 34.249750] R10: 0000000000000001 R11: ffff8801d95d6000 R12: 0000000000000001 [ 34.256996] R13: 1ffff10016df5f2f R14: ffff8801cc6b6800 R15: ffffeafff8d38000 [ 34.264244] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.272443] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 34.278297] CR2: ffffeafff8d38008 CR3: 00000001d96cb000 CR4: 00000000001606f0 [ 34.285649] Stack: [ 34.287778] ffff8800b6fafbd8 0000000000000001 ffff8800b6fafa00 ffffffff8150ad13 [ 34.295782] 00003ffe34e001e0 00003ffe34e001e0 0000000041b58ab3 ffffffff841ef837 [ 34.303818] ffffffff8150ab10 00000000000004f0 ffff8800b10f7cb8 ffff8800b6faf9c8 [ 34.311801] Call Trace: [ 34.314364] [] zap_huge_pmd+0x203/0x510 [ 34.319969] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.326526] [] unmap_single_vma+0xea3/0x1240 [ 34.332562] [] ? vm_normal_page+0x280/0x280 [ 34.338508] [] ? __put_single_page+0x60/0x60 [ 34.344633] [] unmap_vmas+0x81/0xd0 [ 34.349895] [] exit_mmap+0x1c9/0x3a0 [ 34.355234] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.361705] [] ? up_write+0x1a/0x60 [ 34.366962] [] mmput+0xf8/0x2d0 [ 34.371871] [] do_exit+0x8d8/0x26b0 [ 34.377127] [] ? file_map_prot_check+0x193/0x310 [ 34.383515] [] ? release_task.part.17+0x1200/0x1200 [ 34.390165] [] ? SyS_mprotect+0x41e/0x640 [ 34.395939] [] ? up_write+0x1a/0x60 [ 34.401193] [] ? SyS_mprotect+0x423/0x640 [ 34.406967] [] do_group_exit+0x111/0x330 [ 34.412659] [] ? do_group_exit+0x330/0x330 [ 34.418551] [] SyS_exit_group+0x1d/0x20 [ 34.424154] [] do_fast_syscall_32+0x324/0x8b0 [ 34.430301] [] sysenter_flags_fixed+0xd/0x1a [ 34.436548] 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 [ 34.463446] RIP [] page_remove_rmap+0x2e/0x260 [ 34.469838] RSP [ 34.473441] CR2: ffffeafff8d38008 [ 34.476869] ---[ end trace 2a7dba31967ccf9f ]--- [ 34.481599] Kernel panic - not syncing: Fatal exception [ 34.487241] Dumping ftrace buffer: [ 34.490765] (ftrace buffer empty) [ 34.494451] Kernel Offset: disabled [ 34.498059] Rebooting in 86400 seconds..