[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.828671] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.826650] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 29.394003] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 29.997602] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) [ 30.158637] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) Warning: Permanently added '10.128.10.29' (ECDSA) to the list of known hosts. [ 35.800349] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) executing program [ 35.904680] BUG: unable to handle kernel paging request at ffffeafff8ca8008 [ 35.912040] IP: [] page_remove_rmap+0x2e/0x260 [ 35.918341] PGD 0 [ 35.920588] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.925539] Dumping ftrace buffer: [ 35.929054] (ftrace buffer empty) [ 35.932737] Modules linked in: [ 35.936023] CPU: 0 PID: 3854 Comm: syz-executor958 Not tainted 4.4.150-g5541782 #19 [ 35.943787] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.953114] task: ffff8801d936b000 task.stack: ffff8801cd168000 [ 35.959142] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 35.967827] RSP: 0018:ffff8801cd16f948 EFLAGS: 00010246 [ 35.973250] RAX: dffffc0000000000 RBX: ffffeafff8ca8000 RCX: 0000000000000000 [ 35.980498] RDX: 1ffffd5fff195001 RSI: ffffffff814bceaf RDI: ffffeafff8ca8008 [ 35.987756] RBP: ffff8801cd16f958 R08: ffffffff85333170 R09: 0000000000000000 [ 35.994999] R10: 0000000000000001 R11: ffff8801d936b000 R12: 0000000000000001 [ 36.002390] R13: 1ffff10039a2df2f R14: ffff8801c89ff800 R15: ffffeafff8ca8000 [ 36.009640] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 36.017838] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 36.023691] CR2: ffffeafff8ca8008 CR3: 00000001c7b60000 CR4: 00000000001606f0 [ 36.030936] Stack: [ 36.033059] ffff8801cd16fbd8 0000000000000001 ffff8801cd16fa00 ffffffff8150ad13 [ 36.041069] 00003ffe32a001e0 00003ffe32a001e0 0000000041b58ab3 ffffffff841ef837 [ 36.049053] ffffffff8150ab10 00000000000004f0 ffff8801c885f3c8 ffff8801cd16f9c8 [ 36.057032] Call Trace: [ 36.059598] [] zap_huge_pmd+0x203/0x510 [ 36.065193] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 36.071746] [] unmap_single_vma+0xea3/0x1240 [ 36.077782] [] ? vm_normal_page+0x280/0x280 [ 36.083731] [] ? __put_single_page+0x60/0x60 [ 36.089770] [] unmap_vmas+0x81/0xd0 [ 36.095023] [] exit_mmap+0x1c9/0x3a0 [ 36.100361] [] ? SyS_remap_file_pages+0x870/0x870 [ 36.106830] [] ? up_write+0x1a/0x60 [ 36.112131] [] mmput+0xf8/0x2d0 [ 36.117054] [] do_exit+0x8d8/0x26b0 [ 36.122430] [] ? file_map_prot_check+0x193/0x310 [ 36.128845] [] ? release_task.part.17+0x1200/0x1200 [ 36.135543] [] ? SyS_mprotect+0x41e/0x640 [ 36.141393] [] ? up_write+0x1a/0x60 [ 36.146661] [] ? SyS_mprotect+0x423/0x640 [ 36.152479] [] do_group_exit+0x111/0x330 [ 36.158169] [] ? do_group_exit+0x330/0x330 [ 36.164095] [] SyS_exit_group+0x1d/0x20 [ 36.169725] [] do_fast_syscall_32+0x324/0x8b0 [ 36.175861] [] sysenter_flags_fixed+0xd/0x1a [ 36.181894] 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 [ 36.209013] RIP [] page_remove_rmap+0x2e/0x260 [ 36.215364] RSP [ 36.218962] CR2: ffffeafff8ca8008 [ 36.222391] ---[ end trace 73b1d1968ffe92a6 ]--- [ 36.227122] Kernel panic - not syncing: Fatal exception [ 36.232775] Dumping ftrace buffer: [ 36.236300] (ftrace buffer empty) [ 36.239980] Kernel Offset: disabled [ 36.243578] Rebooting in 86400 seconds..