[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.428041] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.901611] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.292711] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 23.007840] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 23.164915] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.0.57' (ECDSA) to the list of known hosts. [ 28.782219] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) executing program [ 28.872961] BUG: unable to handle kernel paging request at ffffeafffd460008 [ 28.880385] IP: [] page_remove_rmap+0x2e/0x260 [ 28.886627] PGD 0 [ 28.888904] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.893894] Dumping ftrace buffer: [ 28.897406] (ftrace buffer empty) [ 28.901100] Modules linked in: [ 28.904401] CPU: 0 PID: 3784 Comm: syz-executor157 Not tainted 4.4.150-g5541782 #19 [ 28.912165] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.921493] task: ffff8801cbbde000 task.stack: ffff8800bba00000 [ 28.927551] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.936231] RSP: 0018:ffff8800bba07948 EFLAGS: 00010246 [ 28.941687] RAX: dffffc0000000000 RBX: ffffeafffd460000 RCX: 0000000000000000 [ 28.948943] RDX: 1ffffd5fffa8c001 RSI: ffffffff814bceaf RDI: ffffeafffd460008 [ 28.956184] RBP: ffff8800bba07958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.963451] R10: 0000000000000001 R11: ffff8801cbbde000 R12: 0000000000000001 [ 28.970694] R13: 1ffff10017740f2f R14: ffff8800b4884800 R15: ffffeafffd460000 [ 28.977951] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.986151] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.992004] CR2: ffffeafffd460008 CR3: 00000000b2e14000 CR4: 00000000001606f0 [ 28.999259] Stack: [ 29.001401] ffff8800bba07bd8 0000000000000001 ffff8800bba07a00 ffffffff8150ad13 [ 29.009408] 00003fff518001e0 00003fff518001e0 0000000041b58ab3 ffffffff841ef837 [ 29.017417] ffffffff8150ab10 00000000000004f0 ffff8800af54b7e8 ffff8800bba079c8 [ 29.025412] Call Trace: [ 29.027972] [] zap_huge_pmd+0x203/0x510 [ 29.033567] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.040118] [] unmap_single_vma+0xea3/0x1240 [ 29.046159] [] ? vm_normal_page+0x280/0x280 [ 29.052104] [] ? __put_single_page+0x60/0x60 [ 29.058144] [] unmap_vmas+0x81/0xd0 [ 29.063395] [] exit_mmap+0x1c9/0x3a0 [ 29.068729] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.075192] [] ? up_write+0x1a/0x60 [ 29.080440] [] mmput+0xf8/0x2d0 [ 29.085343] [] do_exit+0x8d8/0x26b0 [ 29.090607] [] ? file_map_prot_check+0x193/0x310 [ 29.096985] [] ? release_task.part.17+0x1200/0x1200 [ 29.103626] [] ? SyS_mprotect+0x41e/0x640 [ 29.109423] [] ? up_write+0x1a/0x60 [ 29.114675] [] ? SyS_mprotect+0x423/0x640 [ 29.120443] [] do_group_exit+0x111/0x330 [ 29.126123] [] ? do_group_exit+0x330/0x330 [ 29.131978] [] SyS_exit_group+0x1d/0x20 [ 29.137587] [] do_fast_syscall_32+0x324/0x8b0 [ 29.143732] [] sysenter_flags_fixed+0xd/0x1a [ 29.149757] 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 [ 29.176699] RIP [] page_remove_rmap+0x2e/0x260 [ 29.183037] RSP [ 29.186632] CR2: ffffeafffd460008 [ 29.190057] ---[ end trace 7aa75fce94234c27 ]--- [ 29.194781] Kernel panic - not syncing: Fatal exception [ 29.200438] Dumping ftrace buffer: [ 29.203957] (ftrace buffer empty) [ 29.207657] Kernel Offset: disabled [ 29.211259] Rebooting in 86400 seconds..