[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.026945] 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: [ 20.893013] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.340617] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.992076] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) [ 22.156714] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) Warning: Permanently added '10.128.10.53' (ECDSA) to the list of known hosts. [ 27.760628] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) executing program [ 27.846977] BUG: unable to handle kernel paging request at ffffeafff8bc8008 [ 27.854371] IP: [] page_remove_rmap+0x2e/0x260 [ 27.860653] PGD 0 [ 27.862921] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.867926] Dumping ftrace buffer: [ 27.871449] (ftrace buffer empty) [ 27.875148] Modules linked in: [ 27.878463] CPU: 1 PID: 3691 Comm: syz-executor389 Not tainted 4.4.149-gf76bdbd #18 [ 27.886285] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.895672] task: ffff8800b24d3000 task.stack: ffff8801cda70000 [ 27.901713] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 27.910484] RSP: 0018:ffff8801cda77948 EFLAGS: 00010246 [ 27.915920] RAX: dffffc0000000000 RBX: ffffeafff8bc8000 RCX: 0000000000000000 [ 27.923251] RDX: 1ffffd5fff179001 RSI: ffffffff814bc8bf RDI: ffffeafff8bc8008 [ 27.930520] RBP: ffff8801cda77958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 27.937775] R10: 0000000000000001 R11: ffff8800b24d3000 R12: 0000000000000001 [ 27.945030] R13: 1ffff10039b4ef2f R14: ffff8801d07d8800 R15: ffffeafff8bc8000 [ 27.952290] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.960501] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.966376] CR2: ffffeafff8bc8008 CR3: 00000001d1b5e000 CR4: 00000000001606f0 [ 27.973632] Stack: [ 27.975767] ffff8801cda77bd8 0000000000000001 ffff8801cda77a00 ffffffff8150a443 [ 27.983862] 00003ffe2f2001e0 00003ffe2f2001e0 0000000041b58ab3 ffffffff841ef837 [ 27.992024] ffffffff8150a240 00000000000004f0 ffff8800b2729478 ffff8801cda779c8 [ 28.000246] Call Trace: [ 28.002840] [] zap_huge_pmd+0x203/0x510 [ 28.008453] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.015107] [] unmap_single_vma+0xea3/0x1240 [ 28.021197] [] ? vm_normal_page+0x230/0x230 [ 28.027157] [] ? __put_single_page+0x60/0x60 [ 28.033199] [] unmap_vmas+0x81/0xd0 [ 28.038463] [] exit_mmap+0x1c9/0x3a0 [ 28.043833] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.050421] [] ? up_write+0x1a/0x60 [ 28.055686] [] mmput+0xf8/0x2d0 [ 28.060600] [] do_exit+0x8d8/0x26b0 [ 28.065920] [] ? file_map_prot_check+0x193/0x310 [ 28.072310] [] ? release_task.part.17+0x1200/0x1200 [ 28.078970] [] ? SyS_mprotect+0x41e/0x640 [ 28.084756] [] ? up_write+0x1a/0x60 [ 28.090019] [] ? SyS_mprotect+0x423/0x640 [ 28.095825] [] do_group_exit+0x111/0x330 [ 28.101522] [] ? do_group_exit+0x330/0x330 [ 28.107391] [] SyS_exit_group+0x1d/0x20 [ 28.113047] [] do_fast_syscall_32+0x324/0x8b0 [ 28.119181] [] sysenter_flags_fixed+0xd/0x1a [ 28.125220] Code: e5 41 54 53 48 89 fb e8 e1 77 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 b3 77 e9 ff f0 83 43 18 ff 78 [ 28.153224] RIP [] page_remove_rmap+0x2e/0x260 [ 28.159577] RSP [ 28.163186] CR2: ffffeafff8bc8008 [ 28.166625] ---[ end trace f17ce0747576e559 ]--- [ 28.171366] Kernel panic - not syncing: Fatal exception [ 28.177181] Dumping ftrace buffer: [ 28.180716] (ftrace buffer empty) [ 28.184413] Kernel Offset: disabled [ 28.188025] Rebooting in 86400 seconds..