[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.106722] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.134027] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.447629] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.168275] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) [ 25.333852] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. [ 30.962714] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) executing program [ 31.052697] BUG: unable to handle kernel paging request at ffffeafff8d48008 [ 31.060181] IP: [] page_remove_rmap+0x2e/0x260 [ 31.066441] PGD 0 [ 31.068790] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.073750] Dumping ftrace buffer: [ 31.077369] (ftrace buffer empty) [ 31.081057] Modules linked in: [ 31.084409] CPU: 0 PID: 3834 Comm: syz-executor197 Not tainted 4.4.150-g5541782 #19 [ 31.092183] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.101575] task: ffff8800ac096000 task.stack: ffff8801d7a28000 [ 31.107611] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.116305] RSP: 0018:ffff8801d7a2f948 EFLAGS: 00010246 [ 31.121728] RAX: dffffc0000000000 RBX: ffffeafff8d48000 RCX: 0000000000000000 [ 31.128978] RDX: 1ffffd5fff1a9001 RSI: ffffffff814bceaf RDI: ffffeafff8d48008 [ 31.136223] RBP: ffff8801d7a2f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.143468] R10: 0000000000000001 R11: ffff8800ac096000 R12: 0000000000000001 [ 31.150711] R13: 1ffff1003af45f2f R14: ffff8801c9e15800 R15: ffffeafff8d48000 [ 31.157957] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.166157] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.172019] CR2: ffffeafff8d48008 CR3: 00000001c7899000 CR4: 00000000001606f0 [ 31.179375] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.186681] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.193938] Stack: [ 31.196066] ffff8801d7a2fbd8 0000000000000001 ffff8801d7a2fa00 ffffffff8150ad13 [ 31.204243] 00003ffe352001e0 00003ffe352001e0 0000000041b58ab3 ffffffff841ef837 [ 31.212345] ffffffff8150ab10 00000000000004f0 ffff8801c9cdbd10 ffff8801d7a2f9c8 [ 31.220426] Call Trace: [ 31.222998] [] zap_huge_pmd+0x203/0x510 [ 31.228604] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.235163] [] unmap_single_vma+0xea3/0x1240 [ 31.241195] [] ? vm_normal_page+0x280/0x280 [ 31.247146] [] ? __put_single_page+0x60/0x60 [ 31.253179] [] unmap_vmas+0x81/0xd0 [ 31.258432] [] exit_mmap+0x1c9/0x3a0 [ 31.263773] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.270244] [] ? up_write+0x1a/0x60 [ 31.275502] [] mmput+0xf8/0x2d0 [ 31.280407] [] do_exit+0x8d8/0x26b0 [ 31.285662] [] ? file_map_prot_check+0x193/0x310 [ 31.292048] [] ? release_task.part.17+0x1200/0x1200 [ 31.298702] [] ? SyS_mprotect+0x41e/0x640 [ 31.304523] [] ? up_write+0x1a/0x60 [ 31.309779] [] ? SyS_mprotect+0x423/0x640 [ 31.315553] [] do_group_exit+0x111/0x330 [ 31.321244] [] ? do_group_exit+0x330/0x330 [ 31.327110] [] SyS_exit_group+0x1d/0x20 [ 31.332763] [] do_fast_syscall_32+0x324/0x8b0 [ 31.338893] [] sysenter_flags_fixed+0xd/0x1a [ 31.344922] 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 [ 31.372123] RIP [] page_remove_rmap+0x2e/0x260 [ 31.378481] RSP [ 31.382096] CR2: ffffeafff8d48008 [ 31.385531] ---[ end trace 8298e14c539a421f ]--- [ 31.390263] Kernel panic - not syncing: Fatal exception [ 31.396042] Dumping ftrace buffer: [ 31.396046] (ftrace buffer empty) [ 31.396054] Kernel Offset: disabled [ 31.406984] Rebooting in 86400 seconds..