[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.890797] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.450427] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 21.723278] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.399673] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) [ 22.578602] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) Warning: Permanently added '10.128.10.23' (ECDSA) to the list of known hosts. [ 28.260943] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) executing program [ 28.350797] BUG: unable to handle kernel paging request at ffffeafff8d28008 [ 28.358163] IP: [] page_remove_rmap+0x2e/0x260 [ 28.364409] PGD 0 [ 28.366647] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.371638] Dumping ftrace buffer: [ 28.375149] (ftrace buffer empty) [ 28.378831] Modules linked in: [ 28.382118] CPU: 1 PID: 3731 Comm: syz-executor187 Not tainted 4.4.150-g5541782 #83 [ 28.389881] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.399214] task: ffff8801cc8c8000 task.stack: ffff8801d87f0000 [ 28.405246] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.413947] RSP: 0018:ffff8801d87f79c0 EFLAGS: 00010246 [ 28.419387] RAX: dffffc0000000000 RBX: ffffeafff8d28000 RCX: 0000000000000000 [ 28.426634] RDX: 1ffffd5fff1a5001 RSI: ffffffff814bceaf RDI: ffffeafff8d28008 [ 28.433875] RBP: ffff8801d87f79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.441115] R10: 0000000000000001 R11: ffff8801cc8c8000 R12: 0000000000000001 [ 28.448357] R13: 1ffff1003b0fef3e R14: ffff8801d12e1800 R15: ffffeafff8d28000 [ 28.455604] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.463818] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.469688] CR2: ffffeafff8d28008 CR3: 00000001d1396000 CR4: 00000000001606f0 [ 28.476934] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.484215] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.491459] Stack: [ 28.493581] ffff8801d87f7c50 0000000000000001 ffff8801d87f7a78 ffffffff8150ad13 [ 28.501565] 00003ffe34a001e0 00003ffe34a001e0 0000000041b58ab3 ffffffff841ef837 [ 28.509548] ffffffff8150ab10 00000000000004f0 ffff8800b1213b00 ffff8801d87f7a40 [ 28.517527] Call Trace: [ 28.520104] [] zap_huge_pmd+0x203/0x510 [ 28.525705] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.532257] [] unmap_single_vma+0xea3/0x1240 [ 28.538291] [] ? vm_normal_page+0x280/0x280 [ 28.544237] [] ? __put_single_page+0x60/0x60 [ 28.550269] [] unmap_vmas+0x81/0xd0 [ 28.555519] [] exit_mmap+0x1c9/0x3a0 [ 28.560858] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.567354] [] ? up_write+0x1a/0x60 [ 28.572606] [] mmput+0xf8/0x2d0 [ 28.577509] [] do_exit+0x8d8/0x26b0 [ 28.582761] [] ? file_map_prot_check+0x193/0x310 [ 28.589168] [] ? release_task.part.17+0x1200/0x1200 [ 28.595823] [] ? SyS_mprotect+0x41e/0x640 [ 28.601597] [] ? up_write+0x1a/0x60 [ 28.606845] [] ? SyS_mprotect+0x423/0x640 [ 28.612615] [] do_group_exit+0x111/0x330 [ 28.618348] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.624812] [] SyS_exit_group+0x1d/0x20 [ 28.630417] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 28.636970] 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 [ 28.663995] RIP [] page_remove_rmap+0x2e/0x260 [ 28.670337] RSP [ 28.673985] CR2: ffffeafff8d28008 [ 28.677410] ---[ end trace d41311faa07a6dd9 ]--- [ 28.682148] Kernel panic - not syncing: Fatal exception [ 28.687805] Dumping ftrace buffer: [ 28.691326] (ftrace buffer empty) [ 28.695010] Kernel Offset: disabled [ 28.698608] Rebooting in 86400 seconds..