[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.581079] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.146593] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 21.459784] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.144702] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) [ 22.320168] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. [ 28.117497] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) executing program [ 28.207580] BUG: unable to handle kernel paging request at ffffeafff8cf0008 [ 28.214987] IP: [] page_remove_rmap+0x2e/0x260 [ 28.221266] PGD 0 [ 28.223520] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.228470] Dumping ftrace buffer: [ 28.231984] (ftrace buffer empty) [ 28.235681] Modules linked in: [ 28.238984] CPU: 0 PID: 3768 Comm: syz-executor576 Not tainted 4.4.150-g5541782 #19 [ 28.246768] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.256097] task: ffff8801cb77e000 task.stack: ffff8801d79d0000 [ 28.262127] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.270802] RSP: 0018:ffff8801d79d7948 EFLAGS: 00010246 [ 28.276224] RAX: dffffc0000000000 RBX: ffffeafff8cf0000 RCX: 0000000000000000 [ 28.283467] RDX: 1ffffd5fff19e001 RSI: ffffffff814bceaf RDI: ffffeafff8cf0008 [ 28.290716] RBP: ffff8801d79d7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.297960] R10: 0000000000000001 R11: ffff8801cb77e000 R12: 0000000000000001 [ 28.305223] R13: 1ffff1003af3af2f R14: ffff8801d107b800 R15: ffffeafff8cf0000 [ 28.312470] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.320672] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.326528] CR2: ffffeafff8cf0008 CR3: 00000001d1a40000 CR4: 00000000001606f0 [ 28.333774] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.341019] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.348263] Stack: [ 28.350387] ffff8801d79d7bd8 0000000000000001 ffff8801d79d7a00 ffffffff8150ad13 [ 28.359767] 00003ffe33c001e0 00003ffe33c001e0 0000000041b58ab3 ffffffff841ef837 [ 28.367753] ffffffff8150ab10 00000000000004f0 ffff8801cb5175d8 ffff8801d79d79c8 [ 28.375766] Call Trace: [ 28.378332] [] zap_huge_pmd+0x203/0x510 [ 28.383929] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.390485] [] unmap_single_vma+0xea3/0x1240 [ 28.396521] [] ? vm_normal_page+0x280/0x280 [ 28.402466] [] ? __put_single_page+0x60/0x60 [ 28.408497] [] unmap_vmas+0x81/0xd0 [ 28.413748] [] exit_mmap+0x1c9/0x3a0 [ 28.419087] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.425555] [] ? up_write+0x1a/0x60 [ 28.430808] [] mmput+0xf8/0x2d0 [ 28.435712] [] do_exit+0x8d8/0x26b0 [ 28.440964] [] ? file_map_prot_check+0x193/0x310 [ 28.447372] [] ? release_task.part.17+0x1200/0x1200 [ 28.454030] [] ? SyS_mprotect+0x41e/0x640 [ 28.459821] [] ? up_write+0x1a/0x60 [ 28.465075] [] ? SyS_mprotect+0x423/0x640 [ 28.470846] [] do_group_exit+0x111/0x330 [ 28.476532] [] ? do_group_exit+0x330/0x330 [ 28.482390] [] SyS_exit_group+0x1d/0x20 [ 28.487987] [] do_fast_syscall_32+0x324/0x8b0 [ 28.494107] [] sysenter_flags_fixed+0xd/0x1a [ 28.500133] 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 [ 28.527405] RIP [] page_remove_rmap+0x2e/0x260 [ 28.533771] RSP [ 28.537371] CR2: ffffeafff8cf0008 [ 28.540798] ---[ end trace 6a441b475ed4ed3b ]--- [ 28.545525] Kernel panic - not syncing: Fatal exception [ 28.551185] Dumping ftrace buffer: [ 28.554702] (ftrace buffer empty) [ 28.558390] Kernel Offset: disabled [ 28.561997] Rebooting in 86400 seconds..