[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.556118] 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: [ 26.681451] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.043653] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.676821] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) [ 27.861305] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 33.479145] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) executing program [ 33.565948] BUG: unable to handle kernel paging request at ffffeafff8ca8008 [ 33.573304] IP: [] page_remove_rmap+0x2e/0x260 [ 33.579544] PGD 0 [ 33.581781] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.586744] Dumping ftrace buffer: [ 33.590268] (ftrace buffer empty) [ 33.593956] Modules linked in: [ 33.597242] CPU: 1 PID: 3839 Comm: syz-executor164 Not tainted 4.4.150-g5541782 #19 [ 33.605008] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.614352] task: ffff8801d90fb000 task.stack: ffff8801d0e58000 [ 33.620379] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.629068] RSP: 0018:ffff8801d0e5f948 EFLAGS: 00010246 [ 33.634488] RAX: dffffc0000000000 RBX: ffffeafff8ca8000 RCX: 0000000000000000 [ 33.641730] RDX: 1ffffd5fff195001 RSI: ffffffff814bceaf RDI: ffffeafff8ca8008 [ 33.648994] RBP: ffff8801d0e5f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.656239] R10: 0000000000000001 R11: ffff8801d90fb000 R12: 0000000000000001 [ 33.663497] R13: 1ffff1003a1cbf2f R14: ffff8801d1baa800 R15: ffffeafff8ca8000 [ 33.670743] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.678947] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.684802] CR2: ffffeafff8ca8008 CR3: 00000001d19e8000 CR4: 00000000001606f0 [ 33.692046] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.699312] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.706559] Stack: [ 33.708680] ffff8801d0e5fbd8 0000000000000001 ffff8801d0e5fa00 ffffffff8150ad13 [ 33.716662] 00003ffe32a001e0 00003ffe32a001e0 0000000041b58ab3 ffffffff841ef837 [ 33.724650] ffffffff8150ab10 00000000000004f0 ffff8800bb01d630 ffff8801d0e5f9c8 [ 33.732631] Call Trace: [ 33.735198] [] zap_huge_pmd+0x203/0x510 [ 33.740794] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.747348] [] unmap_single_vma+0xea3/0x1240 [ 33.753381] [] ? vm_normal_page+0x280/0x280 [ 33.759327] [] ? __put_single_page+0x60/0x60 [ 33.765357] [] unmap_vmas+0x81/0xd0 [ 33.770615] [] exit_mmap+0x1c9/0x3a0 [ 33.775956] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.782422] [] ? up_write+0x1a/0x60 [ 33.787672] [] mmput+0xf8/0x2d0 [ 33.792802] [] do_exit+0x8d8/0x26b0 [ 33.798057] [] ? file_map_prot_check+0x193/0x310 [ 33.804435] [] ? release_task.part.17+0x1200/0x1200 [ 33.811076] [] ? SyS_mprotect+0x41e/0x640 [ 33.816847] [] ? up_write+0x1a/0x60 [ 33.822095] [] ? SyS_mprotect+0x423/0x640 [ 33.827864] [] do_group_exit+0x111/0x330 [ 33.833547] [] ? do_group_exit+0x330/0x330 [ 33.839424] [] SyS_exit_group+0x1d/0x20 [ 33.845023] [] do_fast_syscall_32+0x324/0x8b0 [ 33.851141] [] sysenter_flags_fixed+0xd/0x1a [ 33.857168] 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 [ 33.883971] RIP [] page_remove_rmap+0x2e/0x260 [ 33.890298] RSP [ 33.893895] CR2: ffffeafff8ca8008 [ 33.897320] ---[ end trace 8c8a18909de5ece4 ]--- [ 33.902071] Kernel panic - not syncing: Fatal exception [ 33.907771] Dumping ftrace buffer: [ 33.911288] (ftrace buffer empty) [ 33.914970] Kernel Offset: disabled [ 33.918572] Rebooting in 86400 seconds..