[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.208010] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.028745] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 26.352530] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 27.023442] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) [ 33.443414] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) Warning: Permanently added '10.128.10.4' (ECDSA) to the list of known hosts. [ 38.919143] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) executing program [ 39.007274] BUG: unable to handle kernel paging request at ffffeafffd478008 [ 39.014654] IP: [] page_remove_rmap+0x2e/0x260 [ 39.020916] PGD 0 [ 39.023172] Oops: 0000 [#1] PREEMPT SMP KASAN [ 39.028139] Dumping ftrace buffer: [ 39.031651] (ftrace buffer empty) [ 39.035335] Modules linked in: [ 39.038628] CPU: 0 PID: 3853 Comm: syz-executor431 Not tainted 4.4.148-gf057ff9 #81 [ 39.046395] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.055731] task: ffff8800b5864800 task.stack: ffff8801d9688000 [ 39.061774] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 39.070447] RSP: 0018:ffff8801d968f9c0 EFLAGS: 00010246 [ 39.075885] RAX: dffffc0000000000 RBX: ffffeafffd478000 RCX: 0000000000000000 [ 39.083147] RDX: 1ffffd5fffa8f001 RSI: ffffffff814bc75f RDI: ffffeafffd478008 [ 39.090395] RBP: ffff8801d968f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 39.097643] R10: 0000000000000001 R11: ffff8800b5864800 R12: 0000000000000001 [ 39.104889] R13: 1ffff1003b2d1f3e R14: ffff8800ad817800 R15: ffffeafffd478000 [ 39.112131] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 39.120401] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.126278] CR2: ffffeafffd478008 CR3: 00000000ad836000 CR4: 00000000001606f0 [ 39.133526] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.140774] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.148140] Stack: [ 39.150268] ffff8801d968fc50 0000000000000001 ffff8801d968fa78 ffffffff8150a1f3 [ 39.158336] 00003fff51e001e0 00003fff51e001e0 0000000041b58ab3 ffffffff841ef82f [ 39.166323] ffffffff81509ff0 00000000000004f0 ffff8800bbbc6688 ffff8801d968fa40 [ 39.174327] Call Trace: [ 39.176897] [] zap_huge_pmd+0x203/0x510 [ 39.182503] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 39.189060] [] unmap_single_vma+0xea3/0x1240 [ 39.195422] [] ? vm_normal_page+0x230/0x230 [ 39.201479] [] ? __put_single_page+0x60/0x60 [ 39.207518] [] unmap_vmas+0x81/0xd0 [ 39.212772] [] exit_mmap+0x1c9/0x3a0 [ 39.218113] [] ? SyS_remap_file_pages+0x870/0x870 [ 39.224610] [] ? up_write+0x1a/0x60 [ 39.229986] [] mmput+0xf8/0x2d0 [ 39.234891] [] do_exit+0x8d8/0x26b0 [ 39.240291] [] ? file_map_prot_check+0x193/0x310 [ 39.246699] [] ? release_task.part.17+0x1200/0x1200 [ 39.253349] [] ? SyS_mprotect+0x41e/0x640 [ 39.259129] [] ? up_write+0x1a/0x60 [ 39.264383] [] ? SyS_mprotect+0x423/0x640 [ 39.270156] [] do_group_exit+0x111/0x330 [ 39.275930] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 39.282410] [] SyS_exit_group+0x1d/0x20 [ 39.288024] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 39.294646] 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 [ 39.321786] RIP [] page_remove_rmap+0x2e/0x260 [ 39.328120] RSP [ 39.331718] CR2: ffffeafffd478008 [ 39.335150] ---[ end trace 43c22c3f9684cceb ]--- [ 39.339945] Kernel panic - not syncing: Fatal exception [ 39.345668] Dumping ftrace buffer: [ 39.349191] (ftrace buffer empty) [ 39.352876] Kernel Offset: disabled [ 39.356480] Rebooting in 86400 seconds..