[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.042205] 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: [ 27.304919] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.776590] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 28.394557] random: sshd: uninitialized urandom read (32 bytes read, 57 bits of entropy available) [ 33.726017] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) Warning: Permanently added '10.128.10.60' (ECDSA) to the list of known hosts. [ 39.373400] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) executing program [ 39.463014] BUG: unable to handle kernel paging request at ffffeafff8cd8008 [ 39.470370] IP: [] page_remove_rmap+0x2e/0x260 [ 39.476612] PGD 0 [ 39.478851] Oops: 0000 [#1] PREEMPT SMP KASAN [ 39.483795] Dumping ftrace buffer: [ 39.487306] (ftrace buffer empty) [ 39.491032] Modules linked in: [ 39.494315] CPU: 0 PID: 3701 Comm: syz-executor437 Not tainted 4.4.150-g5541782 #83 [ 39.502078] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.511476] task: ffff8800b2a96000 task.stack: ffff8801cdf10000 [ 39.517686] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 39.526501] RSP: 0018:ffff8801cdf179c0 EFLAGS: 00010246 [ 39.531995] RAX: dffffc0000000000 RBX: ffffeafff8cd8000 RCX: 0000000000000000 [ 39.539339] RDX: 1ffffd5fff19b001 RSI: ffffffff814bceaf RDI: ffffeafff8cd8008 [ 39.546592] RBP: ffff8801cdf179d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 39.553842] R10: 0000000000000001 R11: ffff8800b2a96000 R12: 0000000000000001 [ 39.561129] R13: 1ffff10039be2f3e R14: ffff8801cdf38800 R15: ffffeafff8cd8000 [ 39.568381] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 39.576679] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.582577] CR2: ffffeafff8cd8008 CR3: 00000001cdf7d000 CR4: 00000000001606f0 [ 39.589932] Stack: [ 39.592061] ffff8801cdf17c50 0000000000000001 ffff8801cdf17a78 ffffffff8150ad13 [ 39.600064] 00003ffe336001e0 00003ffe336001e0 0000000041b58ab3 ffffffff841ef837 [ 39.608056] ffffffff8150ab10 00000000000004f0 ffff8801cdf84f78 ffff8801cdf17a40 [ 39.616086] Call Trace: [ 39.618659] [] zap_huge_pmd+0x203/0x510 [ 39.624270] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 39.630824] [] unmap_single_vma+0xea3/0x1240 [ 39.636858] [] ? vm_normal_page+0x280/0x280 [ 39.642812] [] ? __put_single_page+0x60/0x60 [ 39.648850] [] unmap_vmas+0x81/0xd0 [ 39.654111] [] exit_mmap+0x1c9/0x3a0 [ 39.659465] [] ? SyS_remap_file_pages+0x870/0x870 [ 39.665995] [] ? up_write+0x1a/0x60 [ 39.671306] [] mmput+0xf8/0x2d0 [ 39.676223] [] do_exit+0x8d8/0x26b0 [ 39.681476] [] ? file_map_prot_check+0x193/0x310 [ 39.687861] [] ? release_task.part.17+0x1200/0x1200 [ 39.694508] [] ? SyS_mprotect+0x41e/0x640 [ 39.700349] [] ? up_write+0x1a/0x60 [ 39.705618] [] ? SyS_mprotect+0x423/0x640 [ 39.711532] [] do_group_exit+0x111/0x330 [ 39.717317] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 39.723797] [] SyS_exit_group+0x1d/0x20 [ 39.729402] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 39.735966] 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 [ 39.763373] RIP [] page_remove_rmap+0x2e/0x260 [ 39.769745] RSP [ 39.773357] CR2: ffffeafff8cd8008 [ 39.776784] ---[ end trace 654ffc95fa1aa483 ]--- [ 39.781570] Kernel panic - not syncing: Fatal exception [ 39.787257] Dumping ftrace buffer: [ 39.790846] (ftrace buffer empty) [ 39.794580] Kernel Offset: disabled [ 39.798188] Rebooting in 86400 seconds..