[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.137595] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.824926] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.216675] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.896931] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 28.061578] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 33.608726] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program [ 33.695631] BUG: unable to handle kernel paging request at ffffeafffd3c8008 [ 33.703006] IP: [] page_remove_rmap+0x2e/0x260 [ 33.709258] PGD 0 [ 33.711499] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.716450] Dumping ftrace buffer: [ 33.719964] (ftrace buffer empty) [ 33.723672] Modules linked in: [ 33.726960] CPU: 1 PID: 3695 Comm: syz-executor434 Not tainted 4.4.149-gf76bdbd #18 [ 33.734724] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.744052] task: ffff8801ceed0000 task.stack: ffff8800b25d0000 [ 33.750081] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.758756] RSP: 0018:ffff8800b25d7948 EFLAGS: 00010246 [ 33.764181] RAX: dffffc0000000000 RBX: ffffeafffd3c8000 RCX: 0000000000000000 [ 33.771440] RDX: 1ffffd5fffa79001 RSI: ffffffff814bc8bf RDI: ffffeafffd3c8008 [ 33.778690] RBP: ffff8800b25d7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.785963] R10: 0000000000000001 R11: ffff8801ceed0000 R12: 0000000000000001 [ 33.793222] R13: 1ffff100164baf2f R14: ffff8800b258b800 R15: ffffeafffd3c8000 [ 33.800467] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.808695] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.814548] CR2: ffffeafffd3c8008 CR3: 00000000b25bd000 CR4: 00000000001606f0 [ 33.821811] Stack: [ 33.823932] ffff8800b25d7bd8 0000000000000001 ffff8800b25d7a00 ffffffff8150a443 [ 33.831924] 00003fff4f2001e0 00003fff4f2001e0 0000000041b58ab3 ffffffff841ef837 [ 33.839967] ffffffff8150a240 00000000000004f0 ffff8800b71c1898 ffff8800b25d79c8 [ 33.848049] Call Trace: [ 33.850612] [] zap_huge_pmd+0x203/0x510 [ 33.856214] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.862766] [] unmap_single_vma+0xea3/0x1240 [ 33.868814] [] ? vm_normal_page+0x230/0x230 [ 33.874781] [] ? __put_single_page+0x60/0x60 [ 33.880814] [] unmap_vmas+0x81/0xd0 [ 33.886079] [] exit_mmap+0x1c9/0x3a0 [ 33.891432] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.897900] [] ? up_write+0x1a/0x60 [ 33.903169] [] mmput+0xf8/0x2d0 [ 33.908095] [] do_exit+0x8d8/0x26b0 [ 33.913350] [] ? file_map_prot_check+0x193/0x310 [ 33.919747] [] ? release_task.part.17+0x1200/0x1200 [ 33.926390] [] ? SyS_mprotect+0x41e/0x640 [ 33.932180] [] ? up_write+0x1a/0x60 [ 33.937430] [] ? SyS_mprotect+0x423/0x640 [ 33.943241] [] do_group_exit+0x111/0x330 [ 33.948924] [] ? do_group_exit+0x330/0x330 [ 33.954787] [] SyS_exit_group+0x1d/0x20 [ 33.960403] [] do_fast_syscall_32+0x324/0x8b0 [ 33.966525] [] sysenter_flags_fixed+0xd/0x1a [ 33.972556] 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 [ 33.999522] RIP [] page_remove_rmap+0x2e/0x260 [ 34.005856] RSP [ 34.009468] CR2: ffffeafffd3c8008 [ 34.012898] ---[ end trace cda165f4b86e0426 ]--- [ 34.017627] Kernel panic - not syncing: Fatal exception [ 34.023485] Dumping ftrace buffer: [ 34.027005] (ftrace buffer empty) [ 34.030690] Kernel Offset: disabled [ 34.034289] Rebooting in 86400 seconds..