[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.428224] 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: [ 25.489218] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.776970] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.443858] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 28.856681] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts. [ 34.608824] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) executing program [ 34.697670] BUG: unable to handle kernel paging request at ffffeafffd410008 [ 34.705021] IP: [] page_remove_rmap+0x2e/0x260 [ 34.711274] PGD 0 [ 34.713516] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.718479] Dumping ftrace buffer: [ 34.721995] (ftrace buffer empty) [ 34.725683] Modules linked in: [ 34.728967] CPU: 1 PID: 3748 Comm: syz-executor080 Not tainted 4.4.150-g5541782 #83 [ 34.736755] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.746294] task: ffff8801cc461800 task.stack: ffff8800b0128000 [ 34.752325] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.761008] RSP: 0018:ffff8800b012f9c0 EFLAGS: 00010246 [ 34.766428] RAX: dffffc0000000000 RBX: ffffeafffd410000 RCX: 0000000000000000 [ 34.773673] RDX: 1ffffd5fffa82001 RSI: ffffffff814bceaf RDI: ffffeafffd410008 [ 34.780917] RBP: ffff8800b012f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 34.788160] R10: 0000000000000001 R11: ffff8801cc461800 R12: 0000000000000001 [ 34.795405] R13: 1ffff10016025f3e R14: ffff8800b743d800 R15: ffffeafffd410000 [ 34.802648] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.810846] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.816703] CR2: ffffeafffd410008 CR3: 00000000b557f000 CR4: 00000000001606f0 [ 34.823952] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.831195] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.838440] Stack: [ 34.840563] ffff8800b012fc50 0000000000000001 ffff8800b012fa78 ffffffff8150ad13 [ 34.848552] 00003fff504001e0 00003fff504001e0 0000000041b58ab3 ffffffff841ef837 [ 34.856552] ffffffff8150ab10 00000000000004f0 ffff8801cc6ee268 ffff8800b012fa40 [ 34.864552] Call Trace: [ 34.867119] [] zap_huge_pmd+0x203/0x510 [ 34.872717] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.879273] [] unmap_single_vma+0xea3/0x1240 [ 34.885305] [] ? vm_normal_page+0x280/0x280 [ 34.891250] [] ? __put_single_page+0x60/0x60 [ 34.897280] [] unmap_vmas+0x81/0xd0 [ 34.902534] [] exit_mmap+0x1c9/0x3a0 [ 34.907894] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.914366] [] ? up_write+0x1a/0x60 [ 34.919624] [] mmput+0xf8/0x2d0 [ 34.924529] [] do_exit+0x8d8/0x26b0 [ 34.929798] [] ? file_map_prot_check+0x193/0x310 [ 34.936196] [] ? release_task.part.17+0x1200/0x1200 [ 34.942838] [] ? SyS_mprotect+0x41e/0x640 [ 34.948611] [] ? up_write+0x1a/0x60 [ 34.953862] [] ? SyS_mprotect+0x423/0x640 [ 34.959642] [] do_group_exit+0x111/0x330 [ 34.965421] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.971893] [] SyS_exit_group+0x1d/0x20 [ 34.977496] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.984046] 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 [ 35.011010] RIP [] page_remove_rmap+0x2e/0x260 [ 35.017341] RSP [ 35.020940] CR2: ffffeafffd410008 [ 35.024368] ---[ end trace dc9abb13373b3d63 ]--- [ 35.029099] Kernel panic - not syncing: Fatal exception [ 35.034904] Dumping ftrace buffer: [ 35.038421] (ftrace buffer empty) [ 35.042107] Kernel Offset: disabled [ 35.045706] Rebooting in 86400 seconds..