[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.881138] 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: [ 24.557585] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.965456] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.735368] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) [ 25.902451] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.10.39' (ECDSA) to the list of known hosts. [ 31.431504] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) executing program [ 31.528478] BUG: unable to handle kernel paging request at ffffeafffd3f0008 [ 31.535874] IP: [] page_remove_rmap+0x2e/0x260 [ 31.542156] PGD 0 [ 31.544415] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.549379] Dumping ftrace buffer: [ 31.552902] (ftrace buffer empty) [ 31.556598] Modules linked in: [ 31.559904] CPU: 0 PID: 3833 Comm: syz-executor446 Not tainted 4.4.150-g5541782 #19 [ 31.567689] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.577033] task: ffff8800acd09800 task.stack: ffff8800bb860000 [ 31.583075] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.591779] RSP: 0018:ffff8800bb867948 EFLAGS: 00010246 [ 31.597214] RAX: dffffc0000000000 RBX: ffffeafffd3f0000 RCX: 0000000000000000 [ 31.604472] RDX: 1ffffd5fffa7e001 RSI: ffffffff814bceaf RDI: ffffeafffd3f0008 [ 31.611730] RBP: ffff8800bb867958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.618992] R10: 0000000000000001 R11: ffff8800acd09800 R12: 0000000000000001 [ 31.626251] R13: 1ffff1001770cf2f R14: ffff8800b1465800 R15: ffffeafffd3f0000 [ 31.633511] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.641735] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.647614] CR2: ffffeafffd3f0008 CR3: 00000000af46f000 CR4: 00000000001606f0 [ 31.654876] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.662309] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.669584] Stack: [ 31.671721] ffff8800bb867bd8 0000000000000001 ffff8800bb867a00 ffffffff8150ad13 [ 31.679922] 00003fff4fc001e0 00003fff4fc001e0 0000000041b58ab3 ffffffff841ef837 [ 31.687926] ffffffff8150ab10 00000000000004f0 ffff8800af5917e8 ffff8800bb8679c8 [ 31.695938] Call Trace: [ 31.698515] [] zap_huge_pmd+0x203/0x510 [ 31.704133] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.710707] [] unmap_single_vma+0xea3/0x1240 [ 31.716759] [] ? vm_normal_page+0x280/0x280 [ 31.722728] [] ? __put_single_page+0x60/0x60 [ 31.728784] [] unmap_vmas+0x81/0xd0 [ 31.734058] [] exit_mmap+0x1c9/0x3a0 [ 31.739422] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.745913] [] ? up_write+0x1a/0x60 [ 31.751189] [] mmput+0xf8/0x2d0 [ 31.756118] [] do_exit+0x8d8/0x26b0 [ 31.761393] [] ? file_map_prot_check+0x193/0x310 [ 31.767795] [] ? release_task.part.17+0x1200/0x1200 [ 31.774472] [] ? SyS_mprotect+0x41e/0x640 [ 31.780266] [] ? up_write+0x1a/0x60 [ 31.785541] [] ? SyS_mprotect+0x423/0x640 [ 31.791337] [] do_group_exit+0x111/0x330 [ 31.797047] [] ? do_group_exit+0x330/0x330 [ 31.802927] [] SyS_exit_group+0x1d/0x20 [ 31.808545] [] do_fast_syscall_32+0x324/0x8b0 [ 31.814687] [] sysenter_flags_fixed+0xd/0x1a [ 31.820729] 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 [ 31.847680] RIP [] page_remove_rmap+0x2e/0x260 [ 31.854043] RSP [ 31.857652] CR2: ffffeafffd3f0008 [ 31.861092] ---[ end trace 37c7dc9466a5da04 ]--- [ 31.865838] Kernel panic - not syncing: Fatal exception [ 31.871587] Dumping ftrace buffer: [ 31.875128] (ftrace buffer empty) [ 31.878835] Kernel Offset: disabled [ 31.882449] Rebooting in 86400 seconds..