[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.007624] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.236485] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.736951] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.456659] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) [ 26.622307] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.10.59' (ECDSA) to the list of known hosts. [ 32.153155] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) executing program [ 32.244016] BUG: unable to handle kernel paging request at ffffeafffd3b8008 [ 32.251456] IP: [] page_remove_rmap+0x2e/0x260 [ 32.257700] PGD 0 [ 32.259936] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.264883] Dumping ftrace buffer: [ 32.268395] (ftrace buffer empty) [ 32.272078] Modules linked in: [ 32.275365] CPU: 1 PID: 3841 Comm: syz-executor185 Not tainted 4.4.150-g5541782 #19 [ 32.283128] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.292456] task: ffff8801d3863000 task.stack: ffff8800bb020000 [ 32.298485] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.307156] RSP: 0018:ffff8800bb027948 EFLAGS: 00010246 [ 32.312575] RAX: dffffc0000000000 RBX: ffffeafffd3b8000 RCX: 0000000000000000 [ 32.319822] RDX: 1ffffd5fffa77001 RSI: ffffffff814bceaf RDI: ffffeafffd3b8008 [ 32.327066] RBP: ffff8800bb027958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.334323] R10: 0000000000000001 R11: ffff8801d3863000 R12: 0000000000000001 [ 32.341570] R13: 1ffff10017604f2f R14: ffff8800b4701800 R15: ffffeafffd3b8000 [ 32.348825] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.357034] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.363030] CR2: ffffeafffd3b8008 CR3: 00000000b2925000 CR4: 00000000001606f0 [ 32.370275] Stack: [ 32.372399] ffff8800bb027bd8 0000000000000001 ffff8800bb027a00 ffffffff8150ad13 [ 32.380377] 00003fff4ee001e0 00003fff4ee001e0 0000000041b58ab3 ffffffff841ef837 [ 32.388368] ffffffff8150ab10 00000000000004f0 ffff8801cde7d840 ffff8800bb0279c8 [ 32.396362] Call Trace: [ 32.398929] [] zap_huge_pmd+0x203/0x510 [ 32.404524] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.411077] [] unmap_single_vma+0xea3/0x1240 [ 32.417107] [] ? vm_normal_page+0x280/0x280 [ 32.423050] [] ? __put_single_page+0x60/0x60 [ 32.429081] [] unmap_vmas+0x81/0xd0 [ 32.434329] [] exit_mmap+0x1c9/0x3a0 [ 32.439673] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.446153] [] ? kmem_cache_free+0x2b4/0x340 [ 32.452190] [] mmput+0xf8/0x2d0 [ 32.457194] [] do_exit+0x8d8/0x26b0 [ 32.462461] [] ? file_map_prot_check+0x193/0x310 [ 32.468837] [] ? release_task.part.17+0x1200/0x1200 [ 32.475486] [] ? SyS_mprotect+0x41e/0x640 [ 32.481255] [] ? up_write+0x1a/0x60 [ 32.486505] [] ? SyS_mprotect+0x423/0x640 [ 32.492288] [] do_group_exit+0x111/0x330 [ 32.497974] [] ? do_group_exit+0x330/0x330 [ 32.503843] [] SyS_exit_group+0x1d/0x20 [ 32.509442] [] do_fast_syscall_32+0x324/0x8b0 [ 32.515562] [] sysenter_flags_fixed+0xd/0x1a [ 32.521593] 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 [ 32.548401] RIP [] page_remove_rmap+0x2e/0x260 [ 32.554728] RSP [ 32.558325] CR2: ffffeafffd3b8008 [ 32.561756] ---[ end trace c2d6e0e3c2443349 ]--- [ 32.566483] Kernel panic - not syncing: Fatal exception [ 32.572120] Dumping ftrace buffer: [ 32.575640] (ftrace buffer empty) [ 32.579321] Kernel Offset: disabled [ 32.582926] Rebooting in 86400 seconds..