[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.829378] 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: [ 27.771497] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 28.227383] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 28.977280] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) [ 29.170989] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. [ 34.836340] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) executing program [ 34.925906] BUG: unable to handle kernel paging request at ffffeafff8d48008 [ 34.933244] IP: [] page_remove_rmap+0x2e/0x260 [ 34.939489] PGD 0 [ 34.941729] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.946674] Dumping ftrace buffer: [ 34.950191] (ftrace buffer empty) [ 34.953874] Modules linked in: [ 34.957160] CPU: 0 PID: 3754 Comm: syz-executor899 Not tainted 4.4.149-gf76bdbd #82 [ 34.964925] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.974253] task: ffff8801cbc86000 task.stack: ffff8801cbfe8000 [ 34.980280] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.988953] RSP: 0018:ffff8801cbfef9c0 EFLAGS: 00010246 [ 34.994377] RAX: dffffc0000000000 RBX: ffffeafff8d48000 RCX: 0000000000000000 [ 35.001620] RDX: 1ffffd5fff1a9001 RSI: ffffffff814bc8bf RDI: ffffeafff8d48008 [ 35.008862] RBP: ffff8801cbfef9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 35.016109] R10: 0000000000000001 R11: ffff8801cbc86000 R12: 0000000000000001 [ 35.023352] R13: 1ffff100397fdf3e R14: ffff8801cbfc0800 R15: ffffeafff8d48000 [ 35.030598] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.038796] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.044652] CR2: ffffeafff8d48008 CR3: 00000001cbff5000 CR4: 00000000001606f0 [ 35.051914] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.059204] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.066445] Stack: [ 35.068566] ffff8801cbfefc50 0000000000000001 ffff8801cbfefa78 ffffffff8150a443 [ 35.076558] 00003ffe352001e0 00003ffe352001e0 0000000041b58ab3 ffffffff841ef837 [ 35.084533] ffffffff8150a240 00000000000004f0 ffff8800b15ec580 ffff8801cbfefa40 [ 35.092524] Call Trace: [ 35.095097] [] zap_huge_pmd+0x203/0x510 [ 35.100698] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 35.107249] [] unmap_single_vma+0xea3/0x1240 [ 35.113278] [] ? vm_normal_page+0x230/0x230 [ 35.119222] [] ? __put_single_page+0x60/0x60 [ 35.125253] [] unmap_vmas+0x81/0xd0 [ 35.130517] [] exit_mmap+0x1c9/0x3a0 [ 35.135855] [] ? SyS_remap_file_pages+0x870/0x870 [ 35.142329] [] ? kmem_cache_free+0x2b4/0x340 [ 35.148363] [] mmput+0xf8/0x2d0 [ 35.153355] [] do_exit+0x8d8/0x26b0 [ 35.158655] [] ? file_map_prot_check+0x193/0x310 [ 35.165048] [] ? release_task.part.17+0x1200/0x1200 [ 35.171700] [] ? SyS_mprotect+0x41e/0x640 [ 35.177469] [] ? up_write+0x1a/0x60 [ 35.182717] [] ? SyS_mprotect+0x423/0x640 [ 35.188501] [] do_group_exit+0x111/0x330 [ 35.194188] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 35.200649] [] SyS_exit_group+0x1d/0x20 [ 35.206264] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 35.212811] 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 [ 35.239537] RIP [] page_remove_rmap+0x2e/0x260 [ 35.245859] RSP [ 35.249455] CR2: ffffeafff8d48008 [ 35.252882] ---[ end trace 70698b3a40f20432 ]--- [ 35.257611] Kernel panic - not syncing: Fatal exception [ 35.263307] Dumping ftrace buffer: [ 35.266829] (ftrace buffer empty) [ 35.270519] Kernel Offset: disabled [ 35.274118] Rebooting in 86400 seconds..