[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.684403] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.848785] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 28.233490] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 28.852523] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) [ 29.027815] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) Warning: Permanently added '10.128.0.10' (ECDSA) to the list of known hosts. [ 34.696023] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) executing program [ 34.783605] BUG: unable to handle kernel paging request at ffffeafff8ba0008 [ 34.791133] IP: [] page_remove_rmap+0x2e/0x260 [ 34.797376] PGD 0 [ 34.799633] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.804582] Dumping ftrace buffer: [ 34.808094] (ftrace buffer empty) [ 34.811775] Modules linked in: [ 34.815059] CPU: 1 PID: 3746 Comm: syz-executor120 Not tainted 4.4.149-gf76bdbd #82 [ 34.822831] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.832178] task: ffff8800b08d8000 task.stack: ffff8801cc7b8000 [ 34.838218] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.846888] RSP: 0018:ffff8801cc7bf9c0 EFLAGS: 00010246 [ 34.852312] RAX: dffffc0000000000 RBX: ffffeafff8ba0000 RCX: 0000000000000000 [ 34.859557] RDX: 1ffffd5fff174001 RSI: ffffffff814bc8bf RDI: ffffeafff8ba0008 [ 34.866813] RBP: ffff8801cc7bf9d0 R08: ffffffff85333170 R09: 0000000000000000 [ 34.874058] R10: 0000000000000001 R11: ffff8800b08d8000 R12: 0000000000000001 [ 34.881311] R13: 1ffff100398f7f3e R14: ffff8801d1f97800 R15: ffffeafff8ba0000 [ 34.888558] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.896964] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.902819] CR2: ffffeafff8ba0008 CR3: 00000001d22dc000 CR4: 00000000001606f0 [ 34.910068] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.917314] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.924586] Stack: [ 34.926706] ffff8801cc7bfc50 0000000000000001 ffff8801cc7bfa78 ffffffff8150a443 [ 34.934684] 00003ffe2e8001e0 00003ffe2e8001e0 0000000041b58ab3 ffffffff841ef837 [ 34.942662] ffffffff8150a240 00000000000004f0 ffff8800b0b0f9a0 ffff8801cc7bfa40 [ 34.950650] Call Trace: [ 34.953212] [] zap_huge_pmd+0x203/0x510 [ 34.958810] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.965361] [] unmap_single_vma+0xea3/0x1240 [ 34.971393] [] ? vm_normal_page+0x230/0x230 [ 34.977340] [] ? __put_single_page+0x60/0x60 [ 34.983388] [] unmap_vmas+0x81/0xd0 [ 34.988640] [] exit_mmap+0x1c9/0x3a0 [ 34.994009] [] ? SyS_remap_file_pages+0x870/0x870 [ 35.000479] [] ? up_write+0x1a/0x60 [ 35.005731] [] mmput+0xf8/0x2d0 [ 35.010636] [] do_exit+0x8d8/0x26b0 [ 35.015888] [] ? file_map_prot_check+0x193/0x310 [ 35.022265] [] ? release_task.part.17+0x1200/0x1200 [ 35.028904] [] ? SyS_mprotect+0x41e/0x640 [ 35.034773] [] ? up_write+0x1a/0x60 [ 35.040021] [] ? SyS_mprotect+0x423/0x640 [ 35.045792] [] do_group_exit+0x111/0x330 [ 35.051478] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 35.057967] [] SyS_exit_group+0x1d/0x20 [ 35.063660] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 35.070229] 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 [ 35.097195] RIP [] page_remove_rmap+0x2e/0x260 [ 35.103539] RSP [ 35.107136] CR2: ffffeafff8ba0008 [ 35.110566] ---[ end trace c88d8aa347a962e9 ]--- [ 35.115292] Kernel panic - not syncing: Fatal exception [ 35.120982] Dumping ftrace buffer: [ 35.124501] (ftrace buffer empty) [ 35.128185] Kernel Offset: disabled [ 35.131784] Rebooting in 86400 seconds..