[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.232994] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 19.817290] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [ 20.108965] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.733686] random: sshd: uninitialized urandom read (32 bytes read, 46 bits of entropy available) [ 20.915819] random: sshd: uninitialized urandom read (32 bytes read, 50 bits of entropy available) Warning: Permanently added '10.128.15.199' (ECDSA) to the list of known hosts. [ 26.409339] random: sshd: uninitialized urandom read (32 bytes read, 57 bits of entropy available) executing program [ 26.492358] BUG: unable to handle kernel paging request at ffffeafff8cc0008 [ 26.499709] IP: [] page_remove_rmap+0x2e/0x260 [ 26.505953] PGD 0 [ 26.508192] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.513139] Dumping ftrace buffer: [ 26.516651] (ftrace buffer empty) [ 26.520337] Modules linked in: [ 26.523623] CPU: 1 PID: 3693 Comm: syz-executor775 Not tainted 4.4.148-gf057ff9 #81 [ 26.531392] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.540722] task: ffff8801cefe4800 task.stack: ffff8801ce098000 [ 26.546751] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 26.555430] RSP: 0018:ffff8801ce09f9c0 EFLAGS: 00010246 [ 26.560856] RAX: dffffc0000000000 RBX: ffffeafff8cc0000 RCX: ffffea0007338000 [ 26.568102] RDX: 1ffffd5fff198001 RSI: ffffffff814bc75f RDI: ffffeafff8cc0008 [ 26.575346] RBP: ffff8801ce09f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 26.582590] R10: 0000000000000001 R11: ffff8801cefe4800 R12: 0000000000000001 [ 26.589831] R13: 1ffff10039c13f3e R14: ffff8801d1874810 R15: ffffeafff8cc0000 [ 26.597078] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.605279] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.611150] CR2: ffffeafff8cc0008 CR3: 00000001cf7de000 CR4: 00000000001606f0 [ 26.618399] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.625644] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.632904] Stack: [ 26.635046] ffff8801ce09fc50 0000000000000001 ffff8801ce09fa78 ffffffff8150a1f3 [ 26.643045] 00003ffe330001a0 00003ffe330001a0 0000000041b58ab3 ffffffff841ef82f [ 26.651035] ffffffff81509ff0 00000000000004f0 ffff8800b2c3e528 ffff8801ce09fa40 [ 26.659041] Call Trace: [ 26.661608] [] zap_huge_pmd+0x203/0x510 [ 26.667223] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 26.673781] [] unmap_single_vma+0xea3/0x1240 [ 26.679812] [] ? vm_normal_page+0x230/0x230 [ 26.685760] [] ? __put_single_page+0x60/0x60 [ 26.691794] [] unmap_vmas+0x81/0xd0 [ 26.697064] [] exit_mmap+0x1c9/0x3a0 [ 26.702405] [] ? SyS_remap_file_pages+0x870/0x870 [ 26.708873] [] ? up_write+0x1a/0x60 [ 26.714124] [] mmput+0xf8/0x2d0 [ 26.719029] [] do_exit+0x8d8/0x26b0 [ 26.724283] [] ? file_map_prot_check+0x193/0x310 [ 26.730663] [] ? release_task.part.17+0x1200/0x1200 [ 26.737300] [] ? SyS_mprotect+0x41e/0x640 [ 26.743074] [] ? up_write+0x1a/0x60 [ 26.748325] [] ? SyS_mprotect+0x423/0x640 [ 26.754096] [] do_group_exit+0x111/0x330 [ 26.759777] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 26.766239] [] SyS_exit_group+0x1d/0x20 [ 26.771840] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 26.778389] 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 [ 26.805095] RIP [] page_remove_rmap+0x2e/0x260 [ 26.811424] RSP [ 26.815062] CR2: ffffeafff8cc0008 [ 26.818494] ---[ end trace 0782dce6fbdecfa1 ]--- [ 26.823220] Kernel panic - not syncing: Fatal exception [ 26.828912] Dumping ftrace buffer: [ 26.832430] (ftrace buffer empty) [ 26.836116] Kernel Offset: disabled [ 26.839714] Rebooting in 86400 seconds..