[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.243958] 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: [ 26.233596] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.582964] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.175188] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) [ 30.827840] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) Warning: Permanently added '10.128.10.29' (ECDSA) to the list of known hosts. [ 36.387936] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) executing program [ 36.471022] BUG: unable to handle kernel paging request at ffffeafff8d08008 [ 36.478370] IP: [] page_remove_rmap+0x2e/0x260 [ 36.484616] PGD 0 [ 36.486858] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.491804] Dumping ftrace buffer: [ 36.495322] (ftrace buffer empty) [ 36.499004] Modules linked in: [ 36.502353] CPU: 0 PID: 3851 Comm: syz-executor603 Not tainted 4.4.148-gf057ff9 #81 [ 36.510119] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.519458] task: ffff8801c6a24800 task.stack: ffff8801d8db8000 [ 36.525505] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 36.534201] RSP: 0018:ffff8801d8dbf9c0 EFLAGS: 00010246 [ 36.539626] RAX: dffffc0000000000 RBX: ffffeafff8d08000 RCX: 0000000000000000 [ 36.546869] RDX: 1ffffd5fff1a1001 RSI: ffffffff814bc75f RDI: ffffeafff8d08008 [ 36.554115] RBP: ffff8801d8dbf9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 36.561359] R10: 0000000000000001 R11: ffff8801c6a24800 R12: 0000000000000001 [ 36.568602] R13: 1ffff1003b1b7f3e R14: ffff8801ca068800 R15: ffffeafff8d08000 [ 36.575846] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 36.584047] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.589905] CR2: ffffeafff8d08008 CR3: 00000001c8169000 CR4: 00000000001606f0 [ 36.597149] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.604392] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.611634] Stack: [ 36.613755] ffff8801d8dbfc50 0000000000000001 ffff8801d8dbfa78 ffffffff8150a1f3 [ 36.621732] 00003ffe342001e0 00003ffe342001e0 0000000041b58ab3 ffffffff841ef82f [ 36.629718] ffffffff81509ff0 00000000000004f0 ffff8801cce27318 ffff8801d8dbfa40 [ 36.637692] Call Trace: [ 36.640261] [] zap_huge_pmd+0x203/0x510 [ 36.645860] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 36.652415] [] unmap_single_vma+0xea3/0x1240 [ 36.658447] [] ? vm_normal_page+0x230/0x230 [ 36.664393] [] ? __put_single_page+0x60/0x60 [ 36.670429] [] unmap_vmas+0x81/0xd0 [ 36.675679] [] exit_mmap+0x1c9/0x3a0 [ 36.681018] [] ? SyS_remap_file_pages+0x870/0x870 [ 36.687483] [] ? up_write+0x1a/0x60 [ 36.692735] [] mmput+0xf8/0x2d0 [ 36.697638] [] do_exit+0x8d8/0x26b0 [ 36.702891] [] ? file_map_prot_check+0x193/0x310 [ 36.709271] [] ? release_task.part.17+0x1200/0x1200 [ 36.715912] [] ? SyS_mprotect+0x41e/0x640 [ 36.721686] [] ? up_write+0x1a/0x60 [ 36.726938] [] ? SyS_mprotect+0x423/0x640 [ 36.732795] [] do_group_exit+0x111/0x330 [ 36.738487] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 36.744957] [] SyS_exit_group+0x1d/0x20 [ 36.750564] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 36.757182] 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 [ 36.784088] RIP [] page_remove_rmap+0x2e/0x260 [ 36.790428] RSP [ 36.794025] CR2: ffffeafff8d08008 [ 36.797451] ---[ end trace 76a66f714691a8c7 ]--- [ 36.802183] Kernel panic - not syncing: Fatal exception [ 36.807910] Dumping ftrace buffer: [ 36.811438] (ftrace buffer empty) [ 36.815129] Kernel Offset: disabled [ 36.818726] Rebooting in 86400 seconds..