[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.172827] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.237052] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.569849] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 27.384973] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) [ 27.568263] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) Warning: Permanently added '10.128.10.54' (ECDSA) to the list of known hosts. [ 33.215156] random: sshd: uninitialized urandom read (32 bytes read, 91 bits of entropy available) executing program [ 33.306650] BUG: unable to handle kernel paging request at ffffeafff8d08008 [ 33.314005] IP: [] page_remove_rmap+0x2e/0x260 [ 33.320255] PGD 0 [ 33.322496] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.327479] Dumping ftrace buffer: [ 33.330993] (ftrace buffer empty) [ 33.334679] Modules linked in: [ 33.337985] CPU: 0 PID: 3850 Comm: syz-executor640 Not tainted 4.4.150-g5541782 #83 [ 33.345751] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.355080] task: ffff8800abdac800 task.stack: ffff8800ac870000 [ 33.361110] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.369792] RSP: 0018:ffff8800ac8779c0 EFLAGS: 00010246 [ 33.375213] RAX: dffffc0000000000 RBX: ffffeafff8d08000 RCX: ffffea0007510000 [ 33.382473] RDX: 1ffffd5fff1a1001 RSI: ffffffff814bceaf RDI: ffffeafff8d08008 [ 33.389732] RBP: ffff8800ac8779d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.396979] R10: 0000000000000001 R11: ffff8800abdac800 R12: 0000000000000001 [ 33.404225] R13: 1ffff1001590ef3e R14: ffff8801d8c05800 R15: ffffeafff8d08000 [ 33.411470] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.419671] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.428726] CR2: ffffeafff8d08008 CR3: 00000000b50a1000 CR4: 00000000001606f0 [ 33.436324] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.443862] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.451240] Stack: [ 33.453363] ffff8800ac877c50 0000000000000001 ffff8800ac877a78 ffffffff8150ad13 [ 33.461386] 00003ffe342001e0 00003ffe342001e0 0000000041b58ab3 ffffffff841ef837 [ 33.469378] ffffffff8150ab10 00000000000004f0 ffff8800bba16738 ffff8800ac877a40 [ 33.477406] Call Trace: [ 33.479976] [] zap_huge_pmd+0x203/0x510 [ 33.485586] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.492157] [] unmap_single_vma+0xea3/0x1240 [ 33.498191] [] ? vm_normal_page+0x280/0x280 [ 33.504139] [] ? __put_single_page+0x60/0x60 [ 33.510192] [] unmap_vmas+0x81/0xd0 [ 33.515468] [] exit_mmap+0x1c9/0x3a0 [ 33.520807] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.527283] [] ? up_write+0x1a/0x60 [ 33.532546] [] mmput+0xf8/0x2d0 [ 33.537479] [] do_exit+0x8d8/0x26b0 [ 33.542736] [] ? file_map_prot_check+0x193/0x310 [ 33.549114] [] ? release_task.part.17+0x1200/0x1200 [ 33.555783] [] ? SyS_mprotect+0x41e/0x640 [ 33.561561] [] ? up_write+0x1a/0x60 [ 33.566812] [] ? SyS_mprotect+0x423/0x640 [ 33.572593] [] do_group_exit+0x111/0x330 [ 33.578279] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.584767] [] SyS_exit_group+0x1d/0x20 [ 33.590388] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.596944] 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 [ 33.623893] RIP [] page_remove_rmap+0x2e/0x260 [ 33.630226] RSP [ 33.633825] CR2: ffffeafff8d08008 [ 33.637252] ---[ end trace afb6323458a0b728 ]--- [ 33.641982] Kernel panic - not syncing: Fatal exception [ 33.647833] Dumping ftrace buffer: [ 33.651418] (ftrace buffer empty) [ 33.655120] Kernel Offset: disabled [ 33.658725] Rebooting in 86400 seconds..