[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.841055] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.965586] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.271062] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.955070] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) [ 38.677328] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts. [ 44.441157] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) executing program [ 44.529277] BUG: unable to handle kernel paging request at ffffeafffd230008 [ 44.536620] IP: [] page_remove_rmap+0x2e/0x260 [ 44.542868] PGD 0 [ 44.545116] Oops: 0000 [#1] PREEMPT SMP KASAN [ 44.550060] Dumping ftrace buffer: [ 44.553572] (ftrace buffer empty) [ 44.557267] Modules linked in: [ 44.560561] CPU: 0 PID: 3695 Comm: syz-executor674 Not tainted 4.4.149-gf76bdbd #18 [ 44.568327] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.577656] task: ffff8801cf3ec800 task.stack: ffff8800b2b38000 [ 44.583750] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 44.592430] RSP: 0018:ffff8800b2b3f948 EFLAGS: 00010246 [ 44.597852] RAX: dffffc0000000000 RBX: ffffeafffd230000 RCX: ffffea0002dc8000 [ 44.605098] RDX: 1ffffd5fffa46001 RSI: ffffffff814bc8bf RDI: ffffeafffd230008 [ 44.612340] RBP: ffff8800b2b3f958 R08: ffffffff85333170 R09: 0000000000000000 [ 44.619585] R10: 0000000000000001 R11: ffff8801cf3ec800 R12: 0000000000000001 [ 44.626828] R13: 1ffff10016567f2f R14: ffff8800b4178810 R15: ffffeafffd230000 [ 44.634074] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 44.642275] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 44.648143] CR2: ffffeafffd230008 CR3: 00000000b2f11000 CR4: 00000000001606f0 [ 44.655389] Stack: [ 44.657510] ffff8800b2b3fbd8 0000000000000001 ffff8800b2b3fa00 ffffffff8150a443 [ 44.665507] 00003fff48c001a0 00003fff48c001a0 0000000041b58ab3 ffffffff841ef837 [ 44.673490] ffffffff8150a240 00000000000004f0 ffff8800b25d5738 ffff8800b2b3f9c8 [ 44.681488] Call Trace: [ 44.684066] [] zap_huge_pmd+0x203/0x510 [ 44.689718] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 44.696282] [] unmap_single_vma+0xea3/0x1240 [ 44.702367] [] ? vm_normal_page+0x230/0x230 [ 44.708319] [] ? __put_single_page+0x60/0x60 [ 44.714416] [] unmap_vmas+0x81/0xd0 [ 44.719676] [] exit_mmap+0x1c9/0x3a0 [ 44.725026] [] ? SyS_remap_file_pages+0x870/0x870 [ 44.731496] [] ? up_write+0x1a/0x60 [ 44.736791] [] mmput+0xf8/0x2d0 [ 44.741702] [] do_exit+0x8d8/0x26b0 [ 44.746957] [] ? file_map_prot_check+0x193/0x310 [ 44.753344] [] ? release_task.part.17+0x1200/0x1200 [ 44.760000] [] ? SyS_mprotect+0x41e/0x640 [ 44.765774] [] ? up_write+0x1a/0x60 [ 44.771204] [] ? SyS_mprotect+0x423/0x640 [ 44.776977] [] do_group_exit+0x111/0x330 [ 44.782659] [] ? do_group_exit+0x330/0x330 [ 44.788516] [] SyS_exit_group+0x1d/0x20 [ 44.794114] [] do_fast_syscall_32+0x324/0x8b0 [ 44.800230] [] sysenter_flags_fixed+0xd/0x1a [ 44.806254] 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 [ 44.833106] RIP [] page_remove_rmap+0x2e/0x260 [ 44.839434] RSP [ 44.843028] CR2: ffffeafffd230008 [ 44.846452] ---[ end trace 25050aeed3e3694b ]--- [ 44.851181] Kernel panic - not syncing: Fatal exception [ 44.856776] Dumping ftrace buffer: [ 44.860293] (ftrace buffer empty) [ 44.863977] Kernel Offset: disabled [ 44.867621] Rebooting in 86400 seconds..