[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.189677] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.055352] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.307476] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.966020] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) [ 26.156706] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) Warning: Permanently added '10.128.10.44' (ECDSA) to the list of known hosts. [ 31.702313] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) executing program [ 31.787025] BUG: unable to handle kernel paging request at ffffeafff8d08008 [ 31.794380] IP: [] page_remove_rmap+0x2e/0x260 [ 31.800655] PGD 0 [ 31.802903] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.807889] Dumping ftrace buffer: [ 31.811404] (ftrace buffer empty) [ 31.815090] Modules linked in: [ 31.818376] CPU: 0 PID: 3841 Comm: syz-executor623 Not tainted 4.4.148-gf057ff9 #81 [ 31.826143] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.835476] task: ffff8800bba6e000 task.stack: ffff8801d42e0000 [ 31.841511] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.850194] RSP: 0018:ffff8801d42e79c0 EFLAGS: 00010246 [ 31.855621] RAX: dffffc0000000000 RBX: ffffeafff8d08000 RCX: 0000000000000000 [ 31.862867] RDX: 1ffffd5fff1a1001 RSI: ffffffff814bc75f RDI: ffffeafff8d08008 [ 31.870117] RBP: ffff8801d42e79d0 R08: ffffffff85302320 R09: 0000000000000000 [ 31.877382] R10: 0000000000000001 R11: ffff8800bba6e000 R12: 0000000000000001 [ 31.884633] R13: 1ffff1003a85cf3e R14: ffff8801cb7d9800 R15: ffffeafff8d08000 [ 31.891903] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.900112] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.905971] CR2: ffffeafff8d08008 CR3: 00000001d95fd000 CR4: 00000000001606f0 [ 31.913219] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.920488] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.927744] Stack: [ 31.929878] ffff8801d42e7c50 0000000000000001 ffff8801d42e7a78 ffffffff8150a1f3 [ 31.937865] 00003ffe342001e0 00003ffe342001e0 0000000041b58ab3 ffffffff841ef82f [ 31.945858] ffffffff81509ff0 00000000000004f0 ffff8801ca64a528 ffff8801d42e7a40 [ 31.953868] Call Trace: [ 31.956542] [] zap_huge_pmd+0x203/0x510 [ 31.962144] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.968719] [] unmap_single_vma+0xea3/0x1240 [ 31.974784] [] ? vm_normal_page+0x230/0x230 [ 31.980733] [] ? __put_single_page+0x60/0x60 [ 31.986957] [] unmap_vmas+0x81/0xd0 [ 31.992221] [] exit_mmap+0x1c9/0x3a0 [ 31.997572] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.004045] [] ? up_write+0x1a/0x60 [ 32.009302] [] mmput+0xf8/0x2d0 [ 32.014208] [] do_exit+0x8d8/0x26b0 [ 32.019464] [] ? file_map_prot_check+0x193/0x310 [ 32.025866] [] ? release_task.part.17+0x1200/0x1200 [ 32.032515] [] ? SyS_mprotect+0x41e/0x640 [ 32.038292] [] ? up_write+0x1a/0x60 [ 32.043555] [] ? SyS_mprotect+0x423/0x640 [ 32.049335] [] do_group_exit+0x111/0x330 [ 32.055023] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.061498] [] SyS_exit_group+0x1d/0x20 [ 32.067127] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.073680] 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 [ 32.100551] RIP [] page_remove_rmap+0x2e/0x260 [ 32.106888] RSP [ 32.110489] CR2: ffffeafff8d08008 [ 32.113923] ---[ end trace 05981e52208e8cef ]--- [ 32.118655] Kernel panic - not syncing: Fatal exception [ 32.124428] Dumping ftrace buffer: [ 32.127962] (ftrace buffer empty) [ 32.131654] Kernel Offset: disabled [ 32.135261] Rebooting in 86400 seconds..