[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.022556] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.510882] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 23.839874] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 24.434616] random: sshd: uninitialized urandom read (32 bytes read, 53 bits of entropy available) [ 24.608720] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available) Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts. [ 30.111775] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) executing program [ 30.197688] BUG: unable to handle kernel paging request at ffffeafff8cd8008 [ 30.205039] IP: [] page_remove_rmap+0x2e/0x260 [ 30.211290] PGD 0 [ 30.213536] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.218487] Dumping ftrace buffer: [ 30.222042] (ftrace buffer empty) [ 30.225753] Modules linked in: [ 30.225761] CPU: 1 PID: 3700 Comm: syz-executor514 Not tainted 4.4.149-gf76bdbd #18 [ 30.225765] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.225769] task: ffff8800b2458000 task.stack: ffff8801ce3e0000 [ 30.225786] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 30.225789] RSP: 0018:ffff8801ce3e7948 EFLAGS: 00010246 [ 30.225793] RAX: dffffc0000000000 RBX: ffffeafff8cd8000 RCX: 0000000000000000 [ 30.225797] RDX: 1ffffd5fff19b001 RSI: ffffffff814bc8bf RDI: ffffeafff8cd8008 [ 30.225801] RBP: ffff8801ce3e7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 30.225804] R10: 0000000000000001 R11: ffff8800b2458000 R12: 0000000000000001 [ 30.225808] R13: 1ffff10039c7cf2f R14: ffff8801ce290800 R15: ffffeafff8cd8000 [ 30.225814] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.225818] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 30.225823] CR2: ffffeafff8cd8008 CR3: 00000001ce09d000 CR4: 00000000001606f0 [ 30.225830] Stack: [ 30.225839] ffff8801ce3e7bd8 0000000000000001 ffff8801ce3e7a00 ffffffff8150a443 [ 30.225848] 00003ffe336001e0 00003ffe336001e0 0000000041b58ab3 ffffffff841ef837 [ 30.225857] ffffffff8150a240 00000000000004f0 ffff8800b2de5dc0 ffff8801ce3e79c8 [ 30.225858] Call Trace: [ 30.225868] [] zap_huge_pmd+0x203/0x510 [ 30.225876] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 30.225898] [] unmap_single_vma+0xea3/0x1240 [ 30.225905] [] ? vm_normal_page+0x230/0x230 [ 30.225913] [] ? __put_single_page+0x60/0x60 [ 30.225919] [] unmap_vmas+0x81/0xd0 [ 30.225926] [] exit_mmap+0x1c9/0x3a0 [ 30.225933] [] ? SyS_remap_file_pages+0x870/0x870 [ 30.225941] [] ? up_write+0x1a/0x60 [ 30.225950] [] mmput+0xf8/0x2d0 [ 30.225957] [] do_exit+0x8d8/0x26b0 [ 30.225966] [] ? file_map_prot_check+0x193/0x310 [ 30.225973] [] ? release_task.part.17+0x1200/0x1200 [ 30.225980] [] ? SyS_mprotect+0x41e/0x640 [ 30.225987] [] ? up_write+0x1a/0x60 [ 30.226006] [] ? SyS_mprotect+0x423/0x640 [ 30.226012] [] do_group_exit+0x111/0x330 [ 30.226018] [] ? do_group_exit+0x330/0x330 [ 30.226024] [] SyS_exit_group+0x1d/0x20 [ 30.226032] [] do_fast_syscall_32+0x324/0x8b0 [ 30.226039] [] sysenter_flags_fixed+0xd/0x1a [ 30.226163] 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 [ 30.226171] RIP [] page_remove_rmap+0x2e/0x260 [ 30.226174] RSP [ 30.226176] CR2: ffffeafff8cd8008 [ 30.226181] ---[ end trace 0ed8db465c7a3b48 ]--- [ 30.226185] Kernel panic - not syncing: Fatal exception [ 30.229276] Dumping ftrace buffer: [ 30.229279] (ftrace buffer empty) [ 30.229281] Kernel Offset: disabled [ 30.526954] Rebooting in 86400 seconds..