[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.803439] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.603879] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 20.973348] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.720871] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 21.907076] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) Warning: Permanently added '10.128.0.25' (ECDSA) to the list of known hosts. [ 27.560130] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) executing program [ 27.647920] BUG: unable to handle kernel paging request at ffffeafffd3c8008 [ 27.655288] IP: [] page_remove_rmap+0x2e/0x260 [ 27.661554] PGD 0 [ 27.663837] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.668792] Dumping ftrace buffer: [ 27.672308] (ftrace buffer empty) [ 27.675994] Modules linked in: [ 27.679326] CPU: 1 PID: 3641 Comm: syz-executor105 Not tainted 4.4.149-gf76bdbd #18 [ 27.687091] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.696418] task: ffff8800b357b000 task.stack: ffff8800b3630000 [ 27.702464] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 27.711157] RSP: 0018:ffff8800b3637948 EFLAGS: 00010246 [ 27.716578] RAX: dffffc0000000000 RBX: ffffeafffd3c8000 RCX: 0000000000000000 [ 27.723827] RDX: 1ffffd5fffa79001 RSI: ffffffff814bc8bf RDI: ffffeafffd3c8008 [ 27.731071] RBP: ffff8800b3637958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 27.738319] R10: 0000000000000001 R11: ffff8800b357b000 R12: 0000000000000001 [ 27.745563] R13: 1ffff100166c6f2f R14: ffff8800b6f6d800 R15: ffffeafffd3c8000 [ 27.752811] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.761014] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.766872] CR2: ffffeafffd3c8008 CR3: 00000000b7120000 CR4: 00000000001606f0 [ 27.774121] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.781369] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.788629] Stack: [ 27.790752] ffff8800b3637bd8 0000000000000001 ffff8800b3637a00 ffffffff8150a443 [ 27.798800] 00003fff4f2001e0 00003fff4f2001e0 0000000041b58ab3 ffffffff841ef837 [ 27.806828] ffffffff8150a240 00000000000004f0 ffff8800b33e1840 ffff8800b36379c8 [ 27.814841] Call Trace: [ 27.817407] [] zap_huge_pmd+0x203/0x510 [ 27.823025] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 27.829581] [] unmap_single_vma+0xea3/0x1240 [ 27.835615] [] ? vm_normal_page+0x230/0x230 [ 27.841606] [] ? __put_single_page+0x60/0x60 [ 27.847641] [] unmap_vmas+0x81/0xd0 [ 27.852893] [] exit_mmap+0x1c9/0x3a0 [ 27.858243] [] ? SyS_remap_file_pages+0x870/0x870 [ 27.864711] [] ? kmem_cache_free+0x2b4/0x340 [ 27.870778] [] mmput+0xf8/0x2d0 [ 27.875688] [] do_exit+0x8d8/0x26b0 [ 27.880942] [] ? file_map_prot_check+0x193/0x310 [ 27.887327] [] ? release_task.part.17+0x1200/0x1200 [ 27.893987] [] ? SyS_mprotect+0x41e/0x640 [ 27.899764] [] ? up_write+0x1a/0x60 [ 27.905032] [] ? SyS_mprotect+0x423/0x640 [ 27.910807] [] do_group_exit+0x111/0x330 [ 27.916493] [] ? do_group_exit+0x330/0x330 [ 27.922379] [] SyS_exit_group+0x1d/0x20 [ 27.927980] [] do_fast_syscall_32+0x324/0x8b0 [ 27.934100] [] sysenter_flags_fixed+0xd/0x1a [ 27.940147] 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 [ 27.967310] RIP [] page_remove_rmap+0x2e/0x260 [ 27.973640] RSP [ 27.977237] CR2: ffffeafffd3c8008 [ 27.980670] ---[ end trace 798660be63e0f388 ]--- [ 27.985407] Kernel panic - not syncing: Fatal exception [ 27.991085] Dumping ftrace buffer: [ 27.994604] (ftrace buffer empty) [ 27.998290] Kernel Offset: disabled [ 28.001891] Rebooting in 86400 seconds..