[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.592855] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.885323] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.282344] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.881308] random: sshd: uninitialized urandom read (32 bytes read, 56 bits of entropy available) [ 26.050330] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 31.680201] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) executing program [ 31.766183] BUG: unable to handle kernel paging request at ffffeafff8cd8008 [ 31.773513] IP: [] page_remove_rmap+0x2e/0x260 [ 31.779764] PGD 0 [ 31.782008] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.786978] Dumping ftrace buffer: [ 31.790490] (ftrace buffer empty) [ 31.794175] Modules linked in: [ 31.797483] CPU: 0 PID: 3706 Comm: syz-executor889 Not tainted 4.4.149-gf76bdbd #18 [ 31.805261] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.814589] task: ffff8800b1d21800 task.stack: ffff8801cdc30000 [ 31.820626] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.829303] RSP: 0018:ffff8801cdc37948 EFLAGS: 00010246 [ 31.834727] RAX: dffffc0000000000 RBX: ffffeafff8cd8000 RCX: 0000000000000000 [ 31.841981] RDX: 1ffffd5fff19b001 RSI: ffffffff814bc8bf RDI: ffffeafff8cd8008 [ 31.849224] RBP: ffff8801cdc37958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.856483] R10: 0000000000000001 R11: ffff8800b1d21800 R12: 0000000000000001 [ 31.863727] R13: 1ffff10039b86f2f R14: ffff8801cdce4800 R15: ffffeafff8cd8000 [ 31.870978] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.879179] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.885034] CR2: ffffeafff8cd8008 CR3: 00000001cdc1a000 CR4: 00000000001606f0 [ 31.892277] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.899521] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.906764] Stack: [ 31.908887] ffff8801cdc37bd8 0000000000000001 ffff8801cdc37a00 ffffffff8150a443 [ 31.916940] 00003ffe336001e0 00003ffe336001e0 0000000041b58ab3 ffffffff841ef837 [ 31.924929] ffffffff8150a240 00000000000004f0 ffff8801d2783d68 ffff8801cdc379c8 [ 31.932907] Call Trace: [ 31.935538] [] zap_huge_pmd+0x203/0x510 [ 31.941144] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.947699] [] unmap_single_vma+0xea3/0x1240 [ 31.953736] [] ? vm_normal_page+0x230/0x230 [ 31.959682] [] ? __put_single_page+0x60/0x60 [ 31.965718] [] unmap_vmas+0x81/0xd0 [ 31.970967] [] exit_mmap+0x1c9/0x3a0 [ 31.976305] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.982772] [] ? up_write+0x1a/0x60 [ 31.988023] [] mmput+0xf8/0x2d0 [ 31.992924] [] do_exit+0x8d8/0x26b0 [ 31.998178] [] ? file_map_prot_check+0x193/0x310 [ 32.004558] [] ? release_task.part.17+0x1200/0x1200 [ 32.011203] [] ? SyS_mprotect+0x41e/0x640 [ 32.016977] [] ? up_write+0x1a/0x60 [ 32.022225] [] ? SyS_mprotect+0x423/0x640 [ 32.027998] [] do_group_exit+0x111/0x330 [ 32.033682] [] ? do_group_exit+0x330/0x330 [ 32.039543] [] SyS_exit_group+0x1d/0x20 [ 32.045146] [] do_fast_syscall_32+0x324/0x8b0 [ 32.051305] [] sysenter_flags_fixed+0xd/0x1a [ 32.057338] 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 [ 32.084315] RIP [] page_remove_rmap+0x2e/0x260 [ 32.090677] RSP [ 32.094274] CR2: ffffeafff8cd8008 [ 32.097702] ---[ end trace 9b972f962aa5dfc5 ]--- [ 32.102558] Kernel panic - not syncing: Fatal exception [ 32.108300] Dumping ftrace buffer: [ 32.111818] (ftrace buffer empty) [ 32.115501] Kernel Offset: disabled [ 32.119099] Rebooting in 86400 seconds..