[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.253611] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.826006] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 22.120474] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.856142] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 23.022953] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. [ 28.628964] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program [ 28.714343] BUG: unable to handle kernel paging request at ffffeafff8bd0008 [ 28.721687] IP: [] page_remove_rmap+0x2e/0x260 [ 28.727933] PGD 0 [ 28.730175] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.735114] Dumping ftrace buffer: [ 28.738625] (ftrace buffer empty) [ 28.742308] Modules linked in: [ 28.745591] CPU: 1 PID: 3802 Comm: syz-executor739 Not tainted 4.4.150-g5541782 #83 [ 28.753379] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.762713] task: ffff8801cae53000 task.stack: ffff8801ca7d0000 [ 28.768738] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.777420] RSP: 0018:ffff8801ca7d79c0 EFLAGS: 00010246 [ 28.782842] RAX: dffffc0000000000 RBX: ffffeafff8bd0000 RCX: 0000000000000000 [ 28.790086] RDX: 1ffffd5fff17a001 RSI: ffffffff814bceaf RDI: ffffeafff8bd0008 [ 28.797330] RBP: ffff8801ca7d79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.804575] R10: 0000000000000001 R11: ffff8801cae53000 R12: 0000000000000001 [ 28.811817] R13: 1ffff100394faf3e R14: ffff8801d19a5800 R15: ffffeafff8bd0000 [ 28.819080] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.827289] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.833146] CR2: ffffeafff8bd0008 CR3: 00000001d19df000 CR4: 00000000001606f0 [ 28.840389] Stack: [ 28.842511] ffff8801ca7d7c50 0000000000000001 ffff8801ca7d7a78 ffffffff8150ad13 [ 28.850496] 00003ffe2f4001e0 00003ffe2f4001e0 0000000041b58ab3 ffffffff841ef837 [ 28.858486] ffffffff8150ab10 00000000000004f0 ffff8801d301f6e0 ffff8801ca7d7a40 [ 28.866469] Call Trace: [ 28.869033] [] zap_huge_pmd+0x203/0x510 [ 28.874632] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.881184] [] unmap_single_vma+0xea3/0x1240 [ 28.887219] [] ? vm_normal_page+0x280/0x280 [ 28.893163] [] ? __put_single_page+0x60/0x60 [ 28.899193] [] unmap_vmas+0x81/0xd0 [ 28.904444] [] exit_mmap+0x1c9/0x3a0 [ 28.909792] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.916275] [] ? up_write+0x1a/0x60 [ 28.921547] [] mmput+0xf8/0x2d0 [ 28.926469] [] do_exit+0x8d8/0x26b0 [ 28.931720] [] ? file_map_prot_check+0x193/0x310 [ 28.938096] [] ? release_task.part.17+0x1200/0x1200 [ 28.944748] [] ? SyS_mprotect+0x41e/0x640 [ 28.950516] [] ? up_write+0x1a/0x60 [ 28.955765] [] ? SyS_mprotect+0x423/0x640 [ 28.961542] [] do_group_exit+0x111/0x330 [ 28.967245] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.973708] [] SyS_exit_group+0x1d/0x20 [ 28.979305] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 28.985853] Code: e5 41 54 53 48 89 fb e8 31 76 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 03 76 e9 ff f0 83 43 18 ff 78 [ 29.012629] RIP [] page_remove_rmap+0x2e/0x260 [ 29.018992] RSP [ 29.022588] CR2: ffffeafff8bd0008 [ 29.026016] ---[ end trace 41005c0adbe45580 ]--- [ 29.031045] Kernel panic - not syncing: Fatal exception [ 29.036694] Dumping ftrace buffer: [ 29.040216] (ftrace buffer empty) [ 29.043901] Kernel Offset: disabled [ 29.047502] Rebooting in 86400 seconds..