[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.063228] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.955797] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.210693] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.907718] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) [ 25.083908] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.0.46' (ECDSA) to the list of known hosts. [ 30.596079] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program [ 30.682446] BUG: unable to handle kernel paging request at ffffeafffd348008 [ 30.689905] IP: [] page_remove_rmap+0x2e/0x260 [ 30.696153] PGD 0 [ 30.698389] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.703383] Dumping ftrace buffer: [ 30.706898] (ftrace buffer empty) [ 30.710602] Modules linked in: [ 30.713900] CPU: 1 PID: 3761 Comm: syz-executor838 Not tainted 4.4.150-g5541782 #83 [ 30.721666] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.730994] task: ffff8801d0619800 task.stack: ffff8801d2db0000 [ 30.737023] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 30.745705] RSP: 0018:ffff8801d2db79c0 EFLAGS: 00010246 [ 30.751130] RAX: dffffc0000000000 RBX: ffffeafffd348000 RCX: 0000000000000000 [ 30.758372] RDX: 1ffffd5fffa69001 RSI: ffffffff814bceaf RDI: ffffeafffd348008 [ 30.765653] RBP: ffff8801d2db79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 30.772966] R10: 0000000000000001 R11: ffff8801d0619800 R12: 0000000000000001 [ 30.780345] R13: 1ffff1003a5b6f3e R14: ffff8800b536d800 R15: ffffeafffd348000 [ 30.787609] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.795815] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.801730] CR2: ffffeafffd348008 CR3: 00000000b1ba8000 CR4: 00000000001606f0 [ 30.809029] Stack: [ 30.811156] ffff8801d2db7c50 0000000000000001 ffff8801d2db7a78 ffffffff8150ad13 [ 30.819198] 00003fff4d2001e0 00003fff4d2001e0 0000000041b58ab3 ffffffff841ef837 [ 30.827227] ffffffff8150ab10 00000000000004f0 ffff8800b020e898 ffff8801d2db7a40 [ 30.835207] Call Trace: [ 30.837773] [] zap_huge_pmd+0x203/0x510 [ 30.843387] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 30.849998] [] unmap_single_vma+0xea3/0x1240 [ 30.856045] [] ? vm_normal_page+0x280/0x280 [ 30.862000] [] ? __put_single_page+0x60/0x60 [ 30.868036] [] unmap_vmas+0x81/0xd0 [ 30.873291] [] exit_mmap+0x1c9/0x3a0 [ 30.878635] [] ? SyS_remap_file_pages+0x870/0x870 [ 30.885113] [] ? up_write+0x1a/0x60 [ 30.890408] [] mmput+0xf8/0x2d0 [ 30.895405] [] do_exit+0x8d8/0x26b0 [ 30.900657] [] ? file_map_prot_check+0x193/0x310 [ 30.907037] [] ? release_task.part.17+0x1200/0x1200 [ 30.913680] [] ? SyS_mprotect+0x41e/0x640 [ 30.919456] [] ? up_write+0x1a/0x60 [ 30.924712] [] ? SyS_mprotect+0x423/0x640 [ 30.930485] [] do_group_exit+0x111/0x330 [ 30.936198] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.942718] [] SyS_exit_group+0x1d/0x20 [ 30.948326] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 30.954936] 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 [ 30.981979] RIP [] page_remove_rmap+0x2e/0x260 [ 30.988311] RSP [ 30.991911] CR2: ffffeafffd348008 [ 30.995335] ---[ end trace d771ce5ebea0c1e4 ]--- [ 31.000062] Kernel panic - not syncing: Fatal exception [ 31.005827] Dumping ftrace buffer: [ 31.009351] (ftrace buffer empty) [ 31.013039] Kernel Offset: disabled [ 31.016642] Rebooting in 86400 seconds..