[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.612407] 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: [ 29.148190] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 29.605309] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 30.341822] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) [ 30.518593] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) Warning: Permanently added '10.128.0.54' (ECDSA) to the list of known hosts. [ 36.162674] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) executing program [ 36.255534] BUG: unable to handle kernel paging request at ffffeafff8d10008 [ 36.262928] IP: [] page_remove_rmap+0x2e/0x260 [ 36.269209] PGD 0 [ 36.271458] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.276422] Dumping ftrace buffer: [ 36.279941] (ftrace buffer empty) [ 36.283632] Modules linked in: [ 36.286979] CPU: 0 PID: 3854 Comm: syz-executor210 Not tainted 4.4.150-g5541782 #83 [ 36.294896] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.304233] task: ffff8801d9068000 task.stack: ffff8801d90f8000 [ 36.310269] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 36.318966] RSP: 0018:ffff8801d90ff9c0 EFLAGS: 00010246 [ 36.324393] RAX: dffffc0000000000 RBX: ffffeafff8d10000 RCX: 0000000000000000 [ 36.331648] RDX: 1ffffd5fff1a2001 RSI: ffffffff814bceaf RDI: ffffeafff8d10008 [ 36.338907] RBP: ffff8801d90ff9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 36.346163] R10: 0000000000000001 R11: ffff8801d9068000 R12: 0000000000000001 [ 36.353552] R13: 1ffff1003b21ff3e R14: ffff8801ca52d800 R15: ffffeafff8d10000 [ 36.360821] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 36.369039] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.374904] CR2: ffffeafff8d10008 CR3: 00000001ca5e0000 CR4: 00000000001606f0 [ 36.382161] Stack: [ 36.384288] ffff8801d90ffc50 0000000000000001 ffff8801d90ffa78 ffffffff8150ad13 [ 36.392288] 00003ffe344001e0 00003ffe344001e0 0000000041b58ab3 ffffffff841ef837 [ 36.400362] ffffffff8150ab10 00000000000004f0 ffff8801ca6c31b8 ffff8801d90ffa40 [ 36.408358] Call Trace: [ 36.410930] [] zap_huge_pmd+0x203/0x510 [ 36.416536] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 36.423098] [] unmap_single_vma+0xea3/0x1240 [ 36.429184] [] ? vm_normal_page+0x280/0x280 [ 36.435140] [] ? __put_single_page+0x60/0x60 [ 36.441258] [] unmap_vmas+0x81/0xd0 [ 36.446645] [] exit_mmap+0x1c9/0x3a0 [ 36.452011] [] ? SyS_remap_file_pages+0x870/0x870 [ 36.458503] [] ? kmem_cache_free+0x2b4/0x340 [ 36.464554] [] mmput+0xf8/0x2d0 [ 36.469570] [] do_exit+0x8d8/0x26b0 [ 36.474836] [] ? file_map_prot_check+0x193/0x310 [ 36.481226] [] ? release_task.part.17+0x1200/0x1200 [ 36.487874] [] ? SyS_mprotect+0x41e/0x640 [ 36.493649] [] ? up_write+0x1a/0x60 [ 36.498910] [] ? SyS_mprotect+0x423/0x640 [ 36.504689] [] do_group_exit+0x111/0x330 [ 36.510383] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 36.516915] [] SyS_exit_group+0x1d/0x20 [ 36.522528] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 36.529089] 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 [ 36.556483] RIP [] page_remove_rmap+0x2e/0x260 [ 36.562886] RSP [ 36.566488] CR2: ffffeafff8d10008 [ 36.569918] ---[ end trace 45206118421ca73f ]--- [ 36.574647] Kernel panic - not syncing: Fatal exception [ 36.580362] Dumping ftrace buffer: [ 36.583888] (ftrace buffer empty) [ 36.587579] Kernel Offset: disabled [ 36.591201] Rebooting in 86400 seconds..