[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.383498] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.838704] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 27.255475] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 27.968732] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 28.129906] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. [ 33.891741] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) executing program [ 33.986179] BUG: unable to handle kernel paging request at ffffeafff8d10008 [ 33.993541] IP: [] page_remove_rmap+0x2e/0x260 [ 33.999850] PGD 0 [ 34.002093] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.007064] Dumping ftrace buffer: [ 34.010594] (ftrace buffer empty) [ 34.014282] Modules linked in: [ 34.017568] CPU: 0 PID: 3845 Comm: syz-executor496 Not tainted 4.4.150-g5541782 #19 [ 34.025337] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.034695] task: ffff8800b5f63000 task.stack: ffff8801c6f70000 [ 34.040836] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.049524] RSP: 0018:ffff8801c6f77948 EFLAGS: 00010246 [ 34.054948] RAX: dffffc0000000000 RBX: ffffeafff8d10000 RCX: 0000000000000000 [ 34.062208] RDX: 1ffffd5fff1a2001 RSI: ffffffff814bceaf RDI: ffffeafff8d10008 [ 34.069455] RBP: ffff8801c6f77958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 34.076701] R10: 0000000000000001 R11: ffff8800b5f63000 R12: 0000000000000001 [ 34.083946] R13: 1ffff10038deef2f R14: ffff8801c7b58800 R15: ffffeafff8d10000 [ 34.091213] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.099424] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 34.105284] CR2: ffffeafff8d10008 CR3: 00000001d1b27000 CR4: 00000000001606f0 [ 34.112532] Stack: [ 34.114660] ffff8801c6f77bd8 0000000000000001 ffff8801c6f77a00 ffffffff8150ad13 [ 34.122646] 00003ffe344001e0 00003ffe344001e0 0000000041b58ab3 ffffffff841ef837 [ 34.130635] ffffffff8150ab10 00000000000004f0 ffff8801d23a3b58 ffff8801c6f779c8 [ 34.138618] Call Trace: [ 34.141185] [] zap_huge_pmd+0x203/0x510 [ 34.146786] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.153344] [] unmap_single_vma+0xea3/0x1240 [ 34.159377] [] ? vm_normal_page+0x280/0x280 [ 34.165323] [] ? __put_single_page+0x60/0x60 [ 34.171374] [] unmap_vmas+0x81/0xd0 [ 34.176631] [] exit_mmap+0x1c9/0x3a0 [ 34.181970] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.188439] [] ? up_write+0x1a/0x60 [ 34.193691] [] mmput+0xf8/0x2d0 [ 34.198598] [] do_exit+0x8d8/0x26b0 [ 34.203855] [] ? file_map_prot_check+0x193/0x310 [ 34.210237] [] ? release_task.part.17+0x1200/0x1200 [ 34.216883] [] ? SyS_mprotect+0x41e/0x640 [ 34.222655] [] ? up_write+0x1a/0x60 [ 34.228086] [] ? SyS_mprotect+0x423/0x640 [ 34.233883] [] do_group_exit+0x111/0x330 [ 34.239578] [] ? do_group_exit+0x330/0x330 [ 34.245456] [] SyS_exit_group+0x1d/0x20 [ 34.251077] [] do_fast_syscall_32+0x324/0x8b0 [ 34.257200] [] sysenter_flags_fixed+0xd/0x1a [ 34.263255] 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 [ 34.290321] RIP [] page_remove_rmap+0x2e/0x260 [ 34.296688] RSP [ 34.300295] CR2: ffffeafff8d10008 [ 34.303726] ---[ end trace 89adff4aded63066 ]--- [ 34.308457] Kernel panic - not syncing: Fatal exception [ 34.314085] Dumping ftrace buffer: [ 34.317606] (ftrace buffer empty) [ 34.321293] Kernel Offset: disabled [ 34.324912] Rebooting in 86400 seconds..