[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.966439] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 29.647576] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 30.264229] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 30.788776] random: sshd: uninitialized urandom read (32 bytes read, 49 bits of entropy available) [ 30.961299] random: sshd: uninitialized urandom read (32 bytes read, 51 bits of entropy available) Warning: Permanently added '10.128.0.24' (ECDSA) to the list of known hosts. [ 36.596888] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) executing program [ 36.695806] BUG: unable to handle kernel paging request at ffffeafff8bb0008 [ 36.703380] IP: [] page_remove_rmap+0x2e/0x260 [ 36.709633] PGD 0 [ 36.711884] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.716876] Dumping ftrace buffer: [ 36.720390] (ftrace buffer empty) [ 36.724145] Modules linked in: [ 36.727503] CPU: 1 PID: 3802 Comm: syz-executor086 Not tainted 4.4.150-g5541782 #19 [ 36.735322] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.744758] task: ffff8800af090000 task.stack: ffff8800b7b80000 [ 36.750795] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 36.759471] RSP: 0018:ffff8800b7b87948 EFLAGS: 00010246 [ 36.764900] RAX: dffffc0000000000 RBX: ffffeafff8bb0000 RCX: 0000000000000000 [ 36.772148] RDX: 1ffffd5fff176001 RSI: ffffffff814bceaf RDI: ffffeafff8bb0008 [ 36.779395] RBP: ffff8800b7b87958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 36.786642] R10: 0000000000000001 R11: ffff8800af090000 R12: 0000000000000001 [ 36.793891] R13: 1ffff10016f70f2f R14: ffff8801cafda800 R15: ffffeafff8bb0000 [ 36.801142] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 36.809348] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 36.815249] CR2: ffffeafff8bb0008 CR3: 00000001ca68d000 CR4: 00000000001606f0 [ 36.822504] Stack: [ 36.824627] ffff8800b7b87bd8 0000000000000001 ffff8800b7b87a00 ffffffff8150ad13 [ 36.832880] 00003ffe2ec001e0 00003ffe2ec001e0 0000000041b58ab3 ffffffff841ef837 [ 36.840873] ffffffff8150ab10 00000000000004f0 ffff8801ca1b5420 ffff8800b7b879c8 [ 36.848865] Call Trace: [ 36.851429] [] zap_huge_pmd+0x203/0x510 [ 36.857035] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 36.863601] [] unmap_single_vma+0xea3/0x1240 [ 36.869695] [] ? vm_normal_page+0x280/0x280 [ 36.875660] [] ? __put_single_page+0x60/0x60 [ 36.881702] [] unmap_vmas+0x81/0xd0 [ 36.886959] [] exit_mmap+0x1c9/0x3a0 [ 36.892301] [] ? SyS_remap_file_pages+0x870/0x870 [ 36.898772] [] ? up_write+0x1a/0x60 [ 36.904027] [] mmput+0xf8/0x2d0 [ 36.908931] [] do_exit+0x8d8/0x26b0 [ 36.914187] [] ? file_map_prot_check+0x193/0x310 [ 36.920578] [] ? release_task.part.17+0x1200/0x1200 [ 36.927222] [] ? SyS_mprotect+0x41e/0x640 [ 36.932996] [] ? up_write+0x1a/0x60 [ 36.938248] [] ? SyS_mprotect+0x423/0x640 [ 36.944019] [] do_group_exit+0x111/0x330 [ 36.949704] [] ? do_group_exit+0x330/0x330 [ 36.955572] [] SyS_exit_group+0x1d/0x20 [ 36.961227] [] do_fast_syscall_32+0x324/0x8b0 [ 36.967361] [] sysenter_flags_fixed+0xd/0x1a [ 36.973395] 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 [ 37.000547] RIP [] page_remove_rmap+0x2e/0x260 [ 37.006886] RSP [ 37.010488] CR2: ffffeafff8bb0008 [ 37.013918] ---[ end trace f19de3b80873856c ]--- [ 37.018646] Kernel panic - not syncing: Fatal exception [ 37.024286] Dumping ftrace buffer: [ 37.027809] (ftrace buffer empty) [ 37.031500] Kernel Offset: disabled [ 37.035103] Rebooting in 86400 seconds..