[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.696164] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.392471] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.707233] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.352557] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) [ 22.524018] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) Warning: Permanently added '10.128.10.30' (ECDSA) to the list of known hosts. [ 28.079380] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) executing program [ 28.169179] BUG: unable to handle kernel paging request at ffffeafff8c00008 [ 28.176544] IP: [] page_remove_rmap+0x2e/0x260 [ 28.182808] PGD 0 [ 28.185050] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.189992] Dumping ftrace buffer: [ 28.193503] (ftrace buffer empty) [ 28.197200] Modules linked in: [ 28.200501] CPU: 1 PID: 3833 Comm: syz-executor691 Not tainted 4.4.150-g5541782 #19 [ 28.208269] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.217599] task: ffff8800bb141800 task.stack: ffff8801d9030000 [ 28.223649] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.232326] RSP: 0018:ffff8801d9037948 EFLAGS: 00010246 [ 28.237745] RAX: dffffc0000000000 RBX: ffffeafff8c00000 RCX: 0000000000000000 [ 28.244988] RDX: 1ffffd5fff180001 RSI: ffffffff814bceaf RDI: ffffeafff8c00008 [ 28.252234] RBP: ffff8801d9037958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.259479] R10: 0000000000000001 R11: ffff8800bb141800 R12: 0000000000000001 [ 28.266727] R13: 1ffff1003b206f2f R14: ffff8801ce166800 R15: ffffeafff8c00000 [ 28.273969] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.282166] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.288019] CR2: ffffeafff8c00008 CR3: 00000001ce0e8000 CR4: 00000000001606f0 [ 28.295265] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.302507] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.309747] Stack: [ 28.311868] ffff8801d9037bd8 0000000000000001 ffff8801d9037a00 ffffffff8150ad13 [ 28.319842] 00003ffe300001e0 00003ffe300001e0 0000000041b58ab3 ffffffff841ef837 [ 28.327822] ffffffff8150ab10 00000000000004f0 ffff8800b28bba50 ffff8801d90379c8 [ 28.335797] Call Trace: [ 28.338361] [] zap_huge_pmd+0x203/0x510 [ 28.343961] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.350536] [] unmap_single_vma+0xea3/0x1240 [ 28.356569] [] ? vm_normal_page+0x280/0x280 [ 28.362517] [] ? __put_single_page+0x60/0x60 [ 28.368548] [] unmap_vmas+0x81/0xd0 [ 28.373798] [] exit_mmap+0x1c9/0x3a0 [ 28.379829] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.386295] [] ? up_write+0x1a/0x60 [ 28.391561] [] mmput+0xf8/0x2d0 [ 28.396465] [] do_exit+0x8d8/0x26b0 [ 28.401716] [] ? file_map_prot_check+0x193/0x310 [ 28.408096] [] ? release_task.part.17+0x1200/0x1200 [ 28.414738] [] ? SyS_mprotect+0x41e/0x640 [ 28.420512] [] ? up_write+0x1a/0x60 [ 28.425763] [] ? SyS_mprotect+0x423/0x640 [ 28.431548] [] do_group_exit+0x111/0x330 [ 28.437231] [] ? do_group_exit+0x330/0x330 [ 28.443104] [] SyS_exit_group+0x1d/0x20 [ 28.448703] [] do_fast_syscall_32+0x324/0x8b0 [ 28.454837] [] sysenter_flags_fixed+0xd/0x1a [ 28.460864] 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 [ 28.487630] RIP [] page_remove_rmap+0x2e/0x260 [ 28.493957] RSP [ 28.497554] CR2: ffffeafff8c00008 [ 28.500981] ---[ end trace 25a4101c2da80ed9 ]--- [ 28.505704] Kernel panic - not syncing: Fatal exception [ 28.511390] Dumping ftrace buffer: [ 28.514926] (ftrace buffer empty) [ 28.518608] Kernel Offset: disabled [ 28.522211] Rebooting in 86400 seconds..