[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.991566] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.155269] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 28.626751] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 29.312687] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) [ 29.489829] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) Warning: Permanently added '10.128.10.30' (ECDSA) to the list of known hosts. [ 35.049791] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) executing program [ 35.141617] hrtimer: interrupt took 26810 ns [ 35.147486] BUG: unable to handle kernel paging request at ffffeafff8d20008 [ 35.154806] IP: [] page_remove_rmap+0x2e/0x260 [ 35.161053] PGD 0 [ 35.163313] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.168270] Dumping ftrace buffer: [ 35.171782] (ftrace buffer empty) [ 35.175466] Modules linked in: [ 35.178751] CPU: 0 PID: 3851 Comm: syz-executor261 Not tainted 4.4.150-g5541782 #19 [ 35.186515] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.195843] task: ffff8801c86c8000 task.stack: ffff8801d9558000 [ 35.201894] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 35.210570] RSP: 0018:ffff8801d955f948 EFLAGS: 00010246 [ 35.215994] RAX: dffffc0000000000 RBX: ffffeafff8d20000 RCX: 0000000000000000 [ 35.223238] RDX: 1ffffd5fff1a4001 RSI: ffffffff814bceaf RDI: ffffeafff8d20008 [ 35.230481] RBP: ffff8801d955f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 35.237727] R10: 0000000000000001 R11: ffff8801c86c8000 R12: 0000000000000001 [ 35.244973] R13: 1ffff1003b2abf2f R14: ffff8801c7a77800 R15: ffffeafff8d20000 [ 35.252219] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.260453] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 35.266313] CR2: ffffeafff8d20008 CR3: 00000001cab7b000 CR4: 00000000001606f0 [ 35.273560] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.280812] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.288052] Stack: [ 35.290174] ffff8801d955fbd8 0000000000000001 ffff8801d955fa00 ffffffff8150ad13 [ 35.298163] 00003ffe348001e0 00003ffe348001e0 0000000041b58ab3 ffffffff841ef837 [ 35.306139] ffffffff8150ab10 00000000000004f0 ffff8801cabfd318 ffff8801d955f9c8 [ 35.314172] Call Trace: [ 35.316750] [] zap_huge_pmd+0x203/0x510 [ 35.322367] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 35.328936] [] unmap_single_vma+0xea3/0x1240 [ 35.334973] [] ? vm_normal_page+0x280/0x280 [ 35.340919] [] ? __put_single_page+0x60/0x60 [ 35.346955] [] unmap_vmas+0x81/0xd0 [ 35.352213] [] exit_mmap+0x1c9/0x3a0 [ 35.357551] [] ? SyS_remap_file_pages+0x870/0x870 [ 35.364021] [] ? up_write+0x1a/0x60 [ 35.369271] [] mmput+0xf8/0x2d0 [ 35.374192] [] do_exit+0x8d8/0x26b0 [ 35.379443] [] ? file_map_prot_check+0x193/0x310 [ 35.385822] [] ? release_task.part.17+0x1200/0x1200 [ 35.392464] [] ? SyS_mprotect+0x41e/0x640 [ 35.398237] [] ? up_write+0x1a/0x60 [ 35.403490] [] ? SyS_mprotect+0x423/0x640 [ 35.409262] [] do_group_exit+0x111/0x330 [ 35.414957] [] ? do_group_exit+0x330/0x330 [ 35.420898] [] SyS_exit_group+0x1d/0x20 [ 35.426514] [] do_fast_syscall_32+0x324/0x8b0 [ 35.433041] [] sysenter_flags_fixed+0xd/0x1a [ 35.439158] 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 [ 35.465925] RIP [] page_remove_rmap+0x2e/0x260 [ 35.472302] RSP [ 35.475908] CR2: ffffeafff8d20008 [ 35.479338] ---[ end trace 55913b7dfa063ecf ]--- [ 35.484091] Kernel panic - not syncing: Fatal exception [ 35.489891] Dumping ftrace buffer: [ 35.493414] (ftrace buffer empty) [ 35.497206] Kernel Offset: disabled [ 35.500807] Rebooting in 86400 seconds..