[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.120180] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.517027] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.771762] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.446508] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 25.635370] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) Warning: Permanently added '10.128.0.6' (ECDSA) to the list of known hosts. [ 31.142880] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) executing program [ 31.239812] BUG: unable to handle kernel paging request at ffffeafffd488008 [ 31.247304] IP: [] page_remove_rmap+0x2e/0x260 [ 31.254267] PGD 0 [ 31.256885] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.262380] Dumping ftrace buffer: [ 31.265918] (ftrace buffer empty) [ 31.269626] Modules linked in: [ 31.273263] CPU: 0 PID: 3791 Comm: syz-executor149 Not tainted 4.4.150-g5541782 #83 [ 31.281389] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.291193] task: ffff8800af974800 task.stack: ffff8800aefe0000 [ 31.297618] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.306621] RSP: 0018:ffff8800aefe79c0 EFLAGS: 00010246 [ 31.312063] RAX: dffffc0000000000 RBX: ffffeafffd488000 RCX: 0000000000000000 [ 31.319390] RDX: 1ffffd5fffa91001 RSI: ffffffff814bceaf RDI: ffffeafffd488008 [ 31.319395] RBP: ffff8800aefe79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.319399] R10: 0000000000000001 R11: ffff8800af974800 R12: 0000000000000001 [ 31.319402] R13: 1ffff10015dfcf3e R14: ffff8800b4891800 R15: ffffeafffd488000 [ 31.319408] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.319411] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.319415] CR2: ffffeafffd488008 CR3: 00000000b3f49000 CR4: 00000000001606f0 [ 31.319421] Stack: [ 31.319430] ffff8800aefe7c50 0000000000000001 ffff8800aefe7a78 ffffffff8150ad13 [ 31.319438] 00003fff522001e0 00003fff522001e0 0000000041b58ab3 ffffffff841ef837 [ 31.319446] ffffffff8150ab10 00000000000004f0 ffff8800b4aa9210 ffff8800aefe7a40 [ 31.319448] Call Trace: [ 31.319462] [] zap_huge_pmd+0x203/0x510 [ 31.319472] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.319480] [] unmap_single_vma+0xea3/0x1240 [ 31.319488] [] ? vm_normal_page+0x280/0x280 [ 31.319497] [] ? __put_single_page+0x60/0x60 [ 31.319504] [] unmap_vmas+0x81/0xd0 [ 31.319513] [] exit_mmap+0x1c9/0x3a0 [ 31.319521] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.319530] [] ? up_write+0x1a/0x60 [ 31.319538] [] mmput+0xf8/0x2d0 [ 31.319545] [] do_exit+0x8d8/0x26b0 [ 31.319555] [] ? file_map_prot_check+0x193/0x310 [ 31.319563] [] ? release_task.part.17+0x1200/0x1200 [ 31.319571] [] ? SyS_mprotect+0x41e/0x640 [ 31.319578] [] ? up_write+0x1a/0x60 [ 31.319586] [] ? SyS_mprotect+0x423/0x640 [ 31.319593] [] do_group_exit+0x111/0x330 [ 31.319601] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.319608] [] SyS_exit_group+0x1d/0x20 [ 31.319619] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.319734] 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 [ 31.319744] RIP [] page_remove_rmap+0x2e/0x260 [ 31.319746] RSP [ 31.319749] CR2: ffffeafffd488008 [ 31.319756] ---[ end trace 4b6891a56bfec982 ]--- [ 31.319760] Kernel panic - not syncing: Fatal exception [ 31.320576] Dumping ftrace buffer: [ 31.320580] (ftrace buffer empty) [ 31.320582] Kernel Offset: disabled [ 31.572790] Rebooting in 86400 seconds..