[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.146413] 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: [ 25.827461] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.122671] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.719678] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) [ 30.803395] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 36.556101] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) executing program [ 36.649192] BUG: unable to handle kernel paging request at ffffeafffd390008 [ 36.656558] IP: [] page_remove_rmap+0x2e/0x260 [ 36.662817] PGD 0 [ 36.665083] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.670036] Dumping ftrace buffer: [ 36.673551] (ftrace buffer empty) [ 36.677238] Modules linked in: [ 36.680541] CPU: 1 PID: 3805 Comm: syz-executor525 Not tainted 4.4.150-g5541782 #19 [ 36.688308] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.697648] task: ffff8801d27c1800 task.stack: ffff8801d1c38000 [ 36.703811] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 36.712579] RSP: 0018:ffff8801d1c3f948 EFLAGS: 00010246 [ 36.718071] RAX: dffffc0000000000 RBX: ffffeafffd390000 RCX: ffffea0002dc0000 [ 36.725334] RDX: 1ffffd5fffa72001 RSI: ffffffff814bceaf RDI: ffffeafffd390008 [ 36.732579] RBP: ffff8801d1c3f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 36.739826] R10: 0000000000000001 R11: ffff8801d27c1800 R12: 0000000000000001 [ 36.747078] R13: 1ffff1003a387f2f R14: ffff8800af09d800 R15: ffffeafffd390000 [ 36.754330] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 36.762548] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 36.768433] CR2: ffffeafffd390008 CR3: 00000000af0b1000 CR4: 00000000001606f0 [ 36.775791] Stack: [ 36.777928] ffff8801d1c3fbd8 0000000000000001 ffff8801d1c3fa00 ffffffff8150ad13 [ 36.785927] 00003fff4e4001e0 00003fff4e4001e0 0000000041b58ab3 ffffffff841ef837 [ 36.793913] ffffffff8150ab10 00000000000004f0 ffff8801ca26b790 ffff8801d1c3f9c8 [ 36.801911] Call Trace: [ 36.804489] [] zap_huge_pmd+0x203/0x510 [ 36.810093] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 36.816650] [] unmap_single_vma+0xea3/0x1240 [ 36.822784] [] ? vm_normal_page+0x280/0x280 [ 36.828737] [] ? __put_single_page+0x60/0x60 [ 36.834859] [] unmap_vmas+0x81/0xd0 [ 36.840128] [] exit_mmap+0x1c9/0x3a0 [ 36.845581] [] ? SyS_remap_file_pages+0x870/0x870 [ 36.852166] [] ? up_write+0x1a/0x60 [ 36.857510] [] mmput+0xf8/0x2d0 [ 36.862414] [] do_exit+0x8d8/0x26b0 [ 36.867668] [] ? file_map_prot_check+0x193/0x310 [ 36.874143] [] ? release_task.part.17+0x1200/0x1200 [ 36.880798] [] ? SyS_mprotect+0x41e/0x640 [ 36.886576] [] ? up_write+0x1a/0x60 [ 36.891831] [] ? SyS_mprotect+0x423/0x640 [ 36.897654] [] do_group_exit+0x111/0x330 [ 36.903347] [] ? do_group_exit+0x330/0x330 [ 36.909301] [] SyS_exit_group+0x1d/0x20 [ 36.914909] [] do_fast_syscall_32+0x324/0x8b0 [ 36.921469] [] sysenter_flags_fixed+0xd/0x1a [ 36.927498] 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 [ 36.954659] RIP [] page_remove_rmap+0x2e/0x260 [ 36.960994] RSP [ 36.964598] CR2: ffffeafffd390008 [ 36.968041] ---[ end trace 25ca971d4b8c7aaa ]--- [ 36.972772] Kernel panic - not syncing: Fatal exception [ 36.978416] Dumping ftrace buffer: [ 36.981936] (ftrace buffer empty) [ 36.985623] Kernel Offset: disabled [ 36.989226] Rebooting in 86400 seconds..