[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.511397] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.504115] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 25.887711] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.681897] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) [ 26.835820] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. [ 32.624964] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) executing program [ 32.716608] BUG: unable to handle kernel paging request at ffffeafffd428008 [ 32.724066] IP: [] page_remove_rmap+0x2e/0x260 [ 32.730307] PGD 0 [ 32.732557] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.737521] Dumping ftrace buffer: [ 32.741047] (ftrace buffer empty) [ 32.744731] Modules linked in: [ 32.748038] CPU: 0 PID: 3847 Comm: syz-executor240 Not tainted 4.4.150-g5541782 #19 [ 32.756055] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.765422] task: ffff8801d9139800 task.stack: ffff8800bbbf0000 [ 32.771452] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.780151] RSP: 0018:ffff8800bbbf7948 EFLAGS: 00010246 [ 32.785589] RAX: dffffc0000000000 RBX: ffffeafffd428000 RCX: 0000000000000000 [ 32.792846] RDX: 1ffffd5fffa85001 RSI: ffffffff814bceaf RDI: ffffeafffd428008 [ 32.800115] RBP: ffff8800bbbf7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.807363] R10: 0000000000000001 R11: ffff8801d9139800 R12: 0000000000000001 [ 32.814608] R13: 1ffff1001777ef2f R14: ffff8800b37b4800 R15: ffffeafffd428000 [ 32.821853] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.830063] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.835918] CR2: ffffeafffd428008 CR3: 00000000b3484000 CR4: 00000000001606f0 [ 32.843163] Stack: [ 32.845288] ffff8800bbbf7bd8 0000000000000001 ffff8800bbbf7a00 ffffffff8150ad13 [ 32.853295] 00003fff50a001e0 00003fff50a001e0 0000000041b58ab3 ffffffff841ef837 [ 32.861313] ffffffff8150ab10 00000000000004f0 ffff8800b0248a50 ffff8800bbbf79c8 [ 32.869334] Call Trace: [ 32.871900] [] zap_huge_pmd+0x203/0x510 [ 32.877519] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.884080] [] unmap_single_vma+0xea3/0x1240 [ 32.890112] [] ? vm_normal_page+0x280/0x280 [ 32.896068] [] ? __put_single_page+0x60/0x60 [ 32.902106] [] unmap_vmas+0x81/0xd0 [ 32.907404] [] exit_mmap+0x1c9/0x3a0 [ 32.912752] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.919222] [] ? up_write+0x1a/0x60 [ 32.924472] [] mmput+0xf8/0x2d0 [ 32.929377] [] do_exit+0x8d8/0x26b0 [ 32.934629] [] ? file_map_prot_check+0x193/0x310 [ 32.941004] [] ? release_task.part.17+0x1200/0x1200 [ 32.947648] [] ? SyS_mprotect+0x41e/0x640 [ 32.953419] [] ? up_write+0x1a/0x60 [ 32.958671] [] ? SyS_mprotect+0x423/0x640 [ 32.964482] [] do_group_exit+0x111/0x330 [ 32.970168] [] ? do_group_exit+0x330/0x330 [ 32.976031] [] SyS_exit_group+0x1d/0x20 [ 32.981636] [] do_fast_syscall_32+0x324/0x8b0 [ 32.987758] [] sysenter_flags_fixed+0xd/0x1a [ 32.993789] 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 [ 33.020782] RIP [] page_remove_rmap+0x2e/0x260 [ 33.027135] RSP [ 33.030734] CR2: ffffeafffd428008 [ 33.034162] ---[ end trace 977da00a0ff09fee ]--- [ 33.038918] Kernel panic - not syncing: Fatal exception [ 33.044604] Dumping ftrace buffer: [ 33.048126] (ftrace buffer empty) [ 33.051809] Kernel Offset: disabled [ 33.055408] Rebooting in 86400 seconds..