[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.808945] 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: [ 26.055685] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 26.291339] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 26.910892] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) [ 27.081900] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.10.33' (ECDSA) to the list of known hosts. [ 32.874428] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) executing program [ 32.961336] BUG: unable to handle kernel paging request at ffffeafffd428008 [ 32.968694] IP: [] page_remove_rmap+0x2e/0x260 [ 32.974940] PGD 0 [ 32.977194] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.982151] Dumping ftrace buffer: [ 32.985664] (ftrace buffer empty) [ 32.989352] Modules linked in: [ 32.992636] CPU: 0 PID: 3849 Comm: syz-executor858 Not tainted 4.4.150-g5541782 #19 [ 33.000400] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.009729] task: ffff8801d92dc800 task.stack: ffff8800bb2e8000 [ 33.015755] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.024427] RSP: 0018:ffff8800bb2ef948 EFLAGS: 00010246 [ 33.029851] RAX: dffffc0000000000 RBX: ffffeafffd428000 RCX: 0000000000000000 [ 33.037095] RDX: 1ffffd5fffa85001 RSI: ffffffff814bceaf RDI: ffffeafffd428008 [ 33.044336] RBP: ffff8800bb2ef958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.051582] R10: 0000000000000001 R11: ffff8801d92dc800 R12: 0000000000000001 [ 33.058829] R13: 1ffff1001765df2f R14: ffff8800af1c7800 R15: ffffeafffd428000 [ 33.066076] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.074280] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.080150] CR2: ffffeafffd428008 CR3: 00000000b6680000 CR4: 00000000001606f0 [ 33.087395] Stack: [ 33.089516] ffff8800bb2efbd8 0000000000000001 ffff8800bb2efa00 ffffffff8150ad13 [ 33.097525] 00003fff50a001e0 00003fff50a001e0 0000000041b58ab3 ffffffff841ef837 [ 33.105531] ffffffff8150ab10 00000000000004f0 ffff8800acb0dc60 ffff8800bb2ef9c8 [ 33.113553] Call Trace: [ 33.116118] [] zap_huge_pmd+0x203/0x510 [ 33.121716] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.128297] [] unmap_single_vma+0xea3/0x1240 [ 33.134330] [] ? vm_normal_page+0x280/0x280 [ 33.140275] [] ? __put_single_page+0x60/0x60 [ 33.146307] [] unmap_vmas+0x81/0xd0 [ 33.151560] [] exit_mmap+0x1c9/0x3a0 [ 33.156897] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.163365] [] ? up_write+0x1a/0x60 [ 33.168614] [] mmput+0xf8/0x2d0 [ 33.173518] [] do_exit+0x8d8/0x26b0 [ 33.178789] [] ? file_map_prot_check+0x193/0x310 [ 33.185169] [] ? release_task.part.17+0x1200/0x1200 [ 33.191811] [] ? SyS_mprotect+0x41e/0x640 [ 33.197603] [] ? up_write+0x1a/0x60 [ 33.203115] [] ? SyS_mprotect+0x423/0x640 [ 33.208887] [] do_group_exit+0x111/0x330 [ 33.214594] [] ? do_group_exit+0x330/0x330 [ 33.222677] [] SyS_exit_group+0x1d/0x20 [ 33.229977] [] do_fast_syscall_32+0x324/0x8b0 [ 33.236101] [] sysenter_flags_fixed+0xd/0x1a [ 33.242130] 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 [ 33.269200] RIP [] page_remove_rmap+0x2e/0x260 [ 33.277032] RSP [ 33.280760] CR2: ffffeafffd428008 [ 33.284187] ---[ end trace 4adcea488e79e252 ]--- [ 33.288914] Kernel panic - not syncing: Fatal exception [ 33.294548] Dumping ftrace buffer: [ 33.298067] (ftrace buffer empty) [ 33.301758] Kernel Offset: disabled [ 33.305455] Rebooting in 86400 seconds..