[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.331171] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 30.248305] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 30.793002] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 31.531506] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 31.741786] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) Warning: Permanently added '10.128.0.6' (ECDSA) to the list of known hosts. [ 37.220556] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) executing program [ 37.311119] BUG: unable to handle kernel paging request at ffffeafffd388008 [ 37.318510] IP: [] page_remove_rmap+0x2e/0x260 [ 37.324763] PGD 0 [ 37.327005] Oops: 0000 [#1] PREEMPT SMP KASAN [ 37.331947] Dumping ftrace buffer: [ 37.335457] (ftrace buffer empty) [ 37.339149] Modules linked in: [ 37.342452] CPU: 1 PID: 3818 Comm: syz-executor383 Not tainted 4.4.149-gf76bdbd #18 [ 37.350305] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.359644] task: ffff8801d2c99800 task.stack: ffff8800b7228000 [ 37.365679] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 37.374361] RSP: 0018:ffff8800b722f948 EFLAGS: 00010246 [ 37.379785] RAX: dffffc0000000000 RBX: ffffeafffd388000 RCX: 0000000000000000 [ 37.387027] RDX: 1ffffd5fffa71001 RSI: ffffffff814bc8bf RDI: ffffeafffd388008 [ 37.394269] RBP: ffff8800b722f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 37.401513] R10: 0000000000000001 R11: ffff8801d2c99800 R12: 0000000000000001 [ 37.408756] R13: 1ffff10016e45f2f R14: ffff8800ae67a800 R15: ffffeafffd388000 [ 37.416001] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 37.424297] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 37.430222] CR2: ffffeafffd388008 CR3: 00000000b5e03000 CR4: 00000000001606f0 [ 37.437486] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.444843] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.452292] Stack: [ 37.454414] ffff8800b722fbd8 0000000000000001 ffff8800b722fa00 ffffffff8150a443 [ 37.462400] 00003fff4e2001e0 00003fff4e2001e0 0000000041b58ab3 ffffffff841ef837 [ 37.470398] ffffffff8150a240 00000000000004f0 ffff8800aebee318 ffff8800b722f9c8 [ 37.478506] Call Trace: [ 37.481078] [] zap_huge_pmd+0x203/0x510 [ 37.486676] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 37.493234] [] unmap_single_vma+0xea3/0x1240 [ 37.499270] [] ? vm_normal_page+0x230/0x230 [ 37.505215] [] ? __put_single_page+0x60/0x60 [ 37.511248] [] unmap_vmas+0x81/0xd0 [ 37.516499] [] exit_mmap+0x1c9/0x3a0 [ 37.521838] [] ? SyS_remap_file_pages+0x870/0x870 [ 37.528303] [] ? up_write+0x1a/0x60 [ 37.533558] [] mmput+0xf8/0x2d0 [ 37.538468] [] do_exit+0x8d8/0x26b0 [ 37.543733] [] ? file_map_prot_check+0x193/0x310 [ 37.550113] [] ? release_task.part.17+0x1200/0x1200 [ 37.556756] [] ? SyS_mprotect+0x41e/0x640 [ 37.562529] [] ? up_write+0x1a/0x60 [ 37.567778] [] ? SyS_mprotect+0x423/0x640 [ 37.573552] [] do_group_exit+0x111/0x330 [ 37.579235] [] ? do_group_exit+0x330/0x330 [ 37.585100] [] SyS_exit_group+0x1d/0x20 [ 37.590806] [] do_fast_syscall_32+0x324/0x8b0 [ 37.596926] [] sysenter_flags_fixed+0xd/0x1a [ 37.602952] Code: e5 41 54 53 48 89 fb e8 e1 77 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 b3 77 e9 ff f0 83 43 18 ff 78 [ 37.630200] RIP [] page_remove_rmap+0x2e/0x260 [ 37.636543] RSP [ 37.640140] CR2: ffffeafffd388008 [ 37.643569] ---[ end trace e9ebd28455a84a01 ]--- [ 37.648300] Kernel panic - not syncing: Fatal exception [ 37.654120] Dumping ftrace buffer: [ 37.657652] (ftrace buffer empty) [ 37.661339] Kernel Offset: disabled [ 37.664940] Rebooting in 86400 seconds..