[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.368268] 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: [ 29.622942] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 30.006535] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 30.632273] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) [ 30.811753] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. [ 36.317203] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) executing program [ 36.401770] BUG: unable to handle kernel paging request at ffffeafffd310008 [ 36.409170] IP: [] page_remove_rmap+0x2e/0x260 [ 36.415473] PGD 0 [ 36.417756] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.422742] Dumping ftrace buffer: [ 36.426265] (ftrace buffer empty) [ 36.429948] Modules linked in: [ 36.433286] CPU: 1 PID: 3790 Comm: syz-executor119 Not tainted 4.4.149-gf76bdbd #82 [ 36.441052] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.450393] task: ffff8800ae4f4800 task.stack: ffff8800ae960000 [ 36.456426] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 36.465102] RSP: 0018:ffff8800ae9679c0 EFLAGS: 00010246 [ 36.470542] RAX: dffffc0000000000 RBX: ffffeafffd310000 RCX: 0000000000000000 [ 36.477786] RDX: 1ffffd5fffa62001 RSI: ffffffff814bc8bf RDI: ffffeafffd310008 [ 36.485029] RBP: ffff8800ae9679d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 36.492281] R10: 0000000000000001 R11: ffff8800ae4f4800 R12: 0000000000000001 [ 36.499537] R13: 1ffff10015d2cf3e R14: ffff8800b49fa800 R15: ffffeafffd310000 [ 36.506783] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 36.514982] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.520838] CR2: ffffeafffd310008 CR3: 00000000b3deb000 CR4: 00000000001606f0 [ 36.528091] Stack: [ 36.530253] ffff8800ae967c50 0000000000000001 ffff8800ae967a78 ffffffff8150a443 [ 36.538273] 00003fff4c4001e0 00003fff4c4001e0 0000000041b58ab3 ffffffff841ef837 [ 36.546296] ffffffff8150a240 00000000000004f0 ffff8800b21e8b58 ffff8800ae967a40 [ 36.554293] Call Trace: [ 36.556883] [] zap_huge_pmd+0x203/0x510 [ 36.562493] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 36.569087] [] unmap_single_vma+0xea3/0x1240 [ 36.575144] [] ? vm_normal_page+0x230/0x230 [ 36.581093] [] ? __put_single_page+0x60/0x60 [ 36.587132] [] unmap_vmas+0x81/0xd0 [ 36.592408] [] exit_mmap+0x1c9/0x3a0 [ 36.597761] [] ? SyS_remap_file_pages+0x870/0x870 [ 36.604523] [] ? up_write+0x1a/0x60 [ 36.609794] [] mmput+0xf8/0x2d0 [ 36.614697] [] do_exit+0x8d8/0x26b0 [ 36.619966] [] ? file_map_prot_check+0x193/0x310 [ 36.626395] [] ? release_task.part.17+0x1200/0x1200 [ 36.633041] [] ? SyS_mprotect+0x41e/0x640 [ 36.638816] [] ? up_write+0x1a/0x60 [ 36.644074] [] ? SyS_mprotect+0x423/0x640 [ 36.649851] [] do_group_exit+0x111/0x330 [ 36.655551] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 36.662034] [] SyS_exit_group+0x1d/0x20 [ 36.667635] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 36.674186] 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 [ 36.701451] RIP [] page_remove_rmap+0x2e/0x260 [ 36.707815] RSP [ 36.711413] CR2: ffffeafffd310008 [ 36.714863] ---[ end trace 3e39ef4d77190880 ]--- [ 36.719772] Kernel panic - not syncing: Fatal exception [ 36.725431] Dumping ftrace buffer: [ 36.728954] (ftrace buffer empty) [ 36.732640] Kernel Offset: disabled [ 36.736244] Rebooting in 86400 seconds..