[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.583854] 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: [ 25.289797] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 25.713037] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 26.505442] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) [ 26.694184] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts. [ 32.230524] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) executing program [ 32.314547] BUG: unable to handle kernel paging request at ffffeafffd408008 [ 32.321955] IP: [] page_remove_rmap+0x2e/0x260 [ 32.328218] PGD 0 [ 32.330476] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.335473] Dumping ftrace buffer: [ 32.338994] (ftrace buffer empty) [ 32.342688] Modules linked in: [ 32.346114] CPU: 1 PID: 3834 Comm: syz-executor503 Not tainted 4.4.148-gf057ff9 #81 [ 32.353914] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.363256] task: ffff8801d94b3000 task.stack: ffff8800bb948000 [ 32.369368] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.378074] RSP: 0018:ffff8800bb94f9c0 EFLAGS: 00010246 [ 32.383574] RAX: dffffc0000000000 RBX: ffffeafffd408000 RCX: 0000000000000000 [ 32.390916] RDX: 1ffffd5fffa81001 RSI: ffffffff814bc75f RDI: ffffeafffd408008 [ 32.398181] RBP: ffff8800bb94f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.405447] R10: 0000000000000001 R11: ffff8801d94b3000 R12: 0000000000000001 [ 32.412702] R13: 1ffff10017729f3e R14: ffff8800b04bb800 R15: ffffeafffd408000 [ 32.419959] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.428359] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.434228] CR2: ffffeafffd408008 CR3: 00000000b060f000 CR4: 00000000001606f0 [ 32.441486] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.448739] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.456040] Stack: [ 32.458172] ffff8800bb94fc50 0000000000000001 ffff8800bb94fa78 ffffffff8150a1f3 [ 32.466231] 00003fff502001e0 00003fff502001e0 0000000041b58ab3 ffffffff841ef82f [ 32.474265] ffffffff81509ff0 00000000000004f0 ffff8800af532b58 ffff8800bb94fa40 [ 32.482307] Call Trace: [ 32.484882] [] zap_huge_pmd+0x203/0x510 [ 32.490513] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.497078] [] unmap_single_vma+0xea3/0x1240 [ 32.503122] [] ? vm_normal_page+0x230/0x230 [ 32.509079] [] ? __put_single_page+0x60/0x60 [ 32.515120] [] unmap_vmas+0x81/0xd0 [ 32.520384] [] exit_mmap+0x1c9/0x3a0 [ 32.525739] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.532218] [] ? up_write+0x1a/0x60 [ 32.537483] [] mmput+0xf8/0x2d0 [ 32.542400] [] do_exit+0x8d8/0x26b0 [ 32.547669] [] ? file_map_prot_check+0x193/0x310 [ 32.554194] [] ? release_task.part.17+0x1200/0x1200 [ 32.560847] [] ? SyS_mprotect+0x41e/0x640 [ 32.566630] [] ? up_write+0x1a/0x60 [ 32.571918] [] ? SyS_mprotect+0x423/0x640 [ 32.578011] [] do_group_exit+0x111/0x330 [ 32.583710] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.590395] [] SyS_exit_group+0x1d/0x20 [ 32.596015] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.602576] 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 [ 32.630295] RIP [] page_remove_rmap+0x2e/0x260 [ 32.636644] RSP [ 32.640259] CR2: ffffeafffd408008 [ 32.643696] ---[ end trace b158b50bb1b6afcb ]--- [ 32.648434] Kernel panic - not syncing: Fatal exception [ 32.654410] Dumping ftrace buffer: [ 32.658034] (ftrace buffer empty) [ 32.661728] Kernel Offset: disabled [ 32.672719] Rebooting in 86400 seconds..