[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.303644] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.409758] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.674047] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.310919] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) [ 25.488032] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) Warning: Permanently added '10.128.10.1' (ECDSA) to the list of known hosts. [ 31.246644] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) executing program [ 31.332169] BUG: unable to handle kernel paging request at ffffeafff8cb0008 [ 31.339661] IP: [] page_remove_rmap+0x2e/0x260 [ 31.345942] PGD 0 [ 31.348201] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.353209] Dumping ftrace buffer: [ 31.356728] (ftrace buffer empty) [ 31.360420] Modules linked in: [ 31.363724] CPU: 1 PID: 3841 Comm: syz-executor265 Not tainted 4.4.148-gf057ff9 #81 [ 31.371502] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.380840] task: ffff8801da3a4800 task.stack: ffff8800ac790000 [ 31.386879] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.395627] RSP: 0018:ffff8800ac7979c0 EFLAGS: 00010246 [ 31.401060] RAX: dffffc0000000000 RBX: ffffeafff8cb0000 RCX: 0000000000000000 [ 31.408313] RDX: 1ffffd5fff196001 RSI: ffffffff814bc75f RDI: ffffeafff8cb0008 [ 31.415566] RBP: ffff8800ac7979d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.422819] R10: 0000000000000001 R11: ffff8801da3a4800 R12: 0000000000000001 [ 31.430117] R13: 1ffff100158f2f3e R14: ffff8801c76df800 R15: ffffeafff8cb0000 [ 31.437371] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.445579] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.451444] CR2: ffffeafff8cb0008 CR3: 00000001c76e3000 CR4: 00000000001606f0 [ 31.458701] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.465958] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.473272] Stack: [ 31.475405] ffff8800ac797c50 0000000000000001 ffff8800ac797a78 ffffffff8150a1f3 [ 31.483436] 00003ffe32c001e0 00003ffe32c001e0 0000000041b58ab3 ffffffff841ef82f [ 31.491469] ffffffff81509ff0 00000000000004f0 ffff8800af088528 ffff8800ac797a40 [ 31.499545] Call Trace: [ 31.502120] [] zap_huge_pmd+0x203/0x510 [ 31.507729] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.514291] [] unmap_single_vma+0xea3/0x1240 [ 31.520331] [] ? vm_normal_page+0x230/0x230 [ 31.526286] [] ? __put_single_page+0x60/0x60 [ 31.532331] [] unmap_vmas+0x81/0xd0 [ 31.537594] [] exit_mmap+0x1c9/0x3a0 [ 31.542939] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.549415] [] ? up_write+0x1a/0x60 [ 31.554676] [] mmput+0xf8/0x2d0 [ 31.559588] [] do_exit+0x8d8/0x26b0 [ 31.564851] [] ? file_map_prot_check+0x193/0x310 [ 31.571240] [] ? release_task.part.17+0x1200/0x1200 [ 31.577896] [] ? SyS_mprotect+0x41e/0x640 [ 31.583677] [] ? up_write+0x1a/0x60 [ 31.588940] [] ? SyS_mprotect+0x423/0x640 [ 31.594724] [] do_group_exit+0x111/0x330 [ 31.600527] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.607109] [] SyS_exit_group+0x1d/0x20 [ 31.612719] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.619275] 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 [ 31.646931] RIP [] page_remove_rmap+0x2e/0x260 [ 31.653280] RSP [ 31.656892] CR2: ffffeafff8cb0008 [ 31.660329] ---[ end trace 7ed637cba228129f ]--- [ 31.665074] Kernel panic - not syncing: Fatal exception [ 31.670904] Dumping ftrace buffer: [ 31.674434] (ftrace buffer empty) [ 31.678131] Kernel Offset: disabled [ 31.681743] Rebooting in 86400 seconds..